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High-flame-retardant and high-air-permeability coated diaphragm and preparation method thereof

A highly breathable, highly flame-retardant technology, applied in the direction of separators/films/diaphragms/spacers, electrical components, structural parts, etc., can solve the problems of safety risks, reducing battery performance, increasing battery internal resistance, etc. Achieve the effect of increasing ionic conductivity, reducing the decrease in air permeability, and improving wettability

Pending Publication Date: 2022-06-24
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing separators are made of polyolefin materials, which have low wettability, which increases the internal resistance of the battery and reduces the performance of the battery. At the same time, the melting point of polyolefin materials is low. When the battery thermal runaway, the separator will rupture and cause heat loss. The out of control phenomenon will seriously cause the battery to burn or even explode, and there is a risk to safety
Coating the diaphragm can improve the above shortcomings. In the existing coating diaphragm, the wettability of the diaphragm to the electrolyte can be improved to a certain extent, but the coating will affect the porosity and reduce the lithium ion channel to a certain extent.
In addition, the existing high-temperature-resistant ceramic-coated diaphragm can delay the closure of the diaphragm to 150°C, but it cannot completely avoid the spontaneous combustion problem caused by the battery under high-temperature short-circuit

Method used

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  • High-flame-retardant and high-air-permeability coated diaphragm and preparation method thereof
  • High-flame-retardant and high-air-permeability coated diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: Mix 50 parts of ultrapure water, 0.3 parts of dispersant, and 40 parts of D50 zinc borate at 2 μm; add 3 parts of polymethyl methacrylate and mix well; add 7 parts of thickener and mix well, set it to Grind the slurry in a sand mill; add 4 parts of a binder and 0.35 part of a wetting agent and stir evenly to obtain a coating slurry.

[0031] Step 2: Apply the slurry on both sides of the base film, adopt the micro-gravure roll coating process, and roll the prepared coating slurry on both sides of the 9 μm polyethylene base film by a coating machine step by step. The layer thickness is 3 μm, and after being baked in a 65° C. oven, it is wound to obtain a coated separator.

Embodiment 2

[0033] Step 1: Mix 50 parts of ultrapure water, 0.3 parts of dispersant, and 45 parts of D50 zinc borate at 2 μm; add 3 parts of polymethyl methacrylate and mix well; add 7 parts of thickener and mix well, put it on the Grind the slurry in a sand mill; add 3.5 parts of a binder and 0.35 parts of a wetting agent and stir to obtain a coating slurry.

[0034] Step 2: Apply the slurry on both sides of the base film, adopt the micro-gravure roll coating process, and roll the prepared coating slurry on both sides of the 9 μm polyethylene base film by the coating machine step by step. The layer thickness is 3 μm, and after being baked in a 65° C. oven, it is wound to obtain a coated separator.

Embodiment 3

[0036] Step 1: Mix 50 parts of ultrapure water, 0.3 parts of dispersant, and 50 parts of D50 zinc borate at 2 μm; add 3 parts of polymethyl methacrylate and mix well; add 7 parts of thickener and mix well, set it to Grind the slurry in a sand mill; add 3.5 parts of a binder and 0.35 parts of a wetting agent and stir to obtain a coating slurry.

[0037] Step 2: Apply the slurry on both sides of the base film, adopt the micro-gravure roll coating process, and roll the prepared coating slurry on both sides of the 9 μm polyethylene base film by the coating machine step by step. The layer thickness is 3 μm, and after being baked in a 65° C. oven, it is wound to obtain a coated separator.

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Abstract

The invention discloses a high-flame-retardant and high-air-permeability coated diaphragm and a preparation method of the high-flame-retardant and high-air-permeability coated diaphragm. The preparation method of the coating diaphragm comprises the following steps: 1, uniformly mixing ultrapure water, a dispersing agent and micron-sized inorganic flame-retardant powder; adding polymethyl methacrylate, and uniformly mixing; adding a thickening agent, uniformly mixing, and grinding in a sand mill; adding a binder and a wetting agent, and uniformly stirring to obtain coating slurry; step 2, coating slurry on two sides of the base film to obtain a coating; and drying and rolling to obtain the coated diaphragm. The method has the beneficial effects that large-particle zinc borate (ZB) is used as a coating matrix; the reduction of the air permeability of the base membrane is reduced to the maximum extent, and the cellulose thickening agent with the nanocrystalline structure is combined, so that the high-flame-retardant and high-air-permeability coated diaphragm is provided. The base membrane is further pretreated to form a pre-coating part to replace the coating, and the adhesion of the base membrane and the coating further increases the ionic conductivity and air permeability of the coated diaphragm.

Description

technical field [0001] The invention relates to the technical field of diaphragms, in particular to a highly flame-retardant and highly breathable coated diaphragm and a preparation method thereof. Background technique [0002] Energy is the material basis for social survival and development. At present, the world's energy is still dominated by fossil energy, but it is a non-renewable resource with depletion and environmental problems; making energy structure reform one of the important tasks of energy development. In this context, new energy vehicles have been rapidly developed to reduce fossil energy consumption and environmental pollution. [0003] Due to the development of new energy vehicles, the power battery, the core component of electric vehicles, has become the focus of research, and its energy density, service life, and safety have received extensive attention. The diaphragm, one of the core components of the power battery, its main function is to isolate the po...

Claims

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Application Information

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IPC IPC(8): H01M50/40H01M50/403
CPCH01M50/40H01M50/403Y02E60/10
Inventor 刘美林张立斌赵海玉沈亚定
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD