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Composite separation membrane and preparation method thereof

A separation membrane and polymer-based technology, applied in structural parts, electrical components, battery components, etc., can solve the problems of insufficient wettability of non-aqueous electrolytes, achieve excellent mechanical and physical properties, excellent wettability, ion excellent mobility

Active Publication Date: 2022-03-29
SK INNOVATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wettability for non-aqueous electrolytes is still insufficient, therefore, there is still a need to increase the battery capacity

Method used

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  • Composite separation membrane and preparation method thereof
  • Composite separation membrane and preparation method thereof
  • Composite separation membrane and preparation method thereof

Examples

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preparation example Construction

[0039] In addition, the present invention provides a novel composite separation membrane that is remarkably excellent in charge and discharge efficiency and excellent in heat resistance and mechanical strength, and a preparation method thereof, the composite separation membrane comprising a porous substrate; A metal precursor is laminated on a porous substrate, and then a reactant is used to form one or two or more metal compound layers, and then a ceramic layer is formed on top of it.

[0040] In addition, the present invention provides a composite separation membrane capable of increasing battery capacity and a preparation method thereof. The increase in battery capacity is achieved through the following methods. Corona discharge treatment or plasma discharge treatment is performed on the surface of the porous polymer substrate, the metal compound layer, or the porous polymer substrate and the metal compound layer, and a ceramic layer is formed on the upper part to improve th...

Embodiment 1

[0103] In order to prepare polyolefin-based microporous membranes, a weight-average molecular weight of 3.8×10 5 High-density polyethylene, dibutyl phthalate mixed in a ratio of 1:2 and paraffin wax with a kinematic viscosity of 160cSt at 40°C are used as diluents, and the contents of polyethylene and diluents are 30% by weight and 70% by weight, respectively. %. The composition was extruded at a temperature of 240° C. using a twin-screw laminator equipped with a T-die, and phase separation was induced through a zone set at 180° C., and formed into a sheet using casting rolls. It is produced by successive biaxial stretching with the stretching ratio MD and TD being 7.5 times and the stretching temperature being 131°C. The heat setting temperature is 130°C and the heat setting width is 1, 1.3 and 1.1. And made. The resulting separation membrane had a final thickness of 25 μm, a gas permeability of 100 sec, and longitudinal and transverse shrinkages at 130° C. of 25% and 28%, ...

Embodiment 2

[0107] In Example 1, in addition to using a coaxial (in-line) oxygen plasma device, under the following conditions, that is, 1.9kw, the distance between the substrate and the plasma slit (slit) is 3mm, and the plasma slit gap (s lit gap) The porous polymer substrate was treated in the same manner as in Example 1, except that the porous polymer substrate was treated at a line speed of 2 mm and a line speed of 3 m / min. The results are shown in Table 1.

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Abstract

The present invention relates to a composite separation membrane, which comprises: a porous polymer substrate; an atomic layer deposition metal oxide layer formed on the surface of the porous polymer substrate; and a ceramic layer, It is formed on the metal oxide layer.

Description

technical field [0001] The invention relates to a separation membrane for a lithium secondary battery and a preparation method thereof. In addition, the present invention provides a novel separation membrane for a lithium secondary battery that exhibits high heat resistance and excellent wettability with an electrolytic solution. In addition, the present invention provides a novel separation membrane for lithium secondary batteries in which the above-mentioned wettability is remarkably improved and a high-capacity battery can be provided. Background technique [0002] Polyolefin microporous film (microporous film) is widely used as various battery separators, separation filters and microfiltration separation membranes (membranes) for its chemical stability and excellent physical properties. [0003] Recently, in order to meet the trend of high capacity and high output of secondary batteries, there are efforts to improve the characteristics of separation membranes used for h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/449H01M50/403
CPCH01M50/431H01M50/403H01M50/411Y02E60/10
Inventor 李济晏郭元燮李根金珍赫田民湖郑尚倍金镇雄成贞文
Owner SK INNOVATION CO LTD
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