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Water-based coating material of lithium battery diaphragm, preparation method and lithium battery

A lithium battery separator, water-based coating technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problem of reducing the gas permeability of the separator and the migration number of lithium ions

Active Publication Date: 2021-02-23
上海大学浙江嘉兴新兴产业研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a water-based coating material for a lithium battery separator, a preparation method and a lithium battery to solve or partially solve the technical problems that the currently used organic thickeners will reduce the gas permeability of the separator and the migration number of lithium ions

Method used

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  • Water-based coating material of lithium battery diaphragm, preparation method and lithium battery
  • Water-based coating material of lithium battery diaphragm, preparation method and lithium battery
  • Water-based coating material of lithium battery diaphragm, preparation method and lithium battery

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preparation example Construction

[0036] Such as figure 2 As shown, this embodiment also provides a method for preparing a water-based coating material for a lithium battery separator, which is used to prepare the above-mentioned water-based coating material. The preparation method includes:

[0037] S1: Mix 10 to 60 parts by weight of micron-sized inorganic particles, 1 to 5 parts by weight of a dispersant, 0 to 1 part by weight of an antifoaming agent, and the balance of ultrapure water, and then perform the first stirring to obtain the first materials;

[0038] S2: Grinding the first stirring material, grinding the micron-sized inorganic particles to nano-inorganic particles with an average particle size of 300-800nm, and then removing iron and filtering to obtain an inorganic nano-dispersion;

[0039] S3: Take 30-90 parts by weight of inorganic nano-dispersion liquid and 0.1-10 parts by weight of inorganic thickener for the second stirring to obtain the second material; wherein, the inorganic thickener i...

Embodiment 1

[0051] Pour 47 parts of ultrapure water, 48 parts of alumina, 4 parts of sodium polyacrylate, and 1 part of polyoxypropylene glyceryl ether into the mixing tank in sequence, control the stirring speed at 120r / min, and pump the materials to the sand mill after stirring for 2 hours Grind for 8 minutes, during which the rotational speed of the grinder is controlled to be 1300r / min. After iron removal / filtration, an aluminum oxide nano-dispersion with an average particle size of 620nm and a hollow interior is obtained; then take 80 parts of the aluminum oxide nano-dispersion and control the pump speed at 130r / Add 5 parts of porous silica sol dropwise to the alumina nano-dispersion liquid at a stirring speed of 280r / min; then add 6 parts of polymethyl acrylate and 9 parts of other additives at a constant speed, and stir for 4 hours to obtain a lithium battery diaphragm water-based coating material .

[0052] Coat the above-mentioned coating slurry on the surface of the 9-micron PE...

Embodiment 2

[0054] Pour 51 parts of ultrapure water, 43 parts of silicon oxide, 5 parts of polyethylene glycol and 1 part of n-octanol into the mixing tank in sequence, control the stirring speed at 130r / min, and pump the materials to the sand mill for 10 minutes after stirring for 2 hours During the period, the rotating speed of the grinding machine is controlled to be 1250r / min, and the average particle size is 580nm and the hollow silicon oxide nano-dispersion is obtained after iron removal / filtration; Add 4 parts of nano-aluminum silicate dropwise to the silicon oxide nano-dispersion liquid at a stirring speed of 290r / min; then add 8 parts of polyethylacrylate and 3 parts of other additives at a constant speed, and stir for 4 hours to obtain a lithium battery separator water-based coating material.

[0055] Coat the above-mentioned coating slurry on the surface of the 9-micron PE base film by scrape coating and then dry it to obtain a single-sided coated PE diaphragm with a nano-inorga...

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Abstract

The invention discloses a water-based coating material of a lithium battery diaphragm. The water-based coating material comprises the following components in percentage by weight: 30%-90% of inorganicnano dispersion liquid, 1%-10% of a binder, 0.1%-10% of an inorganic thickener and the balance of other assistants, wherein the inorganic nano dispersion liquid comprises hollow inorganic nano particles; the inorganic thickener comprises at least one of nanoscale aluminum silicate, nanoscale magnesium aluminum silicate and porous silica sol; according to the water-based coating material, in the process of coating the diaphragm and volatilizing the coating, the inorganic thickener and the hollow inorganic nanoparticles can jointly maintain the structural integrity of stacked holes in the diaphragm, so that the air permeability of the diaphragm is improved, and the migration number and the thermal stability of lithium ions are improved; on the other hand, the inorganic thickener is used, sothat the prepared water-based diaphragm coating is more environment-friendly.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a water-based coating material for a lithium battery diaphragm, a preparation method and a lithium battery. Background technique [0002] Lithium-ion batteries are light in weight and rely on the movement of ions and electrons for charging and discharging. Compared with other secondary batteries, lithium-ion batteries have large unit energy and relatively long cycle life. They are not only used in smartphones, tablets, and wearable smart phones. Equipment and other digital products are widely used, and it is the main power supply of electric vehicles and hybrid vehicles. In the lithium battery structure, the separator is one of the key inner components. The main function of the separator is to separate the positive and negative electrodes of the battery to prevent short circuit caused by contact between the two electrodes. In addition, it also has the fun...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/446H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 施利毅管晓敏袁帅
Owner 上海大学浙江嘉兴新兴产业研究院
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