High-power all-solid-state batteries using sulfide superionic conductors

Yuki Kato (), Satoshi Hori, Toshiya Saito, Kota Suzuki, Masaaki Hirayama, Akio Mitsui, Masao Yonemura, Hideki Iba and Ryoji Kanno ()
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Yuki Kato: Higashifuji Technical Center, Toyota Motor Corporation
Satoshi Hori: Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
Toshiya Saito: Higashifuji Technical Center, Toyota Motor Corporation
Kota Suzuki: Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
Masaaki Hirayama: Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
Akio Mitsui: Toyota Motor Corporation
Masao Yonemura: Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK)
Hideki Iba: Higashifuji Technical Center, Toyota Motor Corporation
Ryoji Kanno: Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

Nature Energy, 2016, vol. 1, issue 4, 1-7

Abstract: Abstract Compared with lithium-ion batteries with liquid electrolytes, all-solid-state batteries offer an attractive option owing to their potential in improving the safety and achieving both high power and high energy densities. Despite extensive research efforts, the development of all-solid-state batteries still falls short of expectation largely because of the lack of suitable candidate materials for the electrolyte required for practical applications. Here we report lithium superionic conductors with an exceptionally high conductivity (25 mS cm−1 for Li9.54Si1.74P1.44S11.7Cl0.3), as well as high stability ( ∼0 V versus Li metal for Li9.6P3S12). A fabricated all-solid-state cell based on this lithium conductor is found to have very small internal resistance, especially at 100 ∘C. The cell possesses high specific power that is superior to that of conventional cells with liquid electrolytes. Stable cycling with a high current density of 18 C (charging/discharging in just three minutes; where C is the C-rate) is also demonstrated.

Date: 2016
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DOI: 10.1038/nenergy.2016.30

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