期刊
CHEMISTRY OF MATERIALS
卷 32, 期 8, 页码 3405-3413出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b05003
关键词
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资金
- National Natural Science Foundation for Distinguished Young Scholars of China [51625204]
- National Natural Science Foundation of China [51703236]
- Youth Innovation Promotion Association of CAS [2016193]
- Key Research and Development Plan of Shandong Province, P. R. China [2018GGX104016]
- National Key R&D Program of China [2018YFB0104300]
- Key Scientific and Technological Innovation Project of Shandong [2017CXZC0505]
- NSFC-Shandong Joint Fund [U1706229]
Nonflammable functional electrolytes with remarkably interfacial compatibility toward both lithium anodes and high-voltage cathodes are considered as the ultimate pursuit for rechargeable lithium metal battery. For this target, we report a dual-anion deep eutectic solution (D-DES) based on elaborately selected combination of nitrite and functional lithium salts. The interactions of succinonitrile with cation/anion are highlighted by in situ/ex situ measurements, which endow D-DES with excellent ionic conductivity and significantly enhanced interface stability. By using this D-DES, constant LilLi cycling over 1 year (>10,000 h) under a Li capacity of 5 mA h cm(-2) can be achieved. The capacity retention is still over 70% with a high charging voltage of 4.7 V for 500 cycles in LiCoO2 vertical bar Li battery. Pouch cells with high areal capacity close to practical application also deliver superior safe performance. This study paves a new pathway for designing high-safety electrolyte and boosts the practical application of high-voltage lithium metal battery.
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