烧结方式对LiFePO4/C复合正极材料电化学性能的影响

doi:10.3724/SP.J.1077.2012.11576

无机材料学报 ›› 2012, Vol. 27 ›› Issue (8): 838-842.DOI: 10.3724/SP.J.1077.2012.11576

烧结方式对LiFePO₄/C复合正极材料电化学性能的影响

牟菲^{1, 2}, 杨学林¹, 代忠旭², 张露露¹, 温兆银³

(1. 三峡大学机械与材料学院, 宜昌 443002; 2. 三峡大学化学与生命科学学院, 宜昌 443002; 3. 中国科学院上海硅酸盐研究所, 上海 200050)

收稿日期:2011-09-09 修回日期:2011-11-11 出版日期:2012-08-20 网络出版日期:2012-07-09
作者简介:牟菲(1985-), 女, 硕士研究生.
基金资助:
国家自然科学基金(50972075); 教育部科学技术研究重点项目(209083)

Effect of Sintering-method on Electrochemical Performance of LiFePO₄/C Cathode Material

MOU Fei^1,2, YANG Xue-Lin¹, DAI Zhong-Xu², ZHANG Lu-Lu¹, WEN Zhao-Yin³

(1. College of Mechanical and Material Engineering, China Three Gorges University, Yichang 443002, China; 2. College of Chemistry and Life Science, China Three Gorges University, Yichang 443002, China; 3. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)

Received:2011-09-09 Revised:2011-11-11 Published:2012-08-20 Online:2012-07-09
About author:MOU Fei.
Supported by:
National Natural Science Foundation of China (50972075); Key Project of Ministry of Education (209083)

摘要/Abstract

摘要： 对LiFePO₄/C复合前驱体, 分别采用静态氮气气氛, 动态氮气气氛及静态真空三种烧结方式进行碳热还原合成LiFePO₄/C复合正极材料. 采用XRD、SEM、CV和充放电循环测试等方法分析和表征材料的结构、形貌和电化学性能. 结果表明, 烧结方式对所得材料的结晶度、晶粒大小、碳含量、合成温度以及电化学性能均有显著影响. 真空烧结所得材料结晶度高, 而动态气氛烧结对材料颗粒细化及均匀化都有积极影响, 同时也能有效促进锂离子扩散动力学. 动态气氛烧结可将材料的烧结温度降低到500℃, 且所得材料表现出优异的电化学性能. 0.5C倍率下循环首次放电比容量达到163.4 mAh/g, 50次循环后容量保持率为99.02%.

关键词: 烧结, LiFePO₄/C, 锂离子电池, 正极材料, 电化学性能

Abstract: Static nitrogen atmospheres (SA), dynamic nitrogen atmosphere (DA) and static vacuum (SV) sintering methods were adopted to synthesize LiFePO₄/C cathode material. The crystalline structure, morphology and electrochemical performances of the products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and galvanostatic charge/discharge test. Effects of sintering method on crystallinity, particle size, carbon content, reaction temperature and electrochemical performance of the as-obtained LiFePO₄/C cathode material are remarkable. SV-sintered LiFePO₄/C have better crystalline, but DA-sintering is helpful to obtain LiFePO₄/C particles with smaller particle size and narrower particle size distribution, kinetics of Li+ diffusion is also improved. For the DA-sintered sample, sintering temperature can be reduced to 500℃ with excellent electrochemical performance. Specific discharge capacity for the first cycle reaches 163.4 mAh/g at 0.5C rate, and up to 99.02% of discharge capacity can be kept after 50 cycles.

Key words: sintering, LiFePO₄/C, lithium ion batteries, cathode material, electrochemical performance

中图分类号:

O613

牟菲, 杨学林, 代忠旭, 张露露, 温兆银. 烧结方式对LiFePO₄/C复合正极材料电化学性能的影响[J]. 无机材料学报, 2012, 27(8): 838-842.

MOU Fei, YANG Xue-Lin, DAI Zhong-Xu, ZHANG Lu-Lu, WEN Zhao-Yin. Effect of Sintering-method on Electrochemical Performance of LiFePO₄/C Cathode Material[J]. Journal of Inorganic Materials, 2012, 27(8): 838-842.

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烧结方式对LiFePO₄/C复合正极材料电化学性能的影响

Effect of Sintering-method on Electrochemical Performance of LiFePO₄/C Cathode Material

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