Journal
JOURNAL OF POWER SOURCES
Volume 396, Issue -, Pages 764-773Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2018.06.096
Keywords
Lithium garnet; Interfacial engineering; Lithium metal battery; High energy density
Funding
- Ministry of Heavy Industries, Government of India [7/1/2013-AEI]
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Li7La3Zr2O12 (LLZ) is one of the most promising solid electrolyte for all-solid-state batteries, owing to its high Li + conductivity and stability when in contact with lithium metal. However, LLZ has its own challenges in realizing high performance due to its high electrode/electrolyte interfacial resistance. To address this issue, we report a systematic investigation of interfacial resistance, with a metallic Li strip and a thin layer of Li deposition by thermal evaporation (TE) over dense and high Li + conductive pristine Al-LLZ (Li6.28Al0.24La3Zr2O12) and Au?Al-LLZ. Thermal treatment of Li (TE)?Au?Al-LLZ?Au?Li (TE) at 180 degrees C for 1-h exhibits a dramatic reduction in interfacial resistance along with stable Li platting/stripping at room temperature (25 degrees C). Scanning Electron Microscopic (SEM) investigation on the interface of the Li (TE)?Au?Al-LLZ?Au?Li (TE) reveals the formation of a favorable thin layer of Li-Au alloy through the heat treatment at 180 degrees C. A room temperature working cell with LiCoO2 as a cathode, metallic Li (TE) as anode and Al-LLZ as a solid electrolyte is possible by introducing a thin layer of Au at anode interface and a soft polypropylene interlayer at cathode interface.
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