Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
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Fabrication of LiCoO2 Composite Electrodes for All-solid-state Li Secondary Batteries via Liquid Sintering Using Porous La2/3−xLi3xTiO3 Substrates
Hijiri OIKAWAYuta YOSHIDATakanori YAMAMOTOYoshinori ARACHI
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2022 年 90 巻 6 号 p. 067003

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Porous La2/3−xLi3xTiO3 (LLTO) for use as a Li ion conducting framework was prepared on sintered Li0.29La0.57TiO3 bodies using either polyvinylpyrrolidone-assisted sol-gel or screen-printing methods. A mixture of Li and Co salts was subsequently applied to this porous material followed by heating at 700 °C for 1 h to obtain LiCoO2 (LCO)-LLTO composite positive electrodes. These electrodes were subsequently assessed as components of all-solid-state Li secondary batteries (ASSBs). The effect of the amount of LCO loading on the electrochemical performance of these devices was evaluated, based on charge-discharge testing of ASSBs made by inserting Li3.25Ge0.25P0.75S4 between the LLTO and an In-Li alloy negative electrode. The porous LLTO permitted efficient utilization of the active material, and LCO loadings ranging from 1.1 to 6.5 mg cm−2 were possible, with a maximum capacity of 0.65 mAh cm−2. The electrochemical activity of 1 to 2 µm thick LCO layers prepared from molten salts on LLTO was confirmed in this work and LCO was demonstrated to function effectively as a component of a composite positive electrode. This synthesis using liquid sintering with molten salts is a promising approach to forming active electrochemical interfaces between oxides.

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© The Author(s) 2022. Published by ECSJ.

This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium provided the original work is properly cited. [DOI: 10.5796/electrochemistry.22-00043].
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