Diaphragm material used for lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and diaphragm materials, which is applied in the field of diaphragm materials for lithium-ion batteries and its preparation, and can solve the problems of easily damaged ceramic coated diaphragms, low thermal shrinkage rate of diaphragms, and poor impact resistance, etc.

Inactive Publication Date: 2019-03-26
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It alleviates the defects of the traditional diaphragm base material that is not resistant to high temperature and the ceramic coated diaphragm is easily damaged. The coated diaphragm has good electrochemical properties and mechanical properties, and the diaphragm has a low thermal shrinkage rate, which is suitable for high-rate charge and discharge. , its impact resistance is poor, and it cannot better buffer the physical impact of the battery in the event of a car collision

Method used

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  • Diaphragm material used for lithium ion battery and preparation method thereof
  • Diaphragm material used for lithium ion battery and preparation method thereof
  • Diaphragm material used for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0041] A diaphragm material for a lithium ion battery, the diaphragm material comprises by weight:

[0042]

[0043] The preparation method of separator material for lithium ion battery is as follows:

[0044] Put acetone and polyvinylidene fluoride into the planetary mixer in proportion, and mix and stir for 180 minutes at a stirring revolution speed of 15 r / min, a dispersion speed of 1500 r / min, and a temperature of 40°C to obtain a mixture a;

[0045] Add dibutyl phthalate to mixture a, stir at a stirring revolution speed of 20 r / min, a dispersion speed of 1500 r / min, and a temperature of 40°C for 30 minutes to obtain mixture b;

[0046] Add dimethylacetamide to mixture b, stir at a stirring revolution speed of 20 r / min, a dispersion speed of 1500 r / min, and a temperature of 40°C for 45 minutes to obtain mixture c;

[0047] Add SiO2 to the mixture c, stir at a stirring revolution speed of 20r / min, a dispersion speed of 1800r / min, a temperature of 30°C, a stirring vacuum...

specific Embodiment 2

[0049] A diaphragm material for a lithium ion battery, the diaphragm material comprises by weight:

[0050]

[0051] The preparation method of separator material for lithium ion battery is as follows:

[0052] Put acetone and polyvinylidene fluoride into the planetary mixer in proportion, and mix and stir for 240 minutes at a stirring revolution speed of 20r / min, a dispersion speed of 2400r / min, and a temperature of 40°C to obtain a mixture a;

[0053] Add dibutyl phthalate to mixture a, stir at a stirring revolution speed of 15 r / min, a dispersion speed of 1500 r / min, and a temperature of 50°C for 45 minutes to obtain mixture b;

[0054] Add dimethylacetamide to mixture b, stir at a stirring revolution speed of 15 r / min, a dispersion speed of 1500 r / min, and a temperature of 30°C for 30 minutes to obtain mixture c;

[0055] Add SiO2 to mixture c, stir at a revolution speed of 20r / min, a dispersion speed of 2400r / min, a temperature of 40°C, a stirring vacuum of 0.095MPa, a...

specific Embodiment 3

[0057] A diaphragm material for a lithium ion battery, the diaphragm material comprises by weight:

[0058]

[0059] The preparation method of separator material for lithium ion battery is as follows:

[0060] Put ethanol and sodium carboxymethylcellulose into a planetary mixer in proportion, mix and stir for 190 minutes at a stirring revolution speed of 15 r / min, a dispersion speed of 1700 r / min, and a temperature of 41° C. to obtain a mixture a;

[0061] Add dicyclohexyl phthalate to mixture a, stir at a stirring revolution speed of 17 r / min, a dispersion speed of 1700 r / min, and a temperature of 30°C for 35 minutes to obtain mixture b;

[0062] Add triethanolamine to mixture b, stir at a stirring revolution speed of 18 r / min, a dispersion speed of 1800 r / min, and a temperature of 50°C for 35 minutes to obtain mixture c;

[0063] Add alumina to mixture c, stir at a stirring revolution speed of 25 r / min, a dispersion speed of 1900 r / min, a temperature of 32°C, a stirring ...

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PUM

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Abstract

The invention relates to the field of lithium ion batteries, and discloses a diaphragm material used for a lithium ion battery and a preparation method thereof. The diaphragm material contains the following components in parts by weight: 92-97 parts of base material, 3-8 parts of binder, 2-4 parts of pore forming agent, 2-4 parts of complexing agent, and 90-110 parts of solvent. The diaphragm material has good stretching resistant property, and good liquid locking and impact resistant capabilities, and can prevent outbreak of fire caused by short circuit of the battery due to physical impact extrusion when being applied to a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a separator material for lithium ion batteries and a preparation method thereof. Background technique [0002] The separator used in traditional lithium-ion batteries is single-layer PP, PE, or PP+PE+PP three-layer composite and then coated with ceramic coating. Punch out the corresponding depth and then install the battery cells for top and side sealing. After high-temperature vacuum baking, the electrolyte is injected. Due to the existence of free electrolyte, when the battery module encounters a collision accident on the car, it is very easy to cause a battery short circuit and fire. [0003] CN201810169305.3 discloses a lithium-ion battery diaphragm and a preparation method thereof. The method is as follows: uniformly coating cyclodextrin polymer slurry on a PP / PE / PP porous film substrate to form a cyclodextrin polymer layer , after drying, the lithium ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/446
CPCH01M10/0525H01M50/403H01M50/446Y02E60/10
Inventor 梁凯陈小平
Owner 桑顿新能源科技(长沙)有限公司
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