Synergistic coupling of amorphous carbon and graphitic domains toward high-rate and long-life K^(+) storage

作     者：Hehe Zhang Wangqin Li Jianhai Pan Zhefei Sun Bensheng Xiao Weibin Ye Chengzhi Ke Haowen Gao Yong Cheng Qiaobao Zhang Ming-Sheng Wang Hehe Zhang;Wangqin Li;Jianhai Pan;Zhefei Sun;Bensheng Xiao;Weibin Ye;Chengzhi Ke;Haowen Gao;Yong Cheng;Qiaobao Zhang;Ming-Sheng Wang

作者机构：State Key Laboratory of Physical Chemistry of Solid SurfacesCollege of MaterialsXiamen UniversityXiamen 361005FujianChina Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials(Xiamen University)Xiamen 361005FujianChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第10期

页      面：533-541,I0013页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 

基　　金：financially supported by the National Natural Science Foundation of China(52172240) the Fundamental Research Funds for the Central Universities(20720200075) the National Program for Thousand Young Talents of China,and the“Double-First Class”Foundation of Materials and Intelligent Manufacturing Discipline of Xiamen University 

主　　题：Potassium-ion batteries Amorphous carbon Graphitic domains Synergistic effect In situ TEM 

摘      要：Amorphous carbon materials hold great potential for practical use in potassium-ion batteries(PIBs)due to their abundant resources,low cost and high structural ***,given the challenge of sluggish potassiation kinetics,the rate performance of amorphous carbon is severely ***,amorphous carbon compounded with graphitic domains(HG-CNTs)was proposed as an advanced anode for *** directly verified by in situ transmission electron microscopy(TEM),the graphitic domains guarantee fast K-ions transport in the carbon composite at a high current density,while the amorphous carbon shells ensure the structural integrity during potassiation,thus boosting its fast and durable K^(+)*** a PlB anode,the HG-CNTs electrode exhibits not only a super-stable long-term cyclability(191.6 mAh g^(-1)at 1 A g^(-1)with almost no capacity decay over 3000 cycles),but also an outstanding rate performance(184.5 mAh g^(-1)at 2 A g^(-1)).Ex situ Raman and TEM results further suggest that the highly reversible structure of HG-CNTs is responsible for its superior electrochemical *** work provides helpful insights into the development of carbonaceous electrodes with both high rate capability and long cycle life for PIBs.