高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (11): 2021.

• 研究论文 • 上一篇    下一篇

空气条件下高温固相合成层状LiMnO2及其离子交换的影响规律

路艳罗, 卫敏, 杨文胜, Evans D.G., 段雪   

  1. 北京化工大学可控化学反应科学与技术基础教育部重点实验室, 北京100029
  • 收稿日期:2002-02-06 出版日期:2002-11-24 发布日期:2002-11-24
  • 通讯作者: 段 雪(1957年出生),男,教授,博士生导师,从事无机功能材料研究.E-mail:hewilly@sina.com.cn E-mail:hewilly@sina.com.cn
  • 基金资助:

    北京市科技新星计划(批准号:H013610350112);北京化工大学青年教师科研基金(批准号:QN0136)资助

Synthesis of LiMnO2 by Solid State Reaction in Air and the Influence of Ion Exchange Conditions on Its Structure

LU Yan-Luo, WEI Min, YANG Wen-Sheng, Evans D.G., DUAN Xue   

  1. Key Laboratory of Science and Technology of Controllable Chemical Reactions, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2002-02-06 Online:2002-11-24 Published:2002-11-24

摘要: 在空气中高温固相反应合成了层状单斜结构前驱体NaMnO2,在不同条件下进行离子交换反应,得到LiMnO2.用X射线衍射法表征了前驱体及交换产物的晶体结构,用电感耦合等离子体光谱进行元素含量分析,用扫描电镜测定晶体的形貌.结果表明,离子交换反应条件对反应速率和产物的晶体结构与组成有重要影响.

关键词: 层状材料, 离子交换, LiMnO2

Abstract: Layered sodium manganese bronze NaMnO2 with a monoclinic structure has been synthesized in air. Its structure is similar to the bronze synthesized in argon. The precursor was used to prepare layered LiMnO2 by ion exchange of Na+ by Li+ under different ion exchange conditions: in a LiCl/LiNO3 eutectic at 300 ℃, in n-hexanol at 145 ℃, in water at 105 ℃, and in ethanol at 95 ℃. X-ray diffraction indicates that the precursor and ion exchange products have a layered structure with the monoclinic space group C2/m. Both XRD and ICP analysis demonstrate that temperature influences the rate of the ion exchange reaction and the crystal structure of LiMnO2 in each case. The higher the temperature, the faster the reaction, and the more severe the distortion of the products. SEM micrographs show that LiMnO2 possesses a needle-like morphology.

Key words: Layered material, Ion exchange, LiMnO2

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