高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (2): 175.

• 研究论文 • 上一篇    下一篇

Al掺杂对Li(AlyCo1-y)O2材料结构的影响

郝万君, 陈岗, 史延慧   

  1. 吉林大学材料科学系, 长春 130023
  • 收稿日期:2000-02-29 出版日期:2001-02-24 发布日期:2001-02-24
  • 通讯作者: 陈岗(1958年出生),男,博士,教授.从事无机功能材料物理研究.
  • 基金资助:

    国家自然科学基金(批准号:19774028)资助

The Influence of Al Doping on the Structure of Li(AlyCo1-y)O2 Materials

HAO Wan Jun, CHEN Gang, SHI Yan Hui   

  1. Department of Materials Science, Jilin University, Changchun 130023, China
  • Received:2000-02-29 Online:2001-02-24 Published:2001-02-24

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摘要： 报道了在800℃烧结制备的新型锂二次电池正极材料Li(AlyCo1-y)O2(y=0,0.11)的X射线衍射结果和由此而揭示的结构演化过程.研究表明,y≤0.5时,材料呈单相,0.6≤y≤0.9时,材料呈两相[Li(AlyCo1-y)O2,C-LiAlO2]共存状态,y=1时,材料又呈单相,为LiAlO2相.Li(AlyCo1-y)O2材料中y值的上限即Al的最大固溶度在0.5左右.在单相区(y≤0.5),随着Al掺杂的增多,Li(AlyCo1-y)O2材料晶格结构参数发生变化,a轴缩短,c轴变长,c/a比基本呈线性增加,材料的层状属性更加明显.

关键词: 锂电池正极材料, XRD, 结构, Li(AlyCo1-y)O2

Abstract: X-ray diffraction for Li(Aly Co1-y )O2 was carried out for different values of y(y =0, 0.1—1). The structural evolution of the material with y was revealed. It is shown that material is in single layered phase for y ≤0.5; in double phases [Li(Aly Co1-y )O2 and γ-LiAlO2] for 0.6≤ y ≤0.9 and single [ γ-LiAlO2] phase for y =1. The highest solubility for the Al doping is about 50%. Lattice constant a decreases, and lattice constant c increases, respectively, within the region of Al doping for y ≤0.5.

Key words: Cathode materials for lithium batteries, XRD, Structure, Li(Aly Co1-y )O2

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