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Nano aluminum oxide diaphragm coating and preparation method thereof

A nano-alumina, aluminum oxide technology, applied in the direction of separator/film/diaphragm/spacer, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problem of lithium-ion battery capacity, cycle performance, safety performance, impact Lithium-ion battery diaphragm quality, aluminum oxide slurry is easy to precipitate and other problems, to achieve good coating construction performance, improve suspension stability, and ensure the quality of the effect

Pending Publication Date: 2022-05-17
上海凯矜新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the existing aluminum oxide diaphragm coatings for lithium-ion battery diaphragm coating have shortcomings such as easy precipitation of alumina slurry, poor wettability with PE film or PP film, poor adhesion, etc., thus affecting the quality of lithium-ion battery diaphragm , which ultimately affects the capacity, cycle performance and safety performance of lithium-ion batteries

Method used

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  • Nano aluminum oxide diaphragm coating and preparation method thereof
  • Nano aluminum oxide diaphragm coating and preparation method thereof
  • Nano aluminum oxide diaphragm coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0088] This embodiment provides a nano-alumina separator paint for coating the surface of a lithium-ion battery separator.

[0089] A kind of nano-alumina diaphragm coating that present embodiment provides comprises:

[0090] Nano-alumina particles, acrylic polymer particles, carboxymethyl cellulose, polyoxyethylene lauryl ether and pure water, of which:

[0091] The nano-alumina diaphragm coating has a solid content of 38% to 42% (mass percentage), a viscosity of 100 to 300mPa.s, and a pH of 8 to 9; and

[0092] The particle size distribution of nano-alumina particles in the nano-alumina diaphragm coating is: D50 is between 0.4 and 0.8 μm and D90 is not greater than 2.5 μm.

[0093] From the above description, it can be seen that:

[0094] First of all, in this embodiment, nano-alumina particles with characteristics of insulation, heat insulation, flame retardancy, high temperature resistance, and self-shutoff are selected as the aggregate of nano-alumina diaphragm coating ...

Embodiment 2

[0114] This embodiment provides a preparation method of the nano-alumina diaphragm coating described in the above-mentioned embodiment 1.

[0115] A preparation method of nano-alumina diaphragm coating, comprising the steps of:

[0116] Mix nano-alumina particles with pure water and grind them into nano-alumina slurry;

[0117] Carboxymethyl cellulose and pure water are stirred and mixed to make carboxymethyl cellulose slurry;

[0118] mixing and stirring the nano-alumina slurry and the carboxymethyl cellulose slurry; or

[0119] Mixing the nano-alumina slurry and the carboxymethyl cellulose slurry, adding a dispersant and stirring to prepare an alumina-cellulose mixed solution;

[0120] Adding acrylic polymer particles to the alumina cellulose mixture and stirring to prepare the alumina cellulose polymer mixture;

[0121] Adding polyoxyethylene lauryl ether into the alumina cellulose polymer mixture and stirring and mixing to prepare the alumina cellulose polymer alkyl eth...

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Abstract

The invention relates to a nanometer aluminum oxide diaphragm coating and a preparation method thereof, the nanometer aluminum oxide diaphragm coating comprises nanometer aluminum oxide particles, acrylic polymer particles, carboxymethyl cellulose, polyoxyethylene dodecyl ether and pure water, the solid content is 38-42% (mass percent), the viscosity is 100-300 mPa.s, the pH value is 8-9, and the viscosity of the nanometer aluminum oxide diaphragm coating is 100-300 mPa.s. The particle size distribution of the nano aluminum oxide particles is that D50 is between 0.4 mu m and 0.8 mu m, and D90 is not greater than 2.5 mu m; the preparation method comprises the following steps: preparing nano aluminum oxide slurry and carboxymethyl cellulose slurry, preparing an aluminum oxide cellulose mixed solution, an aluminum oxide cellulose polymer mixed solution and an aluminum oxide cellulose polymer alkyl ether mixed solution, adjusting the pH value and the like. The lithium ion battery diaphragm coating is novel in formula, reasonable in proportion, good in coating construction performance and product stability, unique in preparation method and capable of guaranteeing the quality of a lithium ion battery diaphragm and improving the comprehensive performance of a lithium ion battery.

Description

technical field [0001] The invention relates to a diaphragm coating coated on the surface of a lithium-ion battery diaphragm and a preparation method thereof, in particular to a nano-alumina diaphragm coating and a preparation method thereof, belonging to the technical field of production and preparation of lithium-ion battery diaphragm coating materials. Background technique [0002] Lithium-ion battery is a secondary battery, also known as a rechargeable battery, which relies on the movement of lithium ions between the positive and negative electrodes to achieve charging and discharging. During its charging and discharging process, Li + Intercalation and deintercalation are performed back and forth between the two electrodes, where, when charged, the Li + It is deintercalated from the positive electrode, embedded in the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state. When discharging, the situation is just the opposite, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/40H01M50/403H01M50/414H01M50/417H01M50/434
CPCH01M50/40H01M50/403H01M50/414H01M50/417H01M50/434Y02P70/50
Inventor 赵丽萍何金波彭诚徐宽
Owner 上海凯矜新材料科技有限公司
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