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Preparation method of polyimide composite electrode material containing ketone carbonyl bond chain structure

A polyimide and composite electrode technology, applied in structural parts, battery electrodes, circuits, etc., can solve the problems of sacrificial electrode material specific capacity, reduction of theoretical specific capacity, and unsatisfactory overall cycle performance, so as to avoid theoretical specific capacity Effect of reducing, reducing solubility, high cycle stability

Active Publication Date: 2020-09-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, compared with inorganic batteries, organic lithium-ion batteries also have their own defects.
Small organic molecules have a high theoretical specific capacity, but they are easily dissolved in the electrolyte, so the overall cycle performance is not ideal
Although organic polymers can effectively reduce solubility, the molecular structure often contains a large number of inactive groups, which leads to a decrease in theoretical specific capacity. Therefore, additional active groups are introduced into the polymer molecular chain structure to maintain its high theoretical capacity. The specific capacity is especially important
In addition, in order to improve the conductive properties of polymers, composite electrodes are often prepared by combining polymers with conductive materials such as carbon nanotubes and graphene by means of π-π interactions, which also sacrifices part of the specific capacity of electrode materials.

Method used

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  • Preparation method of polyimide composite electrode material containing ketone carbonyl bond chain structure
  • Preparation method of polyimide composite electrode material containing ketone carbonyl bond chain structure
  • Preparation method of polyimide composite electrode material containing ketone carbonyl bond chain structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) 0.5g 4-amino-benzoic acid, 0.5g multi-walled carbon nanotubes (MWCNTs), 20g polyphosphoric acid (PPA) and 5g phosphorus pentoxide (P 2 o 5 ) into a 250ml three-necked flask in turn, and the reaction medium was heated and stirred under a nitrogen atmosphere. The reaction mixture was heated to 80°C for 1 hour, 100°C for 1 hour, and finally 130°C for 72 hours. After the reaction, the mixture was poured into distilled water. The resulting powdery product was filtered by suction and washed with dilute ammonium hydroxide, then Soxhlet extracted with deionized water for 3 days to remove residual reaction medium, and then Soxhlet extracted with methanol for 3 days to remove unreacted 4-amino-benzoic acid, Finally, dark brown aminated carbon nanotubes were obtained by freeze-drying.

[0034] (2) Under nitrogen protection, ultrasonically disperse 0.5 g of the aminated carbon nanotubes obtained in step (1) in 100 mL of NMP in a 250 mL three-necked flask, and then add 1.16 g...

Embodiment 2

[0037] (1) 0.5g 4-amino-benzoic acid, 0.5g graphene oxide, 20g polyphosphoric acid (PPA) and 5g phosphorus pentoxide (P 2 o 5) into a 250ml three-necked flask in turn, and the reaction medium was heated and stirred under a nitrogen atmosphere. The reaction mixture was heated to 80°C for 1 hour, 100°C for 1 hour, and finally 130°C for 72 hours. After the reaction, the mixture was poured into distilled water. The resulting powdery product was filtered by suction and washed with dilute ammonium hydroxide, then Soxhlet extracted with deionized water for 3 days to remove residual reaction medium, and then Soxhlet extracted with methanol for 3 days to remove unreacted 4-amino-benzoic acid, Finally, dark brown aminated graphene oxide was obtained by freeze-drying.

[0038] (2) Under nitrogen protection, ultrasonically disperse 0.5 g of the aminated graphene oxide obtained in step (1) in 100 mL of DMF in a 250 mL three-necked flask, and then add 1.16 g of p-aminoanthraquinone, 1.09...

Embodiment 3

[0041] (1) 0.5g 4-amino-benzoic acid, 0.5g multi-walled carbon nanotubes (MWCNTs), 20g polyphosphoric acid (PPA) and 5g phosphorus pentoxide (P 2 o 5 ) into a 250ml three-necked flask in turn, and the reaction medium was heated and stirred under a nitrogen atmosphere. The reaction mixture was heated to 80°C for 1 hour, 100°C for 1 hour, and finally 130°C for 72 hours. After the reaction, the mixture was poured into distilled water. The resulting powdery product was filtered by suction and washed with dilute ammonium hydroxide, then Soxhlet extracted with deionized water for 3 days to remove residual reaction medium, and then Soxhlet extracted with methanol for 3 days to remove unreacted 4-amino-benzoic acid, Finally, dark brown aminated carbon nanotubes were obtained by freeze-drying.

[0042] (2) Under nitrogen protection, ultrasonically disperse 0.5 g of the aminated carbon nanotubes obtained in step (1) in 50 mL of NMP in a 100 mL three-necked flask, and then add 0.54 g ...

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Abstract

The invention relates to a preparation method of a polyimide composite electrode material containing a ketone carbonyl bond chain structure. The method comprises the following steps: (1) by using an aminobenzoic acid derivative as an acylation reagent, carrying out amino functional modification on a carbon nano material by using a Friedel-Crafts acylation reaction to obtain an aminated carbon substrate material; (2) ultrasonically dispersing an aminated carbon substrate material into a solvent, then sequentially adding a diamine monomer and a dianhydride monomer under the protection of nitrogen, carrying out high-temperature reaction, and then cooling, filtering, washing and carrying out vacuum drying to obtain powder; and carrying out heat treatment in an inert atmosphere, to obtain the material. When the composite electrode material is used as a lithium ion battery negative electrode material, the composite electrode material has the electrochemical characteristics of high specific capacity, high multiplying power and high cycling stability.

Description

technical field [0001] The invention belongs to the field of electrode materials, in particular to a method for preparing a polyimide composite electrode material with a ketone carbonyl bond chain structure. Background technique [0002] As an important chemical power source, lithium-ion batteries have gradually expanded their application market with the development of the times and technology, and are gradually moving from small electrical appliances such as mobile phones and notebook computers to the field of electric vehicles, thus affecting the energy density, power density, etc. Performance puts forward higher requirements. The performance improvement of lithium-ion batteries is closely related to the characteristics of electrode materials. Traditional lithium-ion batteries are limited by the capacity of electrode materials and cannot meet the current market demand. In addition, heavy metals such as cobalt and nickel contained in inorganic materials will seriously pollu...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/60H01M10/0525H01M10/42
CPCH01M4/362H01M4/606H01M10/0525H01M10/4235Y02E60/10
Inventor 赵昕巴兆虎张清华董杰王振兴
Owner DONGHUA UNIV
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