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Synthesis and Characterization of LiFePO4/C Composite Obtained by One-Step Solid-State Reaction Using Solid PVA as Carbon Source

Published online by Cambridge University Press:  31 January 2011

Limei Yang ,
Guangchuan Liang ,
Li Wang ,
Xiaoke Zhi  and
Xiuqin Ou
Limei Yang
Affiliation:
yanglimei0318@163.com, Institute of Power Source and Ecomaterials Science, Tianjin, China
Guangchuan Liang
Affiliation:
liangguangchuan@hebut.edu.cn, Institute of Power Source and Ecomaterials Science, Tianjin, China
Li Wang
Affiliation:
tigerwlzq@yahoo.com.cn, Institute of Power Source and Ecomaterials Science, Tianjin, China
Xiaoke Zhi
Affiliation:
zxkb440@yahoo.cn, Institute of Power Source & Ecomaterials Science, Box1055, Hebei University of Technology, 300130, Tianjin, China, Tian Jin, 300130, China
Xiuqin Ou
Affiliation:
ouxiuqin@hebut.edu.cn, Institute of Power Source and Ecomaterials Science, Tianjin, China
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Abstract

LiFePO4/C composite cathode materials were synthesized by one-step solid-state reaction using FePO4 as main raw materials and solid PVA (Polyvinyl Alcohol) as a reductive agent and carbon source. The sample was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), particle size analysis and charge-discharge test. The results indicated that the carbon generated from the pyrogenation of PVA did not affect the olivine structure of the cathode materials but considerably improved its high-rate discharge ability and cycle performance. The initial discharge capacity of the sample was 149.7, 133.1, 120.6, 93.0 mAh/g at 0.2C, 1C, 2C, 5C respectively, and the discharge capacity could reach 90 mAh/g at 5C rates after 80 cycles. It is believed that the carbon coating could lead to small particle size and high electronic conductivity of active materials, thus leading to excellent electrochemical performance of LiFePO4/C cathode materials.

Keywords

x-ray diffraction (XRD)crystallographic structurecoating
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1170: Symposium R – Materials for Renewable Energy at the Society and Technology Nexus , 2009 , 1170-R05-01
Copyright
Copyright © Materials Research Society 2009

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