能源化学(英文版) ›› 2020, Vol. 41 ›› Issue (2): 87-92.DOI: 10.1016/j.jechem.2019.04.024

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High rate and cycling stable Li metal anodes enabled with aluminum-zinc oxides modified copper foam

Songtao Lua, Zhida Wanga,c, He Yana, Rui Wanga, Ke Luc, Yingwen Chengc, Wei Qinb, Xiaohong Wua   

  1. a MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China;
    b School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China;
    c Department of Chemistry and Biochemistry, Northern Illinois University, Dekalb 60115, IL, United States
  • 收稿日期:2019-02-10 修回日期:2019-04-17 出版日期:2020-02-15 发布日期:2020-12-18
  • 基金资助:
    The financial supports of the National Natural Science Foundation of China (Grant Nos. 51572060, 51702067 and 51671074), Special Financial Grant from the China Postdoctoral Science Foundation (No. 2017T100239) and General Financial Grant from the China Postdoctoral Science Foundation(No. 2016M590279). Y.C. acknowledges the startup grants from Northern Illinois University.

High rate and cycling stable Li metal anodes enabled with aluminum-zinc oxides modified copper foam

Songtao Lua, Zhida Wanga,c, He Yana, Rui Wanga, Ke Luc, Yingwen Chengc, Wei Qinb, Xiaohong Wua   

  1. a MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China;
    b School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China;
    c Department of Chemistry and Biochemistry, Northern Illinois University, Dekalb 60115, IL, United States
  • Received:2019-02-10 Revised:2019-04-17 Online:2020-02-15 Published:2020-12-18
  • Contact: Songtao Lu, Yingwen Cheng, Xiaohong Wu
  • Supported by:
    The financial supports of the National Natural Science Foundation of China (Grant Nos. 51572060, 51702067 and 51671074), Special Financial Grant from the China Postdoctoral Science Foundation (No. 2017T100239) and General Financial Grant from the China Postdoctoral Science Foundation(No. 2016M590279). Y.C. acknowledges the startup grants from Northern Illinois University.

摘要: Metallic Li is a promising anode material for high energy density batteries but it suffers from poor stability and formation of unsafe dendrites. Previous studies demonstrated that 3D metal foams are able to improve the stability of Li metal but the properties of these foams are inherently limited. Here we report a facile surface modification approach via magnetron sputtering of mixed oxides that effectively modulate the properties of Cu foams for supporting Li metal with remarkable stability. We discovered that hybrid Li anodes with Li metal thermally infused to aluminum-zinc oxides (AZO) coated Cu foams have significantly improved stability and reactivity compared with pristine Li foils and Li infused to unmodified Cu foams. Full cells assembled with a LiFePO4 cathode and a hybrid anode maintained low and stable charge-transfer resistance (<50 Ω) during 500 cycles in carbonate electrolytes, and exhibited superior rate capability (~100 mAh g-1 at 20 C) along with better electrochemical reversibility and surface stability. The AZO modified Cu foams had superior mechanical strength and afforded the hybrid anodes with minimized volume change without the formation of dendrites during battery cycling. The rational construction of surface architecture to precisely control Li plating and stripping may have great implications for the practical applications of Li metal batteries.

关键词: Composite Li anode, Metal foams, Surface modification, Li metal batteries, 3D current collector

Abstract: Metallic Li is a promising anode material for high energy density batteries but it suffers from poor stability and formation of unsafe dendrites. Previous studies demonstrated that 3D metal foams are able to improve the stability of Li metal but the properties of these foams are inherently limited. Here we report a facile surface modification approach via magnetron sputtering of mixed oxides that effectively modulate the properties of Cu foams for supporting Li metal with remarkable stability. We discovered that hybrid Li anodes with Li metal thermally infused to aluminum-zinc oxides (AZO) coated Cu foams have significantly improved stability and reactivity compared with pristine Li foils and Li infused to unmodified Cu foams. Full cells assembled with a LiFePO4 cathode and a hybrid anode maintained low and stable charge-transfer resistance (<50 Ω) during 500 cycles in carbonate electrolytes, and exhibited superior rate capability (~100 mAh g-1 at 20 C) along with better electrochemical reversibility and surface stability. The AZO modified Cu foams had superior mechanical strength and afforded the hybrid anodes with minimized volume change without the formation of dendrites during battery cycling. The rational construction of surface architecture to precisely control Li plating and stripping may have great implications for the practical applications of Li metal batteries.

Key words: Composite Li anode, Metal foams, Surface modification, Li metal batteries, 3D current collector