纳米Al2O3包覆LiFePO4/C正极材料的结构和电化学性能

doi:10.3724/SP.J.1077.2013.13136

无机材料学报 ›› 2013, Vol. 28 ›› Issue (11): 1265-1269.DOI: 10.3724/SP.J.1077.2013.13136

纳米Al₂O₃包覆LiFePO₄/C正极材料的结构和电化学性能

赵世玺¹, 李颖达^{1, 2}, 丁浩^{1, 2}, 李宝华¹, 南策文²

(1. 清华大学深圳研究生院, 深圳518055；2. 清华大学材料科学与工程学院, 北京100084)

收稿日期:2013-03-07 修回日期:2013-05-02 出版日期:2013-11-20 网络出版日期:2013-10-18
基金资助:
Shenzhen Science and Technology Plan Foundation(08LH-03)

Structure and Electrochemical Performance of LiFePO₄/C Cathode Materials Coated with Nano Al₂O₃ for Lithium-ion Battery

ZHAO Shi-Xi¹, LI Ying-Da^1,2, DING Hao^1,2, LI Bao-Hua¹, NAN Ce-Wen²

(1. Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; 2. School of Materials Science and Engineering, Tsinghua University, Beijing100084, China)

Received:2013-03-07 Revised:2013-05-02 Published:2013-11-20 Online:2013-10-18
Supported by:
Shenzhen Science and Technology Plan Foundation(08LH-03)

摘要/Abstract

摘要： 主要研究了纳米氧化铝包覆对磷酸铁锂/C复合正极材料结构和电化学特性的影响。采用溶胶-凝胶方法把纳米氧化铝包覆在商业LiFePO₄/C颗粒表面。研究了Al₂O₃包覆层的量对LiFePO₄电极在室温和高温充放电性能的影响。结果显示：2wt% Al₂O₃包覆层能有效增加电池的循环容量, 能延缓电池在高温条件下充放电的容量衰减, 减小电极的界面阻抗。这归因于氧化铝包覆层对磷酸铁锂晶粒的表面起保护作用, 减少电解液对磷酸铁锂晶粒表面的腐蚀, 从而改善循环过程中磷酸铁锂的表面结构的完整和稳定, 确保锂离子扩散通道的畅通。

关键词: 锂离子电池, 正极材料, 磷酸铁锂, 纳米氧化铝包覆

Abstract: The structure and electrochemical performance of Al₂O₃-coated LiFePO4 cathode materials were investigated. A nano Al₂O₃ coating on the surface of commercial LiFePO₄/C particles (Aleees Inc.) was prepared by using the Sol-Gel method. The effect of the amount of Al₂O₃ coating on the electrochemical performance and structural stability of LiFePO₄ electrodes at room temperature (25℃) and elevated temperatures (55℃) was studied. The results show that 2wt% Al₂O₃ coating can effectively enhance the cycling capacity, alleviate capacity fading at high temperature and reduce cell impedance. It is largely attributed to Al₂O₃ coating, which plays a regulatory role of lithium-ion inserting the lattice and preventing direct contact between the cathode material and the electrolyte, and improves the structural stability of LiFePO₄during cycles.

Key words: lithium-ion battery, cathode materials, LiFePO₄, nano Al₂O₃ coating

中图分类号:

TQ174

赵世玺, 李颖达, 丁浩, 李宝华, 南策文. 纳米Al₂O₃包覆LiFePO₄/C正极材料的结构和电化学性能[J]. 无机材料学报, 2013, 28(11): 1265-1269.

ZHAO Shi-Xi, LI Ying-Da, DING Hao, LI Bao-Hua, NAN Ce-Wen. Structure and Electrochemical Performance of LiFePO₄/C Cathode Materials Coated with Nano Al₂O₃ for Lithium-ion Battery[J]. Journal of Inorganic Materials, 2013, 28(11): 1265-1269.

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纳米Al₂O₃包覆LiFePO₄/C正极材料的结构和电化学性能

Structure and Electrochemical Performance of LiFePO₄/C Cathode Materials Coated with Nano Al₂O₃ for Lithium-ion Battery

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