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Carbon-coated doping modified lithium titanate and preparation method thereof

A kind of lithium titanate and carbon coating technology, applied in the field of electrochemical power source material preparation, can solve the problems of unsatisfactory high rate performance, difficult to control particle size, poor electronic conductivity, etc., to improve intrinsic electronic conductivity, Effect of reduced electrode polarization and high rate performance

Active Publication Date: 2014-11-12
HUI ZHOU BTR NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Another object of the present invention is to provide a method for preparing carbon-coated doped modified lithium titanate as the negative electrode material of lithium-ion batteries, so as to overcome the defects of the prior art, that is, the particle size of traditional solid-phase reaction products is difficult to control, and the electronic conductivity Poor rate, unsatisfactory high rate performance, high cost, etc.

Method used

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  • Carbon-coated doping modified lithium titanate and preparation method thereof
  • Carbon-coated doping modified lithium titanate and preparation method thereof
  • Carbon-coated doping modified lithium titanate and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] Ultrasonic dispersion of micron-sized anatase titanium dioxide, sucrose and nano-sized iron powder in absolute ethanol at a mass ratio of 15:5:2 and magnetically stirred for 0.5 hours to obtain a suspension, which was dried at 80°C for 2 hours to obtain a paste Using argon as a protective atmosphere, heat-treat the paste at 500°C for 2 hours to obtain carbon-coated titanium dioxide, then soak carbon-coated titanium dioxide with 5mol / L sulfuric acid for 1 hour, wash, dry and grind to obtain coated titanium dioxide. The coating has carbon-coated titanium dioxide with tiny pores; then weigh lithium hydroxide, carbon-coated titanium dioxide, magnesium carbonate and aluminum oxide according to the atomic molar ratio of lithium, titanium, magnesium and aluminum 3.74:4.8:0.3:0.2, and the above The mixture was fully mixed for 16 hours, then calcined under a nitrogen atmosphere, kept at 600°C for 6 hours, and then kept at 800°C for 4 hours; cooled to room temperature with the fur...

Embodiment 2

[0028] Nanoscale anatase titanium dioxide, starch and nanoscale aluminum powder are ultrasonically dispersed in absolute ethanol in a mass ratio of 20:5:4, and magnetically stirred for 2 hours to obtain a suspension, which is dried at 80°C for 2 hours to obtain The paste, using argon as a protective atmosphere, heat-treated the paste at 550°C for 3 hours to obtain carbon-coated titanium dioxide, then soaked carbon-coated titanium dioxide in 5mol / L hydrochloric acid for 0.5 hours, washed, dried and ground The cladding layer has carbon-coated titanium dioxide with tiny pores; then lithium carbonate, carbon-coated titanium dioxide, magnesium carbonate and aluminum hydroxide are weighed according to the atomic molar ratio of lithium, titanium, magnesium and aluminum 3.94:4.85:0.1:0.15, and The above mixture was fully mixed for 24 hours, then calcined under an argon atmosphere, kept at 600°C for 8 hours, and then kept at 850°C for 2 hours; cooled to room temperature with the furnace...

Embodiment 3

[0030] Ultrasonic dispersion of micron-sized anatase titanium dioxide, glucose and micron-sized iron powder in absolute ethanol in a mass ratio of 20:10:4, and magnetic stirring for 3 hours to obtain a suspension, which was dried at 80°C for 2 hours to obtain The paste, using nitrogen as a protective atmosphere, heat-treated the paste at 600°C for 1 hour to obtain carbon-coated titanium dioxide, then soaked carbon-coated titanium dioxide in 5mol / L sulfuric acid for 3 hours, washed, dried and ground to obtain coated titanium dioxide. The coating has carbon-coated titanium dioxide with tiny pores; then, lithium hydroxide, carbon-coated titanium dioxide, magnesium acetate and aluminum oxide are weighed according to the atomic molar ratio of lithium, titanium, magnesium and aluminum 3.99:4.98:0.05:0.02, and the above The mixture was fully mixed for 18 hours, then calcined under a nitrogen atmosphere, kept at 650°C for 12 hours, and then kept at 800°C for 6 hours; cooled to room tem...

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Abstract

The invention discloses carbon-coated doping modified lithium titanate and a preparation method thereof. The carbon-coated doping modified lithium titanate is characterized in that carbon-coated doping modified lithium titanate has a general formula of Li[4-x]MgxTi[5-y]AlyO12 / C, wherein x is not less than 0.05 and not greater than 0.5, and y is not less than 0.02 and not greater than 0.25. The preparation method sequentially comprises the following steps of: dispersing titanium dioxide, soluble sugar and aluminium powder or iron powder in absolute ethyl alcohol, stirring to obtain a suspension, drying to obtain a paste, performing heat treatment to obtain carbon-coated titanium dioxide, soaking with hydrochloric acid or sulphuric acid, and preparing carbon-coated titanium dioxide with micro pores on a coating layer via washing, drying and grinding; weighing a lithium source, carbon-coated titanium dioxide, a magnesium source and an aluminium source, and mixing; calcining the mixed materials, and preserving heat; and grinding and sieving to obtain the carbon-coated doping modified lithium titanate. The carbon-coated doping modified lithium titanate and the preparation method thereof disclosed by the invention have the greatest advantage that the conductivity of the material is remarkably improved and a high discharge specific capacity and an excellent cycling stability are shown under a high rate. The method is simple in process, low in raw material price and available in raw materials, and easily realizes industrialized production. The carbon-coated doping modified lithium titanate and the preparation method thereof have a wide application prospect in the fields of negative materials for small, power and energy-storing lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical power source materials, in particular to lithium titanate, a lithium ion battery negative electrode material, and a preparation method thereof. Background technique [0002] With the increasing shortage of global oil resources and the continuous pollution of the atmospheric environment, at present, hybrid electric vehicles (HEV) and pure electric vehicles (EV) have received special attention and attention, while high-power and safe power systems are restricting electric vehicles An important factor in the development of automobiles. At present, lithium-ion batteries have become one of the main power sources of electric vehicles due to their high energy density, high working voltage, and environmental protection. As a power lithium-ion battery, it requires battery electrode materials to have the characteristics of high power, long life, high safety, low cost, and environment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/62H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 肖方明肖志平唐仁衡王英李伟孙秦
Owner HUI ZHOU BTR NEW MATERIAL TECH
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