锂离子电池负极材料Ge4+掺杂Li4Ti5O12的制备及其电化学性能研究

doi:10.3724/SP.J.1077.2013.12525

无机材料学报 ›› 2013, Vol. 28 ›› Issue (7): 727-732.DOI: 10.3724/SP.J.1077.2013.12525 CSTR: 32189.14.SP.J.1077.2013.12525

锂离子电池负极材料Ge⁴⁺掺杂Li₄Ti₅O₁₂的制备及其电化学性能研究

邱彩霞¹, 袁中直¹, 刘玲¹, 程思洁¹, 刘金成²

(1. 华南师范大学化学与环境学院, 广州510006; 2. 惠州亿纬锂能股份有限公司, 惠州516006)

收稿日期:2012-08-28 修回日期:2012-10-08 出版日期:2013-07-20 网络出版日期:2013-06-19
作者简介:邱彩霞(1988–), 女, 硕士研究生.
基金资助:
广东省科技计划项目(2012B010200040); 广东省粤港招标重点项目(2010A090602001)

Preparation and Characterization of Ge⁴⁺-doping Li₄Ti₅O₁₂ Anode Material for Li-ion Battery and Its Electrochemical Properties

QIU Cai-Xia¹, YUAN Zhong-Zhi¹, LIU Ling¹, CHENG Si-Jie¹, LIU Jin-Cheng²

(1. School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; 2. EVE Energy Co. Ltd, Huizhou 516006, China)

Received:2012-08-28 Revised:2012-10-08 Published:2013-07-20 Online:2013-06-19
About author:袁中直, 教授. E-mail: yuanzz@scnu.edu.cn
Supported by:
Science and Technology Project of Guangdong Province (2012B010200040); Guangdong-Hongkong Key Bidding Project of Guangdong Province (2010A090602001)

摘要/Abstract

摘要： 以Ti(OC₄H₉)₄、CH₃COOLi·2H₂O和GeO₂为原料, 采用溶胶-凝胶法合成了尖晶石型Li₄Ti_5-xGe_xO₁₂(x=0、0.05、0.1、0.15)电极材料。通过X射线衍射(XRD)、扫描电镜(SEM)、充放电测试、循环伏安(CV)以及交流阻抗对材料进行结构、形貌及电化学性能表征。研究结果表明, 适量Ge⁴⁺掺杂不会改变Li₄Ti₅O₁₂的尖晶石结构, 但对其颗粒尺寸和形貌均产生影响。由于掺Ge⁴⁺后样品的颗粒尺寸减小, 使得Ge⁴⁺掺杂Li₄Ti₅O₁₂倍率性得到不同程度的提高。其中Li₄Ti_4.9Ge_0.1O₁₂显示出较好的倍率性和循环稳定性, 0.2C下的首次放电容量为172.43 mAh/g, 5C下循环100次后比容量为140.62 mAh/g, 容量保持率为97.3%。

关键词: 锂离子电池, Li₄Ti₅O₁₂, Ge⁴⁺掺杂, 倍率性

Abstract: The spinel Li₄Ti_5-xGe_xO₁₂ (x=0, 0.05, 0.1, 0.15) electrode materials were successfully synthesized by Sol-Gel method using Ti(OC₄H₉)₄, CH₃COOLi•2H₂O and GeO₂ as raw materials. The crystalline structure, morphology and electrochemical properties of the obtained materials were characterized by XRD, SEM, half cell charge-discharge tests, cyclic voltammetry (CV) and AC impedance. The results showed that doping with certain amount of Ge⁴⁺ did not change the basic structure of Li4Ti5O12, but greatly affected its mophology and particle size. Ge-doped Li₄Ti₅O₁₂ has relatively high rate capability due to the smaller particle size. In this study, Li₄Ti_4.9Ge_0.1O₁₂ represented the highest initial discharge capacity and the best cycling performance among all samples. At the charge-discharge rate of 0.2C, its first discharge capacity was 172.43 mAh/g, and at 5C rate, its discharge capacity remained at 140.62 mAh/g after 100 cycles with a capacity retention of 97.3%.

Key words: Li-ion battery, Li₄Ti₅O₁₂, Ge⁴⁺-doping, rate performance

中图分类号:

TQ174

邱彩霞, 袁中直, 刘玲, 程思洁, 刘金成. 锂离子电池负极材料Ge⁴⁺掺杂Li₄Ti₅O₁₂的制备及其电化学性能研究[J]. 无机材料学报, 2013, 28(7): 727-732.

QIU Cai-Xia, YUAN Zhong-Zhi, LIU Ling, CHENG Si-Jie, LIU Jin-Cheng. Preparation and Characterization of Ge⁴⁺-doping Li₄Ti₅O₁₂ Anode Material for Li-ion Battery and Its Electrochemical Properties[J]. Journal of Inorganic Materials, 2013, 28(7): 727-732.

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锂离子电池负极材料Ge⁴⁺掺杂Li₄Ti₅O₁₂的制备及其电化学性能研究

Preparation and Characterization of Ge⁴⁺-doping Li₄Ti₅O₁₂ Anode Material for Li-ion Battery and Its Electrochemical Properties

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