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Solid Halide Electrolytes with High Lithium‐Ion Conductivity for Application in 4 V Class Bulk‐Type All‐Solid‐State Batteries
Author(s) -
Asano Tetsuya,
Sakai Akihiro,
Ouchi Satoru,
Sakaida Masashi,
Miyazaki Akinobu,
Hasegawa Shinya
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201803075
Subject(s) - materials science , electrolyte , halide , lithium (medication) , fast ion conductor , electrochemistry , faraday efficiency , conductivity , ionic conductivity , lithium vanadium phosphate battery , inorganic chemistry , ion , chemical engineering , electrode , chemistry , organic chemistry , medicine , engineering , endocrinology
New lithium halide solid‐electrolyte materials, Li 3 YCl 6 and Li 3 YBr 6 , are found to exhibit high lithium‐ion conductivity, high deformability, and high chemical and electrochemical stability, which are required properties for all‐solid‐state battery (ASSB) applications, particularly for large‐scale deployment. The lithium‐ion conductivities of cold‐pressed powders surpass 1 mS cm −1 at room temperature without additional intergrain or grain boundary resistances. Bulk‐type ASSB cells employing these new halide solid electrolyte materials exhibit coulombic efficiencies as high as 94% with an active cathode material of LiCoO 2 without any extra coating. These superior electrochemical characteristics, as well as their material stability, indicate that lithium halide salts are another promising candidate for ASSB solid electrolytes in addition to sulfides or oxides.