Lithium Storage Performance of Hollow and Core/Shell TiO_2 Microspheres Containing Carbon

作     者：Songgyun Ri 邓洪贵 周丽辉 胡军 刘洪来 胡英 

作者机构：State Key Laboratory of Chemical Engineering Department of Chemistry East China University of Science and Technology 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2014年第22卷第10期

页      面：1153-1161页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081704[工学-应用化学] 07[理学] 0817[工学-化学工程与技术] 08[工学] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：Supported by the National Natural Science Foundation of China(21176066) the 111 Project of the Ministry of Education of China(B08021) the Fundamental Research Funds for the Central Universities 

主　　题：Lithium ion battery Titanium dioxide microsphere Hollow Core/shell Electrochemical properties 

摘      要：TiO2 microspheres containing carbon have been synthesized viaa one-pot hydrothermal process using CTAB as the mesoporous template and nanoparticle stabilizer and Ti(SO4)2and sucrose as titanium and carbon precursors,respectively. Through well designed calcinations, Ti O2 microspheres with various amounts of carbon-residue,such as core/shell C@TiO2, hollow neat H–TiO2, and hollow C/TiO2 composites, are obtained. When these microspheres are used as anode materials for lithium ion batteries, the lithium storage performance is significantly influenced by the structure and carbon-residue. With a thin shell of TiO2 nanoparticles and carbon-residue, the capacity of hollow C/TiO2 composites maintains at 143.3 m A·h·g-1at 0.5 C(83.5 m A·g-1) after 100 ***, after high rate charge/discharge cycles from 0.2 C to 20 C and back to 0.2 C again, the reversible capacity recovers atas high as 195.1 m A·h·g-1with respect to its initial value of 205.0 m A·h·g-1. The results of cycle voltammograms and electrochemical impedance spectroscopy further reveal that Li+insertion/extraction processes are reversible, and the diffusion coefficient of Li+in the hollow C/TiO2 composites is much higher than those of others, because the hollow structure can act as the ion-buffering reservoir and facilitate Li+transfer from both sides of the shell, and the carbon-residue in the shell improves the conductivity as well.