Lithium ion battery diaphragm with high electrolyte wettability and preparation method of lithium ion battery diaphragm

A technology of lithium-ion batteries and ion batteries, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of poor electrolyte wettability and wrinkles, prevent the diaphragm from wrinkling, reduce the risk of short circuit, and improve The effect of wetting speed

Inactive Publication Date: 2019-05-10
JIANGSU ANREDA NEW MATERIAL
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion battery separator to solve the problem of wrinkles caused by poor electrolyte wettability

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium ion battery diaphragm with high electrolyte wettability and preparation method of lithium ion battery diaphragm
  • Lithium ion battery diaphragm with high electrolyte wettability and preparation method of lithium ion battery diaphragm
  • Lithium ion battery diaphragm with high electrolyte wettability and preparation method of lithium ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 As shown, this embodiment 1 provides a lithium ion battery separator, comprising: a polyolefin microporous membrane substrate 1 , and a lipophilic polymer coating 2 coated on the surface of the polyolefin microporous membrane substrate 1 .

[0023] Optionally, the lipophilic polymer coating is a mixed liquid suitable for coating and curing on the surface of the polyolefin microporous membrane substrate. And the mode of described coating comprises: any one in dipping, spraying, roll coating; The mode of described curing comprises: any one in ultraviolet light irradiation, heat treatment, to improve lipophilic polymer coating and poly Olefin Microporous Membrane Matrix Bonding Degree.

[0024] The lithium-ion battery diaphragm of this embodiment 1 can greatly increase the wetting speed of the electrolyte to the diaphragm by coating a layer of lipophilic polymer coating on the surface of the polyolefin microporous membrane substrate, and improve the wetti...

Embodiment 2

[0039] On the basis of Example 1, this Example 2 provides a preparation method of a lithium-ion battery separator, including: preparing a cast cast sheet through a polyolefin resin; coating the lipophilic polymer coating on the cast cast and solidify on the sheet to prepare a polyolefin intermediate film; pre-laminate multiple polyolefin intermediate films to prepare a polyolefin pre-laminated film group; further bond multiple polyolefin pre-laminated film groups, Forming the laminated polyolefin intermediate film layer; performing recrystallization annealing treatment; and longitudinal stretching to prepare the lithium ion battery separator.

[0040] Generally, in the production process of lithium-ion battery separators, in order to increase production capacity and reduce production costs, multi-layer polyolefin cast sheets are often stretched at the same time, which involves wrinkles when laminating the multi-layer cast sheets question. The root cause of wrinkles is mostly ...

Embodiment 3

[0044] On the basis of Example 2, this Example 3 provides the first optional implementation of preparing lithium-ion battery separator, as follows:

[0045] (1) The polypropylene microporous membrane is melt-extruded to prepare a casting sheet, and the melt-extrusion temperature is 180°C-260°C.

[0046] (2) Methyl methacrylate, vinylpyrrolidone, dibenzoyl peroxide and cross-linking agent are formulated into a mixed liquid in a mass ratio of 5:75:0.05:0.1, and are coated by dipping, spraying or roller coating The process is sprayed on the casting sheet, and then cross-linked and cured by ultraviolet light irradiation or heat treatment, so that the surface is covered with a layer of lipophilic polymer coating; among them, allyl methacrylate and ethylene glycol in the cross-linking agent The mass ratio of dimethacrylate is 5:1.

[0047] (3) The polyolefin intermediate film is pre-laminated every 2-6 layers through a composite process to prepare a polyolefin pre-laminated film gr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
pore sizeaaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the field of lithium ion battery diaphragms, and particularly relates to a lithium ion battery diaphragm with high electrolyte wettability and a preparation method of the lithium ion battery diaphragm. The lithium ion battery diaphragm comprises a polyolefin microporous membrane matrix, and a lipophilic polymer coating covering the surface of the polyolefin microporous membrane matrix, wherein the wetting speed of the electrolyte on the diaphragm is greatly increased, the wetting uniformity of the electrolyte on the diaphragm is improved, the diaphragm wrinkling causedby poor electrolyte wetting in a lithium ion battery assembling process is prevented, and the risk of short circuit of a lithium ion battery is reduced.

Description

technical field [0001] The invention relates to the field of lithium-ion battery separators, in particular to a lithium-ion battery separator with high electrolyte wettability and a preparation method thereof. Background technique [0002] In recent years, under the continuous policy guidance and support of the governments of various countries, the global new energy vehicle industry has developed rapidly, and the domestic new energy vehicle industry has shown explosive growth. The rapid expansion of the new energy vehicle industry will directly drive the rapid growth of demand for lithium-ion batteries. In 2017, the domestic demand reached 37GWh, and by 2020 the demand for lithium-ion batteries will reach 122.1GWh. The rapid development of the lithium-ion battery market has driven the market demand for separators, and at the same time put forward higher requirements for separators. [0003] The lithium-ion battery separator is located between the positive and negative elect...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/414H01M50/449H01M50/489H01M50/586
CPCY02E60/10
Inventor 张建朋王维马洁宁景霞景小云
Owner JIANGSU ANREDA NEW MATERIAL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap