Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of multi-layer composite polyolefin lithium-ion battery diaphragm and preparation method thereof

A lithium-ion battery and composite polyolefin technology, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problem of low melting and rupture temperature of the separator, and achieve easy control of porosity, tight bonding, and enhanced bond strength Effect

Active Publication Date: 2017-12-05
NINGBO UNIV
View PDF5 Cites 0 Cited by
  • 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 melting and rupture temperature of the existing polyethylene lithium-ion battery separator is not high, and to provide a multi-layer composite polyolefin lithium-ion battery separator and its preparation method

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
  • A kind of multi-layer composite polyolefin lithium-ion battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of a multilayer composite polyolefin lithium-ion battery separator, the thickness of which is 6 μm; specifically comprising the following steps:

[0043] (1) Extrusion: Add polyethylene resin, polyethylene polypropylene block copolymer resin and additives into the solvent to prepare a uniform suspension, and then add this suspension to a twin-screw extruder to obtain a high-temperature melt A; Add polypropylene resin and additives to the solvent to prepare a uniform suspension, and then add this suspension to the twin-screw extruder to obtain high-temperature melt B; pass the two melts through the melt metering pump and then enter the composite Convergence and co-extrusion in the slit die head, the composite jelly film was obtained by polishing the cold roll; the concentrations of the two suspensions were 10% respectively, the temperature of the twin-screw extruder was 200 ° C, and the temperature of the polishing cold roll was 60°C; add 0.1g of oth...

Embodiment 2

[0048] A preparation method of a multilayer composite polyolefin lithium-ion battery diaphragm, the thickness of which is 40 μm; specifically comprising the following steps:

[0049] (1) Extrusion: Add polyethylene resin, polyethylene polypropylene block copolymer resin and additives into the solvent to prepare a uniform suspension, and then add this suspension to a twin-screw extruder to obtain a high-temperature melt A; Add polypropylene resin and additives to the solvent to prepare a uniform suspension, and then add this suspension to the twin-screw extruder to obtain high-temperature melt B; pass the two melts through the melt metering pump and then enter the composite Convergence and co-extrusion in the slit die head, the composite jelly film was obtained by polishing the cold roll; the concentrations of the two suspensions were 30% respectively, the temperature of the twin-screw extruder was 260 ° C, and the temperature of the polishing cold roll was 20°C; add 3 grams of...

Embodiment 3

[0054] A preparation method of a multilayer composite polyolefin lithium-ion battery diaphragm, the thickness of which is 20 μm; specifically comprising the following steps:

[0055] (1) Extrusion: Add polyethylene resin, polyethylene polypropylene block copolymer resin and additives into the solvent to prepare a uniform suspension, and then add this suspension to a twin-screw extruder to obtain a high-temperature melt A; Add polypropylene resin and additives to the solvent to prepare a uniform suspension, and then add this suspension to the twin-screw extruder to obtain high-temperature melt B; pass the two melts through the melt metering pump and then enter the composite Convergence and co-extrusion in the slit die head, the composite jelly film was obtained by polishing the cold roll; the concentrations of the two suspensions were 40% respectively, the temperature of the twin-screw extruder was 160 ° C, and the temperature of the polishing cold roll was 40°C; add 5 grams of...

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
strengthaaaaaaaaaa
temperatureaaaaaaaaaa
Login to View More

Abstract

The invention relates to the field of polymer materials, in particular to a multilayer composite polyolefin lithium-ion battery diaphragm and a preparation method thereof. The lithium-ion battery separator is a multi-layer composite film structure, which is successively a polypropylene layer, a polyethylene-polypropylene block copolymer resin layer, a polyethylene layer, a polyethylene-polypropylene block copolymer resin layer, and a polypropylene layer. The lithium-ion battery The thickness of the separator is 6-40 μm, and the thickness ratio of each layer is 2-6:1:2-6:1:2-6. The multi-layer composite polyolefin lithium-ion battery separator of the present invention is prepared by a thermally induced phase separation method, with uniform pore size and easy control of porosity; its melting and rupture temperature is higher than that of ordinary polyethylene separators by more than 15°C, which improves the safety of lithium-ion batteries sex.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a multilayer composite 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 important role in i...

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 Patents(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/414
CPCH01M50/403H01M50/411Y02E60/10
Inventor 王宗宝
Owner NINGBO UNIV