明胶辅助高温固相法合成LiNi05Mn15O4高电压正极材料  

Preparation of LiNi_(0.5)Mn_(1.5)O_4 for High Voltage Cathode Materials by A Gelatin-Assisted Solid-State Method

作　　者：莫名月[1] 郭均盛 叶成聪 陈红雨[1] 

机构地区：[1]华南师范大学化学与环境学院,电化学储能材料与技术教育部工程研究中心,广州510006

出　　处：《华南师范大学学报（自然科学版）》2015年第4期69-73,共5页Journal of South China Normal University(Natural Science Edition)

基　　金：广东省战略性新兴产业发展专项资金项目(301-5);2013年(国家级)大学生创新创业训练计划项目(1057413004)

摘　　要：以醋酸盐为原料,分别在4个不同煅烧温度条件下,采用明胶辅助-高温固相法制备获得尖晶石型Li Ni0.5Mn1.5O4正极材料,通过XRD、SEM、FT-IR和充放电循环考察了这4种产物的组成结构、颗粒形貌和电化学性能.结果表明:随着煅烧温度升高,材料的结晶度相应提高,初始放电比容量逐渐增大,样品的最大初始放电比容量为137 m Ah/g.经600℃退火处理的材料的粒径尺寸增大,空间群结构转变为Fd3m相和P4332相同时并存,循环稳定性和小倍率放电能力也随之得到改善,而900℃煅烧的材料则在高倍率下表现出较优的容量保持率.Spinel powders of LiNi0.5Mn1.5O4 were synthesized by a gelatin-assisted solid-state method at four different calcination temperatures. The structural and morphological properties, electrochemical characteristics of the four obtained products were investigated by XRD, SEM, FT-IR and charge/discharge testing. As the temperature increases, the crystallinity and initial discharge capacity gradually raise. The maximum specific discharge capacity of the synthesized LiNi0.5Mn1.5O4 is 137 mAh/g. After annealing treated at 600℃ , Fd3m group and P4332 group are found to coexist in the structure with larger particle size. And the cycling stability and rate performance at low rate are improved. However, the product caleinated at 900 ℃ shows a better rate capacity retention at high rate from 1 C to 5C.

关 键 词：明胶辅助 LINI0.5MN1.5O4 退火 

分 类 号：O646[理学—物理化学]