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Synthesis of lifepo_4/c composite cathode Materials Using High Surface Area carbon as carbon Sources

复旦学报（自然科学版） 2007年第5期46卷 824-页

作者： George Ting-kuo Fey Kai-Lun chiang Department of chemical and Materials Engineering National Central University

1 Results The pyrolyzed product of peanut shells was utilized as a carbon source to synthesize a lifepo4/c *** advantages of using agricultural wastes such as peanut shells are low costs,easy processing,and environmentally *** shell was first treated with a porogenic agent to produce a precursor with high porosity and surface area (>2 000 m2·g-1).A small amount of precursor was mixed with lifepo4 fine powders and *** optimum calcination process for synthesizing lifepo4/c co...

关键词： lifepo4/c composite high surface-area carbon cathode

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Synthesis and electrochemical performances of spherical lifepo_4 cathode materials for Li-ion batteries

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Rare Metals 2006年第Z1期25卷 19-24页

作者： ZHOU Jianxin SHEN Xiangqian JING Maoxiang ZHAN Yun School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China

Spherical lifepo4 and lifepo4/c composite powders for lithium ion batteries were synthesized by a novel processing route of co-precipitation and subsequent calcinations in a nitrogen and hydrogen atmosphere. The precursors of lifepo4, lifepo4/c composite and the resultant products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and the electrochemical performances were investigated by galvanostatic charge and discharge tests. The precursors composed of amorphous Fe3(PO4)2·xH2O and crystalline Li3PO4 obtained in the co-precipitation processing have a sphere-like morphology. The spherical lifepo4 derived from the calcinations of the precursor at 700 ℃ for 10 h in a reduction atmosphere shows a discharge capacity of 119 mAh·g-1 at the c/10 rate, while the lifepo4/c composite with 10wt.% carbon addition exhibits a discharge capacity of 140 mAh·g-1. The electrochemical performances indicate that the lifepo4/c composite has a higher specific capacity and a more stable cycling performance than the bare olivine lifepo4 due to the carbon addition enhancing the electronic conductivity.

关键词： spherical lifepo4 lifepo4/c composite co-precipitation cathode material Li-ion battery

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