粒径可控纳米LiFePO4/C的制备及其电化学性能研究

doi:10.13208/j.electrochem.130362

电化学（中英文） ›› 2013, Vol. 19 ›› Issue (6): 550-557. doi: 10.13208/j.electrochem.130362

• 锂离子电池近期研究专辑 (厦门大学杨勇教授主编) • 上一篇下一篇

粒径可控纳米LiFePO₄/C的制备及其电化学性能研究

王明娥，刘敬源，侯孟炎，夏永姚^*

复旦大学化学系，上海市分子催化和功能材料重点实验室，上海 200433

收稿日期:2013-06-25 修回日期:2013-08-28 出版日期:2013-12-28 发布日期:2013-12-23
通讯作者: 夏永姚 E-mail:yyxia@fudan.edu.cn
基金资助:
国家自然科学基金重点项目（20925312）资助

Preparation of the Particle Size Controllable LiFePO₄/C and Its Electrochemical Profile Characterization

WANG Ming-e, LIU Jing-yuan, HOU Meng-yan, XIA Yong-yao^*

Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China

Received:2013-06-25 Revised:2013-08-28 Published:2013-12-28 Online:2013-12-23
Contact: XIA Yong-yao E-mail:yyxia@fudan.edu.cn

摘要/Abstract

摘要： LiFePO₄电极的倍率特性与材料的粒度和电子导电性有很大关系. 采用共沉淀方法，调控预处理温度，将3种不同尺寸的FePO₄前驱体通过表面修饰对-羟基苯甲酸的聚合物，可合成不同尺度的LiFePO₄/C材料，分别为80 nm、200 nm和 1 μm. 纳米尺度LiFePO₄-a/C电极，30C放电比容量达到了100 mAh·g^-1，而微米级LiFePO₄-c/C电极放电比容量仅为54 mAh·g^-1. 均一碳包覆的LiFePO₄/C电极表现出强抗氧化性，不仅提高其导电性，还可防止材料氧化.

关键词: LiFePO₄, 锂离子电池, 正极材料, 原位合成

Abstract: We adopted an effective route to prepare the particle size controllable core-shell structure carbon-coated LiFePO4 from different sized FePO4 precursors, varying from 80 nm, 200 nm and 1 μm by an in situ polymerization method integrated with a surface modification technology. The discharge capacities of the three sized LiFePO₄/C are, respectively, 162 mAh·g^-1, 142 mAh·g^-1 and 92 mAh·g^-1 at 0.1C rate. The nano-sized LiFePO₄-a/C (80 nm) delivers a discharge capacity as large as 100 mAh·g^-1 even at 30C, while the macroscopic LiFePO₄-c/C (1 μm) exhibits a much poorer discharge capacity of 54 mAh·g^-1 under the same current density. The carbon coated LiFePO₄ (LiFePO₄/C) also shows good chemical stability after the exposure to air atmosphere, in which the uniform carbon layer could prevent the LiFePO₄ from reacting with H₂O and O₂.

Key words: LiFePO4 , Lithium-ion batteries, cathode materials, in-situ synthesis

中图分类号:

O646

王明娥，刘敬源，侯孟炎，夏永姚*. 粒径可控纳米LiFePO₄/C的制备及其电化学性能研究[J]. 电化学（中英文）, 2013, 19(6): 550-557.

WANG Ming-e, LIU Jing-yuan, HOU Meng-yan, XIA Yong-yao*. Preparation of the Particle Size Controllable LiFePO₄/C and Its Electrochemical Profile Characterization[J]. Journal of Electrochemistry, 2013, 19(6): 550-557.

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粒径可控纳米LiFePO₄/C的制备及其电化学性能研究

Preparation of the Particle Size Controllable LiFePO₄/C and Its Electrochemical Profile Characterization

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