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

A coating film and paste technology, which is applied to battery components, circuits, electrical components, etc., can solve problems such as imperfect microcrystalline structure, low crystallinity, and large internal resistance of the battery

Active Publication Date: 2019-06-07
WUXI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a battery coating film slurry, a battery separator, and a secondary battery and their respective preparations to solve the problem of 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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Effect test

Embodiment 1

[0087] A preparation method of battery coating film slurry, comprising the steps of:

[0088] 1. Provide polymers;

[0089] 2. Provide organic-inorganic hybrid nucleating agents;

[0090] 3. Provide inorganic fillers;

[0091] 4. Prepare battery coating film slurry based on the materials provided above.

[0092] The polymer in step 1 is a fluoropolymer;

[0093] The fluorine-containing polymer is polyvinylidene fluoride.

[0094] The organic-inorganic hybrid nucleating agent is a phenyl polysiloxane hybrid nucleating agent.

[0095] The preparation method of phenyl polysiloxane hybrid nucleating agent, its concrete steps are:

[0096] (1) Dissolve benzoic acid in ice water to form a solution, add 3-aminopropyltriethoxysilane and ultrasonically dissolve it in a low temperature environment for 0.5 to 1 hour.

[0097] The various materials are counted in parts by mass, the parts by mass of benzoic acid are 5 parts by mass, and the parts by mass of ice water are 75 parts by ...

Embodiment 2

[0162] A preparation method of battery coating film slurry, comprising the steps of:

[0163] 1. Provide polymers;

[0164] 2. Provide organic-inorganic hybrid nucleating agents;

[0165] 3. Provide inorganic fillers;

[0166] 4. Prepare battery coating film slurry based on the materials provided above.

[0167] The polymer in step one is a fluoropolymer.

[0168] The fluorine-containing polymer is polyvinylidene fluoride.

[0169] The organic-inorganic hybrid nucleating agent is a long-chain alkylpolysiloxane hybrid nucleating agent.

[0170] The preparation method of long-chain alkyl polysiloxane hybrid nucleating agent, its specific steps are:

[0171] (1) Dissolve octadecyldimethylphosphoric acid directly in water to form a solution, add 3-glyceroloxypropyltrimethoxysilane and ultrasonically dissolve it in a low temperature environment for 0.5 to 1 hour.

[0172] Various materials are calculated according to mass parts, and the mass parts of octadecyl dimethyl phosph...

Embodiment 3

[0186] The invention provides a method for preparing battery coating film slurry, comprising the following steps:

[0187]1. Provide polymers;

[0188] 2. Provide organic-inorganic hybrid nucleating agents;

[0189] 3. Provide inorganic fillers;

[0190] 4. Prepare battery coating film slurry based on the materials provided above.

[0191] The polymer in step 1 is a fluoropolymer;

[0192] The fluorine-containing polymer is a copolymer based on vinylidene fluoride and methyl acrylate, wherein the mass fraction of vinylidene fluoride is 85%;

[0193] The organic-inorganic hybrid nucleating agent is a phenyl polysiloxane hybrid nucleating agent;

[0194] The preparation method of phenyl polysiloxane hybrid nucleating agent, its concrete steps are:

[0195] (1) Dissolve benzoic acid in ice water to make a solution, add 3-aminopropyltriethoxysilane and ultrasonically dissolve it in a low temperature environment for 0.5 to 1 hour;

[0196] Various materials are counted accord...

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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, the polymer including polyvinylidene fluoride and a fluorine-containing polymer; providing a nucleating agent; combining the polymer with the nucleating agent to obtain a slurry polymer; and preparing the battery coating film slurry based on the slurry 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.

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): H01M2/14H01M2/16H01M50/403H01M50/446H01M50/449
CPCH01M50/403H01M50/446Y02E60/10
Inventor 程跃蒋仙友陈永乐
Owner WUXI ENERGY NEW MATERIALS TECH CO LTD
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