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Three-layer co-extrusion diaphragm with high heat resistance and high strength and preparation method of three-layer co-extrusion diaphragm

A three-layer co-extrusion, high-strength technology, used in structural parts, electrical components, battery pack parts, etc., can solve the problems of small temperature difference, poor heat resistance, low mechanical strength, etc., to improve mechanical strength and improve safety. properties, and the effect of improving heat resistance

Active Publication Date: 2022-07-22
NINGBO CHANGYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems of poor heat resistance, small temperature difference between closed cell temperature and rupture temperature, and low mechanical strength of the existing multi-layer co-extruded diaphragm, the present invention provides a three-layer co-extruded film with high heat resistance and high strength. Extruded diaphragm and method for preparing the same

Method used

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  • Three-layer co-extrusion diaphragm with high heat resistance and high strength and preparation method of three-layer co-extrusion diaphragm

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0041] The initiation temperature of the high-temperature initiator is not higher than the highest temperature in the three-layer co-extrusion process. As a specific embodiment, the high temperature initiator includes 2,3-dimethyl-2,3-diphenylbutane.

[0042] The melt flow rate of the polyethylene is 0.8-4.0 g / 10min, and the melting point is >130°C.

[0043] The weight average molecular weight of the polyethylene glycol is 400-1000.

[0044] A preparation method of the above-mentioned diaphragm, comprising the following steps:

[0045] S1: Mix all the raw materials of the upper layer and the lower layer at 10~33°C at a stirring speed of 100~300r / min for 0.5~1.5h to obtain a surface layer mixture; mix all the raw materials of the middle layer at 10~33°C with a stirring speed of 100~300r / min The stirring speed of / min is mixed for 0.5~1.5h to obtain the intermediate layer mixture;

[0046] S2: After the surface layer mixture and the middle layer mixture are melted at 260~285°...

Embodiment 1

[0051] Through the following steps, a three-layer co-extruded membrane with high heat resistance and high strength is prepared:

[0052] S1: Weigh the following raw materials in parts by weight: 45 parts of polyethylene terephthalate (melt flow rate is 1.2g / 10min, melting point 250°C), 50 parts of polyethylene glycol (weight average molecular weight is 500) , 5 parts of polyethylene glycol methyl ether methacrylate (weight average molecular weight is 730), 0.015 part of 2,3-dimethyl-2,3-diphenylbutane; The stirring speed of / min was mixed for 1 h to obtain the surface layer mixture;

[0053] S2: Weigh the following raw materials in parts by weight: 46 parts of polyethylene (melt flow rate is 2.0g / 10min, melting point 130°C), 50 parts of polyethylene glycol (weight average molecular weight is 500), polyethylene glycol methyl ether 4 parts of methacrylate (weight average molecular weight is 730), 0.012 part of 2,3-dimethyl-2,3-diphenylbutane; the above raw materials were mixed ...

Embodiment 2

[0060] The only difference between this embodiment and Embodiment 1 is that, in step S3, the weight ratio of the inner layer: the middle layer: the outer layer is changed to 15:70:15.

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Abstract

The invention relates to the field of battery multi-layer composite diaphragms, and discloses a high-heat-resistance and high-strength three-layer co-extrusion diaphragm and a preparation method thereof. In the diaphragm, the upper layer and the lower layer are prepared from the following raw materials: a polymer matrix, a macromonomer and a high-temperature initiator; the middle layer is prepared from the following raw materials: polyethylene, a macromonomer and a high-temperature initiator; the polymer matrix comprises one or more of polyethylene glycol terephthalate, polybutylene terephthalate and poly (ethylene 2, 6-naphthalate); the macromonomer comprises one or more of polyethylene glycol methyl ether methacrylate, poly (ethylene glycol) methacrylate and poly (ethylene glycol) ether methacrylate. The specific matrix is adopted in the three layers, the special macromonomer is introduced, and a three-layer co-extrusion process is matched, so that the temperature difference between the pore closing temperature and the membrane breaking temperature of the diaphragm can be increased, and the diaphragm is endowed with relatively good mechanical strength, heat resistance, liquid absorption capacity and ionic conductivity.

Description

technical field [0001] The invention relates to the field of battery multi-layer composite diaphragms, in particular to a three-layer co-extrusion diaphragm with high heat resistance and high strength and a preparation method thereof. Background technique [0002] The separator plays an important role in the battery device, serving as a physical barrier to avoid direct contact between the positive and negative electrodes, and to accommodate the electrolyte to facilitate the shuttle of ions. The main performance requirements of the diaphragm are: thickness uniformity, mechanical properties, air permeability and physical and chemical properties (wettability, chemical stability, thermal stability, safety, etc.). The technology of a new generation of high-rate, high-safety batteries has put forward higher requirements for the separator. [0003] The high-rate charge-discharge performance of a battery is closely related to the mobility of lithium ions in electrodes, electrolytes...

Claims

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Application Information

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IPC IPC(8): H01M50/457H01M50/414H01M50/403H01M50/489H01M50/494
CPCH01M50/457H01M50/414H01M50/403H01M50/489H01M50/494
Inventor 田慧婷王绪张文浩范建国杨雄
Owner NINGBO CHANGYANG TECH
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