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Method for preparing potassium ion battery electrode potassium type birnessite

A technology of birnessite and battery materials, applied in battery electrodes, circuits, electrical components, etc.

Active Publication Date: 2018-09-07
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on the method of increasing the potassium content in the electrode material of the potassium ion battery by the ion exchange method is seldom reported.

Method used

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  • Method for preparing potassium ion battery electrode potassium type birnessite
  • Method for preparing potassium ion battery electrode potassium type birnessite
  • Method for preparing potassium ion battery electrode potassium type birnessite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 4.83g K 2 CO 3 and 8.70g MnO 2 , milled with a ball mill for 15 hours, mixed uniformly to obtain a powder precursor, and then in a high-temperature furnace, under an air atmosphere, at 5°C min -1 The heating rate was increased to the preset temperature of 850°C, kept for 15 hours, cooled to room temperature naturally, the obtained product was washed with deionized water, and dried at 70°C to obtain the potassium birnessite material. X-ray diffraction (XRD) refinement (Fullprof) figure is shown in figure 1 , SEM photographs are shown in image 3 a, The sample exhibits a lamellar morphology, with a particle size of about 30 μm, a sheet thickness of about 15 μm, and a potassium stoichiometric ratio of 0.21. Potassium-type birnessite electrode material in 0.8mol L -1 LiPF 6 (Solvent: propylene carbonate) as the electrolyte, at 80mA·g -1 After 50 cycles at a certain current density, the mass specific capacity remained at 53mAh g -1 , The capacity retention rate...

Embodiment 2

[0031] The operation is the same as in Example 1, and the potassium-type birnessite material is prepared, and 4.50g of potassium-type birnessite is weighed and transferred to 3mol L -1 Heat and reflux at 130°C in potassium hydroxide solution for 5 hours, and the obtained product is filtered and washed repeatedly with deionized water until it becomes neutral, and the product filter cake is moved into a drying oven at 70°C for 12 hours to obtain a high-potassium sodium water solution based on aqueous solution exchange. manganese ore material. XRD pattern shown in figure 2 , SEM photographs are shown in image 3 b, The sample presents a lamellar morphology, with a particle size of ~20 μm, a sheet thickness of ~15 μm, and a potassium stoichiometric ratio of 0.31. The galvanostatic charge-discharge curves of the high-potassium birnessite electrode material exchanged by aqueous solution at different current densities are shown in Figure 4 , with 0.8mol L -1 LiPF 6 (Solvent: p...

Embodiment 3

[0033] The operation was the same as that in Example 1, and the potassium-type birnessite material was prepared. Weighed 4.12g of potassium-type birnessite and mixed with 11.20g of potassium hydroxide solid, transferred to a high-temperature furnace for high-temperature sintering at 800°C for 15 hours, and naturally cooled to room temperature. The obtained product After repeated suction filtration and washing with deionized water until neutral, the product filter cake was moved into a drying oven at 70°C for 12 hours to obtain a high-potassium birnessite material based on high-temperature exchange. XRD pattern shown in figure 2 , SEM photographs are shown in image 3 c, Part of the sample retains a lamellar morphology, while there are a large number of finely divided particles, and the stoichiometric ratio of potassium reaches 0.28. High-potassium birnessite electrode material exchanged at high temperature in 1mol L - 1 LiPF 6 (Solvent: propylene carbonate) as the electro...

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Abstract

The invention discloses a method for preparing a potassium type birnessite manganese ore layered crystal potassium ion battery electrode material from a potassium salt and tetravalence manganite witha high-temperature solid-phase method together with an ion exchange method process. Due to adoption of the ion exchange process, the content of potassium ions in potassium type birnessite manganese ore can be increased, and properties of a potassium ion battery electrode are improved. The high-potassium type birnessite electrode material of water solution exchange is high in electric property, thecurrent density of the material is 16mA*g<-1>, the mass specific capacity of the material is up to 125mAh*g<-1>, and when the current density of the material is increased to 400mA*g<-1>, the mass specific capacity of the material is still maintained at 68mAh*g<-1>. After 50 times of circulation at a current density of 80mA*g<-1>, the mass specific capacity of the material is still maintained at 68mAh*g<-1>, and the capacity retention rate of the material is 79%. When being used as a potassium ion battery electrode material, a sample prepared with the method is excellent in rate capability andcirculation stability.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy storage materials, and in particular relates to a preparation method and application of potassium-type birnessite, an electrode material of a potassium ion battery. Background technique [0002] Due to the massive consumption of limited fossil resources, global warming and environmental pollution are intensified. It is expected that rechargeable batteries, fuel cells and supercapacitors will achieve scientific development and technological breakthroughs to meet the needs of low-carbon and sustainable economic development. Lithium-ion batteries have been widely used in the power plant of electric vehicles, wind energy and solar energy and other sustainable and efficient energy storage devices, occupying a dominant position in the market, leading to a sharp increase in the demand for lithium resources in the energy market. However, the scarcity and uneven distribution of metallic l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/505
CPCH01M4/364H01M4/366H01M4/38H01M4/505Y02E60/10
Inventor 杨儒高昂李敏徐杰
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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