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Electrolyte solution for lithium-sulfur battery and lithium-sulfur battery comprising same

A lithium-sulfur battery and electrolyte technology, applied in battery electrodes, lithium batteries, batteries, etc., can solve problems such as conductivity degradation, insufficient effect, battery side reactions, etc.

Active Publication Date: 2019-09-03
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] These patents suppress the dissolution of lithium polysulfide to a certain extent through additives or coatings, but the effect is not enough
In addition, there are disadvantages that when additives are used, there is a problem of deterioration of conductivity or promotion of side reactions of batteries, and when a coating is formed, sulfur is lost during surface treatment and it takes much time and cost

Method used

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  • Electrolyte solution for lithium-sulfur battery and lithium-sulfur battery comprising same
  • Electrolyte solution for lithium-sulfur battery and lithium-sulfur battery comprising same
  • Electrolyte solution for lithium-sulfur battery and lithium-sulfur battery comprising same

Examples

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specific Embodiment approach

[0122] Hereinafter, preferred embodiments of the present invention will be described to facilitate understanding of the present invention. However, the following embodiments are only illustrations of the present invention, and it is obvious to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention. Such changes and modifications are within the scope of the appended claims.

[0123] Examples and Comparative Examples: Preparation of Electrolyte

[0124] Electrolytes for lithium-sulfur batteries were prepared according to the compositions shown in Table 1 below.

[0125] 【Table 1】

[0126]

experiment example 1

[0127] Experimental example 1: Evaluation of life characteristics

[0128] Sulfur was mixed with a conductive material and a binder in acetonitrile using a ball mill to prepare a positive electrode active material slurry. In this case, carbon black was used as the conductive material, and polyethylene oxide (molecular weight: 5,000,000 g / mol) was used as the binder. The mixing weight ratio was set as sulfur:conductive material:binder at 90:5:5. A slurry of a positive electrode active material was coated on an aluminum current collector and dried to manufacture a positive electrode.

[0129] A lithium metal thin film having a thickness of 40 μm was used as the negative electrode.

[0130] The prepared positive and negative electrodes were placed to face each other with a polyethylene separator interposed therebetween, and then, the electrolytic solutions prepared in the above-described Examples and Comparative Examples were injected to prepare a coin-type battery.

[0131] T...

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Abstract

The present invention relates to an electrolyte solution for a lithium-sulfur battery and a lithium-sulfur battery comprising same and, more specifically, to an electrolyte solution, for a lithium-sulfur battery, comprising lithium salts, an organic solvent and an additive, wherein the additive comprises alkali metal salt type ionomer. The electrolyte solution for a lithium-sulfur battery comprises polymer which comprises an alkali metal ion as an additive and thus enables the transfer property of a lithium ion to be improved and the capacity and lifetime characteristics of the lithium-sulfurbattery to be enhanced.

Description

technical field [0001] This application claims the benefit of Korean Patent Application No. 10-2017-0065508 filed on May 26, 2017 and Korean Patent Application No. 10-2017-0166320 filed on December 6, 2017 at the Korean Intellectual Property Office, and will Its disclosure is incorporated herein by reference in its entirety. [0002] The invention relates to an electrolyte solution for a lithium-sulfur battery and a lithium-sulfur battery containing the electrolyte solution. Background technique [0003] Recently, electronic devices and communication devices are rapidly becoming smaller, lighter, higher-performance and involve environmental issues and demand for electric vehicles has greatly increased. Accordingly, there is an increasing demand for performance improvement of secondary batteries used as energy sources for these products. In order to realize a secondary battery satisfying this demand, many studies have been conducted on a lithium-sulfur battery using a sulfu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/052H01M4/38
CPCH01M4/38H01M4/381H01M10/052H01M10/0565H01M10/0567H01M10/0568H01M2300/0085Y02E60/10H01M2220/20H01M2220/10H01M2300/0037
Inventor 杨承润梁斗景
Owner LG ENERGY SOLUTION LTD