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

A lithium-sulfur battery and electrolyte technology, applied in the direction of non-aqueous electrolyte batteries, electrolytes, lithium batteries, etc., can solve the problems of battery performance degradation, swelling, battery limitation, etc., and achieve the effects of inhibiting dissolution, long life, and improving efficiency

Pending Publication Date: 2022-03-18
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] These existing technologies form a physical protective layer by pre-treating the surface of lithium metal with materials such as organic / inorganic composites with excellent mechanical properties, or by controlling the chemical reactivity of the electrolyte to inhibit the interaction between the electrolyte and lithium metal to a certain extent. reaction or the formation of lithium dendrites, but the effect is not sufficient
In addition, in the case of a physical protective layer, a separate pretreatment process is required, and there is a problem of denaturation of the protective layer such as hardening or swelling of the protective layer as the charging / discharging of the battery proceeds
In addition, in the case of using an electrolyte containing a specific component, not only the applicable battery is limited, but it may also cause a problem of deterioration of battery performance

Method used

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

Examples

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Effect test

Embodiment 1

[0147] By dissolving 0.75M LiFSI and 3.0% by weight lithium nitrate in an organic solvent composed of 2-methylfuran and dimethoxyethane (2-methylfuran:DME=1:2 (volume ratio)) A solution is prepared. Subsequently, an electrolyte was prepared by adding bis(4-nitrophenyl)carbonate to the solution so that its content was 1.4% by weight based on a total of 100% by weight of the electrolyte.

Embodiment 2

[0149] By using 87.5% by weight of sulfur-carbon composite (S:C=75:25 (weight ratio)) as positive electrode active material, 5.0% by weight of Danca black as conductive material and 7.5% by weight of styrene-butadiene as binder Rubber / carboxymethylcellulose (SBR:CMC=70:30 (weight ratio)) were mixed to prepare a positive electrode slurry composition.

[0150] The positive electrode slurry composition was coated on an aluminum current collector with a thickness of 20 μm, dried at 100° C. for 12 hours, and pressed with a roller press to prepare a positive electrode. At this time, the loading capacity of the positive electrode active material is 5.6mAh / cm 2 below, and the porosity of the positive electrode is 70%.

[0151] A lithium-sulfur battery was prepared by placing the prepared positive and negative electrodes facing each other, interposing a polyethylene separator with a thickness of 16 μm and a porosity of 45%, and injecting 70 μL of the electrolyte prepared in Example 1....

Embodiment 3

[0154] Except that the volume ratio of 2-methylfuran and dimethoxyethane is changed to 1:4 and the content of bis(4-nitrophenyl)carbonate is changed to 2.0% by weight, in the same manner as in Example 1 Electrolytes were prepared in the same manner.

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Abstract

The present invention relates to an electrolyte for a lithium-sulfur battery and a lithium-sulfur battery comprising the same, the electrolyte for a lithium-sulfur battery comprising a lithium salt, a non-aqueous organic solvent and an additive, in which the non-aqueous organic solvent comprises an ether compound and a heterocyclic compound comprising one or more double bonds and comprising an oxygen atom or a sulfur atom, and the additive contains a carbonate compound.

Description

technical field [0001] This application claims Korean Patent Application No. 10-2020-0045529 filed with the Korean Intellectual Property Office on April 14, 2020 and Korean Patent Application No. 10-2021- filed with the Korean Intellectual Property Office on April 8, 2021 0045778, the disclosure of which is incorporated herein by reference in its entirety. [0002] The invention relates to an electrolyte for a lithium-sulfur battery and a lithium-sulfur battery containing it. Background technique [0003] As the application range of lithium secondary batteries expands not only to portable electronic devices but also to electric vehicles (EV) and energy storage systems (ESS), there is an increasing demand for lithium secondary batteries with high capacity, high energy density and long life Increase. [0004] Among various lithium secondary batteries, a lithium-sulfur battery uses a sulfur-based material containing a sulfur-sulfur bond as a positive electrode active material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/052
CPCH01M10/0567H01M10/0569H01M10/052H01M4/38Y02E60/10H01M4/5815H01M4/382H01M4/581H01M10/0525H01M2004/027H01M2004/028H01M2300/0037
Inventor 韩东夹朴昶勋孙权男
Owner LG ENERGY SOLUTION LTD