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电化学(中英文) ›› 2015, Vol. 21 ›› Issue (2): 181-186.  doi: 10.13208/j.electrochem.140924

• 研究论文 • 上一篇    下一篇

锂离子电池负极材料Li4Ti5O12的合成及性能研究

张永龙,胡学步*,王耀琼,黄东海   

  1. 重庆理工大学化学化工学院,重庆 400054
  • 收稿日期:2014-09-19 修回日期:2014-12-29 出版日期:2015-04-28 发布日期:2015-04-23
  • 通讯作者: 胡学步 E-mail:xuebu@cqut.edu.cn
  • 基金资助:

    国家自然科学基金项目(No. 21206203,No. 21306235)和重庆市科技人才培养计划(No. cstc2013kjrc-qnrc50006)资助

Syntheses and Electrochemical Performances of Li4Ti5O12 Anode Materials for Lithium Ion Battery

ZHANG Yong-long, HU Xue-bu*, WANG Yao-qiong, HUANG Dong-hai   

  1. College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
  • Received:2014-09-19 Revised:2014-12-29 Published:2015-04-28 Online:2015-04-23
  • Contact: HU Xue-bu E-mail:xuebu@cqut.edu.cn

摘要: 本文通过乙酸锂与二氧化钛反应,采用一步高温固相法在不同反应温度(750 °C/800 °C/850 °C)和反应气氛(氮气/空气)下合成Li4Ti5O12材料. 通过热重分析、X射线衍射、扫描电子显微镜、循环伏安曲线和充放电曲线分析了Li4Ti5O12的晶体结构,观察其微观形貌,并测试其电化学性能. 结果表明,800 °C氮气烧结得到的Li4Ti5O12(L-800N)材料粒径较小,该材料在1.0C倍率下的首周期放电比容量达到170.7 mAh·g-1,100周期循环后的容量保持率高达94.6%,即使是10C高倍率其首周期放电容量依然有143.0 mAh·g-1,表现出了良好的倍率和循环寿命性能.

关键词: Li4Ti5O12, 烧结气氛, 合成温度, 负极材料, 锂离子电池

Abstract: Series of spinel lithium titanate (Li4Ti5O12) materials were synthesized by one-step solid-state reaction using lithium acetate and TiO2 as raw materials under different temperatures (750/800/850 °C) and atmospheres (N2/air). The as-prepared Li4Ti5O12 materials were investigated by thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, cyclic voltammotry and charge-discharge test to analyze their crystal structures, microstructures and electrochemical performances. The results show that the Li4Ti5O12(L-800N)material obtained at 800 °C under nitrogen atmosphere exhibited better electrochemical performance and smaller particle size. The initial discharge specific capacity of the optimized Li4Ti5O12 reached 170.7 mAh·g-1 at 1.0C with the capacity retention of 94.6% after 100 cycles. Even at the current density of 10C, the initial discharge specific capacity of 143.0 mAh·g-1 could be achieved, which demonstrated good high-rate and cycling performances.

Key words: Li4Ti5O12, sintering atmosphere, synthesis temperature, anode material, lithium-ion battery

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