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Effects of Carbon on Structure and Electrochemical Performance of Li2FeSiO4 Cathode Materials for Lithium-ion Batteries
ZUO Pengjian *,CHENG Guangyu,WANG Tao,LI Chunxiao,YIN Geping
School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
*Correspondence author
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Funding: Natural Science Foundation of China (No.no. 50902038), Natural Scientific Research Innovation Foundation in Harbin Institute of Technology)
Opened online:11 January 2012
Accepted by: none
Citation: ZUO Pengjian,CHENG Guangyu,WANG Tao.Effects of Carbon on Structure and Electrochemical Performance of Li2FeSiO4 Cathode Materials for Lithium-ion Batteries[OL]. [11 January 2012] http://en.paper.edu.cn/en_releasepaper/content/4459279
 
 
Li2FeSiO4/C composite cathode material was prepared by solid-state method with sucrose as carbon source. The effects of carbon content on structure and electrochemical performance of Li2FeSiO4/C cathode materials for lithium-ion batteries were investigated. The materials were characterized comparatively by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), galvanostatic charge-discharge, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV), respectively. The SEM images showed that the Li2FeSiO4/C consists of partially agglomerated nanoparticles with an average particle size of 100 nm. TEM images confirmed that a carbon layer was formed on the surface of Li2FeSiO4/C particles, which aimed to enhance the electronic conductivity of the material as well as inhibit the agglomeration during annealing process. The electrochemical measurement results revealed that the Li2FeSiO4/C composite with 7.5wt % carbon shows a good electrochemical performance with an initial discharge capacity of 141 mAhog-1 at 0.1C, and remains a discharge capacity of 103.6 mAhog-1 at 0.5C after 50 cycles.
Keywords:lithium ion battery; cathode material; Li2FeSiO4/C; solid-state method; electrochemical performance
 
 
 

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