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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LiCrxMn2-xO4的合成及性能研究

姚耀春; 戴永年; 杨斌; 崔萌佳; 李伟宏   

  1. 昆明理工大学材料与冶金工程学院, 昆明 650093
  • 收稿日期:2004-09-21 修回日期:2004-10-28 出版日期:2005-09-20 网络出版日期:2005-09-20

Synthesis and Performance of LiCrxMn2-xO4 Cathode Materials for Li-ion Battery

YAO Yao-Chun; DAI Yong-Nian; YANG Bin; CUI Meng-Jia; LI Wei-Hong   

  1. Faculty of Materials and Metallurgy Engineering; Kunming University of Science and Technology; Kunming 650093, China
  • Received:2004-09-21 Revised:2004-10-28 Published:2005-09-20 Online:2005-09-20

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摘要： 采用Pechini法制备了尖晶石LiCrxMn2-xO4正极材料,并用X射线衍射仪、扫描电镜、充放电测试等手段研究了其晶体结构、表观形貌和电化学性能.结果表明,该法制备的尖晶石LiCrxMn2-xO4(0≤x≤0.1)正极材料为单一尖晶石结构,形貌较好,粒径分布均匀;晶胞参数随着Cr含量的增加而减小,但是Cr掺杂量对于产物的相结构和晶体形貌影响不大;Cr含量的增加使得LiCrxMn2-xO4的比容量减小,但却提高了尖晶石结构的稳定性和循环性能.

关键词: 尖晶石LiCrxMn2-xO4, Pechini法, 正极材料, 锂离子电池

Abstract: Spinel LiCrxMn2-xO4 cathode materials for Li-ion batteries were synthesized by Pe-chini process, and their crystalline structure, apparent morphology and electrochemical performance were characterized with XRD, SEM and charge-discharge test. Results show that the samples of LiCrxMn2-xO4 possess pure spinel phase, better morphology and uniform distribution of gain sizes, with the increase of Cr content, the lattice parameters are reduced, but Cr content has a little effect on the phase structure and morphology of LiCrxMn2-xO4 . When Cr content increases, the specific capacity of the products will decrease, the stability of spinel structure and cycle performance will be improved.

Key words: spinel LiCrxMn2-xO4, pechini process, cathode materials, Li-ion battery

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