摘要
采用溶胶-凝胶法制备出了4.55 V高电位材料LiNi0.5Mn1.5O4.利用扫描电子显微镜(SEM)观察样品的微观形貌及粒径,用X射线衍射仪对产物进行晶体结构分析,高精度电测试仪对半电池进行充放电和循环性能测试.结果表明,高电位LiNi0.5Mn1.5O4正极材料为尖晶石结构,粒度范围100 nm^2.5μm,颗粒的轮廓较为清晰,晶体结构为立方晶系,Fd3m空间群.电特性测试表明:半电池电压范围3.45 V^4.6 V之间,出现了2个充放电平台.在0.1C倍率下循环12次后其充放电效率保持率在81%左右.
The 4.55V high potential material LiNi0.5Mn1.5O4 was synthesized via sol-gel method. The surface morphology and particle size of the sample were observed by scanning electron microscope （SEM）. The crystal structure of the sample was collected and analyzed through X-ray diffractometry （XRD）. The performance of charge-discharge and cyclic action were characterized by high precision electrical tester. The results indicated that the high potential material LiNi0.5Mn15O4 was spinel structure, the particle size was about 100nm-2.5μm, there was obvious dispersion between particles and particles, crystal structure was the cubic crystal system and space group of Fd3m. Electrical characteristics tests shown that between 3.45 V and 4.6 V, there were two charge - discharge platforms. The cycling retention rate was about 81%, after being charge-discharged at a rate of 0. 1C for 12 times.
出处
《广西科技大学学报》
CAS
2014年第1期37-39,49,共4页
Journal of Guangxi University of Science and Technology
基金
广西重点实验室建设项目(13-051-38)
广西重点实验室开发基金项目(2012KFMS04
2013KFMS01)
广西车辆动力与新能源研发中心建设项目资助
