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Water-based aramid fiber coating liquid, preparation method thereof, lithium ion battery and diaphragm of lithium ion battery

A lithium-ion battery and coating liquid technology, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of poor bonding force between the coating and the base film, difficulty in controlling the uniformity of pores, etc., and achieve enhanced adhesion Junction effect, excellent battery performance, uniform coating effect

Active Publication Date: 2020-02-28
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a water-based aramid fiber coating solution, a lithium ion battery diaphragm and a lithium ion battery to solve or partially solve the poor bonding force between the coating formed by the aramid fiber coating slurry and the base film, and the control of the uniformity of the pores. Difficult Technical Problems Technical Problems

Method used

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  • Water-based aramid fiber coating liquid, preparation method thereof, lithium ion battery and diaphragm of lithium ion battery
  • Water-based aramid fiber coating liquid, preparation method thereof, lithium ion battery and diaphragm of lithium ion battery
  • Water-based aramid fiber coating liquid, preparation method thereof, lithium ion battery and diaphragm of lithium ion battery

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preparation example Construction

[0052] Based on the same inventive concept of the foregoing embodiments, in some optional embodiments, a method for preparing the water-based aramid coating solution without adding the silane solution in the foregoing embodiments is provided, specifically comprising the following steps:

[0053] Take 100 parts by mass of aramid nanofiber aqueous dispersion solution, add 0.25-3 parts by mass of adhesive, 0.2-3 parts by mass of lubricant, 0.1-3 parts by mass of active agent, and 0.3-5 parts by mass of pore-forming agent , after stirring for 0.5 hours to 2 hours in the temperature range of 15° C. to 50° C., the water-based aramid fiber coating liquid is obtained.

[0054] Based on the same inventive concept of the foregoing embodiments, in some optional embodiments, a method for preparing the water-based aramid coating solution added with the silane solution in the foregoing embodiments is provided, specifically comprising the following steps:

[0055] Take 100 parts by mass of t...

Embodiment 1

[0064] Embodiment 1: the solid content after getting 100ml homogeneous is that the aramid fiber aqueous dispersion of 0.5wt% is in the flask, adds the silane solution that contains 0.3ml TEOS (tetraethyl orthosilicate), 3ml NH H O (pure After diluting ammonia water and deionized water at a volume ratio of 1:3), stir at room temperature (25°C) for 12 hours, then add 0.5g of acrylic binder, 0.75g of surfactant, and 2ml of pore-forming agent butanol in sequence. Stir at room temperature for 0.5h, then scrape-coat on the surface of a 9μm PE base film, and dry at 70°C to obtain an aramid-coated composite separator.

Embodiment 2

[0065]Example 2: Take 100ml homogeneous 0.5wt% aramid aqueous dispersion in a flask, add silane solution containing 0.5ml TEOS, 3ml NH3 H2O (dilute pure ammonia water and deionized water at a volume ratio of 1:3 ), stirred at room temperature (25° C.) for 12 h, and then added 0.5 g of acrylic binder, 0.75 g of surfactant, and 2 ml of pore-forming agent butanol in sequence. Stir at room temperature for 0.5h, then scrape-coat on the surface of 9μm PE base film, and dry at 70°C to obtain aramid-coated composite separator. With the addition of TEOS, the air permeability of the separator increases.

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Abstract

The invention discloses a water-based aramid fiber coating liquid, and belongs to the technical field of lithium ion battery. The water-based aramid fiber coating liquid comprises the following components in parts by mass: 100 parts of an aramid nano-fiber water-based dispersion solution, 0.25-3 parts of an adhesive, 0.2-3 parts of a wetting agent, 0.1-3 parts of an active agent and 0.3-5 parts ofa pore-forming agent, wherein the mass solid content of the aramid nano-fiber water-based dispersion solution is 0.2%-15%; the adhesive comprises at least one of the following components: an acrylicacid component, a polyurethane component, a polyimide polymer and carboxymethyl cellulose. The lithium ion battery diaphragm prepared by coating the water-based aramid fiber coating liquid has the characteristics of uniform coating, and good pore-forming uniformity; bonding treatment of a coating layer and a base membrane is excellent, the diaphragm possesses good wettability and good thermal stability, so that the excellent battery performance of the lithium ion battery is ensured.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a water-based aramid coating solution, a lithium-ion battery diaphragm and a lithium-ion battery. Background technique [0002] With the development of new energy vehicle technology, lithium-ion batteries have attracted widespread attention due to their advantages such as high energy density and long cycle life. However, lithium-ion battery safety accidents that occur from time to time are embarrassing. Among them, the diaphragm is one of the important components of the lithium-ion battery. Although it does not provide energy, it plays an important role in the safety performance of the battery. The diaphragm separates the positive and negative electrodes of the battery to prevent direct contact between the positive and negative electrodes and short circuit, and can It provides lithium ion transmission channels and isolates electron transmission. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D177/10C09D7/63C09D7/65C08J7/04H01M2/14H01M2/16H01M10/0525C08L23/02
CPCC09D177/10C09D7/63C09D7/65H01M10/0525C08L2205/035C08L2201/08C08J2323/02C08J2477/10H01M50/403H01M50/411H01M50/44H01M50/449C08L33/04C08L75/04C08L79/08C08L1/286C08K13/02C08K5/10C08K5/05Y02E60/10
Inventor 施利毅袁帅王庆同王竹仪曹煜彤张浩徐霭莹朱俊强
Owner SHANGHAI UNIV
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