Diaphragm for lithium-ion power battery and manufacturing method thereof

A power battery and lithium-ion technology, which is applied in battery pack parts, chemical instruments and methods, separators/films/diaphragms/spacers, etc., can solve the heat resistance, puncture resistance and corrosion resistance of the diaphragm To achieve the effects of good thermal safety performance, improved liquid retention performance, structural strength and heat resistance of the diaphragm

Active Publication Date: 2017-04-19
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to solve the problems of poor heat resistance, puncture resistance and corrosion resistance of the diaphragm in the prior art, and provides a diaphragm for lithium-ion power batteries. The diaphragm has excellent heat resistance and puncture resistance. Performance and corrosion resistance, good thermal safety performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) The non-woven fabric made of nanocellulose (diameter 1-100nm, length 100-200nm) and polymer (polyethylene terephthalate) with a mass ratio of 1:20 is used as the base Material layer, the thickness of the substrate layer is 16 μm, and the non-woven fabric is treated with a frequency of 10KHz and a power of 100W in a sodium chloride solution with a mass concentration of 3% and a temperature of 80°C for 90 minutes and then dried.

[0035] (2) Wash the dried non-woven fabric with deionized water and then dry it at 50°C.

[0036] (3) Mix the binder with the ceramic particles, add a solvent, then add 5% alcohol by mass of the ceramic particles, and ball mill to a fineness of 15 μm to obtain a slurry, wherein the binder is polyvinylidene fluoride, and the solvent is N -Methylpyrrolidone, the ceramic particles are silicon dioxide with an average particle size of 3nm, the alcohol is ethanol, the amount of solvent added is based on controlling the viscosity of the slurry at 2...

Embodiment 2

[0040] (1) The non-woven fabric processed from nanocellulose (diameter 1-100nm, length 100-200nm) and polymer (polyethylene terephthalate) with a mass ratio of 1:22 is used as the base Material layer, the thickness of the substrate layer is 22 μm, the non-woven fabric is treated with a frequency of 15KHz and a power of 200W in a sodium chloride solution with a mass concentration of 4% and a temperature of 85°C for 60 minutes and then dried.

[0041] (2) Wash the dried non-woven fabric with deionized water and dry it at 60°C.

[0042] (3) Mix the binder with the ceramic particles, add the solvent, then add 15% alcohol by mass of the ceramic particles, and at the same time add a defoamer (polysiloxane), and ball mill to a fineness of 18 μm to obtain a slurry, wherein, The binder is polyvinylidene fluoride, the solvent is N-methylpyrrolidone, the ceramic particles are silicon dioxide and aluminum oxide with an average particle size of 100nm, the alcohol is ethanol, and the amount...

Embodiment 3

[0046] (1) The non-woven fabric made of nanocellulose (diameter 1-100nm, length 100-200nm) and polymer (polyethylene terephthalate) with a mass ratio of 1:25 is used as the base Material layer, the thickness of the substrate layer is 27 μm, the non-woven fabric is treated with a frequency of 20KHz and a power of 300W in a sodium chloride solution with a mass concentration of 5% and a temperature of 90°C for 30 minutes and then dried.

[0047] (2) Wash the dried non-woven fabric with deionized water and then dry it at 70°C.

[0048] (3) After mixing the binder with the ceramic particles, add the solvent, then add alcohol with 20% of the mass of the ceramic particles, and at the same time add a wetting agent (polyoxyethylene alkylphenol ether) and ball mill to a fineness of 20 μm to obtain a slurry. Wherein, the binder is polyvinylidene fluoride, the solvent is N-methylpyrrolidone, the ceramic particles are silicon dioxide, aluminum oxide and zirconia with an average particle di...

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PUM

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Abstract

The invention discloses a diaphragm for lithium-ion power batteries, which solves the problems of poor heat resistance, puncture resistance and corrosion resistance of the diaphragm in the prior art. It includes a base material layer and coating on both sides of the base material layer The slurry layer, the substrate layer is a non-woven fabric processed from nano-cellulose and polymer with a mass ratio of 1:20-25, and the raw materials of the slurry layer include binders and ceramic particles. The invention has excellent heat resistance, puncture resistance and corrosion resistance. The invention also discloses a manufacturing method of a separator for a lithium-ion power battery, which mainly includes the following steps: first cleaning the non-woven fabric with sodium chloride solution; then washing the non-woven fabric with deionized water and drying; After the binder is mixed with the ceramic particles, a solvent is added and ball milled with 5-20% alcohol of the mass of the ceramic particles to obtain a slurry; finally, the slurry is coated on both sides of the non-woven fabric and dried in stages to obtain a separator. The process step of the invention is simple, easy to operate, and the slurry is thoroughly dried.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a separator for lithium-ion power batteries and a manufacturing method thereof. Background technique [0002] With the advent of a low-carbon economy, the demand for lithium-ion power batteries is increasing, and the biggest obstacle facing power batteries is safety issues. Under the condition of high current, due to the limitation of the performance of the electrode material itself, the lithium-ion battery will easily lead to the deposition of metal lithium on the surface of the negative electrode, forming a large number of dendrites. Potential safety hazards, so it can be said that the battery separator has a direct impact on the safety of the battery. [0003] At present, the separators of commercial lithium-ion power batteries are mainly porous polymer membranes (such as polypropylene separators, polyethylene separators, or composite separators made of polyprop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16B32B37/12H01M50/434
CPCB32B37/12B32B2037/1269H01M50/409H01M50/411H01M50/44Y02E60/10
Inventor 严红
Owner WANXIANG 123 CO LTD
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