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Separation membrane for electrochemical device, and method for manufacturing same

An electrochemical and separator technology, applied in the direction of hybrid capacitor separators, separators/films/diaphragms/spacers, circuits, etc., can solve the difficulty of ensuring durability and reliability, and the adhesion of acrylic copolymer compositions Agents cannot propose alternative solutions, low thermal stability and physical stability of the battery, etc., to achieve the effects of improving peel strength, enhancing heat resistance, and high degree of crosslinking

Pending Publication Date: 2022-01-14
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adhesives with acrylic copolymer compositions disclosed in the aforementioned patent documents do not present a practical alternative
In particular, when the above-mentioned composition is used, in the case of coating based on a sectional thickness of the coating of 4 μm or less, the battery exhibits low thermal stability and physical stability, resulting in difficulties in securing durability and reliability. question

Method used

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  • Separation membrane for electrochemical device, and method for manufacturing same
  • Separation membrane for electrochemical device, and method for manufacturing same

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Embodiment 1 to Embodiment 3

[0088] First, a binder resin, a crosslinking agent, and an acid were added to acetone and dissolved at 50°C for about 12 hours to prepare a polymer solution. The concentration of the binder resin in the polymer solution was 10% by weight. The contents (by weight ratio) of the binder resin and acid (acid) are shown in Table 1 below. In addition, a crosslinking agent was mixed at a ratio of 5 parts by weight based on 100 parts by weight of the crosslinkable acrylic binder resin. Next, alumina (diameter 500nm) was prepared as inorganic particles, and the inorganic particles were added and dispersed in the polymer solution at a weight ratio of binder resin / inorganic particles of 10 / 90, thereby providing The composition of the coating. The prepared composition was applied onto a porous substrate made of polyethylene with a thickness of 12 μm and a porosity of 30% by a dip process, followed by drying. Drying is carried out in an environment controlled at a relative humidity of 40...

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Abstract

A separation membrane according to the present invention includes a porous coating layer formed by crosslinking a crosslinkable polymer with the participation of an acid. As a result, the heat resistance, safety, and physical strength of the separation membrane are increased, the peel strength between a porous substrate and the porous coating layer is improved, and desorption of inorganic particles in the porous coating layer is prevented. In addition, since the degree of crosslinking is improved, the amount added of a crosslinkable binder resin can be reduced, and thus the amount added of a non-crosslinkable binder resin, inorganic particles, or both can be increased. That is, the effect of improving both heat resistance and adhesion can be achieved even when a small amount of crosslinkable binder resin is used.

Description

technical field [0001] This application claims priority from Korean Patent Application No. 10-2019-0032424 filed in Korea on March 21, 2019. The present disclosure relates to a separator for an electrochemical device such as a lithium secondary battery and a method of manufacturing the same. More specifically, the separator includes a porous coating comprising a cross-linked polymer disposed on the surface of a porous substrate. Background technique [0002] Recently, energy storage technology has received increasing attention. Efforts to develop electrochemical devices have increasingly been realized as the application of energy storage technology has expanded to energy for mobile phones, video cameras and notebook PCs, and even for electric vehicles. In this context, electrochemical devices have attracted the most attention. Among these electrochemical devices, the development of rechargeable secondary batteries has been attracting attention. Recently, in developing su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/449H01M50/446H01M50/451H01G11/52H01M50/409H01M50/489H01M50/491
CPCH01G11/52Y02E60/10H01M50/449H01M50/42H01M50/426H01M50/446H01M10/052H01M50/417H01M50/403H01M50/457H01M50/409H01M50/491H01M50/489H01G9/02H01M50/411Y02P70/50H01M50/414
Inventor 权慧珍金明洙尹秀珍
Owner LG ENERGY SOLUTION LTD
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