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Cathode electrolyte interface enabling stable Li–S batteries

Journal Article · · Energy Storage Materials
 [1];  [2];  [2];  [2];  [2];  [2]
  1. Univ. of California, San Diego, CA (United States); DOE/OSTI
  2. Univ. of California, San Diego, CA (United States)
A high-concentration, ether-based electrolyte with LiTFSI and LiNO3 as the co-salts is proposed, which enables stable cycling of a lithium metal battery using sulfurized polyacrylonitrile (SPAN) as the cathode material. In addition to providing excellent protection for lithium metal anodes by forming the solid electrolyte interface (SEI), the electrolyte promotes the formation of a crystalline cathode electrolyte interface (CEI) on the SPAN surface composed of LiF and LiNO2. The CEI effectively prevents the formation of soluble polysulfide species and enables stable cycling of the Li-SPAN battery. The benefit of having effective CEI and SEI layers is also demonstrated in Li-SPAN cells with limited lithium supply, which exhibit lithium cycling efficiency values consistent with or exceeding Li/Cu test results, reaching 99.5%. In conclusion, the development of electrolyte chemistries to enable the formation of effective CEI layers is a promising approach to long-life lithium metal batteries.
Research Organization:
Univ. of California, San Diego, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)
Grant/Contract Number:
EE0007764
OSTI ID:
1614049
Journal Information:
Energy Storage Materials, Journal Name: Energy Storage Materials Journal Issue: C Vol. 21; ISSN 2405-8297
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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