尖晶石型LiMn_(2-x)In_xO_4(x=0,0.01,0.02,0.05)的合成及电化学性能研究  

Synthesis and Electrochemical Performances of Spinel LiMn_(2-x)In_xO_4(x=0,0.01,0.02,0.05)

作　　者：王超[1] 刘兴泉[1] 刘宏基[1] 向小春[1] 张峥[1] 

机构地区：[1]电子科技大学微电子与固体电子学院,电子薄膜与集成器件国家重点实验室,新能源材料与集成能源器件研发中心,成都610054

出　　处：《无机化学学报》2012年第9期1835-1842,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21071026);电子科技大学杰出人才引进项目(No.08JC00303)资助项目

摘　　要：以醋酸锰、氢氧化锂和三氧化二铟为原料,以柠檬酸为配位剂,采用溶胶-凝胶法制备了掺杂In的尖晶石LiMn2-xInxO4(x=0,0.01,0.02,0.05),采用XRD、SEM对目标材料进行了结构和形貌表征,采用恒流充放电、循环伏安(CV)以及交流阻抗(EIS)谱测试对材料进行了电化学性能表征,考察了不同In掺杂量对材料性能的影响。结果表明,当In掺杂量为1%时,LiMn1.99In0.01O4样品具有纯的尖晶石锰酸锂结构,在0.5C和3.4～4.35 V电压范围条件下,LiMn1.99In0.01O4的初始放电容量为119.9 mAh.g-1,经过1C 30次,2C 30次,再0.5C 5次循环后,其放电容量保持率为84.9%,显示了良好的电化学性能。掺杂1%的In的样品比未掺杂的样品具有更优的高温循环稳定性能。The spinel LiMn2-xInxO4（x=0,0.01,0.02,0.05） cathode materials were prepared by a citric acid-assisted sol-gel method using LiOH,Mn（CH3COO）2 and In2O3 as raw materials and citric acid as the chelating agent.The resultant materials were characterized by XRD and SEM for the structure and morphology,respectively.The electrochemical properties of the materials were investigated by galvanostatic charge and discharge,CV and EIS test.The influence of different indium dopant concentration on the electrochemical properties of LiMn2-xInxO4 cathode materials was examined.The results revealed that the LiMn1.99In0.01O4 sample exhibits the pure cubic spinel phase structure without impurity.And the initial discharge capacity of LiMn1.99In0.01O4 was 119.9 mAh.g-1 at 0.5C and 3.4～4.35 V range,it remained 84.9% of the initial specific discharge capacity after 0.5C by 30 cycles,1C by 30 cycles,2C by 30 cycles,and 0.5C by 5 cycles again.The LiMn1.99In0.01O4 displayed better electrochemical performance.Compared with the parent LiMn2O4,the cyclic performance of LiMn1.99In0.01O4 cathode material at elevated temperature was more excellent than the undoped LiMn2O4.

关 键 词：尖晶石锰酸锂 铟离子掺杂 锂离子电池 正极材料 LiMn2-xInxO4 

分 类 号：TM912.9[电气工程—电力电子与电力传动] O614.111[理学—无机化学]