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

A lithium-sulfur battery and diaphragm technology, which is applied in the field of lithium-sulfur battery diaphragm and lithium-sulfur battery, can solve the problems of prolongation, inability to ensure performance improvement effect, and insufficient effect, and achieve the effect of solving lithium polysulfide

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

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preparation example Construction

[0080] 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.

[0081] For example, the preparation method of the separator for lithium-sulfur battery comprises the following steps:

[0082] (a) preparing a coating composition comprising a polymer composition having in the main chain a functional group comprising a non-covalent electron pair and a compound comprising an aromatic hydrocarbon group, and

[0083] (b) Applying the coating composition to at least one side of a separator substrate.

[0084] The coating composition includes a polymer represented by the following Chemical Formula 1, and may be prepared by reacting a polymer having a functional group including a non-covalent electron pair as described above with a compound including an aromatic hydrocarbon group:

[0085] [ch...

preparation example 1

[0139] 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

[0141] 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 comprising same and, more specifically, to a separator for a lithium-sulfur battery, comprising:a porous substrate; and a coating layer formed on at least one surface of the porous substrate, wherein the coating layer includes a functional group containing a non-covalent electron pair in a mainchain and includes a polymer containing a side chain having an aromatic hydrocarbon group.

Description

technical field [0001] This application claims the benefit of Korean Patent Application No. 10-2018-0058848 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): H01M2/16H01M10/42H01M10/052C09D201/02H01M50/417H01M50/423H01M50/449H01M50/491
CPCH01M10/052C09D201/02Y02E60/10H01M50/414H01M50/42H01M4/38H01M4/382H01M4/366H01M50/449H01M50/403C09D201/005H01M50/417H01M50/491H01M50/423H01M10/4235C09D201/025H01M50/463H01M50/46C09D179/02H01M10/0525H01M50/411
Inventor 金起炫孙权男申东析梁斗景
Owner LG ENERGY SOLUTION LTD
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