Microstructural analyses of all-solid-state Li–S batteries using LiBH4-based solid electrolyte for prolonged cycle performance

Kazuaki Kisu, Sangryun Kim, Ryuga Yoshida, Hiroyuki Oguchi, Naoki Toyama, Shin ichi Orimo

Research output: Contribution to journalArticle

Abstract

Complex hydride materials have been widely investigated as potential solid electrolytes because they have good compatibility with the lithium metal anodes used in all-solid-state batteries. However, the development of all-solid-state batteries utilizing complex hydrides has been difficult as these cells tend to have short cycle lives. This study investigated the capacity fading mechanism of all-solid-state lithium–sulfur (Li–S) batteries using Li4(BH4)3I solid electrolytes by analyzing the cathode microstructure. Cross-sectional scanning electron microscopy observations after 100 discharge–charge cycles revealed crack formation in the Li4(BH4)3I electrolyte and an increased cathode thickness. Raman spectroscopy indicated that decomposition of the Li4(BH4)3I solid electrolyte occurred at a constant rate during the cycling tests. To combat these effects, the cycle life of Li–S batteries was improved by increasing the amount of solid electrolyte in the cathode.

Original languageEnglish
Pages (from-to)424-429
Number of pages6
JournalJournal of Energy Chemistry
Volume50
DOIs
Publication statusPublished - 2020 Nov
Externally publishedYes

Keywords

  • All-solid-state battery
  • Complex hydride solid electrolyte
  • Li metal anode
  • Li–S battery
  • Microstructure

ASJC Scopus subject areas

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

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