东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2006, Vol. 27 ›› Issue (10): 1130-1133.DOI: -

• 论著 • 上一篇    下一篇

锂钒氧化物的制备与电化学性能研究

刘丽英;田彦文;翟玉春;徐茶清;   

  1. 东北大学材料与冶金学院;东北大学材料与冶金学院;东北大学材料与冶金学院;东北大学材料与冶金学院 辽宁沈阳110004;辽宁沈阳110004;辽宁沈阳110004;辽宁沈阳110004
  • 收稿日期:2013-06-23 修回日期:2013-06-23 出版日期:2006-10-15 发布日期:2013-06-23
  • 通讯作者: Liu, L.-Y.
  • 作者简介:-
  • 基金资助:
    辽宁省科技厅资助项目(2003224005).

Preparation of lithium vanadium oxide and its electrochemical performance

Liu, Li-Ying (1); Tian, Yan-Wen (1); Zhai, Yu-Chun (1); Xu, Cha-Qing (1)   

  1. (1) School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
  • Received:2013-06-23 Revised:2013-06-23 Online:2006-10-15 Published:2013-06-23
  • Contact: Liu, L.-Y.
  • About author:-
  • Supported by:
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摘要： 以Li_2CO_3和NH_4VO_3为原料,采用非熔融态的固相反应法合成了锂离子电池正极材料锂钒氧化物.通过TG-DTA,XRD分析确定了合成反应的主要历程.XRD测试表明,580℃焙烧10h获得的产物为单一相层状结构,晶型发育良好.循环伏安测试表明,Li~+在材料中嵌入脱出的机理不同,嵌入是分步进行的.恒电流充放电测试表明,锂钒氧化物的初始容量为252.9mAh.g-1,55次循环后容量保持率高达97.07%,循环性能优良.交流阻抗测试表明,材料具有较高的离子电导率,有利于提高其电化学性能.

关键词: 锂离子电池, 正极材料, Li_(1+x)V_3O_8, 反应历程, 电化学性能

Abstract: Lithium vanadium oxide, as cathode material for Li-ion battery, was synthesized by non-molten solid-state reaction with Li2CO3 and NH4VO3 as raw materials. The main reaction mechanism was determined by TG-DTA and XRD tests. XRD results indicate that material calcined at 580°C for 10 h has well-developed layered structure. Cyclic voltammogram tests indicate that insertion and extraction mechanisms of Li+ in Li1+xV3O8 are different, insertion proceeds step by step. Galvanostatic charge-discharge tests show that the initial discharge capacity and capacity retention after 55 cycles are 252.9 mAh·g-1 and 97.07%, respectively. AC analysis shows that the material has higher ion conductivity which is good for better electrochemical performance.

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