Method for manufacturing a secondary battery active material containing carbon black produced via waste pyrolysis and plasma reforming, and the secondary battery active material produced thereby

Low-cost anode active material using carbon black from electromagnetic pyrolysis and plasma reforming of waste

This technology produces an anode active material for secondary batteries with improved crystallinity and electrical conductivity without the need for additional carbon precursors by heat-treating plate-structured carbon black, obtained from the pyrolysis and microwave plasma reforming of waste, at temperatures of 900°C or higher.

Conventional artificial graphite requires hydrocarbon precursors and expensive carbonization processes. Furthermore, there is a need to recycle carbon compounds (char) generated during waste treatment, and existing active materials have limitations in achieving high power and high efficiency.

This technology involves pre-treating waste via hydrolysis, pyrolyzing it with electromagnetic waves, separating gas and carbon black using a microwave plasma torch, and heat-treating the reformed carbon black at 900°C or higher to optimize crystallinity and specific surface area. Applicable to waste tire and plastic recycling and high-power lithium-ion battery supply chains, it enables simultaneous waste treatment revenue and reduced anode material costs.

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Key Features:

• Step 1: Pyrolyzing pre-hydrolyzed, powdered waste using an electromagnetic pyrolyzer to produce decomposition products
• Step 2: Plasma-treating the decomposition products with a microwave plasma torch and separating the generated gas from the plasma-reformed carbon black
• Step 3: Heating the plasma-reformed carbon black to at least 900°C, maintaining it for at least one hour, and cooling it naturally
• Step 4: Producing a secondary battery active material with a BET specific surface area of 0.01–5 m2/g, including the heat-treated plate-structured carbon black

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This invention was developed with support from the Ministry of Education for technology producing syngas through plasma-based waste gasification.

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