材料科学
纳米管
法拉第效率
枝晶(数学)
阳极
曲率
锂(药物)
金属锂
纳米技术
扩散
碳纳米管
金属
化学工程
电极
冶金
物理化学
化学
内分泌学
工程类
物理
热力学
医学
数学
几何学
作者
Karnpiwat Tantratian,Daxian Cao,Ahmed Abdelaziz,Xiao Sun,Jinzhi Sheng,Avi Natan,Lei Chen,Hongli Zhu
标识
DOI:10.1002/aenm.201902819
摘要
Abstract The application of lithium (Li) metal anodes in rechargeable batteries is primarily restricted by Li dendrite growth on the metal's surface, which leads to shortened cycle life and safety concerns. Herein, well‐spaced nanotubes with ultrauniform surface curvature are introduced as a Li metal anode structure. The ultrauniform nanotubular surface generates uniform local electric fields that evenly attract Li‐ions to the surface, thereby inducing even current density distribution. Moreover, the well‐defined nanotube spacing offers Li diffusion pathways to the electroactive areas as well as the confined spaces to host deposited Li. These structural attributes create a unique electrodeposition manner; i.e., Li metal homogenously deposits on the nanotubular wall, causing each Li nanotube to grow in circumference without obvious sign of dendritic formation. Thus, the full‐cell battery with the spaced Li nanotubes exhibits a high specific capacity of 132 mA h g −1 at 1 C and an excellent coulombic efficiency of ≈99.85% over 400 cycles.
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