材料科学
枝晶(数学)
合金
阳极
电镀(地质)
聚合物
锂(药物)
电解质
金属锂
化学工程
纳米技术
电极
复合材料
物理化学
内分泌学
化学
几何学
工程类
地质学
医学
数学
地球物理学
作者
Rui Wang,Jin Yu,Juntao Tang,Ruijin Meng,Linda F. Nazar,Lezhi Huang,Xiao Liang
标识
DOI:10.1016/j.ensm.2020.07.039
摘要
Dendrite growth and unstable surface properties are main challenges for the practical use of lithium metal anode. The promise of Li-rich alloy protection layers on lithium stems from their lower predilection for dendrite growth, however, information from a thermodynamic point of view that invoke the specific properties of the alloy is scarce. Besides, the alloy layers require further engineering to satisfy the volume change of Li during plating/stripping. Herein, we correlated the non-dendritic behavior and the alloy surface properties by low surface barriers, by considering the dynamic event of the electrodeposition when Li atoms encountering the alloy surface. A flexible protective layer containing the Li-rich alloy and polymer was designed on lithium metal, in which the alloy component is responsible for regulating the non-dendrite electrodeposition while the polymer is beneficial for the flexibility. The protected lithium anode remained dendrite‐free for over 3400 h (1700 cycles) at 1 mA cm−2 in Li||Li symmetric cells and exhibited outstanding stability towards the electrolyte.
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