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Preparation of nano spinelle lithium titanate

A lithium halite titanate and nano-tip technology, which is applied in the field of nanomaterials and new energy materials, can solve the problems of harsh reaction conditions and high energy consumption of the method, and achieve the effects of energy saving, simple reaction steps, and reduced reaction equipment costs

Active Publication Date: 2009-07-22
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spinel lithium titanate prepared by this method has excellent performance, but the method consumes a lot of energy and the reaction conditions are relatively harsh.

Method used

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  • Preparation of nano spinelle lithium titanate
  • Preparation of nano spinelle lithium titanate
  • Preparation of nano spinelle lithium titanate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 3g of reagent grade anatase-type titanium dioxide, slowly add it into a polytetrafluoroethylene container containing 300ml of NaOH solution with a concentration of 10mol / L, control the temperature at 90°C, stir and reflux, react for 48 hours, cool down and filter, and use Neutralize the acid solution to pH = 1, filter and add to 5mol / L lithium hydroxide solution, stir at room temperature for 3 days (or react at 60°C for 10 hours), filter the product and calcinate at 300°C for 24 hours to obtain sharp Crystal lithium titanate.

Embodiment 2

[0037] Get 3g titanium dioxide (Degussa produces P 25 ), adding 300ml of NaOH solution with a concentration of 12mol / L into a polytetrafluoroethylene container, controlling the temperature at 130°C, reflux and stirring for 48 hours, cooling and filtering, washing the product with water to pH=13.5, and adding to 0.5 mol / L lithium acetate solution, stirred for 3 hours, filtered the product and calcined at 1000°C for 2 hours to obtain spinel lithium titanate.

Embodiment 3

[0039] Get 3g titanium dioxide (Degussa produces P 25 ), slowly added to the polytetrafluoroethylene container containing 300ml of NaOH solution with a concentration of 10mol / L, controlled the temperature at 130°C, stirred and refluxed, reacted for 24 hours, cooled and filtered, washed the product with water to pH=13, added after filtration into a 1 mol / L lithium hydroxide solution, stirred for 10 hours, filtered and calcined at 500°C for 6 hours to obtain a spinel lithium titanate product.

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Abstract

The invention pertains to the technical field of nano-materials and new energy materials, more particularly relates to a preparation method of nano spinel lithium titanate; the preparation method comprises the steps that: titanium dioxide, metatitanic acid or titanate reacts with alkali liquor with the concentration of 6 mol / L to15mol / L for 6 hours to 48 hours under normal pressure and the temperature of 90 DEG C to 130 DEG C; then, reaction products are washed with water or acid and mixed with an aqueous solution containing lithium ion for ion exchange lasing for 10 minutes to 3 days under normal pressure; then the mixture is filtered to obtain a filter cake which is calcinated to obtain the spinel lithium titanate. In the invention, all reactions are basically carried out under normal temperature and normal temperature, which not only saves the energy consumption and reduces the cost of reaction equipment, but also simplifies the reaction procedures, creates mild reaction temperature, causes the reaction easy to be controlled and is beneficial to the large-scale industrialization of the preparation method.

Description

(1) Technical field [0001] The invention belongs to the technical field of nanomaterials and new energy materials, and in particular relates to a preparation method of nano spinel lithium titanate. (2) Background technology [0002] With the development of nanotechnology, nanomaterials have incomparable advantages as conventional materials as lithium-ion battery materials, and are more and more widely used in lithium-ion batteries. Nanomaterials have smaller particle size and larger specific surface area, which can increase the diffusion rate of lithium ions in the solid phase of the electrode and improve the charge and discharge performance of lithium ion batteries. Among them, nano-spinel lithium titanate has received extensive attention as an electrode material for lithium-ion batteries in recent years. During the insertion and extraction of lithium ions, the lattice constant of spinel lithium titanate changes very little, which is called "zero". Strain" material with ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00
CPCY02E60/12Y02E60/10
Inventor 张经纬王孝伟张治军
Owner HENAN UNIVERSITY
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