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Development of Lithium Titanate as the Negative Materials for Lithium Ion Batteries

Author: ZhaoSongHe
Tutor: TangZhiYuan
School: Tianjin University
Course: Applied Chemistry
Keywords: Lithium-ion battery Negative material Lithium titanate Doping
CLC: TM912
Type: Master's thesis
Year: 2008
Downloads: 906
Quote: 6
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Abstract


Lithium Titanate was synthesized by solid-state reaction and sol-gel method, respectively. The materials were investigated by constant current charge-discharge test, AC impedance, Cycle Voltammagram （CV） and characterized by X-ray Diffraction （XRD）, Scan electron microscope （SEM）, Thermogravimetry-differential thermoanalysis （TG-DTA）.The infection of the synthesis conditions of Li4Ti5O12 prepared by solid-state reaction were investigated, CV and AC impedance were used to evaluate the product. The results demonstrated that the materials of best performance were prepared with Li2CO3 and anatase TiO2 as starting materials sintered at 900℃for 16h. There is not passivation film on the surface of Li4Ti5O12 indicated that Li4Ti5O12 was safer than carbon as Li-ion battery negative material.Solid-state reaction was used to gain ion-doped Li4Ti5O12. The results showed that the ions of Ag+、V5+、Sn4+、Mo6+、Ge4+、Nb5+ were doped availably. The materials doped by Ag+、Sn4+、Mo6+、Ge4+ got best performance with different doping content: 0.2 Ag+ with 140.89mAh/g discharge capacity after 20cycles at 0.2C, 0.1 Sn4+ with 157.10mAh/g discharge capacity after 20cycles at 0.1C, 0.2 Mo6+ with 145.86 mAh/g discharge capacity after 20cycles at 0.2C, 0.1 Ge4+ with174.38mAh/g first discharge capacity 156.86mAh/g discharge capacity after 20 cycles at 0.1C.Li4Ti5O12 was synthesized by sol-gel method, different operation ans sintered time were investigated to get the ideal experimental flow. The results showed that the materials sintered at 900℃for 20h got the capacity of 120mAh/g and better high charge-discharge efficiency. Mo6+、Nb5+、Ge4+ could also be doped by sol-gel method, the material doped with 0.5 Mo6+ was better than other doped. The cyclic stability of doped Li4Ti5O12 was improved than pure Li4Ti5O12.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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