摘要
导电碳包覆是提升锂离子电池Li3V2(PO4)3正极材料电化学活性的重要手段之一.以可溶性淀粉和碳纳米管为复合碳源制备Li3V2(PO4)3/C/CNT复合材料,研究碳纳米管的加入对Li3V2(PO4)3电化学性能的影响.结果表明,与以单一可溶性淀粉为碳源制备的Li3V2(PO4)3/C相比,Li3V2(PO4)3/C/CNT具有更高的大电流充放电容量和循环稳定性,这主要归结于碳纳米管与热解导电碳的协同作用,提高了材料的电子导电性,降低了电极界面电荷转移阻抗,从而提升Li3V2(PO4)3的电化学活性.
Conductive carbon coating was one of the key methods improving the electrochemical performance of Li3V2(PO4)3 cathode materials for lithium-ion batteries.In this paper,Li3V2(PO4)3/C/CNT composite was prepared using soluble starch and carbon nanotubes as double carbon sources.The effect of carbon nanotubes on the electrochemical properties of Li3V2(PO4)3 was investigated.The results showed that Li3V2(PO4)3/C/CNT displayed much higher high-rate charge/discharge capacities and cycling stability,which could be attributed to the synergistic effect of carbon nanotubes and pyrolytic carbon for enhancement of electronic conductivity and reduction of charge transfer impedance,resulting in the improvement of electrochemical activity for Li3V2(PO4)3.
作者
刘晓玉
王飞
汪燕鸣
LIU Xiao-yu;WANG Fei;WANG Yan-ming(School of Chemistry and Materials Science,Huaibei Normal University,Huaibei 235000,Anhui,China;School of Information,Huaibei Normal University,Huaibei 235000,Anhui,China)
出处
《兰州文理学院学报（自然科学版）》
2021年第1期37-42,共6页
Journal of Lanzhou University of Arts and Science(Natural Sciences)
基金
安徽省自然科学基金项目(1908085MB46)
安徽高校自然科学研究项目(KJ2018ZD058)
安徽高校优秀青年人才支持计划项目(gxyqZD2019096)。
