TiO_2-聚吡咯纳米复合材料的电化学制备及其在锂硫电池中的应用  

Electrochemical Synthesis of TiO_2-polypyrrole Nanocomposites and an Application to Lithium Sulfur Battery

作　　者：赵云[1,2] 朱文[1,2] 张丽丽[1,2] 曹政[1] 崇保和[1] 

机构地区：[1]华中科技大学材料成型与模具技术国家重点实验室,武汉430074 [2]深圳华中科技大学研究院,深圳518000

出　　处：《材料导报》2016年第20期7-11,共5页Materials Reports

基　　金：国家自然科学基金(21173090);深圳市战略性新兴产业发展专项资金(JCYJ20120618100557119)

摘　　要：采用电化学沉积的方法,以阳极氧化法制备的二氧化钛纳米管阵列为基底,制备出高度有序的TiO_2-聚吡咯(PPy)纳米阵列,再通过共热法,将单质硫颗粒负载到基底阵列中,得到S/PPy/TiO_2纳米阵列结构复合材料。扫描电镜(SEM)、透射电镜(TEM)、能谱(EDX)、傅里叶变换红外光谱(FT-IR)和热重分析(TGA)表征结果表明,TiO_2纳米管高度有序平行排列,管径约120nm,聚吡咯均匀沉积在纳米管壁上,复合材料中硫的质量分数约为61.9%。电化学测试结果表明,在0.1C电流密度下,S/PPy/TiO_2纳米复合材料首次循环比容量达1155mAh·g-1,100次循环后比容量为648.4mAh·g-1,库伦效率保持在96.8%。高容量下良好的循环稳定性能显示出S/TiO_2/PPy纳米阵列结构复合材料作为锂硫电池正极材料的优势。To obtain highly ordered TiO_2-PPy composite with nanotube array structure,PPy was electrochemically deposited onto anodized substrate of TiO_2 nanotube arrays.Then sulfur was loaded into the TiO_2-PPY arrays by co-heating sulfur with TiO_2-PPy composite to form S/PPy/TiO_2 nanocomposites.The resultant samples were characterized by scanning electron microscope（SEM）,transmission electron microscope（TEM）,X-ray spectroscopy（EDX）,Fourier transform infrared spectroscopy（FT-IR）and thermo-gravimetric analysis（TGA）.The results showed that TiO_2 nanotubes were arranged in parallel with highly ordered and uniform tube-array structure that has a diameter of^120nm.PPy uniformly covered on the wall of TiO_2 nanotubes in the S/PPy/TiO_2 nanocomposites which have the sulfur mass percentage of 61.9%.Electrochemical test revealed an initial discharge specific capacity of 1155mAh·g-1 at the current density of 0.1C.And the specific capacity still remains in 648.4mAh·g-1 with a high coulombic efficiency of 96.8%after 100 cycles.The high capacity and excellent cycling performance exhibit the advantage of S/TiO_2/PPy composite with nanotube array structure as cathode for lithium sulfur battery.

关 键 词：二氧化钛 聚吡咯 纳米复合材料 电化学 锂硫电池 正极材料 

分 类 号：TM911[电气工程—电力电子与电力传动]