文献类型：期刊文献

中文题名：空心和核/壳含碳TiO₂微球的锂电存储性能（英文）

英文题名：Lithium Storage Performance of Hollow and Core/Shell TiO₂ Microspheres Containing Carbon ^☆

作者：Songgyun Ri[1];邓洪贵[1];周丽辉[1];胡军[1];刘洪来[1];胡英[1]

机构：[1]State Key Laboratory of Chemical Engineering, Department of Chemistry, East China University of Science and Technology

年份：2014

卷号：0

期号：10

起止页码：1153

中文期刊名：中国化学工程学报：英文版

外文期刊名：Chinese Journal of Chemical Engineering

收录：CSTPCD;;Scopus;CSCD:【CSCD2013_2014】；

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

语种：中文

中文关键词：Lithium;ion;battery;Titanium;dioxide;microsphere;Hollow;Core/shell;Electrochemical;properties

外文关键词：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 cycles.Moreover, 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.
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 cycles.Moreover, 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.