Room temperature operation of all-solid-state battery using a closo-type complex hydride solid electrolyte and a LiCoO2 cathode by interfacial modification

Sangryun Kim, Kentaro Harada, Naoki Toyama, Hiroyuki Oguchi, Kazuaki Kisu, Shin ichi Orimo

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We report on an all-solid-state battery that employs a closo-type complex hydride solid electrolyte and a LiCoO2 cathode. Interfacial modification between the solid electrolyte and cathode with a LiNbO3 buffer layer enables reversible charge-discharge cycling with a cell voltage of 3.9 V (vs. Li+/Li) at room temperature. Electrochemical analyses clarify that the given modification effectively suppresses side reactions at the cathode/solid electrolyte interface. The interfacial resistance is lowered by ca. 10 times with a 5 nm thick LiNbO3 buffer layer compared to that without a buffer layer, so that a discharge capacity of 109 mAh g−1 is achieved. These results suggest that interfacial modification can be a viable approach to the development of high-voltage all-solid-state batteries using closo-type complex hydride solid electrolytes and oxide cathodes.

Original languageEnglish
Pages (from-to)47-51
Number of pages5
JournalJournal of Energy Chemistry
Volume43
DOIs
Publication statusPublished - 2020 Apr
Externally publishedYes

Keywords

  • All-solid-state batteries
  • Closo-type complex hydride
  • High-voltage cathodes
  • Interfacial modification
  • Solid electrolyte

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Electrochemistry

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