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Separator for rechargeable lithium battery and rechargeable lithium battery including same

A lithium battery and recharging technology, applied in the direction of lithium batteries, non-aqueous electrolyte batteries, battery components, etc., can solve the problems of low mechanical properties, deterioration of long-term cycle life characteristics of batteries, and reduction of long-term cycle life characteristics of batteries

Active Publication Date: 2020-09-15
SAMSUNG SDI CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the case of styrene-butadiene rubber binders, the mechanical properties of the styrene-butadiene rubber binder tend to be relatively low, leading to a deterioration in the long-term cycle life characteristics of the battery
[0007] As a water-based adhesive, an acrylic adhesive can be applied in the form of a salt dissolved in water to increase the bonding strength with the inorganic particles, and thus the moisture content of the separator can increase due to the hygroscopicity of the salt, which tends to decrease Long-term cycle life characteristics of batteries

Method used

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  • Separator for rechargeable lithium battery and rechargeable lithium battery including same
  • Separator for rechargeable lithium battery and rechargeable lithium battery including same
  • Separator for rechargeable lithium battery and rechargeable lithium battery including same

Examples

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example 1

[0123] 3.81 parts by weight of polyether polyurethane (Sancure (Sancure) 2710, Lubrizol (Lubrizol)), 0.23 parts by weight of crosslinking agent (Picason ( ) XL-732, STAHL (STAHL)), 0.95 parts by weight of polyvinyl alcohol (PVA-500, Daejung Chemicals and Metals Co., Ltd. (Daejung Chemicals and Metals Co., Ltd.)), 95.24 parts by weight of aluminum water Stone (Nabaltec (Nabaltec) AOH60) and 150 parts by weight of deionized water were mixed and dispersed at 25°C for 30 minutes with a mechanical stirring device to prepare a coating composition with a solid content of 40% by weight.

[0124] The composition was bar-coated to a thickness of 3 μm on a 12 μm thick polyethylene porous substrate (air permeability: 120 sec / 100 cc, puncture strength: 450 kgf, SK Co., Ltd.), and then Drying was performed at 70°C for 10 minutes to produce a separator for a rechargeable lithium battery cell.

example 2

[0126] With 1.9 parts by weight of polyether polyurethane (Sancure 2710, Lubrizol), 0.95 parts by weight of polyvinyl alcohol (PVA-500, Daiei Chemical and Metal Co., Ltd.), 1.9 parts by weight of (methyl ) acrylic resin (Carbosperse-k-702 (Carbosperse-k-702), Lubrizol), 95.24 parts by weight of diaspore (Nabaltec AOH60) and 150 parts by weight of deionized water mix, and use mechanical stirring equipment at 25 °C for 30 minutes to prepare a coating composition having a solid content of 40% by weight, and then use the coating composition to manufacture a separator for a rechargeable battery according to the same method as Example 1.

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Abstract

The present disclosure relates to a separator for a rechargeable lithium battery including a porous substrate and a coating layer disposed on at least one surface of the porous substrate, wherein thecoating layer includes a binder including polyurethane and polyvinyl alcohol and inorganic particles and the polyurethane and the polyvinyl alcohol are included in a weight ratio of about 5 : 5 to about 9 : 1, and a rechargeable lithium battery including the same.

Description

[0001] [Cross-reference to related applications] [0002] This application claims priority and rights to Korean Patent Application No. 10-2019-0025306 filed with the Korean Intellectual Property Office on March 5, 2019, the entire contents of which are incorporated herein by reference. technical field [0003] A separator for a rechargeable lithium battery and a rechargeable lithium battery including the same are disclosed. Background technique [0004] A separator for an electrochemical cell is an intermediate film that separates a positive electrode from a negative electrode in the battery and continuously maintains ion conductivity to enable charging and discharging of the battery. When the battery is exposed to a high temperature environment due to abnormal behavior, the separator may shrink mechanically or be damaged due to melting characteristics at low temperature. At this time, the positive and negative electrodes will come into contact with each other and may cause...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/052C09D175/08C09D129/04C09D133/04C09D7/61H01M50/414H01M50/417H01M50/42H01M50/451
CPCH01M10/052C09D175/08C09D7/61C08L2203/206C08L2205/03C08K2003/2227H01M50/451H01M50/42H01M50/414H01M50/417C08L29/04C08K3/22C08L33/04Y02E60/10H01M50/446H01M50/449H01M50/491H01M50/431H01M50/443H01M50/411
Inventor 张锭洙赵珉镐金荷娜朴明国梁承林李炳珉郑普卿金来成
Owner SAMSUNG SDI CO LTD