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Title: Single-phase local-high-concentration solid polymer electrolytes for lithium-metal batteries

Journal Article · · Nature Energy
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  1. University of Maryland, College Park, MD (United States)
  2. Argonne National Laboratory (ANL), Argonne, IL (United States); University of Illinois Chicago, IL (United States)
  3. University of Saskatchewan, Saskatoon (Canada)
  4. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  5. 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); Univ. of Maryland, College Park, MD (United States)
Sponsoring Organization:
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); National Science Foundation (NSF)
Grant/Contract Number:
SC0012704; EE0008856; AC05-76RL01830; EE0009183; NSF-1726058
OSTI ID:
2283303
Report Number(s):
BNL-225238-2024-JAAM
Journal Information:
Nature Energy, Journal Name: Nature Energy; ISSN 2058-7546
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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