3D Porous Cu Current Collectors Derived by Hydrogen Bubble Dynamic Template for Enhanced Li Metal Anode Performance
3D Porous Cu Current Collectors Derived by Hydrogen Bubble Dynamic Template for Enhanced Li Metal Anode Performance
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由氢气泡动态模板衍生的 3D 多孔铜集流体可增强锂金属负极性能
DOI：
10.1002/adfm.201808468
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发表时间：
2019-05-09
影响因子：
19
通讯作者：
Hou, Yanglong
中科院分区：
文献类型：
--
作者：
Qiu, Hailong;Tang, Tianyu;Hou, Yanglong
锂金属是高能密度电池最理想的负极材料。然而，锂金属的高活性、体积变化大、循环过程中锂枝晶的形成阻碍了其实际应用。本文采用简单省时的氢泡动态模板法合成三维多孔铜，作为提高性能的锂金属阳极的载体。与平面铜箔相反，合成的三维多孔结构可以降低局部电流密度，抑制苔藓状/枝晶状锂的生长，缓冲锂金属阳极的体积变化。在不同的比电流密度（0.5,1和2 mA cm(-2)）下，容量为1.0 mAh cm(-2)，实现了高度稳定的库仑效率。此外，即使在3 mA cm（-2）的高电流密度下，对称的Li|Li- 3d Cu电池也表现出更稳定的循环性能和更低的过电位。
Lithium (Li) metal is the most ideal anode material for high-energy density batteries. However, the high activity of Li metal, the large volume change, and Li dendrite formation during cycling hinder its practical application. Herein, 3D porous Cu synthesized through a simple time-saving hydrogen bubble dynamic template method is used as a host for the improved performance Li metal anode. Contrary to the planar Cu foil, the synthesized 3D porous structure can reduce the local current density, suppress the mossy/dendritic Li growth, and buffer the volume change in the Li metal anode. Highly stable Coulombic efficiency is achieved at different specific current densities (0.5, 1, and 2 mA cm(-2)) with a capacity of 1.0 mAh cm(-2). Moreover, symmetrical Li|Li-3D Cu cells show more stable cyclic performance with a lower overpotential even at a high current density of 3 mA cm(-2).