Application of quasi-solid-state silica nanoparticles-ionic liquid composite electrolytes to all-solid-state lithium secondary battery

Seitaro Ito, Atsushi Unemoto, Hideyuki Ogawa, Takaaki Tomai, Itaru Honma

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

Even though the use of solid-state electrolytes for all-solid-state lithium battery applications has been a topic of great interest, an optimal material for this purpose has not been found. On the basis of the fact that ionic liquids are solidified at oxide particle surfaces and become quasi-solid materials, we previously fabricated a new lithium-ion-conducting solid electrolyte material comprising silica nano-particles and an ionic liquid that exhibited high ion conductivity comparable to the bulk ionic liquid. In the current study, this electrolyte was applied in the fabrication of an all-solid-state lithium secondary battery cell, by using three-dimensional structural cathode mixing the solid electrolyte and a cathode material (LiCoO 2). The most important feature of the newly developed cell is that it was fabricated using thick films. There are no prior reports of all-solid-state secondary batteries employing thick films that exhibit high capacity. In this design, all of the cathode active materials could make contact with the electrolyte and the electron-conducting material despite the all-solid-state nature of the device. As a result, we have succeeded in the fabrication of an all-solid-state lithium secondary battery exhibiting high capacity of 126 mAh g -1, nearly equal to theoretical capacity 138 mAh g -1, despite the use of a micrometer order thick-film device. This study paves the way for the application of a new approach to the all-solid-state lithium secondary battery design.

Original languageEnglish
Pages (from-to)271-275
Number of pages5
JournalJournal of Power Sources
Volume208
DOIs
Publication statusPublished - 2012 Jun 15

Keywords

  • All solid state
  • Ionic liquid
  • Lithium
  • Secondary battery
  • Silica

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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