This technology utilizes waste coffee grounds as both a carbon source and a reducing agent to produce metal (Ge, Sn, etc.)-carbon composite anode active materials through complex formation with metal oxides and a single heat treatment process.
Existing methods involving the heat treatment of metal oxides alone suffer from incomplete reduction, resulting in low electrochemical performance (specific capacity) as anode active materials, while previous coffee ground recycling technologies have faced economic challenges due to complex high-purity carbon refining processes.
This technology simplifies the process by mixing metal oxides with dried coffee grounds in a 7:3 weight ratio, performing ultrasonic treatment with a dispersion medium, and conducting heat treatment at temperatures between 500°C and 700°C in a nitrogen/hydrogen atmosphere to simultaneously achieve carbonization and reduction. By producing a composite in which metal is uniformly dispersed within an amorphous carbon matrix, this method can be applied to secondary battery anode materials, contributing to process simplification and cost reduction.
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