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Preparation method of graphene oxide loaded dopamine coated manganese dioxide nano composite structure electrode material

A manganese dioxide and nanocomposite technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve problems such as poor structural stability and low electrical conductivity, and achieve the effects of low cost, short production cycle and convenient post-processing

Pending Publication Date: 2022-01-11
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to solve the shortcomings of low electrical conductivity and poor structural stability of manganese dioxide positive electrode materials, and provides a preparation method of graphene oxide-loaded dopamine-coated manganese dioxide nanocomposite structure electrode materials

Method used

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  • Preparation method of graphene oxide loaded dopamine coated manganese dioxide nano composite structure electrode material
  • Preparation method of graphene oxide loaded dopamine coated manganese dioxide nano composite structure electrode material
  • Preparation method of graphene oxide loaded dopamine coated manganese dioxide nano composite structure electrode material

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Effect test

Embodiment 1

[0023] A preparation method of a graphene oxide-loaded dopamine-coated manganese dioxide nanocomposite structure electrode material, the steps are:

[0024] (1) Add 0.003mol / L, 270mL manganese sulfate solution into 0.2mol / L, 8mL dilute sulfuric acid aqueous solution, and stir well.

[0025] (2) 0.08mol / L, 60mL potassium permanganate aqueous solution, graphene oxide mass fraction is 1%, dispersant is 20mL deionized water, joins in the manganese sulfate solution respectively; The mixed solution is transferred to polytetrafluoroethylene The reaction was carried out at 140°C for 12 hours in the reactor.

[0026] (3) Place the initial product in a centrifuge, centrifuge at a speed of 8000r / min for 25min, repeatedly wash and centrifuge 3 times with deionized water, then dry the product completely in a freeze dryer to obtain manganese dioxide / oxidized Graphene composite.

[0027] (4) Add 0.08g of manganese dioxide / graphene oxide composite to the 100mL solution of polyethylene oxide...

Embodiment 2

[0030] (1) Add 0.008mol / L, 270mL manganese sulfate solution into 0.3mol / L, 8mL dilute sulfuric acid aqueous solution, and stir well.

[0031] (2) 0.1mol / L, 60mL potassium permanganate aqueous solution, graphene oxide mass fraction is 5%, dispersant is 20mL deionized water, ethanol, dimethylformamide mixture, join in the manganese sulfate solution respectively; The mixture was transferred to a polytetrafluoroethylene reactor and reacted at 160° C. for 9 h.

[0032] (3) Place the initial product in a centrifuge, centrifuge at a speed of 9500r / min for 20min, repeatedly wash and centrifuge 3 times with deionized water, then dry the product completely in a freeze dryer to obtain manganese dioxide / oxidized Graphene composite.

[0033] (4) 0.16g manganese dioxide / graphene oxide composite is added to the 200mL solution of polyethylene oxide-polypropylene oxide-polyethylene oxide with a dissolved mass fraction of 0.8%, and the added quality is 0.08g dopamine, stirred and then vacuum ...

Embodiment 3

[0036] (1) Add 0.01mol / L, 270mL manganese sulfate solution into 0.5mol / L, 8mL dilute sulfuric acid aqueous solution, and stir well.

[0037] (2) 0.2mol / L, 60mL potassium permanganate aqueous solution, graphene oxide mass fraction is 10%, dispersant is 20mL ethanol, dimethylformamide mixture; transfer the mixed solution to the polytetrafluoroethylene reaction kettle React at 180°C for 12h.

[0038] (3) Place the initial product in a centrifuge, centrifuge at a speed of 12000r / min for 10min, repeatedly wash and centrifuge 3 times with deionized water, then dry the product completely in a freeze dryer to obtain manganese dioxide / oxidized Graphene composite.

[0039] (4) 0.32g of manganese dioxide / graphene oxide composite is added to the 300mL solution of polyethylene oxide-polypropylene oxide-polyethylene oxide with a mass fraction of 1.2%, adding a mass of 0.32 g of dopamine, stirred and then vacuum filtered to obtain an intermediate product.

[0040] (5) The intermediate pro...

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Abstract

The invention discloses a preparation method of a graphene oxide loaded dopamine coated manganese dioxide nano composite structure electrode material, and relates to an application of the graphene oxide loaded dopamine coated manganese dioxide nano composite structure electrode material in an aqueous zinc ion battery. The preparation method comprises the following steps: forming a manganese dioxide / graphene oxide compound by a one-step hydrothermal method, and finally, carrying out auto-polymerization on dopamine under an ammonia gas alkaline atmosphere condition to form the graphene oxide loaded dopamine coated manganese dioxide nano composite structure electrode material. The method has the advantages of simple synthesis method, low raw material price, small environmental pollution, easy large-scale production and easy recovery, and has the prospect of serving as the commercial positive electrode material of the aqueous zinc ion battery.

Description

technical field [0001] The invention belongs to the field of new energy materials, and relates to a preparation method and application of a graphene oxide-loaded dopamine-coated manganese dioxide nanocomposite structure electrode material. Background technique [0002] The energy crisis caused by the excessive consumption of fossil fuels and the increasingly severe environmental problems have prompted people to seek and develop cleaner and more efficient energy systems to break through the energy bottlenecks encountered by technological progress. Potential safety issues such as limited lithium resources, high cost, and the use of organic electrolytes restrict the further development of lithium-ion batteries. It is particularly important to seek new energy storage elements that can further replace rechargeable lithium-ion batteries. Rechargeable aqueous zinc-ion batteries (AZIBs) have the advantages of extremely high theoretical specific capacity and low redox potential, and...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/054
CPCH01M4/366H01M4/50H01M4/628H01M4/625H01M10/054Y02E60/10
Inventor 高海燕赵永男孙立文
Owner TIANJIN POLYTECHNIC UNIV
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