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Abstract Inspired by DNA cross‐linking, this study proposes an ultra‐cross‐linking molecular splicing strategy to construct a hard carbon anode using discarded experimental fabrics (AT). Through thermal treatment in air, the carboxyl groups on the cellulose side chains undergo condensation with hydroxyl groups, forming a highly cross‐linked super‐long graphite sheet assembly. During the carbonization process, this structure transforms into a highly twisted graphite lattice, forming a closed ultra‐micro‐porous structure. The resulting hard carbon anode exhibits excellent performance: the low‐voltage plateau capacity reaches 322 mAh g −1 , the initial efficiency is 91.5%, and the capacity retention after 1900 cycles at 2 A g −1 is 91.4%. The assembled all‐cell battery achieves an energy density of 210 Wh kg −1 . This study reveals the mechanism of closed pore formation at the molecular level, providing new ideas for the design of hard carbon anodes for sodium‐ion batteries.
Xu et al. (Tue,) studied this question.