Li_(4-x)Cu_(x)Ti_(5)O_(12)电池材料的制备及电化学性能研究  

Li_(4-x)Cu_(x)Ti_(5)O_(12) battery material and its electrochemical performance

作　　者：庄晓东 李荣兴[2] 和晓才 徐庆鑫 谢刚 Zhuang Xiaodong;Li Rongxing;He Xiaocai;Xu Qingxin;Xie Gang(Kunming Metallurgy Research Institute Co.,Ltd.,Kunming 650500;Metallurgy and Energy Engineering College,Kunming University of Science and Technology,Kunming 650093;State Key Laboratory of Common Associated Non-Ferrous Metal Resources Pressure Hydrometallurgy Technology,Kunming 650503)

机构地区：[1]昆明冶金研究院有限公司,昆明650500 [2]昆明理工大学冶金与能源工程学院,昆明650093 [3]共伴生有色金属资源加压湿法冶金技术国家重点实验室,昆明650503

出　　处：《化工新型材料》2021年第8期145-149,共5页New Chemical Materials

基　　金：云南省科技创新强省计划(2016AA008)。

摘　　要：为改善Ti4Ti5O12的电化学性能,对Li_(4-x)Ti_(5)O_(12)进行Cu2+的Li位掺杂改性处理,制备出了Li_(4-x)Cu_(x)Ti_(5)O_(12)复合材料,对材料进行了X射线衍射(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)表征;将材料制成电极并组装成扣式电池,采用蓝电电池测试系统和电化学工作站对材料的电化学性能进行测试。结果表明:对Li_(4-x)Ti_(5)O_(12)进行Cu^(2+)的Li位掺杂可影响Li_(4-x)Ti_(5)O_(12)的晶型结构,降低颗粒大小,可明显提高Li_(4-x)Ti_(5)O_(12)的电化学性能。Li_(3.8)Cu_(0.2)Ti_(5)O_(12)在0.2C倍率下的首次放电比容量为173.30mA/g,100次充放电的循环持率为96.64%,表现出了优异的充放电循环性能。In order to improve the electrochemical performance of Li_(4-x)Ti_(5)O_(12),Li_(4-x)Ti_(5)O_(12) was modified by Cu2+doping in Li position,and Li_(4-x)Cu_(x)Ti_(5)O_(12)composite was prepared.The materials were characterized by XRD,SEM and EDS.The material was made into electrode and assembled into button cell.The electrochemical performance of the material was tested by blue cell test system and electrochemical workstation.The results shown that doping Li_(4-x)Ti_(5)O_(12)with Cu^(2+) in Li position can affect the crystal structure of Li_(4-x)Ti_(5)O_(12),reduced the particle size,and improved the electrochemical performance of Li_(4-x)Ti_(5)O_(12).The first discharge specific capacity of Li_(3.8)Cu_(0.2)Ti_(5)O_(12) at 0.2C was 173.30mA/g,and the cycle holding rate of 100times charge discharge was 96.64%,which shown excellent charge discharge cycle performance.

关 键 词：钛酸铜锂 首次充放电 倍率循环 电化学 锂离子扩散系数 

分 类 号：TM912.9[电气工程—电力电子与电力传动]