Biomass nanocrystal coated polyolefin lithium ion battery diaphragm and production method thereof

A technology of biomass nanocrystals and lithium-ion batteries, which is applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as low melting rupture temperature and poor wettability of electrolyte, and is easy to achieve consistency control , low loss, uniform coating thickness

Inactive Publication Date: 2015-10-21
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing polyolefin lithium-ion battery separator has a low melting and rupture t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A biomass nanocrystalline coated polyolefin lithium-ion battery separator, the separator comprising a polyolefin porous membrane and a biomass nanocrystalline coating layer on one or both sides of the polyolefin porous membrane;

[0029] The polyolefin porous membrane is a polyethylene diaphragm, a polypropylene diaphragm or a composite diaphragm of polyethylene and polypropylene, the thickness of the diaphragm is 4 μm, and the porosity is 35%;

[0030] The biomass nano crystal is cellulose nano crystal or chitin nano crystal, and the thickness of the biomass nano crystal coating layer is 1-2 μm. The biomass nano crystals in the biomass nano crystal coating layer have a diameter of 2-10 nanometers and a length of 20-50 nanometers.

[0031] The specific preparation method of this multilayer composite polyolefin lithium-ion battery diaphragm is as follows:

[0032] (1) Add biomass nanocrystals and water into a stirring tank and stir evenly to obtain a biomass nanocrystal...

Embodiment 2

[0036] A biomass nanocrystalline coated polyolefin lithium-ion battery separator, the separator comprising a polyolefin porous membrane and a biomass nanocrystalline coating layer on one or both sides of the polyolefin porous membrane;

[0037] The polyolefin porous membrane is a polyethylene diaphragm, a polypropylene diaphragm or a composite diaphragm of polyethylene and polypropylene, the thickness of the diaphragm is 10 μm, and the porosity is 70%;

[0038] The biomass nano crystal is cellulose nano crystal or chitin nano crystal, and the thickness of the biomass nano crystal coating layer is 5-8 μm. The biomass nano crystals in the biomass nano crystal coating layer have a diameter of 50-80 nanometers and a length of 150-200 nanometers.

[0039] The specific preparation method of this multilayer composite polyolefin lithium-ion battery diaphragm is as follows:

[0040] (1) Adding biomass nanocrystals and water into a stirring tank and stirring evenly to obtain a biomass ...

Embodiment 3

[0044] A biomass nanocrystalline coated polyolefin lithium-ion battery separator, the separator comprising a polyolefin porous membrane and a biomass nanocrystalline coating layer on one or both sides of the polyolefin porous membrane;

[0045] The polyolefin porous membrane is a polyethylene diaphragm, a polypropylene diaphragm or a composite diaphragm of polyethylene and polypropylene, the thickness of the diaphragm is 40 μm, and the porosity is 60%;

[0046] The biomass nano crystal is cellulose nano crystal or chitin nano crystal, and the thickness of the biomass nano crystal coating layer is 3-5 μm. The biomass nano crystals in the biomass nano crystal coating layer have a diameter of 20-40 nanometers and a length of 50-100 nanometers.

[0047] The specific preparation method of this multilayer composite polyolefin lithium ion battery separator is as follows:

[0048] (1) Adding biomass nanocrystals and water into a stirring tank and stirring evenly to obtain a biomass n...

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Abstract

The invention relates to the technical filed of polymer materials, and concretely relates to a biomass nanocrystal coated polyolefin lithium ion battery diaphragm and a production method thereof. The diaphragm comprises a polyolefin porous membrane and a biomass nanocrystal coating layer coated at one side or two sides of the polyolefin porous membrane, so the diaphragm greatly improves the melt fracture temperature and improves the safety of lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a biomass nanocrystal-coated polyolefin lithium-ion battery diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries have developed rapidly due to their excellent characteristics such as high working voltage, high energy density, long cycle life, light weight, small size and no pollution, and have become the main power source of various electronic products. They have been widely used in mobile phones, portable In the field of electronic products such as computers, cameras, and video cameras, it can also be used as a power source for electric vehicles and hybrid vehicles. In the structure of lithium batteries, the diaphragm is one of the key inner components. The performance of the diaphragm directly affects the capacity, cycle performance and safety performance of the battery. A diaphragm with excellent performance plays a very imp...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/40H01M50/403H01M50/417
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 王宗宝
Owner NINGBO UNIV
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