In situ formation of polymer-inorganic solid-electrolyte interphase for stable polymeric solid-state lithium-metal batteries

Deng, Tao; Cao, Longsheng; He, Xinzi; Li, Ai-Min; Li, Dan; Xu, Jijian; Liu, Sufu; Bai, Panxing; Jin, Ting; Ma, Lin; Schroeder, Marshall A.; Fan, Xiulin; Wang, Chunsheng

doi:10.1016/j.chempr.2021.06.019

DOE OSTI · 1976954

In situ formation of polymer-inorganic solid-electrolyte interphase for stable polymeric solid-state lithium-metal batteries

Deng, Tao·Cao, Longsheng·He, Xinzi·Li, Ai-Min·Li, Dan·Xu, Jijian·Liu, Sufu·Bai, Panxing·Jin, Ting·Ma, Lin·Schroeder, Marshall A.·Fan, Xiulin·Wang, Chunsheng

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Abstract

Composite polymer electrolytes (CPEs) for solid-state Li-metal batteries (SSLBs) still suffer from gradually increased interface resistance and unconstrained Li-dendrite growth. Herein, we addressed the challenges by designing a LiF-rich inorganic solid-electrolyte interphase (SEI) through introducing a fluoride-salt-concentrated interlayer on CPE film. The rigid but flexible CPE helps accommodate the volume change of electrodes, while the polymeric highly concentrated electrolyte (PHCE) surface-layer regulates Li-ion flux due to the formation of a stable LiF-rich SEI via anion reduction. The designed CPE-PHCE presents enhanced ionic conductivity and high oxidation stability of >5.0 V (versus Li/Li + ). Furthermore, it dramatically reduces the interfacial resistance and achieves a high critical current density of 4.5 mA cm –2 . The SSLBs, fabricated with thin CPE-PHCE membranes (<100 μm) and Co-free LiNiO 2 cathodes, exhibit exceptional electrochemical performance and long cycling stability. Lastly, this approach of SEI design can also be applied to other types of batteries.

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25 ENERGY STORAGE Chemistry composite polymer electrolyte interfacial chemistry lithium batteries lithium dendrite solid-electrolyte interphase

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Deng, Tao, Cao, Longsheng, He, Xinzi, Li, Ai-Min, Li, Dan, Xu, Jijian, Liu, Sufu, Bai, Panxing, Jin, Ting, Ma, Lin, Schroeder, Marshall A., Fan, Xiulin, Wang, Chunsheng. 2021-07-12. In situ formation of polymer-inorganic solid-electrolyte interphase for stable polymeric solid-state lithium-metal batteries. https://doi.org/10.1016/j.chempr.2021.06.019

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