Single-phase local-high-concentration solid polymer electrolytes for lithium-metal batteries
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- University of Maryland, College Park, MD (United States)
- Argonne National Laboratory (ANL), Argonne, IL (United States); University of Illinois Chicago, IL (United States)
- University of Saskatchewan, Saskatoon (Canada)
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- University of Rhode Island, Kingston, RI (United States)
Solid polymers are promising electrolytes for Li-metal batteries, but they have limitations: they cannot simultaneously achieve high ionic conductivity, good mechanical strength and compatibility with high-voltage cathodes while suppressing Li dendrites. Here, we design a class of locally high-concentration solid polymer electrolytes based on polymer blends, which are termed Li-polymer in F diluter (LPIFD). The Li-polymer (polymer-in-salt) ensures continuous Li-ion conduction channels and contributes to the solid electrolyte interphase (SEI), and the F diluter (inert fluorinated polymer) adds mechanical strength. Studies reveal that a single-phase LPIFD, which is based on a miscible polymer blend, lacks phase boundaries and forms an organic-less and LiF-rich SEI, effectively suppressing lithium dendrites. The single-phase LPIFD delivers ionic conductivity of 3.0 x 10-4 S cm-1 and enables the Li anode to reach a high coulombic efficiency of 99.1% and a critical current density of 3.7 mA cm-2. Furthermore, the ability to form an F-rich cathode electrolyte interphase allows LiNi0.8Co0.1Mn0.1O2||Li cells to achieve a cycle life of 450 cycles at a high operating voltage of 4.5 V. In conclusion, this design will inspire efforts to commercialize polymer electrolytes for high-energy Li-metal batteries.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); University of Maryland, College Park, MD (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); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC05-76RL01830; EE0008856; EE0009183; SC0012704
- OSTI ID:
- 2283303
- Report Number(s):
- BNL--225238-2024-JAAM
- Journal Information:
- Nature Energy, Journal Name: Nature Energy Vol. 9; ISSN 2058-7546
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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