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Adv Mater. 2018 Mar;30(9). doi: 10.1002/adma.201705830. Epub 2018 Jan 12.

Lithiophilic Cu-CuO-Ni Hybrid Structure: Advanced Current Collectors Toward Stable Lithium Metal Anodes.

Author information

1
Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, China.
2
Department of Materials Science and Engineering and Center of Super-Diamond and Advanced Films, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, China.
3
College of Chemistry and Chemical Engineering, Central South University, 932 South Lushan Road, 410083, Changsha, China.

Abstract

Metallic lithium (Li) is a promising anode material for next-generation rechargeable batteries. However, the dendrite growth of Li and repeated formation of solid electrolyte interface during Li plating and stripping result in low Coulombic efficiency, internal short circuits, and capacity decay, hampering its practical application. In the development of stable Li metal anode, the current collector is recognized as a critical component to regulate Li plating. In this work, a lithiophilic Cu-CuO-Ni hybrid structure is synthesized as a current collector for Li metal anodes. The low overpotential of CuO for Li nucleation and the uniform Li+ ion flux induced by the formation of Cu nanowire arrays enable effective suppression of the growth of Li dendrites. Moreover, the surface Cu layer can act as a protective layer to enhance structural durability of the hybrid structure in long-term running. As a result, the Cu-CuO-Ni hybrid structure achieves a Coulombic efficiency above 95% for more than 250 cycles at a current density of 1 mA cm-2 and 580 h (290 cycles) stable repeated Li plating and stripping in a symmetric cell.

KEYWORDS:

lithiophilic materials; lithium metal anodes; lithium nucleation overpotential

PMID:
29327388
DOI:
10.1002/adma.201705830

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