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Preparation and applications of ultralow-water-content ceramic slurry for lithium ion battery

A lithium-ion battery, ceramic slurry technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as battery capacity decline, battery pressure increase, affecting battery performance, etc., to reduce the number and water content. , the effect of small surface tension

Active Publication Date: 2020-01-03
DONGGUAN ADVANCED ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a more fatal problem with the ceramic coated separator, that is, the surface of the ceramic is easy to absorb moisture, and the moisture will cause the battery to generate gas, increase the internal pressure of the battery, decrease the battery capacity, and affect the performance of the battery.

Method used

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  • Preparation and applications of ultralow-water-content ceramic slurry for lithium ion battery
  • Preparation and applications of ultralow-water-content ceramic slurry for lithium ion battery
  • Preparation and applications of ultralow-water-content ceramic slurry for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of ultra-low water content ceramic slurry for lithium ion battery, comprises the raw material of following weight percent:

[0031]

[0032]

[0033] The ceramic powder is composed of a specific surface area of ​​2m 2 / g of alumina, the specific surface area is 3m 2 / g of magnesium oxide and a specific surface area of ​​2.5m 2 / g of boehmite is a mixture composed of 0.8:1.0:0.8 by weight.

[0034] The specific surface area is 2m 2 / g of alumina is prepared by the following steps:

[0035] 1) Using a wet ball milling process to grind conventional α-crystal form calcined alumina into alumina powder with a particle size of less than 1 μm, and set aside;

[0036] 2) Using spray drying to dry the alumina powder obtained in step 1) under the condition of 170° C., remove moisture, and set aside;

[0037] 3) The alumina powder dried in step 2) is placed under the condition of 1200° C. for calcination for 60 minutes, and finally the calcined alumina powder is gro...

Embodiment 2

[0047] A kind of ultra-low water content ceramic slurry for lithium ion battery, comprises the raw material of following weight percent:

[0048]

[0049] The ceramic powder is composed of a specific surface area of ​​4m 2 / g of alumina, the specific surface area is 4m 2 / g of magnesium oxide and a specific surface area of ​​3m 2 / g of boehmite is a mixture composed of 0.9:1.0:0.9 by weight.

[0050] The specific surface area is 4m 2 / g of alumina is prepared by the following steps:

[0051] 1) Using a wet ball milling process to grind conventional α-crystal form calcined alumina into alumina powder with a particle size of less than 1 μm, and set aside;

[0052] 2) Use spray drying to dry the alumina powder obtained in step 1) under the condition of 175° C., remove moisture, and set aside;

[0053] 3) The alumina powder dried in step 2) is placed under the condition of 1250° C. for calcination for 75 minutes, and finally the calcined alumina powder is ground by a dry b...

Embodiment 3

[0063] A kind of ultra-low water content ceramic slurry for lithium ion battery, comprises the raw material of following weight percent:

[0064]

[0065] The ceramic powder is composed of a specific surface area of ​​6m 2 / g of alumina, the specific surface area is 5m 2 / g of magnesium oxide and a specific surface area of ​​3.5m 2 / g of boehmite is a mixture composed of a weight ratio of 1.0:1.0:1.0.

[0066] The specific surface area is 6m 2 / g of alumina is prepared by the following steps:

[0067] 1) Using a wet ball milling process to grind conventional α-crystal form calcined alumina into alumina powder with a particle size of less than 1 μm, and set aside;

[0068] 2) Using spray drying to dry the alumina powder obtained in step 1) under the condition of 180° C., remove moisture, and set aside;

[0069] 3) The alumina powder dried in step 2) is placed at 1300° C. for calcination for 90 minutes, and finally the calcined alumina powder is ground by a dry ball mill...

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Abstract

The invention relates to the technical field of lithium ion battery separation membrane coating, specially to preparation and applications of ultralow-water-content ceramic slurry for a lithium ion battery, wherein the raw materials comprise, by weight, 35-45% of ceramic powder, 4-8% of a stabilizer, 3-6% of an adhesive, 0.001-0.3% of a dispersing agent, 0.001-0.2% of organopolysiloxane, 0.01-3% of polymethacrylate and the balance of deionized water. According to the invention, the water adsorption of the ceramic separation membrane is mainly controlled from the raw materials, the adsorption of the ceramic powder to free water in the air and the binding capacity of the ceramic powder to bound water are reduced by utilizing the ceramic powder with the low specific surface area, and by usingthe hydrophobic principle of the dispersing agent and the organopolysiloxane, the dispersing agent and the surface of the ceramic powder form super-hydrophobicity, so that the water adsorption capacity of the surface of the ceramic powder is synergistically reduced so as to reduce the water content of the ceramic separation membrane on the whole.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery diaphragm coating, in particular to the preparation and application of ultra-low water content ceramic slurry for lithium-ion batteries. Background technique [0002] With the increasing tension of market energy and the deterioration of environmental pollution, clean and environmentally friendly energy has attracted more and more attention. Lithium-ion batteries have the advantages of high energy density, light weight, long cycle life, low self-discharge rate, no memory effect, and environmental protection, so they are widely used in portable electronic devices, power tools, and electric vehicles. [0003] As one of the key materials in the battery, the lithium-ion battery separator plays a role in blocking the contact between the positive and negative electrodes of the battery, preventing electrons from passing through the battery, providing lithium-ion transport channels, and closed-...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D7/65C09D7/43C04B35/10C04B35/626H01M2/16H01M2/14
CPCC04B35/10C04B35/62605C04B35/62675C04B2235/5409C09D1/00C09D7/43C09D7/65H01M50/403H01M50/446Y02E60/10
Inventor 李雪王晓明杨浩田王志彬
Owner DONGGUAN ADVANCED ELECTRONICS TECH
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