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Potassium ion battery negative electrode material as well as preparation method and application thereof

A battery negative electrode and potassium ion technology, applied in the field of electrochemistry, can solve the problems of irreversible capacity loss, restricting the development of potassium storage materials, and destroying the structure of electrode materials, etc., achieving excellent cycle stability, improved electrochemical performance, and increased discharge specific capacity Effect

Pending Publication Date: 2021-05-14
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although potassium-ion batteries have energy density and resources, the large ionic radius of potassium ions will cause large structural damage to electrode materials, resulting in very significant irreversible capacity loss.
This largely restricts the development of potassium storage materials

Method used

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  • Potassium ion battery negative electrode material as well as preparation method and application thereof
  • Potassium ion battery negative electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Surface modification treatment:

[0025] Put the multi-walled carbon nanotubes into the SAOT YZD08-5C plasma generator, use radio frequency 12MHz to generate plasma, and select high-purity nitrogen as the working gas, the working power is 120w, the working vacuum is 45Pa, and the processing time is 30 minutes. After processing the samples were redistributed and processed again with the previous parameters to ensure uniformity. Finally, modified multi-walled carbon nanotubes are obtained.

[0026] (2) Preparation of anode materials for potassium ion batteries:

[0027] Weigh 80 mg of surface-modified multi-walled carbon nanotube powder, put it into a mortar and grind for 30 min, after grinding evenly, then weigh 10 mg of conductive agent acetylene black and add it into the mortar, and continue grinding for 30 min. The ground mixture was placed in a small stirring pot, and 10 mg of sodium carboxymethylcellulose was added to it. Then the small stirring pot was place...

Embodiment 2

[0030] (1) Surface modification treatment:

[0031] Put the multi-walled carbon nanotubes into the SAOT YZD08-5C plasma generator, use radio frequency 15MHz to generate plasma, and select high-purity nitrogen as the working gas, the working power is 150w, the working vacuum is 80Pa, and the treatment time is 10 minutes. The samples were then redistributed and processed again with the previous parameters to ensure uniformity. Finally, modified multi-walled carbon nanotubes are obtained.

[0032] (2) Preparation of anode materials for potassium ion batteries:

[0033] Weigh 80 mg of surface-modified multi-walled carbon nanotube powder, put it into a mortar and grind for 30 min, after grinding evenly, then weigh 10 mg of conductive agent acetylene black and add it into the mortar, and continue grinding for 30 min. The ground mixture was placed in a small stirring pot, and 10 mg of sodium carboxymethylcellulose was added to it. Then the small stirring pot was placed on a magnet...

Embodiment 3

[0035] (1) Surface modification treatment:

[0036] Put the multi-walled carbon nanotubes into the SAOT YZD08-5C plasma generator, use radio frequency 15MHz to generate plasma, and select high-purity nitrogen as the working gas, the working power is 170w, the working vacuum is 80Pa, and the treatment time is 10 minutes. The samples were then redistributed and processed again with the previous parameters to ensure uniformity. Finally, modified multi-walled carbon nanotubes are obtained.

[0037] (2) Preparation of anode materials for potassium ion batteries:

[0038] Weigh 80 mg of surface-modified multi-walled carbon nanotube powder, put it into a mortar and grind for 30 min, after grinding evenly, then weigh 10 mg of conductive agent acetylene black and add it into the mortar, and continue grinding for 30 min. The ground mixture was placed in a small stirring pot, and 10 mg of sodium carboxymethylcellulose was added to it. Then the small stirring pot was placed on a magnet...

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Abstract

The invention provides a potassium ion battery negative electrode material and a preparation method and application thereof, and belongs to the technical field of electrochemistry. The method comprises the following steps: firstly, carrying out N doping treatment on a multi-walled carbon nanotube in a high-purity nitrogen (99.99%) environment by adopting low-temperature plasma, and then preparing a negative electrode material of the potassium ion battery based on the modified multi-walled carbon nanotube. The electrode subjected to N doping treatment has higher specific capacity than an original multi-walled carbon nanotube electrode; and the prepared potassium ion battery negative electrode material is beneficial to improving the cruising mileage of an electric automobile, and making up the defect that the mileage of the electric automobile is short.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a negative electrode material for a potassium ion battery and a preparation method and application thereof. Background technique [0002] At present, compared with lithium resources, potassium resources are more abundant in the earth's crust, and the standard electrode potential of potassium is about 0.1 V~0.15 V lower than lithium in some solvents. Therefore, compared with sodium-ion batteries, potassium-ion batteries It is more advantageous in energy density. Although potassium-ion batteries have energy density and resources, the large ionic radius of potassium ions will cause large structural damage to electrode materials, resulting in a very significant irreversible capacity loss. This largely restricts the development of potassium storage materials. [0003] At present, multi-walled carbon nanotubes have good cycle stability, but the specific capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/168H01M4/587H01M10/054
CPCC01B32/168H01M4/587H01M10/054C01B2202/06C01B2202/22H01M2004/021H01M2004/027Y02E60/10
Inventor 刘良李超顾延光王瑞帅谢源盘朝奉
Owner JIANGSU UNIV
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