Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 38, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201902125
Keywords
air stable; all-solid-state batteries; Li3PS4; lithium metal anodes; sulfide electrolytes
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Funding
- Natural Science and Engineering Research Council of Canada (NSERC)
- Canada Research Chair Program (CRC)
- Ontario Research Fund
- Canada Foundation for Innovation (CFI)
- China Automotive Battery Research Institute Co.
- Canada Light Source at University of Saskatchewan (CLS)
- University of Western Ontario
- Canada MITACS fellowships
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Li metal is a promising anode material for all-solid-state batteries, owing to its high specific capacity and low electrochemical potential. However, direct contact of Li metal with most solid-state electrolytes induces severe side reactions that can lead to dendrite formation and short circuits. Moreover, Li metal is unstable when exposed to air, leading to stringent processing requirements. Herein, it is reported that the Li3PS4/Li interface in all-solid-state batteries can be stabilized by an air-stable LixSiSy protection layer that is formed in situ on the surface of Li metal through a solution-based method. Highly stable Li cycling for over 2000 h in symmetrical cells and a lifetime of over 100 cycles can be achieved for an all-solid-state LiCoO2/Li3PS4/Li cell. Synchrotron-based high energy X-ray photoelectron spectroscopy in-depth analysis demonstrates the distribution of different components within the protection layer. The in situ formation of an electronically insulating LixSiSy protection layer with highly ionic conductivity provides an effective way to prevent Li dendrite formation in high-energy all-solid-state Li metal batteries.
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