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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
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 .