高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (2): 190.

• 研究快报 • 上一篇    下一篇

反尖晶石LiNiVO4的湿法低温合成

赖琼钰1, 卢集政1, 梁兴龙1, 吉晓洋2   

  1. 1. 四川大学化学学院, 成都 610064;
    2. 四川大学分析测试中心, 成都 610064
  • 收稿日期:1999-08-05 出版日期:2000-02-24 发布日期:2000-02-24
  • 通讯作者: 赖琼钰(1945年出生),女,副教授,从事无机非金属材料研究.
  • 基金资助:

    国家自然科学基金(批准号:29871021)资助

Inverse Spinel LiNiVO4Synthesized by Moist Method at Low Temperature

LAI Qiong-Yu1, LU Ji-Zheng1, LIANG Xing-Long1, JI Xiao-Yang2   

  1. 1. College of Chemistry, Sichuan University, Chengdu 610064, China;
    2. Analysis Measurement Centre, Sichuan University, Chengdu 610064, China
  • Received:1999-08-05 Online:2000-02-24 Published:2000-02-24

关键词: 反尖晶石, LiNiVO4, 湿法合成, 低温

Abstract: In this paper, we report a new kind of moist chemical method for preparing LiNiVO4which can be used to prepare lithium ion battery for the cathode active materials with a very high battery voltage(48 Vvs. Li). Li2CO3, NiCO3and NH4VO3were used as row materials, and H2C2O4saturated solution was used both as a precipitate agent and as a complex agent. The precursor gel composed of (NH4)2(VO)2(C2O4)4·6H2O, NiC2O4·2H2Oand Li 2C2O4can be obtained, and after sintering the dry gel we got the products. The results of XRDshow that the product sintered at 400 ℃ for 2 h exists in a cubic crystal, single phase, inverse LiNiVO4and the average sizes (by Scherrer formula ) were 40-50 nm(400 ℃, 2 h ) and 65-70 nm(700 ℃, 2 h) , respectively, a=0.8223(1) nm. The TGand DTAcurves implied that the dry gel underwent water loss, decompositions of oxalates and complex oxalate, the solid state reactions finished at 377 ℃. The results of XPSproved that the valence in LiNiVO4would be Li+,V5+, Ni2+(in the main), respectively. From ICPanalysis we also knew that the sample corresponded basically to stoichiometry LiNiVO4.

Key words: Inverse spinel, LiNiVO4, Moist chemical synthesis, Low temperature

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