A cluster 4-methyl-1-lithium-ion battery diaphragm and its preparation method

A technology of lithium pentene and methyl group is applied in the field of preparation of diaphragms with simple processing procedures, which can solve problems such as poor heat resistance and achieve the effects of mature procedures, good aging resistance and overcoming adhesion.

Active Publication Date: 2018-09-18
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For overcoming the shortcoming of polyolefin, particularly polypropylene and polyethylene lithium-ion battery diaphragm poor heat resistance, provide a kind of high heat-resistant poly 4-methyl-1-pentene lithium ion battery diaphragm, another aspect of the present invention The purpose is to provide a membrane preparation method with simple processing procedures

Method used

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  • A cluster 4-methyl-1-lithium-ion battery diaphragm and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Accurately weigh poly-4-methyl-1-pentene: 100kg, antioxidant 1010: 0.3kg, nucleating agent 0.5kg, slip agent 0.5 parts, plasticizer 10 parts. Precursor film A is prepared by casting in a casting system, extruder temperature: 300°C, die head temperature: 250°C, casting roll temperature: 160°C, die opening: 1.0mm, cast film thickness: 18.5um , Rewinding length: 1000m.

[0032] Put the precursor film A into a constant temperature oven for heat treatment, heat treatment temperature: 180°C, heat treatment time: 5 hours.

[0033] The heat-treated precursor film A was stretched to prepare a lithium-ion battery separator with a stretching ratio of 2.2, a stretching temperature of 190°C, and a setting temperature of 215°C.

Embodiment 2

[0035]Accurately weigh poly-4-methyl-1-pentene: 100kg, antioxidant 1010: 0.5kg, nucleating agent 5kg, slip agent 10 parts, plasticizer 10 parts. Precursor film A is prepared by casting in a casting system, extruder temperature: 300°C, die head temperature: 250°C, casting roll temperature: 160°C, die opening: 1.0mm, cast film thickness: 18.5um , Rewinding length: 1000m.

[0036] Put the precursor film A into a constant temperature oven for heat treatment, heat treatment temperature: 180°C, heat treatment time: 5 hours.

[0037] The heat-treated precursor film A was stretched to prepare a lithium-ion battery separator with a stretching ratio of 2.2, a stretching temperature of 190°C, and a setting temperature of 215°C.

Embodiment 3

[0039] Accurately weigh poly-4-methyl-1-pentene: 100kg, antioxidant 1010: 0.05kg, nucleating agent 0.05kg, slip agent 0.01 part, plasticizer 1 part. Precursor film A is prepared by casting in a casting system, extruder temperature: 300°C, die head temperature: 250°C, casting roll temperature: 160°C, die opening: 1.0mm, cast film thickness: 18.5um , Rewinding length: 1000m.

[0040] Put the precursor film A into a constant temperature oven for heat treatment, heat treatment temperature: 180°C, heat treatment time: 5 hours.

[0041] The heat-treated precursor film A was stretched to prepare a lithium-ion battery separator with a stretching ratio of 2.2, a stretching temperature of 190°C, and a setting temperature of 215°C.

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Abstract

The invention discloses a poly-4-methyl-1-pentene lithium-ion battery diaphragm and a preparation method thereof, which comprises poly-4-methyl-1-pentene homopolymer, poly-4-methyl-1-pentene Copolymers of structural units, antioxidants, slip agents, plasticizers and nucleating agents, etc. The invention also discloses a preparation method for processing poly-4-methyl-1-pentene lithium-ion battery diaphragm by using the raw material, comprising the following steps: Step 1: mixing poly-4-methyl-1-pentene, antioxidant, Smooth agent, plasticizer, nucleating agent and other additives are stirred evenly by a stirring mixer to obtain mixture I; step 2: adding mixture I to an extrusion casting system for casting to prepare a precursor film; step 3: Put the obtained precursor film into a constant temperature oven for annealing treatment; Step 4: longitudinally stretch the annealed precursor film to prepare a separator with a microporous structure. The diaphragm prepared by the invention has good heat resistance, low cost and simple processing procedure.

Description

technical field [0001] The invention relates to a lithium ion battery diaphragm, in particular to a poly 4-methyl-1-pentene lithium ion battery diaphragm and a method for preparing the diaphragm with simple processing procedures. Background technique [0002] Lithium-ion batteries are widely used in digital products, electric tools, electric vehicles and other fields because of their advantages such as high cell voltage, high specific energy and small self-discharge. At present, most of the separators of commercial lithium-ion batteries are made of PP or PE, which are prepared by unidirectional or biaxial stretching. However, due to the poor heat resistance of polyolefin materials, it has a certain impact on the safety of lithium-ion batteries, which also restricts the development of related industries to a certain extent. [0003] Poly-4-methyl-1-pentene (PMP) has been widely used as a gas separation membrane with excellent performance in chemical industry, environmental p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/20C08L83/04C08K5/134C08K5/053C08K5/12H01M2/16H01M2/14B29C69/00B29C47/92B29C55/06B29C48/92H01M50/403H01M50/414H01M50/449H01M50/494
CPCC08L23/20B29C48/001B29C48/0018B29C48/92B29C55/06C08L2203/20B29C2948/92704B29C2948/92904H01M50/403H01M50/411C08L83/04C08K5/1345C08K5/053C08K5/12Y02E60/10
Inventor 黄恩德陈秀峰
Owner SHENZHEN SENIOR TECH MATERIAL
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