期刊
JOURNAL OF POWER SOURCES
卷 396, 期 -, 页码 824-830出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2018.06.038
关键词
Li10SnP2S12; All-solid-state battery; Solid electrolyte; Atomic layer deposition; Interfacial stability
资金
- Office of Vehicle Technologies of the U.S. Department of Energy under the Advanced Battery Materials Research (BMR) program [DE-AC02-05CH11231, 18769, 6951379]
- DOE's Office of Biological and Environmental Research
- Department of Energy [DE-AC05-76RLO1830]
- Vehicle Technologies Office of the U.S. Department of Energy under the Battery Material Research (BMR) Program [DE-EE0007787]
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.
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