Electrochemical element separation membrane including low-resistance coating layer, and method for manufacturing same

An electrochemical and diaphragm technology, applied in the field of diaphragms for electrochemical devices, can solve problems such as cycle life deterioration

Active Publication Date: 2020-12-18
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of a flexible packaging case made of aluminum laminate, the case is flexible, whereby a gap may be formed between the electrode and the separator during charging / discharging, causing a technical problem of cycle life deterioration

Method used

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  • Electrochemical element separation membrane including low-resistance coating layer, and method for manufacturing same
  • Electrochemical element separation membrane including low-resistance coating layer, and method for manufacturing same
  • Electrochemical element separation membrane including low-resistance coating layer, and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] [Example 1: Manufacture of separator]

[0107] Example 1

[0108] First, 35 g of PVdF-HFP (Solvay Solef 21510, T m 132°C, weight average molecular weight 300,000, HFP substitution degree 15 mol%) was dissolved in 400g of NMP, and 65g of Al was introduced into it 2 o 3 (Japanese Light Metal Co., LS235, D50 500 nm) and dispersed by ball milling to prepare a slurry.

[0109] Next, the slurry was sequentially applied to a porous substrate made of polyethylene (ND9 from Shanghai Energy Co., thickness 9 μm, air transmission time 180 seconds) by microgravure coating method / 100cc, resistance 0.79Ω, porosity 37%) on both surfaces, and then, sequentially dipped in a primary coagulation bath and a secondary coagulation bath to solidify the slurry. The coagulation solution contained in the primary coagulation bath contained NMP as a solvent and water as a non-solvent mixed in a weight ratio of 5:95, and the coagulation solution was controlled at a temperature of 15° C., and t...

Embodiment 2

[0111] A separator was obtained in the same manner as in Example 1 except that the respective amounts of the binder resin and the inorganic particles were 50 g.

[0112] The produced separator had a thickness of 17 μm, an air transmission time of 222 seconds / 100 cc, and an electric resistance of 1.10Ω. A high peel force of 111 gf / 25mm was measured.

Embodiment 3

[0114] In addition to the binder resin for Kynar 2500(T m 127° C., weight average molecular weight 230,000, HFP substitution degree 18 mol %), a separator was obtained in the same manner as in Example 1. The produced separator had a thickness of 17 μm, an air transmission time of 217 seconds / 100 cc, and an electric resistance of 1.08Ω. A high peel force of 108 gf / 25mm was measured.

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Abstract

A separation membrane according to the present invention ensures heat resistance and simultaneously has low resistance, appropriate air porosity and electrolyte retention. The separation membrane according to the present invention includes a porous substrate and a low-resistance coating layer formed on at least one surface of the porous substrate, wherein the low-resistance coating layer includes:a node (nodes) including inorganic particles and a polymer resin for coating at least a part of the surfaces of the inorganic particles; and filament(s) having a thread-like shape and coming out fromthe polymer resin of the nodes, wherein one or more filaments extends from one node, and the filaments are arranged to connect one node with another node.

Description

technical field [0001] This application claims the priority of Korean Patent Application No. 10-2018-0081891 filed on July 13, 2018 and Korean Patent Application No. 10-2018-0132497 filed on October 31, 2018 in Korea. The present disclosure relates to a separator for an electrochemical device, wherein the electrochemical device may be a primary battery or a secondary battery, and the secondary battery includes a lithium ion secondary battery. Background technique [0002] Non-aqueous secondary batteries represented by lithium ion secondary batteries have been widely used as power sources for portable electronic devices such as notebook computers, mobile phones, digital cameras, camcorders, and the like. In addition, recently, application of such batteries to vehicles has been studied due to their high energy density characteristics. [0003] With the miniaturization and weight reduction of portable electronic devices, the housing of non-aqueous secondary batteries has been ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/443H01M50/451H01M50/457H01M50/489H01M50/491
CPCY02E60/10H01M50/451H01M50/457H01M10/0525H01M50/417H01M50/426H01M50/443H01M50/446H01M50/491H01M50/403H01M50/489
Inventor 李柱成李娥英
Owner LG CHEM LTD
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