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Constructing nanoporous Ni foam current collectors for stable lithium metal anodes

Journal of Energy Chemistry 2021年第7期30卷 124-132页

作者： Shikun Liu Hongming Zhang Xiaoxu Liu Yu Yang Caixia Chi Shen Wang Junying Xue Tingting Hao Jiupeng Zhao Yao Li School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina School of Material Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021ShaanxiChina Center for Composite Materials and Structure Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

Lithium metal,as the most ideal anode material for high energy density batteries,has been researched for several ***,the dendrite formation and large volume change during repetitive lithium plating/stripping lead to a serious safety issue and impede the practical application of lithium metal ***,a nanoporous Ni foam current collector with high surface area and surface flaws is constructed via a facile oxidation-reduction *** inherent macropore structure of Ni foam can partly accommodate the volume variation during Li plating/*** well-distributed nanopores on the skeleton of Ni foam can effectively reduce the local current density,regulate the uniform lithium nucleation and deposition with homogenous distribution of Li^(+) ***,the surface flaws induce the formation of ring Li structures at initial nucleation/deposition processes and concave Li metal spontaneously formed based on the ring Li structures during cycling,which can direct the even Li plating/***,highly stable Coulombic efficiency is achieved at 1 mA cm^(-2) for 200 *** symmetrical cell,based on the nanoporous Ni foam current collector,presents long lifespans of 1200 and 700 h respectively at different current densities of 0.5 and 1 mA cm^(-2) without short *** addition,the LiFePO4 full cell,with the Li metal anode based on the nanoporous Ni foam current collector,shows excellent cycling performance at 1 C for 300 cycles and rate performance.

关键词： Lithium metal anodes Nanopores Current collector Ni foam stable cycling lifespan

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