Charge/discharge performances of glyme-lithium salt equimolar complex electrolyte for lithium secondary batteries

Shiro Seki, Nobuyuki Serizawa, Katsuhito Takei, Kaoru Dokko, Masayoshi Watanabe

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14 Citations (Scopus)

Abstract

The electrochemical and battery performances of a CH3-O-(C 2H4O)3-CH3/LiN(SO2CF 3)2 1:1 equimolar complex electrolyte were evaluated using [Li metal|Li metal], [LiFePO4|Li metal], and [LiNi 1/3Mn1/3Co1/3O2|Li metal] cells. A relatively favorable surface was formed at the Li metal/electrolyte interface revealed by observation of the storage time dependence of the electrochemical impedance spectroscopy. A 3V-class [LiFePO4|Li metal] cell exhibited favorable capacity retention with little degradation after 600 cycles (2.5-4.0 V). A 4V-class [LiNi1/3Mn1/3Co1/3O 2|Li metal] cell also exhibited good capacity retention of approximately 60% of the initial discharge capacity after 400 cycles (2.7-4.2 V), while the capacity retention decreased markedly upon increasing the upper charge cutoff voltage above 4.4 V.

Original languageEnglish
Pages (from-to)323-327
Number of pages5
JournalJournal of Power Sources
Volume243
DOIs
Publication statusPublished - 2013 Jul 15
Externally publishedYes

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Keywords

  • Charge/discharge
  • Glyme
  • Lithium salt
  • Long cycle life
  • Safety electrolyte

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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