摘要
采用液相共沉淀法制备镍锰复合碳酸盐前驱体,650℃煅烧后生成的镍锰复合氧化物与Li2CO3混合,在空气中于750～900℃下煅烧10h,600℃退火10h得到LiNi0.5Mn1.5O4。采用XRD、SEM和恒电流充放电测试等对样品进行了表征。SEM结果表明,合成温度对LiNi0.5Mn1.5O4的表面形貌及粒径有较大影响;XRD结果表明,合成的样品均为纯的立方尖晶石结构。电化学测试结果表明,800℃合成的样品在室温下具有较好的电化学性能:0.1、1、2、4C首次放电容量分别130.24、129.47、115.5、108.05mAh/g,且大倍率下具有较好的循环性能。
LiNi0.5Mn1.5O4 spinel has been prepared by a composite carbonate process, and the effects of calcination temperature on the physical properties and electroche-mical performance of the samples have been investigated. The results of XRD and scanning electron microscopy （SEM） showed that as calcination temperature increa-ses , the grain sizes of the samples is obviously increase. It was found that the samples calcined at 800℃ present good electrochemical performance. Between 3.5-4. 9V versus Li, it delivered 130.24,129.47,115.5, 108.05mAh/g at 0. 1,1, 2,4C rates respectively. And it showed good cycle performance under high current density.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2009年第6期933-935,939,共4页
Journal of Functional Materials
基金
国家重点基础研究发展计划(973计划)资助项目(2007CB613607)
