Surface-engineering enhanced sodium storage performance of Na3V2(PO4)3 cathode via in-situ self-decorated conducting polymer route

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2017,（12）
• 页码范围: 1546-1553
• 页数: 8页
• 语种: 英文
• DOI: 10.1007/s11426-017-9125-y

摘要

The key to the development of sodium ion battery is materials with a high rate capacity and cycle stability.Conducting coating is an efficient approach to improve electrochemical performance.As a case study,the Na3V2(PO4)3@PEDOT composite was prepared through an in-situ self-decorated conducting polymer route without further calcination.The Na3V2(PO4)3 electrode with a 7％ poly(3,4-ethylenedioxythiophene) (PEDOT) coating can deliver an initial reversible capacity of 100 mA h g-1 at 1 cycle,and 82％ capacity retention over 200 cycles.The results also show that the Na3V2(PO4)3 electrode without and with a thick PEDOT coating exhibits poor electrochemical performance,indicating that an appropriate coating layer is important for improving electronic conductivity and regulating Na-ion insertion.Therefore,this work offers possibility to promote the electrochemical performance of poor-conducting materials in sodium-ion batteries using an in-situ self-decorated conducting polymer.