阳极
法拉第效率
剥离(纤维)
钠
材料科学
阴极
电化学
金属
碳纤维
化学工程
电镀(地质)
无机化学
电极
化学
冶金
复合材料
复合数
工程类
物理化学
地质学
地球物理学
作者
Bingyan Wang,Tongtong Jiang,Lijuan Hou,Hui Wang,Tingting Xu,Zhuangfei Zhang,Dezhi Kong,Xinjian Li,Ye Wang
标识
DOI:10.1016/j.ssi.2021.115711
摘要
Sodium metal is one of the most promising anodes for sodium ion batteries (SIBs) owing to its high theoretical capacity, low redox potential, abundant content and low price. However, due to the high reactivity and infinite volume change of sodium metal, unstable SEI film and dendrite are formed during the repeated plating and stripping process, leading to low Coulombic efficiency (CE) and inferior cycle stability, even serious safety issue. Herein, linear shaped sodiophilic N-doped hollow carbon tubes (NCTs) were designed and constructed as stable sodium metal hosts. The plating and stripping behavior of sodium metal in NCT is investigated by in-situ transmission electron microscopy (TEM). The results show that sodium metal is preferentially nucleated and deposited in the tube, and then could be completely stripped off from the tube. Moreover, [email protected] anode can be stably cycled for more than 800 h with a high CE of 98.53% at a current density of 1 mA cm−2 and a capacity of 1 mAh cm−2. The analysis result indicates that the improved electrochemical performance can be attributed to the special designed nitrogen functional groups tuned sodiophilic surface with enhanced fast surface kinetics and the hollow carbon tube structure. Finally, a full cell with [email protected] and [email protected] as the cathode and anode, respectively, was assembled and delivered a capacity of 81.46 mAh g−1 after 100 cycles at 100 mA g−1. Our results demonstrate that NCT is a promising candidate as a sodium metal host for future generation of sodium metal batteries.
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