期刊
JOURNAL OF POWER SOURCES
卷 439, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227081
关键词
Lithium-ion battery; Electrolyte additive; Solid electrolyte interface; Fluoroethylene carbonate; Lithium difluorophosphate
资金
- National Key Research and Development Program of China [2016YFB0100100]
- National Natural Science Foundation of China [21805279]
- Science and Technology Planning Project of Fujian Province [2017H0045, 2016T3012]
- Edanz Group China
Fluoroethylene carbonate (FEC) and lithium difluorophosphate (LiPO2F2) are evaluated as hybrid functional additives to improve the electrochemical performance of SiC-based lithium-ion batteries. When added to the electrolyte, FEC + LiPO2F2 significantly enhance the performance of SiC/Li cells. The capacity retention increases from 28.5% to 76.2% after 200 cycles. The effects of FEC + LiPO2F2 are characterized by charge discharge testing, electrochemical impedance spectroscopy, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. Combining the results of these analyses reveals that hybrid functional additives are beneficial for forming a uniform and thinner solid electrolyte interface film on the SiC surface. The solid electrolyte interface film derived from FEC + LiPO2F2 greatly inhibits particle pulverization and electrolyte decomposition, which play an important role in the performance of SiC-based cells.
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