Thermal Stability of Methyl Difluoroacetate as a Novel Electrolyte Solvent for Lithium Batteries Electrolytes

Jun-ichi Yamaki, Takaaki Tanaka, Masayuki Ihara, Kazuya Sato, Izumi Watanabe, Minato Egashira, Shigeto Okada

Research output: Contribution to journalArticle

Abstract

<p>LiPF<sub>6</sub>/Methyl difluoroacetate (MFA) shows a very good thermal stability with Li metal. However, LiPF<sub>6</sub>/Ethyl difluoroacetate (EFA) did not show any improvement of the thermal stability. Using FTIR and XPS, the main component of SEI in the MFA electrolyte was found to be CHF<sub>2</sub>COOLi. However, CHF<sub>2</sub>COOLi does not exist in the SEI of the EFA electrolyte, because CHF<sub>2</sub>COOLi dissolves in EFA electrolyte. CHF<sub>2</sub>COOLi was found to dissolve in EC, DMC, and DEC. Therefore, the addition of a small amount of MFA in 1 M LiPF<sub>6</sub>/EC + DMC, DMC, and DEC electrolytes was not effective to improve thermal stability.</p>
Original languageEnglish
Pages (from-to)1154-1156
Number of pages3
JournalElectrochemistry
Volume71
Issue number12
DOIs
Publication statusPublished - Dec 5 2003

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