菱方结构锂离子正极材料Li_xMnO_2的合成及其电化学性能  

Synthesis and electrochemcal properties of rhombohedral structure Li_xMnO_2 for anode Materials of lithium-ion battery

作　　者：贾娜尔.努尔苏力坦 张艳慧[1] 粟智[1] 

机构地区：[1]新疆师范大学化学化工学院,乌鲁木齐830054

出　　处：《化工新型材料》2013年第6期98-99,180,共3页New Chemical Materials

基　　金：新疆高校科研计划重点资助项目(XJEDU2009I28)

摘　　要：以Mn(OH)2作为反应前驱体,LiOH·H2O为锂化剂,K2MnO4为氧化剂,采用氧化原位反应方法,在缓和的实验条件下合成出层状菱方结构Li0.65MnO2材料。采用X射线粉末衍射(XRD)、电感耦合等离子体原子发射光谱(ICP)、透射电子显微镜(TEM)等手段对样品进行了表征。结果表明,使用该方法可以获得单一相、晶型较好、纯度较高的样品。合成的材料表现出了很好的电化学性能,其初始放电比容量168.9mAh/g,在室温下经过50次循环之后电池放电比容量仍稳定在132.1mAh/g。Li0.6s MnO2 compounds with rhombohedral structure were prepared by the oxidation-reduction reaction method using Mn（OH）2 as the precursor, KMnO4 as the oxidant, and LiOH ~ H20 as the lithium reagent at the room tem- perature. The powder X-ray diffraction（XRD）,inductively coupled plasma （ICP）and scanning electron microscopy（SEM） were applied to investigate the structures of the sample. The results indicated that the Li0. 65 MnOe exhibited a good rate ca pability,a satisfactory capacity and acceptable cycle-life characteristics. The specific capacity was more than 168mAh/g for the first discharge,and remained at 132. lmAh/g at room temperature.

关 键 词：锂离子 正极材料 菱方结构LiMnO2 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]