Journal
JOURNAL OF POWER SOURCES
Volume 412, Issue -, Pages 527-535Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2018.11.083
Keywords
bis(trimethylsilyl) 2-methyl-2-fluoromalonate (BTMSMFM); bis(trimethylsilyl) 2-ethyl-2-fluoromalonate (BTMSEFM); bis(trimethylsilyl) 2-propyl-2-fluoromalonate (BTMSPFM); Additive; LiNi0.80Cd0.15Al0.05O2 (NCA); Lithium ion batteries
Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC05-000R22725]
- ORNL's Center for Nanophase Materials Sciences - U.S. Department of Energy, Office of Science, Scientific User Facility Division
- U.S. Department of Energy [DE-AC05-00OR22725]
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Three trimethylsilyl based malonate esters, bis(trimethylsilyl) 2-methyl-2-fluoromalonate (BTMSMFM), bis(trimethylsilyl) 2-ethyl-2-fluoromalonate (BTMSEFM) and bis(trimethylsilyl) 2-propyl-2-fluoromalonate (BTMSPFM), have been used as additives in 1.0 M LiPF6/ethylene carbonate (EC)-dimethyl carbonate (DMC)-diethyl carbonate (DEC) (1-1-1, by v) baseline electrolyte for LiNi0.80Co0.15Al0.05O2 (NCA) based high voltage lithium ion batteries. The NCA half-cells with 5 wt% BTMSMFM exhibit higher capacity retention than that in the baseline electrolyte at different upper cut off voltages, that is, 4.2, 4.3, 4.4 and 4.5 V vs. Li/Li+. Scanning electron microscope (SEM) show that the additive successfully prevents the formation of thick solid electrolyte interphase (SEI) films on the surface of the NCA electrodes. X-ray diffraction (XRD) further reveals that the crystal structure of NCA is also maintained in the electrolyte with 5 wt% BTMSMFM at high cut off voltages. Besides beneficial to NCA cathode, the BTMSMFM additive also ensures better cycling performance of the graphite based half-cells and NCA/graphite full-cells, and thus is a promising additive for application in rechargeable lithium ion batteries.
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