Multilayer, microporous polyolefin membrane, and production method thereof

a technology of microporous polyolefin and polyolefin membrane, which is applied in the direction of membranes, cell components, cell component details, etc., can solve the problems of impaired permeability and strength balance of microporous polyethylene membranes, etc., to suppress the deterioration caused during charging and discharging of batteries, excellent oxidation resistance and electrolyte injection performance, and excellent permeability strength balan

Active Publication Date: 2016-04-28
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a multilayer, microporous polyolefin membrane with improved properties such as gas barrier property, durability, and electrical conductivity. It has two layers made up of different types of polymers - propylene homopolymer and polypropylenes copolymer. These layers have specific weights and distributions of pore sizes, which help prevent degradations over time. By adding these layers together, the membranes become stronger and longer lasting compared to traditional methods like coating them on batteries. Additionally, they also improve their ability to resist corrosion and maintain good ionic conduction capabilities. Overall, this membrane provides better protection against oxygen diffusion and enhances the performance of lithium ion batteries.

Problems solved by technology

The technical problem addressed by this patent is how to improve the quality of microporous polyolefin membranes used as separators in batteries, particularly lithium ion batteries, while maintaining their good separation capabilities and thermal stability during repeated chargings.

Method used

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  • Multilayer, microporous polyolefin membrane, and production method thereof
  • Multilayer, microporous polyolefin membrane, and production method thereof
  • Multilayer, microporous polyolefin membrane, and production method thereof

Examples

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working example 1

(1) Preparation of First Polyolefin Solution

[0132]A first polyolefin composition containing, relative to the total weight of the first polyolefin composition, (a) 25% by weight of UHMwPE (Mw / Mn: 8.0) having an Mw of 2.0×106, (b) 72% by weight of HDPE (Mw / Mn: 8.6) having an Mw of 2.5×105, and (c) 3% by weight of polypropylene (Mw / Mn: 2.6; melting point: 155° C.) having an Mw of 9.7×104 was prepared by dry-blending. Per 100 parts by weight of the first polyolefin composition, 0.2 parts by weight of tetrakis[methylene-3-(3,5-ditertiary butyl-4-hydroxyphenyl)-propionate]methane as an antioxidant was dry-blended to prepare a first polyolefin resin.

[0133]To a strong kneading type twin-screw extruder, 20 parts by weight of the first polyolefin resin was supplied, and 80 parts by weight of liquid paraffin (50 cSt at 40° C.) was supplied to the twin-screw extruder via a side feeder. Melt-kneading was performed at 200 rpm at 210° C. to prepare a first polyolefin solution.

(2) Preparation of

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Abstract

Provided is a microporous polyolefin membrane which has excellent oxidation resistance and electrolyte injection performance and further has excellent permeability and strength balance. The multilayer, microporous polyolefin membrane has a first microporous layer containing polypropylene. The electrolyte injection performance is 20 seconds or less, at least one surface layer is the first microporous layer, and the PP distribution in the first microporous layer is uniform in the in-plane direction.

Description

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Claims

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Application Information

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Owner TORAY IND INC
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