微波法合成LiNi_(0.5)Mn_(1.5)O_4尖晶石  

LiNi_(0.5)Mn_(1.5)O_4 Spinel Synthesized Through Microwave Method

作　　者：赵玉燕 田润赛 常彩云 姜鑫宇 张通红 冯季军[1] ZHAO Yuyan;TIAN Runsai;CHANG Caiyun;JIANG Xinyu;ZHANG Tonghong;FENG Jijun(School of Chemistry and Chemical Engineering,University of Jinan,Jinan 250022,China)

机构地区：[1]济南大学化学化工学院,山东济南250022

出　　处：《济南大学学报（自然科学版）》2018年第4期320-324,共5页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(51102114;21201079)

摘　　要：分别利用溶胶-凝胶、有机共沉淀、水热过程3种方法制备前驱体,通过辅助微波加热制备了高电压正极材料镍锰酸锂(LiNi_(0.5)Mn_(1.5)O_4)尖晶石;利用X射线衍射光谱(XRD)、傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、电化学交流阻抗谱(EIS)和充放电测试,对所制备材料的结构、形貌和电化学性能进行了表征与测试。结果表明:不同制备方法所得前驱体经微波加热处理后均得到了立方结构的LiNi_(0.5)Mn_(1.5)O_4尖晶石,晶体结构处于Ni/Mn分布有序与无序之间;溶胶-凝胶辅助微波法制备的LiNi_(0.5)Mn_(1.5)O_4尖晶石结晶度较高,形貌规整,具有较好电化学性能,当放电流为0.2 C时,首次放电比容量为123.3 m A·h/g;在1 C下循环50圈后,容量保持率为94.5%。The cathode material LiNi（0.5）Mn（1.5）O4 spinel was prepared respectively through sol-gel,organic coprecipitation,hydrothermal assisted microwave methods. XRD,FTIR,SEM,EIS and charge-discharge test were used to characterize and measure the structural,morphological and electrochemical properties of the materials. The results show that the materials synthesized through different precursors take on highly crystalline spinel structure between order and disorder. The LiNi（0.5）Mn（1.5）O4 spinel synthesized by sol-gel assisted microwave method has high crystallinity and good electrochemical properties. Discharged at 0. 2 C,the initial specific discharge capacity is 123. 3 m A·h/g. The capacity retention after 50 cycles can be up to 94. 5% when cycling at 1 C rate.

关 键 词：LiNi0.5Mn1.5O4尖晶石 微波法 溶胶-凝胶 有机共沉淀 水热 

分 类 号：O646.21[理学—物理化学]