以竹纤维为模板制备微米管状Li_4Ti_5O_(12)负极材料  

Synthesis of microtubes Li_4Ti_5O_(12) anode material by bamboo fiber template

作　　者：邵丹[1] 何嘉荣[1] 刘惠平[1] 卢子华[1] 董先明[1] 禹筱元[1,2] 

机构地区：[1]华南农业大学理学院生物材料研究所,广东广州510642 [2]中国科学院可再生能源与天然气水合物重点实验室,广东广州510640

出　　处：《中南大学学报（自然科学版）》2012年第5期1634-1637,共4页Journal of Central South University:Science and Technology

基　　金：广东省自然科学基金资助项目(9151064201000039);广东省科技计划项目(2009B010900025);华南农业大学"211工程"三期重点建设项目(2009B010100001);华南农业大学新学科扶持基金资助项目(K09140);中国科学院可再生能源与天然气水合物重点实验室开放基金资助项目(Y007K2)

摘　　要：以竹纤维为模板,Ti（OC4H9）4和Li（Ac）.2H2O为原料,用模板法制备锂离子电池微米管状Li4Ti5O12负极材料。采用XRD,SEM,BET,充放电实验和交流阻抗等对合成材料的结构、形貌和电化学性能进行表征。研究结果表明：制备的微米管状Li4Ti5O12负极材料由尖晶石型纳米Li4Ti5O12颗粒构成,具有较大的比表面积,该材料具有良好的电化学性能,在0.5-3.0 V,0.1C倍率下的首次放电比容量为178 mA.h/g,充放电循环100次后放电比容量仍保留162 mA.h/g,且倍率性能优异。Microtube Li4Ti5O12 anode materials for lithium-ion batteries were synthesized using bamboo fiber as template,and Ti（OC4H9）4 and Li（Ac）-2H2O as raw materials.The structure,morphology and electrochemical properties of Li4Ti5O12 were characterized by X-ray diffraction（XRD）,scanning electronic morphology（SEM）,Brunauer-Emmett-Teller method（BET）,galvanostatic charge-discharge tests and electrochemical impedance spectroscopy（EIS） measurements.The results show that the Li4Ti5O12 microtubes are composed of spinel Li4Ti5O12 nano-particles,which has a high special surface area resulting in improved electrochemistry performances.The electrochemical test results show that the spinel Li4Ti5O12 microtube delivers the initial discharge capacity of 178 mA·h/g at 0.1 C current rate in the voltage rang of 0.5-3.0 V,and its discharge capacity retains 162 mA·h/g after 100 cycles.The spinel Li4Ti5O12 material has an excellent rate performance.

关 键 词：锂离子电池 负极材料 模板法 微米管状Li4Ti5O12 竹纤维 

分 类 号：TM912.9[电气工程—电力电子与电力传动]