Method for preparing spinel type lithium titanate nanowire array

A nanowire array, spinel-type technology, applied in nanotechnology, electrolytic coatings, surface reaction electrolytic coatings, etc., can solve the problems of long ion migration distance, complex preparation process, low utilization rate, etc., and achieve an orderly degree. High, uniform aperture size, adjustable composition

Inactive Publication Date: 2011-05-04
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the shortcomings of the existing spinel-type lithium titanate, such as low electronic conductivity, long ion migration distance, low utilizatio

Method used

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  • Method for preparing spinel type lithium titanate nanowire array
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  • Method for preparing spinel type lithium titanate nanowire array

Examples

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Embodiment 1

[0017] (1) Preparation of porous alumina template. Degrease an aluminum plate with a size of 2cm×2cm×0.5mm and a purity greater than 99.999% with acetone, then anneal at 500°C for 3 hours, in a perchloric acid + ethanol polishing solution with a volume ratio of 1:4, the temperature is 0°C, Electrochemical polishing was carried out at a voltage of 15V for 5 minutes. After polishing, the aluminum plate was anodized for the first time in an electrolyte solution with a concentration of 0.3mol / L oxalic acid. The reaction was carried out at 0°C for 1 hour, and the anodic oxidation voltage was 55V; then the sample was placed in a In the mixed solution of 0.4mol / L phosphoric acid + 0.2mol / L chromic acid, chemically corrode at 70°C for 30 minutes; after that, use the same anodizing conditions as the first time for 4 hours of secondary anodizing; finally , the aluminum plate was treated with 5wt% phosphoric acid solution for 1 hour at room temperature, washed with ultrapure water and dr...

Embodiment 2

[0022] (1) Preparation of porous alumina template. Degrease an aluminum plate with a size of 2cm×2cm×0.5mm and a purity greater than 99.999% with acetone and anneal at 400°C for 3 hours. Electrochemical polishing was carried out at a voltage of 15V for 5 minutes. After polishing, the aluminum plate was anodized for the first time in an electrolyte solution with a concentration of 0.2mol / L oxalic acid. The reaction was carried out at 10°C for 3 hours, and the anodic oxidation voltage was 60V; then the sample was placed in a In a mixed solution of 0.4mol / L phosphoric acid + 0.2mol / L chromic acid, chemically corrode at 70°C for 30 minutes; then, use the same anodizing conditions as the first time for 5 hours of secondary anodizing; finally , the aluminum plate was treated with 5wt% phosphoric acid solution for 2 hours at room temperature, washed with ultrapure water and dried to obtain a porous alumina template with uniform pore size attached to the pure aluminum plate.

[0023]...

Embodiment 3

[0026] (1) Preparation of porous alumina template. Degrease an aluminum plate with a size of 2cm×2cm×0.5mm and a purity greater than 99.999% with acetone and anneal at 450°C for 3 hours. Electrochemical polishing was carried out at a voltage of 15V for 5 minutes. After polishing, the aluminum plate was anodized for the first time in an electrolyte solution with a concentration of 0.4mol / L oxalic acid. The reaction was carried out at 6°C for 2 hours, and the anodic oxidation voltage was 40V; then the sample was placed in a In the mixed solution of 0.4mol / L phosphoric acid + 0.2mol / L chromic acid, chemically corrode at 70°C for 30 minutes; after that, use the same anodizing conditions as the first time for 6 hours of secondary anodizing; finally , the aluminum plate was treated with 5wt% phosphoric acid solution for 1.5 hours at room temperature, washed with ultrapure water and dried to obtain a porous alumina template with uniform pore size attached to the pure aluminum plate. ...

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Abstract

The invention discloses a method for preparing a spinel type lithium titanate nanowire array, in particular a method for preparing the spinel type lithium titanate nanowire array by using an aluminum oxide template. The method comprises the following steps of: preparing a porous aluminum oxide template; deoiling and annealing an aluminum plate, and performing electrochemical polishing, secondary anodic oxidation and hole expansion; synthesizing a lithium titanate sol precursor; adding butyl titanate, a complexing agent, ethylene glycol and lithium acetate dihydrate into absolute ethanol according to a proportion in turn and continuously stirring; preparing the lithium titanate nanowire array; dipping the porous aluminum oxide template into the lithium titanate sol precursor under vacuum; performing high-temperature roasting; and finally dissolving the template off with NaOH solution. Spinel type lithium titanate nanowires prepared by the method have the diameters of between 50 and 100nm; and the array has the advantages of uniform aperture size, large specific surface area, high degree of order, regular distribution, adjustable composition, controllable structure and the like.

Description

technical field [0001] The invention relates to a method for preparing an electrode material, in particular to a method for preparing a spinel-type lithium titanate nanowire array by using an alumina template. technical background [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, no memory effect, small size, and light weight. and other fields to expand the application space. Carbon materials are widely used in lithium-ion batteries due to their advantages such as low price, high conductivity, high cycle performance, and good chemical stability. However, because the potential of this kind of electrode is close to that of the metal lithium of the anode, it is easy to precipitate metal lithium when the battery is overcharged, causing safety problems, and the resistance of lithium ion insertion and deintercalation is high, and the structural stability is poor, resulting in long charging and discharging time of the battery and low capac...

Claims

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Application Information

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IPC IPC(8): H01M4/139B82Y40/00C25D11/12
CPCY02E60/10
Inventor 刘世斌段东红陈旭池永庆张忠林郝晓刚李一兵
Owner TAIYUAN UNIV OF TECH
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