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A kind of preparation method of lithium iron phosphate/graphene oxide/platinum composite electrode material

A lithium iron phosphate and composite electrode technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of difficult control of the operation process, complicated preparation process, general rate performance, etc., and achieve low cost, simple operation process and process, The effect of less electrochemical side reactions

Inactive Publication Date: 2018-08-14
董忠贵
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problems mainly solved by the present invention: the preparation process of lithium iron phosphate composite material is complex, the reaction temperature is high, the reaction time is long, the operation process is not easy to control, and although the cycle performance of carbon-coated modified lithium iron phosphate is improved, its rate performance is average. To solve the problem, a preparation method of lithium iron phosphate / graphene oxide / platinum composite electrode material is provided. In the present invention, graphene oxide is first dispersed in a mixed acid of concentrated sulfuric acid and concentrated sulfuric acid for treatment, and the treated graphite oxide Disperse olefin into platinum chloride, and irradiate with ultraviolet light, and then disperse the separated filter residue into deionized water, irradiate with ultraviolet light and dry to obtain graphene oxide-loaded platinum particles, and then prepare lithium iron phosphate particles by hydrothermal method. Dispersing it in water, adding graphene oxide-supported platinum particles into the dispersion liquid, stirring and mixing, drying, and subjecting the dry matter to high temperature treatment, the composite material can be obtained. The reaction conditions of the present invention are mild, the operation process and process are simple, and the conductive compound The formation of the layer can significantly improve the rate performance, and the prepared composite material can significantly improve the battery capacity rate performance, high voltage performance, high product purity, and low cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Add 3g graphene oxide, 10mL mass fraction 98% sulfuric acid solution and 30mL mass fraction 60% nitric acid solution to a 250mL three-necked flask in turn, put them in a water bath, stir at 50°C for 5h, centrifuge after stirring, and obtain the processed Graphene oxide; the graphene oxide after the above treatment is added into the platinum chloride solution with a concentration of 1 μmol / L according to the solid-to-liquid ratio of 1:100, ultrasonically dispersed for 10 minutes, placed under a UV lamp for 20 minutes, and filtered to obtain a filter residue , and then add the filter residue to deionized water according to the solid-liquid ratio of 1:50, and after ultrasonic dispersion for 10 minutes, irradiate the dispersion liquid under the ultraviolet lamp for 60 minutes, and filter the filter residue after irradiation, put it in an oven, and dry it at 60°C 8h, you can get graphene oxide-loaded platinum particles, set aside; measure 100mL polyethylene glycol in a 500mL ...

example 2

[0019]Add 3.5g of graphene oxide, 13mL of 98% sulfuric acid solution and 40mL of 60% nitric acid solution to a 250mL three-necked flask, put them in a water bath, stir at 55°C for 5.5h, and centrifuge after stirring to obtain Treated graphene oxide; add the above-mentioned treated graphene oxide into the platinum chloride solution with a concentration of 2 μmol / L according to the solid-to-liquid ratio of 1:100, ultrasonically disperse for 13 minutes, put it under a UV lamp for 23 minutes, and filter after irradiation To obtain the filter residue, then add the filter residue to deionized water at a solid-to-liquid ratio of 1:50, ultrasonically disperse for 13 minutes, irradiate the dispersion under a UV lamp for 65 minutes, and suction filter to obtain the filter residue after irradiation, and put it in an oven at 65°C Dry at temperature for 9 hours to obtain graphene oxide-loaded platinum particles for later use; measure 110mL of polyethylene glycol in a 500mL beaker, add 33mL ...

example 3

[0022] Add 4g of graphene oxide, 15mL of 98% sulfuric acid solution and 45mL of 60% nitric acid solution to a 250mL three-neck flask, put them in a water bath, stir at 60°C for 6h, centrifuge after stirring, and obtain the processed Graphene oxide; the graphene oxide after the above treatment is added to a concentration of 3 μmol / L platinum chloride solution according to the solid-to-liquid ratio of 1:100, ultrasonically dispersed for 15 minutes, put into an ultraviolet lamp for 25 minutes, and filtered to obtain a filter residue , and then add the filter residue to deionized water according to the solid-liquid ratio of 1:50, after ultrasonic dispersion for 15 minutes, irradiate the dispersion liquid under the ultraviolet lamp for 70 minutes, and filter the filter residue after irradiation, put it in an oven, and dry it at 70°C 10h, you can get graphene oxide supported platinum particles, set aside; measure 120mL of polyethylene glycol in a 500mL beaker, add 35mL of 15% phospho...

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Abstract

The invention discloses a preparation method of a lithium iron phosphate / graphene oxide / platinum composite electrode material and belongs to the field of electrode materials. Graphene oxide is firstly dispersed in the mixed acid of concentrated sulfuric acids for treatment, the treated graphene oxide is dispersed in platinum chloride and is irradiated by using an ultraviolet lamp, filter residues obtained through separation is dispersed in deionized water, is irradiated by using the ultraviolet lamp and then is dried to obtain graphene oxide supported platinum particles, a hydrothermal method is utilized to prepare lithium iron phosphate particles, then the lithium iron phosphate particles are dispersed in water, the graphene oxide supported platinum particles are added to dispersion liquid, stirring, mixing and drying are performed, the dried product is subjected to high-temperature treatment, and then the composite material is obtained. The reaction conditions are mild, the operating process and a process are simple, a generated conductive composite layer can obviously improve the rate capability, the prepared composite material can obviously improve the rate capability of batteries, the high voltage performance is good, the product purity is high, and the cost is lower.

Description

technical field [0001] The invention discloses a lithium iron phosphate / graphene oxide / platinum composite electrode material prepared by a method, and belongs to the field of electrode materials. Background technique [0002] With the advancement of science and technology, lithium-ion batteries are gradually being used in large-capacity battery fields such as power and energy storage. Phosphate-based positive electrode materials (lithium iron phosphate) have the advantages of high specific capacity, low price, abundant raw material sources, environmental friendliness, and good safety performance. As the preferred material for large-capacity power battery applications, it has attracted much attention. Vehicles, power grid peak regulation, energy storage facilities for wind and solar power generation, emergency power reserves, and auxiliary power supplies for vehicles. Especially in recent years, with the in-depth research on improving its rate performance, the electrochemica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/364H01M10/0525Y02E60/10
Inventor 张静王统军
Owner 董忠贵
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