Water-based high-viscosity glued diaphragm, preparation method thereof, and application of diaphragm in battery

A high-viscosity, glue-coating technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of accelerated cycle life attenuation, neglect, and increase in internal resistance of cells, to improve cycle life and safety performance, The best shaping effect and the effect of improving adhesion

Pending Publication Date: 2020-05-08
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method has the following deficiencies: ①A higher mass fraction of the adhesive polymer will increase the thickness of the coating on one side, which will affect the design of the cell and increase the risk of blocking holes in the diaphragm, so that the inner core of the cell will be damaged. Increased resistance, faster attenuation of cycle life, and even battery safety problems due to plugging of positive electrodes caused by side lithium precipitation; ②According to the difference in adhesion between the positive and negative electrodes and the rubberized separator, a rubberized separator with different coatings on both sides is designed, but not Consider the changes in the adhesion between the separator coating and the positive and negative electrodes after hot pressing, and before and after soaking in the electrolyte

Method used

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  • Water-based high-viscosity glued diaphragm, preparation method thereof, and application of diaphragm in battery
  • Water-based high-viscosity glued diaphragm, preparation method thereof, and application of diaphragm in battery
  • Water-based high-viscosity glued diaphragm, preparation method thereof, and application of diaphragm in battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Preparation of slurry:

[0059] Add 75g of alumina ceramic powder, 10g of polyethylene glycol, and 10g of polytetrafluoroethylene to deionized water in sequence, disperse at high speed for 2 hours, and finally add 5g of sodium dodecylbenzenesulfonate, disperse at high speed for 3 hours to obtain a solid content of 60wt% water-based ceramic slurry;

[0060] Add 80 g of polytetrafluoroethylene, 15 g of triethyl phosphate and 5 g of sodium dodecylbenzenesulfonate to deionized water in sequence, and disperse at high speed for 3 hours to obtain an aqueous polymer slurry C with a solid content of 30 wt %;

[0061] Add 80 g of pure benzene latex powder, 15 g of triethyl phosphate, and 5 g of sodium dodecylbenzenesulfonate to deionized water, disperse at high speed for 3 hours, and obtain an aqueous polymer slurry D with a solid content of 30 wt % after dispersing evenly;

[0062] (2) Coating: apply the above-mentioned ceramic slurry on the positive electrode side of the 1...

Embodiment 2

[0067] (1) Preparation of slurry:

[0068] Add 90g of boehmite ceramic powder, 4g of polyvinylpyrrolidone and 5g of polyvinylidene fluoride-trifluoroethylene in sequence to deionized water, disperse at high speed for 5 hours, and finally add 1g of octylphenol polyoxyethylene ether, disperse at high speed for 1 hour to obtain 30wt The aqueous ceramic slurry of % solid content;

[0069] 90 g of polyvinylidene fluoride-trifluoroethylene, 9 g of polyvinylpyrrolidone and 1 g of octylphenol polyoxyethylene ether were sequentially added to deionized water, and dispersed at high speed for 1 hour to obtain an aqueous polymer slurry C with a solid content of 10 wt %;

[0070] Add 75g of polyacrylonitrile, 15g of triethyl phosphate, and 10g of sodium dodecylbenzenesulfonate to deionized water, disperse at high speed for 3 hours, and finally add, disperse at high speed for 1 hour, and obtain a water-based polymer slurry with a solid content of 10wt% after dispersing evenly Material D;

...

Embodiment 3

[0074] (1) Preparation of slurry:

[0075] Add 85g of titanium dioxide powder, 8g of laurate, and 4g of vinylidene fluoride-hexafluoropropylene polymer to deionized water in sequence, and disperse at high speed for 5 hours. content of water-based ceramic slurry;

[0076] Add 75 g of vinylidene fluoride-hexafluoropropylene polymer, 15 g of laurate and 10 g of polyether siloxane copolymer to deionized water in sequence, and disperse at high speed for 1 hour to obtain an aqueous polymer slurry C with a solid content of 20 wt %;

[0077] Add 90 g of polybutyl methacrylate powder, 9 g of laurate and 1 g of polyether siloxane copolymer to deionized water, disperse at high speed for 3 hours, and obtain an aqueous polymer slurry D with a solid content of 20 wt % after dispersing evenly;

[0078] (2) Coating: apply the above-mentioned ceramic slurry on the positive electrode side of the 8 μm base film by extrusion, the coating speed is 60 m / min, pass through the transfer roller, and d...

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Abstract

The invention relates to a water-based high-viscosity glued diaphragm, a preparation method thereof and an application of the diaphragm in a battery. The water-based high-viscosity glued diaphragm comprises a base membrane, and a positive polymer layer and a negative polymer layer which are respectively arranged at two sides of the base membrane, wherein a positive ceramic layer is arranged between the base membrane and the positive polymer layer, and/or a negative ceramic layer is arranged between the base membrane and the negative polymer layer; a binder in the positive polymer layer and a battery positive electrode piece is the same type of binder, and a binder in the negative polymer layer and a battery negative electrode piece is the same type of binder. The diaphragm disclosed by theinvention has the characteristics of small coating amount of coatings on two sides, light and thin coatings, high cohesiveness and the like, so the shaping effect of a battery cell is optimal, and module boxing is facilitated; meanwhile, a module limiting effect is achieved. Moreover, the risk of hole blockage of the diaphragm is low, so the internal resistance of the battery cell is stable and controllable, the lithium precipitation risk is reduced, and the cycle life and safety performance of the battery cell are ensured.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a water-based high-viscosity rubber-coated diaphragm, a preparation method thereof and an application in batteries. Background technique [0002] In the battery, the main function of the separator is to ensure the effective isolation between the positive and negative plates, and has a certain mechanical strength, so as to ensure that the battery does not rupture under deformation conditions; the performance of the separator directly affects the cycle life and dynamic characteristics of the battery, etc. Various properties, and its surface is modified to obtain a rubber-coated separator, which can effectively improve the safety of the battery. Adhesive-coated separators can improve the battery negative electrode interface and cycle performance, and become one of the current research hotspots. The surface of the ceramic diaphragm is modified and modified with a water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14
CPCH01M50/431H01M50/403H01M50/411Y02E60/10
Inventor 杨师王磊姜倩荣赵红燕洪玉吕正中刘金成
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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