Li4Ti4.95Al0.05O12/C复合负极材料的制备及电性能研究

doi:10.3724/SP.J.1077.2012.12246

无机材料学报 ›› 2012, Vol. 27 ›› Issue (12): 1251-1255.DOI: 10.3724/SP.J.1077.2012.12246 CSTR: 32189.14.SP.J.1077.2012.12246

Li₄Ti_4.95Al_0.05O₁₂/C复合负极材料的制备及电性能研究

董红玉^1,2,3, 张治军¹, 尹艳红^2,3, 杨书廷^2,3

(1. 河南大学特种功能材料教育部重点实验室, 开封475004; 2. 河南师范大学化学与化工学院, 新乡453007; 3. 河南省动力电池及关键材料工程技术研究中心, 新乡453007)

收稿日期:2012-04-19 修回日期:2012-06-18 出版日期:2012-12-20 网络出版日期:2012-11-19
作者简介:董红玉(1979–), 女, 博士研究生. E-mail: hongyudong9@foxmail.com
基金资助:
国家自然科学基金(21001041)

Preparation and Electrochemical Performance of Li₄Ti_4.95Al_0.05O₁₂/C Anode Materials

DONG Hong-Yu^1,2,3, ZHANG Zhi-Jun¹, YIN Yan-Hong^2,3, YANG Shu-Ting^2,3

(1. Key Laboratory of Ministry of Education for Special Functional Materials, Henan University, Kaifeng 475004, China; 2.School of Chemistry and Enginearing, Henan Normal University, Xinxiang 453007, China; 3. Henan Engineering Research Center of Motive Power and Key Materials, Xinxiang 453007, China)

Received:2012-04-19 Revised:2012-06-18 Published:2012-12-20 Online:2012-11-19
About author:DONG Hong-Yu. E-mail: hongyudong9@foxmail.com
Supported by:
National Natural Science Foundation of China(21001041)

摘要/Abstract

摘要： Li₄Ti₅O₁₂是具有良好应用前景的锂离子电池负极材料之一. 本研究以聚丙烯酰胺(PAM)为模板剂和碳源, 采用改进的固相合成法制备锂离子电池负极材料Li₄Ti_4.95Al_0.05O₁₂和Li₄Ti_4.95Al_0.05O₁₂/C. 利用X射线衍射仪、场发射扫描电镜等测试手段表征材料的物相结构和形貌. 结果表明: Al掺杂未改变Li₄Ti₅O₁₂的尖晶石结构, 合成过程中PAM模板剂的引入能够有效调控材料微观形貌并降低颗粒团聚程度. 采用恒流充放电和交流阻抗测试材料的电化学性能, Li₄Ti_4.95Al_0.05O₁₂/C复合材料的比容量和循环性能得到明显改善, 0.2C倍率下首次充放电比容量分别达到159.2和160.8 mAh/g, 5C倍率时仍有较好的循环性能.

关键词: Li₄Ti₅O₁₂, 掺杂, 电性能, 交流阻抗

Abstract: Li₄Ti₅O₁₂ is a promising anode electrode material in Lithium ion batteries. Using polyacrylamide as template and carbon source, spinel Li₄Ti_4.95Al_0.05O₁₂ and Li₄Ti_4.95Al_0.05O₁₂/C were successfully synthesized by modified solid state method. The results of X-ray diffraction (XRD) and Field-emission scanning electron microscopy show that highly crystalline Li₄Ti_4.95Al_0.05O₁₂ and Li₄Ti_4.95Al_0.05O₁₂/C materials without any impurity are obtained. The shape and size of particles are modified by polyacrylamide. The electrochemical performances of materials are investigated in the range of 1.0–2.5 V. The Li₄Ti_4.95Al_0.05O₁₂/C presents a higher specific capacity and better cycling stability than Li₄Ti_4.95Al_0.05O₁₂. The charge and discharge specific capacity of Li₄Ti_4.95Al_0.05O₁₂/C material are 159.2 and 160.8 mAh/g at 0.2C rate.

Key words: Li₄Ti₅O₁₂, doping, electrochemical performance, AC impedance

中图分类号:

TQ912

董红玉, 张治军, 尹艳红, 杨书廷. Li₄Ti_4.95Al_0.05O₁₂/C复合负极材料的制备及电性能研究[J]. 无机材料学报, 2012, 27(12): 1251-1255.

DONG Hong-Yu, ZHANG Zhi-Jun, YIN Yan-Hong, YANG Shu-Ting. Preparation and Electrochemical Performance of Li₄Ti_4.95Al_0.05O₁₂/C Anode Materials[J]. Journal of Inorganic Materials, 2012, 27(12): 1251-1255.

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Li₄Ti_4.95Al_0.05O₁₂/C复合负极材料的制备及电性能研究

Preparation and Electrochemical Performance of Li₄Ti_4.95Al_0.05O₁₂/C Anode Materials

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