Enhancing electrochemical performance of fluorinated graphite by polydopamine−derived nitrogen−doped carbon coating
Enhancing electrochemical performance of fluorinated graphite by polydopamine−derived nitrogen−doped carbon coating
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DOI：
10.1016/j.electacta.2022.140718
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发表时间：
2022-06
影响因子：
6.6
通讯作者：
Caifeng Zhu;Xiangyan Shen;Zi-Jie Gao;Yanyan Li;Xiaozhong Wu;Jinping Zhao;Pengfei Zhou;Shuping Zhuo;Jin Zhou
中科院分区：
文献类型：
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作者：
Caifeng Zhu;Xiangyan Shen;Zi-Jie Gao;Yanyan Li;Xiaozhong Wu;Jinping Zhao;Pengfei Zhou;Shuping Zhuo;Jin Zhou
氟化石墨（CFx）的电子导电性差是限制其电化学性能的关键问题之一。本文中，聚多巴胺衍生的氮掺杂碳涂层适于通过改变其电子电导率来改善CFx的电化学性能。研究了盐酸多巴胺/碳氟化合物的比例和碳化温度对氮掺杂碳包覆碳氟化合物（CFx@NC−x−y）阴极电化学性能的影响。与原始CFx相比，CFx@NC−x−y阴极具有增强的倍率性能和放电平台，以及增加的能量和功率密度。特别是，CFx@NC−3−350实现了优化的电化学性能，例如在2000 mA g− 1下放电容量为550.5 mAh g− 1，平台为2.18 V，对应于4360 W kg− 1和1171.2 Wh kg−1的高功率和能量密度，而原始CFx无法工作。增强的电化学性能有助于氮掺杂碳包覆CFx的电子电导率的提高。
The poor electronic conductivity of fluorinated graphite (CFx) is one of the key problems limiting its electrochemical performance. Herein, polydopamine−derived nitrogen−doped carbon coating is adapted to improve the electrochemical performance of CFxby modifying its electronic conductivity. The effects of dopamine hydrochloride/CFxratio and the carbonization temperature on the electrochemical performance of nitrogen−doped carbon coated CFxsamples (CFx@NC−x−y) cathodes are investigated. CFx@NC−x−y cathodes present enhanced rate performance and discharge plateau, and increased energy and power densities, compared with the pristine CFx. Particularly, the CFx@NC−3−350 achieves optimized electrochemical performance, such as a discharge capacity of 550.5 mAh g−1with a plateau of 2.18 V at 2000 mA g−1, corresponding to high power and energy densities of 4360 W kg−1and 1171.2 Wh kg−1, whereas the pristine CFxis unable to work. The enhanced electrochemical performance is contributed to the improved electronic conductivity of the nitrogen−doped carbon−coated CFx.