Characterization and Electrochemical Properties of Nanostructured Zr-Doped Anatase TiO2 Tubes Synthesized by Sol-Gel Template Route

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2017,（6）
• 页码范围: 527-534
• 页数: 8页
• 语种: 英文

摘要

A series of nanostructured Zr-doped anatase TiO2 tubes with the Zr/Ti molar ratio of 0.01,0.02,0.03,and 0.09 were prepared by a sol-gel technology on a carbon fiber template.The electrochemical performance of Zr-doped anatase TiO2 as anodes for rechargeable lithium batteries was investigated and compared with undoped titania.Tests represented that after 35-fold charge/discharge cycling at C/10 the reversible capacity of Zr-doped titania (Zr/Ti=0.03) reaches 135 mAhg-1,while the capacity of undoped titania (Zr/Ti =0) yielded only 50 mA h g 1.Based on the results of the physicochemical investigation,three reasons of improving electrochemical performance of Zr-doped titania were suggested.According to the scanning electron microscopy and transmission electron microscopy,Zr4+ doping induces a decrease in nanoparticle size,which facilitates the Li+ diffusion.The Raman investigations show the more open structure of Zr-doped TiO2 as compared to undoped titania due to changing of the unit cell parameters,that significantly affects on the reversibility of the insertion/extraction process.The electrochemical impedance spectroscopy results indicate that substitution of Zr4+ for Ti4+ into anatase TiO2 has favorable effects on the conductivity.