Oxygen‐Crosslinker Effect on the Electrochemical Characteristics of Asphalt‐Based Hard Carbon Anodes for Sodium‐Ion Batteries

Abstract Because direct carbonation of asphalt usually yields ordered graphite structure with unfavorable storage of sodium. Here, the asphalt preoxidation at a specific temperature in the air introduces oxygen‐containing groups to connect the unsaturated aliphatic hydrocarbon and aromatic side chains, forming a disordered carbon skeleton to inhibit melting and rearrangement during carbonization. The abundant oxygen‐containing groups hinder the growth of the carbon layers during pyrolysis, which promotes the formation of disordered phases and abundant micropores in asphalt‐based hard carbons (HCs). The simultaneous increase in initial coulombic efficiency, capacity, and transport behavior of sodium ions in HCs…

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  Key Research and Development Program of Zhejiang Province

  Award: No. 2022C01071