Green carbon from bagasse for uniform coating of Fe2O3 nanoparticles toward high-capacity and long-life lithium-ion battery anodes

초록

Sustainable high-performance anodes are essential for next-generation Li-ion batteries (LIBs). In this study, we develop an Fe2O3@C composite in which Fe2O3 nanoparticles are uniformly coated with biomass-derived carbon from bagasse-an abundant agricultural residue. Crystalline cellulose extracted from bagasse serves as a green carbon precursor, enabling the formation of a core-shell nanostructure via a simple sol-gel and pyrolysis route. With an optimized Fe2O3 : C weight ratio of 8 : 2 and a polyacrylic acid binder, the electrode delivers a high reversible capacity of 1893 mA h g-1 after 100 cycles at 0.1 A g-1, retaining 1553 mA h g-1 after 350 cycles at 0.5 A g-1, and exhibits excellent rate capability up to 3 A g-1, outperforming many previously reported Fe2O3-based anodes. This superior performance arises from the synergistic effects of Fe2O3 and the conductive carbon coating, which enhance electron transport, buffer volume expansion, and stabilize the solid electrolyte interphase. This study demonstrates the potential of bagasse valorization for sustainable energy storage and offers a scalable route to high-capacity, long-life LIB anodes, paving the way for eco-friendly and cost-effective electrode production for large-scale applications.

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