Synthesis and Application of New Types of Electrolyte Additives for Lithium Ion Battery†

doi:10.7503/cjcu20160920

Abstract

Abstract:

A series of organic molecules combined with benzene ring and cyclic carbonate as electrolyte additives, including terephthalicacidbis-(2-oxo-[1,3]dioxolan-4-ylmethyl)ester(TABE), benzene-1,3,5-tricarboxylic acid tris-(2-oxo-[1,3]dioxolan-4-ylmethyl) ester(BATE1) and benzene-1,2,4,5-tetracarb-oxylic acid tetrakis-(2-oxo-[1,3]dioxolan-4-ylmethyl) ester(BATE2), was designed and synthesized. The effects of these additives on the electrochemical performance of lithium ion batteries were studied by rate capability, constant current charge-discharge test, electrochemical impedance spectroscopy(EIS) and scanning electron microscopy(SEM). The results showed that the amount of substituents on benzene ring greatly influenced the interface between electrolyte and graphite. Compared with the blank electrolyte, a dense and stable Solid electrolyte interface(SEI) film could be observed on the surface of the graphite electrode with BATE1 or BATE2 after 20 charge-discharge cycles, which could optimize the interface between the electrode and the electrolyte and led to the less increase of battery resistance. The test of the rate capability of the battery showed that the addition of BATE2 could improve the rate performance of the battery; meanwhile TABE could make the battery’s performance worse.

Key words: Electrolyte additive, Derivatives of glycerol carbonate, Lithim ion battery, Solid electrolyte interface(SEI) film

CLC Number:

O646

TrendMD:

GUO Mengya, ZONG Chengxing, AI Shujuan, FU Fengzhi, WANG Qi, LIU Jing, SUN Donglan, GUO Yanling, GUO Yeping. Synthesis and Application of New Types of Electrolyte Additives for Lithium Ion Battery^†[J]. Chem. J. Chinese Universities, 2017, 38(10): 1857.

Figures/Tables 7

Fig.1 Molecular structures of three kinds of compounds

Fig.2 Rate capability of lithium ion batteries with different concentrations of electrolyte additive

Fig.3 Cycling performance of lithium ion batteries with different electrolyte additives

Fig.4 Cycling efficiency of lithium ion battery with different electrolyte additives

Fig.5 Rate capability of lithium ion batteries with different electrolyte additives

Fig.6 AC impedance curves of lithium ion batteries with different electrolyte additives(A) After 2 cycles; (B) after 20 cycles.

Fig.7 SEM images of graphite electrode with different electrolyte additives for lithium ion battery(A) Electrode before cycling; (B) electrode with blank electrolyte after 20 cycles; (C) electrode with 0.7% TABE after 20 cycles;(D) electrode with 0.7% BATE1 after 20 cycles; (E) electrode with 0.7% BATE2 after 20 cycles.

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