材料科学
成核
阳极
碳纳米管
电解质
枝晶(数学)
化学工程
电极
多孔性
电流密度
金属锂
复合数
纳米技术
极化(电化学)
电镀(地质)
复合材料
化学
几何学
数学
物理
有机化学
物理化学
量子力学
工程类
地球物理学
地质学
作者
Fanfan Liu,Rui Xu,Zexun Hu,Shufen Ye,Shuai Zeng,Yu Yao,Siqi Li,Yan Yu
出处
期刊:Small
[Wiley]
日期:2018-12-27
卷期号:15 (5)
被引量:106
标识
DOI:10.1002/smll.201803734
摘要
Abstract Li metal is demonstrated as one of the most promising anode materials for high energy density batteries. However, uncontrollable Li dendrite growth and repeated growth of solid electrolyte interface during the charge/discharge process lead to safety issues and capacity decay, preventing its practical application. To address these issues, an effective strategy is to realize uniform Li nucleation. Here, a stable lithium–scaffold composite electrode (CC/CNT@Li) is designed by melting of lithium metal into 3D interconnected lithiophilic carbon nanotube (CNT) on a porous carbon cloth (CC). The 3D interconnected CNTs successfully change the lithiophobic CC into lithiophilic nature, reducing the polarization of the electrode, ensuring homogenous Li nucleation and continuous smooth Li plating. The CNTs on the surface of CC provide adequate Li nucleation sites and reduce the areal current density to avoid Li dendrite growth. The 3D porous structure of CC/CNT offers enough free room for buffering the huge volume change during Li plating/stripping. The CC/CNT@Li composite anode exhibits dendrite‐free morphology and superior cycling performances over 500 h with low voltage hysteresis of 18, 23, and 71 mV at the current density of 1, 2, and 5 mA cm −2 , respectively.
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