Improvement of Thermal Stability of Lithium Ion Batteries by Using Methyl Difluoroacetate as an Electrolyte Solvent

J. I. Yamaki, Masayuki Ihara, Shigeto Okada

研究成果: ジャーナルへの寄稿Conference article

6 引用 (Scopus)


The thermal stability of 1M LiPF6/ CHF2COOCH 3 (methyl difluoroacetate, MFA) with lithiated carbon anodes and the electrochemical characteristics of carbon anodes in this electrolyte have been investigated in terms of the use of this electrolyte in lithium-ion batteries. Differential scanning calorimeter (DSC) measurement of LiPF6/ MFA with lithiated carbon anodes indicated that the main exothermic peak is around 400°C. The peak temperature was 110°C higher than the peak of LiPF 6/ EC-DMC [1:1 in vol.] with lithiated carbon anodes. Compared with the case in IM LiPF6/ EC-DMC [1:1 in vol.], the discharge capacity of carbon anodes was slightly smaller in IM LiPF6/ MFA, while the cycling performance was quite similar in both electrolytes. From the result of the impedance measurement, the reason for the small capacity is the large resistance of SEI. Moreover, good cycle performance was obtained for the lithium ion cell used in IM LiPF6/ MFA, while the cell's discharge capacity was slightly lower than that of the lithium-ion cell in 1M LiPF 6/ EC-DMC [1:1 in vol.]. It is noted that IM LiPF6/ MFA electrolyte is a good candidate to improve the thermal stability of the lithium-ion and lithium metal anode battery.

ジャーナルINTELEC, International Telecommunications Energy Conference (Proceedings)
出版物ステータス出版済み - 12 1 2003
イベントThe 25th International Telecommunications Energy Conference - Yokohama, 日本
継続期間: 10 19 200310 23 2003


All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering