添加剂对锂离子电池自放电性能的影响

doi:10.3969/j.issn.2095-4239.2015.03.009

摘要/Abstract

摘要： 本文采用碳酸亚乙烯酯（VC）、氟代碳酸乙烯酯（FEC）、1,3-二氧戊环（DOL）、1,4-二氧六环（DOX）、苯磺酰氯（BSC）作为添加剂,并对每种添加剂选取了特定的添加比例,分别制备成18650型电池,置于55 ℃环境中,进行特定存储时间的电压、内阻测试,分析锂离子电池在存储过程中的自放电性能,结果表明几种添加剂中VC的效果最好,以1.00%的比例添加时在55℃条件下存储45天,其容量保留率可以达到95.00%,XPS结果表明VC添加后负极电极表面有机溶解性弱的CH₃OLi和稳定性好的ROLi量增加,形成了更加致密稳定的SEI膜,电池自放电性能得到改善。

关键词: 添加剂, 自放电性能, SEI膜

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

中图分类号:

TQ150

程冰冰, 盘毅, 郑毅, 谢凯, 郑春满. 添加剂对锂离子电池自放电性能的影响[J]. 储能科学与技术, 2015, 4(3): 295-299.

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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