Electrical and mechanical properties of glass and glass-ceramic electrolytes in the system Li3BO3–Li2SO4

Masahiro TATSUMISAGO; Ryohei TAKANO; Masashi NOSE; Kenji NAGAO; Atsutaka KATO; Atsushi SAKUDA; Kiyoharu TADANAGA; Akitoshi HAYASHI

doi:10.2109/jcersj2.17026

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Electrical and mechanical properties of glass and glass-ceramic electrolytes in the system Li₃BO₃–Li₂SO₄

Masahiro TATSUMISAGO, Ryohei TAKANO, Masashi NOSE, Kenji NAGAO, Atsutaka KATO, Atsushi SAKUDA, Kiyoharu TADANAGA, Akitoshi HAYASHI

Author information

Masahiro TATSUMISAGO
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
Ryohei TAKANO
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
Masashi NOSE
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
Kenji NAGAO
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
Atsutaka KATO
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
Atsushi SAKUDA
Department of Energy and Environment, Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST)
Kiyoharu TADANAGA
Department of Materials Chemistry, Faculty of Engineering, Hokkaido University
Akitoshi HAYASHI
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University

Keywords: Solid electrolyte, Ionic glass, Glass-ceramic, All-solid-state battery

JOURNAL FREE ACCESS

2017 Volume 125 Issue 6 Pages 433-437

DOI https://doi.org/10.2109/jcersj2.17026

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Abstract

Low-melting oxide glasses are promising as electrolytes for all-solid-state lithium rechargeable batteries. Glasses in the pseudobinary system Li₃BO₃–Li₂SO₄ were prepared by a mechanochemical technique. Raman spectra revealed that the glasses contained no macroanions which form networks but consisted only of Li⁺ ions and two discrete ortho-oxoanions, BO₃³⁻ and SO₄²⁻. The density and molar volume increased and elastic moduli decreased with an increase in the Li₂SO₄ content in the glasses. The heat treatment of the Li₃BO₃–Li₂SO₄ glasses at around 300°C brought about the crystallization to form ion conducting glass-ceramics. Electrical conductivities of the glasses and glass-ceramics in this system were maximized with the mixing of Li₃BO₃ and Li₂SO₄. The conductivities were higher in the glass-ceramics of the compositions with small amounts of Li₂SO₄, ranging from 3 × 10⁻⁶ to 1 × 10⁻⁵ S cm⁻¹ at room temperature, compared to the corresponding glasses. This conductivity enhancement by the heat treatment is probably due to the precipitation of solid solutions with a high temperature Li₃BO₃ phase.

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