Effect ofHeat-treatment Temperature on the Structure and Properties of Li4Ti5O12Nanorods Prepared by the Hydrothermal Ion Exchange Method

doi:10.3724/SP.J.1077.2011.00123

Abstract

Abstract: Li₄Ti₅O₁₂nanorods were prepared by hydrothermal ion exchange method. The weight lossprocess of Li₄Ti₅O₁₂ during the heat treatmentwas studied by thermogravimetric method (TG). The structure and composition ofthe samples obtained at different hydrothermal temperatures (150℃ and180℃) and different heat-treatment temperatures (600℃, 750℃ and900℃) were characterized by X-ray diffraction (XRD) andtransmission electron microscope (TEM). The electrochemical performances wereevaluated by means of various techniques including galvanostaticcharge/discharge tests and cycle voltammetry (CV) in terms of cyclingperformance and rate capability. The results indicate that Li₄Ti₅O₁₂nanorods can be synthesized after hydrothermal reaction at 180℃ by theway of ion exchanges. The first specific discharge capacity of the samples heat-treatedat 750℃ is 164 mAh/g with retention ratio of 98.33% after 50charge-discharge cycling, and the voltage plateau at 1.5V could be seen in thedischarge curves distinctively.

Key words: lithium ion cell, nanorods, lithium titanate, hydrothermal ion exchange

CLC Number:

O646

WU Shi-Chao, GUO Yun-Xia, ZHOU Jian-Hua, ZHAOJian-Qing, DING Xiao-Chun, HE Jian-Ping. Effect ofHeat-treatment Temperature on the Structure and Properties of Li₄Ti₅O₁₂Nanorods Prepared by the Hydrothermal Ion Exchange Method[J]. Journal of Inorganic Materials, 2011, 26(2): 123-128.

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Effect ofHeat-treatment Temperature on the Structure and Properties of Li₄Ti₅O₁₂Nanorods Prepared by the Hydrothermal Ion Exchange Method

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