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研究论文

一氧化碳还原法制备磷酸铁锂—反应机理和动力学

  • 陈赟华
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  • 厦门大学固体表面物理化学国家重点实验室,化学化工学院化学系;

收稿日期: 2008-11-28

  修回日期: 2008-11-28

  网络出版日期: 2008-11-28

Synthesis of the LiFePO_4 by CO Reduction:Reaction Mechanism and Kinetics

  • CHEN Yun-hua
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  • (State Key Lab for Physical Chemistry of Solid Surfaces and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China

Received date: 2008-11-28

  Revised date: 2008-11-28

  Online published: 2008-11-28

摘要

由CO还原FePO4和LiOH前驱体合成LiFePO4正极材料,应用XRD、SEM表征材料结构和形貌、充放电曲线测试电化学性能.结果表明,LiOH过量5%合成的LiFePO4样品颗粒度约200 nm,包覆碳后LiFePO4电极0.1C放电容量可达158 mAh/g.高温现场XRD对该合成反应作实时监控,借助时间分辨图谱分析,检测出Li3Fe2(PO4)3中间物.动力学研究表明成核与生长是该合成过程的速控步骤,反应活化能为89.44 kJ/mol.

本文引用格式

陈赟华 . 一氧化碳还原法制备磷酸铁锂—反应机理和动力学[J]. 电化学, 2008 , 14(4) : 388 -393 . DOI: 10.61558/2993-074X.1927

Abstract

LiFePO4 cathode material was synthesized by CO reducing FePO4 and LiOH precursors.The structure,morphology and electrochemical performances of such LiFePO4 material were characterized by XRD,SEM and charge-discharge tests.It was shown that the particle size of the LiFePO4 synthesized with 5% excess of LiOH in the precursor was about 200 nm.By carbon coating,the LiFePO4 electrode was able to deliver a reversible capacity of 158 mAh·g-1 at 0.1C discharge rate.Temperature-programmed X-ray diffraction was employed to monitor the reaction during the formation of LiFePO4,and Li3Fe2(PO4)3 was found to be an intermediate by analyzing the time-resolved XRD patterns.Kinetic study indicates that nucleation and their growth is the rate-determining step in the process of the reaction and the activation energy of this reaction was 89.44 kJ/mol.
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