A complex hydride lithium superionic conductor for high-energy-density all-solid-state lithium metal batteries

Sangryun Kim, Hiroyuki Oguchi, Naoki Toyama, Toyoto Sato, Shigeyuki Takagi, Toshiya Otomo, Dorai Arunkumar, Naoaki Kuwata, Junichi Kawamura, Shin ichi Orimo

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

All-solid-state batteries incorporating lithium metal anode have the potential to address the energy density issues of conventional lithium-ion batteries that use flammable organic liquid electrolytes and low-capacity carbonaceous anodes. However, they suffer from high lithium ion transfer resistance, mainly due to the instability of the solid electrolytes against lithium metal, limiting their use in practical cells. Here, we report a complex hydride lithium superionic conductor, 0.7Li(CB9H10)–0.3Li(CB11H12), with excellent stability against lithium metal and a high conductivity of 6.7 × 10−3 S cm−1 at 25 °C. This complex hydride exhibits stable lithium plating/stripping reaction with negligible interfacial resistance (<1 Ω cm2) at 0.2 mA cm−2, enabling all-solid-state lithium-sulfur batteries with high energy density (>2500 Wh kg−1) at a high current density of 5016 mA g−1. The present study opens up an unexplored research area in the field of solid electrolyte materials, contributing to the development of high-energy-density batteries.

Original languageEnglish
Article number1081
JournalNature Communications
Volume10
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Kim, S., Oguchi, H., Toyama, N., Sato, T., Takagi, S., Otomo, T., Arunkumar, D., Kuwata, N., Kawamura, J., & Orimo, S. I. (2019). A complex hydride lithium superionic conductor for high-energy-density all-solid-state lithium metal batteries. Nature Communications, 10(1), [1081]. https://doi.org/10.1038/s41467-019-09061-9