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Battery coating film slurry, battery separator, secondary battery and preparation method thereof

A technology of coating film and slurry, which is applied in the field of battery separator, secondary battery and its preparation, and battery coating film slurry field, can solve the problem of low adhesion performance of separator, imperfect crystallite structure, large internal resistance of battery, etc. problems, to achieve the effect of perfect crystalline structure, excellent bonding performance and small swelling ratio

Active Publication Date: 2021-09-28
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of battery coating film slurry, battery diaphragm and secondary battery and respective preparation, be used to solve polyvinylidene fluoride (PVDF) in the prior art The microcrystalline structure of the copolymer is imperfect and the crystal form is mainly non-polar crystal form with poor resistance to organic solvents. The degree of crystallinity is low, the swelling ratio is relatively large, and the obtained separator has low adhesion performance, resulting in a large internal resistance of the battery. Problems such as poor cycle performance

Method used

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  • Battery coating film slurry, battery separator, secondary battery and preparation method thereof
  • Battery coating film slurry, battery separator, secondary battery and preparation method thereof
  • Battery coating film slurry, battery separator, secondary battery and preparation method thereof

Examples

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Embodiment 1

[0101] A preparation method of battery coating film slurry, comprising the steps of:

[0102] 1. Provide modified polymers;

[0103] 2. Provide inorganic fillers;

[0104] 3. Prepare battery coating film slurry based on the materials provided above.

[0105] The technological process of preparation method sees appendix figure 1 .

[0106] The modified polymer preparation method of step 1, its specific steps are:

[0107] (1) Hexadecyldimethylphosphoric acid was dissolved in ice water to prepare a solution, and anilinomethyltriethoxysilane was added and ultrasonically dissolved at 5°C for 0.5-1 hour.

[0108] Various materials are counted according to mass parts, and the mass parts of cetyl dimethyl phosphoric acid is 5 parts, and the mass parts of ice water is 75 parts, and the feeding amount of anilinomethyltriethoxysilane is the same as that of hexadecane The molar weight of base dimethyl phosphoric acid is the same;

[0109] (2) Stir in the solution obtained in step (...

Embodiment 2

[0175] A preparation method of battery coating film slurry, comprising the steps of:

[0176] 1. Provide modified polymers;

[0177] 2. Provide inorganic fillers;

[0178] 3. Prepare battery coating film slurry based on the materials provided above.

[0179] The modified polymer preparation method of step 1, its specific steps are:

[0180] (1) Diethyl octadecyl phosphate was dissolved in ice water to form a solution, and anilinomethyltriethoxysilane was added and ultrasonically dissolved at 5°C for 0.5-1 hour.

[0181] Various materials are counted according to the mass parts, the mass parts of octadecyl diethyl phosphate is 5 parts, the mass parts of ice water is 75 parts, the feeding amount of anilinomethyltriethoxysilane and octadecyl Diethyl phosphate has the same molar mass

[0182] (2) Stir in the solution obtained in step (1), and add 2 to 3 drops of tertiary amine catalysts to promote the hydrolysis and condensation of anilinomethyltriethoxysilane. After hydrolysi...

Embodiment 3

[0198] The invention provides a method for preparing battery coating film slurry, comprising the following steps:

[0199] 1. Provide modified polymers;

[0200] 2. Provide inorganic fillers;

[0201] 3. Prepare battery coating film slurry based on the materials provided above.

[0202] The modified polymer preparation method of step 1, its specific steps are:

[0203] (1) Hexadecyldimethylphosphoric acid was dissolved in ice water to prepare a solution, and anilinomethyltriethoxysilane was added and ultrasonically dissolved at 5°C for 0.5-1 hour.

[0204] Various materials are calculated according to the mass parts, the mass parts of cetyl dimethyl phosphoric acid is 10 parts, the mass parts of ice water is 100 parts, the feeding amount of anilinomethyltriethoxysilane is the same as that of cetyl The same molar amount of dimethylphosphoric acid

[0205] (2) Stir in the solution obtained in step (1), and add 2 to 3 drops of tertiary amine catalysts to promote the hydrolysi...

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Abstract

The invention provides a battery coating film slurry, a battery separator, a secondary battery and their respective preparation methods. The preparation of the battery coating film slurry includes: providing a polymer unit, the polymer unit comprising vinylidene fluoride and a fluorine-containing polymer unit , providing a nucleating agent, adding the nucleating agent during the polymerization of the polymerization unit to obtain a modified polymer; and preparing the battery coating film slurry based on the modified polymer. Through the above technical solution, the present invention designs the battery coating film slurry, and adopts a non-aqueous system, which can not only bond the diaphragm and the pole piece together, improve the hardness of the battery, but also the crystal form of the polymer prepared Polar crystal transformation, more complete crystal structure and higher crystallinity, smaller swelling ratio, better bonding performance; the manufactured battery has smaller internal resistance and better cycle performance. The water-based system is used to disperse the polymer, which solves the shortcomings of the oil-based system for preparing copolymers, gives full play to the advantages of water-based polymer coating products, and further improves the environmental protection effect.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a battery coating film slurry, a battery diaphragm, a secondary battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are usually mainly composed of positive electrodes, negative electrodes, separators, electrolytes, and battery casings. In the lithium-ion battery structure, the separator is one of the key inner components. The main function of the diaphragm is to separate the positive and negative electrodes of the battery, prevent the positive and negative electrodes from being directly contacted and short circuit, and at the same time enable the electrolyte ions to pass smoothly during the charging and discharging process of the battery, forming a current, and abnormality occurs when the battery operating temperature When it rises, the migration channel of electrolyte ions is closed, and the current is cut off to e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/40H01M50/403
CPCH01M50/40H01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 程跃蒋仙友陈永乐
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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