锂离子电池负极材料Li4Ti5O12的合成及性能研究

doi:10.13208/j.electrochem.140924

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

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

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

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/Abstract

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

中图分类号:

O646
TM911

张永龙，胡学步*，王耀琼，黄东海. 锂离子电池负极材料Li₄Ti₅O₁₂的合成及性能研究[J]. 电化学（中英文）, 2015, 21(2): 181-186.

ZHANG Yong-long, HU Xue-bu*, WANG Yao-qiong, HUANG Dong-hai. Syntheses and Electrochemical Performances of Li₄Ti₅O₁₂ Anode Materials for Lithium Ion Battery[J]. Journal of Electrochemistry, 2015, 21(2): 181-186.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.140924

https://electrochem.xmu.edu.cn/CN/Y2015/V21/I2/181

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锂离子电池负极材料Li₄Ti₅O₁₂的合成及性能研究

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

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