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

doi:10.3724/SP.J.1077.2010.00983

Abstract

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

CLC Number:

O611
O614

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

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