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Method of preparing PP/PA66 composite battery separator

A PA66, composite battery technology, used in secondary batteries, battery pack parts, circuits, etc., can solve the problems of poor heat resistance of PP separators, and achieve the advantages of increasing polarity and strength, improving adhesion and improving dispersion. Effect

Active Publication Date: 2019-06-07
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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  • Method of preparing PP/PA66 composite battery separator
  • Method of preparing PP/PA66 composite battery separator

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 preparation of lithium ion battery separators, and in particular relates to a method of preparing a PP / PA66 composite battery separator. Alpha-methyl styrene (AMS), N-phenylmaleimide (NPMI) and glycidyl methacrylate (GMA) are firstly used for copolymerization to prepare a macroinitiator PANG; the prepared PANG and PP are subjected to melt blending to prepare aPP-g-PANG graft copolymer, and the graft copolymer can be used as a compatibilizer for the PP / PA66 system and can effectively improve the heat resistance of the composit.; a PP / PA66 compatibilized blend is prepared by adopting a melt blending method; and a cast base film is prepared by the compatibilized blend, and a composite battery separator is prepared through a uniaxial tension process. Compared with the PP separator, the PP / PA66 composite battery separator prepared in the invention obtains effective improvement on heat resistance and hydrophilicity.

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 Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCY02E60/10
Inventor 蒋姗谢聪陈伟俞强丁永红张洪文
Owner CHANGZHOU UNIV
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