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Method for preparing lithium ion battery anode material spherical LiFePO4

A lithium-ion battery, lithium iron phosphate technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of low synthesis cost, poor scale production potential, etc., to improve electrical conductivity, reduce product cost, increase batch sub-reproducible effect

Inactive Publication Date: 2010-06-23
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product is characterized by low synthesis cost and good rate performance; but poor scale production potential

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 10L of xylene to a 30L stirring ball mill, then add 481.7g of iron oxide, 629.9g of lithium dihydrogen phosphate, 9.8g of zirconium oxychloride, and 160g of carbon black in sequence. After stirring the ball mill for 2 hours, the material is spray-dried to obtain a spherical shape and a particle size For uniformly distributed precursors, place the precursors in a high-temperature furnace, raise the temperature to 670°C at 6°C / min under an inert atmosphere, sinter at high temperature for 20 hours, and cool down to obtain spherical lithium iron phosphate powder.

Embodiment 2

[0026] Add 10L of xylene to a 30L stirring ball mill, then add 481.7g of iron oxide, 629.9g of lithium dihydrogen phosphate, 9.8g of zirconium oxychloride, and 160g of carbon black in sequence. After stirring the ball mill for 2 hours, the material is spray-dried to obtain a spherical shape and a particle size For uniformly distributed precursors, place the precursors in a high-temperature furnace, raise the temperature to 650°C at 6°C / min under an inert atmosphere, sinter at high temperature for 20 hours, and cool down to obtain spherical lithium iron phosphate powder.

Embodiment 3

[0028] Add 10L of xylene to a 30L stirring ball mill, then add 481.7g of iron oxide, 629.9g of lithium dihydrogen phosphate, 9.8g of zirconium oxychloride, and 160g of carbon black in sequence. After stirring the ball mill for 2 hours, the material is spray-dried to obtain a spherical shape and a particle size For uniformly distributed precursors, place the precursors in a high-temperature furnace, raise the temperature to 630°C at 6°C / min under an inert atmosphere, sinter at high temperature for 20 hours, and cool down to obtain spherical lithium iron phosphate powder.

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Abstract

The invention relates to a method for preparing lithium ion batter anode material spherical LiFePO4. The method is characterized in that: lithium source, iron source, phosphorous source, doped chemical element compound and carbon precursor are mixed, liquid phase stirring ball milling is carried out in solvent for 1-20h, then spray drying is carried out, thus obtaining spherical precursor with uniform particle size distribution, the precursor is placed into a high temperature furnace and heated to 500-1000DEG C at 1-6 DEG C / min under inert atmosphere, high temperature sintering is carried out for 5-24h, and temperature reduction is carried out, thus obtaining the spherical LiFePO4 powder. Available ferric iron is selected as iron source, thus reducing product cost; regular carbon bed structure is constructed in the interior of the main body of the material and on the surface of the main body of the material, thus improving conductivity of the material; liquid phase ball milling and spray drying are combined, and sintered precursor with small particle size and narrow particle size distribution is obtained, thus improving batch reproducibility of product.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a preparation method of spherical lithium iron phosphate, a cathode material of lithium ion batteries. Background technique [0002] At present, lithium-ion batteries have developed rapidly since they were launched in the early 1990s. At present, the scope of application has expanded from mobile communication power supplies, notebook computers, cameras, etc. to power tools, electric vehicles, etc. The development trend of low cost and environmental friendliness is obvious, all of which benefit from the improvement and innovation of electrode materials. Lithium iron phosphate cathode material has the advantages of abundant raw materials, low cost, no pollution, good safety, obvious charging and discharging platform, moderate capacity, rate charging and discharging characteristics and good cycle stability, etc., and is very suitable as a lithium io...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/12Y02E60/10
Inventor 郭春雨付亚娟高英韩宇郝明明吴滨城刘兴江汪继强
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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