材料科学
阳极
金属锂
碳纳米管
电极
脚手架
锂(药物)
纳米管
化学工程
金属
纳米技术
冶金
生物医学工程
化学
物理化学
内分泌学
工程类
医学
作者
Zhaowei Sun,Song Jin,Hongchang Jin,Zhenzhen Du,Yanwu Zhu,Anyuan Cao,Hengxing Ji,Li‐Jun Wan
标识
DOI:10.1002/adma.201800884
摘要
Abstract There has been a renewed interest in using lithium (Li) metal as an anode material for rechargeable batteries owing to its high theoretical capacity of 3860 mA h g −1 . Despite extensive research, modifications to effectively inhibit Li dendrite growth still result in decreased Li loading and Li utilization. As a result, real capacities are often lower than values expected, if the total mass of the electrode is taken into consideration. Herein, a lightweight yet mechanically robust carbon nanotube (CNT) paper is demonstrated as a freestanding framework to accommodate Li metal with a Li mass fraction of 80.7 wt%. The highly conductive network made of sp2‐hybridized carbon effectively inhibits formation of Li dendrites and affords a favorable coulombic efficiency of >97.5%. Moreover, the Li/CNT electrode retains practical areal and gravimetric capacities of 10 mA h cm −2 and 2830 mA h g −1 (vs the mass of electrode), respectively, with 90.9% Li utilization for 1000 cycles at a current density of 10 mA cm −2 . It is demonstrated that the robust and expandable nature is a distinguishing feature of the CNT paper as compared to other 3D scaffolds, and is a key factor that leads to the improved electrochemical performance of the Li/CNT anodes.
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