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Polyolefin lithium battery diaphragm coating slurry and application thereof

A lithium battery diaphragm and polyolefin technology, applied in secondary batteries, battery components, circuits, etc., can solve the problem of insufficient ionic conductivity of composite diaphragms, achieve improved cycle stability, high conductivity, and simple preparation process Effect

Inactive Publication Date: 2019-08-20
SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ionic conductivity of the composite separator is not enough

Method used

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  • Polyolefin lithium battery diaphragm coating slurry and application thereof
  • Polyolefin lithium battery diaphragm coating slurry and application thereof
  • Polyolefin lithium battery diaphragm coating slurry and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Get 50g of single-layer graphene powder prepared by the liquid phase method and add it to 500g deionized water, stir and disperse evenly, add 5g SA, and obtain graphene aqueous slurry after 6 hours of high-speed stirring. The prepared graphene slurry is then coated on a 20-micron thick PP / PE / PP multilayer diaphragm (porosity: 44 ± 4, unit : %), obtain the graphene-coated composite diaphragm through baking, winding. Wherein, the coating speed is 5 m / min, the coating thickness is 8 microns, and the drying temperature is 80° C.

[0046] Replace the conventional commercial diaphragm with a composite diaphragm, lithium iron phosphate as the positive electrode, graphite as the negative electrode, 1mol / L LiPF6+EC (ethylene carbonate) / DMC (dimethyl carbonate) / EMC (ethyl methyl carbonate) (volume ratio of 1 : 1: 1) is the electrolyte, which is composed of 18650 cylindrical batteries. After formation, pre-charging, aging, and finally testing.

Embodiment 2

[0048] Take 10g graphene powder, 10g graphene-coated Al 2 o 3 Add the powder into a container containing 150g of deionized water, stir and disperse evenly, add 0.5g of PVDF, and then use planetary ball milling to obtain an aqueous slurry, stirring for 8 hours. Subsequently, the prepared water-based slurry is coated on a 15 micron thick PE base film (porosity: 42 ± 4, unit: %) through the coating equipment of the above-mentioned invention by means of slit extrusion coating, after drying Baked and rolled to obtain graphene-coated Al 2 o 3 / graphene-coated composite separator. Wherein, the coating speed is 6m / min, the coating thickness is 15 microns, and the drying temperature is 80°C.

[0049]Replace the conventional commercial diaphragm with a composite diaphragm, lithium iron phosphate as the positive electrode, graphite as the negative electrode, 1mol / L LiPF6+EC (ethylene carbonate) / DMC (dimethyl carbonate) / EMC (ethyl methyl carbonate) (volume ratio of 1 : 1: 1) is the ...

Embodiment 3

[0051] Take 20g of graphene-coated Al 2 o 3 Add the powder into a container containing 200g of deionized water, stir and disperse evenly, add 0.5g of PVDF, and then use the method of planetary ball milling to obtain an aqueous slurry, stirring for 8 hours. Subsequently, the prepared water-based slurry is coated on a 15 micron thick PE base film (porosity: 42 ± 4, unit: %) through the coating equipment of the above-mentioned invention by means of slit extrusion coating, after drying Baked and rolled to obtain graphene-coated Al 2 o 3 Coated composite separator. Wherein, the coating speed is 10 m / min, the coating thickness is 10 microns, and the drying temperature is 90° C.

[0052] Replace the conventional commercial diaphragm with a composite diaphragm, lithium iron phosphate as the positive electrode, graphite as the negative electrode, 1mol / L LiPF6+EC (ethylene carbonate) / DMC (dimethyl carbonate) / EMC (ethyl methyl carbonate) (volume ratio of 1 : 1: 1) is the electrolyte...

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Abstract

The invention discloses polyolefin lithium battery diaphragm coating slurry, which is prepared by a coating material, a binder and deionized water, wherein the coating material is composed of one or more of graphene coated Al2O3 powder, carbon nanotubes, graphene and graphite according to any proportion; the binder is composed of one or two of sodium alginate, carboxymethylcellulose sodium, styrene butadiene rubber and polyvinylidene fluoride according to any proportion; the mass ratio of the coating material and the binder is 10:(0.01-1), the balance is the deionized water, and the mass fraction of the coating material in the polyolefin lithium battery diaphragm coating slurry is 0.1-30%. The invention further discloses a method of coating a polyolefin lithium battery diaphragm by using the polyolefin lithium battery diaphragm coating slurry. The coating slurry takes water as a solvent, and has the advantages of low cost, environment friendliness, controllable viscosity of the coatingslurry and good wettability and dispersion of the coating slurry. The method of the invention is simple in preparation process, low in cost and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery manufacturing, in particular to a polyolefin lithium battery separator coating slurry and a method for coating the polyolefin lithium battery separator with the coating slurry. Background technique [0002] In the structure of lithium batteries, the separator is one of the important components, and its role is to separate the positive and negative electrode materials as an insulating lithium ion channel. During the charging and discharging process of the battery, lithium ions pass through the separator back and forth, so the performance of the separator directly affects the cycle performance and safety performance of the battery. [0003] At present, commercialized lithium battery separators are mainly polyolefin separators based on polyethylene and polypropylene, including single-layer PP separators, single-layer PE separators and multilayer PP / PE / PP composite separators. Polyolefin ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/431H01M50/449Y02E60/10
Inventor 刘剑洪张汉平刘金鑫李芳黄少銮张黔玲何传新张小勇孔金丽欧阳晓平王林林光证
Owner SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD
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