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电化学(中英文) ›› 2011, Vol. 17 ›› Issue (3): 334-338.  doi: 10.61558/2993-074X.2850

• 研究论文 • 上一篇    下一篇

包覆碳掺CoLiFePO4正极的电化学性能研究

白莹, 杨觉明, 卿春波, 张伟风*   

  1. 河南省光伏材料重点实验室,河南大学物理与电子学院,河南,开封 475004
  • 收稿日期:2011-03-31 修回日期:2011-06-10 出版日期:2011-08-28 发布日期:2011-07-05
  • 通讯作者: 张伟风 E-mail:wfzhang@henu.edu.cn
  • 基金资助:

    国家自然科学基金(50902044, 60976016),河南省创新人才培养工程(2002006),河南省教育厅自然科学基金(2010B480004)和河南大学自然科学基金(2008YBZR018)

Electrochemical performances of C-coating and Co-doping LiFePO4

 BAI  Ying, YANG  Jue-Ming, QING  Chun-Bo, ZHANG  Wei-Feng*   

  1. Key Laboratory of Photovoltaic Materials of Henan Province and School of Physics & Electronics, Henan University, Kaifeng 475004, Henan, China
  • Received:2011-03-31 Revised:2011-06-10 Published:2011-08-28 Online:2011-07-05
  • Contact: ZHANG Wei-Feng E-mail:wfzhang@henu.edu.cn

摘要: 应用水热法在200 oC下合成了橄榄石结构LiFePO4正极材料,合成过程中添加蔗糖作为包覆用碳源,并同时掺Co. 实验表明,包覆碳掺Co能更有效地改善LiFePO4电极的电化学性能. 样品可后退火处理,400 oC 退火LiFePO4样品结晶度和颗粒尺寸均影响了其电化学性能,包覆碳掺CoLiFePO4样品可使颗粒细化,改善电极倍率性能.

关键词: 锂离子电池, LiFePO4, 碳包覆, Co掺杂, 颗粒大小

Abstract: Phospho-olivine LiFePO4 cathode materials were prepared by hydrothermal reaction at 200 oC. Sucrose was added as C-coating resource and Co was doped into the crystal lattice of LiFePO4. In order to investigate the improvements in the electrochemical properties of Co-doped LiFePO4, three samples, LiFePO4, C-coated LiFePO4 and C-coating-Co-doped LiFePO4, were synthesized under the same preparation conditions. Charge/discharge studies reveal that the Co-doped LiFePO4/C composite annealed at 400 oC exhibits marked improvement of specific capacity by diminishing the particle sizes and enhancement in the degree of crystallinity. The C-coating and Co-doped into the LiFePO4 crystal lattices improve the rate performance through the reduction of the particle sizes.

Key words: lithium ion batteries, cathode material, carbon-coating, Co-doping, particle size

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