锂离子电池Li4Ti5O12负极材料的尿素掺杂氮化修饰

doi:10.3724/SP.J.1077.2010.00983

摘要/Abstract

摘要：

Li₄Ti₅O₁₂是最具前景的混合电动汽车用锂离子动力电池负极材料之一. 为了提高其倍率性能, 以尿素为氮源对Li₄Ti₅O₁₂进行掺杂热处理, 以在Li₄Ti₅O₁₂颗粒表面自生长一层高电导TiN修饰膜, 利用X射线衍射仪、扫描电镜、透射电镜、X射线能谱仪、Raman光谱仪和半电池充放电测试仪研究了材料的物相、结构、形貌、成分以及电化学性能. 结果表明: 氮化修饰Li₄Ti₅O₁₂样品与未修饰样品具有相同的尖晶石Li₄Ti₅O₁₂的衍射峰, 氮化修饰后Li₄Ti₅O₁₂颗粒表面自生长了一层均匀的薄膜, 该薄膜不仅含有N元素, 而且还具有TiN的Raman光谱特征振动峰;氮化修饰Li₄Ti₅O₁₂样品的0.1 C首次放电比容量比未修饰Li₄Ti₅O₁₂样品有所降低, 但是却展示了优异的电化学倍率性能和循环性能, 3 C倍率充放电比容量是未修饰Li₄Ti₅O₁₂样品的2.6倍, 0.1 C充放电循环100次后其容量损失仅3%.

关键词: 锂离子电池, Li₄Ti₅O₁₂负极材料, Li₄Ti₅O₁₂/TiN复合材料, 尿素

Abstract:

Li₄Ti₅O₁₂ is the most potential candidate anode material of lithium-ion power battery for hybrid electric vehicles. In order to improve its rate performance, through doping and heat treatment on Li₄Ti₅O₁₂ with urea as nitrogen source, TiN high electrical conducting layer was prepared by in-situ selfgrowing on the surface of Li₄Ti₅O₁₂particles. The crystalline structure, morphology, composition and electrochemical properties were studied by XRD, SEM, TEM, EDS, Raman spectra and half cell charge/discharge performance testing. The results show that nitridated Li₄Ti₅O₁₂powers have the same diffraction peak positions of the spinel structure of Li₄Ti₅O₁₂ with pristine Li₄Ti₅O₁₂, and it is observed the presence of nitrogen and Raman feature vibration bands of TiN in in-situ selfgrowing a homogeneously layer on the surface of Li₄Ti₅O₁₂ particles. The first discharge specific capacity of nitridated Li₄Ti₅O₁₂samples slightly decreases than pristine Li₄Ti₅O₁₂ samples at 0.1C rate. However, the discharge specific capacity of the nitridated Li₄Ti₅O₁₂ samples is 1.6 times higher than that of the pristine Li₄Ti₅O₁₂ samples at 3C rate charge and discharge, and the capacity loss of them is only 3% at 0.1C rate after 100 cycle numbers. The results illuminate the nitridated Li₄Ti₅O₁₂samples have good electrochemical rate performances and cycling behavior.

Key words: lithium-ion battery, Li₄Ti₅O₁₂ anode materials, L_i4Ti₅O₁₂/TiN composite materials, urea

中图分类号:

O611
O614

高宏权, 王新宇, 张治安, 赖延清, 李劼, 刘业翔. 锂离子电池Li₄Ti₅O₁₂负极材料的尿素掺杂氮化修饰[J]. 无机材料学报, 2010, 25(9): 983-988.

GAO Hong-Quan, WANG Xin-Yu, ZHANG Zhi-An, LAI Yan-Qing, LI Jie, LIU Ye-Xiang. Modification of Li₄Ti₅O₁₂ Anode Material with Urea as Nitrogen Source for Lithium Ion Battery[J]. Journal of Inorganic Materials, 2010, 25(9): 983-988.

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锂离子电池Li₄Ti₅O₁₂负极材料的尿素掺杂氮化修饰

Modification of Li₄Ti₅O₁₂ Anode Material with Urea as Nitrogen Source for Lithium Ion Battery

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