Preparation method and application of nitrogen-phosphorus double-doped graded porous carbon material

A hierarchical porous, double-doped technology, applied in the direction of active material electrodes, electrical components, battery electrodes, etc., can solve the problems of complex process and difficult control, and achieve the effect of low price, simple operation and high repeatability

Active Publication Date: 2020-02-11
HARBIN INST OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] This application is to solve the technical problems of complex process and difficult control in the existing method for preparing heteroatom-doped hierarchical porous carbon materials; and provides a nitrogen- Preparation method and application of phosphorus double-doped hierarchical porous carbon material

Method used

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  • Preparation method and application of nitrogen-phosphorus double-doped graded porous carbon material
  • Preparation method and application of nitrogen-phosphorus double-doped graded porous carbon material
  • Preparation method and application of nitrogen-phosphorus double-doped graded porous carbon material

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Embodiment 1

[0041] Embodiment 1: In this embodiment, the preparation method of nitrogen-phosphorus double-doped hierarchical porous carbon material is carried out according to the following steps:

[0042] Step 1. Dissolve 4.85mL aniline in 20mL with a concentration of 0.1mol L -1 In the phytic acid aqueous solution, stir and mix evenly;

[0043] Step 2, then add 10mL concentration of 2.5mol L -1 Aqueous ammonium persulfate solution, mixed evenly, left to react at 5°C for 12 hours, after the reaction, washed with water, and freeze-dried at -50°C for 36 hours to obtain polyaniline phytic acid airgel;

[0044] Step 3. Ultrasonic disperse 1 g of the polyaniline phytic acid airgel obtained in Step 2 in 100 g of NaCl aqueous solution with a mass fraction of 10%, and heat and evaporate to dryness at 80° C.;

[0045] Step 4, then carbonize in a nitrogen atmosphere at 900°C for 2h, treat with 10wt% sulfuric acid to remove soluble matter, wash with water, and vacuum dry at 100°C for 24h to obtai...

Embodiment 2

[0051] Embodiment 2: In this embodiment, the preparation method of nitrogen-phosphorus double-doped hierarchical porous carbon material is carried out according to the following steps:

[0052] Step 1. Dissolve 4.85mL aniline in 20mL with a concentration of 0.1mol L -1 In the phytic acid aqueous solution, stir and mix evenly;

[0053] Step 2, then add 10mL concentration of 2.5mol L -1 Aqueous ammonium persulfate solution, mixed evenly, left to react at 5°C for 12 hours, after the reaction, washed with water, and freeze-dried at -50°C for 36 hours to obtain polyaniline phytic acid airgel;

[0054] Step 3. Ultrasonic disperse 1 g of the polyaniline phytic acid airgel obtained in Step 2 in 100 g of LiCl aqueous solution with a mass fraction of 10%, and heat and evaporate to dryness at 80° C.;

[0055] Step 4, then carbonize in a nitrogen atmosphere at 700°C for 2h, treat with 10wt% sulfuric acid to remove soluble matter, wash with water, and vacuum dry at 100°C for 24h to obtai...

Embodiment 3

[0056] Embodiment 3: In this embodiment, the preparation method of nitrogen-phosphorus double-doped hierarchical porous carbon material is carried out according to the following steps:

[0057] Step 1. Dissolve 4.85mL aniline in 20mL with a concentration of 0.1mol L -1 In the phytic acid aqueous solution, stir and mix evenly;

[0058] Step 2, then add 10mL concentration of 2.5mol L -1 Aqueous ammonium persulfate solution, mixed evenly, left to react at 5°C for 12 hours, after the reaction, washed with water, and freeze-dried at -50°C for 36 hours to obtain polyaniline phytic acid airgel;

[0059] Step 3. Ultrasonic disperse 1 g of the polyaniline phytic acid airgel obtained in Step 2 in 100 g of 10% KCl aqueous solution by mass fraction, and heat and evaporate to dryness at 80° C.;

[0060] Step 4, then carbonize in nitrogen atmosphere at 800°C for 2h, treat with 10wt% sulfuric acid to remove soluble matter, wash with water, and vacuum dry at 100°C for 24h to obtain nitrogen...

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Abstract

The invention discloses a preparation method and application of a nitrogen-phosphorus double-doped graded porous carbon material, belongs to the technical field of battery positive electrode materialsand solves technical problems of complex process and difficulty in control in an existing method for preparing a heteroatom-doped graded porous carbon material. The method is characterized in that chloride inorganic salt is introduced into polyaniline-phytic acid aerogel with a three-dimensional connected framework, acid pickling and water washing are carried out after pyrolysis, soluble substances in the material are removed, a pore structure of the carbon material is changed, moreover, electrical conductivity of the carbon material is improved, and stability of the sulfur/carbon composite material in the battery circulation process is guaranteed. The preparation method disclosed by the invention is simple and feasible in operation process, suitable for mass production, relatively low incost and high in material preparation method repeatability. The preparation method is suitable for the sulfur anode carrier material of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of battery anode materials and relates to a preparation method and application of a nitrogen-phosphorus double-doped hierarchical porous carbon material, which is specifically prepared by assisting carbonization of chloride inorganic salts. Background technique [0002] With the increasingly prominent energy and environmental issues and the rapid development of electronic and electric equipment, traditional lithium-ion batteries have become increasingly difficult to meet people's needs for high-energy-density batteries. Lithium-sulfur batteries are considered to be a promising next-generation high-energy-density energy storage system due to their advantages of high energy density, low cost, and no pollution. However, the positive electrode materials in lithium-sulfur batteries have low electronic and ionic conductivity, large electrode volume changes during charging and discharging, and the dissolution of in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor 戴长松刘建超刘晨李如宏陈天瑞穆德颖万伟华魏俊华王振
Owner HARBIN INST OF TECH
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