Designing polymer coatings for lithium metal protection

Zhou, Hongyao; Liu, Ping

doi:10.1088/1361-6528/ac3fe2

Designing polymer coatings for lithium metal protection

Journal Article · 23 December 2021 · Nanotechnology

DOI:https://doi.org/10.1088/1361-6528/ac3fe2· OSTI ID:1979297

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Abstract Protection of lithium metal has been one of the great challenges to realize a long-life, high-energy-density battery. Polymer coatings on lithium metal surface have been proven to be an effective protection method in terms of improved morphology, higher coulombic efficiency, and a longer cycle life. However, there is a variety of design principles of polymer coatings proposed by the research community, and the influence of polymer swelling in liquid electrolytes remains poorly understood. Herein we use crosslinking density and solvent–polymer interaction to quantitatively explain the mechanical property and the ion-transport property of polymer coatings when swollen in liquid electrolytes. Low crosslinking density is beneficial for reducing the rigidity and enhancing the viscosity of the polymer. Ion conductivity increases with the swelling ratio, and activation energy of lithium-ion transport increases in a polar polymer with strong ion–polymer coupling. We propose that polymer coatings must be combined with the emerging electrolytes with unconventional solvent compositions to realize a practical high-performance lithium metal battery. This study can provide design guidelines for polymer coatings through the optimized interactions with upcoming high-performance electrolytes.

Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

DOE Contract Number:: EE0007764

OSTI ID:: 1979297

Journal Information:: Nanotechnology, Vol. 33, Issue 11; ISSN 0957-4484

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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