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Gao X, Zeng X, Hu H, Li H, He X, Fan W, Fan C, Yang T, Ma Z, Nan J. A Functional Electrolyte Containing P-Phenyl Diisothiocyanate (PDITC) Additive Achieves the Interphase Stability of High Nickel Cathode in a Wide Temperature Range. Chemistry 2024; 30:e202303632. [PMID: 38150289 DOI: 10.1002/chem.202303632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 12/25/2023] [Accepted: 12/27/2023] [Indexed: 12/28/2023]
Abstract
The lithium-ion batteries (LIBs) with high nickel cathode have high specific energy, but as the nickel content in the cathode active material increases, batteries are suffering from temperature limitations, unstable performance, and transition metal dissolution during long cycling. In this work, a functional electrolyte with P-phenyl diisothiocyanate (PDITC) additive is developed to stabilize the performance of LiNi0.8 Co0.1 Mn0.1 O2 (NCM811)/graphite LIBs over a wide temperature range. Compared to the batteries without the additive, the capacity retention of the batteries with PDITC-containing electrolyte increases from 23 % to 74 % after 1400 cycles at 25 °C, and from 15 % to 85 % after 300 cycles at 45 °C. After being stored at 60 °C, the capacity retention rate and capacity recovery rate of the battery are also improved. In addition, the PDITC-containing battery has a higher discharge capacity at -20 °C, and the capacity retention rate increases from 79 % to 90 % after 500 cycles at 0 °C. Both theoretical calculations and spectroscopic results demonstrate that PDITC is involved in constructing a dense interphase, inhibiting the decomposition of the electrolyte and reducing the interfacial impedance. The application of PDITC provides a new strategy to improve the wide-temperature performance of the NCM811/graphite LIBs.
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Affiliation(s)
- Xiang Gao
- School of Chemistry, South China Normal University, Guangzhou, Guangdong, 510006
| | - Xueyi Zeng
- School of Chemistry, South China Normal University, Guangzhou, Guangdong, 510006
| | - Huilin Hu
- School of Chemistry, South China Normal University, Guangzhou, Guangdong, 510006
| | - Haijia Li
- School of Chemistry, South China Normal University, Guangzhou, Guangdong, 510006
| | - Xin He
- School of Chemistry, South China Normal University, Guangzhou, Guangdong, 510006
| | - Weizhen Fan
- School of Chemistry, South China Normal University, Guangzhou, Guangdong, 510006
- Guangzhou Tinci Materials Technology Co., Ltd., Guangzhou, Guangdong, 510760
| | - Chaojun Fan
- Guangzhou Tinci Materials Technology Co., Ltd., Guangzhou, Guangdong, 510760
| | - Tianxiang Yang
- School of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang, Henan, 471023
| | - Zhen Ma
- School of Chemistry, South China Normal University, Guangzhou, Guangdong, 510006
| | - Junmin Nan
- School of Chemistry, South China Normal University, Guangzhou, Guangdong, 510006
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Chen C, Guo J, Wu C, Duan X, Zhang L. Borate-Functionalized Disiloxane as Effective Electrolyte Additive for 4.5 V LiNi 0.8Co 0.1Mn 0.1O 2/Graphite Batteries. ACS APPLIED MATERIALS & INTERFACES 2024; 16:8733-8741. [PMID: 38345337 DOI: 10.1021/acsami.3c16531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) is considered the most prominent cathode material to establish a practical high energy density of lithium-ion batteries (LIBs) for future electric vehicles. The energy density of LIBs is greatly determined by the capacity of electrode materials and the operating voltage of the cells. To further improve the cycle lifespan of NCM811 batteries to meet the requirement of driving range for the electric vehicle market, it is vital to design a novel electrolyte additive that can enhance the stability of the cathode/electrolyte interface at a wide range of voltage. Herein, a novel borate functionalized disiloxane compound, 1,1,1,3,3-pentamethyl-3-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl) disiloxane (PMBPDS), is synthesized as cathode electrolyte interphase (CEI) film-forming additive to improve the cycling performance of NCM811 batteries. Systematic studies reveal that PMBPDS can construct a stable CEI film on the NCM811 surface and efficiently scavenge hydrofluoric acid (HF). The PMBPDS-derived CEI prevents the dissolution of transmission metals in the NCM811 cathode and enhances the capacity retention of NCM811/graphite cells from 68.3 to 70.6% after 200 cycles at 1 C in the voltage window of 3-4.5 V. This work provides more understanding on designing the molecular structure of additive compounds for improving the electrochemical performance of LIBs.
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Affiliation(s)
- Cheng Chen
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
| | - Jiali Guo
- Dongguan Amperex Technology Ltd., Songshan Lake, Dongguan 523808, Guangdong, China
| | - Chunlei Wu
- Hubei Huifu Nanomaterial Co. Ltd., Yichang 443007, Hubei , China
| | - Xianjian Duan
- Hubei Huifu Nanomaterial Co. Ltd., Yichang 443007, Hubei , China
| | - Lingzhi Zhang
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
- School of Energy Science and Engineering, University of Science and Technology of China, Hefei 230026, Anhui, China
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Joo MJ, Kim M, Chae S, Ko M, Park YJ. Additive-Derived Surface Modification of Cathodes in All-Solid-State Batteries: The Effect of Lithium Difluorophosphate- and Lithium Difluoro(oxalato)borate-Derived Coating Layers. ACS APPLIED MATERIALS & INTERFACES 2023; 15:59389-59402. [PMID: 38102994 DOI: 10.1021/acsami.3c12858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2023]
Abstract
Sulfide-based electrolytes, with their high conductivity and formability, enable the construction of high-performance, all-solid-state batteries (ASSBs). However, the instability of the cathode-sulfide electrolyte interface limits the commercialization of these ASSBs. Surface modification of cathodes using the coating technique has been explored as an efficient approach to stabilize these interfaces. In this study, the additives lithium difluorophosphate (LiDFP) and lithium difluoro(oxalato)borate (LiDFOB) are used to fabricate stable cathode coatings via heat treatment. The low melting points of LiDFP and LiDFOB enable the formation of thin and uniform coating layers by a low-temperature heat treatment. All-solid-state cells containing LiDFP- and LiDFOB-coated cathodes show electrochemical performances significantly better than those comprising uncoated cathodes. Among all of the as-prepared coated cathodes, LiDFP-coated cathodes fabricated using a slightly lower temperature than the phase-transition temperature of LiDFP (320 °C) show the best discharge capacity, rate capability, and cyclic performance. Furthermore, cells comprising LiDFP-coated cathodes showed significantly low impedance. X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy confirm the effectiveness of the LiDFP coating. LiDFP-coated cathodes minimized side-reactions during cycling, resulting in a significantly low cathode-surface degradation. Hence, this study highlights the efficiency of the proposed coating method and its potential to facilitate the commercialization of ASSBs. Overall, this study reports an effective technique to stabilize the cathode-electrolyte interface in sulfide-based ASSBs, which could expedite the practical implementation of these advanced energy-storage devices.
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Affiliation(s)
- Myeong Jun Joo
- Department of Advanced Materials Engineering, Graduate School Kyonggi University, 154-42, Gwanggyosan-Ro, Yeongtong-Gu, Suwon-Si, Gyeonggi-Do 16227, Republic of Korea
| | - Minseong Kim
- Division of Convergence Materials Engineering, Pukyong National University, Busan 48547, Republic of Korea
| | - Sujong Chae
- Division of Applied Chemical Engineering, Pukyong National University, Busan 48547, Republic of Korea
| | - Minseong Ko
- Division of Convergence Materials Engineering, Pukyong National University, Busan 48547, Republic of Korea
| | - Yong Joon Park
- Department of Advanced Materials Engineering, Graduate School Kyonggi University, 154-42, Gwanggyosan-Ro, Yeongtong-Gu, Suwon-Si, Gyeonggi-Do 16227, Republic of Korea
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Han X, Xiang Q, Zhou C, Huang J, Sun J. Self-Purifying Primary Solvation Sheath Enables Stable Electrode-Electrolyte Interfaces for Nickel-Rich Cathodes. NANO LETTERS 2023; 23:7404-7410. [PMID: 37552565 DOI: 10.1021/acs.nanolett.3c01679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
Herein, we optimize the primary solvation sheath to investigate the fundamental correlation between battery performance and electrode-electrolyte interfacial properties through electrolyte solvation chemistry. Experimental and theoretical analyses reveal that the primary solvation sheath with a self-purifying feature can "positively" scavenge both the HF and PF5 (hydrolysis of ion-paired LiPF6), stabilize the PF6 anion-derived electrode-electrolyte interfaces, and thus boost the cycling performances. Being attributed with these superiorities, the NCM811//Li Li metal battery (LMB) with the electrolyte containing the optimized solvation sheath delivers 99.9% capacity retention at 2.5 C after 250 cycles. To circumvent the impact of excess Li content of Li metal on the performance of NCM811 cathode, the as-fabricated NCM811//graphite Li ion battery (LIB) also delivers a high-capacity retention of 90.1% from the 5th to the 100th cycle at 1 C. This work sheds light on the strong ability of the primary solvation sheath to regulate cathode interfacial properties.
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Affiliation(s)
- Xinpeng Han
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Qianxin Xiang
- Guizhou Zhenhua E-Chem Company, Ltd., Guizhou 550014, China
| | - Chaoyi Zhou
- Guizhou Zhenhua E-Chem Company, Ltd., Guizhou 550014, China
| | - Jin Huang
- Guizhou Zhenhua E-Chem Company, Ltd., Guizhou 550014, China
| | - Jie Sun
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Quzhou Institute for Innovation in Resource Chemical Engineering, No. 78, Jiuhuabei Avenue, Quzhou City, Zhejiang Province 324000, China
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