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 and Shin-ichi Orimo ()
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Sangryun Kim: Tohoku University
Hiroyuki Oguchi: Tohoku University
Naoki Toyama: Tohoku University
Toyoto Sato: Tohoku University
Shigeyuki Takagi: Tohoku University
Toshiya Otomo: High Energy Accelerator Research Organization
Dorai Arunkumar: Tohoku University
Naoaki Kuwata: Tohoku University
Junichi Kawamura: Tohoku University
Shin-ichi Orimo: Tohoku University

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: 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 ( 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.

Date: 2019
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DOI: 10.1038/s41467-019-09061-9

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