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Morino Y, Otoyama M, Okumura T, Kuratani K, Takemoto S, Ito D, Sano H. Elucidating the Reductive Decomposition Mechanism in Sulfide Solid Electrolyte Li 4SnS 4. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38653212 DOI: 10.1021/acsami.4c00819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
The sulfide solid electrolyte Li4SnS4 has garnered considerable interest due to its exceptional moisture durability, which is attributed to its stable hydrated state. However, a major limitation of certain sulfide solid electrolytes, including Li4SnS4, is their low reduction durability, which limits their application in the negative electrodes of all-solid-state batteries and impedes qualitative material development assessments. In this study, we introduced a quantitative and straightforward method for evaluating the reductive decomposition of Li4SnS4 to better understand its degradation mechanism. The configuration of the electrochemical evaluation cell was modified from SUS|Li4SnS4|Li to SUS|Li4SnS4|Li3PS4|Li, allowing for stabilization of the reference potential of the counter electrode. The reductive decomposition potential of Li4SnS4 was quantitatively assessed by using cyclic voltammetry in a two-layer electrochemical evaluation cell. We observed a minor irreversible reduction current below +1.2 V and a pronounced decomposition peak at +1.0 V. Notably, reductive decomposition continued below 0 V, which is typically the onset point for Li electrodeposition. Postreduction, the solid electrolyte was comprehensively analyzed through optical microscopy, X-ray diffraction, and X-ray absorption spectroscopy. These analyzes revealed the following: (i) The SnS44- unit in Li4SnS4 initially decomposes into Li2S and β-Sn with the dissociation of the Sn-S bond; (ii) the resulting β-Sn forms LixSn alloys such as Li0.4Sn; and (iii) the ongoing reductive decomposition reaction is facilitated by the electronic conductivity of these LixSn alloys. These findings offer crucial methodological and mechanistic insights into the development of higher-performance solid electrolyte materials.
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Affiliation(s)
- Yusuke Morino
- Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto 617-8555, Japan
| | - Misae Otoyama
- National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan
| | - Toyoki Okumura
- National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan
| | - Kentaro Kuratani
- National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan
| | - Seiji Takemoto
- Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto 617-8555, Japan
| | - Daisuke Ito
- Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto 617-8555, Japan
| | - Hikaru Sano
- National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan
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Lu G, Jiang Y, Wu X, Geng F, Li C, Hu B, Shen M. "Win-Win" Modification of LiCoO 2 Enables Stable and Long-Life Cycling of Sulfide-Based All Solid-State Batteries. CHEMSUSCHEM 2023; 16:e202300517. [PMID: 37436845 DOI: 10.1002/cssc.202300517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 07/02/2023] [Accepted: 07/11/2023] [Indexed: 07/14/2023]
Abstract
Interfacial side reactions and space charge layers between the oxide cathode material and the sulfide solid-state electrolytes (SSEs), along with the structural degradation of the active material, significantly compromise the electrochemical performance of all-solid-state batteries (ASSLBs). Surface coating and bulk doping of the cathodes are considered the most effective approaches to mitigate the interface issues between the cathode and SSEs and enhance the structural integrity of composite cathodes. Here, a one-step low-cost means is ingeniously designed to modify LiCoO2 (LCO) with heterogeneous Li2 TiO3 /Li(TiMg)1/2 O2 surface coating and bulk gradient Mg doping. When applied in Li10 GeP2 S12 -based ASSLBs, the Li2 TiO3 and Li(TiMg)1/2 O2 coating layers effectively suppress interfacial side reactions and weaken space charge layer effect. Furthermore, gradient Mg doping stabilizes the bulk structure to mitigate the formation of spinel-like phases during local overcharging caused by solid-solid contact. The modified LCO cathodes exhibit excellent cycle performance with a capacity retention of 80 % after 870 cycles. This dual-functional strategy provides the possibility for large-scale commercial implementation of cathodes modification in sulfide based ASSLBs in the future.
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Affiliation(s)
- Guozhong Lu
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, P. R. China
| | - Ying Jiang
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, P. R. China
| | - Xiang Wu
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, P. R. China
| | - Fushan Geng
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, P. R. China
| | - Chao Li
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, P. R. China
| | - Bingwen Hu
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, P. R. China
| | - Ming Shen
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, P. R. China
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Zhang J, Deng W, Weng Y, Li X, Mao H, Lu T, Zhang W, Long D, Jiang F. Experimentally revealed and theoretically certified synergistic electronic interaction of V-doped CoS for facilitating the oxygen evolution reaction. Phys Chem Chem Phys 2023; 25:21661-21672. [PMID: 37551545 DOI: 10.1039/d3cp02849f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
Since electrocatalytic oxygen evolution (OER) is a four-electron transfer reaction with very slow kinetics, there is great competition to develop cheap, durable and efficient catalysts for oxygen evolution. A molecular model is designed for density functional theory (DFT) simulation calculations to guide the experiment, and this hypothesis is fully supported by the experimental data. Herein, regulating the composition and morphology of the bimetallic VCo and MoCo sulfide and monometallic sulfide nanoparticles (NPs) at the oil-water interface was achieved via a one-step hydrothermal method for efficient and durable OER electrocatalysts. Compared to CoS and MoCoS, the VCoS NPs show superior OER performance. By adjusting the atomic composition ratio of the VCoS nanoparticles, the VCoS NPs (1 : 2 : 1.5 mole ratio) showed a significant OER overpotential η = 255 mV (10 mA cm-2), and their outstanding stability was demonstrated after 48 h of continuous testing. The CoS and MoCoS NPs were also tested for comparison. Density functional theory (DFT) calculations showed that appropriate V doping (VCoS) can heighten the density of states (DOS) of the Fermi level, which generates more charge density and reduces the intermediate adsorption energy. This study not only provides efficient and powerful integrated catalysts, but also details a DFT calculation model guided by experiments to regulate the oxygen insertion technology, thus leading to the design of ideal materials and enabling more far-reaching applications in electrocatalysis.
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Affiliation(s)
- Jingjing Zhang
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
| | - Wei Deng
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
| | - Yun Weng
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Textile, Donghua University, Shanghai 201620, China
| | - Xiang Li
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
| | - Haifang Mao
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
| | - Tiandong Lu
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
| | - Wenqian Zhang
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
| | - Dewu Long
- Key Laboratory in Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
| | - Fei Jiang
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
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Morino Y, Shiota A, Kanada S, Bong WSK, Kawamoto K, Inda Y, Tsukasaki H, Mori S, Iriyama Y. Design of Cathode Coating Using Niobate and Phosphate Hybrid Material for Sulfide-Based Solid-State Battery. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37463070 DOI: 10.1021/acsami.3c02827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Abstract
Coating the surface of the cathode active material of all-solid-state batteries with sulfide-based solid electrolytes is key for improving and enhancing the battery performance. Although lithium niobate (LiNbO3) is one of the most representative coating materials, its low durability at a highly charged potential and high temperature is an impediment to the realization of high-performance all-solid-state batteries. In this study, we developed new hybrid coating materials consisting of lithium niobate (Li-Nb-O) and lithium phosphate (Li-P-O) and investigated the influence of the ratio of P/(Nb + P) on the durability performance. The cathode half-cells, using a sulfide-based solid electrolyte Li6PS5Cl/cathode active material, LiNi0.5Co0.2Mn0.3O2, coated with the new hybrid coating materials of LiPxNb1-xO3 (x = 0-1), were exposed to harsh conditions (60 °C and 4.55 V vs Li/Li+) for 120 h as a degradation test. P substitution resulted in higher durability and lower interfacial resistance. In particular, the hybrid coating with x = 0.5 performed better, in terms of capacity retention and interfacial resistance, than those with other compositions of niobate and phosphate. The coated cathode active materials were analyzed using various analytical techniques such as scanning electron microscopy/energy-dispersive X-ray spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy (XAS) to elucidate the improvement mechanism. Moreover, the degraded cathodes were observed using time-of-flight secondary-ion mass spectrometry, TEM/electron diffraction, and XAS. These analyses revealed that the Nb-O-P coordination in the hybrid coating material captured O by P. The coordination suppressed the release of O from the coating layer as a decomposition side reaction to realize a higher durability than that of LiNbO3.
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Affiliation(s)
- Yusuke Morino
- Consortium for Lithium Ion Battery Technology and Evaluation Center (LIBTEC) 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Akihiro Shiota
- Consortium for Lithium Ion Battery Technology and Evaluation Center (LIBTEC) 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Satoshi Kanada
- Consortium for Lithium Ion Battery Technology and Evaluation Center (LIBTEC) 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Willy Shun Kai Bong
- Consortium for Lithium Ion Battery Technology and Evaluation Center (LIBTEC) 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Koji Kawamoto
- Consortium for Lithium Ion Battery Technology and Evaluation Center (LIBTEC) 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Yasushi Inda
- OHARA INC. 1-15-30, Oyama, Chuo-ku, Sagamihara, Kanagawa 252-5286, Japan
| | - Hirofumi Tsukasaki
- Department of Materials Science, Osaka Metropolitan University, Sakai, Osaka 599-8531, Japan
| | - Shigeo Mori
- Department of Materials Science, Osaka Metropolitan University, Sakai, Osaka 599-8531, Japan
| | - Yasutoshi Iriyama
- Department of Material Design Innovation Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
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Morino Y, Tsukasaki H, Mori S. Microscopic Degradation Mechanism of Argyrodite-Type Sulfide at the Solid Electrolyte-Cathode Interface. ACS APPLIED MATERIALS & INTERFACES 2023; 15:23051-23057. [PMID: 37130265 DOI: 10.1021/acsami.3c00462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Interfacial engineering of sulfide-based solid electrolyte/lithium-transition-metal oxide active materials in all-solid-state battery cathodes is vital for cell performance parameters, such as high-rate charge/discharge, long lifetime, and wide temperature range. A typical interfacial engineering method is the surface coating of the cathode active material with a buffer layer, such as LiNbO3. However, cell performance reportedly degrades under harsh environments even with a LiNbO3 coating, such as high temperatures and high cathode potentials. Therefore, we investigated the interfacial degradation mechanism focusing on the solid electrolyte side for half cells employing the cathode mixture of argyrodite-type Li6PS5Cl/LiNbO3-coated LiNi0.5Co0.2Mn0.3O2 exposed at 60 °C and 4.25 and 4.55 V vs Li/Li+ using transmission electron microscopy/electron diffraction (TEM/ED) and X-ray absorption spectroscopy (XAS). The TEM/ED results indicated that the ED pattern of the argyrodite structure disappeared and changed to an amorphous phase as the cells degraded. Moreover, the crystal phases of LiCl and Li2S appeared simultaneously. Finally, XAS analysis confirmed the decrease in the PS4 units of the argyrodite structure and the increase in local P-S-P domains with delithiation from the interfacial solid electrolyte, corresponding to the TEM/ED results. In addition, the formation of P-O bonds was confirmed during degradation at higher cathode potentials, such as 4.55 V vs Li/Li+. These results indicate that the degradation of this interfacial region determines the cell performance.
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Affiliation(s)
- Yusuke Morino
- Consortium of Lithium Ion Battery Technology and Evaluation Center (LIBTEC) 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Hirofumi Tsukasaki
- Department of Materials Science, Osaka Metropolitan University, Sakai, Osaka 599-8531, Japan
| | - Shigeo Mori
- Department of Materials Science, Osaka Metropolitan University, Sakai, Osaka 599-8531, Japan
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