A method and application of in-situ synthesis of three-dimensional graphene-coated cubic sodium manganese ferricyanide

A technology of graphene coating and sodium manganese ferricyanide, which is applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of lattice defect restriction application, poor cycle and rate performance, low electronic conductivity, etc., and achieve cycle And the effects of good rate stability, less uniform coating, and simple preparation process

Active Publication Date: 2021-08-17
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its low electronic conductivity, more lattice defects greatly restrict its application in the cathode material of sodium-ion batteries.
Na reported in the literature 2 MnFe(CN) 6 Most of the particles are irregular in shape and there are many defects such as lattice water, and the cycle and rate performance are poor

Method used

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  • A method and application of in-situ synthesis of three-dimensional graphene-coated cubic sodium manganese ferricyanide
  • A method and application of in-situ synthesis of three-dimensional graphene-coated cubic sodium manganese ferricyanide
  • A method and application of in-situ synthesis of three-dimensional graphene-coated cubic sodium manganese ferricyanide

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Embodiment 1

[0033] In the present embodiment, the preparation method of PVP-assisted in-situ synthesis of three-dimensional graphene-coated cube-shaped sodium manganese ferricyanide is as follows:

[0034] 1. First, graphene oxide is prepared by the improved Hummers method, washed with deionized water until neutral, and then freeze-dried at -50°C to obtain three-dimensional large specific surface area graphene oxide, which is then sealed in an alumina crucible and placed in a 1000 ℃ Reduction in muffle furnace for 1 minute to obtain redox graphene with developed three-dimensional specific surface area;

[0035] 2. Take 0.2g of the three-dimensional large specific surface area redox graphene obtained in step 1, and ultrasonically disperse it in 100ml of ionized water;

[0036] 3. Mix 0.05mol of sodium ferricyanide (Na 4 Fe(CN) 6 ) and 14g sodium chloride were added in the above-mentioned graphene aqueous solution, stirred at room temperature for 2h;

[0037] 4. Mix 0.05mol of manganese ...

Embodiment 2

[0039] In the present embodiment, the preparation method of PVP-assisted in-situ synthesis of three-dimensional graphene-coated cube-shaped sodium manganese ferricyanide is as follows:

[0040] 1. First, graphene oxide is prepared by the improved Hummers method, washed with deionized water until neutral, and then freeze-dried at -50°C to obtain three-dimensional large specific surface area graphene oxide, which is then sealed in an alumina crucible and placed in a 1000 ℃ Reduction in muffle furnace for 1 minute to obtain redox graphene with developed three-dimensional specific surface area;

[0041] 2. Take 0.2g of the three-dimensional large specific surface area redox graphene obtained in step 1, and ultrasonically disperse it in 100ml of ionized water;

[0042] 3. Mix 0.05mol of sodium ferricyanide (Na 4 Fe(CN) 6 ) and 14g sodium chloride were added in the above-mentioned graphene aqueous solution, stirred at room temperature for 2h;

[0043] 4. Mix 0.05mol of manganese ...

Embodiment 3

[0045] In the present embodiment, the preparation method of PVP-assisted in-situ synthesis of three-dimensional graphene-coated cube-shaped sodium manganese ferricyanide is as follows:

[0046] 1. First, graphene oxide is prepared by the improved Hummers method, washed with deionized water until neutral, and then freeze-dried at -50°C to obtain three-dimensional large specific surface area graphene oxide, which is then sealed in an alumina crucible and placed in a 1000 ℃ Reduction in muffle furnace for 1 minute to obtain redox graphene with developed three-dimensional specific surface area;

[0047] 2. Take 0.2g of the three-dimensional large specific surface area redox graphene obtained in step 1, and ultrasonically disperse it in 100ml of ionized water;

[0048] 3. Mix 0.05mol of sodium ferricyanide (Na 4 Fe(CN) 6 ) and 14g sodium chloride were added in the above-mentioned graphene aqueous solution, stirred at room temperature for 2h;

[0049] 4. Mix 0.05mol of manganese ...

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Abstract

The invention discloses a method for in-situ synthesis of three-dimensional graphene-coated cubic block-shaped sodium manganese ferricyanide and its application, wherein the graphene-coated cubic block-shaped sodium manganese ferricyanide is prepared by sodium ferricyanide and dichloro Manganese oxide was obtained by co-precipitation reaction at the active sites on the graphene surface. The three-dimensional graphene-coated cubic sodium manganese ferricyanide obtained by the present invention has less defects such as lattice water, excellent electronic conductance, open sodium ion migration channel and high structural stability, and the sodium ferricyanide obtained by assembling it Ion batteries have high reversible capacity, good cycle and rate stability.

Description

technical field [0001] The invention relates to a method for in-situ synthesis of three-dimensional graphene-coated cubic sodium manganese ferricyanide and its application. Background technique [0002] As an energy storage and conversion device, lithium-ion batteries are currently one of the most important rechargeable batteries, which have the characteristics of high energy density, long cycle life, no memory effect and environmental friendliness. As the demand for lithium-ion batteries becomes more and more urgent, the demand for lithium will increase greatly. However, the reserves of lithium are very limited, and the raw materials are expensive, which makes it difficult to meet the needs of sustainable development in the future. Since sodium is very abundant in the earth's crust, and is in the same family as lithium, it has similar electrochemical properties to lithium, so the development of sodium batteries has become the most important candidate target. [0003] At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/58H01M4/625H01M10/054Y02E60/10
Inventor 蒋阳王辉李丹婷胥恩泽于士梦权俊杰
Owner HEFEI UNIV OF TECH
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