材料科学
法拉第效率
分散性
阳极
枝晶(数学)
锂(药物)
阴极
电极
碳纤维
化学工程
电流密度
纳米技术
电镀(地质)
剥离(纤维)
复合材料
电气工程
化学
高分子化学
物理
物理化学
内分泌学
工程类
地质学
几何学
复合数
医学
量子力学
数学
地球物理学
作者
Yuping Liu,Yanzhong Zhen,Taoran Li,Frederik Bettels,Yong Chen,Manhua Peng,Yucang Liang,Fei Ding,Lin Zhang
出处
期刊:Small
[Wiley]
日期:2020-10-08
卷期号:16 (44): 2004770-2004770
被引量:19
标识
DOI:10.1002/smll.202004770
摘要
To unlock the great potential of lithium metal anodes for high-performance batteries, a number of critical challenges must be addressed. The uncontrolled dendrite growth and volume changes during cycling (especially, at high rates) will lead to short lifespan, low Coulombic efficiency (CE), and security risks of the batteries. Here it is reported that Li metal anodes, employing the monodisperse, lithiophilic, robust, and large-cavity N-doped hollow carbon nanospheres (NHCNSs) as the host, show remarkable performances—high areal capacity (10 mAh cm−2), high CE (up to 99.25% over 500 cycles), complete suppression of dendrite growth, dense packing of Li anode, and an extremely smooth electrode surface during repeated Li plating/stripping. In symmetric cells, a highly stable voltage hysteresis over a long cycling life >1200 h is achieved, and a low and stable voltage hysteresis can be realized even at an ultrahigh current density of 64 mA cm−2. Furthermore, the NHCNSs-based anodes, when paired with a LiFePO4 (LFP) cathode in full cells, give rise to highly improved rate capability (104 mAh g−1 at 10 C) and cycling stability (91.4% capacity retention for 200 cycles), enabling a promising candidate for the next-generation high energy/power density batteries.
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