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Mixed slurry for preparing composite diaphragm and preparation method of composite diaphragm

A technology of composite diaphragm and mixed slurry, which is applied in nanotechnology, structural parts, electrical components, etc. for materials and surface science, and can solve problems such as unfavorable battery processing and transportation, low adhesion, and poor adhesion , to achieve the effects of excellent electrolyte absorption and retention capacity, enhanced adhesion, and improved tensile strength

Active Publication Date: 2020-05-12
JIANGSU QINGTAO ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bonding force between the fiber rod material and the polyolefin material is poor, and the bonding force between the attapulgite nano-ceramic fiber separator and the lithium-ion battery pole piece is very low, which is not conducive to the processing and transportation of the battery.

Method used

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  • Mixed slurry for preparing composite diaphragm and preparation method of composite diaphragm
  • Mixed slurry for preparing composite diaphragm and preparation method of composite diaphragm
  • Mixed slurry for preparing composite diaphragm and preparation method of composite diaphragm

Examples

Experimental program
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preparation example Construction

[0028] A method for preparing a composite diaphragm, comprising the following steps: step S1) preparing the mixed slurry; the step S1) comprising the following steps: step S11) dissolving the attapulgite nano-ceramic fiber and a dispersant in a solvent , and fully stirred; step S12) adding nano glue, binder and surfactant to the solution in step S11), and fully mixing and stirring to prepare the mixed slurry.

[0029] Step S2) coating the mixed slurry on the surface of the porous polymer membrane to form a separator layer of nano glue and attapulgite nano ceramic fibers. In the present invention, coating may be performed on both sides of the porous polymer membrane, or may be applied on one side of the porous polymer membrane. The porous polymer film is a polyethylene base film, a polypropylene base film, a polypropylene / polyethylene / polypropylene composite base film, a polyimide base film, a nano glue base film, a polyethylene non-woven fabric base film, a poly One of acryli...

Embodiment 1

[0031] Example 1, this example is a common method for preparing a diaphragm, an alumina particle diaphragm.

[0032] 20g of alumina particles, 0.6g of sodium carboxymethylcellulose and 40g of deionized water were stirred in a high-speed disperser at a speed of 3000 rpm for 1 hour. 0.5 g of fluoroalkyl methoxy ether alcohol, 0.4 g of sodium carboxymethylcellulose, 3 g of polyacrylate and 16 g of deionized water were added again, and stirred for 3 h at a speed of 2000 rpm. The resulting slurry was coated on one side with a micro-gravure coater on a polyethylene film with a thickness of 12 microns, and dried at 60°C to obtain a composite separator of alumina particles with a total thickness of 16 microns, marked as S1.

Embodiment 2

[0033] Embodiment 2, this embodiment is the preparation method of the composite membrane of nano glue and alumina particles.

[0034]20g of alumina particles, 0.6g of sodium carboxymethylcellulose and 40g of deionized water were stirred in a high-speed disperser at a speed of 3000 rpm for 1 hour. Add 10g of nano glue emulsion, 0.5g of fluoroalkyl methoxy ether alcohol, 0.4g of sodium carboxymethylcellulose, 3g of polyacrylate and 16g of deionized water again, and stir for 3 hours at 2000 rpm. The resulting slurry was coated on one side with a micro-gravure coater on a polyethylene film with a thickness of 12 microns, and dried at 60°C to obtain a composite separator of nano-glue and alumina particles with a total thickness of 16 microns, marked as S2 .

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Abstract

The invention discloses a mixed slurry for preparing a composite diaphragm, which comprises nano glue, 5%-45%; attapulgite nano-ceramic fiber, 5%-45%; binder, 1.5%-5%; Dispersant, 0.5%‑1.5%; Surfactant, 0.1%‑0.5%, Solvent, balance. The invention also discloses a preparation method of the composite diaphragm.

Description

technical field [0001] The invention relates to the fields of lithium batteries and the like, in particular to a mixed slurry for preparing a composite diaphragm and a preparation method for the composite diaphragm. Background technique [0002] Due to its high energy density and long cycle life, lithium-ion batteries are becoming a research hotspot in new power supply technologies. Lithium-ion batteries have been widely used in many fields such as digital electronic products and new energy vehicles, and are internationally recognized as a new energy carrier with great application prospects and market value. In recent years, my country is vigorously developing the lithium-ion battery industry, and the production capacity of lithium-ion batteries continues to increase, but the safety issues of lithium-ion batteries that follow have also attracted more and more attention. [0003] The composition of a lithium-ion battery includes a positive electrode, a negative electrode, a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/14B82Y30/00B82Y40/00H01M50/403H01M50/44H01M50/446
CPCB82Y30/00B82Y40/00H01M50/431H01M50/44H01M50/403H01M50/411Y02E60/10
Inventor 李峥冯玉川杨帆南策文周忠年陈雷陈云席健尹小雨
Owner JIANGSU QINGTAO ENERGY TECH
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