研究论文

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
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  • 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

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

Received date: 2008-03-19

  Revised date: 2008-05-18

  Online published: 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.

本文引用格式

高 剑 , 应皆荣 , 姜长印 , 万春荣 . 球形纳米晶LiFePO4和Li4Ti5O12的制备及电池研究[J]. 无机材料学报, 2009 , 24(1) : 139 -142 . DOI: 10.3724/SP.J.1077.2009.00139

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.

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