插层(化学)
材料科学
吸附
阳极
化学工程
碳纤维
无机化学
氧气
纳米技术
电极
有机化学
物理化学
复合材料
复合数
化学
工程类
作者
Fei Sun,Hua Wang,Zhibin Qu,Kunfang Wang,Lijie Wang,Jihui Gao,Jianmin Gao,Shaoqin Liu,Yunfeng Lu
标识
DOI:10.1002/aenm.202002981
摘要
Abstract Oxygen‐containing groups in carbon materials have been shown to affect the carbon anode performance of sodium ion batteries; however, precise identification of the correlation between specific oxygen specie and Na + storage behavior still remains challenging as various oxygen groups coexist in the carbon framework. Herein, a postengineering method via a mechanochemistry process is developed to achieve accurate doping of (20.12 at%) carboxyl groups in a carbon framework. The constructed carbon anode delivers all‐round improvements in Na + storage properties in terms of a large reversible capacity (382 mAg −1 at 30 mA g −1 ), an excellent rate capability (153 mAg −1 at 2 A g −1 ) as well as good cycling stability (141 mAg −1 after 2000 cycles at 1.5 A g −1 ). Control experiments, kinetic analysis, density functional theory calculations, and operando measurements collectively demonstrate that carboxyl groups not only act as active sites for Na + capacitive adsorption through suitable electrostatic interactions, but also gradually expand d ‐spacing by inducing a repulsive force between carbon layers with Na + preadsorbed, and hence facilitate diffusion‐controlled Na + insertion process. This work provides a new insight in the rational tunning of oxygen‐containing groups in carbon for boosting reversible Na + storage through a synergy of adsorption and intercalation processes.
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