The effect of electrolyte additives in improving the self-discharge performance of Li-ion battery

doi:10.3969/j.issn.2095-4239.2015.03.009

Abstract

Abstract: In this paper, we selected VC (vinylene carbonate), FEC (fluorinated ethylene carbonate), DOL (1,3-dioxolane), DOX (1,4-dioxane), BSC (benzenesulfonyl chloride) as the additives for electrolytes. 18650 type Li-ion cells using the electrolytes with varying amount of additives were assembled and stored in an oven at 55 ℃. The voltage and resistance were measured for analyzing the self-discharge. After 45 days stored at 55 ℃, the battery with 1.00% VC additive in the electrolyte showed the best performance, its capacity retention is 95.00%. From X-ray photoelectron spectroscopic analysis, it is observed that the amounts of CH₃OLi and ROLi on the surface of the anode are increased, resulting in forming a stable and compact SEI film, and the self-discharge performance is improved.

Key words: additives, self-discharge performance, SEI film

CLC Number:

TQ150

CHENG Bingbing, PAN Yi, ZHENG Yi, XIE Kai, ZHENG Chunman. The effect of electrolyte additives in improving the self-discharge performance of Li-ion battery[J]. Energy Storage Science and Technology, 2015, 4(3): 295-299.

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