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Potassium metal battery negative electrode, preparation method and application thereof, and potassium metal battery

A metal battery, negative electrode technology, applied in battery electrodes, electrode carriers/current collectors, negative electrodes, etc., can solve the problems of poor copper affinity, unsatisfactory electrochemical performance, large nucleation overpotential, etc., and achieve uniform deposition. , The effect of inhibiting the growth of dendrites and high coulombic efficiency

Active Publication Date: 2021-11-26
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor affinity of metal potassium to copper, there is a large nucleation overpotential in the process of potassium deposition.
Therefore, the electrochemical performance is not satisfactory

Method used

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  • Potassium metal battery negative electrode, preparation method and application thereof, and potassium metal battery
  • Potassium metal battery negative electrode, preparation method and application thereof, and potassium metal battery
  • Potassium metal battery negative electrode, preparation method and application thereof, and potassium metal battery

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preparation example Construction

[0031] Such as Figure 6 As shown, the present invention also provides a method for preparing the negative electrode of the potassium metal battery described in the above technical scheme, comprising the following steps:

[0032] Immersing foamed copper in a chloroauric acid solution to obtain a gold-loaded foamed copper current collector;

[0033] Pressing the gold-loaded copper foam current collector and the potassium sheet to obtain the negative electrode of the potassium metal battery;

[0034] The gold-loaded copper foam current collector and potassium flakes were of the same size.

[0035] In the present invention, unless otherwise specified, all preparation materials are commercially available products well known to those skilled in the art.

[0036] In the invention, the copper foam is impregnated in a chloroauric acid solution to obtain a gold-loaded copper foam current collector.

[0037] In the present invention, the concentration of the chloroauric acid solution...

Embodiment 1

[0072] Mix 200mg of chloroauric acid trihydrate with 60mL deionized, and stir evenly to obtain a chloroauric acid solution;

[0073] Foam copper (thickness is 1mm) is placed in the hydrochloric acid solution of 1mol / L 5min, removes the oxide on the surface, then washes with deionized water and absolute ethanol successively, dries, obtains the pretreated foam copper;

[0074] After immersing 15g of pretreated foamed copper in 60mL of the chloroauric acid solution under static conditions for 1min, wash with deionized water, and vacuum-dry at 80°C for 9h to obtain a gold-loaded copper foam current collector ;

[0075] Under an argon atmosphere, the gold-loaded copper foam current collector and the potassium sheet (0.4 mm in thickness) were cut into a circle with a diameter of 12 mm, then stacked and laminated, and pressed using a tablet press. The combined pressure is 150psi, and the holding time is 30s, so that the potassium sheet is completely embedded in the pores of the gold...

Embodiment 2

[0084] Mix 200mg of chloroauric acid trihydrate with 60mL deionized, and stir evenly to obtain a chloroauric acid solution;

[0085] Foam copper (thickness is 1mm) is placed in the hydrochloric acid solution of 1mol / L 5min, removes the oxide on the surface, then washes with deionized water and absolute ethanol successively, dries, obtains the pretreated foam copper;

[0086] After immersing 10 g of pretreated foamed copper in 60 mL of the chloroauric acid solution under static conditions for 1.5 min, wash it with deionized water, and dry it in vacuum at 80 ° C for 11 h to obtain a gold-loaded foamed copper aggregate. fluid;

[0087] Under an argon atmosphere, the gold-loaded copper foam current collector and the potassium sheet (thickness 0.4mm) were cut into a circle with a diameter of 12mm, and then stacked and laminated using a tablet press. The combined pressure is 150psi, and the holding time is 30s, so that the potassium sheet is completely embedded in the pores of the ...

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Abstract

The invention relates to the technical field of potassium metal batteries, in particular to a potassium metal battery negative electrode, a preparation method and application thereof and a potassium metal battery. The negative electrode of the potassium metal battery provided by the invention comprises a gold-loaded foamy copper current collector and a potassium sheet. The potassium sheet is embedded in the pore structure of the gold-loaded foamy copper current collector. According to the invention, the three-dimensional porous structure in the foamy copper current collector limits the volume expansion of the potassium negative electrode in the circulation process; gold has a low nucleation overpotential, is a preferential deposition site of potassium ions in the battery cycle process, and can make the potassium metal deposit more uniform, thereby inhibiting the growth of dendritic crystals. Therefore, the negative electrode of the potassium metal battery can remarkably reduce volume expansion of the potassium metal and inhibit growth of dendritic crystals in the cycle process, and relatively high coulombic efficiency, relatively long cycle life and excellent rate capability are realized.

Description

technical field [0001] The invention relates to the technical field of potassium metal batteries, in particular to a negative electrode of a potassium metal battery, a preparation method and application thereof, and a potassium metal battery. Background technique [0002] Among traditional secondary batteries, lithium-ion batteries have the advantages of very high energy density, high working voltage, environmental friendliness and no memory effect, and occupy a large share in the market. However, with continuous development, the positive and negative electrodes of commercial lithium-ion batteries are close to their theoretical capacity, and the improvement of energy density has encountered a bottleneck. With the rapid development of portable electronic devices, electric vehicles and smart grids, people's demand for high-capacity batteries is increasing. Therefore, metal batteries have returned to the field of vision of scientific researchers. Due to its ultra-high theoret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/80H01M4/66H01M4/62H01M4/1395H01M10/054
CPCH01M4/134H01M4/808H01M4/661H01M4/628H01M4/1395H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 颜蔚李红伟张久俊王健宜
Owner SHANGHAI UNIV
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