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A kind of preparation method of pp/pa66 composite battery diaphragm

A technology of PA66 and composite batteries, which is applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems of poor heat resistance of PP separators, increase polarity and strength, facilitate diffusion, and improve adhesion Effect

Active Publication Date: 2021-06-22
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is: the disadvantage of poor heat resistance of traditional lithium-ion battery PP diaphragm

Method used

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  • A kind of preparation method of pp/pa66 composite battery diaphragm
  • A kind of preparation method of pp/pa66 composite battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1): Synthesis of PANG

[0032] Add azobisisobutyronitrile (AIBN) (mass accounts for 1 wt% of the total monomer mass), AMS, NPMI and GMA in a certain molar ratio (1:1:10) in the flask in sequence, and tetrahydrofuran (THF) is added to the flask In a nitrogen atmosphere, the reaction temperature is 65°C, the rotor speed is 300r / min, and the reaction time is ≥8h, the copolymer PANG is prepared by solution copolymerization.

[0033] (2): Preparation of PP-g-PANG graft

[0034]PP and PANG are dried and processed; after drying, they are mixed with antioxidant 1010 (the quality of PANG accounts for 5wt% of the total mass of PP, PANG and antioxidant 1010 mixed), and melted in a twin-screw extruder Blending and extrusion. The temperature from the hopper to the die of the extruder is as follows: the first to the fourth temperature section is 160-200°C, the fifth to the seventh temperature section is 200-220°C, the eighth to the ninth temperature section is 210-220°C, The die ...

Embodiment 2

[0040] Change the mass fraction ratio of PP, PP-g-PANG, and PA66 in Example 1 to: PP is 92.5wt%; PA66 is 5wt%; PP-g-PANG is 2.5wt%, and other conditions and steps are the same as in Example 1 .

Embodiment 3

[0042] Change the mass fraction ratio of PP, PP-g-PANG, and PA66 in Example 1 to: PP is 88.75wt%; PA66 is 7.5wt%; PP-g-PANG is 3.75wt%, and other conditions and steps are the same as in the example 1.

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Abstract

The invention relates to the field of lithium-ion battery diaphragm preparation, in particular to a preparation method of a PP / PA66 composite battery diaphragm. First utilize α-methylstyrene (AMS), N-phenylmaleimide (NPMI) and glycidyl methacrylate (GMA) to carry out copolymerization reaction and prepare macromolecular initiator PANG; The PANG that will make Melt blending with PP to prepare PP‑g‑PANG grafts, which can not only be used as a compatibilizer for PP / PA66 systems, but also effectively improve the heat resistance of composite materials; prepare PP / PA66 by melt blending PA66 compatibilized blend; the compatibilized blend was used to prepare casting base film and composite battery separator was prepared by uniaxial stretching process. Compared with the PP separator, the heat resistance and hydrophilicity of the PP / PA66 composite battery separator prepared according to the invention are effectively improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery diaphragm preparation, in particular to a preparation method of a PP / PA66 composite battery diaphragm material. Background technique [0002] Polypropylene (PP) has excellent mechanical properties, excellent corrosion resistance, electrical insulation, low density and low price. Therefore, PP has become one of the most widely used plastic varieties. The PP diaphragm has many advantages, such as simple production and low cost, so it is widely used in many places, such as lithium ion battery diaphragm, water environment purification, chemical refining industry and cloth industry. [0003] The advantage of using polypropylene as a raw material for lithium-ion battery separators is that polypropylene has excellent mechanical properties, stable chemical properties, electrical insulation, low price, easy processing, and is suitable for the preparation of separators, and there is no good polypropylene ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/414H01M50/44H01M50/489H01M50/491H01M10/0525
CPCY02E60/10
Inventor 蒋姗谢聪陈伟俞强丁永红张洪文
Owner CHANGZHOU UNIV
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