锂离子电池正极材料Li0.99Na0.01FePO4/C的结构与电化学性能

doi:10.3724/SP.J.1077.2011.00625

无机材料学报 ›› 2011, Vol. 26 ›› Issue (6): 625-630.DOI: 10.3724/SP.J.1077.2011.00625

锂离子电池正极材料Li_0.99Na_0.01FePO₄/C的结构与电化学性能

龙云飞¹, 王凡¹, 吕小艳², 杨克迪¹, 文衍宣¹

(广西大学1. 化学化工学院; 2. 教务处, 南宁 530004)

收稿日期:2010-08-13 修回日期:2010-10-09 出版日期:2011-06-20 网络出版日期:2011-06-07
作者简介:龙云飞(1964-), 男, 高级工程师. E-mail: longyf@gxu.edu.cn
基金资助:
国家自然科学基金(50474092); 广西省自然科学基金(2011GXNSFA018015)

Electrochemical Characterizations and Structure of Li_0.99Na_0.01FePO₄/C as Cathode Material for Li-ion Battery

LONG Yun-Fei¹, WANG Fan¹, LV Xiao-Yan², YANG Ke-Di¹, WEN Yan-Xuan¹

(1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; 2. Educational Administration Department, Guangxi University, Nanning 530004, China)

Received:2010-08-13 Revised:2010-10-09 Published:2011-06-20 Online:2011-06-07
Supported by:
National Nature Science Foundation of China (50474092); Natural Science Foundation of Guangxi Province (2011GXNSFA018015)

摘要/Abstract

摘要： 为了提高LiFePO₄的倍率性能, 用碳热还原法制备了Na⁺掺杂的LiFePO₄/C复合正极材料, 并用X射线衍射(XRD)、扫描电子显微镜(SEM)、红外光谱(FT-IR)、恒电流充放电技术、循环伏安(CV)和交流阻抗(EIS)研究了Na⁺掺杂对LiFePO₄/C材料的结构、微观形貌和电化学性能的影响. 结果表明, Na⁺掺杂的LiFePO₄/C复合材料具有单一的橄榄石型晶体结构, 不存在杂质衍射峰, Na⁺在Li位掺杂可提高材料的导电性能和Li⁺扩散速率, 降低电极极化, 能有效改善材料的循环性能和倍率性能. 与LiFePO₄/C相比, Li_0.99Na_0.01FePO₄/C的0.5C、2C和5C放电比容量分别为147.6、126.4和105.1 mAh/g, 并表现出良好的循环性能和倍率性能.

关键词: 锂离子电池, 正极材料, LiFePO₄

Abstract: In order to improve the rate performance of lithium iron phosphate, Na⁺ doped LiFePO₄/C cathode materials were prepared by carbothermal reduction technology. Samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transfer infrared spectroscopy (FT-IR), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Their electrochemical performances were investigated by galvanostatic charge/discharge in terms of cycling performance and rate capability. The results show that the samples have well regulated olivine type structures without any impurity peaks. Na-doping improves the conductivity and the Li+ diffusion rate of composite materials and decreases the polarization of electrode, and enhances the cycling performance and rate capability effectively. Compared with LiFePO₄/C, Li_0.99Na_0.01FePO₄/C exhibits good electrode properties with discharge capacities of 147.6, 126.4 and 105.1 mAh/g at 0.5C, 2.0C and 5C rates, respectively. In addition, it has excellent cycle stability at different rates and good performance.

Key words: lithium ion battery, cathode material, LiFePO₄

中图分类号:

TQ911

龙云飞, 王凡, 吕小艳, 杨克迪, 文衍宣. 锂离子电池正极材料Li_0.99Na_0.01FePO₄/C的结构与电化学性能[J]. 无机材料学报, 2011, 26(6): 625-630.

LONG Yun-Fei, WANG Fan, LV Xiao-Yan, YANG Ke-Di, WEN Yan-Xuan. Electrochemical Characterizations and Structure of Li_0.99Na_0.01FePO₄/C as Cathode Material for Li-ion Battery[J]. Journal of Inorganic Materials, 2011, 26(6): 625-630.

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锂离子电池正极材料Li_0.99Na_0.01FePO₄/C的结构与电化学性能

Electrochemical Characterizations and Structure of Li_0.99Na_0.01FePO₄/C as Cathode Material for Li-ion Battery

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