软化学法合成正交结构LiMnO_2及其电化学性能  

Synthesis and electrochemical properties of orthorhombic structure LiMnO_2

作　　者：米丽班[1] 吐尔逊.巴克 粟智[2] 

机构地区：[1]新疆师范大学科研处,乌鲁木齐830054 [2]新疆师范大学生命科学与化学学院,乌鲁木齐830054

出　　处：《化工新型材料》2010年第4期49-51,共3页New Chemical Materials

基　　金：新疆师范大学博士科研资助基金项目(XJNUBS0807)

摘　　要：研究以氢氧化锂和三氧化二锰为原料，用软化学法制备具有正交结构的锂离子电池正极材料LiMnO2。用X射线衍射法确定了材料的结构，用扫描电镜考察了材料形貌和反应时间的关系，观察结果显示得到的LiMnO2的粒子尺寸在300～500nm。结合循环伏安法和交流阻抗分析研究了合成条件对材料组织结构、尺寸与电化学性能的影响。材料的电化学性能测试结果表明，合成的正交扭曲结构LiMnO2（o-LiMnO2）材料在电化学过程中初期表现了较好的电化学性能。但材料在电化学过程中逐步向尖晶石结构相LiMn2O4转变，容量产生衰减，其循环寿命有待更进一步改善。LiMnO2 samples were prepared as cathode materials for lithium ion batteries by soft-chemical synthesis from LiOH and Mn2O3. X-ray diffraction patterns of prepared samples were identified as the layered LiMnO2 with ortho rhombic structure （o-LiMnO2） . The particle size of the o-LiMnO2 materials was about 300-500 nm by the scanning electron microscopy （SEM） . Cycling vottammetry and electrochemical impedance spectroscopy （EIS） technique were used to studied the correlation between the structure and grain sizes of layered LiMnO2 and its electrochemical properties. The electrochemical performance of the sample as a cathode materials for lithium ion batteries was studied by galvanostatic method. The obtained o-LiMnO2 showed a good cycling behavior. However, its structure transformed into the spinel phase LiMn2O4 and capacity fading during cycling.

关 键 词：锂离子电池 正交结构 层状LIMNO2 软化学合成法 

分 类 号：TM912[电气工程—电力电子与电力传动]