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A kind of battery diaphragm and preparation method thereof

A battery separator and base layer technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of poor adhesion, easy falling off of inorganic particles, etc., and achieve good ionic conductivity, strong adhesion, and high temperature. The effect of stability

Active Publication Date: 2017-09-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the organic / inorganic composite porous separator prepared in the prior art in order to improve the heat resistance stability of the battery separator, the organic / inorganic composite layer coating has poor adhesion to the substrate, and the coating The inorganic particles in the layer are easy to fall off, thereby providing a battery separator with good heat resistance stability and strong adhesion between the inorganic coating layer and the base layer and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The battery separator described in this embodiment includes a base layer and an inorganic coating coated on its surface, wherein the components of the base layer include polyethylene and polyvinyl alcohol, and the components of the inorganic coating include oxidation Aluminum and styrene-butadiene rubber, prepared as follows:

[0032] (1) Mix 39 parts by weight of polyethylene with 1 part by weight of polyvinyl alcohol, and prepare the base layer by spinning, wherein the spinning voltage is 40kv, the distance between the spinneret and the collecting plate is 13cm, and the spinning The silk temperature is 200°C; the thickness of the base layer is 35 μm, the porosity is 60%, and the mass percentage of polyvinyl alcohol in the base layer is 2.5wt%;

[0033] (2) Dilute the styrene-butadiene rubber emulsion with a solid content of 40% with water to form a mixture containing 1 part by weight of styrene-butadiene rubber and 38 parts by weight of water, and then add 11 parts by...

Embodiment 2

[0036] The battery separator described in this embodiment comprises a base layer and an inorganic coating coated on its surface, wherein the components of the base layer include polypropylene and polyvinylpyrrolidone, and the components of the inorganic coating include titanium Magnesium acid and nitrile rubber, prepared as follows:

[0037] (1) Mix 24 parts by weight of polypropylene with 1 part by weight of polyvinylpyrrolidone, and prepare the base layer by spinning, wherein the spinning voltage is 40kv, the distance between the spinneret and the collecting plate is 13cm, and the spinning The silk temperature is 250°C; the thickness of the base layer is 25 μm, the porosity is 69%, and the mass percentage of polyvinylpyrrolidone in the base layer is 4wt%;

[0038] (2) Dilute the nitrile rubber emulsion with a solid content of 40% with water to prepare a mixture containing 1 part by weight of nitrile rubber and 43 parts by weight of water, then add 8.5 parts by weight of magn...

Embodiment 3

[0041] The battery separator described in this embodiment comprises a base layer and an inorganic coating coated on its surface, wherein the components of the base layer include polyethylene terephthalate and hydroxymethyl cellulose, so The components of the inorganic coating include zinc sulfate and water-based epoxy glue, which are prepared by the following method:

[0042] (1) Mix 99 parts by weight of polyethylene terephthalate with 1 part by weight of hydroxymethyl cellulose, and prepare the base layer by spinning, wherein the spinning voltage is 40kv, and the spinneret The distance from the collecting plate is 13 cm, and the spinning temperature is 300 ° C; the thickness of the base layer is 10 μm, the porosity is 95%, and the mass percentage of hydroxymethylcellulose in the base layer is 1 wt %;

[0043] (2) Mix the water-based epoxy resin with water to prepare a mixed solution containing 1 weight part of epoxy resin and 48 weight parts of water, then add 6 weight parts...

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Abstract

The invention relates to a battery separator, comprising a base layer and an inorganic coating coated on its surface, and by adding a water-soluble resin to the base layer, the water in the inorganic slurry can be dissolved during preparation Or swell the water-soluble resin in the base layer, so that the base layer and the inorganic coating interpenetrate at the junction to form a mechanical interlock, which greatly increases the bonding strength. In the battery separator of the present invention, the adhesion between the base layer and the inorganic coating is strong, so that the battery separator not only has better high temperature stability during use, but also can effectively avoid the loss of inorganic particles in the inorganic coating. caused a series of problems.

Description

technical field [0001] The invention relates to a battery diaphragm and a preparation method thereof, in particular to a lithium ion battery diaphragm and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used as power sources for various mobile devices since their commercialization due to their high energy density, high operating voltage, no memory effect, and long cycle life. However, with the large-scale application of lithium-ion batteries, battery safety issues have become increasingly prominent. The main components of a lithium-ion battery include the positive electrode, negative electrode, separator, and electrolyte. Among them, the diaphragm is inserted between the positive and negative electrodes of the battery in sequence, and its main function is to physically isolate the positive and negative electrodes of the lithium-ion battery to prevent internal short ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/417
CPCH01M50/446Y02E60/10
Inventor 陈小芳苗伟峰周维
Owner BYD CO LTD
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