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Composite electrolyte, protective film, protected negative electrode, lithium metal battery and method for manufacturing protected negative electrode

A technology of composite electrolyte and protective film, which is applied in the field of composite electrolyte and can solve the problems of poor charging and discharging characteristics of lithium secondary batteries

Pending Publication Date: 2019-07-12
SAMSUNG ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the charge and discharge characteristics of the lithium secondary battery are poor

Method used

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  • Composite electrolyte, protective film, protected negative electrode, lithium metal battery and method for manufacturing protected negative electrode
  • Composite electrolyte, protective film, protected negative electrode, lithium metal battery and method for manufacturing protected negative electrode
  • Composite electrolyte, protective film, protected negative electrode, lithium metal battery and method for manufacturing protected negative electrode

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Experimental program
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Effect test

example Embodiment approach

[0041] According to an example embodiment, a composite electrolyte includes: positively charged particles, positively charged particles by having a coordination bond with a cation, or a combination thereof; and a lithium salt. Since the composite electrolyte includes positively charged particles and / or particles positively charged by having coordination bonds with cations (i.e., anion-accepting particles or anion-absorbing particles), the anions in the composite electrolyte can be localized to the surface and / or near the particle. While not wishing to be bound by theory, it is understood that localizing the anions to the surface of the particles inhibits the migration of anions in the composite electrolyte. It is understood that suppressed anion migration leads to increased lithium ion migration in the composite electrolyte, thereby leading to an increase in the lithium ion migration number in the composite electrolyte.

[0042] refer to figure 1 , in order to maintain charg...

Embodiment 1

[0246] Embodiment 1: PEO+MS-DEAE+ lithium salt

[0247] Polyethylene oxide (PEO) was mixed with acetonitrile to obtain a solution of 5 weight percent (wt%) PEO in acetonitrile. A mixture containing particles and lithium bis(fluorosulfonyl)imide (LiFSI, LiN(SO 2 F) 2 ) to prepare a composite electrolyte-forming composition.

[0248] Anhydrous THF was added to MS-DEAE microspheres (having about 3 μm average diameter), thus obtaining the mixture comprising particles. Here, the amount of the particles is about 5% by weight.

[0249] A composite electrolyte-forming composition was prepared in which the particles were in an amount of 15 parts by weight based on 100 parts by weight of PEO, and the amount of LiFSI was 30 parts by weight based on 100 parts by weight of PEO.

[0250] Formula 8

[0251]

[0252] The prepared composite electrolyte-forming composition was cast on the part, and the acetonitrile and THF in the resultant were gradually evaporated in an argon glove bo...

Embodiment 2

[0261] Example 2: MS-DEAE+lithium salt protective film / protected negative electrode

[0262] Anhydrous THF was added to MS-DEAE microspheres (with a diameter of about 3 μm) in which poly(styrene-divinylbenzene) copolymer particles were covalently attached to oxyethylenediethylammonium groups represented by average diameter) to obtain a mixture containing particles. Here, the amount of the particles is about 5% by weight.

[0263] Formula 8

[0264]

[0265] To the prepared particle-containing mixture was added lithium bis(fluorosulfonyl)imide (LiFSI, LiN(SO 2 F) 2 ) to prepare a protective film-forming composition. The amount of LiFSI is about 30 parts by weight based on 100 parts by weight of the particles.

[0266] The prepared protective film-forming composition was applied to a thickness of about 3 μm on a lithium metal thin film (having a thickness of about 40 μm) using a doctor blade.

[0267] The coated resultant was dried at a temperature of about 25° C., and ...

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Abstract

The invention relates to a composite electrolyte, protective film, a protected negative electrode, a lithium metal battery and a method for manufacturing the protected negative electrode. The composite electrolyte includes: a positively charged particle, a particle that is positively charged by having a coordinate bond with a cation, or a combination thereof; and a lithium salt.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to and benefit from, and all rights arising from, Korean Patent Application No. 10-2017-0170448 filed with the Korean Intellectual Property Office on December 12, 2017, the contents of which are hereby incorporated by reference in their entirety. technical field [0003] The present disclosure relates to a composite electrolyte, a protective film including the composite electrolyte, a protected negative electrode including the protective film, and a lithium metal battery including the protected negative electrode. Background technique [0004] Lithium secondary batteries may have excellent charge / discharge efficiency and capacity, no memory effect, and lowest self-discharge when not in use. Therefore, lithium secondary batteries have been used as core electrical components of portable electronic devices since their commercialization. In recent years, the use of lithium secondary batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M10/052
CPCH01M4/134H01M4/1395H01M10/052H01M10/0565H01M2300/0091H01M4/366H01M4/382H01M10/056Y02E60/10H01B1/122C08L71/02H01M4/664H01M4/667H01M10/0525H01M2004/027H01M2004/028H01M2300/0028H01M2300/0071H01M2300/0082H01M2300/0094H01M4/58C08L25/08C08L27/16C08L27/20C08L53/02H01M4/485
Inventor 李龙键S.柳敏规杉本林东民
Owner SAMSUNG ELECTRONICS CO LTD
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