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Separator for lithium-sulfur battery and lithium-sulfur battery including same

A technology for lithium-sulfur batteries and diaphragms, applied in the field of lithium-sulfur batteries and diaphragms for lithium-sulfur batteries, can solve the problems of prolongation, insufficient effect, and inability to ensure performance improvement effects, etc.

Pending Publication Date: 2020-09-01
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] These patents have improved the performance or life degradation of lithium-sulfur batteries to some extent by introducing a coating on the positive electrode and thereby preventing the outflow of sulfur, but the effect is not enough
In addition, the coating itself, which serves as a protective film, acts as a resistive layer, and the path of lithium ions in the electrolyte is extended or blocked, so that a sufficient performance improvement effect cannot be ensured.

Method used

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  • Separator for lithium-sulfur battery and lithium-sulfur battery including same
  • Separator for lithium-sulfur battery and lithium-sulfur battery including same
  • Separator for lithium-sulfur battery and lithium-sulfur battery including same

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preparation example Construction

[0094] The preparation method of the separator for lithium-sulfur batteries proposed in the present invention is not particularly limited in the present invention, and various methods known to those skilled in the art or modifications thereof are available.

[0095] For example, the preparation method of the separator for lithium-sulfur battery comprises the following steps:

[0096] (a) preparing a coating composition comprising a polymer comprising a main chain having a functional group comprising a non-covalent electron pair and a side chain substituted with an aromatic hydrocarbon group, and the coating composition comprising graphitic carbon compounds, and

[0097] (b) Applying the coating composition to at least one side of a separator substrate.

[0098] In the above coating composition, the polymer includes a polymer represented by the following Chemical Formula 1, and can be obtained by reacting a polymer composition having a functional group containing a non-covalen...

preparation example 1

[0154] 5.0g of branched polyethyleneimine (branched PEI (b-PEI600), M n : 600g / mol, product from Sigma Aldrich (Sigma Aldrich)) and 6.9g of 1,8-naphthalene dicarboxylic anhydride (product from Sigma Aldrich) dissolved in dimethylformamide, and It was stirred at 90°C for 48 hours to prepare polyethyleneimine substituted with 1,8-naphthalene dicarboxylic anhydride (PEI600-NA).

preparation example 2

[0156] 2.0 g of branched polyethyleneimine (branched PEI (b-PEI10k), M n : 10000g / mol, product from Sigma-Aldrich Company) and 2.76g of 1,8-naphthalene dicarboxylic anhydride (product from Sigma-Aldrich Company) were dissolved in dimethylformamide, and at 90°C Stir for 48 hours to prepare polyethyleneimine substituted with 1,8-naphthalene dicarboxylic anhydride (PEI10k-NA).

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Abstract

The present invention relates to a separator for a lithium-sulfur battery and a lithium-sulfur battery including same and, more specifically, to a separator for a lithium-sulfur battery, the separatorincluding: a porous substrate; and a coating layer formed on at least one surface of the porous substrate, wherein the coating layer includes: a polymer having, on the backbone thereof, functional groups including unshared electron pairs, and, on the side chains thereof, aromatic hydrocarbon groups; and a graphitic carbon-based compound.

Description

technical field [0001] This application claims the benefit of Korean Patent Application No. 10-2018-0058853 filed with the Korean Intellectual Property Office on May 24, 2018, the disclosure of which is incorporated herein by reference in its entirety. [0002] The invention relates to a diaphragm for lithium-sulfur batteries and a lithium-sulfur battery comprising the diaphragm. Background technique [0003] In recent years, with the rapid development of high performance, miniaturization, and weight reduction of electronic devices, communication devices, etc., and the increasing demand for electric vehicles related to the depletion of petroleum resources and environmental problems, there is a growing demand for power sources used for these products. There is an increasing demand for improvement of the performance and lifetime of secondary batteries. Among various secondary batteries, lithium secondary batteries have attracted attention as high-performance batteries due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/42C08L79/02C08K3/04C09D179/02C09D7/61H01M50/451
CPCC08K3/04C09D179/02Y02E60/10H01M50/443H01M50/414H01M50/403H01M10/052H01M4/382H01M4/38H01M50/411C08G73/0206C08G73/028C08K3/042H01M4/366C09D7/61H01M50/451H01M50/446H01M10/4235C08L79/08H01M50/431H01M50/449H01M50/491H01M50/463H01M50/46H01M10/0525
Inventor 金起炫梁胜普宋知恩申东析梁斗景金秀炫
Owner LG ENERGY SOLUTION LTD
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