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Production method of cross-linked polyethylene lithium ion battery diaphragm

A lithium-ion battery and cross-linked polyethylene technology, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of low melting rupture temperature and insufficient puncture strength performance, and achieve low modification cost and easy continuous The effect of preparing and increasing the piercing strength

Active Publication Date: 2015-10-21
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of a cross-linked polyethylene lithium-ion battery separator in order to solve the problems of insufficient puncture strength performance and low melting rupture temperature of the existing polyethylene lithium-ion battery separator

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method of a cross-linked polyethylene lithium-ion battery separator, specifically comprising the following steps:

[0033] (1) Extrusion film making: Add polyethylene resin and additives into the solvent, mix well to prepare a suspension, then add the suspension to a twin-screw extruder to obtain a high-temperature melt, and then pass through a metering pump and Extrude through a slot die, and obtain a jelly film by polishing cold rolls; wherein: the mass concentration of the suspension is 10%, the temperature of the twin-screw extruder is 260 ° C, and the temperature of the polishing cold rolls is 20 ° C; Said solvent is paraffin oil or white oil; Polyethylene resin is the mixture of ultra-high molecular weight polyethylene and high-density polyethylene, and the weight ratio of ultra-high molecular weight polyethylene and high-density polyethylene is 1:5; In every kilogram of polyethylene resin Add 0.1 g of additives, which are one or more of antioxidants...

Embodiment 2

[0046] A preparation method of a cross-linked polyethylene lithium-ion battery separator, specifically comprising the following steps:

[0047] (1) Extrusion film making: Add polyethylene resin and additives into the solvent, mix well to prepare a suspension, then add the suspension to a twin-screw extruder to obtain a high-temperature melt, and then pass through a metering pump and Extrude through a slot die, and obtain a jelly film by polishing cold rolls; wherein: the mass concentration of the suspension is 40%, the temperature of the twin-screw extruder is 160 ° C, and the temperature of the polishing cold rolls is 60 ° C; The solvent is paraffin oil or white oil; the polyethylene resin is a mixture of ultra-high molecular weight polyethylene and high-density polyethylene, and the weight ratio of ultra-high molecular weight polyethylene and high-density polyethylene is 1:2; Add 5 grams of additives, which are one or more of antioxidants, heat stabilizers and lubricants;

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PUM

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Abstract

The invention relates to the field of polymer materials, and concretely relates to a production method of a cross-linked polyethylene lithium ion battery diaphragm. The method comprises the following steps: extruding to make a membrane, stretching the membrane, extracting a solvent in the membrane, drying, and fixing and cross-linking by using a cross-linking agent in the membrane. The method allows modifier molecules to extremely easily enter the diaphragm, so the long-time processing process of modification of the finished polyethylene diaphragm is omitted, and the method has the advantages of simple process and convenience in operation.

Description

Technical field [0001] The invention relates to the field of polymer materials, and in particular to a method for preparing a cross-linked polyethylene lithium ion battery separator. Background technique [0002] Lithium-ion batteries have developed rapidly due to their excellent characteristics such as high operating 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 camcorders, it can also be used as a power source for electric vehicles and hybrid vehicles. In the structure of lithium batteries, the separator is one of the key inner components. The performance of the separator directly affects the battery's capacity, cycle performance, safety performance and other characteristics. An excellent separator plays a very important role in improving th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14B29D7/01B29K23/00B29K105/24H01M50/403
CPCB29D7/01B29K2023/0691B29L2031/3468B29K2105/24H01M50/403Y02E60/10
Inventor 王宗宝
Owner NINGBO UNIV
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