Hyper‐Crosslinking to Customize Ultrathin‐Wall Closed Pores in Pitch‐Derived Carbon for Sodium‐Ion Batteries

Abstract Pitch is a highly preferable and cost‐effective precursor of carbon materials. Nevertheless, its direct pyrolysis typically yields highly graphitized soft carbon, posing challenges to the modulation of closed‐pore architecture, due to intense intermolecular π–π interactions. This results in a negligible plateau capacity and sluggish diffusion kinetics in sodium‐ion batteries (SIBs). In this study, an innovative hyper‐crosslinking strategy is proposed to reconstruct pitch molecularly and precisely tailor the closed‐pore structure of the derived carbon. The crosslinker intertwined the pitch units, transforming the linear molecules into 3D porous polymers. Structurally, these 3D cavities tactfully…

• NN
  National Natural Science Foundation of China

  Awards: 52273250, U24A20207, 52373047
• SU
  Sichuan University

  Award: 2020SCUNG203
• SK
  State Key Laboratory of Polymer Materials Engineering

  Award: sklpme‐2023‐1‐03
• NS
  Natural Science Foundation of Sichuan Province

  Award: No. 2022NSFSC0248