高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (4): 576.

• 论文 • 上一篇    下一篇

尖晶石LiMn2O4前驱体的低热固相反应法合成机理及其结构与热分解过程研究

唐新村1,2, 何莉萍1, 陈宗璋1, 贾殿赠3, 夏熙3   

  1. 1. 湖南大学化学化工学院, 长沙 410082;
    2. 中南大学化学化工学院功能材料所, 长沙 410083;
    3. 新疆大学应用化学研究所, 乌鲁木齐 830046
  • 收稿日期:2002-06-03 出版日期:2003-04-24 发布日期:2003-04-24
  • 通讯作者: 陈宗璋(1945年出生),男,教授,博士生导师,从事无机非金属材料研究.

Structure, Preparation Mechanism and Thermo decomposition Process of LiMn2O4 Precursor Prepared by Low heating Solid state Reaction

TANG Xin Cun1,2, HE Li Ping1, CHEN Zong Zhang1, JIA Dian Zeng3, XIA Xi3   

  1. 1. College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;
    2. Institute of Functional Material Chemistry, College of Chemistry and Chemical Engineering, Center South University, Changsha 410083, China;
    3. Institute of Applied Chemistry, Xinjiang University, Wulumuqi 820046, China
  • Received:2002-06-03 Online:2003-04-24 Published:2003-04-24

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摘要： 以氢氧化锂、醋酸锰和柠檬酸为原料,采用低热固相反应法制备了Li+与Mn2+摩尔比为1∶2的前驱体化合物LiMn2L(Ac)2.通过元素分析、红外光谱、质谱和热重/差热等测试方法对前驱体的组成、结构、合成反应机理及热分解过程进行了研究.结果表明,可在全固相条件下通过低热固相反应得到锂离子与锰离子达到分子级混合水平的前驱体,该前驱体在350℃下焙烧4h即可出现明显的尖晶石相LiMn2O4产物.

关键词: 低热固相反应, 前驱体, 尖晶石LiMn2O4

Abstract: The precursors were prepared from lithium hydroxide, manganese acetate and citric acid by the method of low heating solid state reaction with the molar ratio of Li+ to Mn 2+ as 1∶2. The composition, structure, reaction mechanism and thermo decomposing process of the precursor were studied by using elemental analysis, IR spectrum, MS spectrum and TG/DTA analysis. The results show that the composition of precursor was fitted as LiMn2L(Ac)2, in which L represents citric acid radical and Ac was acetic acid radical. Spinel LiMn2O4began to form only at 350 ℃ for 4 h.

Key words: Low heating solid state reaction, Precursor, Spinel LiMn2O4

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