Metal oxide-carbonaceous composite, method for manufacturing the same, and lithium-sulfur battery comprising the same

Lithium-sulfur battery composite with enhanced sulfur conversion using a metal oxide catalyst containing mixed amorphous and crystalline phases

This technology enhances the sulfur conversion performance of lithium-sulfur batteries by coating carbonaceous particles with metal oxide, introducing metal cations, and performing heat treatment to create a coexisting amorphous and crystalline phase ratio of 40:60 to 60:40 within the metal oxide.

In lithium-sulfur batteries, lithium sulfide (Li2S) tends to accumulate excessively as a 2D film on the electrode surface during charge/discharge cycles, creating a passivation effect. This limits current efficiency and prevents full utilization of sulfur's high theoretical capacity.

This technology controls catalytic performance by mixing amorphous and crystalline phases of metal oxide in a specific ratio, inducing Li2S to grow as 3D particles rather than a film, which facilitates its dissolution during charging. It can be applied to cathode materials for next-gen high-energy-density batteries, lightweight power sources for drones/UAM, and long-life energy storage cells to improve both discharge capacity and cycle life.

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Key Features:

• A metal oxide-carbonaceous composite comprising carbonaceous particles and a metal oxide present on one side of the carbonaceous particles
• A metal oxide in which amorphous and crystalline phases are mixed, with an area ratio of 40:60 to 60:40
• A step of coating carbonaceous particles with metal oxide, introducing metal cations, and heat-treating to mix amorphous and crystalline phases
• A lithium-sulfur battery comprising an anode, an electrolyte, and a cathode consisting of sulfur and an electrode containing the metal oxide-carbonaceous composite

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