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Nanosheet-shape potassium ion battery cathode material, preparation method thereof and potassium ion battery

A battery cathode and nanosheet technology, which is applied in the field of energy conversion materials, can solve the problems of blocking potassium ion migration, affecting electrochemical performance, affecting rate performance, etc., and achieves the effects of good cycle performance, low equipment requirements, and high production efficiency.

Active Publication Date: 2019-01-29
HEFEI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the electrochemical properties of Prussian blue compounds are greatly affected by the crystallinity of their materials. In the usual preparation process, there is a certain amount of structural water in Prussian blue compounds. The existence of structural water occupies the position of potassium ions on the one hand and affects the battery. Capacity, on the other hand, the presence of structural water blocks the migration of potassium ions in the crystal structure, affecting the rate performance

Method used

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  • Nanosheet-shape potassium ion battery cathode material, preparation method thereof and potassium ion battery
  • Nanosheet-shape potassium ion battery cathode material, preparation method thereof and potassium ion battery
  • Nanosheet-shape potassium ion battery cathode material, preparation method thereof and potassium ion battery

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Embodiment 1

[0033] The molecular formula of the nanosheet-shaped potassium ion battery cathode material of the present embodiment is K 2 Cu[Fe(CN) 6 ], its specific preparation method comprises the steps:

[0034] S1: Dissolve potassium ferrocyanide in a deionized aqueous solution with a concentration of 0.6 mol / L, and place it in an ultrasonic generator with water as the propagation medium;

[0035] S2: Dissolve copper acetate in ethylene glycol solution at 55°C with a concentration of 0.4 mol / L;

[0036] S3: Use a syringe pump to drop the copper acetate alcohol solution into the potassium ferrocyanide aqueous solution at a rate of 2.5 ml / h to carry out the precipitation reaction. At the same time, apply ultrasonic waves with a power of 550 W. The reaction temperature rises, and the medium water in the ultrasonic device is replaced by circulating water, and the reaction temperature is controlled at about 30 °C; the volume ratio of the final reaction copper acetate alcohol solution to p...

Embodiment 2

[0040] The molecular formula of the nanosheet-shaped potassium ion battery cathode material provided in this embodiment is K 2 Cu 0.6 Zn 0.4 [Fe(CN) 6 ], its specific preparation steps are: (

[0041] S1: Dissolve potassium ferrocyanide in a deionized aqueous solution with a concentration of 0.4 mol / L, and place it in an ultrasonic generator with water as the propagation medium;

[0042] S2: Dissolve copper acetate and zinc nitrate in ethylene glycol solution at 55°C, and the total concentration of metal ions is 0.2 mol / L;

[0043] S3: Use a syringe pump to drop the mixed alcohol solution into the potassium ferrocyanide aqueous solution at a rate of 2 ml / h to carry out the precipitation reaction. At the same time, apply ultrasonic waves with a power of 600 W, and to adjust the The reaction temperature rises, and the medium water in the ultrasonic device is replaced by circulating water, and the reaction temperature is controlled at about 30 °C; the volume ratio of the fina...

Embodiment 3

[0048] The molecular formula of the nanosheet-shaped potassium ion battery cathode material provided in this embodiment is K 2 Zn[Fe(CN) 6 ], its concrete preparation steps are as follows:

[0049] S1: Dissolve potassium ferrocyanide in a deionized aqueous solution with a concentration of 0.5 mol / L, and place it in an ultrasonic generator, using water as the propagation medium;

[0050] S2: Dissolve zinc nitrate in ethylene glycol solution at 55°C, and the total concentration of metal ions is 0.25 mol / L;

[0051] S3: Use a syringe pump to drop the mixed alcohol solution into the potassium ferrocyanide aqueous solution at a rate of 2.5 ml / h to carry out the precipitation reaction. At the same time, apply ultrasonic waves with a power of 750 W. When the reaction temperature rises, use circulating water to replace the medium water in the ultrasonic device, and control the reaction temperature to about 30 °C; the volume ratio of the final reaction copper acetate alcohol solution...

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Abstract

The invention discloses a nanosheet-shape potassium ion battery cathode material, a preparation method thereof and a potassium ion battery. The molecular formula of the nanosheet potassium ion batterycathode material is K2CuxZn1-x[Fe(CN)6], wherein x satisfies the relation of 0<=x<=1. The preparation method of the nano-platelet potassium ion battery cathode material comprises the following steps:dissolving potassium ferrocyanide in a deionized water solution to obtain a solution A; dissolving soluble copper salt and soluble zinc salt in an alcohol solution, and conducting heating while stirring to obtain a solution B; dropwise adding the solution B to the solution A, and performing a precipitation reaction under ultrasonic assistance to obtain a precipitated product; and washing and drying the precipitated product to obtain the nano-platelet potassium ion battery positive electrode material. The preparation method is simple, and short in cycle; the prepared material can be used without other treatment processes; the prepared K2CuxZn1-x[Fe(CN)6] has good crystallinity; and the nanosheet shape effectively shortens the potassium ion transport path, so that the assembled potassium-ion batteries have high first-time coulombic efficiency and long cycle life.

Description

technical field [0001] The invention relates to a nanosheet potassium ion battery cathode material, a preparation method thereof and a potassium ion battery, belonging to the technical field of energy conversion materials. Background technique [0002] At present, with the massive consumption of non-renewable energy such as coal and oil, the resulting energy crisis and environmental problems force people to continuously explore new energy sources. Clean and renewable energy sources such as wind energy, solar energy, and tidal energy have become important for sustainable energy development. substitute. However, the intermittent and random characteristics of renewable energy itself make its energy supply fluctuate greatly, which needs to be matched with efficient energy storage technology to achieve energy storage and stable output, and has the advantages of high efficiency and stability. Electrochemical energy storage is currently the most ideal energy storage technology. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/12C01C3/08H01M4/58H01M10/054B82Y30/00
CPCH01M4/58H01M10/054B82Y30/00C01C3/08C01C3/12C01P2006/40C01P2004/03C01P2002/72C01P2004/04Y02E60/10
Inventor 马小航訾振发吴耀东王姣贾伟
Owner HEFEI NORMAL UNIV
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