阳极
法拉第效率
成核
材料科学
电流密度
电极
电解质
锂(药物)
复合数
化学工程
导电体
纳米线
集电器
纳米技术
复合材料
化学
工程类
物理
内分泌学
物理化学
有机化学
医学
量子力学
作者
Nanxiang Zhang,Teng Zhao,Lei Wei,Tao Feng,Feng Wu,Renjie Chen
标识
DOI:10.1016/j.jpowsour.2022.231374
摘要
Lithium (Li) metal is an attractive anode for next-generation high-energy-density rechargeable batteries due to its high theoretical capacity and low redox potential. However, the uncontrolled growth of Li dendrites and infinite volume change during Li stripping/plating process lead to low coulombic efficiency and safety concern. To solve these critical issues, copper foam with Cu2O nanowire arrays (COCF) is rationally designed and used as three-dimensional (3D) conductive skeleton for compositing Li. Cu2O nanowire arrays structure with strong capillary forces and lithiophilicity is beneficial for the wetting of molten Li on surface and Li + nucleation. In addition, the 3D robust Cu skeleton with porous structure can reduce the local current density and regulate the distribution of Li+ flux on the electrode surface, leading to homogeneous nucleation and deposition of lithium, as well as mitigating the volume expansion. As a result, the COCF–Li composite lithium anode exhibits a prolonged cycling stability over 1000 h with a low over-potential of ∼50 mV at a current density of 1 mA∙cm−2 in a symmetric cell. Even at a current density of 4 mA∙cm−2 and deposition capacity of 4 mAh∙cm−2, it still delivers a stable cycling performance for 600 h.
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