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Waterborne ceramic slurry for lithium ion battery and preparation method of composite separator from waterborne ceramic slurry

A lithium-ion battery, ceramic slurry technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problem of lithium-ion battery safety degradation, reduction of diaphragm strength, thermal stability and puncture resistance, performance is not very good Taking into account and other issues, to achieve the effect of slurry stability, enhanced high temperature safety, and high adhesion

Inactive Publication Date: 2017-11-28
VONTRON MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of the current industrial separators cannot be well balanced. When pursuing high energy density and high-power charge and discharge capabilities, it is necessary to reduce the thickness of the separator and increase the porosity of the separator to reduce the internal resistance of the battery.
But this will inevitably reduce the strength, thermal stability and puncture resistance of the separator, and the safety of lithium-ion batteries will also decline sharply.

Method used

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  • Waterborne ceramic slurry for lithium ion battery and preparation method of composite separator from waterborne ceramic slurry
  • Waterborne ceramic slurry for lithium ion battery and preparation method of composite separator from waterborne ceramic slurry
  • Waterborne ceramic slurry for lithium ion battery and preparation method of composite separator from waterborne ceramic slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Preparation of Lithium-ion Battery Ceramic Composite Diaphragm

[0026] The mass percentage formula of water-based ceramic slurry is:

[0027]

[0028]

[0029] The preparation process of the water-based ceramic slurry is as follows: a) Add 15% boehmite, 0.2% polyethylene glycol 200 and 79.9% deionized water into the ball mill, set the speed at 2950rpm, and grind for 1 hour to obtain the dispersion I; b ) Pour the dispersion I into a high-speed disperser, add 4.8% polyvinylidene fluoride and 0.1% sodium dodecylbenzenesulfonate, and set the speed at 5000rpm. After dispersing for 2 hours, vacuum defoam for 24 hours, and filter through a 600-mesh stainless steel screen to obtain a water-based ceramic slurry;

[0030] The preparation process of the lithium-ion battery ceramic composite separator is: use a coating machine to evenly coat the water-based ceramic slurry on one side of the polyethylene microporous base membrane with a thickness of 5 μm and an a...

Embodiment 2

[0031] Example 2: Preparation of Lithium-ion Battery Ceramic Composite Diaphragm

[0032] The percentage formula of water-based ceramic slurry is:

[0033] formula

mass percentage

Aluminum oxide (average particle size 400nm)

40％

polyethylene glycol 1000

4％

SBR

5％

polyoxyethylene lauryl ether

1％

Deionized water

50％

[0034] The preparation process of the water-based ceramic slurry is as follows: a) Add 40% alumina, 4% polyethylene glycol 1000 and 50% deionized water into the ball mill, set the speed at 2950rpm, and grind for 1 hour to obtain the dispersion I; b) Pour the dispersion I into a high-speed disperser, add 5% styrene-butadiene rubber and 1% polyoxyethylene lauryl ether, and set the speed at 5000rpm. After dispersing for 2 hours, vacuum defoam for 24 hours, and filter through a 600-mesh stainless steel screen to obtain a water-based ceramic slurry;

[0035] The preparation process of the lithium...

Embodiment 3

[0036] Example 3: Preparation of Lithium-ion Battery Ceramic Composite Diaphragm

[0037] The percentage formula of water-based ceramic slurry is:

[0038] formula

mass percentage

Silica (average particle size 400nm)

20％

Polyvinylpyrrolidone K15

5％

Polymethylmethacrylate

0.5％

polyoxyethylene glyceryl ether

0.5％

Deionized water

74％

[0039] The preparation process of water-based ceramic slurry is as follows: a) add 20% silicon dioxide, polyvinylpyrrolidone K15 and 74% deionized water into the ball mill, set the speed at 2950rpm, and grind for 1 hour to obtain dispersion I; b) disperse Liquid I was poured into a high-speed disperser, and 0.5% polymethyl methacrylate and 0.5% polyoxyethylene glyceryl ether were added, and the rotation speed was set at 5000 rpm. After dispersing for 2 hours, vacuum defoam for 24 hours, and filter through a 600-mesh stainless steel screen to obtain a water-based ceramic slur...

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Abstract

The invention provides waterborne ceramic slurry for a lithium ion battery and a preparation method of a composite separator from the waterborne ceramic slurry. The waterborne ceramic slurry is prepared from inorganic powder, an adhesive, a dispersant, an aid and deionized water. The invention further provides a preparation method of the waterborne ceramic composite separator. Compared with oily ceramic coated lithium ion battery separators, the composite separator has good wettability, heat resistance and adhesion performance, a coating contains inorganic powder with uniform particle sizes, the safety performance of the battery is effectively improved, and the composite separator cannot cause pollution to the environment and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a preparation method of a lithium-ion battery water-based ceramic slurry and a composite separator thereof. Background technique [0002] Since its commercialization, lithium-ion batteries have been widely used in electronic products and electric vehicles due to their high operating voltage, high energy density, long service life, low self-discharge rate, and environmental protection. Coupled with the aggravation of environmental pollution and energy shortages, the state has increased technology promotion and financial support for lithium-ion batteries in recent years. [0003] With the large-scale application of lithium-ion batteries, their safety issues have become increasingly prominent. As one of the key components of lithium battery products, diaphragm is highly valued by the state in the field of new materials for its production and use. At present, separato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/406H01M50/417H01M50/434H01M50/489
CPCH01M50/446H01M50/403Y02E60/10
Inventor 郭玉阳陈心笛陈显勇吴宗策梁松苗金焱
Owner VONTRON MEMBRANE TECH CO LTD
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