Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of ceramic diaphragm and its preparation method and application

A technology of ceramic diaphragm and ceramic particles, which is applied in the direction of structural parts, electrical components, battery pack parts, etc., can solve the problems of unusable and insufficient electrochemical performance of batteries, and achieve reduced influence, high crystallinity, and broadened selection range Effect

Active Publication Date: 2017-07-04
BYD CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrochemical performance of batteries including this ceramic coating is still not excellent enough, and it cannot be used under relatively harsh conditions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of ceramic diaphragm and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024]The preparation method of the ceramic diaphragm provided by the present invention includes coating a slurry containing ceramic particles, a binder and high-density polyethylene on at least one side surface of the substrate and drying, and the particle size of the ceramic particles is not smaller than the specified The particle size of the above-mentioned high-density polyethylene, and the melting point of the high-density polyethylene is higher than 120°C.

[0025] Wherein, the specific types and contents of the ceramic particles, binder and high-density polyethylene have been described above, and will not be repeated here.

[0026] The binder is generally a polymer binder, therefore, in order to ensure its dispersibility in the slurry, the binder is preferably used in the form of a binder emulsion, and its solid content can be 30-60 weight%. In addition, in order to ensure the dispersibility in the slurry and ensure that it has a smaller particle size, the high-density...

Embodiment 1

[0035] This embodiment is used to illustrate the ceramic diaphragm provided by the present invention and its preparation method.

[0036] Add 0.045g of sodium polyacrylate (purchased from Shandong Taihe Water Treatment Co., Ltd., CAS No. 9003-04-7, the same below) and 1.2g of pure acrylic emulsion with a solid content of 50% by weight (purchased from Taihe Water Treatment Co., Ltd. From Guangdong Haishun New Material Technology Co., Ltd., brand HMP-2610, the same below), after stirring evenly, add 1.5g of aluminum oxide particles with a particle size of 400-500nm, stir at high speed, and then add 2.86g with a solid content of 35% by weight %, high-density polyethylene emulsion with a particle size of 50-100 nm (melting point is 135 ° C, purchased from Shanghai Xinnuo Chemical Co., Ltd.), and stirred evenly to obtain a slurry. Then the slurry is coated on the both sides of the PP separator (purchased from Huizhou Dewei Electronics Co., Ltd., model is 16-40, the same below) and ...

Embodiment 2

[0038] This embodiment is used to illustrate the ceramic diaphragm provided by the present invention and its preparation method.

[0039] Add 0.045g of polyethylene oxide (purchased from Guangzhou Liguo Trading Co., Ltd., CAS No. 25736-86-1) and 1.2g of styrene-acrylic emulsion with a solid content of 50% by weight (purchased from Shengda Chemical Co., Ltd. , grade S-01), after stirring evenly, add 1.5g of aluminum oxide particles with a particle size of 100-200nm, stir at high speed, and then add 2.5g of high-density Al2O3 particles with a solid content of 40% by weight and a particle size of 30-60nm Oxidized polyethylene (with a melting point of 137°C, purchased from Guangzhou Wanggao Chemical Co., Ltd., brand name A-C330) was stirred evenly to obtain a slurry. The slurry is then coated on both sides of the PP diaphragm and dried to obtain a ceramic diaphragm T2 comprising a base and a coating attached to both sides of the base, wherein the thickness of the base is 25 μm, an...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melting pointaaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a ceramic diaphragm, a preparation method of the ceramic diaphragm and the application of the ceramic diaphragm as a battery diaphragm. The ceramic diaphragm includes a substrate and a coating attached to at least one surface of the substrate, wherein the coating contains ceramic particles, a binder and high-density polyethylene, and the particle size of the ceramic particles is not smaller than The particle size of the high-density polyethylene, and the melting point of the high-density polyethylene is higher than 120°C. The ceramic diaphragm not only has high mass specific capacity, but also has high temperature self-blocking performance.

Description

technical field [0001] The invention relates to a ceramic diaphragm, a preparation method of the ceramic diaphragm and the application of the ceramic diaphragm as a battery diaphragm. Background technique [0002] Lithium-ion batteries are currently widely used in many fields such as mobile phones, computers, and electric vehicles due to their advantages such as high voltage, large specific energy, wide operating temperature range, high specific power, stable discharge, and long storage time. With the continuous increase of battery voltage and capacity, its safety risk is also gradually increasing, and the separator has a great influence on the safety performance of the battery. [0003] Since the traditional polyethylene (PE) separator and polypropylene (PP) separator have relatively low melting points, 125°C and 158°C respectively, these two separators are prone to deformation or even melting when the battery is overheated, making the positive and negative Pole short circ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/417H01M50/434H01M50/449H01M50/489
CPCH01M50/446Y02E60/10
Inventor 鲁丹单军
Owner BYD CO LTD