无机材料学报

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球形纳米晶LiFePO4和Li4Ti5O12的制备及电池研究

高 剑, 应皆荣, 姜长印, 万春荣   

  1. 清华大学 核能与新能源技术研究院,北京 102201
  • 收稿日期:2008-03-19 修回日期:2008-05-18 出版日期:2009-01-20 网络出版日期:2009-01-20

Preparation of Spherical Nanocrystal LiFePO4 and Li4Ti5O12 and Investigation of the LiFePO4/Li4Ti5O12 Cell

GAO Jian, YING Jie-Rong, JIANG Chang-Yin, WAN Chun-Rong   

  1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 102201, China
  • Received:2008-03-19 Revised:2008-05-18 Published:2009-01-20 Online:2009-01-20

摘要: 分别通过“控制结晶”和“外凝胶”工艺合成了球形纳米晶LiFePO4/C和Li4 Ti5O12/C材料.通过XRD、SEM、比表面及电化学性能测试等分析手段表明,合成的LiFePO4/C和Li4Ti5O12/C材料均为纳米一次粒子(晶粒)组成的球形二次粒子(颗粒),具有较大的比表面积,振实密度分别达到1.25和1.71g/cm3;1C倍率下的首次放电比容量分别达到144.0和144.2mAh/g,并表现出优良的循环性能.以LiFePO4/C和Li4Ti5O12/C为正负极材料组成的1.8V锂离子电池具有平稳的充放电电压平台和优异的循环性能.

关键词: 锂离子电池, LiFePO4, Li4Ti5O12, 球形

Abstract: The spherical nanocrystal LiFePO4/C and Li4Ti5O12/C are synthesized via “controlled crystallization” and “outer gel” technics, respectively. XRD, SEM, BET testing and the determination of the electrochemical properties show that the LiFePO4/C and Li4Ti5O12/C particles are spherical nanocrystals. The products exhibit great specific surface area. The tap-densities of spherical LiFePO4/C and Li4Ti5O12/C powders are as high as 1.25 and 1.71g/cm3, respectively. The initial discharge specific capacities of the LiFePO4/C and Li4Ti5O12/C reach 144.0 and 144.2mAh/g at 1C rate. The materials also exhibit excellent cycle performance. A 1.8 V lithium-ion battery composed of LiFePO4/C and Li4Ti5O12/C shows a quite flat operating voltage of 1.8V with excellent cycleability.

Key words: lithium-ion battery, LiFePO4, Li4Ti5O12, spherical

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