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A kind of preparation method of carbon gel coated lithium iron phosphate cathode material

A technology for coating lithium iron phosphate and positive electrode materials with carbon gel, which is applied to battery electrodes, structural parts, electrical components, etc., can solve the problems of slow electrode ion diffusion, low tap density, and good low-temperature performance, and achieves the preparation steps. Simple, low temperature performance, high conductivity effect

Inactive Publication Date: 2018-12-18
周志才
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation steps of the present invention are simple, the obtained product has high electrical conductivity and good low-temperature performance, and the lithium iron phosphate positive electrode material is prepared by fully utilizing the carbon gel coating, which effectively solves the problems of low material tap density and slow diffusion of electrode ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] First weigh 4g of graphite powder and put it into a three-necked flask, put the flask into an ice bath at 0°C, slowly add 200mL of mixed acid dropwise to the flask while stirring, and control the dropping rate to 5mL / min. Then add 20g of potassium permanganate, stir and mix for 20min, then move the flask into a water bath, stir and react at 55°C for 12h, then raise the temperature of the water bath to 98°C after the reaction, keep stirring and react for 10min; the mixed acid It is formed by mixing 98% sulfuric acid with mass fraction 80% phosphoric acid in a volume ratio of 10:1; after the above reaction is completed, take out the flask from the water bath, and add 6mL of 30% hydrogen peroxide in the flask, and stir until no Air bubbles are generated, filter to obtain filter residue, respectively use 5% hydrochloric acid and deionized water to ultrasonically clean it for 5 minutes, then centrifuge to obtain a precipitate, freeze-dry, grind, and pass through a 100-mesh si...

example 2

[0020] First weigh 5g of graphite powder and put it into a three-necked flask, put the flask into an ice bath at 3°C, slowly add 250mL of mixed acid dropwise to the flask while stirring, and control the dropping rate to 8mL / min. Then add 25g of potassium permanganate, stir and mix for 25min, then move the flask into a water bath, stir and react at 58°C for 15h, then raise the temperature of the water bath to 98°C after the reaction, keep stirring and react for 13min; the mixed acid It is formed by mixing 98% sulfuric acid with mass fraction 80% phosphoric acid in a volume ratio of 10:1; after the above reaction is completed, take out the flask from the water bath, and add 7mL of 30% hydrogen peroxide in the flask, and stir until no Air bubbles are produced, and the filter residue is obtained by filtration, which is ultrasonically cleaned for 8 minutes with 5% hydrochloric acid and deionized water respectively, and then centrifuged to obtain a precipitate, which is ground after ...

example 3

[0023] First, weigh 6g of graphite powder and put it into a three-necked flask, put the flask into an ice bath at 5°C, slowly add 300mL of mixed acid dropwise to the flask while stirring, and control the dropping rate to 10mL / min. Then add 30g of potassium permanganate, stir and mix for 30min, then move the flask into a water bath, stir and react at 60°C for 18h, then increase the temperature of the water bath to 98°C after the reaction, keep stirring and react for 15min; the mixed acid It is formed by mixing 98% sulfuric acid with a mass fraction of 80% phosphoric acid in a volume ratio of 10:1; after the above reaction is completed, take out the flask from the water bath, and add 8mL of 30% hydrogen peroxide in the flask, and stir until no Bubbles are generated, filter to obtain filter residue, respectively use 5% hydrochloric acid and deionized water to ultrasonically clean it for 10 minutes, then centrifuge to obtain a precipitate, freeze-dry, grind, and pass through a 120-...

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Abstract

The invention discloses a preparation method of a carbon gel-coated lithium iron phosphate positive electrode material, and belongs to the technical field of preparation of lithium iron phosphate positive electrode materials. The method comprises the steps of preparing a graphite oxide from graphite, reducing the graphite oxide to obtain graphene and dispersing the graphene into distilled water to obtain a graphene dispersion liquid; and adding the graphene dispersion liquid, resorcinol and formaldehyde to a reaction kettle for ageing to obtain graphene-doped carbon gel, adding a dissolved solution of a lithium iron phosphate material to the reaction kettle, reacting under nitrogen protection to obtain a reactant and burning the reactant at different temperatures separately to obtain the carbon gel-coated lithium iron phosphate positive electrode material. The preparation method has the beneficial effects that the obtained product is high in electrical conductivity and good in low-temperature performance and the specific capacity reaches over 205mAh / g; the problems of relatively low tap density and slow ion diffusion of an electrode are solved by using the carbon gel-coated lithium iron phosphate positive electrode material; the tap density reaches 1.8-2.3g / mL; and the diffusion coefficient of ions of the electrode is greater than 1.6*10<-12>cm<2> / s.

Description

technical field [0001] The invention relates to a preparation method of a carbon gel-coated lithium iron phosphate positive electrode material, and belongs to the technical field of preparation of lithium iron phosphate positive electrode materials. Background technique [0002] In recent years, with the shortage of resources and the increasingly prominent problems of environmental pollution, new energy, especially energy storage devices represented by lithium-ion batteries, have developed rapidly, and have continuously replaced nickel-cadmium and nickel-cadmium in the fields of electric vehicles, medical equipment, and communication equipment. Hydrogen and other conventional storage batteries. Because of its many advantages, lithium iron phosphate is considered to be the first choice to replace lithium cobaltate as the cathode material for the next generation of lithium-ion batteries. However, lithium iron phosphate itself has disadvantages such as complex preparation proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5825H01M4/621H01M4/623Y02E60/10
Inventor 张国华盛海丰王统军
Owner 周志才