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Carbon-based fiber sheet and lithium-sulfur battery including same

A carbon-based fiber and lithium-sulfur battery technology, applied in lithium batteries, batteries, fiber treatment, etc., can solve problems such as lithium metal negative electrode corrosion, achieve the effects of inhibiting diffusion, improving capacity and life characteristics, and preventing diffusion

Pending Publication Date: 2018-09-28
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, in addition to being suspended or deposited in the electrolyte, lithium polysulfides diffused into the negative electrode also directly react with lithium and form Li 2 The form of S adheres to the surface of the negative electrode, thereby causing corrosion of the lithium metal negative electrode

Method used

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  • Carbon-based fiber sheet and lithium-sulfur battery including same
  • Carbon-based fiber sheet and lithium-sulfur battery including same
  • Carbon-based fiber sheet and lithium-sulfur battery including same

Examples

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Embodiment 1

[0128] The carbon-based fiber sheet prepared in the above preparation example was used to prepare a lithium-sulfur battery.

[0129] First, a positive electrode mixture composed of 80% by weight of sulfur / carbon composite, 10% by weight of carbon black as a conductive material, and 10% by weight of PVDF (binder) was added to the solvent NMP (N-methyl-2- Pyrrolidone) to prepare positive electrode slurry. The positive electrode slurry was coated on an aluminum current collector with a thickness of 20 μm and dried to prepare a positive electrode for a lithium-sulfur battery with a thickness of 150 μm.

[0130] A lithium foil with a thickness of about 150 μm was used as the negative electrode, and a polyethylene with a thickness of 20 μm was used as the separator.

[0131] After stacking in the order of positive electrode, carbon-based fiber sheet, separator and negative electrode, inject dimethoxyethane, dioxolane and diglyme (volume ratio 14:65:21) as electrolyte Mixed solvent (1M Li...

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Abstract

The present invention relates to a carbon-based fiber sheet and a lithium-sulfur battery including the same. According to the present invention, a carbon-based fiber sheet for a lithium-sulfur batteryis doped with highly concentrated nitrogen so as to perform roles of adsorbing lithium polysulfide eluted from a cathode during charging or discharging and of preventing the diffusion thereof, such that a shuttle reaction is suppressed, thereby enabling capacity and lifespan characteristics of a lithium-sulfur battery to improve.

Description

Technical field [0001] This application claims the priority and rights of Korean Patent Application No. 10-2016-0068855 filed on June 2, 2016 and Korean Patent Application No. 10-2017-0031126 filed on March 13, 2017, and is incorporated by reference Way to incorporate all of its content into this article. [0002] The present invention relates to a carbon-based fiber sheet with excellent adsorption effect on lithium polysulfide and a lithium-sulfur battery containing the same. Background technique [0003] In recent years, with the rapid development of miniaturization and weight reduction of electronic products, electronic devices, communication devices, etc., and the substantial increase in demand for electric vehicles due to environmental issues, the performance of secondary batteries used as power sources for these products has increased significantly. The need for improvement is also increasing. Among them, lithium secondary batteries have attracted significant attention as h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/10H01M10/42H01M10/052D01F9/22H01M50/403H01M50/431H01M50/489H01M50/491
CPCD01F9/22H01M10/052D01D5/003D01F9/20H01M2220/20Y02E60/10H01M50/431H01M50/44H01M50/403H01M50/491H01M50/489C01B32/05H01M10/4235C01P2006/16H01M4/366H01M4/136D06M23/06D06M13/322D01D5/0038D01D5/20D01F9/145D04H1/4242D04H1/728H01M4/133H01M4/5815H01M4/583H01M4/806H01M10/0525
Inventor 金伦耕金泽京孙权男梁斗景任美罗
Owner LG ENERGY SOLUTION LTD
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