锂离子电池Li_4Ti_(4.95)Zr_(0.05)O_(12)负极材料的结构与电化学性能  

Structure and Electrochemical Performance of Li_4Ti_(4.95)Zr_(0.05)O_(12) Anode Materials for Lithium-ion Battery

作　　者：鲍自力 朱彦荣[2] 郝国栋[3] 周安娜[2] 

机构地区：[1]中铁时代建筑设计院有限公司,安徽芜湖241001 [2]安徽工业大学化学与化工学院,安徽马鞍山243002 [3]牡丹江师范学院化学与化工学院,黑龙江牡丹江157012

出　　处：《有色金属工程》2015年第6期7-10,共4页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(51404002);牡丹江市科技攻关项目(G2012g0008);黑龙江省教育厅科技项目(11521575)

摘　　要：采用高温固相法合成Li_4Ti_5O_(12)及Li_4Ti_(4.95)Zr_(0.05)O_(12)材料,采用扫描电镜(SEM)、X射线粉末衍射(XRD)、充放电测试和循环伏安(CV)研究材料的结构和电化学性能。结果表明,两种材料均具有较小的平均粒径和窄的粒度分布,Zr4+进入晶格结构内部,具有纯相的尖晶石结构。0.1C倍率时,Li_4Ti_(4.95)Zr_(0.05)O_(12)首次放电比容量高达248 m A·h/g,略低于Li_4Ti_5O_(12)。1.0C倍率放电比容量为145 m A·h/g,5.0C倍率140次循环后,放电比容量仍达到121 m A·h/g,明显高于纯相Li_4Ti_5O_(12)材料,具有较好倍率性能。Li4Ti5O（12） and Li4Ti4.95Zr0.05O12 materials are prepared by a solid-state reaction method,and the structure and electrochemical properties are investigated by scanning electron microscopy（ SEM）,X-ray powder diffraction（ XRD）,charge-discharge tests and cyclic voltammetry（ CV）,respectively. The results indicate that both materials show small particle size and narrow particle size distribution. Zr ions enters into the lattice structure,and forms a pure phase spinel structure. The initial discharge capacity of Li4Ti（4. 95）Zr（0. 05）O（12） reaches 248 m A·h / g at 0.1C rate,it is less than that of pure Li4Ti5O（12）. Its discharge capacity is 145 m A·h / g at 1. 0C rate. After 140 cycles,the discharge capacity of Li4Ti4.95Zr0.05O12 also reaches 121 m A·h / g,it is obviously greater than that of pure Li4Ti5O（12）,and exhibits good rate performance.

关 键 词：锂离子电池 负极材料 Li4Ti4.95Zr0.05O12 倍率性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]