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

J. I. Yamaki, Masayuki Ihara, Shigeto Okada

Research output: Contribution to journalConference article

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)59-65
Number of pages7
JournalINTELEC, International Telecommunications Energy Conference (Proceedings)
Publication statusPublished - Dec 1 2003
EventThe 25th International Telecommunications Energy Conference - Yokohama, Japan
Duration: Oct 19 2003Oct 23 2003

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All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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