超声空化联合机械活化制备尖晶石LiMn2O4及其电化学性能  

Synthesis and Electrochemical Performance of Spinel LiMnO Based on Ultrasonic Cavitation and Mechanical Activation Method

作　　者：夏书标 黄文进 张雁南[2] 李普良 李伟 周忠仁[2] 张英杰[2] XIA Shu-biao;HUANG Wen-jin;ZHANG Yan-nan;LI Pu-liang;LI Wei;ZHOU Zhong-ren;ZHANG Ying-jie

机构地区：[1]曲靖师范学院化学与环境科学学院,云南曲靖655011 [2]昆明理工大学冶金与能源工程学院,云南昆明650093 [3]中信大锰矿业有限责任公司,广西南宁530028

出　　处：《有色设备》2020年第3期12-15,共4页Nonferrous Metallurgical Equipment

基　　金：大学生创新创业训练计划项目(2077360143);云南省科技厅高校联合重点项目(2018FH001-007)。

摘　　要：采用超声空化联合机械活化法合成一系列微观形貌不同的锂离子电池正极材料LiMn2O4,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、电池充放电测试仪对制备的LiMn2O4正极材料的相组成特性、微观形貌和电化学性能进行相关测试。结果表明,本方法制备的LiMn2O4正极材料具有良好的尖晶石结构,延长机械活化时间可以得到致密的类球形结构的尖晶石材料,其中经过机械活化4 h后烧结得到的样品具有良好的电化学性能,在6 C放电倍率下放电比容量为88.2 mAh·g^-1,返回0.5 C时容量恢复效率达到91.3%。A series of spinel LiMn2O4 electrodes were synthesized through the ultrasonic cavitation combined with the mechanical activation method. The crystal structure, morphology, and the electrochemical performance of the as-prepared samples were investigate by X-ray diffraction(XRD), scanning electron microscopy(SEM) and the LAND test system, respectively. All the samples exhibited favorable spinel structure, and the spherical mophology can be obtained by extending the mechanical activation time. Notably, the sample sintered after mechanical activation for 4 h delivered excellent rate capability and reversibility, exhibiting 88.2 mAh·g-1 at 5 C, and the recovering efficiency was up to 91.3% when the discharge rate was returned to 0.5 C.

关 键 词：锂离子电池 尖晶石锰酸锂 机械活化 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]