成核
阳极
材料科学
电镀(地质)
法拉第效率
剥离(纤维)
图层(电子)
阴极
涂层
化学工程
金属
合金
电化学
沉积(地质)
电流密度
箔法
复合材料
冶金
化学
电极
物理化学
工程类
古生物学
有机化学
地质学
物理
生物
量子力学
地球物理学
沉积物
作者
Chuanliang Wei,Huifang Fei,Yongling An,Tao Yuan,Jinkui Feng,Yitai Qian
出处
期刊:Journal of materials chemistry. A, Materials for energy and sustainability
[The Royal Society of Chemistry]
日期:2019-01-01
卷期号:7 (32): 18861-18870
被引量:93
摘要
Lithium metal has long been recognized as the ultimate anode due to its low density, ultrahigh theoretical specific capacity, and lowest electrochemical potential. However, a number of issues, such as the uncontrollable growth of Li dendrites and unstable SEI during repeated Li plating/stripping processes, impede its practical application. Herein, uniform Li deposition on metallic current collectors was achieved via regulating the initial nucleation barrier by coating a thin 3 °C GaInSnZn liquid-metal layer on the surface. In the plating process of Li on liquid-metal-coated current collectors, a lithiation process initially occurred by the formation of a Li-rich alloy layer. As this Li-rich alloy layer was lithiophilic, the nucleation barrier was reduced, and Li was readily nucleated and uniformly grown on the alloy sites in the further plating process. As a result, liquid-metal-modified Cu foil exhibited improved coulombic efficiency and a smaller voltage fluctuation in the plating/stripping process. Better electrochemical performance was also demonstrated in full cells with LiFePO4 as the cathode. This work proposes a new and facile strategy for inducing the uniform deposition of Li, paving the way for the practical application of Li–metal anodes in high-energy-density Li–metal batteries.
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