Ceramic diaphragm and preparation method and application thereof

A technology of ceramic diaphragm and ceramic coating, applied in structural parts, electrical components, battery pack parts, etc., can solve the problem that battery diaphragm cannot have both electrochemical performance and safety performance at the same time, and achieve good electrochemical performance and safety. properties, the effect of increasing mechanical properties and heat shrinkage properties

Active Publication Date: 2016-04-27
BYD CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention solves the technical problem that the battery diaphragm in the prior art cannot have both electrochemical performance and safety perf

Method used

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  • Ceramic diaphragm and preparation method and application thereof
  • Ceramic diaphragm and preparation method and application thereof
  • Ceramic diaphragm and preparation method and application thereof

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Embodiment approach

[0034] As a preferred embodiment of the present invention, the binder is an aqueous polyacrylate emulsion. On the one hand, the water-based polyacrylate emulsion is a hydrophilic system, which is very environmentally friendly; on the other hand, the water-based polyacrylate emulsion has a self-crosslinking function, and it can be used in conjunction with small-sized inorganic ceramic powders and one-dimensional nanomaterials. Obtain a ceramic diaphragm with higher mechanical properties, high adhesion strength and high air permeability.

[0035] In the present invention, the ceramic coating further contains a dispersant. The content of the dispersant can be selected according to the content of the ceramic particles. Preferably, in the ceramic coating, based on 100 parts by weight of inorganic ceramic powder, the content of the dispersant is 0.4-4 wt. share. The dispersant can be various existing substances that can promote the uniform dispersion of the components in the coati...

Embodiment 1

[0049] This example is used to illustrate the ceramic diaphragm provided by the present invention and its preparation method.

[0050] In this embodiment, the composition and content of the ceramic slurry are: alumina powder (with a particle size of 80-100nm): 100 parts by weight; titanium dioxide nanorods (the SEM morphology of which is as follows figure 1 As shown, the diameter is 40-200nm, the length is 0.5-10μm): 11 parts by weight; aqueous self-crosslinking polyacrylate emulsion (1005 emulsion, Shanghai Aigao Chemical Co., Ltd.): 5.55 parts by weight; PEG (molecular weight 10000g / mol): 1.11 parts by weight, PVA: 1.11 parts by weight.

[0051] The preparation method is as follows: (1) Disperse alumina powder in an appropriate amount of water to form an alumina suspension; (2) Disperse titanium dioxide nanorods with an ultrasonic breaker to obtain an aqueous dispersion of titanium dioxide nanorods; Add alumina suspension, PEG, and PVA to the water dispersion of the stick,...

Embodiment 2

[0053] In this embodiment, the composition and content of the ceramic slurry are: alumina powder (with a particle size of 80-100nm): 100 parts by weight; titanium dioxide nanorods (the SEM morphology of which is as follows figure 1 As shown, the diameter is 40-200nm, the length is 0.5-10μm): 25 parts by weight; water-based self-crosslinking polyacrylate emulsion (1005 emulsion, Shanghai Aigao Chemical Co., Ltd.): 7.25 parts by weight; PEG (molecular weight 10000g / mol): 1.25 parts by weight, PVA: 1.25 parts by weight.

[0054] The preparation method is as follows: (1) Disperse alumina powder in an appropriate amount of water to form an alumina suspension; (2) Disperse titanium dioxide nanorods with an ultrasonic breaker to obtain an aqueous dispersion of titanium dioxide nanorods; Add alumina suspension, PEG, and PVA to the water dispersion of the stick, stir until uniformly dispersed, and obtain a mixed dispersion; (4) continue to add 1005 emulsion under stirring, and obtain ...

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Abstract

The invention provides a ceramic diaphragm and a preparation method thereof and an application of the ceramic diaphragm as a battery diaphragm. The ceramic diaphragm comprises a matrix and a ceramic coating, wherein the ceramic coating is attached to at least one side surface of the matrix; the ceramic coating contains inorganic ceramic powder and a one-dimensional nanometer material; the particle sizes of the inorganic ceramic powder are 5-250nm; the diameters of the one-dimensional nanometer material are 5-800nm; and the lengths are 500nm to 50 microns. The ceramic diaphragm not only has relatively high mechanical property and thermal shrinkage property, but also has good electrochemical properties and safety 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

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/434H01M50/443H01M50/489
CPCY02E60/10
Inventor 胡家玲鲁丹单军吴金祥
Owner BYD CO LTD
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