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Phosphorus-doped nitrogen-rich porous carbon nanosheet as well as preparation method and application thereof

A technology of porous carbon and phosphorus doping, applied in nanotechnology, nanocarbon, and nanotechnology for materials and surface science, can solve the problems of low proportion of active nitrogen, storage performance needs to be improved, etc., to increase the content of active nitrogen , excellent electrochemical performance, and strong operability

Active Publication Date: 2022-05-10
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, carbonaceous materials doped with nitrogen atoms have fewer defects and edge sites, resulting in a lower proportion of active nitrogen, so the storage performance of nitrogen-doped carbonaceous materials for potassium needs to be improved.

Method used

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  • Phosphorus-doped nitrogen-rich porous carbon nanosheet as well as preparation method and application thereof
  • Phosphorus-doped nitrogen-rich porous carbon nanosheet as well as preparation method and application thereof
  • Phosphorus-doped nitrogen-rich porous carbon nanosheet as well as preparation method and application thereof

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preparation example Construction

[0032] The preparation method of the invention can prepare phosphorus-doped nitrogen-rich porous carbon nanosheets, and can solve the problems of low content of pyrrole-N and pyridine-N, poor activity, complex reaction in the preparation process, environmental pollution and the like.

[0033] The transition metal nitrate of the present invention is a nitrate compound in which the cation is a transition metal ion, and the transition metal may be cadmium, zinc, copper or the like. The preferred cadmium salt of the present invention, cadmium salt is the compound that cation is cadmium ion, when selecting Cd(NO 3 ) 2 4H 2 O, can better solve the problem of low content of pyrrole-N and pyridine-N and poor activity.

[0034] In some examples of this embodiment, the molar ratio of transition metal nitrate to hexamethylenetetramine is 1:1˜3. At this time, more metal hexamine framework precursors can be guaranteed.

[0035] In some examples of this embodiment, during the reaction p...

Embodiment approach

[0044] The third embodiment of the present invention provides an application of the phosphorus-doped nitrogen-rich porous carbon nanosheets in a potassium-ion battery. Especially in the application of potassium ion battery negative electrode.

[0045] The fourth embodiment of the present invention provides a negative electrode for a potassium ion battery, including a current collector and an active component, wherein the active component is the above-mentioned phosphorus-doped nitrogen-rich porous carbon nanosheet.

[0046] In some examples of this embodiment, the preparation method is as follows: ball mill nitrogen-rich porous carbon nanosheets doped with phosphorus to regulate nitrogen activity into powder, mix with adhesive and conductive carbon black evenly, add solvent, and mix evenly to form a glue shape, roll the jelly onto the current collector.

[0047] The fifth embodiment of the present invention provides a potassium-ion battery, including the above-mentioned negativ...

Embodiment 1

[0054] Preparation of phosphorus-doped nitrogen-rich porous carbon nanosheets.

[0055] (1) Preparation of two-dimensional N / C nanosheets:

[0056] ①Cd(NO 3 ) 2 4H 2 O and HMT were added into 340mL and 560mL ethanol solutions respectively and stirred evenly.

[0057] ② the step ① obtained Cd (NO 3 ) 2 The solution was added dropwise to the HMT solution to produce white precipitate immediately, in order to obtain enough Cd-HMT MHF, the mixed solution was continued to stir for 24h.

[0058] ③ The precipitate obtained in step ② was repeatedly washed with ethanol for several times, and then dried in an oven at 80°C for 12 hours to obtain Cd-HMT MHF.

[0059] ④The Cd-HMT MHF obtained above was heated up to 1000°C at a rate of 3°C / min in Ar atmosphere and under Ar flow, and then kept for 2h to obtain two-dimensional N / C nanosheets, as Figure 1~4 shown.

[0060] (2) Preparation of phosphorus-doped nitrogen-rich porous carbon nanosheets.

[0061] The two-dimensional N / C nano...

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Abstract

The invention belongs to the technical field of potassium ion batteries, and relates to a phosphorus-doped nitrogen-rich porous carbon nanosheet as well as a preparation method and application thereof. Transition metal nitrate and hexamethylenetetramine are subjected to hydrogen-bond interaction in an ethanol solution to form a metal hexamine framework precursor, the metal hexamine framework precursor is subjected to pyrolysis in an inert atmosphere to obtain an N / C precursor, the N / C precursor and sodium hypophosphite are subjected to heating phosphating treatment in the inert atmosphere, and cooling is performed to obtain the composite material. According to the invention, the N-doped carbon material with enough defects and edge sites is constructed by doping phosphorus, so that a relatively high active N ratio is realized, the storage performance of potassium is improved, and meanwhile, an advanced electrode material with high conductivity, good rate capability and high cycling stability can be obtained by an economical and efficient method.

Description

technical field [0001] The invention belongs to the technical field of potassium ion batteries, and relates to a phosphorus-doped nitrogen-rich porous carbon nanosheet and a preparation method and application thereof. 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] Nitrogen atom doping is one of the effective methods to improve the potassium storage performance of carbonaceous materials as anode materials for potassium ion batteries. It can effectively adjust the surface functional groups, local electronic structure and chemical properties, improve electronic conductivity, electrolyte wettability and generate Stronger potassium storage active sites to improve potassium st...

Claims

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Application Information

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IPC IPC(8): C01B32/15H01M4/36H01M4/38H01M4/583H01M10/054B82Y30/00B82Y40/00
CPCC01B32/15H01M4/362H01M4/38H01M4/583H01M10/054B82Y30/00B82Y40/00C01P2006/40C01P2004/03C01P2004/04C01P2002/72H01M2004/027Y02E60/10
Inventor 周国伟董旭晟赵瑞正孙彬高婷婷李华鹏
Owner QILU UNIV OF TECH
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