Electrochemical deposition and dissolution of lithium on a carbon fiber composite electrode in a solvate ionic liquid

Naoki Tachikawa, Rie Kasai, Kazuki Yoshii, Masayoshi Watanabe, Yasushi Katayama

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Electrochemical deposition and dissolution of Li metal on a carbon fiber composite electrode were investigated in lithium bis(trifluoromethylsulfonyl)amide-tetraglyme solvate ionic liquid electrolyte. The carbon fiber composite coated on a Cu substrate was composed of vapor-grown carbon fiber (VGCF®-H) and poly(vinylidene fluoride). The coulombic efficiency for dissolution of Li deposits on the VGCF®-H modified Cu electrode was kept more than 98% at 100th cycle and higher than that on a Cu electrode in the solvate ionic liquid. Li was deposited in the porous structure of the VGCF®-H modified Cu electrode and scarcely observed on the surface of the VGCF®-H modified Cu probably because the overpotential for the reduction of Li is smaller on the Cu substrate and/or deposited Li than that on the cylindrical basal plane of VGCF®-H. This result suggests that the voids in the carbon fiber network effectively act as the Li deposition sites at the electrode|separator interface in the coin cell.

Original languageEnglish
Pages (from-to)667-670
Number of pages4
JournalElectrochemistry
Volume85
Issue number10
DOIs
Publication statusPublished - 2017

Keywords

  • Dendrite
  • Ionic Liquid
  • Lithium Metal
  • Lithium-sulfur Battery

ASJC Scopus subject areas

  • Electrochemistry

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