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

A multi -layer composite aliposyone microphone film and its preparation method

An aliphatic polyketone, multi-layer composite technology, applied in structural parts, electrical components, battery pack parts and other directions, can solve the problems of poor thermal dimensional stability at high temperature, low closed-cell temperature of isolation film, and increased safety hazards. , to avoid dimensional shrinkage or film rupture, high closed cell temperature, and improve safety.

Active Publication Date: 2021-07-06
GUANGDONG UNIV OF TECH
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low melting point of the polyolefin material itself, the closed cell temperature of the isolation film obtained in the above patents is low, and the thermal dimensional stability at high temperatures is not good, which is more likely to increase safety hazards during battery operation.

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 multi -layer composite aliposyone microphone film and its preparation method
  • A multi -layer composite aliposyone microphone film and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This embodiment provides the first specific implementation scheme, and the steps are as follows:

[0056] Add polypropylene and aliphatic polyketone to different single-screw extruders for melting, and co-extrude and cast a film through a multi-layer die to obtain a multi-layer composite cast film, in which the aliphatic polyketone is located in the outer layer , polypropylene is located in the middle layer, and the structure of the multilayer composite cast film is aliphatic polyketone layer-polypropylene layer-aliphatic polyketone layer; the melt index of aliphatic polyketone is 5g / 10min, and the melt index of polypropylene is 5g / 10min; the temperature of the multilayer die is 210°C.

[0057] The multilayer composite cast film was heat-treated in a blast oven at 150° C. for 10 minutes to obtain a multilayer composite heat-treated film. The multi-layer composite heat-treated film is cold stretched at 20°C, the cold stretch rate is 50mm / min, and the cold stretch ratio ...

Embodiment 2

[0059] This embodiment provides the second specific implementation scheme, the steps are as follows:

[0060] Add polypropylene and aliphatic polyketone to different single-screw extruders for melting, and co-extrude and cast a film through a multi-layer die to obtain a multi-layer composite cast film, in which the aliphatic polyketone is located in the outer layer , polypropylene is located in the middle layer, and the structure of the multilayer composite cast film is aliphatic polyketone layer-polypropylene layer-aliphatic polyketone layer; the melt index of aliphatic polyketone is 2g / 10min, and the melt index of polypropylene is 1g / 10min; the temperature of the multilayer die is 240°C.

[0061] The multi-layer composite cast film was heat-treated in a blast oven at 140° C. for 60 minutes to obtain a multi-layer composite heat-treated film. The multi-layer composite heat-treated film is cold stretched at 20°C, the cold stretch rate is 10mm / min, and the cold stretch ratio i...

Embodiment 3

[0063] This embodiment provides a third specific implementation scheme, the steps are as follows:

[0064] Add polypropylene and aliphatic polyketone to different single-screw extruders for melting, and co-extrude and cast a film through a multi-layer die to obtain a multi-layer composite cast film, in which the aliphatic polyketone is located in the outer layer , polypropylene is located in the middle layer, and the structure of the multilayer composite cast film is aliphatic polyketone layer-polypropylene layer-aliphatic polyketone layer; the melt index of aliphatic polyketone is 3g / 10min, and the melt index of polypropylene is 2.5g / 10min; the temperature of the multilayer die is 220°C.

[0065] The multi-layer composite cast film was heat-treated in a blast oven at 155° C. for 10 minutes to obtain a multi-layer composite heat-treated film. The multi-layer composite heat-treated film is cold-stretched at 20°C, the cold-stretch rate is 100mm / min, and the cold-stretch ratio i...

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
melt flow indexaaaaaaaaaa
melt flow indexaaaaaaaaaa
membrane rupture temperatureaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of batteries, and in particular relates to a multilayer composite aliphatic polyketone microporous membrane and a preparation method thereof. The preparation method of a multi-layer composite aliphatic polyketone microporous membrane disclosed by the invention comprises the following steps: using three extrusion casting machines to respectively melt and extrude aliphatic polyketone and polypropylene to form a film, and pass through a multi-layer Die casting to obtain a multi-layer composite cast film, wherein the aliphatic polyketone is located in the outer layer, polypropylene is located in the middle layer, and the multi-layer composite cast film is sequentially subjected to heat treatment, cold stretching, hot stretching and thermal stretching. After shaping, a multilayer composite aliphatic polyketone microporous membrane is obtained; the multilayer composite aliphatic polyketone microporous membrane disclosed by the present invention can effectively solve the problem that the microporous isolation membrane in the prior art has low closed cell temperature and high temperature thermal dimension. Poor stability, technical defects that are easy to run on the battery and have potential safety hazards.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a multilayer composite aliphatic polyketone microporous membrane and a preparation method thereof. Background technique [0002] Polyolefin microporous membranes are widely used as separators in lithium-ion batteries, and separators are the core components of lithium-ion batteries, accounting for about 18-30% of the cost of lithium-ion batteries. The quality of its performance plays a vital role in the overall performance of lithium batteries, and it is also one of the key technologies restricting the development of lithium batteries. With the development of electronic products and the expansion of application fields, people's requirements for the performance of lithium batteries are also getting higher and higher. In order to meet the development requirements of lithium batteries, the separator should have high mechanical strength, excellent thermal stability, goo...

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): H01M50/403H01M50/414H01M10/0525H01M50/417H01M50/449
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 谢嘉宜陈加强徐睿杰雷彩红
Owner GUANGDONG UNIV OF TECH