Porous CoF2 Spheres Synthesized by a One-Pot Solvothermal Method as High Capacity Cathode Materials for Lithium-Ion Batteries

作     者：Qun Guan Jianli Cheng Xiaodong Li Bin Wang 

作者机构：Institute of Chemical Materials China Academy of Engineering Physics Mianyang Sichuan 621900 China Sichuan R &D Center of New Materials Mianyang Sichuan 621900 China 

出 版 物：《Chinese Journal of Chemistry》 (中国化学（英文版）)

年 卷 期：2017年第35卷第1期

页      面：48-54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] 0703[理学-化学] 

基　　金：This work was supported by the Applied Fundamental Foundation of Sichuan Province (No. 2014JY0202)  the R&D Foundation of China Academy of Engineering Physics (No. 2014B0302036)  the Science Foundation for Distinguished Young Scholars of Sichuan Province (No. 2016JQ0025) and National Natural Science Foundation of China (Nos. 21401177 and 21501160)  the "1000plan" from the Chinese Government  and the Collaborative Innovation Foundation of Sichuan University (No. XTCS2014009) 

主　　题：CoF2 sphere solvothermal method cathode materials lithium-ion battery 

摘      要：Up to now, there are rare reports of CoF2 spheres used as high capacity cathode materials. Herein, porous CoF2 spheres were synthesized and studied as cathode materials for LIBs. The porous CoF2 spheres were synthesized by a facile one-pot solvothermal method using a safe and inexpensive ammonium fluoride as the fluorine sources. The nature of the synthesis can avoid using corrosive fluorine sources and additional high-temperature thermal treatment The structure, morphologies and electrochemical performance of the samples obtained at different reaction times and solvothermal temperatures were investigated. The results show that the CoF2 spheres obtained at 200 ℃ for 20 h show better electrochemical performances, including a high initial discharge capacity, good capacity retention and high Coulombic efficiency. It can deliver a high initial discharge capacity of 537.8 mAoh·g-1 and keep 127.4 mA·h.g- 1 after 30 cycles used as cathode materials for lithium-ion batteries. The good electrochemical performances may be attributed to good crystallinity, porous structure and relatively intermediate sphere size.