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电化学(中英文) ›› 2006, Vol. 12 ›› Issue (3): 262-265. 

• 研究论文 • 上一篇    下一篇

分散剂PVA对水热反应制备LiFePO_4性能的影响

李会林;詹晖;周运鸿;   

  1. 武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院 湖北武汉430072,湖北武汉430072,湖北武汉430072
  • 收稿日期:2006-08-28 修回日期:2006-08-28 出版日期:2006-08-28 发布日期:2006-08-28

The Influence of PVA as Disperser on LiFePO_(4) Synthesized by Hydrothermal Reaction

LI Hui-lin,ZHAN Hui~   

  1. (*),ZHOU Yu-hong (College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072,Hubei,China
  • Received:2006-08-28 Revised:2006-08-28 Published:2006-08-28 Online:2006-08-28

摘要: 应用改进的水热反应法制得粒径小且分布均匀的L iFePO4颗粒,煅烧时加葡萄糖形成包覆碳.XRD、SEM和充放电测试表明,该材料粒径约200 nm,颗粒的尺寸分布比较均匀,具有3.45 V的放电平台,放电容量最高达到140 mAh/g,循环到第40周容量仅衰减2.1%.详细讨论了如何有效调控L iFePO4的粒子尺寸以及包覆碳对其电化学性能的影响.

关键词: 锂离子电池, 正极材料, LiFePO4, 粒径, 包覆碳, 电化学性能

Abstract: LiFePO_(4) was synthesized by means of hydrothermal reaction,in which PVA acts as disperser and glucose as carbon source.The samples were characterized by X-ray diffraction,scanning electron microscopy and electrochemical measurement.SEM results show that the sample is homogeneously composed of grains with a particle size of ca.200nm.In the charge/discharge test,the products exhibited a 3.45V discharge voltage plateau and a maximum specific capacity of 140mAh/g.After 40 cycles,its capacity only declined by 2.1%.Besides these,the mechanism for the influence of the particle size and carbon coating on the electrochemical property of LiFePO_(4)material was discussed in detail.

Key words: Lithium ion batteries, Cathode material, LiFePO_(4), Particle size, Carbon coating, Electrochemical performance

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