复合正极材料LiFePO4/Al/C的制备及性能研究

doi:10.3724/SP.J.1077.2012.11719

无机材料学报 ›› 2012, Vol. 27 ›› Issue (10): 1030-1034.DOI: 10.3724/SP.J.1077.2012.11719 CSTR: 32189.14.SP.J.1077.2012.11719

复合正极材料LiFePO₄/Al/C的制备及性能研究

陈威^1,2, 彭文杰¹, 王志兴¹

(1. 中南大学冶金科学与工程学院, 长沙 410083; 2．湖南杉杉户田新材料有限公司, 长沙 410205)

收稿日期:2011-11-15 修回日期:2011-12-31 出版日期:2012-10-20 网络出版日期:2012-09-17
基金资助:
长沙高新技术开发区项目(K0904114-11)

Synthesis and Characterization of LiFePO₄/Al/C Composite Cathode Material

CHEN Wei^1,2, PENG Wen-Jie¹, WANG Zhi-Xing¹

(1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China; 2. Hunan Shanshan Toda Advanced Material Co. Ltd., Changsha 410205, China)

Received:2011-11-15 Revised:2011-12-31 Published:2012-10-20 Online:2012-09-17
Supported by:
Project of High and New Technology Development Zone of Changsha(K0904114-11)

摘要/Abstract

摘要： 采用二步固相法制备了LiFePO₄/Al/C复合正极材料. 利用X射线衍射仪、扫描电镜和透射电镜表征样品的晶体结构、形貌、粒径和包覆状态, 并研究了铝粉加入量对复合材料电化学性能的影响. 结果表明, 金属Al与LiFePO₄发生了界面反应, 生成多种副产物, 并在LiFePO₄的表面形成钝化膜. 在LiFePO₄颗粒的表面包覆有不规则形状的金属铝和1~2 nm的碳层. 当铝粉加入量为3wt%时, LiFePO4/Al/C复合材料的电化学性能最佳, 室温10C倍率下放电克容量为117.8 mAh/g; 样品在-20℃下, 0.1C放电克容量为105.6 mAh/g, 相对于常温的放电容量比率为73.8%.

关键词: 磷酸铁锂, 复合正极材料, 铝, 碳包覆

Abstract: LiFePO4/Al/C composite cathode materials were synthesized by two-step solid-state method. The crystalline structure, morphology, the particle size and the coated state of the samples were characterized by XRD, SEM and TEM. The effect of the amounts of Al powder on the electrochemical properties of the composite was investigated. The results show that the interface reaction occurs between metal Al and LiFePO₄, resulting in the formation of several by-products and the passive film on the surface of LiFePO₄. The surface of LiFePO₄ particles are coated by the irregularly shaped metal Al and a thin carbon layer of 1-2 nm. The LiFePO₄/Al/C containing 3wt% Al shows the best electrochemical performances, with discharge specific capacity of 117.8 mAh/g at 25℃ and 10C rate, and discharge specific capacity of 105.6 mAh/g at -20℃ and 0.1C rate, and discharge capacity of samples at -20℃ is 73.8% of that of samples at 25℃.

Key words: lithium iron phosphate, composite cathode material, aluminium, carbon coating

中图分类号:

TM912

陈威, 彭文杰, 王志兴. 复合正极材料LiFePO₄/Al/C的制备及性能研究[J]. 无机材料学报, 2012, 27(10): 1030-1034.

CHEN Wei, PENG Wen-Jie, WANG Zhi-Xing. Synthesis and Characterization of LiFePO₄/Al/C Composite Cathode Material[J]. Journal of Inorganic Materials, 2012, 27(10): 1030-1034.

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复合正极材料LiFePO₄/Al/C的制备及性能研究

Synthesis and Characterization of LiFePO₄/Al/C Composite Cathode Material

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