Solid Halide Electrolytes with High Lithium‐Ion Conductivity for Application in 4 V Class Bulk‐Type All‐Solid‐State Batteries. Issue 44 (14th September 2018)

• Record Type: Journal Article
• Authors: Asano, Tetsuya; Sakai, Akihiro; Ouchi, Satoru; Sakaida, Masashi; Miyazaki, Akinobu; Hasegawa, Shinya
• Is Part Of: Advanced materials. Volume 30:Issue 44(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-09-14
• Subjects: all‐solid‐state batteries -- halide solid electrolytes -- lithium‐ion conductors -- solid‐state ionics -- yttrium halides; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201803075
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: New lithium halide solid‐electrolyte materials, Li3 YCl6 and Li3 YBr6, 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 LiCoO2 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. Abstract : New lithium halide solid‐electrolytes, Li3 YCl6 and Li3 YBr6, are found to exhibit high lithium‐ion conductivity and show excellent performance of a bulk‐type all‐solid‐state battery with 4 V class cathode materials. This study demonstrates that halide materials are candidate materials in addition to sulfides for solid‐state electrolytes for large‐scale all‐solid‐state battery applications.