CuP2 as high-capacity and long-cycle-life anode for potassium-ion batteries

• 作者: Lin Li Zhe Hu Yong Lu Shuo Zhao Qiu Zhang Qiannan Liu Zhenhua Yan Shu-Lei Chou
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（12）
• 页码范围: 246-252
• 页数: 7页
• 语种: 英文

摘要

Metal phosphides have shown great potential for potassium-ion batteries because of their high theoret-ical specific capacity.Nevertheless,most of the metal phosphide anodes are plagued by rapid capacity decay (caused by the large volume changes during the discharge/charge process),which would restrict their further practical application.Herein,a chemically bonded CuP2/C composite was prepared by a facile high-energy ball milling method.A potassium bis(trifluoromethanesulfonyl)imide (KFSl)-based electrolyte was adopted instead of a conventional KPF6-based electrolyte for the CuP2/C composite anode.Benefiting from the synergistic effects of the formation of strong P-O-C chemical bonds and the KFSI-based electrolyte,the CuP2/C composite anode exhibited high reversible capacity (451.4 mAh g-1 at 50 mA g-1),excellent rate performance (123.5 mAh g-1 at 1000 mA g-1),and superior cycling stability(300 mAh g-1 after 100 cycles).This work paves the way for the development of high-performance CuP2 anode for potassium-ion batteries.