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Multilayer composite aliphatic polyketone microporous membrane and preparation method thereof

An aliphatic polyketone and multi-layer composite technology, which is applied to structural parts, electrical components, battery pack parts, etc., can solve problems such as poor thermal dimensional stability at high temperature, low closed cell temperature of the isolation film, and increased safety hazards, etc. , achieve high membrane rupture temperature, closed cell temperature and high membrane rupture temperature, and improve safety

Active Publication Date: 2021-09-21
GUANGDONG UNIV OF TECH
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  • 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

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  • Multilayer composite aliphatic polyketone microporous membrane and preparation method thereof
  • Multilayer composite aliphatic polyketone microporous membrane and preparation method thereof
  • Multilayer composite aliphatic polyketone microporous membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides the first specific implementation scheme, and the steps are as follows:

[0051] 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 6g / 10min, and the melt index of polypropylene is 6g / 10min; the temperature of the multilayer die is 220°C.

[0052] The multi-layer composite cast film was heat-treated in a blast oven at 130° C. for 60 minutes to obtain a multi-layer composite heat-treated film. The multi-layer composite heat-treated film was thermally stretched at 145° C., the thermal stretch rate was 10 mm / min, and the the...

Embodiment 2

[0054] This embodiment provides the second specific implementation scheme, the steps are as follows:

[0055] 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 2g / 10min; the temperature of the multilayer die is 240°C.

[0056] 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 was thermally stretched at 145° C., the thermal stretch rate was 100 mm / min, and the thermal...

Embodiment 3

[0058] This embodiment provides a third specific implementation scheme, the steps are as follows:

[0059] 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 3g / 10min; the temperature of the multilayer die is 220°C.

[0060] The multilayer composite cast film was heat-treated in a blast oven at 145° C. for 30 minutes to obtain a multilayer composite heat-treated film. The multi-layer composite heat-treated film was thermally stretched at 145° C., the thermal stretch rate was 50 mm / min, and the thermal str...

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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 the 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 the 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, heat stretching and heat setting to obtain a multi-layer composite film. Aliphatic polyketone microporous membrane; the multi-layer 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 poor thermal dimensional stability at high temperature. The technical defect that the battery is easy to run and has potential safety hazards.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a 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, good micropore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/414H01M50/417H01M50/457H01M10/0525H01M50/483H01M50/491
CPCH01M10/0525H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 谢嘉宜徐睿杰雷彩红
Owner GUANGDONG UNIV OF TECH
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