Lithium ion battery diaphragm and lithium ion battery containing same

A technology for lithium ion batteries and separators, applied in the directions of separators/films/diaphragms/spacers, secondary batteries, battery pack components, etc. Large swelling degree and other problems, to achieve the effect of reducing battery polarization, improving safety risks, and good bonding effect

Pending Publication Date: 2019-12-10
惠州锂威新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing lithium-ion battery separators use fully-coated rubber-coated separators, and the swelling degree of the organic glue material is relatively large (EC/PC/DEC=1:1:1 60°C 10day, swelling degree>1000% ), it is very eas

Method used

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  • Lithium ion battery diaphragm and lithium ion battery containing same
  • Lithium ion battery diaphragm and lithium ion battery containing same
  • Lithium ion battery diaphragm and lithium ion battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1

[0038] Preparation of positive electrode sheet:

[0039] Lithium cobaltate, conductive agent superconducting carbon (Super-P), and binder polyvinylidene fluoride (PVDF) were mixed uniformly at a mass ratio of 97:1.5:1.5 to make a lithium-ion battery cathode slurry with a certain viscosity. The slurry is coated on the aluminum foil of the current collector, and then cold pressed after drying at 85°C; then edge trimming, cutting, and slitting are performed, and after slitting, dry at 110°C for 4 hours under vacuum conditions, and weld the tabs. Made into lithium-ion battery cathode sheet.

[0040] Preparation of negative electrode sheet:

[0041] Make a slurry of graphite and conductive agent superconducting carbon (Super-P), thickener sodium carboxymethyl cellulose (CMC), and binder styrene-butadiene rubber (SBR) at a mass ratio of 96:2.0:1.0:1.0 , coated on the current collector copper foil and dried at 85°C, trimmed, cut into pieces, slitting, and dried ...

Example Embodiment

[0050] Example 2

[0051] Different from Example 1 is the preparation of diaphragm:

[0052] 1) Take a polyethylene microporous membrane with a thickness of 12 μm, a porosity of 45%, and a pore diameter of 90 nm as the base membrane;

[0053] 2) attaching an acrylic modified polyolefin coating with a thickness of 15nm in the pores of the base film by dip coating;

[0054] 3) Coating a ceramic layer on the surface of the base film by gravure roll coating to obtain a heat-resistant composite substrate layer;

[0055] 4) Coating one side of the heat-resistant composite substrate layer with a thickness of 0.5 μm and an area density of 1.2 g / m by gravure roller coating 2 The first organic glue coating; The polymer contained in the first organic glue coating is polymethyl methacrylate with swelling degree less than 300%; The first organic glue coating is sequentially from the upper edge to the lower edge of the base film Including the first complete coating area, the lattice inte...

Example Embodiment

[0058] Example 3

[0059] Different from Example 1 is the preparation of diaphragm:

[0060] 1) Take a polyethylene microporous membrane with a thickness of 12 μm, a porosity of 45%, and a pore diameter of 90 nm as the base membrane;

[0061] 2) attaching an acrylic modified polyolefin coating with a thickness of 15nm in the pores of the base film by dip coating;

[0062] 3) Coating a ceramic layer on the surface of the base film by gravure roll coating to obtain a heat-resistant composite substrate layer;

[0063] 4) Coating one side of the heat-resistant composite substrate layer with a thickness of 0.5 μm and an area density of 1.2 g / m by gravure roller coating 2 The first organic glue coating; The polymer contained in the first organic glue coating is polymethyl methacrylate with swelling degree less than 300%; The first organic glue coating is sequentially from the upper edge to the lower edge of the base film Including the first complete coating area, the lattice inte...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery diaphragm and a lithium ion battery containing the same. The lithium ion battery diaphragm comprises a heat-resistant composite base material layer. A first organic adhesive coating is arranged on one side of the heat-resistant composite base material layer. The heat-resistant composite base material layer comprises a base film and a ceramic layer arranged on the surface of the base film. The base film is provided with a plurality of pores, and a modified polyolefin coatingis attached to the pores. The first organic adhesive coating sequentially comprises a first complete coating area, a plaid intermittent coating area and a second complete coating area from the upper edge to the lower edge of the base film. Compared with the prior art, the lithium ion battery diaphragm can be fully infiltrated by the electrolyte and battery polarization can be reduced while good bonding performance and dimensional stability are achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery diaphragm and a lithium ion battery containing the diaphragm. Background technique [0002] Due to its high specific energy, no memory effect and excellent cycle life, lithium-ion batteries are widely used in various electronic devices such as digital cameras, mobile phones, tablet computers, and drones, and are constantly being used in the field of new energy vehicles. Development is an important driving force for the development of electrochemical energy storage devices. [0003] At present, commercial lithium-ion battery separators are mainly based on porous polyolefin membranes, which are coated with ceramic coatings and / or organic adhesive coatings to improve the mechanical strength, thermal dimensional stability and adhesion of the separator to the positive and negative electrodes. Therefore, when the battery is at a relative...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/18H01M2/14H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/463Y02E60/10
Inventor 官淑敏陈杰杨山李载波
Owner 惠州锂威新能源科技有限公司
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