Bismuth-Contained Lithiophilic Protective Layer on Lithium Metal Anode In Situ Generated via Electrochemical Method

Yulong Shao, Yinping Qin, Yingying Song, Kaiyun Xu, Hefeng Wang, Cai Shen, Riming Chen, Yingchun Lyu, Yang Liu, Bingkun Guo

    Research output: Journal PublicationArticlepeer-review

    Abstract

    Lithium metal anode (LMA) faces the challenge of poor electrochemical performances in the exfoliation of the interfacial protective layer from the anode, which is caused by the dramatic volumetric variation of the lithium metal during cycling. In this work, a bismuth-contained lithiophilic protective layer was spontaneously formed on the Li metal by the Bi(TFSI)3 salt additive. The protective layer formed via electrochemical way is relatively dense and homogeneous with a small size of ∼38 nm Li3Bi alloy and abundant LiF. This layer shows excellent property of uniform lithium deposition and displays enough mechanical strength with the Young's modulus of ∼6 GPa to suppress Li dendrite growth and reduces the interfacial side reactions. Utilized in LiFePO4/Li cells, the cyclic performance has been improved with the retention capacity of ∼70.6% in 300 cycles.

    Original languageEnglish
    Pages (from-to)11493-11500
    Number of pages8
    JournalACS Sustainable Chemistry and Engineering
    Volume10
    Issue number35
    DOIs
    Publication statusPublished - 5 Sep 2022

    Keywords

    • Bi(TFSI)
    • electrolyte additive
    • fluoride-rich
    • Li metal
    • Protective layer

    ASJC Scopus subject areas

    • Chemistry (all)
    • Environmental Chemistry
    • Chemical Engineering (all)
    • Renewable Energy, Sustainability and the Environment

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