Upcycling Waste Pyrolytic Carbon Black into Sustainable Ultrahigh Performance Anode for Sodium‐Ion Batteries via Multi‐Chemistry and Engineering Synergism

Abstract The study of solid waste‐derived carbon as resource‐sustainable anode materials for high‐performance sodium‐ion batteries (SIBs) is significant for their future commercialization. However, the problematic microstructure tuning and unclear Na storage mechanism, coupled with the large Na + radius and slow diffusion kinetics, resulted in dissatisfactory specific capacity, rate, and durability. Herein, the chemistry and engineering synergistic modulation is employed to achieve expansive interlayer and boosted charge transmissibility of waste tires derived pyrolytic carbon black (CBp) with unprecedented cyclability and high‐rate capacity. The expansive interlayer, pronounced pseudo‐graphitic phases, newly formed B−C coordination, and localized partial electric field (LEF) enable the acceleration of the Na + storage kinetics, increase the conductivity, and form an ultrathin inorganic‐rich solid‐electrolyte interface. The unique slope‐type curve reflects an “adsorption‐intercalation” structural evolution pattern of the surface/near‐surface dominated by capacitive contributions. The BE‐CBp‐1000 exhibits a high reversible capacity of 413 mAh g −1 @ 50 mA g −1 with an incredible 96.9% retention after 5000 cycles at 10 A g −1 , far superior to the recently reported results. Furthermore, the high energy density and outstanding cyclability of the full battery, as well as the techno‐economic analyses, demonstrate the feasibility of engineering solid waste‐derived carbon into ultrahigh‐performance anodes via synergistic strategies.