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Potassium ion battery positive electrode active material, preparation method thereo fand application thereof

A battery cathode and active material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor cycle performance and dead potassium battery rate performance, and achieve long cycle life, excellent rate performance, and extended cycle life. Effect

Active Publication Date: 2020-03-13
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems of negative electrode potassium dendrites and dead potassium produced by traditional potassium ion batteries, as well as poor battery rate performance and cycle performance, a positive electrode active material for potassium ion batteries and its preparation method and application are provided

Method used

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  • Potassium ion battery positive electrode active material, preparation method thereo fand application thereof
  • Potassium ion battery positive electrode active material, preparation method thereo fand application thereof
  • Potassium ion battery positive electrode active material, preparation method thereo fand application thereof

Examples

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Effect test

Embodiment 1

[0039] A positive electrode active material for potassium-ion batteries-carbon-coated zirconium-doped NaTi 2 (PO 4 ) 3 A preparation method comprising the steps of:

[0040] (1) Stir and disperse 1.8g of sodium dihydrogen phosphate, 2.397g of titanium dioxide, 5.176g of ammonium dihydrogen phosphate, and 0.9g of glucose in 20mL of distilled water, add 0.2g of zirconia and 3mL of ethanol, place them in an agate ball mill jar, add oxidation Zirconium beads, the mass ratio of balls is 1:1, ball milling at a speed of 500rpm for 5h to obtain a slurry, which is spray-dried at a temperature of 160°C and a drying flow rate of 20L / min to obtain a precursor;

[0041] (2) Place the precursor in a tubular heating furnace connected to a vacuum pump for vacuum annealing. During the treatment process, the vacuum is continuously pumped, and the temperature is raised to 300°C in the first program at a rate of 5°C / min under a vacuum atmosphere. , keep the temperature for 5 hours, then carry ...

Embodiment 2

[0047] A positive electrode active material for potassium-ion batteries-carbon-coated zirconium-doped NaTi 2 (PO 4 ) 3 A preparation method comprising the steps of:

[0048] (1) Stir and dissolve 1.8g of sodium dihydrogen phosphate, 1.9g of titanium dioxide, 3.45g of ammonium dihydrogen phosphate, and 0.27g of glucose in 30mL of distilled water, add 0.18g of zirconia and 4mL of ethanol, put them in an agate ball mill jar, add oxidation Zirconium beads, the mass ratio of balls is 1:1, ball milling at a speed of 400rpm for 7h to obtain a slurry, which is spray-dried at a temperature of 170°C and a drying flow rate of 10L / min to obtain a precursor;

[0049] (2) Place the precursor in a tube-type heating furnace connected to a vacuum pump for vacuum annealing. During the treatment process, the vacuum is continuously pumped, and the temperature is raised to 350°C in the first program at a rate of 3°C / min under a vacuum atmosphere. , keep the temperature for 3h, and then carry ou...

Embodiment 3

[0052] A positive electrode active material for potassium-ion batteries-carbon-coated zirconium-doped NaTi 2 (PO 4 ) 3 A preparation method comprising the steps of:

[0053] (1) Stir and dissolve 1.8g of sodium citrate, 3.6g of tetraethyl titanate, 6.9g of phosphoric acid, and 5.4g of glucose in 40mL of distilled water, add 0.27g of zirconia and 8mL of ethanol, put them in an agate ball mill jar, add oxidation Zirconium beads, the mass ratio of balls is 1:1, ball milling at a speed of 600rpm for 4h to obtain a slurry, which is spray-dried at a temperature of 150°C and a drying flow rate of 25L / min to obtain a precursor;

[0054] (2) Place the precursor in a tube-type heating furnace connected to a vacuum pump for vacuum annealing. During the treatment process, the vacuum is continuously pumped, and the temperature is raised to 700°C in the second program at a rate of 2°C / min under a vacuum atmosphere. , constant temperature for 2h, and naturally cooled to room temperature a...

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Abstract

The invention relates to a potassium ion battery positive electrode active material, a preparation method thereof and application thereof. The preparation method comprises the following steps: stirring and dissolving a sodium source, a titanium source, a phosphorus source and a carbon source in water, adding zirconium oxide and ethanol, carrying out ball milling treatment to obtain slurry, carrying out spray drying treatment on the slurry to obtain a precursor, carrying out vacuum annealing treatment on the precursor, and carrying out air cooling to room temperature to obtain carbon-coated zirconium-doped NaTi2 (PO4) 3.Carbon-coated zirconium-doped NaTi2 (PO4) 3 prepared by a ball milling-spray drying method is used as a positive electrode material, flaky metal potassium is used as a negative electrode material, and a potassium ion solution is used as an electrolyte to assemble the total battery; the total battery is high in energy density, long in cycle life and excellent in rate capability, the electrode material synthesis method is low in cost and environmentally friendly, the electrolyte is safe, non-toxic, stable, pollution-free and low in price, and possibility is provided for practical application of the potassium ion battery in the aspect of power grid energy storage.

Description

technical field [0001] The invention relates to the technical field of potassium ion batteries, in particular to a positive electrode active material of a potassium ion battery and a preparation method and application thereof. Background technique [0002] Due to the demand for energy storage technology in the grid, different energy storage systems are used as energy storage devices for research. Potassium-ion batteries are very promising candidates in this field due to their abundant raw material sources, environmental friendliness, high energy density, and low price, and have attracted widespread attention. [0003] The traditional potassium ion battery is an organic electrolyte system, and the positive electrode material generally uses K 0.3 MnO 2 , KFeSO 4 F, materials such as organic anthraquinones. Komaba (Journal of Materials Chemistry A, 2017, 5(9): 4325-4330.) et al. reported that the Prussian blue material with a pore structure can reversibly deintercalate pota...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/485H01M4/36H01M4/62H01M4/583H01M10/054
CPCH01M4/5825H01M4/485H01M4/366H01M4/625H01M4/583H01M10/054Y02E60/10
Inventor 侯之国熊亚丽宋忠诚张雪倩董梦飞
Owner JIANGSU UNIV OF TECH
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