Hard carbons have emerged as one of the most promising candidates for high capacity anode materials in sodium-ion batteries (SIB). It has been demonstrated that the degree of graphitization, disorder, and porosity of obtained hard carbons have an enormous effect on capacity. Various biomass precursors (banana peels, peanut shells, leaves, etc.) have been used for obtaining hard carbons, which have shown promising results as SIB anodes.
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