Electrochemical and interfacial behavior of all solid state batteries using Li10SnP2S12 solid electrolyte

JOURNAL OF POWER SOURCES

卷:396

Article

Vinado, Carolina¹  Wang, Shanyu¹  He, Yang³  Xiao, Xingcheng²  Li, Yun¹  Wang, Chongmin³  Yang, Jihui¹ 

[1] Univ Washington, Mat Sci & Engn Dept, Seattle, WA 98195 USA

[2] Gen Motors R&D Ctr, Chem Sci & Mat Syst Lab, Warren, MI 48090 USA

[3] Pacific Northwset Natl Lab, Environm Mol Sci Lab, Richland, WA 99354 USA

关键词: Li10SnP2S12;    All-solid-state battery;    Solid electrolyte;    Atomic layer deposition;    Interfacial stability;   

DOI  :  10.1016/j.jpowsour.2018.06.038

来源: Elsevier

【 摘 要 】

Thio-Lithium Superionic Conductor (Thio-LISICON) Li10GeP2S12 equivalent Li10SnP2S12 (LSPS) is comparable in ionic conductivity yet with a lower cost as an electrolyte for all solid-state batteries (ASSBs). ASSBs with LSPS solid electrolyte (SE), lithium-indium alloy anode, and LiCoO2 (LCO) cathode were successfully fabricated and their electrochemical performance at 60 degrees C was examined. Atomic layer deposition of Li3NbO4 on LCO was conducted to improve the interfacial stability. The Li3NbO4 coating effectively improves the cycle stability of the ASSB. Electrochemical impedance spectroscopy tests indicate a rapid growth of charge transfer resistance upon cycling for the cell with the uncoated LCO, primarily due to the surface instability and build-up of a space charge layer. However, the ASSBs with Li3NbO4 coated LCO show a more stable interface with a negligible impedance increase upon cycling, attributable to the buffering and passivating roles of the Li3NbO4 coating. The interfacial microstructure was analyzed to elucidate at the underlying reasons for the impedance increase and the pivotal role of the Li3NbO4 coating.

【 授权许可】

Free