高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (8): 1484.

• 研究论文 • 上一篇    下一篇

LiNi1-xAlxO2(x=0~0.6)的制备和结构演变

刘伟1, 宫杰2,3, 杨景海2, 宗占国3, 陈岗1   

  1. 1. 吉林大学材料科学与工程学院, 长春130023;
    2. 吉林师范大学凝聚态物理研究所, 四平136000;
    3. 长春大学应用物理研究所, 长春130022
  • 收稿日期:2005-01-07 出版日期:2005-08-10 发布日期:2005-08-10
  • 通讯作者: 陈 岗(1958年出生),男,博士,教授,博士生导师,从事材料物理与化学研究.E-mail:gchen@jlu.edu.cn E-mail:gchen@jlu.edu.cn
  • 基金资助:

    国家“九七三”计划项目(批准号:2002AA304044);教育部科学技术研究重大项目(批准号:10411);吉林省科学技术规划项目(批准号:20030123)资助.

Synthesis and Structure Evolution of LiNi1-xAlxO2(x=0—0.6)

LIU Wei1, GONG Jie2,3, YANG Jing-Hai2, ZONG Zhan-Guo3, CHEN Gang1   

  1. 1. College of Materials Science and Engineering, Jilin University, Changchun 130023, China;
    2. Institute of Condensed State Physics, Jilin Normal University, Siping 136000, China;
    3. Applied Physics Institute, Changchun University, Changchun 130022, China
  • Received:2005-01-07 Online:2005-08-10 Published:2005-08-10

摘要: 通过研究LiNiO2和α-LiAlO2的制备条件,合成出LiNi1-xAlxO2(x=0~0.6)材料.XRD和XPS测试结果表明,各样品均具有α-NaFeO2型单相结构,并形成LiNi1-xAlxO2固溶体.随着Al固溶量x的增加,材料Ni(Al)—O结合能增加,晶胞的a轴缩短,c/a比增大,层状属性更加明显,结构稳定性增强.烧结实验结果表明,在低Al固溶量时,材料的合成需要在氧气气氛中进行,Al掺杂能够抑制结构中的Li缺位,降低材料形成温度及其在合成过程中对氧气的依赖程度.

关键词: LiNi1-xAlxO2, &alpha, -NaFeO2型结构, 固溶体, 结合能

Abstract: LiNi1-xAlxO2 is one of new cathode materials for lithium batteries, which was a solid solution of LiNiO-2 and α-LiAlO2. However, it is difficult to synthesize the solid solution with a high aluminum solid solubility because it is easy to decompose due to its negative synthesis enthalpy. A new synthesis method was obtained by studying the preparation conditions of LiNiO-2 and α-LiAlO2, then LiNi1-xAlxO2(x=0—0.6) was synthesized successfully. The samples of LiNi1-xAlxO2(x=0—0.6)were studied by XRD and XPS, the results show that all samples have a single α-NaFeO2 structure and LiNi1-xAlxO2 solid solutions were synthesized. With the increasing of aluminum solid solubility x, not only Ni(Al)O binding energy increased, but also lattice constant decreased and the ratio of c/a increased. As a result, the bedded structure was more obvious and the stability was enhanced.

Key words: LiNi-{1-x}Al-xO-2, α-NaFeO2 structure, Solid solution, Binding energy

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