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A preparation method of graphene interspersed with manganese-based layered structure lithium battery positive electrode material

A positive electrode material, lithium battery technology, applied in the direction of battery electrodes, structural parts, secondary batteries, etc., can solve the problems of low tap density, poor low temperature performance and conductivity, etc., achieve good low temperature performance and conductivity, short cycle, The effect of low energy consumption

Active Publication Date: 2018-11-23
北京中能德源能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: Aiming at the disadvantages of poor low-temperature performance and conductivity and low tap density of the current lithium battery positive electrode material, a kind of graphite powder is mixed with concentrated sulfuric acid, etc., and the pre-oxidized graphite powder is obtained by suction filtration , and then reacted with concentrated sulfuric acid solution, hydrogen peroxide solution, hydrochloric acid, etc., centrifuged to obtain a precipitate, dried and mixed with calcined manganese dioxide, lithium hydroxide monohydrate, sodium sulfide, etc. to obtain a ball mill, and added deionized water Carrying out hydrothermal reaction, washing and drying the reactants to prepare graphene-interspersed manganese-based layered structure lithium battery cathode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] First, measure 33 mL of sulfuric acid solution with a mass fraction of 98%, add 5.0 g of graphite powder, 6.2 g of potassium persulfate, and 6.2 g of phosphorus pentoxide in a constant temperature water bath at 75°C, and stir at 200 r / min for 4 hours to obtain a mixed solution. Add the mixed solution to 2L of deionized water, and filter it with a 200nm pore size ultrafiltration membrane to obtain a filter cake. After washing the filter cake with deionized water for 3 times, the filter cake is naturally air-dried to obtain pre-oxidized graphite powder; Take 30mL of sulfuric acid solution with a mass fraction of 98%, add 5g of the above-mentioned pre-oxidized graphite powder and 3g of potassium permanganate to the sulfuric acid solution under an ice-water bath, stir at 100r / min for 15min, then heat to 35°C, and continue stirring for 2h Finally, add the stirred mixture into 60mL deionized water, stir for 2 hours, cool to room temperature, add 180mL deionized water, stir eve...

example 2

[0018]First, measure 34 mL of sulfuric acid solution with a mass fraction of 98%, add 5.5 g of graphite powder, 6.6 g of potassium persulfate, and 6.6 g of phosphorus pentoxide in a constant temperature water bath at 78 ° C, and stir at 250 r / min for 5 h to obtain a mixed solution. Add the mixed solution to 3L of deionized water, and filter it with a 250nm pore size ultrafiltration membrane to obtain a filter cake. After washing the filter cake with deionized water for 4 times, the filter cake is naturally air-dried to obtain pre-oxidized graphite powder; Take 35mL of sulfuric acid solution with a mass fraction of 98%, add 6g of the above pre-oxidized graphite powder and 4g of potassium permanganate to the sulfuric acid solution under an ice-water bath, stir at 150r / min for 18min, then heat to 38°C, and continue stirring for 3h Finally, add the stirred mixture into 65mL deionized water, stir for 3h, cool to room temperature, add 190mL deionized water, stir evenly, then add 6mL ...

example 3

[0021] First, measure 35 mL of sulfuric acid solution with a mass fraction of 98%, add 6.0 g of graphite powder, 7.0 g of potassium persulfate, and 7.0 g of phosphorus pentoxide in a constant temperature water bath at 80°C, and stir at 300 r / min for 5 hours to obtain a mixed solution. The mixed solution was added to 3L deionized water, and it was suction-filtered with a 300nm pore size ultrafiltration membrane to obtain a filter cake. After washing the filter cake 5 times with deionized water, the filter cake was naturally air-dried to obtain pre-oxidized graphite powder; Take 40mL of sulfuric acid solution with a mass fraction of 98%, add 6g of the above pre-oxidized graphite powder and 4g of potassium permanganate to the sulfuric acid solution under an ice-water bath, stir at 200r / min for 20min, then heat to 40°C, and continue stirring for 3h Finally, add the stirred mixture into 70mL deionized water, stir for 3 hours, cool to room temperature, add 200mL deionized water, stir...

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Abstract

The invention discloses a preparation method of a graphene interpenetrating manganese-based lamellar lithium battery positive electrode material and belongs to the technical field of lithium battery positive electrode material preparation. The preparation method comprises mixing graphite powder and concentrated sulfuric acid, carrying out pumping filtration to obtain pre-oxidized graphite powder, carrying out a stirring reaction process on the pre-oxidized graphite powder, a concentrated sulfuric acid solution, a hydrogen peroxide solution and hydrochloric acid, carrying out centrifugation on the product to obtain precipitates, drying the precipitates, carrying out mixing ball milling on the precipitates, calcined manganese dioxide, lithium hydroxide monohydrate and sodium sulfide, adding deionized water into the mixed powder for a hydro-thermal reaction, and washing and drying the reaction products to obtain the graphene interpenetrating manganese-based lamellar lithium battery positive electrode material. The preparation method has simple processes, low energy consumption and a short period. The product has good low temperature performances and good conductivity and has tap density of 1.9-2.5g / mL.

Description

technical field [0001] The invention relates to a preparation method of a lithium battery positive electrode material with graphene interspersed with a manganese-based layer structure, and belongs to the technical field of lithium battery positive electrode material preparation. Background technique [0002] Human beings use various electric appliances in daily life, such as electric vehicles and portable electronic products, all of which need to use chemical power sources. Among the chemical power sources used, lithium-ion batteries have been widely used due to their high working voltage, light weight, small size, high specific energy, no memory effect, small self-discharge, and long cycle life. They have been used in portable electronic products Widely used, and gradually extended to electric tools and electric vehicles. The performance of lithium-ion batteries mainly depends on the performance of its cathode material. LiCo0 2 (Lithium cobalt oxide) is the first generat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 郭迎庆盛海丰王龙
Owner 北京中能德源能源科技有限公司
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