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Separator for secondary battery, and lithium secondary battery comprising same

A technology for lithium secondary batteries and separators, applied in the field of lithium secondary batteries, can solve the problems of secondary battery stability and performance deterioration, low adhesion between coatings and electrolytes, and battery temperature increase safety, etc. Effects of improved mechanical strength, improved adhesion, and improved safety

Active Publication Date: 2020-07-14
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013]However, when a liquid electrolyte is used as described above, there is a high possibility of electrode material degradation and organic solvent volatilization
In addition, there are safety concerns such as burning due to the temperature increase of the battery itself and its surroundings
In particular, lithium secondary batteries have a problem in that the thickness of the battery increases due to gas generation inside the battery due to decomposition of the carbonate organic solvent and / or side reactions between the organic solvent and the electrodes during charge / discharge.
[0016]However, when using separators with coatings including gel polymer electrolytes and inorganic particles, the adhesion between coatings and electrolytes is low , deteriorating the stability and performance of the secondary battery

Method used

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  • Separator for secondary battery, and lithium secondary battery comprising same
  • Separator for secondary battery, and lithium secondary battery comprising same
  • Separator for secondary battery, and lithium secondary battery comprising same

Examples

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Embodiment 1

[0219] (1) Preparation of organic binder

[0220] In a nitrogen atmosphere, vinylidene fluoride (VDF) as a monomer, diisopropyl peroxydicarbonate as a free radical initiator, and 1,1,2-trichlorotricarbonate as a solvent Fluoroethane (1,1,2-trichlorotrifluoroethane) was introduced into the reactor cooled to -15°C. Thereafter, while maintaining 45° C. to initiate polymerization, a polymerization reaction was performed by stirring the reactant at 200 rpm to polymerize to obtain a compound in which the unit represented by the formula X-1 was repeated. After 10 hours, NaCl was introduced by substituting Cl at the end of the polymerized compound to terminate the polymerization reaction, and monomers not participating in the polymerization reaction were discharged.

[0221] The polymerized compound was dispersed in N-methylpyrrole as a solvent, and then acryl acid was introduced at a molar ratio of 1:1.1 based on the polymerized compound, and while maintaining 45° C., in the presenc...

Embodiment 2

[0226] In a nitrogen atmosphere, vinylidene fluoride (VDF) and hexafluoropropylene (HFP, hexafluoropropylene) mixed in a weight ratio of 7:3 as monomers, diisopropyl peroxydicarbonate as a free radical initiator (diisopropylperoxydicarbonate), and 1,1,2-trichlorotrifluoroethane (1,1,2-trichlorotrifluoroethane) as a solvent were introduced into a reactor cooled to -15°C. Thereafter, while maintaining 45° C. to initiate polymerization, a polymerization reaction was performed by stirring the reactant at 200 rpm, thereby repeating the unit represented by formula X-2. After 10 hours, NaCl was introduced by substituting Cl at the end of the polymerized compound to terminate the polymerization reaction, and monomers not participating in the polymerization reaction were discharged.

[0227] The polymerized compound was dispersed in N-methylpyrrole as a solvent, and then acryl acid was introduced at a molar ratio of 1:1.1 based on the polymerized compound, and while maintaining 45° C.,...

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Abstract

The present invention relates to a separator for a secondary battery, and a lithium secondary battery comprising same, the separator comprising a base and a coating layer formed on the surface of thebase, the coating layer comprising an organic binder and inorganic particles, the organic binder comprising an ethylenically unsaturated group.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2018-0006795 filed in the Korean Intellectual Property Office on January 18, 2018, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a separator for a secondary battery and a lithium secondary battery including the same, and more particularly, to a separator for a secondary battery capable of improving the performance and safety of a lithium secondary battery plate and a lithium secondary battery including the separator. Background technique [0004] With the technological development and increase in demand for mobile devices, the demand for secondary batteries as energy sources has rapidly increased. Among these secondary batteries, lithium secondary batteries having high energy density and operating potential, long cycle life, and low self-di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0565H01M10/052H01M50/417H01M50/426H01M50/449H01M50/451H01M50/454
CPCH01M10/052H01M10/0565Y02E60/10H01M2300/0085H01M50/461H01M50/446H01M50/449H01M50/426H01M50/451H01M50/417H01M50/454H01M50/414H01M50/443H01M50/42C08F120/12C09D101/02C09D127/16C09D171/02C09D179/08H01M10/0525H01M2300/0082
Inventor 申元景安庆昊李哲行李在原
Owner LG ENERGY SOLUTION LTD
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