Carbon Nanotube-MOF Sheet, Manufacturing Method Thereof, and Lithium-Sulfur Secondary Battery Including the Same

Lithium-Sulfur Batteries with Polysulfide Shuttle Suppression via Co-MOF-74-Grown CNT Sheets

This technology is an interlayer solution for lithium-sulfur batteries that inserts a carbon nanotube (CNT) sheet, on which the porous metal-organic framework Co-MOF-74 is grown, between the cathode and the separator. This physically and chemically suppresses the lithium polysulfide shuttle effect and accelerates the lithium-sulfur conversion reaction.

Existing issues included active material loss and battery performance degradation caused by the shuttle effect—where lithium polysulfide generated during discharge dissolves into the electrolyte and migrates to the anode—as well as low actual capacity due to inefficient conversion from Li2S2 to Li2S.

By synthesizing Co-MOF-74 with a high specific surface area of 1300–1356 m²/g on multi-walled carbon nanotubes (MWCNT) to create an independent sheet, this technology can be applied to improve the stability and cycle life of cathode materials for lithium secondary batteries.

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Key Features:

• A lithium-sulfur secondary battery comprising a cathode, a separator, an anode, and a sheet positioned independently between the cathode and the separator.
• A sheet formed as a single integrated unit by directly growing a porous metal-organic framework on the surface of carbon nanotubes.
• A configuration where the metal-organic framework grown on the sheet consists of Co-MOF-74, a cobalt-based porous framework.
• A configuration where the sheet between the cathode and the separator physically and chemically suppresses the lithium polysulfide shuttle effect.

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