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European Journal of Inorganic Chemistry
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A Strategy to Improve the Overall Performance of the Lithium Ion‐Conducting Solid Electrolyte Li0.36La0.56□0.08Ti0.97Al0.03O3

Yaoming Wang

State Key Laboratory of High Performance Ceramics andSuperfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China, Fax: +86‐21‐52413903

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Zhanqiang Liu

State Key Laboratory of High Performance Ceramics andSuperfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China, Fax: +86‐21‐52413903

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Fuqiang Huang

E-mail address: huangfq@mail.sic.ac.cn

State Key Laboratory of High Performance Ceramics andSuperfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China, Fax: +86‐21‐52413903

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Jianhua Yang

State Key Laboratory of High Performance Ceramics andSuperfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China, Fax: +86‐21‐52413903

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Junkang Sun

State Key Laboratory of High Performance Ceramics andSuperfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China, Fax: +86‐21‐52413903

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First published: 09 December 2008
https://doi.org/10.1002/ejic.200800482
Citations: 2
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Abstract

A strategy to improve the overall performance of the lithium ion‐conducting solid electrolyte (Li‐CSE) Li0.36La0.56□0.08Ti0.97Al0.03O3 (LLTO) is proposed. Thin layers of the electronically insulating, electrochemically stable, and low‐melting Li‐CSE Li3.25Ge0.25P0.75S4 (LGPS) were coated onto LLTO powders, which resulted in oxide/sulfide composite electrolytes. The introduction of LGPS simultaneously brought about drastic reductions in the activation energies and great enhancements of the total ionic conductivities of the composite electrolytes. As the LGPS content was increased from 0 mol‐% to 20 mol‐%, the activation energy decreased steadily from 0.62 eV to 0.34 eV, and accordingly a total ionic conductivity as high as 1.62 × 10–4 S cm–1 was reached, almost the same as those of the excellent oxide‐based Li‐CSE ceramics sintered at extremely high temperatures, and a wide electrochemical window of over 6 V vs. Li+/Li was achieved. In addition, a low electronic conductivity of 2.38 × 10–9 S cm–1 at room temperature for the composite electrolyte was discovered.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)