Journal
NANO LETTERS
Volume 20, Issue 11, Pages 8273-8281Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03395
Keywords
interfacial layer; composite solid electrolyte; lithium metal batteries; amorphous sulfide
Categories
Funding
- Chinese Postdoctoral Science Foundation [2019M653601]
- National Nature Science Foundation of China [21905220, 61874146, 21803005]
- Fundamental Research Funds for the Young Talent Support Plan of Xi'an Jiaotong University [HG6J003]
- Shaanxi Joint Laboratory of Graphene (NPU)
- 1000-Plan Program of Shaanxi Province
- Singapore Ministry of Education Academic Research Fund [Tier 1 R-279-000-550-133]
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A novel strategy has been proposed to produce in situ Li2S at the interfacial layer between lithium anode and the solid electrolyte, by using an amorphous-sulfide-LiTFSI-poly-(vinylidene difluoride) (PVDF) composite solid electrolyte (SLCSE). Besides retarding the decomposition of PVDF in CSE, the Li2S-modified interfacial layer (SMIL) also improves the wettability between lithium metal and SLCSE which in turn optimizes the lithium deposition process. Our density functional theory calculation results reveal that the migration energy barrier of Li passing through SMIL is much lower than that of Li passing through LiF-modified interfacial layer (FMIL) formed from the decomposition of PVDF. The as-prepared SLCSE shows a Li ionic transference number of 0.44 and Li ion conductivity of 3.42 X 10(-4) S/cm at room temperature, and the LiIISLCSEIlLiFePO(4) cell exhibits an outstanding rate performance with a capacity of 153, 144, 131, and 101 mAh/g at a current density of 0.05, 0.10, 0.25, and 0.50 mA/cm(2), respectively.
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