Method for Manufacturing Cathode Active Material and Cathode Active Material

Method for Manufacturing Cathode Active Material with Suppressed Shuttling via Sulfur Loading in Mesopores

This technology suppresses lithium polysulfide shuttling and improves conductivity by forming metal sulfides within a porous carbon structure and loading sulfur into the mesopores created by selectively etching metal nanoparticles.

Existing challenges included the low conductivity of sulfur, battery performance degradation due to lithium polysulfide dissolution (shuttling), and limited sulfur loading capacity caused by the structural limitations of conventional porous carbon materials.

By proposing a step-by-step manufacturing process (precursor synthesis → carbonization → sulfurization → etching → sulfur synthesis)—which involves sulfurizing a metal-carbon composite and then removing residual metal particles with an acidic solution to secure mesopores for sulfur loading—this technology offers a practical solution for developing next-generation lithium secondary battery cathode materials.

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Key Features:

• Synthesizing a precursor containing metal and carbon compounds to form a cathode active material
• Carbonizing the synthesized precursor in an inert atmosphere to produce a metal-carbon composite
• Sulfurizing the metal-carbon composite in a sulfur atmosphere to produce a metal-metal sulfide-carbon composite
• Suppressing polysulfide shuttling by loading sulfur into mesopores formed by etching metal nanoparticles

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