Fluoroethylene carbonate (FEC) and lithium oxalyldifluoroborate (LiDFOB) were regarded as the excellent solvent and additive for high voltage lithium-ion battery electrolyte due to their excellent electrochemical stability and protection film forming ability. LiDFOB and Tris(trimethylsilyl)borate (TMSB) were chosen as additive of 1 mol/L LiPF6 FEC/Propylene carbonate (PC)/Dimethyl carbonate (DMC) electrolyte for LiNi0.5Mn1.5O4 battery. The electrochemical performances of the electrolytes LiDFOB and additive TMSB have been systematically investigated. The differences between these two electrolytes were also demonstrated by SEM and cyclic voltammetry. The results showed that decomposed potential of the electrolyte with LiDFOB+additive TMSB can be enhanced to 5.5 V (vs. Li/Li+) and the Al current collector could be effectively passivated. The initial discharge capacity of Li/LiNi0.5Mn1.5O4 half cell operated with electrolyte with LiDFOB and TMSB was 126.8 mA?h/g, the coulomb efficiency was 99%. After 200 cycles, the discharge specific capacity was 108.2 mA?h/g, and it added retained 85.3% of its initial discharge capacity, while it is only 60.7% after 85 cycles for the one operated with the same basic electrolyte but without additive.
Liang ZHANG Lan ZHANG Shimou CHEN Yibo WANG Xingmei LV
. High Voltage Electrochemical Properties of FEC/PC/DMC Electrolyte with LiDFOB[J]. The Chinese Journal of Process Engineering, 2018
, 18(3)
: 605
-611
.
DOI: 10.12034/j.issn.1009-606X.217371
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