1
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Li Y, Liu Q, Wu S, Geng L, Popovic J, Li Y, Chen Z, Wang H, Wang Y, Dai T, Yang Y, Sun H, Lu Y, Zhang L, Tang Y, Xiao R, Li H, Chen L, Maier J, Huang J, Hu YS. Unraveling the Reaction Mystery of Li and Na with Dry Air. J Am Chem Soc 2023; 145:10576-10583. [PMID: 37130260 DOI: 10.1021/jacs.2c13589] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Li and Na metals with high energy density are promising in application in rechargeable batteries but suffer from degradation in the ambient atmosphere. The phenomenon that in terms of kinetics, Li is stable but Na is unstable in dry air has not been fully understood. Here, we use in situ environmental transmission electron microscopy combined with theoretical simulations and reveal that the different stabilities in dry air for Li and Na are reflected by the formation of compact Li2O layers on Li metal, while porous and rough Na2O/Na2O2 layers on Na metal are a consequence of the different thermodynamic and kinetics in O2. It is shown that a preformed carbonate layer can change the kinetics of Na toward an anticorrosive behavior. Our study provides a deeper understanding of the often-overlooked chemical reactions with environmental gases and enhances the electrochemical performance of Li and Na by controlling interfacial stability.
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Affiliation(s)
- Yuqi Li
- Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qiunan Liu
- Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
| | - Siyuan Wu
- Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lin Geng
- Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
| | - Jelena Popovic
- Physical Chemistry of Solids, Max Planck Institute for Solid State Research, Heisenbergstr. 1, Stuttgart 70569, Germany
| | - Yu Li
- Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
- Huairou Division, Institute of Physics, Chinese Academy of Sciences, Beijing 101400, China
| | - Zhao Chen
- Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Haibo Wang
- Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Yuqi Wang
- Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tao Dai
- Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Yang Yang
- Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Haiming Sun
- Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
| | - Yaxiang Lu
- Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Huairou Division, Institute of Physics, Chinese Academy of Sciences, Beijing 101400, China
- Yangtze River Delta Physics Research Center, Liyang, Jiangsu 213300, China
| | - Liqiang Zhang
- Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
| | - Yongfu Tang
- Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
| | - Ruijuan Xiao
- Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Yangtze River Delta Physics Research Center, Liyang, Jiangsu 213300, China
| | - Hong Li
- Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
- Huairou Division, Institute of Physics, Chinese Academy of Sciences, Beijing 101400, China
- Yangtze River Delta Physics Research Center, Liyang, Jiangsu 213300, China
| | - Liquan Chen
- Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Joachim Maier
- Physical Chemistry of Solids, Max Planck Institute for Solid State Research, Heisenbergstr. 1, Stuttgart 70569, Germany
| | - Jianyu Huang
- Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China
| | - Yong-Sheng Hu
- Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
- Huairou Division, Institute of Physics, Chinese Academy of Sciences, Beijing 101400, China
- Yangtze River Delta Physics Research Center, Liyang, Jiangsu 213300, China
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2
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Schweiger L, Hogrefe K, Gadermaier B, Rupp JLM, Wilkening HMR. Ionic Conductivity of Nanocrystalline and Amorphous Li 10GeP 2S 12: The Detrimental Impact of Local Disorder on Ion Transport. J Am Chem Soc 2022; 144:9597-9609. [PMID: 35608382 PMCID: PMC9185751 DOI: 10.1021/jacs.1c13477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Solids with extraordinarily
high Li+ dynamics are key
for high performance all-solid-state batteries. The thiophosphate
Li10GeP2S12 (LGPS) belongs to the
best Li-ion conductors with an ionic conductivity exceeding 10 mS
cm–1 at ambient temperature. Recent molecular dynamics
simulations performed by Dawson and Islam predict that the ionic conductivity
of LGPS can be further enhanced by a factor of 3 if local disorder
is introduced. As yet, no experimental evidence exists supporting
this fascinating prediction. Here, we synthesized nanocrystalline
LGPS by high-energy ball-milling and probed the Li+ ion
transport parameters. Broadband conductivity spectroscopy in combination
with electric modulus measurements allowed us to precisely follow
the changes in Li+ dynamics. Surprisingly and against the
behavior of other electrolytes, bulk ionic conductivity turned out
to decrease with increasing milling time, finally leading to a reduction
of σ20°C by a factor of 10. 31P, 6Li NMR, and X-ray diffraction showed that ball-milling forms
a structurally heterogeneous sample with nm-sized LGPS crystallites
and amorphous material. At −135 °C, electrical relaxation
in the amorphous regions is by 2 to 3 orders of magnitude slower.
Careful separation of the amorphous and (nano)crystalline contributions
to overall ion transport revealed that in both regions, Li+ ion dynamics is slowed down compared to untreated LGPS. Hence, introducing
defects into the LGPS bulk structure via ball-milling
has a negative impact on ionic transport. We postulate that such a
kind of structural disorder is detrimental to fast ion transport in
materials whose transport properties rely on crystallographically
well-defined diffusion pathways.
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Affiliation(s)
- Lukas Schweiger
- Institute of Chemistry and Technology of Materials, Christian Doppler Laboratory for Lithium Batteries, Graz University of Technology (NAWI Graz), Graz 8010, Austria
| | - Katharina Hogrefe
- Institute of Chemistry and Technology of Materials, Christian Doppler Laboratory for Lithium Batteries, Graz University of Technology (NAWI Graz), Graz 8010, Austria
| | - Bernhard Gadermaier
- Institute of Chemistry and Technology of Materials, Christian Doppler Laboratory for Lithium Batteries, Graz University of Technology (NAWI Graz), Graz 8010, Austria
| | - Jennifer L M Rupp
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.,Electrochemical Materials, Department of Electrical Engineering & Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - H Martin R Wilkening
- Institute of Chemistry and Technology of Materials, Christian Doppler Laboratory for Lithium Batteries, Graz University of Technology (NAWI Graz), Graz 8010, Austria
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3
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Lithium ion transport in micro- and nanocrystalline lithium sulphide Li 2S. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2022. [DOI: 10.1515/znb-2022-0013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Abstract
Ion dynamics in binary Li-bearing compounds such as LiF, Li2O and Li2S is rather poor. These compounds do, however, form as decomposition products at the interface between the electrolyte and the electrode materials in lithium-based batteries. They are expected to severely influence the charge transport across this electrode-electrolyte interface and, thus, the overall performance of such systems. Yet, ion dynamics in the nanostructured forms of these binary compounds has scarcely been investigated. Here, we prepared bulk nanostructured Li2S through high-energy ball milling and studied its temperature-dependent ionic conductivity by means of broadband impedance spectroscopy. It turned out that, compared to the unmilled form, Li+ ion conductivity in ball-milled Li2S increased by approximately 3 orders or magnitude. This striking increase is accompanied by a decrease of the average activation energy from ca. 0.9 eV to approximately 0.7 eV. Structural disorder, stress and local distortions are assumed to be responsible for this clear change in macroscopic transport parameters. Fast ion dynamics in or near the interfacial space charge zones might contribute to enhanced dynamics, too. We conclude that Li ion transport in interfacial Li2S, if present in a disordered nanostructured form in lithium-ion batteries, is much faster than originally thought for its ordered counterpart.
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4
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Stanje B, Wilkening HMR. Extremely Fast Interfacial Li Ion Dynamics in Crystalline LiTFSI Combined with EMIM-TFSI. ACS PHYSICAL CHEMISTRY AU 2021; 2:136-142. [PMID: 36855508 PMCID: PMC9718315 DOI: 10.1021/acsphyschemau.1c00032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Materials providing fast transport pathways for ionic charge carriers are at the heart of future all-solid state batteries that completely rely on sustainable, nonflammable solid electrolytes. The mobile ions in fast ion conductors may take benefit from structural disorder, cation and anion substitution, or dimensionality effects. While these effects concern the bulk regions of a given material, one may also manipulate the surface or interfacial regions of a polycrystalline poorly conducting electrolyte to enhance its transport properties. Here, we used 7Li NMR to characterize interfacial effects in crystalline lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) to which a small amount of ionic liquid EMIM-TFSI (EMIM: 1-ethyl-3-methylimidazolium cation, C6H11N2 +) was added. We recorded longitudinal spin-lattice relaxation (SLR) curves M z (t d) that directly mirror the 7Li spin-fluctuations controlled by motional processes in such ionic-liquids-in-salt composites. Already at room temperature we observe strongly bimodal buildup curves M z (t d) leading to two distinct SLR rates differing by a factor of 100. While the slower rate does exactly reflect the temperature behavior expected for poorly conducting LiTFSI, the faster rate mirrors rapid motional processes that are governed by an activation energy as low as 73 meV. We attribute these fast processes to highly mobile Li+ ions in or near the contact area of crystalline LiTFSI and EMIM-TFSI. By using a method that characterizes motional processes from the atomic-scale point of view, we emphasize the importance of interfacial regions as reservoirs for fast Li+ ions in such solid composite electrolytes.
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5
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Gombotz M, Hogrefe K, Zettl R, Gadermaier B, Wilkening HMR. Fuzzy logic: about the origins of fast ion dynamics in crystalline solids. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2021; 379:20200434. [PMID: 34628947 PMCID: PMC8503637 DOI: 10.1098/rsta.2020.0434] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/07/2021] [Indexed: 05/27/2023]
Abstract
Nuclear magnetic resonance offers a wide range of tools to analyse ionic jump processes in crystalline and amorphous solids. Both high-resolution and time-domain [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] NMR helps throw light on the origins of rapid self-diffusion in materials being relevant for energy storage. It is well accepted that [Formula: see text] ions are subjected to extremely slow exchange processes in compounds with strong site preferences. The loss of this site preference may lead to rapid cation diffusion, as is also well known for glassy materials. Further examples that benefit from this effect include, e.g. cation-mixed, high-entropy fluorides [Formula: see text], Li-bearing garnets ([Formula: see text]) and thiophosphates such as [Formula: see text]. In non-equilibrium phases site disorder, polyhedra distortions, strain and the various types of defects will affect both the activation energy and the corresponding attempt frequencies. Whereas in [Formula: see text] ([Formula: see text]) cation mixing influences F anion dynamics, in [Formula: see text] ([Formula: see text]) the potential landscape can be manipulated by anion site disorder. On the other hand, in the mixed conductor [Formula: see text] cation-cation repulsions immediately lead to a boost in [Formula: see text] diffusivity at the early stages of chemical lithiation. Finally, rapid diffusion is also expected for materials that are able to guide the ions along (macroscopic) pathways with confined (or low-dimensional) dimensions, as is the case in layer-structured [Formula: see text] or [Formula: see text]. Diffusion on fractal systems complements this type of diffusion. This article is part of the Theo Murphy meeting issue 'Understanding fast-ion conduction in solid electrolytes'.
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Affiliation(s)
- M. Gombotz
- Institute for Chemistry and Technology of Materials, Christian Doppler Laboratory for Lithium Batteries, Graz University of Technology (NAWI Graz), Stremayrgasse, 9, 8010 Graz, Austria
| | - K. Hogrefe
- Institute for Chemistry and Technology of Materials, Christian Doppler Laboratory for Lithium Batteries, Graz University of Technology (NAWI Graz), Stremayrgasse, 9, 8010 Graz, Austria
| | - R. Zettl
- Institute for Chemistry and Technology of Materials, Christian Doppler Laboratory for Lithium Batteries, Graz University of Technology (NAWI Graz), Stremayrgasse, 9, 8010 Graz, Austria
| | - B. Gadermaier
- Institute for Chemistry and Technology of Materials, Christian Doppler Laboratory for Lithium Batteries, Graz University of Technology (NAWI Graz), Stremayrgasse, 9, 8010 Graz, Austria
| | - H. Martin. R. Wilkening
- Institute for Chemistry and Technology of Materials, Christian Doppler Laboratory for Lithium Batteries, Graz University of Technology (NAWI Graz), Stremayrgasse, 9, 8010 Graz, Austria
- ALISTORE – European Research Institute, CNRS FR3104, Hub de l’Energie, Rue Baudelocque, 80039 Amiens, France
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6
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Gombotz M, Hogrefe K, Wilkening A, Gadermaier B, Wilkening M. F anion transport in nanocrystalline SmF3 and in mechanosynthesized, vacancy-rich Sm1—x
BaxF3—x. Z PHYS CHEM 2021. [DOI: 10.1515/zpch-2021-3092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Nanostructured materials can show considerably different properties as compared to their coarse-grained counterparts. Especially prepared by high-energy ball milling they are to be characterized by a large fraction of point defects in the bulk and structurally disordered interfacial regions. Here, we explored how the overall conductivity of SmF3 can be enhanced by mechanical treatment and to which degree aliovalent substitution is able to further enhance anion transport. For this purpose nanocrystalline (hexagonal) SmF3 was prepared by high-energy ball milling; mechanosynthesis helped us to replace Sm3+ in SmF3 by Ba2+ and to create vacancies in the F anion sublattice. We observed a remarkable increase in total (direct current) conductivity when going from nano-SmF3 to Sm1−x
Ba
x
F3−x
for x = 0.1. Electrical modulus spectroscopy was used to further characterize the corresponding increase in electrical relaxation frequencies.
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Affiliation(s)
- Maria Gombotz
- Institute of Chemistry and Technology of Materials, Graz University of Technology , Stremayrgasse 9, 8010 , Graz , Austria
| | - Katharina Hogrefe
- Institute of Chemistry and Technology of Materials, Graz University of Technology , Stremayrgasse 9, 8010 , Graz , Austria
| | - Alexandra Wilkening
- Institute of Chemistry and Technology of Materials, Graz University of Technology , Stremayrgasse 9, 8010 , Graz , Austria
| | - Bernhard Gadermaier
- Institute of Chemistry and Technology of Materials, Graz University of Technology , Stremayrgasse 9, 8010 , Graz , Austria
| | - Martin Wilkening
- Institute of Chemistry and Technology of Materials, Graz University of Technology , Stremayrgasse 9, 8010 , Graz , Austria
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7
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Gadermaier B, Hogrefe K, Heitjans P, Wilkening HMR. Broadband impedance spectroscopy of Li
4
Ti
5
O
12
: from nearly constant loss effects to long‐range ion dynamics. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Bernhard Gadermaier
- Institute for Chemistry and Technology of Materials Graz University of Technology Stremayrgasse 9 8010 Graz Austria
| | - Katharina Hogrefe
- Institute for Chemistry and Technology of Materials Graz University of Technology Stremayrgasse 9 8010 Graz Austria
| | - Paul Heitjans
- Institute of Physical Chemistry and Electrochemistry Leibniz Universität Hannover Callinstraße 3–3a 30167 Hannover Germany
| | - H. Martin R. Wilkening
- Institute for Chemistry and Technology of Materials Graz University of Technology Stremayrgasse 9 8010 Graz Austria
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8
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Hogrefe K, Minafra N, Zeier WG, Wilkening HMR. Tracking Ions the Direct Way: Long-Range Li + Dynamics in the Thio-LISICON Family Li 4MCh 4 (M = Sn, Ge; Ch = S, Se) as Probed by 7Li NMR Relaxometry and 7Li Spin-Alignment Echo NMR. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:2306-2317. [PMID: 33584937 PMCID: PMC7876753 DOI: 10.1021/acs.jpcc.0c10224] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 01/13/2021] [Indexed: 05/03/2023]
Abstract
Solid electrolytes are key elements for next-generation energy storage systems. To design powerful electrolytes with high ionic conductivity, we need to improve our understanding of the mechanisms that are at the heart of the rapid ion exchange processes in solids. Such an understanding also requires evaluation and testing of methods not routinely used to characterize ion conductors. Here, the ternary Li4MCh4 system (M = Ge, Sn; Ch = Se, S) provides model compounds to study the applicability of 7Li nuclear magnetic resonance (NMR) spin-alignment echo (SAE) spectroscopy to probe slow Li+ exchange processes. Whereas the exact interpretation of conventional spin-lattice relaxation data depends on models, SAE NMR offers a model-independent, direct access to motional correlation rates. Indeed, the jump rates and activation energies deduced from time-domain relaxometry data perfectly agree with results from 7Li SAE NMR. In particular, long-range Li+ diffusion in polycrystalline Li4SnS4 as seen by NMR in a dynamic range covering 6 orders of magnitude is determined by an activation energy of E a = 0.55 eV and a pre-exponential factor of 3 × 1013 s-1. The variation in E a and 1/τ0 is related to the LiCh4 volume that changes within the four Li4MCh4 compounds studied. The corresponding volume of Li4SnS4 seems to be close to optimum for Li+ diffusivity.
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Affiliation(s)
- Katharina Hogrefe
- Institute
of Chemistry and Technology of Materials, Graz University of Technology (NAWI Graz), Stremayrgasse 9, A-8010 Graz, Austria
| | - Nicolò Minafra
- Institute
of Inorganic and Analytical Chemistry, University
of Münster, Correnstrasse
30, D-48149 Münster, Germany
| | - Wolfgang G. Zeier
- Institute
of Inorganic and Analytical Chemistry, University
of Münster, Correnstrasse
30, D-48149 Münster, Germany
| | - H. Martin R. Wilkening
- Institute
of Chemistry and Technology of Materials, Graz University of Technology (NAWI Graz), Stremayrgasse 9, A-8010 Graz, Austria
- Email
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9
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Zettl R, Gombotz M, Clarkson D, Greenbaum SG, Ngene P, de Jongh PE, Wilkening HMR. Li-Ion Diffusion in Nanoconfined LiBH 4-LiI/Al 2O 3: From 2D Bulk Transport to 3D Long-Range Interfacial Dynamics. ACS APPLIED MATERIALS & INTERFACES 2020; 12:38570-38583. [PMID: 32786241 PMCID: PMC7453398 DOI: 10.1021/acsami.0c10361] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Solid electrolytes based on LiBH4 receive much attention because of their high ionic conductivity, electrochemical robustness, and low interfacial resistance against Li metal. The highly conductive hexagonal modification of LiBH4 can be stabilized via the incorporation of LiI. If the resulting LiBH4-LiI is confined to the nanopores of an oxide, such as Al2O3, interface-engineered LiBH4-LiI/Al2O3 is obtained that revealed promising properties as a solid electrolyte. The underlying principles of Li+ conduction in such a nanocomposite are, however, far from being understood completely. Here, we used broadband conductivity spectroscopy and 1H, 6Li, 7Li, 11B, and 27Al nuclear magnetic resonance (NMR) to study structural and dynamic features of nanoconfined LiBH4-LiI/Al2O3. In particular, diffusion-induced 1H, 7Li, and 11B NMR spin-lattice relaxation measurements and 7Li-pulsed field gradient (PFG) NMR experiments were used to extract activation energies and diffusion coefficients. 27Al magic angle spinning NMR revealed surface interactions of LiBH4-LiI with pentacoordinated Al sites, and two-component 1H NMR line shapes clearly revealed heterogeneous dynamic processes. These results show that interfacial regions have a determining influence on overall ionic transport (0.1 mS cm-1 at 293 K). Importantly, electrical relaxation in the LiBH4-LiI regions turned out to be fully homogenous. This view is supported by 7Li NMR results, which can be interpreted with an overall (averaged) spin ensemble subjected to uniform dipolar magnetic and quadrupolar electric interactions. Finally, broadband conductivity spectroscopy gives strong evidence for 2D ionic transport in the LiBH4-LiI bulk regions which we observed over a dynamic range of 8 orders of magnitude. Macroscopic diffusion coefficients from PFG NMR agree with those estimated from measurements of ionic conductivity and nuclear spin relaxation. The resulting 3D ionic transport in nanoconfined LiBH4-LiI/Al2O3 is characterized by an activation energy of 0.43 eV.
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Affiliation(s)
- Roman Zettl
- Institute
for Chemistry and Technology of Materials, and Christian Doppler Laboratory
for Lithium Batteries, Graz University of
Technology, Stremayrgasse 9, Graz 8010, Austria
- Inorganic
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitweg 99, Utrecht 3584, Netherlands
| | - Maria Gombotz
- Institute
for Chemistry and Technology of Materials, and Christian Doppler Laboratory
for Lithium Batteries, Graz University of
Technology, Stremayrgasse 9, Graz 8010, Austria
| | - David Clarkson
- Department
of Physics and Astronomy, Hunter College
of the City University of New York, New York 10065, New York, United States
| | - Steven G. Greenbaum
- Department
of Physics and Astronomy, Hunter College
of the City University of New York, New York 10065, New York, United States
| | - Peter Ngene
- Inorganic
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitweg 99, Utrecht 3584, Netherlands
| | - Petra E. de Jongh
- Inorganic
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitweg 99, Utrecht 3584, Netherlands
| | - H. Martin R. Wilkening
- Institute
for Chemistry and Technology of Materials, and Christian Doppler Laboratory
for Lithium Batteries, Graz University of
Technology, Stremayrgasse 9, Graz 8010, Austria
- Alistore−ERI
European Research Institute, CNRS FR3104, Hub de l’Energie, Rue Baudelocque, F-80039 Amiens, France
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10
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Brinek M, Hiebl C, Wilkening HMR. Understanding the Origin of Enhanced Li-Ion Transport in Nanocrystalline Argyrodite-Type Li 6PS 5I. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2020; 32:4754-4766. [PMID: 32565618 PMCID: PMC7304077 DOI: 10.1021/acs.chemmater.0c01367] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 05/18/2020] [Indexed: 05/05/2023]
Abstract
Argyrodite-type Li6PS5X (X = Cl, Br) compounds are considered to act as powerful ionic conductors in next-generation all-solid-state lithium batteries. In contrast to Li6PS5Br and Li6PS5Cl compounds showing ionic conductivities on the order of several mS cm-1, the iodine compound Li6PS5I turned out to be a poor ionic conductor. This difference has been explained by anion site disorder in Li6PS5Br and Li6PS5Cl leading to facile through-going, that is, long-range ion transport. In the structurally ordered compound, Li6PS5I, long-range ion transport is, however, interrupted because the important intercage Li jump-diffusion pathway, enabling the ions to diffuse over long distances, is characterized by higher activation energy than that in the sibling compounds. Here, we introduced structural disorder in the iodide by soft mechanical treatment and took advantage of a high-energy planetary mill to prepare nanocrystalline Li6PS5I. A milling time of only 120 min turned out to be sufficient to boost ionic conductivity by 2 orders of magnitude, reaching σtotal = 0.5 × 10-3 S cm-1. We followed this noticeable increase in ionic conductivity by broad-band conductivity spectroscopy and 7Li nuclear magnetic relaxation. X-ray powder diffraction and high-resolution 6Li, 31P MAS NMR helped characterize structural changes and the extent of disorder introduced. Changes in attempt frequency, activation entropy, and charge carrier concentration seem to be responsible for this increase.
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11
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Gombotz M, Lunghammer S, Breuer S, Hanzu I, Preishuber-Pflügl F, Wilkening HMR. Spatial confinement – rapid 2D F− diffusion in micro- and nanocrystalline RbSn2F5. Phys Chem Chem Phys 2019; 21:1872-1883. [PMID: 30632556 DOI: 10.1039/c8cp07206j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
NMR and conductivity spectroscopy reveal 2D diffusion in both microcrystalline and nanocrystalline RbSn2F5.
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Affiliation(s)
- Maria Gombotz
- Christian Doppler Laboratory for Lithium Batteries, and Institute for Chemistry and Technology of Materials
- Graz University of Technology (NAWI Graz)
- 8010 Graz
- Austria
| | - Sarah Lunghammer
- Christian Doppler Laboratory for Lithium Batteries, and Institute for Chemistry and Technology of Materials
- Graz University of Technology (NAWI Graz)
- 8010 Graz
- Austria
| | - Stefan Breuer
- Christian Doppler Laboratory for Lithium Batteries, and Institute for Chemistry and Technology of Materials
- Graz University of Technology (NAWI Graz)
- 8010 Graz
- Austria
| | - Ilie Hanzu
- Christian Doppler Laboratory for Lithium Batteries, and Institute for Chemistry and Technology of Materials
- Graz University of Technology (NAWI Graz)
- 8010 Graz
- Austria
- Alistore-ERI European Research Institute
| | - Florian Preishuber-Pflügl
- Christian Doppler Laboratory for Lithium Batteries, and Institute for Chemistry and Technology of Materials
- Graz University of Technology (NAWI Graz)
- 8010 Graz
- Austria
| | - H. Martin R. Wilkening
- Christian Doppler Laboratory for Lithium Batteries, and Institute for Chemistry and Technology of Materials
- Graz University of Technology (NAWI Graz)
- 8010 Graz
- Austria
- Alistore-ERI European Research Institute
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Breuer S, Uitz M, Wilkening HMR. Rapid Li Ion Dynamics in the Interfacial Regions of Nanocrystalline Solids. J Phys Chem Lett 2018; 9:2093-2097. [PMID: 29630367 DOI: 10.1021/acs.jpclett.8b00418] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Diffusive processes are ubiquitous in nature. In solid state physics, metallurgy and materials science the diffusivity of ions govern the functionality of many devices such as sensors or batteries. Motional processes on surfaces, across interfaces or through membranes can be quite different to that in the bulk. A direct, quantitative description of such local diffusion processes is, however, rare. Here, we took advantage of 7Li longitudinal nuclear magnetic relaxation to study, on the atomic length scale, the diffusive motion of lithium spins in the interfacial regions of nanocrystalline, orthorhombic LiBH4. Magnetization transients and free induction decays revealed a fast subset of Li ions having access to surface pathways that offer activation barriers (0.18 eV) much lower than those in the crystalline bulk regions (0.55 eV). These observations make orthorhombic borohydride a new nanostructured model system to study disorder-induced enhancements in interfacial diffusion processes.
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Affiliation(s)
- S Breuer
- Christian Doppler Laboratory for Lithium Batteries, and Institute for Chemistry and Technology of Materials , Graz University of Technology , Stremayrgasse 9 , 8010 Graz , Austria
| | - M Uitz
- Christian Doppler Laboratory for Lithium Batteries, and Institute for Chemistry and Technology of Materials , Graz University of Technology , Stremayrgasse 9 , 8010 Graz , Austria
| | - H M R Wilkening
- Christian Doppler Laboratory for Lithium Batteries, and Institute for Chemistry and Technology of Materials , Graz University of Technology , Stremayrgasse 9 , 8010 Graz , Austria
- Alistore-ERI European Research Institute , 33 rue Saint Leu , 80039 Amiens , France
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Fluorine Translational Anion Dynamics in Nanocrystalline Ceramics: SrF2-YF3 Solid Solutions. CRYSTALS 2018. [DOI: 10.3390/cryst8030122] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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