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

doi:10.3724/SP.J.1077.2009.00139

Abstract

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

CLC Number:

TM912

GAO Jian,YING Jie-Rong,JIANG Chang-Yin,WAN Chun-Rong. Preparation of Spherical Nanocrystal LiFePO₄ and Li₄Ti₅O₁₂ and Investigation of the LiFePO₄/Li₄Ti₅O₁₂ Cell[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.00139.

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

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