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Preparation method of high-performance polyimide and application of the high-performance polyimide in lithium battery electrode

A polyimide, high-performance technology, applied in the field of organic synthesis, can solve the problems of unsatisfactory mechanical properties and chemical stability, high crystallinity of PVDF, unsmooth use process, etc., and achieve excellent erasability and electrolysis resistance Good liquid and bending resistance, easy operation

Inactive Publication Date: 2019-08-16
汕头市鲁汕化工原料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high crystallinity, unsmooth use process, large charge and discharge load, unsatisfactory mechanical properties and chemical stability of PVDF used in existing lithium ion batteries, and propose a high-performance polymer Preparation method of imide and its application in lithium battery electrode

Method used

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  • Preparation method of high-performance polyimide and application of the high-performance polyimide in lithium battery electrode

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Effect test

Embodiment 1

[0020] A kind of high-performance polyimide preparation method proposed by the present invention and its application in lithium battery electrode comprise the following steps:

[0021] S1. Weigh 3,3'4,4-diphenylmethyl ether tetra-acid dianhydride, put it in a reaction flask, and pass nitrogen gas into the reaction flask for 20 minutes, then add N,N-dimethylacetamide, Stir at a speed of 200r / min until the 3,3'4,4-diphenylmethyl ether tetra-acid dianhydride is completely dissolved, if the 3,3'4,4-diphenyl methyl ether tetra-acid dianhydride is not completely dissolved within 5min , then increase the system temperature to 30-35°C or increase the stirring speed to 280r / min and continue to stir until the aromatic dianhydride 3,3'4,4-diphenylmethyl ether tetraacid dianhydride is completely dissolved to obtain the reaction solution I;

[0022] S2. Adjust the temperature of the reaction solution I to 38°C, and add 1,10-diaminodecane to the reaction solution I at a rate of 2g / min, and ...

Embodiment 2

[0025] A kind of high-performance polyimide preparation method proposed by the present invention and its application in lithium battery electrode comprise the following steps:

[0026] S1. Weigh 3,3',4,4'-biphenyltetracarboxylic dianhydride and place it in the reaction flask, and then inject nitrogen gas into the reaction flask for 0min, then add N-methylpyrrolidone at 150r / min Stir at a high speed until the aromatic dianhydride 3,3',4,4'-biphenyltetracarboxylic dianhydride and pyromellitic anhydride are completely dissolved, if 3,3',4,4'-biphenyltetracarboxylic acid If the dianhydride is not completely dissolved within 5 minutes, raise the temperature of the system to 30-35°C or increase the stirring speed to 300r / min and continue stirring until the 3,3',4,4'-biphenyltetracarboxylic dianhydride is completely dissolved , to obtain reaction solution I;

[0027] S2. Adjust the temperature of the reaction solution I to 40°C, and add 1,10-diaminodecane to the reaction solution I ...

Embodiment 3

[0030] A kind of high-performance polyimide preparation method proposed by the present invention and its application in lithium battery electrode comprise the following steps:

[0031] S1. Weigh 3,3'4,4-diphenylmethyl ether tetra-acid dianhydride, place it in a reaction flask, and pass nitrogen gas into the reaction flask for 40 minutes, then add N,N-dimethylacetamide, Stir at a speed of 100r / min until the 3,3'4,4-diphenylmethyl ether tetra-acid dianhydride is dissolved. If the 3,3'4,4-diphenyl methyl ether tetra-acid dianhydride is not completely dissolved within 5 minutes, Then raise the temperature of the system to 35°C or increase the stirring speed to 300r / min and continue to stir until the 3,3'4,4-diphenylmethyl ether tetra-acid dianhydride is completely dissolved to obtain the reaction solution I;

[0032] S2. Adjust the temperature of the reaction solution I to 38°C, and add p-phenylenediamine to the reaction solution I at a rate of 2 g / min. After the addition of p-phe...

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Abstract

The invention provides a preparation method of high-performance polyimide and application of the high-performance polyimide in a lithium battery electrode. The preparation method comprises the following steps: S1, weighing aromatic dianhydride, adding the aromatic dianhydride into a reaction bottle, feeding nitrogen into the reaction bottle for 20-40 minutes, adding an aprotic solvent, and stirring the mixture at a speed of 100-200 r / min until the aromatic dianhydride is completely dissolved to prepare a reaction solution I; and S2, adjusting the temperature of the reaction solution I to 38-45DEG C, adding diamine into the reaction solution I at 2-4 g / min, maintaining the temperature at 35-45 DEG C after the diamine is added and continuously stirring the reaction solution for 5-8 days toobtain the high-performance polyimide. The preparation method is simple to operate, convenient to use and rich in raw material source. The high-performance polyimide is good in operability, excellentin electrochemical performance and mechanical performance and good in corrosion resistance, electrolyte resistance and bending resistance.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a preparation method of high-performance polyimide and its application in lithium battery electrodes. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, notebook computers, etc. on portable electronics. Binder is one of the essential materials in lithium-ion batteries. It has the function of binding electrodes and maintaining active materials, and can enhance the electronic contact between electrode active materials and conductive agents as well as active materials and current collectors. To stabilize the structure of the pole piece. At present, the binder used in industry is mainly polyvinylidene fluoride (PVDF), but PVDF is a crystalline polymer, and its crystallinity is generally about 50%. The existing crystalline molecules are difficult to circulate, resulting in increased charge and discharge loads. In addition, the mechanical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10H01M4/62H01M10/052
CPCC08G73/1082H01M4/622H01M10/052Y02E60/10
Inventor 王泽伟王桂荣
Owner 汕头市鲁汕化工原料有限公司
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