层状LiMnO_2的软化学法合成及电化学性能的研究  

Soft Chemistry Synthesis and Electrochemical Properties of Layered LiMnO_2

作　　者：雷太鸣[1] 汤昊[1] 张克立[1] 

机构地区：[1]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2004年第2期165-168,共4页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金资助项目(20071026)

摘　　要：采用软化学法合成了单斜结构的层状LiMnO2材料.首先用流变相法合成层状单斜结构的前驱体NaMnO2,然后由溶剂热法在120℃得到具有层状单斜结构的产物LiMnO2.用X 射线衍射图谱表征了前驱体及反应产物的结构,用扫描电子显微镜测定了反应产物的形貌,并对反应产物的电化学性能进行了初步研究.结果表明,层状LiMnO2材料表现出良好的电化学充放电循环性能.在室温和25mA/g的充放电速率下,LiMnO2/Li电池的首次放电比容量为131mA·h·g-1,第30次放电比容量为128mA·h·g-1.Layered LiMnO_2 was synthesized by soft chemistry synthesis method. First, layered (NaMnO_2) with a monoclinic structure was synthesized by rheological phase reaction method, then the precursor was used to prepare layered LiMnO_2 at 120℃ by solvothermal method . The structure of the product and the precursor was characterized by X-ray diffraction (XRD). The morphology of the product was showed with scan electron microscope (SEM).The electrochemical properties of the product were studied by electrochemical measurements.The data of electrochemical measurements show the electrode of layered (LiMnO_2) has good electrochemical properties with a first discharge capacity of 131 mA·h·g^(-1) and retaining 128 mA·h·g^(-1) in the 30th cycle at a current rate of 25 mA/g at room temperature.

关 键 词：锂离子电池 层状LIMNO2 流变相反应 溶剂热法 软化学 

分 类 号：TM911.14[电气工程—电力电子与电力传动] O646.5[理学—物理化学]