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Realizing stable lithium deposition by in-situ grown Cu2S nanowires inside commercial Cu foam for lithium metal anodes

Abstract

Lithium metal is the most promising anode for next-generation rechargeable lithium batteries but Li dendrite growth and the resulting safety issues resulting from the non-uniform Li deposition hinder its practical use. Considering the high cost and complication of the currently reported approaches to suppress the Li dendrite growth, in this study we have modified a low-cost commercial three-dimensional (3D) Cu foam into a high-performance host for stable Li deposition by the growth of Cu2S nanowires (NWs) inside the Cu framework. The Cu2S NWs were grown by a simple and scalable chemical approach, and they reduce the local current density and homogenize the Li ion distribution because of the increased contact area of the 3D Cu2S NWs/Cu with the electrolyte. They also enable the formation of a protective solid electrolyte interphase (SEI) film containing Li2S2/Li2S. The prepared 3D Cu2S NWs/Cu current collector enables dendrite-free Li deposition/stripping and gives a stable cycling performance with a high Coulombic efficiency (95.5 % for more than 150 cycles at 2 mA cm-2). Full cells with LiFePO4 as the cathode also exhibit improved cycling stability and improved Coulombic efficiency, showing the potential of this host in the use of stable Li metal anodes.

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Publication details

The article was received on 27 Oct 2018, accepted on 06 Dec 2018 and first published on 06 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10341K
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Realizing stable lithium deposition by in-situ grown Cu2S nanowires inside commercial Cu foam for lithium metal anodes

    Z. Huang, C. Zhang, W. Lv, G. Zhou, Y. Zhang, Y. Deng , H. Wu, F. Kang and Q. H. Yang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA10341K

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