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

A lithium battery and recharging technology, which is applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of reduced battery cycle life, deterioration of rechargeable lithium batteries, and increased thickness

Active Publication Date: 2020-03-10
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such separators containing additional binders added to the ceramic phase have the potential to degrade rechargeable lithium batteries due to increased internal resistance due to reduced porosity, increased thickness, and swelling of the binder in the electrolyte. question
[0009] In addition, ceramics as a coating material should be used as fine particles in order to reduce the coating thickness, but since the moisture content increases due to the specific surface area of ​​the fine particles, it may reduce the battery cycle life

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0106] 59 parts by weight of cross-linked polymethyl methacrylate (MXC-200W, NIPPON SHOKUBAI Co., Ltd., having an average particle diameter of 0.23 μm) as organic filler particles, as fluorine-based organic adhesive 22 parts by weight of PVdF (RC10278, Arkema (Arkema), with an average particle size of 0.23 microns) as mixture particles and 17 parts by weight of polymethyl methacrylate as (meth)acrylic organic binder particles ( BM2500M, ZEON) was mixed with 1 part by weight of a fluorine-based polyvinyl alcohol (PVA, Kuraray) binder to prepare a composition for coating.

[0107] The composition for coating was gravure-printed on both surfaces of a polyethylene porous substrate (thickness: 7.5 μm, penetration time: 110 seconds, BDV: 0.85 kilovolt (KV)) to produce a separator, so Each coating layer of the separator has a thickness of 0.5 μm on one surface of the porous substrate. Coating totals 1.0 microns on both surfaces.

[0108] When the content of the fluorine-based organ...

example 2

[0110] 67 parts by weight of cross-linked polymethyl methacrylate (MXC-200W, Nippon Shokubai Co., Ltd.) as organic filler particles, 12 parts by weight of PVdF (RC10278, Arkema) as fluorine-based organic binder particles, and as 19 parts by weight of polymethyl methacrylate (BM2500M, Zeon) of (meth)acrylic organic adhesive particles were mixed with 1 part by weight of fluorine-based polyvinyl alcohol (PVA, Kuraray) adhesive to prepare The composition of the coating.

[0111] The composition used for the coating was used to manufacture a separator according to the same method as in Example 1.

[0112] When the content of the fluorine-based organic binder particles with respect to the separator was measured by using a scanning electron microscope (SEM) image, the amount of the fluorine-based organic binder particles per one coat was 0.098 g / m2.

example 3

[0128] LiCoO 2 , polyvinylidene fluoride, and carbon black were added to the N-methylpyrrolidone solvent in a weight ratio of 96:2:2 to prepare a slurry. The slurry was coated on an aluminum thin film, and then dried and compressed to fabricate a positive electrode.

[0129] Graphite, polyvinylidene fluoride, and carbon black were added to N-methylpyrrolidone solvent at a weight ratio of 98:1:1 to prepare a slurry. The slurry was coated on a copper foil, and then dried and compressed to fabricate a negative electrode.

[0130] The separator according to Example 1 was placed between the fabricated positive and negative electrodes, resulting in a rolled jelly roll electrode assembly.

[0131] The jelly roll electrode assembly is fixed in a battery case, electrolyte is injected thereinto, and the battery case is sealed to manufacture a rechargeable lithium battery cell.

[0132] By mixing ethylene carbonate, ethylmethyl carbonate and diethyl carbonate in a volume ratio of 3:5:...

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Abstract

The invention discloses a separator for a rechargeable lithium battery and the rechargeable lithium battery including the same. Disclosed is the separator including a porous substrate and a coating layer disposed on at least one surface of the porous substrate, wherein the coating layer includes organic filler particles, fluorine-based organic binder particles, and (meth) acryl-based organic binder particles. The average particle diameter of the organic filler particles is equal to or greater than the average particle diameter of the fluorine-based organic binder particles, and the fluorine-based organic binder particles are present in each coating layer in an amount of less than or equal to about 0.1 g / m2. The separator for the rechargeable lithium battery has a thin thickness and improved adhesion to an electrode, and the rechargeable lithium battery including the separator exhibits improved cycle life characteristics and safety.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2018-0104744 filed with the Korean Intellectual Property Office on September 3, 2018, the entire contents of which are incorporated herein by reference. technical field [0003] The present disclosure relates to a separator for a rechargeable lithium battery and a rechargeable lithium battery including the same. Background technique [0004] In order to correspond to miniaturization and high performance of various devices, miniaturization and weight reduction of rechargeable batteries are becoming more and more important. In addition, the discharge capacity, energy density, and cycle characteristics of rechargeable batteries are becoming more and more important for applications in the field of electric vehicles and the like. In order to correspond to this use, rechargeable batteries having characteristics of large discharge capacity, hi...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M4/62H01M10/052H01M10/058H01M50/42H01M50/426H01M50/449H01M50/457
CPCH01M10/058H01M10/052H01M4/623H01M50/449H01M50/426H01M50/42H01M50/457H01M10/0525H01M10/0587H01M2220/20Y02E60/10H01M50/461Y02P70/50H01M50/411H01M50/443H01M50/491
Inventor 金佳仁金容庆金养燮李政润
Owner SAMSUNG SDI CO LTD