DNA‐Inspired Crosslinked Graphite Flakes Assemblies for Constructing Closed‐Pore in Cellulose‐Derived Hard Carbon

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.