期刊
JOURNAL OF POWER SOURCES
卷 529, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231247
关键词
Lithium-ion cells; Fluorinated electrolytes; Cycling; High-temperature storage; Safety
资金
- National Natural Science Foundation of China [51874184]
- Key R&D programs (Social Development) in Jiangsu Province [BE2016771]
- Key Natural Science Foun-dation in Jiangsu Province [18KJA620003]
- Jiangsu Project Plan for Outstanding Talents Team in Six Research Fields
This study comprehensively investigates a fluorinated electrolyte proposed by Im et al., and finds that the electrolyte with added LFO (FF19+3LFO) can improve the cycling performance of lithium-ion batteries under high-voltage conditions. The FF19+3LFO cells also demonstrate better performance in high-temperature storage tests and accelerating rate calorimetry tests. These findings are important for achieving high-capacity and high-safety lithium-ion cells.
This work performed a comprehensive investigation on a fluorinated electrolyte (1 M LiPF6 in a 1:9 solvent blend, by mass, of fluoroethylene carbonate (FEC) and methyl (2,2,2-trifluoroethyl) carbonate (FEMC)) proposed by Im et al. [1]. The fluorinated electrolyte addicted with 3 wt% lithium difluorophosphate (LFO), named FF19+3LFO is found to demonstrate better cycling performance in high-voltage Li(Ni0.8Mn0.1Co0.1)O-2 lithium-ion cells over the other researched electrolytes. The improvement of cells' performance under high-voltage conditions is revealed to benefit from the robust CEI layers formed by FF19+3LFO, which can significantly enhance the electrode/electrolyte interface and restrain the side reactions between cathode materials and electrolytes. Moreover, the FF19+3LFO cells also illustrate more competitive performance than the conventional non-aqueous electrolyte based cells in the high-temperature storage tests, accelerating rate calorimetry (ARC) tests, nail tests, overcharge tests, and so on. In short, the electrochemical and safety features of high-voltage cells are effectively improved by FF19+3LFO. More concern into the fluorinated electrolyte is warranted for achieving the high-capacity and high-safety lithium-ion cells.
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