Battery-used separator and preparation method thereof

A diaphragm and battery technology, applied in the field of battery diaphragm and its preparation, can solve the problems of reducing the cycle life of the battery and the diaphragm is prone to plugging, and achieve the effects of reducing the risk of plugging, not endangering human health, and low production costs

Inactive Publication Date: 2019-06-07
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The battery separator improves the hardness of the winding core and the effective use space of the battery, but the separator is prone to clogging during the charging and discharging process of the battery, which will reduce the cycle life of the battery

Method used

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  • Battery-used separator and preparation method thereof
  • Battery-used separator and preparation method thereof
  • Battery-used separator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] A method for preparing a battery diaphragm includes the following steps:

[0083] (1) Mix 35wt% alumina, 2wt% triethyl phosphate and 57.4wt% deionized water in proportion, stir for 1500r / min and mix for 2h, then add 5wt% polymethyl methacrylate, stir for 1500r / min and mix for 2h , Finally add 0.6wt% sodium dodecylbenzene sulfonate, stir 1500r / min and mix for 2h to prepare ceramic slurry, mix 25wt% polyvinylidene fluoride, 2wt% triethyl phosphate and 67.4wt% deionized water Proportional mixing, stirring 1500r / min for 2h, then adding 5wt% polymethyl methacrylate, stirring for 3h and mixing uniformly, and finally adding 0.6wt% sodium dodecylbenzene sulfonate, stirring for 1500r / min and mixing for 2h to prepare polymer Slurry

[0084] (2) After coating ceramic slurry on both sides of the PP film with anilox rollers, air spray the polymer slurry directly on both sides of the ceramic diaphragm. The coating area of ​​the polymer slurry accounts for the total area of ​​the base fil...

Embodiment 2

[0087] A method for preparing a battery diaphragm includes the following steps:

[0088] (1) Mix 50wt% boehmite, 5% polyethylene glycol and 41.9% deionized water in proportion, stir at 2000r / min for 1h, then add 3wt% polybutyl methacrylate, stir at 2000r / min for 1h, Finally, add 0.1wt% sodium lauryl sulfate, stir at 2000r / min and mix for 1h to prepare ceramic slurry. Mix 10wt% polyvinylidene fluoride-trifluoroethylene, 0.1wt% polyethylene glycol and 78.8wt% deionized water Mix in proportion, stir 500r / min for 5h, then add 10wt% polybutyl methacrylate, stir for 5h and mix uniformly, finally add 1wt% sodium lauryl sulfate, stir for 500r / min and mix for 5h to prepare polymer slurry ;

[0089] (2) After coating ceramic slurry on both sides of the PP film with anilox rollers, air spray the polymer slurry directly on both sides of the ceramic diaphragm. The coating area of ​​the polymer slurry accounts for the total area of ​​the base film. The percentage is 10%. After drying at 60°C, ...

Embodiment 3

[0091] A method for preparing a battery diaphragm includes the following steps:

[0092] (1) Mix 20wt% zinc oxide, 0.1wt% ammonium polyacrylate and 68.9wt% deionized water in proportion, stir 500r / min for 5h, then add 10wt% styrene butadiene latex, stir 500r / min for 5h, and finally add 1wt% sodium butyl naphthalene sulfonate, stir 500r / min for 5h to prepare ceramic slurry, mix 50wt% polyvinylidene fluoride-hexafluoroethylene, 5wt% ammonium polyacrylate and 43.9wt% deionized water in proportion, Stir at 2000r / min for 1h, then add 1wt% styrene-butadiene latex, stir for 1h and mix uniformly, finally add 0.1wt% sodium butyl naphthalene sulfonate, stir at 2000r / min for 1h to prepare polymer slurry;

[0093] (2) After coating ceramic slurry on both sides of the PE film with anilox rollers, air spray the polymer slurry directly on both sides of the ceramic diaphragm. The coating area of ​​the polymer slurry accounts for the total area of ​​the base film. The percentage is 50%, and the co...

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Abstract

The invention relates to a battery-used separator and a preparation method thereof. The separator comprises a base film; one side of the base film is sequentially provided with a first ceramic coatinglayer and a first polymer coating layer; the other side of the base film is sequentially provided with a second ceramic coating layer and a second polymer coating layer; or, the other side of the base film is only provided with a second polymer coating layer; and the coverage area of the first polymer coating layer and the second polymer coating layer is 10% to 50% of the total area of the base film. A non-full coverage coating polymer coating layer is adopted, and in comparison with a full coverage coating polymer coating layer in the prior art, the risk of separator hole blocking can be reduced by adopting the non-full coverage coating, and the cycle stability of the material is improved. Besides, baking is carried out after coating of a waterborne ceramic coating and a polymer coatingis completed sequentially, and through using the same type of binder, the coating interface between the waterborne ceramic coating and the polymer coating is eliminated, and a product with stronger binding between the coatings can be obtained.

Description

Technical field [0001] The invention belongs to the field of battery diaphragms, and specifically relates to a battery diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in electronic communications, energy storage and power supplies. They are mainly composed of positive electrode, negative electrode, electrolyte and battery separator. Although the separator does not participate in the electrochemical reaction in the battery, it is the key to the lithium-ion battery. Inner components. The key performances such as battery capacity, cycle performance and charge-discharge current density are directly related to the diaphragm. The improvement of diaphragm performance plays an important role in improving the overall performance of lithium-ion batteries. [0003] The safety of lithium-ion batteries has always been the focus of the industry, and the safety of the separator is the top priority among them, which requires the sepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCY02E60/10
Inventor 姜倩荣杨师郭红祥王磊吕正中刘金成
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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