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Functional coating diaphragm and battery containing same

A functional and coating technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of failing to meet the safety performance requirements of power batteries, limited improvement in power battery safety performance, etc., to improve the rate and cycle performance. , Excellent bonding performance and heat resistance, the effect of low coating expansion rate

Inactive Publication Date: 2016-10-26
WANXIANG 123 CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing P(VDF-HFP) coated separator has better thermal stability than conventional polyolefin separators, but due to its limited improvement in the safety performance of power batteries, it is mostly used in small 3C lithium-ion batteries
With the improvement of battery energy density, only coating P(VDF-HFP) can no longer meet the safety performance requirements of power batteries

Method used

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  • Functional coating diaphragm and battery containing same
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A functional coating diaphragm is composed of a polyolefin substrate and a coating coated on the surface of the polyolefin substrate.

[0032] Wherein, the material of the polyolefin substrate is polypropylene; the thickness of the polyolefin substrate is 20 microns.

[0033] The polyolefin substrate was coated on both sides; the thickness of the coating was 1.75 microns. The coating preparation slurry includes water-based polyvinylidene fluoride, inorganic nano ceramic particles and hydroxymethyl cellulose glue.

[0034] The mass ratio of inorganic nano-ceramic particles, water-based polyvinylidene fluoride, and hydroxymethyl cellulose glue is 94.5:2:3.4.

[0035] The solid content of the above-mentioned hydroxymethylcellulose glue is 1.35wt%.

[0036] The above-mentioned inorganic nano-ceramic particles are nano-alumina with a particle diameter of 500-600 nanometers.

[0037] The invention relates to a battery containing a functional coating diaphragm, which is use...

Embodiment 2

[0040] A functional coating diaphragm is composed of a polyolefin substrate and a coating coated on the surface of the polyolefin substrate.

[0041] Wherein, the material of the polyolefin substrate is polyethylene; the thickness of the polyolefin substrate is 15 microns.

[0042] The polyolefin substrate was coated on both sides; the thickness of the coating was 1.0 microns. The coating preparation slurry includes water-based polyvinylidene fluoride, inorganic nano ceramic particles and hydroxymethyl cellulose glue.

[0043] The mass ratio of inorganic nano-ceramic particles, water-based polyvinylidene fluoride, and hydroxymethyl cellulose glue is 94: 2.5: 3.8.

[0044] The solid content of the above-mentioned hydroxymethylcellulose glue is 1.35wt%.

[0045] The above-mentioned inorganic nano-ceramic particles are nano-silica with a particle diameter of 400-500 nanometers.

[0046] The invention relates to a battery containing a functional coating diaphragm, which is used...

Embodiment 3

[0049] A functional coating diaphragm is composed of a polyolefin substrate and a coating coated on the surface of the polyolefin substrate.

[0050]Wherein, the material of the polyolefin substrate is polyethylene; the thickness of the polyolefin substrate is 15 microns.

[0051] The polyolefin substrate was coated on both sides; the thickness of the coating was 1.0 microns. The coating preparation slurry includes water-based polyvinylidene fluoride, inorganic nano ceramic particles and hydroxymethyl cellulose glue.

[0052] The mass ratio of inorganic nano-ceramic particles, water-based polyvinylidene fluoride, and hydroxymethyl cellulose glue is 95:1.5:3.

[0053] The solid content of the above-mentioned hydroxymethylcellulose glue is 1.35wt%.

[0054] The above-mentioned inorganic nano-ceramic particles are nano-silica with a particle diameter of 400-500 nanometers.

[0055] The invention relates to a battery containing a functional coating diaphragm, which is used as t...

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Abstract

The invention discloses a functional coating diaphragm and a battery containing the same, belonging to the field of battery diaphragms. The functional coating diaphragm is composed of a polyolefin substrate and a coating on the surface of the polyolefin substrate. The preparation slurry of the coating comprises aqueous polyvinylidene fluoride, inorganic nano-ceramic particles and water. The diaphragm provided by the invention has more excellent bonding performance and heat resistance compared with a conventional p(VDF-HFP) coated diaphragm, so the safety performance of the battery is improved. The diaphragm is applied to novel silicon-carbon batteries and can effectively inhibit swelling of a silicon-carbon negative electrode, improve the cycle life of the battery and enhance the safety performance of a high-energy-density silicon-carbon electrical core.

Description

technical field [0001] The invention relates to the field of battery diaphragms, in particular to a functional coating diaphragm and a battery containing the diaphragm. Background technique [0002] Lithium-ion batteries are mainly composed of positive electrode / negative electrode materials, electrolyte, separator and battery packaging materials. The diaphragm is an important part of the lithium-ion battery. It plays the role of separating the positive and negative electrodes, preventing the internal short circuit of the battery, allowing the electrolyte ions to pass through freely, and completing the electrochemical charge and discharge process. Its performance determines the interface structure and internal resistance of the battery. It directly affects the capacity, cycle performance and safety performance of the battery. The separator with excellent performance plays an important role in improving the overall performance of the battery. It is called the "third electrode"...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525
CPCH01M10/0525H01M50/449Y02E60/10
Inventor 严红石先兴王慧敏
Owner WANXIANG 123 CO LTD
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