Ultrathin coated diaphragm and preparation method thereof

A coating and diaphragm technology, applied in the direction of structural parts, electrical components, battery pack parts, etc., can solve the problems of irreversibility, affecting high-power charging and discharging, and unsatisfactory safety, so as to achieve good discharge capacity and improve ion conductivity The effect of increasing the interface compatibility

Active Publication Date: 2022-07-05
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shrinkage of the single-degree polyolefin diaphragm at high temperature is irreversible, which cannot meet the safety requirements.
Therefore, it is now mostly used to coat 3-4μm alumina slurry on the surface of single-strength polyolefin separators to improve the high temperature resistance of the battery separator; however, the coating also increases the thickness of the separator. The greater the thickness, the higher the internal resistance, which affects High power charge and discharge

Method used

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  • Ultrathin coated diaphragm and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0048] S1: Mix 60 parts of ultrapure water and 0.35 parts of dispersant according to the parts by mass, and then add 30 parts of small-particle alumina, after stirring, add 0.7 parts of multi-walled carbon nanotubes and stir evenly; Add 5 parts of thickener and mix evenly; grind the obtained slurry through a sand mill, and finally add 4 parts of binder and 0.1 part of wetting agent and stir to obtain a coating slurry;

[0049] The dispersing agent is polyacrylic acid, the thickening agent is hydroxymethyl cellulose, the binder is polyethanol, and the wetting agent is isomerized tenol alkoxylate; the D50 of the alumina powder is 0.4 μm; The diameter of the wall carbon nanotubes is 30nm and the length is 1μm;

[0050] The preparation of carboxylic acid-modified multi-walled carbon nanotubes includes the following steps: adding 1 part by weight of multi-walled carbon nanotubes to 22 parts by weight of sulfuric acid, stirring at 130° C. for 16 hours, washing with deionized water, ...

Embodiment 2

[0053] S1: Mix 60 parts of ultrapure water and 0.35 parts of dispersant according to the parts by mass, and then add 20 parts of small-particle alumina, after high-speed stirring, add 0.9 parts of multi-walled carbon nanotubes and stir evenly; Then add 5 parts of thickener and mix it evenly; grind the obtained slurry through a sand mill, and finally add 4 parts of binder and 0.1 part of wetting agent and stir evenly to obtain a coating slurry;

[0054] The dispersing agent is polyacrylic acid, the thickening agent is hydroxymethyl cellulose, the binder is polyethanol, and the wetting agent is isomeric tenol alkoxylate; the D50 of the alumina powder is 0.5 μm; The diameter of the wall carbon nanotube is 50nm and the length is 1μm;

[0055] The preparation of carboxylic acid-modified multi-walled carbon nanotubes includes the following steps: adding 1 part by weight of multi-walled carbon nanotubes to 22 parts by weight of sulfuric acid, stirring at 130° C. for 16 hours, washing...

Embodiment 3

[0058] S1: Mix 60 parts of ultrapure water and 0.35 parts of dispersant according to parts by mass, and then add 40 parts of small-particle alumina, after high-speed stirring, add 0.6 parts of multi-walled carbon nanotubes and stir evenly; Then add 5 parts of thickener and mix it evenly; grind the obtained slurry through a sand mill, and finally add 4 parts of binder and 0.1 part of wetting agent and stir evenly to obtain a coating slurry;

[0059] The dispersing agent is polyacrylic acid, the thickening agent is hydroxymethyl cellulose, the binder is polyethanol, and the wetting agent is isomeric tenol alkoxylate; the D50 of the alumina powder is 0.5 μm; The diameter of the wall carbon nanotube is 60nm and the length is 2μm;

[0060] The preparation of carboxylic acid-modified multi-walled carbon nanotubes includes the following steps: adding 1 part by weight of multi-walled carbon nanotubes to 22 parts by weight of sulfuric acid, stirring at 130° C. for 16 hours, washing wit...

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Abstract

According to the ultrathin coating diaphragm and the preparation method thereof provided by the invention, the ultrathin coating diaphragm with high heat resistance, thermal dimensional stability and high wettability is prepared by limiting components and a process; the base membrane is coated with slurry prepared from superfine aluminum oxide particles and multi-walled carbon nanotubes, so that the coated diaphragm has thermal shrinkage resistance, high liquid retention and low internal resistance; small-particle aluminum oxide is hydroxylated, the hydroxylated aluminum oxide is coated and modified by carbomer, and the surface electrostatic repulsion of the hydroxylated aluminum oxide effectively improves the dispersion uniformity of the small-particle aluminum oxide in the diaphragm and synergistically improves the crosslinking complexity of each component in the diaphragm under the conditions of not adding a dispersing agent and reducing a binder; the mechanical strength and the electrolyte wettability of the diaphragm are improved; through electrostatic spinning and in-situ growth, polybenzimidazole and polyetherimide are utilized to prepare a porous diaphragm with a pseudo-boehmite two-dimensional nanosheet layer grown on the surface, and the porous diaphragm is used as a base membrane.

Description

technical field [0001] The invention relates to the field of battery separators, in particular to an ultra-thin coated separator and a preparation method thereof. Background technique [0002] Lithium-ion batteries have now become the main power source for various electronic products and electric vehicles because of their high operating voltage, low self-discharge, high energy density, and long cycle life. The separator is an important material for lithium-ion batteries, which isolates the positive and negative electrodes of the battery to prevent short-circuiting of the battery; and the separator allows the free conduction of lithium ions, but in the event of overcharge or temperature rise, The separator blocks the conduction of lithium ions through closed pores, preventing dangerous situations such as spontaneous combustion and explosion. The performance of the separator affects the interface structure and internal resistance of the battery, and is directly related to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/457H01M50/431H01M50/489H01M50/403H01M10/0525
CPCH01M50/457H01M50/431H01M50/489H01M50/403H01M10/0525Y02E60/10
Inventor 刘美林张立斌赵海玉沈亚定
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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