基于铜基底的TiO_2纳米管阵列储锂性能(英文)  

Lithium Storage Performances of TiO_2 Nanotube Arrays on Copper Substrate

作　　者：陈公德[1] 张卫新[1] 杨则恒[1] 王强[1] 姚宏旭[1] 

机构地区：[1]合肥工业大学化工学院,可控化学与材料化工安徽省重点实验室,合肥230009

出　　处：《无机化学学报》2013年第8期1759-1768,共10页Chinese Journal of Inorganic Chemistry

基　　金：supported by the National Natural Science Foundation of China(NSFC Grants21271058,21176054,and 20871038);the Education Department of Anhui Provincial Government(TD200702)~~

摘　　要：研究了基于铜基底的TiO2纳米管阵列直接作为锂离子电池电极的储锂性能。以铜基底上生长的Cu(OH)2纳米棒阵列为模板,采用自牺牲模板法,通过外向包覆与内向刻蚀,制备了非晶态的TiO2纳米管阵列,然后将其在500℃下退火处理4 h,获得锐钛矿型TiO2纳米管阵列。采用X射线衍射、场发射扫描电镜、透射电镜、热重分析对样品进行表征;采用恒电流充放电、循环伏安和交流阻抗谱测试对退火前后TiO2纳米管阵列的电化学性能进行研究。结果表明:与非晶态的TiO2纳米管阵列相比,锐钛矿型TiO2纳米管阵列吸附水的含量低,结晶度高,电荷迁移阻力小,锂离子扩散系数大,结构稳定,具有更好的循环性能和倍率性能;在0.2C下,其首次放电比容量为353 mAh·g-1,经过40次循环后的放电比容量仍为243 mAh·g-1,在8C下的放电比容量为90 mAh·g-1。Lithium storage performances of TiO2 nanotube arrays on copper substrate as electrodes in lithium-ion batteries were investigated. Amorphous TiO2 nanotube arrays were prepared via a sacrificial template method from outward coating of TiO2 and inward etching of Cu（OH）2 nanorod array templates on copper substrate. Anatase TiO2 nanotube arrays were obtained by post-heating the sample at 500℃ for 4 h. The samples were characterized by X-ray diffraction （XRD）, field-emission scanning electron microscopy （FESEM）, transmission electron microscopy （TEM）, and thermogravimetric analysis （TGA）. The electrochemical performances of amorphous and anatase TiO2 nanotube arrays were investigated by galvanostatic charge-discharge measurements, cyclic voltammetry （CV）, and electrochemical impedance spectroscopy （EIS）. The results indicate that compared with amorphous TiO2 nanotube arrays, anatase TiO2 nanotube arrays exhibit a superior rate capability and cycling performance due to their lower amounts of adsorbed water, higher crystallization, lower charge-transfer resistance, higher lithium-ion diffusion coefficient, and more stable one-dimensional tubular structure. They show an initial specific discharge capacity of 353 mAh.g-1 and 243 mAh.g-1 even after 40 cycles at 0.2C. At a high rate of 8C, their discharge capacity can reach 90 mAh.g-1.

关 键 词：TIO2 纳米管阵列 模板 负极 锂离子电池 

分 类 号：O614.33[理学—无机化学] TM912.9[理学—化学]