Controllable Li3PS4-Li4SnS4 solid electrolytes with affordable conductor and high conductivity for solid-state battery

Pingping Dong (1) , Qing Jiao (1) , Zengcheng Zhang (1) , Miao Jiang (2) , Changgui Lin (1) , Xianghua Zhang (3) , Hongli Ma (3) , Baochen Ma (1) , Shixun Dai (1) , Tiefeng Xu (4)

1 NBU - Ningbo University
2 NIT - Ningbo Institute of Technology
3 ISCR - Institut des Sciences Chimiques de Rennes
4 Ningbo Institute of Oceanography

High ionic conductivity, low grain boundary impedance, and stable electrochemical property have become the focus for all-solid-state lithium-sulfur batteries (ASSLSB). One of the approaches is to promote the rapid diffusion of lithium ions by regulating the chemical bond interactions within the framework. The structure control of P5+ substitution for Sn4+ on lithium-ion transport was explored for a series of Li3PS4-Li4SnS4 glass-ceramic electrolytes. Results showed that the grain boundary impedance of the glass electrolyte was reduced after heat treatments. The formation of LiSnPS microcrystals, a good superionic conductor, was detected by X-ray diffraction tests. Electrochemical experiments obtained the highest conductivity of 29.5 S cm(-1) at 100 degrees C and stable electrochemical window from -0.1 to 5 V at 25 degrees C. In addition, the cell battery was assembled with prepared electrolyte, which is promoted as a candidate solid electrolyte material with improved performance for ASSLSB.

Mots clés: all-solid-state batteries; glass ceramics; low grain impedance; sulfide solid electrolyte

Domaines: Chimie

Pingping Dong, Qing Jiao, Zengcheng Zhang, Miao Jiang, Changgui Lin, et al.. Controllable Li3PS4-Li4SnS4 solid electrolytes with affordable conductor and high conductivity for solid-state battery. Journal of the American Ceramic Society, 2022, 105 (5), pp.3252-3260. ⟨10.1111/jace.18287⟩. ⟨hal-03553188⟩