无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2016, Vol. 48 ›› Issue (1): 68-.

• 论文 • 上一篇    下一篇

纳米核壳二氧化钛的可控制备及储锂性能研究

程 贺, 郭 冰   

  1. 合肥工业大学化学与化工学院,安徽合肥 230009
  • 出版日期:2016-01-10 发布日期:2016-01-20

Controllable synthesis of TiO2 core-shell nanostructure and lithium storage performance thereof

 CHENG   He,   Guo- Bing   

  1. School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,China
  • Online:2016-01-10 Published:2016-01-20

摘要: 以氟钛酸铵为钛源,采用尿素和双氧水控制Ti4+水解速率,经过一步水热,制备出了锐钛矿型的二氧化钛核壳纳米结构,500 ℃煅烧处理得到电极材料。采用X射线衍射(XRD)、场发射扫描电镜(FESEM)、恒流充放电及循环伏安测试对材料的结构、形貌和电化学性能进行表征。结果表明产物形貌尺寸均一,分散性较好。与市售二氧化钛纳米颗粒相比,二氧化钛核壳纳米结构具有多孔结构及优异的结构稳定性,从而具有更好的循环性能和倍率性能。在0.1C倍率下,二氧化钛核壳纳米结构放电比容量为344 mA·h/g,当放电倍率提高到10C时,仍然具有72 mA·h/g的放电比容量。在1C的放电倍率下,经过100次循环,二氧化钛核壳纳米结构放电容量保持率为80%。

关键词: 锂离子电池, TiO2, 电化学性能

Abstract: TiO2 core-shell nanostructures have been hydrothermally prepared through controlling hydrolysis rate of Ti4+ ions by urea and H2O2 in(NH42TiF6 aqueous solution.Electrode materials were obtained by post-heating at 500 ℃.The structure, morphology,and electrochemical performance prepared materials were characterized by XRD,FESEM,and galvanostatic charge-discharge measurements and cyclic voltammetry.Result indicated that the products had well-defined morphologies, uniform sizes,and good dispersion.In comparison with commercial TiO2 nanoparticles,core-shell structures had unique porous structures and excellent structural stability,thus exhibiting a superior cycle performance and rate capability.TiO2 core-shell nanostructures can deliver a discharge capacity of 344 mA·h/g and 72 mA·h/g at 0.1C and 10C rates,respectively. Moreover,TiO2 core-shell nanostructures delivered a high retained capacity about 80% at 1C after 100 cycles.

Key words: lithium ion batteries, TiO2, electrochemical performance

中图分类号: