Conductive titanium compound coated lithium iron phosphate positive electrode material and preparation method thereof

A technology of lithium iron phosphate and titanium compound is applied in the field of surface coating modification of lithium iron phosphate by conductive titanium compound, which can solve the problems of inability to obtain electrical conductivity, hindering the diffusion channel of lithium ions, reducing the tap density of active materials, and the like. Achieve the effect of improving the rate performance and cycle performance, which is conducive to miniaturization and increased tap density

Active Publication Date: 2014-10-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when the carbon content is low, a complete and uniform coating layer cannot be formed on the surface of lithium iron phosphate, and sufficient electrical conductivity cannot be

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1

[0018] 5ml of butyl titanate and 46.35g of lithium iron phosphate were added to 100ml of ethanol, stirred and mixed uniformly, then 10ml of deionized water was added, and then continued stirring for half an hour. The obtained mixed solution was spray-dried to obtain a powder with uniform particle size distribution, which was put into a crucible, placed in a muffle furnace with an argon atmosphere, and calcined at 750 ° C for 1 hour, and then cooled with the furnace to obtain titanium dioxide-coated iron phosphate. Lithium powder. The obtained powder and 1.53 g of potassium borohydride were then added to 100 ml of absolute ethanol for ultrasonic dispersion for 30 minutes, and the obtained powder was dried and put into a crucible, calcined in a muffle furnace at 400°C for 15 hours, and cooled with the furnace. The obtained powder was then repeatedly washed with deionized water and ethanol, and finally vacuum dried at 60°C. The lithium iron phosphate powder c...

Example Embodiment

[0019] Example 2

[0020] 5ml of ethyl titanate and 34.55g of lithium iron phosphate were added to 80ml of ethanol, stirred and mixed evenly, then 5ml of deionized water was added, and then continued stirring for half an hour. The obtained mixed solution was spray-dried to obtain powder with uniform particle size distribution, which was put into a crucible, placed in a muffle furnace with an argon atmosphere, and calcined at 700 ° C for 0.5 h, and then cooled with the furnace to obtain a titanium dioxide-coated powder. Lithium Iron Phosphate Powder. The obtained powder and 1.04 g of sodium borohydride were then added to 100 ml of absolute ethanol for ultrasonic dispersion for 30 minutes, and the obtained powder was dried and put into a crucible, calcined in a muffle furnace at 370 ° C for 20 h, and cooled with the furnace. The obtained powder was then repeatedly washed with deionized water and ethanol, and finally dried under vacuum at 100°C. The lithium iron phosphate powde...

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Abstract

The invention relates to a conductive titanium compound coated lithium iron phosphate positive electrode material and a preparation method thereof, and aims at providing excellent electric conductivity and lithium ion conduction property for lithium iron phosphate by adopting a conductive titanium compound as a coating. The material has a core-shell structure, a surface layer is the conductive titanium compound, and a core layer is lithium iron phosphate. The preparation method comprises the steps of (1) adding lithium iron phosphate and a titanium source into anhydrous ethanol, performing hydrolysis and spray drying, roasting the obtained powder under the protection of inert gas and cooling in a furnace; (2) adding the powder obtained in step (1) and a reducer into anhydrous ethanol, performing ultrasonic dispersion, drying, roasting under the protection of inert gas and cooling in the furnace; and (3) taking out the powder in a crucible, washing the powder with anhydrous ethanol and deionized water respectively, and finally, drying in a vacuum furnace to obtain a final product. By adopting the method, the particle size distribution of coated lithium iron phosphate is uniform, the coating has good electric conductivity and does not hinder the conduction of lithium ions, and the electrochemical performance of lithium iron phosphate can be effectively improved.

Description

technical field [0001] The invention relates to the surface coating modification of lithium iron phosphate by using a conductive titanium compound, and belongs to the field of new materials. Background technique [0002] With the development of lithium-ion battery technology, secondary lithium batteries have been widely used in electronic products, electric vehicles, hybrid vehicles, large power grids and new energy storage devices and other fields. Compared with other lithium battery cathode materials, lithium iron phosphate has high safety performance, long cycle life, high specific capacity, good stability, abundant resources, low price, non-toxic and environmental protection, etc., and is widely regarded as the most promising One of the cathode materials for lithium batteries. In addition, lithium iron phosphate has good high-temperature cycle performance and does not explode. Lithium iron phosphate is also an excellent cathode material for large-scale lithium-ion batt...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5825H01M4/624H01M10/0525Y02E60/10
Inventor 毛健徐亚平
Owner SICHUAN UNIV
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