High-phosphorus-nitrogen co-doped three-dimensional porous carbon block and preparation method and application thereof

A three-dimensional porous, co-doping technology, used in the preparation/purification of carbon, structural parts, electrical components, etc., can solve the problems of difficult to achieve high phosphorus atom content and controllable doping, and achieve excellent reversible specific capacity, Excellent electrochemical performance, the effect of increasing nitrogen content

Active Publication Date: 2020-07-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because phosphorus has a large atomic radius, it is difficult to achieve high content and controllable doping of phosphorus atoms in carbon materials.

Method used

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  • High-phosphorus-nitrogen co-doped three-dimensional porous carbon block and preparation method and application thereof
  • High-phosphorus-nitrogen co-doped three-dimensional porous carbon block and preparation method and application thereof
  • High-phosphorus-nitrogen co-doped three-dimensional porous carbon block and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The preparation method of the high phosphorus-nitrogen co-doped three-dimensional porous carbon block (named PN-PCM) for the negative electrode of the potassium ion battery involved in the present embodiment comprises the following steps:

[0049] (1) Fully dissolve polyacrylonitrile powder and polymethyl methacrylate in dimethyl sulfoxide at a mass ratio of 4:1, the total amount of polyacrylonitrile powder and polymethyl methacrylate and solvent dimethyl The mass ratio of radical sulfoxide is 1:9. Part of the solvent is evaporated, and after trimming, hot pressing at 160°C and 10Mpa for 10 minutes to form a block and punching, the polyacrylonitrile-based foam is obtained by foaming with supercritical carbon dioxide. The foaming condition of supercritical carbon dioxide is: in the autoclave, CO 2 Afterwards, the temperature was raised to 140°C, and the pressure was increased to 31.09Mpa, kept for 1.5h and then quickly released.

[0050] (2) Prepare a 20g / L aqueous sol...

Embodiment 2

[0056] The preparation method of the high phosphorus-nitrogen co-doped three-dimensional porous carbon block (named PN-PCM-L) for the negative electrode of the potassium ion battery involved in the present embodiment comprises the following steps:

[0057] (1) Fully dissolve polyacrylonitrile powder and polymethyl methacrylate in dimethyl sulfoxide at a mass ratio of 4:1, the total amount of polyacrylonitrile powder and polymethyl methacrylate and solvent dimethyl The mass ratio of radical sulfoxide is 1:9. Part of the solvent was evaporated, and polyacrylonitrile-based foam was obtained by foaming with supercritical carbon dioxide after trimming, hot pressing at 160°C and 10Mpa for 10 minutes and punching. The foaming condition of supercritical carbon dioxide is: in the autoclave, CO 2 Afterwards, the temperature was raised to 140°C, and the pressure was increased to 31.09Mpa, kept for 1.5h and then quickly released.

[0058] (2) Prepare a 20g / L aqueous solution of hydroxyl...

Embodiment 3

[0064] The preparation method of the high phosphorus-nitrogen co-doped three-dimensional porous carbon block (named PN-PCM-H) for the negative electrode of the potassium ion battery involved in the present embodiment comprises the following steps:

[0065] (1) Fully dissolve polyacrylonitrile powder and polymethyl methacrylate in dimethyl sulfoxide at a mass ratio of 4:1, the total amount of polyacrylonitrile powder and polymethyl methacrylate and solvent dimethyl The mass ratio of radical sulfoxide is 1:9. Part of the solvent was evaporated, and polyacrylonitrile-based foam was obtained by foaming with supercritical carbon dioxide after trimming, hot pressing at 160°C and 10Mpa for 10 minutes and punching. The foaming condition of supercritical carbon dioxide is: in the autoclave, CO 2 Afterwards, the temperature was raised to 140°C, and the pressure was increased to 31.09Mpa, kept for 1.5h and then quickly released.

[0066] (2) Prepare a 20g / L aqueous solution of hydroxyl...

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Abstract

The invention provides a high-phosphorus-nitrogen co-doped three-dimensional porous carbon block and a preparation method and application thereof, the carbon block has a three-dimensional interconnected macroporous open pore structure, a small amount of mesopores and micropores are distributed in the structure, the BET specific surface area is 5-30 m<2>g<-1 >, and the carbon block contains 50-85 at% of carbon element, 2-20 at% of phosphorus element, 2-20 at% of nitrogen element and 5-40 at% of oxygen element. The high-phosphorus-nitrogen co-doped three-dimensional porous carbon block can be used as a battery electrode material, and especially when the high-phosphorus-nitrogen co-doped three-dimensional porous carbon block is used as a negative electrode of a potassium ion battery, an excellent reversible specific capacity, initial coulombic efficiency, rate capability and cycling stability can be considered.

Description

technical field [0001] The invention relates to the technical field of preparation of porous carbon materials, in particular to a high phosphorus-nitrogen co-doped three-dimensional porous carbon block and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Lithium-ion batteries have been widely used in the energy supply of various portable electronic devices and power tools due to their unique energy storage advantages. However, the further large-scale application of lithium-ion batteries is limited due to insufficient reserves of lithium resources and rising prices. Potassium-ion batteries have emerged as outstanding candidates for n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/583H01M10/054
CPCC01B32/05H01M4/583H01M10/054Y02E60/10
Inventor 赵国群龚洁
Owner SHANDONG UNIV
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