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

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• 作者：Qun Guan ; Jianli Cheng ; Xiaodong Li ; Wei Ni and Bin Wang
• 刊名：Chinese Journal of Chemistry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：35
• 期：1
• 页码：48-54
• 全文大小：2964K
• ISSN：1614-7065

文摘

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 °C 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 mA•h•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.