Sodium Difluoro(oxalato)borate as An Electrolyte Additive to Improve the Electrochemical Performance of Graphite Anode

Authors

Yang-yang YAO, College of chemistry and chemical engineering of Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;Jiangsu Huadong Institute of Li-ion Battery, Zhangjiagang 215600, Jiangsu, China;
Dong-dong LIU, College of chemistry and chemical engineering of Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;
Li WANG, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
Xiang-ming HE, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;Jiangsu Huadong Institute of Li-ion Battery, Zhangjiagang 215600, Jiangsu, China;
Jian-jun LI, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;Jiangsu Huadong Institute of Li-ion Battery, Zhangjiagang 215600, Jiangsu, China;
Ding ZHANG, College of chemistry and chemical engineering of Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;Follow

Corresponding Author

Ding ZHANG(zhangding@tyut.edu.cn)

Abstract

The fast development in applications of Li-ion batteries (LiBs) in daily life urges for better electrochemical performance of LiBs, which can be promoted by adding appropriate electrolyte additives. This work studied the effect of NaDFOB as the additive on a common electrolyte formula (1 mol·L^-1 LiPF₆ in EC+DMC+EMC, 1:1:1 by volume). Analysis methods such as CV, EIS and SEM were adopted to study electrochemical performance of experimental battery and interface profiles. It was revealed that the reversible charge-discharge capacity and cycling performance of graphite anode had been dramatically improved. In addition, the cycling performance of graphite anode at moderate temperature was obviously improved by the adoption of NaDFOB. Both anion and cation in NaDFOB participated the formation of SEI film on the graphite anode surface and thus generated a highly stable electrolyte/electrode interface.

Graphical Abstract

Keywords

Li-ion battery, electrolyte additive, graphite, SEI film, sodium difluoro (oxalato)borate

DOI Link

https://doi.org/10.13208/j.electrochem.150430

Publication Date

2015-08-28

Online Available Date

2015-08-28

Revised Date

2015-05-29

Received Date

2015-04-30

Recommended Citation

Yang-yang YAO, Dong-dong LIU, Li WANG, Xiang-ming HE, Jian-jun LI, Ding ZHANG. Sodium Difluoro(oxalato)borate as An Electrolyte Additive to Improve the Electrochemical Performance of Graphite Anode[J]. Journal of Electrochemistry, 2015 , 21(4): 387-392.
DOI: 10.13208/j.electrochem.150430
Available at: https://jelectrochem.xmu.edu.cn/journal/vol21/iss4/13