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Positive electrode active material for lithium-sulfur battery, method for preparing same, and lithium-sulfur battery comprising same

A positive electrode active material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, active material electrodes, etc., can solve the problems of limited sulfur loading, complicated methods, and insufficient effects, and achieve high energy density, high capacity, The effect of maximizing capacity performance

Pending Publication Date: 2022-07-08
LG ENERGY SOLUTION LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] These published patents prevent the dissolution of lithium polysulfide and improve the conductivity of sulfur by introducing materials with excellent lithium polysulfide adsorption capacity or conductivity to the positive electrode in the form of additives or coatings, and thus improve the lithium polysulfide to a certain extent. There is a problem of deterioration in the performance or life of lithium-sulfur batteries, but the effect is not sufficient
In addition, the methods proposed in these patents are not only somewhat complicated, but also have the problem that the amount of sulfur that can be added (i.e., the loading amount) is limited

Method used

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  • Positive electrode active material for lithium-sulfur battery, method for preparing same, and lithium-sulfur battery comprising same
  • Positive electrode active material for lithium-sulfur battery, method for preparing same, and lithium-sulfur battery comprising same
  • Positive electrode active material for lithium-sulfur battery, method for preparing same, and lithium-sulfur battery comprising same

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Embodiment

[0164] Hereinafter, in order to facilitate understanding of the present invention, preferred examples of the present invention will be described. However, it will be apparent to those skilled in the art that the following examples are only for illustrating the present invention and that various changes and modifications can be made within the scope and spirit of the present invention and that such changes and modifications are set forth in the appended claims within the scope of the book.

preparation example 1

[0166] Preparation Example 1 Preparation of Polythiophene Acetic Acid

[0167] 10 g of 3-thiopheneacetic acid, 50 ml of distilled methanol and 0.1 ml of sulfuric acid were added to a two-necked round-bottomed flask, and stirred at 80 °C for 24 hours, then the methanol was removed in vacuo, and the resultant was dissolved in diethyl ether and extracted with distilled water 3 Second-rate. Magnesium sulfate was added to the diethyl ether layer to remove moisture and filtered to prepare liquid methyl thiophene acetate.

[0168] After dissolving 2 ml of methyl thiopheneacetate in 5 ml of chloroform, 8.7 g of ferric chloride (FeCl 3 ), and the resultant was dissolved in 48 ml of chloroform, and stirred at 0° C. for 24 hours to obtain poly(thiophene methyl acetate).

[0169] Methyl thiopheneacetate was added to a 2M aqueous sodium hydroxide solution and stirred at 100°C for 24 hours to obtain poly(sodium thiopheneacetate).

[0170] 1 M hydrochloric acid was added to sodium polyt...

preparation example 2

[0171] Preparation Example 2 Preparation of Polythiophene Acetic Acid-Polyethylene Glycol Graft Copolymer

[0172] After dissolving 0.5 g of polythiopheneacetic acid of Preparation Example 1 in 45 ml of dimethylformamide as a solvent, 2.8 g of polyethylene glycol (M n =400) to prepare a mixed solution. At this time, the obtained reactant was precipitated in water to obtain pure polythiopheneacetic acid-polyethylene glycol graft copolymer (M w =20000), and according to Formula 1 of the present invention, n is 0.7.

[0173] Examples and Comparative Examples

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Abstract

The present invention relates to a positive electrode active material for a lithium-sulfur battery, a method for preparing the same, and a lithium-sulfur battery comprising the same, and more particularly, to a positive electrode active material for a lithium-sulfur battery comprising a particulate structure of a core-shell structure comprising a core part and a shell part covering the entire surface or part of the surface of the core part, wherein the core part comprises a sulfur compound, and the shell part comprises a polythiopheneacetic acid-polyethylene glycol graft copolymer. The positive electrode active material for a lithium-sulfur battery according to the present invention has excellent electrochemical reactivity and adsorbs lithium polysulfide, thereby improving the capacity and lifespan characteristics of the lithium-sulfur battery.

Description

technical field [0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2020-0100684 filed on Aug. 11, 2020, the entire contents of which are incorporated herein by reference in their entirety. [0002] The present invention relates to a positive electrode active material for a lithium-sulfur battery, a preparation method thereof, and a lithium-sulfur battery comprising the same. Background technique [0003] As the range of use of lithium secondary batteries expands not only to portable electronic devices and communication devices, but also to electric vehicles (EVs) and power storage systems (ESSs), demand for high-capacity lithium secondary batteries used as their power sources is increasing. Demand has been growing. [0004] Among various lithium secondary batteries, a lithium-sulfur battery is a battery system that uses a sulfur-based material having a sulfur-sulfur bond (S-S bond) as a positive electrode active material, and us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M10/052H01M4/38Y02E60/10H01M4/366H01M4/622H01M4/5815H01M4/625H01M4/139H01M2004/021H01M2004/028H01M4/62H01M4/624H01M4/0471H01M10/0525
Inventor 金秀炫李钟赞金起炫孙权男郑道恩宫灿荣
Owner LG ENERGY SOLUTION LTD
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