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›› 2012, Vol. 12 ›› Issue (2): 340-344.

• 材料工程专栏 • Previous Articles     Next Articles

Application of Film-forming Additives for Ionic Liquid Based Electrolyte

SUN Min-qian HU Zhi-qiang CAI Ying-jun DONG Tao LU Xing-mei   

  1. School of Textile and Material Engineering, Dalian Polytechnic University School of Textile and Material Engineering State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, CAS State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, CAS Institute of Process Engineering, Chinese Academy of Sciences
  • Received:2012-02-01 Revised:2012-03-01 Online:2012-04-20 Published:2012-04-20
  • Contact: SUN Min-qian

Application of Film-forming Additives for Ionic Liquid Based Electrolyte

孙敏倩 胡志强 蔡迎军 董陶 吕兴梅   

  1. 大连工业大学 大连工业大学 中国科学院过程工程研究所多相复杂系统国家重点实验室 中国科学院过程工程研究所多相复杂系统国家重点实验室 中国科学院过程工程研究所
  • 通讯作者: 孙敏倩

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Abstract: N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl)imide was synthesized for the application in ionic liquid based electrolytes in lithium ion battery, 10% vinylene carbonate (VC) and 10% 1,3-propane sultone (PS) were added to the electrolyte system respectively as additives to improve the property of solid electrolyte interface and cyclic performance. The results of cyclic voltammetry showed that homogenous and compact solid electrolyte interface film formed on graphite electrode which was detected by observing the morphology of cycled graphite anode. Charging and discharging performance of LiFePO4/Li half cell was tested in the electrolyte with or without additives. The initial specific discharging capacities were increased to 129.4 and 123.0 mA×h/g by the addition of VC and PS, respectively, compared with that of additive-free electrolyte. The discharging retentions were 88.9% and 84.6% in electrolyte containing VC and PS after 10 cycles.

Key words: vinylene carbonate, 3-propane sultone, N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl)imide, solid electrolyte interface

摘要： N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl)imide was synthesized for the application in ionic liquid based electrolytes in lithium ion battery, 10% vinylene carbonate (VC) and 10% 1,3-propane sultone (PS) were added to the electrolyte system respectively as additives to improve the property of solid electrolyte interface and cyclic performance. The results of cyclic voltammetry showed that homogenous and compact solid electrolyte interface film formed on graphite electrode which was detected by observing the morphology of cycled graphite anode. Charging and discharging performance of LiFePO4/Li half cell was tested in the electrolyte with or without additives. The initial specific discharging capacities were increased to 129.4 and 123.0 mA×h/g by the addition of VC and PS, respectively, compared with that of additive-free electrolyte. The discharging retentions were 88.9% and 84.6% in electrolyte containing VC and PS after 10 cycles.

关键词: vinylene carbonate, 3-propane sultone, N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl)imide, solid electrolyte interface

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