球形纳米晶LiFePO4和Li4Ti5O12的制备及电池研究

无机材料学报, 2009, 24(1): 139-142. doi: 10.3724/SP.J.1077.2009.00139

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

清华大学核能与新能源技术研究院，北京 102201

Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 102201, China

关键词：锂离子电池 , LiFePO₄ , Li₄Ti₅O₁₂ , spherical

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

Keywords： lithium-ion battery , LiFePO₄ , Li₄Ti₅O₁₂ , 球形

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.

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.

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