期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 2, 页码 727-732出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta10341k
关键词
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资金
- National Natural Science Foundation of China [51772164, U1601206]
- Guangdong Special Support Program [2017TQ04C664]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01N111]
- Shenzhen Basic Research Project [JCYJ20170412171359175, JCYJ20170412171630020]
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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