材料科学
成核
金属锂
阳极
枝晶(数学)
金属
锂(药物)
电解质
相间
化学工程
电化学
纳米技术
集电器
电极
冶金
热力学
物理化学
物理
工程类
内分泌学
化学
生物
医学
遗传学
数学
几何学
作者
Zheng Luo,Cheng Liu,Ye Tian,Yang Zhang,Yunling Jiang,Junhua Hu,Hongshuai Hou,Guoqiang Zou,Xiaobo Ji
标识
DOI:10.1016/j.ensm.2020.01.025
摘要
Abstract In the development of rechargeable Li metal batteries, current collectors with high porosity, rational pore structure and lithiophilic skeleton are essentially needed to suppress Li dendrite and accommodate the volume variation. Herein, 3D hierarchical porous collector activated from chemical dealloying of brass mesh is elaborately decorated with highly lithiophilic Sn layer via electroless plating method for dendrite-free Li metal anode. During Li plating process, the nucleation overpotential is remarkably reduced with the in-situ electrochemically generated Li–Sn alloy, realizing uniform Li nucleation/growth. Meanwhile, unique hierarchical porous structure with a high porosity of 60.2% ensures well dispersed current density for homogeneous Li deposition and accommodation. As expected, a high coulombic efficiency above 98% for 240 cycles at 1 mA cm−2 and a prolonged lifespan of symmetrical cells for 800 h at 1 mA cm−2 with lower polarization are achieved, which further renders the LiFePO4 based full cells with improved capacity retention up to 92.9% after 200 cycles at 0.5C. This work proposes a highly effective strategy to realize dendrite-free Li metal anode.
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