高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

复合物LiFePO4/CaB6的结构与性能研究

刘善科1, 董全峰1,2, 郑明森1, 金明钢2, 詹亚丁1,2, 林祖赓1,2, 孙世刚1   

    1. 厦门大学固体表面物理化学国家重点实验室, 化学化工学院化学系;
    2. 厦门大学宝龙电池研究所, 厦门 361005
  • 收稿日期:2006-04-13 修回日期:1900-01-01 出版日期:2007-02-10 发布日期:2007-02-10
  • 通讯作者: 董全峰

Structure and Performance of LiFePO4/CaB6 Composites

LIU Shan-Ke1, DONG Quan-Feng1,2, ZHENG Ming-Shen1, JIN Ming-Gang2, ZHAN Ya-Ding1,2, LIN Zu-Geng1,2, SUN Shi-Gang1   

    1. State Key Laboratory for Physical Chemistry of Solid Surface, College of Chemistry and Chemical Engineering,
    2. PowerLong Battery Institute, Xiamen University, Xiamen 361005, China
  • Received:2006-04-13 Revised:1900-01-01 Online:2007-02-10 Published:2007-02-10
  • Contact: DONG Quan-Feng

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摘要： 采用固相法合成了纯的LiFePO4, 并通过两种不同的方法合成了不同CaB6含量的复合物LiFePO4/CaB6. 对这些产物进行了粒度、形貌、电导率、振实密度、X射线衍射和充放电性能的研究. 实验结果表明, CaB6的掺入虽然没有明显地提高产物的比容量, 但却显著地增加了产物的振实密度和电导率. 第二种方法合成的产物性能更好, 其电导率提高了5个数量级, 振实密度提高了65%.

关键词: 复合物LiFePO4/CaB6, 电导率, 振实密度, 晶胞参数, 比容量

Abstract: In order to improve the electric conductivity and tap density of lithium iron phosphate, CaB6 was used as a new additive for the first time. LiFePO4 was synthesized by solid sate reaction and LiFePO4/CaB6 composite with different contents of CaB6 was prepared by two different methods. The samples were characterized by granularity, morphology, electric conductivity, tap density, X-ray diffraction and charge-discharge performance. The results show that although the specific capacity of these materials doped with CaB6 was not improved significantly, the tap density and electronic conductivity of these composites increased. The samples synthesized by the second method exhibit much better performance, and the electronic conductivity of the materials is enhanced by five orders of magnitude and the tap density by 65%.

Key words: LiFePO4/CaB6 composite, Electronic conductivity, Tap density, Unit cell parameter, Specific capacity

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