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Prussian blue derivative Fe-Co-Ni sulfide and preparation method and application thereof

A technology of cobalt-nickel sulfide and Prussian blue, applied in electrical components, battery electrodes, circuits, etc., can solve the problem that the electrochemical performance of materials needs to be improved, and achieve industrialized large-scale application, simple preparation method, and high specific capacity. Effect

Active Publication Date: 2018-05-29
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above studies, the electrochemical performance of the material still needs to be improved.

Method used

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  • Prussian blue derivative Fe-Co-Ni sulfide and preparation method and application thereof
  • Prussian blue derivative Fe-Co-Ni sulfide and preparation method and application thereof
  • Prussian blue derivative Fe-Co-Ni sulfide and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Add potassium ferricyanide, potassium cobalt cyanide, and potassium nickel cyanide with a molar ratio of 1:1:1 into 0.2mol / L hydrochloric acid solution to make potassium ferricyanide, potassium cobalt cyanide, and potassium nickel cyanide The concentrations are respectively 0.1 mol / L; polyvinylpyrrolidone equivalent to 40 times the total mass of potassium ferricyanide, potassium cobalt cyanide, and potassium nickel cyanide is added. The solution was placed in an oven and heated at 80°C for 24 hours. Then centrifuge in a high-speed centrifuge at 10000 rpm to obtain the precipitate, wash it with deionized water and ethanol, and dry to obtain the iron-cobalt-nickel-based cubic structure Prussian blue powder, the structure of which is as figure 1 Shown.

[0033] Mix the iron-cobalt-nickel-based cubic structure Prussian blue powder prepared above with sulfur powder and place it in a tube furnace, and heat it to 600°C at a heating rate of 2°C / min and keep it for 2 hours to obtai...

Embodiment 2

[0035] Add sodium ferricyanide, sodium cobalt cyanide and sodium nickel cyanide with a molar ratio of 1:1:1 into 0.5mol / L hydrochloric acid solution to make the sodium ferricyanide, sodium cobalt cyanide and sodium nickel cyanide The concentrations are respectively 0.1 mol / L; polyvinylpyrrolidone equivalent to 5 times the total mass of sodium ferricyanide, sodium cobalt cyanide and sodium nickel cyanide is added. The solution was placed in an oven and heated at 80°C for 24 hours. Then, the precipitate is obtained by centrifugation in a high-speed centrifuge with a rotation speed of 10,000 rpm, washed with deionized water and ethanol, and dried to obtain iron-cobalt-nickel-based cubic structure Prussian blue powder.

[0036] The iron-cobalt-nickel-based cubic structure Prussian blue powder prepared above is mixed with sulfur powder and placed in a tube furnace, heated to 800°C at a temperature rise rate of 5°C / min, and kept for 2h to obtain the Prussian blue Derived Fe-Co-Ni sulf...

Embodiment 3

[0038] Add potassium ferricyanide, potassium cobalt cyanide, and potassium nickel cyanide with a molar ratio of 5:3:2 to 0.2mol / L hydrochloric acid solution to make potassium ferricyanide, potassium cobalt cyanide, and potassium nickel cyanide The concentrations are respectively 0.5mol / L, 0.3mol / L and 0.2mol / L; polyvinylpyrrolidone equivalent to 40 times the total mass of potassium ferricyanide, potassium cobalt cyanide, and potassium nickel cyanide is added. The solution was placed in an oven and heated at 80°C for 24 hours. Then, the precipitate is obtained by centrifugation in a high-speed centrifuge with a rotation speed of 10,000 rpm, washed with deionized water and ethanol, and dried to obtain iron-cobalt-nickel-based cubic structure Prussian blue powder.

[0039] The iron-cobalt-nickel-based cubic phase Prussian blue powder prepared above is mixed with sulfur powder and placed in a tube furnace, heated to 600°C at a heating rate of 2°C / min, and kept for 2h to obtain the Pr...

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Abstract

The invention discloses a prussian blue derivative Fe-Co-Ni sulfide and preparation method and application thereof. The prussian blue derivative Fe-Co-Ni sulfide is of a three-dimensional porous structure and is obtained by vulcanizing Fe-Co-Ni prussian blue, the frame is fixed by carbon, and the prussian blue derivative Fe-Co-Ni sulfide is prepared by a wet chemical method and by subsequent vulcanization and thermal processing. The prussian blue derivative Fe-Co-Ni sulfide has ultrahigh specific capacity, favorable cycle property and excellent rate performance when used as a sodium / potassiumion battery negative electrode. Compared with other sodium / potassium ion battery negative electrode materials, the material has the advantages that the mass specific capacity of the negative electrodematerial can be effectively improved, and the energy density of all batteries is improved; and meanwhile, the preparation method is simple and practical, and industrial production of the sodium / potassium ion battery negative electrode material is expected to be achieved by corresponding development.

Description

Technical field [0001] The invention relates to the related technical field of negative electrode materials for sodium / potassium ion batteries, in particular to a Prussian blue-derived iron-cobalt-nickel sulfide and a preparation method and application thereof. technical background [0002] With the rapid development of modern society, energy shortages have begun to appear in large numbers. To this end, a large number of new energy sources such as solar energy, wind energy, tidal energy, bioenergy and other new energy sources have been developed in large quantities. However, the supply of these new energy sources is intermittent, so it is necessary to be equipped with efficient, cheap, and safe energy storage systems for energy storage. Due to the characteristics of high energy density, long cycle life, and high safety factor, lithium-ion batteries are considered to be the most suitable solution among many energy storage technologies. However, due to the shortage of lithium res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCH01M4/5815Y02E60/10
Inventor 黎晋良麦文杰谢俊鹏王子龙赵传熙赵志娟
Owner JINAN UNIVERSITY
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