Rapid Closed Pore Regulation of Biomass‐derived Hard Carbons Based on Flash Joule Heating for Enhanced Sodium Ion Storage

Abstract Closed pores are essential for enhancing the low‐potential (<0.1 V) plateau capacity and initial Coulombic efficiency of hard carbon (HC) anode materials for energy‐dense sodium‐ion batteries. However, the lack of simple and effective closed‐pore construction strategies has severely hindered their future commercialization. Herein, a rapid closed‐pore regulation strategy for biomass‐derived HCs is proposed through pre‐heat treatment followed by flash Joule heating (FJH). The pre‐heat treatment is critical for transforming vulnerable biomass into high‐carbonizability frameworks that are resistant to over‐graphitization. FJH treatment helps to generate enriched closed pores surrounded by the resulting…

• NN
  National Natural Science Foundation of China

  Awards: 52473220, 52322203
• FR
  Fundamental Research Funds for the Central Universities
• KR
  Key Research and Development Projects of Shaanxi Province

  Award: 2024GH‐ZDXM‐21