Li3V2(PO4)3/C/rGO复合正极材料的制备及电化学性能  

Preparation and electrochemical performance of Li3V2(PO4)3/C/rGO cathode materials

作　　者：刘晓玉[1] 李娇娇 王飞 汪燕鸣[1] LIU Xiaoyu;LI Jiaojiao;WANG Fei;WANG Yanming(School of Chemistry and Materials Science,Huaibei Normal University,Huaibei 235000,Anhui Province,China;Information College,Huaibei Normal University,Huaibei 235000,Anhui Province,China)

机构地区：[1]淮北师范大学化学与材料科学学院,安徽淮北235000 [2]淮北师范大学信息学院,安徽淮北235000

出　　处：《电子元件与材料》2020年第7期41-46,共6页Electronic Components And Materials

基　　金：安徽省自然科学基金(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(gxyqZD2019096)。

摘　　要：以可溶性淀粉和氧化石墨烯为复合碳源,采用球磨混料和固相反应法制备锂离子电池Li3V2(PO4)3/C/rGO复合正极材料。研究碳源对材料形貌、颗粒尺寸和电化学性能的影响。结果表明,在淀粉和氧化石墨烯复合碳源的协同作用下可获得分散性良好的亚微米尺度团聚体颗粒,其电化学性能显著优于单一淀粉或氧化石墨烯为碳源制备的材料。Li3V2(PO4)3/C/rGO在10C高倍率下的放电比容量达到124 mAh/g,在1C倍率下循环300次的容量保持率达到95%,优异的倍率性能和循环稳定性使其有望应用于动力锂离子电池正极材料。Li3V2(PO4)3/C/rGO composite, as cathode material for lithium ion batteries, was prepared via ball milling and solid-state reaction. Both the soluble starch and graphene oxide were used as the carbon sources. The effect of carbon source on the morphology, particle size and electrochemical performance of the composite was investigated. The results indicate that the synergistic effect of starch and graphene oxide leads to submicron-sized aggregate particles with good dispersity. The electrochemical performance of the composite prepared using both carbon sources are better than that of single carbon source derived composites. LVP/C/rGO exhibits a discharge capacity of 124 mAh/g at 10 C and a capacity retention of 95% after 300 cycles at 1 C. The outstanding rate capability and cycling stability make it a promising cathode material for power lithium ion batteries.

关 键 词：锂离子电池 磷酸钒锂 正极材料 倍率性能 氧化石墨烯 可溶性淀粉 

分 类 号：TQ152[化学工程—电化学工业]