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Membrane and preparation method thereof as well as lithium ion battery

A diaphragm and ceramic particle technology, applied in the direction of secondary batteries, battery pack parts, circuits, etc., can solve the problems of poor chemical corrosion resistance, low strength, poor heat resistance of the diaphragm, etc., and achieve good heat resistance and durability Chemical corrosion performance, high strength, long life effect

Active Publication Date: 2012-04-11
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problems of poor heat resistance, low strength and poor chemical corrosion resistance of the diaphragm in the prior art, the present invention provides a diaphragm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] Simultaneously, the preparation method of above-mentioned separator disclosed in the present invention comprises:

[0026] a. Activate the surface of the insulating carbon fiber non-woven fabric;

[0027] b. Mixing the silane coupling agent, binder, ceramic particles and water at a pH value of 3-5 to obtain a slurry;

[0028] c. Coating the slurry on both sides of the insulating carbon fiber non-woven fabric, and curing.

[0029] According to the present invention, methods for activating the surface of the insulating carbon fiber nonwoven fabric are known in the prior art, for example, corona or plasma treatment can be used. The above-mentioned corona treatment can be carried out in corona equipment, such as the corona machine produced by Nantong Sanxin Electronics Co., Ltd., model CW1003P. When performing corona activation, the conditions of the corona activation are: voltage 1-3kv, transmission speed 1.5-4.5m / min. In order to achieve a better corona activation effe...

Embodiment 1

[0054] This example is used to illustrate the separator disclosed in the present invention and its preparation method.

[0055] 1. Surface activation of insulating carbon fiber nonwovens

[0056] The insulating carbon fiber non-woven fabric (provided by Hunan University, A4 paper size, thickness 10um, carbon fiber diameter 3um) was placed in a corona device (corona machine produced by Nantong Sanxin Electronics Co., Ltd., model CW1003P), and the insulating carbon fiber was not affected. Corona activation is performed on both sides of the woven fabric, and the conditions for corona activation are: voltage 1kv, transmission speed 3m / min.

[0057] 2. Preparation of slurry

[0058] 100 parts by weight of Al 2 o 3 (average particle size is 0.4um), 10 parts by weight of silane coupling agent (tetraethoxysilane), 6 parts by weight of water-based epoxy resin (AW875 produced by Dow Corning) and 70 parts by weight of water at a pH of 3 Mix to obtain a slurry.

[0059] 3. Coatin...

Embodiment 2

[0064] This example is used to illustrate the separator disclosed in the present invention and its preparation method.

[0065] 1. Cleaning of insulating carbon fiber non-woven fabrics

[0066] Soak the insulating carbon fiber non-woven fabric (provided by Hunan University, A4 paper size, thickness 25um, carbon fiber diameter 10um) in an ethanol solution with a volume concentration of 30 vol% in an ultrasonic environment of 25KHZ for 30min, and then wash it with deionized water Three times and dried at 110°C.

[0067] 2. Surface activation of insulating carbon fiber nonwovens

[0068] Arrange the cleaned insulating carbon fiber non-woven fabric in a corona device (corona machine produced by Nantong Sanxin Electronics Co., Ltd., model CW1003P), and corona activate both sides of the insulating carbon fiber non-woven fabric. The conditions for corona activation For: voltage 3kv, transmission speed 4.5m / min.

[0069] 3. Preparation of slurry

[0070] 100 parts by weight of...

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Abstract

The invention provides a membrane and a preparation method thereof as well as a lithium ion battery. The membrane comprises a substrate and size layers arranged on two sides of the substrate, wherein the size layers comprise ceramic particles, a silane coupling agent and an adhesion agent, and the substrate is an insulating carbon fiber non-woven fabric. The membrane disclosed by the invention has the advantages of good heat-resistant property, chemical corrosion resistant property, high strength and capability of effectively avoiding short circuit in the battery caused by puncture of lithium dendrites. The lithium ion battery prepared from the membrane disclosed by the invention has the advantages of excellent safety performance and high temperature resistance and long service life.

Description

technical field [0001] The invention relates to a diaphragm, a preparation method thereof and a lithium ion battery. Background technique [0002] Separators are generally porous, electrically insulating materials with high ion permeability, good mechanical strength, and long-term stability to chemicals and solvents used in the system (eg, in the electrolyte of a battery). In a battery the separator should completely electrically insulate the cathode from the anode, but be permeable to the electrolyte. Also, the diaphragm must be elastic and able to move within the motor assembly during the system, such as charging and discharging. [0003] The separators used today are mainly porous organic polymer membranes or consist of non-woven fabrics, such as non-woven fabrics of glass or ceramic materials or other ceramic papers. Typical organic separators are, for example, polypropylene or consist of polypropylene / polyethylene / polypropylene composites. [0004] Lithium batteries,...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 鲁遥
Owner BYD CO LTD
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