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High-temperature-resisting composite isolation film and preparation method thereof

A separator and high-temperature-resistant technology, which is applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problems of lithium battery thermal runaway, poor high-temperature resistance of the separator, etc., to achieve convenient processing, maintain dimensional stability and The effect of mechanical strength and uniform pore size distribution

Active Publication Date: 2012-10-24
HANGZHOU FUMO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of poor high temperature resistance of the separator of the existing lithium ion battery, which may lead to thermal runaway of the lithium battery, and to provide a high temperature resistant composite separator, which can withstand a high temperature of 250°C, and is especially suitable for Used in lithium-ion batteries, also suitable as separator in other chemistries for accumulators and supercapacitors

Method used

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  • High-temperature-resisting composite isolation film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0056] (1) Preparation of mother liquor for film casting: 30kg of pure polyphenylene sulfide resin, 39.7kg of latent solvent (terephthalates: diisooctyl terephthalate), 39.7kg of ultrafine filler ( Precipitated white carbon black (particle size less than 100nm) 30kg, heat stabilizer 0.2kg and antioxidant 0.1kg are melted and mixed, and the polyphenylene sulfide casting film mother liquor is extruded, and the extrusion temperature is about 320°C;

[0057] (2) Casting film formation: The gear pump is used to pressurize the polyphenylene sulfide casting film mother liquor, and the pressurized polyphenylene sulfide casting film mother liquor passes through a T-shaped mouth film and is cast to the first casting steel roller (The temperature of the first casting steel roll is controlled at 25°C), and then cooled and shaped by the stretching roll (the temperature of the stretching roll is controlled at 25°C) and the shaping roll (the temperature is controlled at 25°C) to obtain polyph...

Embodiment 2

[0061] (1) Preparation of casting film mother liquor: use a twin-screw extruder to mix 69.3kg of pure polyphenylene sulfide resin + modifier (the modifier is a blended modified material: polyethylene terephthalate, of which The mass fraction of polyphenylene sulfide is 80% or 55.44kg, the mass fraction of the blended modified material is 20% or 13.86kg), latent solvent (terephthalates: diisooctyl terephthalate) 20kg 1. Ultrafine filler (nano-calcium carbonate, particle size less than 100nm) 10kg, heat stabilizer 0.5kg and antioxidant 0.2kg are melted and mixed, and the polyphenylene sulfide casting film mother liquor is extruded, and the extrusion temperature is about 300°C;

[0062] (2) Casting film formation: The gear pump is used to pressurize the polyphenylene sulfide casting film mother liquor, and the pressurized polyphenylene sulfide casting film mother liquor passes through a T-shaped mouth film and is cast to the first casting steel roller (The temperature of the firs...

Embodiment 3

[0066] (1) Preparation of casting film mother liquor: Use a twin-screw extruder to mix 50kg of polyphenylene sulfide pure resin + modifier (the modifier is a blended modified material: polyamide 1010, where the mass fraction of polyphenylene sulfide 95% or 47.5kg, the mass fraction of the blended modified material is 5% or 2.5kg), latent solvent (diisooctyl phthalate 10kg + dicyclohexyl phthalate 10kg + benzil 14.5 kg) 34.5kg, superfine filler (nano-calcium carbonate, particle size less than 100nm) 15kg, heat stabilizer 0.3kg and antioxidant 0.2kg for melt mixing, extrude polyphenylene sulfide casting film mother liquor, extrusion temperature is about 300°C;

[0067] (2) Casting film formation: The gear pump is used to pressurize the polyphenylene sulfide casting film mother liquor, and the pressurized polyphenylene sulfide casting film mother liquor passes through a T-shaped mouth film and is cast to the first casting steel roller (The temperature of the first casting steel ...

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Abstract

The invention discloses a high-temperature-resisting composite isolation film which is suitable to be used as an isolation film in a lithium ion battery, and a preparation method thereof. The invention aims at solving the problem in the existing lithium ion battery that the isolation film has poor high-temperature resistance, so that thermo-runaway can occur. The high-temperature-resisting composite isolation film provided by the invention is prepared through dry compound of a polyphenylene sulfide film and a polyolefin micro-porous film. A polyphenylene sulfide film-casting mother liquor is subjected to on-line extrusion and film casting; an obtained film is subjected to dry compound with the polyolefin micro-porous film; and an obtained composite film is subjected to extraction, washing, and drying, such that the high-temperature-resisting composite isolation film is prepared. The high-temperature-resisting composite isolation film provided by the invention can resist a high temperature of 250 DEG C. The film is especially suitable to be applied in lithium ion batteries, and is suitable to be applied as an isolation film in other chemical storage batteries and super-capacitors.

Description

technical field [0001] The invention relates to the technical field of preparation of special membranes, in particular to a high-temperature-resistant composite isolation membrane suitable for use as an isolation membrane in lithium-ion batteries and a preparation method thereof. Background technique [0002] With the development of the new energy industry, various new energy sources have been effectively developed, such as solar energy, wind energy, and biomass energy. It is not difficult to imagine that the commercial development of these new energy sources has put forward higher and higher requirements for energy storage. Among various energy storage products, electrochemical energy storage, that is, chemical battery technology is still a very important component, and will be the preferred energy storage technology for a long time to come. As an environmentally friendly green chemical battery, due to its excellent power density and energy density characteristics, lithium...

Claims

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Application Information

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IPC IPC(8): H01M2/16C08L81/02C08L67/02C08L77/06C08L25/10C08L23/14C08J5/18
CPCY02E60/12Y02E60/10
Inventor 顾方明郑泓
Owner HANGZHOU FUMO NEW MATERIAL TECH
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