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A Versatile Li 6.5 In 0.25 P 0.75 S 5 I Sulfide Electrolyte Triggered by Ultimate‐Energy Mechanical Alloying for All‐Solid‐State Lithium Metal Batteries
Author(s) -
Jiang Zhao,
Peng Hongling,
Liu Yu,
Li Zhongxu,
Zhong Yu,
Wang Xiuli,
Xia Xinhui,
Gu Changdong,
Tu Jiangping
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202101521
Subject(s) - electrolyte , materials science , ionic conductivity , conductivity , sulfide , chemical engineering , battery (electricity) , lithium (medication) , fast ion conductor , ionic bonding , doping , inorganic chemistry , ion , electrode , thermodynamics , chemistry , metallurgy , organic chemistry , optoelectronics , engineering , endocrinology , medicine , power (physics) , physics
Sulfide solid electrolytes (SSEs) have captured plentiful interest on account of their high ionic conductivity and appropriate mechanical strength. However, the poor air stability and cost‐intensive preparation process of SSEs limit their applications. Herein, a novel ultimate‐energy mechanical alloying (UEMA) approach is applied to rapidly synthesize the argyrodite‐type electrolytes in a one‐pot process. According to the hard‐soft‐acid‐base theory and the first‐principles density functional theory (DFT) calculation, In‐doping in Li 6 PS 5 I is attempted to enhance air stability and the experimental results demonstrate the success of this approach. The synthesized Li 6.5 In 0.25 P 0.75 S 5 I electrolyte has a high ionic conductivity (1.06 mS cm –1 ), and also presents excellent interfacial stability against Li metal, benefiting from the formation of a LiI‐rich interphase layer. The assembled Li–S battery with Li 6.5 In 0.25 P 0.75 S 5 I as an interlayer delivers a high discharge capacity (954 mAh g –1 ) and presents the capacity retention of 96% after 200 cycles. The In‐doped Li 6 PS 5 I is a novel promising electrolyte with high air stability and ionic conductivity for the application of all‐solid‐state lithium metal batteries.