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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

锂离子电池正极材料Li3V2(PO4)3的制备及性能研究

应皆荣, 高剑, 姜长印, 李维, 唐昌平   

  1. 清华大学核能与新能源技术研究院, 北京 102201
  • 收稿日期:2005-10-19 修回日期:2005-12-12 出版日期:2006-09-20 网络出版日期:2006-09-20

Preparation and Characterization of Li3V2(PO4)3 Cathode Material for Lithium Ion Batteries

YING Jie-Rong, GAO Jian, JIANG Chang-Yin, LI Wei, TANG Chang-Ping   

  1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 102201, China
  • Received:2005-10-19 Revised:2005-12-12 Published:2006-09-20 Online:2006-09-20

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摘要： 单斜结构的Li3V2(PO4)3是很有前途的聚阴离子型锂离子电池正极材料. 将一定配比的LiOH H2O、V2O5、H3PO4和蔗糖(C12H22O11)通过球磨均匀混合, 在氮气保护下于800℃焙烧16h, 通过碳热还原合成了Li3V2(PO4)3. 用X射线衍射和扫描电镜分析对材料的结构和形貌进行了表征. 充放电测试表明, 在电压范围为3.0~4.3V和3.0~4.8V时, Li3V2(PO4)3正极材料具有较高的比容量、优良的循环性能和倍率特性. 在电压范围为1.5~4.8V时, Li3V2(PO4)3正极材料具有很高的比容量, 但循环性能较差.

关键词: 锂离子电池, 正极材料, Li3V2(PO4)3

Abstract: Monoclinic lithium vanadium phosphate Li3V2(PO4)3 is a very promising polyanion-type cathode material for lithium ion batteries. In this work, LiOH·H2O, V2O5, H3PO4 and sucros(C12H22O11) were homogeneously mixed with certain molar ratios by ball-milling, and then sintered at 800℃ for 16h in N2. The Li3V2(PO4)3 powders were finally synthesized via carbothermal reduction process. The structure and morphology of Li3V2(PO4)3 powders were characterized by XRD and SEM. At charge-discharge cut-off voltages of 3.0-4.3V and 3.0-4.8V, the material shows rather high specific capacity, excellent cycling performance and rate capability. At charge-discharge cut-off voltages of 1.5-4.8V, the material shows very high specific capacity but poor cycling performance.

Key words: lithium ion batteries, cathode material, Li3V2(PO4)3