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Preparation method of two-dimensional carbide crystal-based polyimide organic positive electrode material

A technology based on polyimide and two-dimensional carbide, which is applied in the fields of materials science and electrochemistry, can solve the problems of inability to obtain MXene, increase the diffusion resistance of lithium ions, and change the performance of MXene, and achieve good cycle stability and rate performance , Improve cycle stability, improve chemical reactivity

Active Publication Date: 2019-08-30
SHANGHAI INST OF TECH
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  • Abstract
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Problems solved by technology

For the preparation of MXene, chemical liquid phase etching is generally used, but only MXene with F, OH and other functional groups on the surface can be obtained, and pure MXene cannot be obtained, which may lead to changes in the performance of MXene
Moreover, when MXene is used as the positive electrode material, the presence of F and OH will increase the diffusion resistance of lithium ions and reduce the storage capacity.

Method used

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  • Preparation method of two-dimensional carbide crystal-based polyimide organic positive electrode material
  • Preparation method of two-dimensional carbide crystal-based polyimide organic positive electrode material
  • Preparation method of two-dimensional carbide crystal-based polyimide organic positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0024] The first step, preparation of two-dimensional carbide crystal-based polyimide composite material:

[0025] (1) Sonicate the N-methylpyrrolidone solution (5 mL) of MXene to form a uniformly mixed dispersion;

[0026] (2) Add 38.8 mg of naphthalene tetracarboxylic anhydride to the above dispersion, stir vigorously for half an hour, and the mass dosage ratio of added naphthalene tetracarboxylic anhydride to MXene is 2:1;

[0027] (3) Add 890 μL of NMP solution of ethylenediamine with a concentration of 10.56 mg / mL to the above solution, stir vigorously for half an hour, pour the mixture into the glass lining, and perform solvothermal at 150-180°C for 12 -24 hours.

[0028] The second step is to prepare a two-dimensional carbide crystal-based polyimide organic positive electrode material:

[0029] (1) The material obtained by solvothermal is put into a tube furnace for calcination in a nitrogen atmosphere, and kept at 400-500°C for 8-12 hours, and finally a two-dimension...

Embodiment 2

[0032] A method for preparing a two-dimensional carbide crystal-based polyimide organic positive electrode material, which solves the problem of composite construction of two-dimensional materials, includes the following steps:

[0033] (1) After MXene is centrifuged at high speed for many times to remove water, then dissolve MXene in NMP (methylpyrrolidone) solvent, and the concentration of MXeneN-methylpyrrolidone solution is 3 mg / ml;

[0034] (2) Naphthalenetetracarboxylic anhydride and ethylenediamine are added to the MXene solution, and the amount ratio of the added naphthalenetetracarboxylic anhydride and ethylenediamine is 1:1, and naphthalenetetracarboxylic anhydride is in the MXeneN-methylpyrrolidone solution The concentration is 12mg / ml, the temperature is controlled at 150°C, and after 20 hours of solvothermal in-situ polymerization;

[0035] (3) In a nitrogen atmosphere, control the high-temperature carbonization treatment temperature to 400° C. for 10 h, and obtai...

Embodiment 3

[0037] A method for preparing a two-dimensional carbide crystal-based polyimide organic positive electrode material, which solves the problem of composite construction of two-dimensional materials, includes the following steps:

[0038] (1) After MXene is centrifuged at high speed for many times to remove water, then dissolve MXene in NMP (methylpyrrolidone) solvent, and the concentration of MXeneN-methylpyrrolidone solution is 3 mg / ml;

[0039](2) Naphthalenetetracarboxylic anhydride and ethylenediamine are added to the MXene solution, and the amount ratio of the added naphthalenetetracarboxylic anhydride and ethylenediamine is 1:1.08, and naphthalenetetracarboxylic anhydride is in the MXeneN-methylpyrrolidone solution The concentration is 14mg / ml, the temperature is controlled at 180°C, and after 18 hours of solvothermal in-situ polymerization;

[0040] (3) In a nitrogen atmosphere, control the high-temperature carbonization treatment temperature to 400° C. for 9 hours, and ...

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Abstract

The invention relates to a preparation method of a two-dimensional carbide crystal-based polyimide organic positive electrode material. A two-dimensional carbide crystal (MXene) with a structure is adopted as a substrate material, and polyimide (PI) is in-situ polymerized on the MXene substrate by a solvothermal method, and then carbonizing is carried out in a nitrogen atmosphere to obtain the two-dimensional carbide crystal-based polyimide organic positive electrode material. The PI obtained by the method is uniformly loaded on the MXene substrate, and the method has the advantages of simpleprocess, mild conditions, low cost and the like. The prepared carbide-based polyimide organic positive electrode material with a two-dimensional structure has excellent electrochemical performance when being used as a positive electrode of a lithium ion battery, has excellent rate performance that the capacity can reach 150 mAh*g<-1> under a charge-discharge current of 50 mA*g<-1> and the capacityis 30 mAh*g<-1> under 500 A*g<-1>, and has a super long circulation life that the capacity retention rate exceeds 70% after 1000 times of circulation at 0.5 A*g<-1>. The method provides good experimental data and theoretical support for research and application of MXene and organic materials in the electrochemical field.

Description

technical field [0001] The invention belongs to the field of material science and electrochemical technology, and in particular relates to a preparation method of a two-dimensional carbide crystal-based polyimide organic positive electrode material. Background technique [0002] With the development and progress of the automobile industry, the sustainable development of human beings is facing great challenges. The combustion of non-renewable fuels releases various exhaust gases that cause various problems. Therefore, it is particularly important to seek renewable and sustainable resource energy storage devices. Among them, rechargeable batteries are economical, environmentally friendly, have high power, and long life. Compared with non-renewable energy sources, rechargeable batteries realize the sustainable utilization of energy. In particular, lithium-ion batteries have become one of the most important rechargeable batteries due to their advantages such as high energy den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08K7/04H01M4/60H01M10/0525
CPCC08G73/1007C08G73/1082C08K7/04H01M4/608H01M10/0525Y02E60/10
Inventor 黄燕山马健韩生李原婷常宾高丽杨圆圆尹佳彬
Owner SHANGHAI INST OF TECH
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