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Ionic Conductivity of Low‐Crystalline Li4P2S6 and Li4P2S6–LiX (X=Cl, Br, and I) Systems and Their Role in Improved Positive Electrode Performance in All‐Solid‐State LiS Battery
Author(s) -
Nagata Hiroshi,
Akimoto Junji
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202002308
Subject(s) - ionic conductivity , electrolyte , conductivity , ionic bonding , lithium (medication) , fast ion conductor , battery (electricity) , materials science , electrode , lithium battery , ion , inorganic chemistry , chemistry , thermodynamics , organic chemistry , medicine , power (physics) , physics , endocrinology
Abstract Solid electrolytes strongly affect the performance of all‐solid‐state lithium‐ion batteries. Therefore, they are required to have high ionic conductivity, interface‐forming ability, and high stability. This study investigates low‐crystalline Li 4 P 2 S 6 and Li 4 P 2 S 6 −LiX (X=Cl, Br, and I) systems as solid electrolytes. The low‐crystalline Li 4 P 2 S 6 exhibits considerably higher ionic conductivity (4.7×10 −5 S cm −1 ) than the highly crystalline Li 4 P 2 S 6 . The Li 4 P 2 S 6 –LiX systems further improve the ionic conductivity while maintaining the P 2 S 6 4− structure. Especially, the 0.4Li 4 P 2 S 6 ⋅ 0.6LiI exhibits a relatively high ionic conductivity of 6.9×10 −4 S cm −1 , despite in low ionic conductive Li 4 P 2 S 6 systems. Furthermore, battery performance of the positive electrode using 0.4Li 4 P 2 S 6 ⋅ 0.6LiI for all‐solid‐state LiS battery considerably improves form that use highly crystalline Li 4 P 2 S 6 .