Effects of non-equimolar lithium salt glyme solvate ionic liquid on the control of interfacial degradation in lithium secondary batteries

Shiro Seki, Nobuyuki Serizawa, Katsuhito Takei, Seiji Tsuzuki, Yasuhiro Umebayashi, Yasushi Katayama, Takashi Miura, Kaoru Dokko, Masayoshi Watanabe

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Control of interfacial properties between the electrode and electrolyte is important for obtaining long life-cycle lithium-ion secondary batteries. To control interfacial degradation, we investigated the effect of changing the composition ratio of lithium salt (LiN(SO2CF3)2) and low-molecular-weight ether (CH3-O-(C2H4O)3-CH3) in the system. A highly electrochemically stable lithium salt glyme solvated ionic liquid electrolyte was realized, with long-lived, robust lithium solvation complexes by increasing the lithium salt composition ratio. Lithium secondary batteries using the electrolyte show notable suppression of the degradation of interfacial resistance at the interface of the electrolyte and the positive electrode (high oxidation state), which leads to a longer life-cycle of the batteries.

Original languageEnglish
Pages (from-to)33043-33047
Number of pages5
JournalRSC Advances
Volume6
Issue number39
DOIs
Publication statusPublished - 2016

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

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