文献类型：期刊文献

英文题名：Ultrafast heating enables moderate temperature synthesis of hard carbon with tailored microstructure for high-performance sodium-ion batteries

作者：Chen, Wangui;Pan, Weitong[1];Zhao, Lili;Tang, Longfei;Chen, Xueli[1];Wang, Fuchen

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Engn Res Ctr Resource Utilizat Carbon containing W, Minist Educ, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, State Key Lab Coal Liquefact Gasificat & Utilizat, Shanghai 200237, Peoples R China

年份：2026

卷号：334

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20262320860584);WOS:【SCI-EXPANDED(收录号:WOS:001795340800001)】；

基金：This work is supported by National Natural Science Foundation of China (U23A20131 and 22178114) .

语种：英文

外文关键词：Ultrafast heating; Moderate temperature; Hard carbon; Closed pore

摘要：Traditional high-temperature carbonization processes for hard carbon (>1300 degrees C) reduce defects and promote closed-pore formation, but often result in excessive graphitization, pore collapse, and high energy consumption. Achieving high closed-pore content while preventing excessive graphitization remains challenging. This study utilizes flash Joule heating (FJH) at a moderate temperature (1000 degrees C) to induce non-equilibrium processes via ultrafast heating, inducing unique carbon structures: it inhibits the longitudinal ordered stacking of carbon layers, thereby reducing the overall degree of graphitization, while simultaneously promoting the in-plane lateral growth of carbon microcrystals (increased L-a). This lateral growth establishes a continuous carbon skeleton for closed-pore wall construction. Furthermore, the re-deposition of violently released volatile components within the pore channels accelerates the transformation of open pores into closed pores. The resulting material (CSC-FJH-1000) exhibits low specific surface area and high closed-pore content, delivering exceptional electrochemical performance as a sodium-ion battery anode: a reversible capacity of 296 mAh g(-1), initial Coulombic efficiency of 88%, and enhanced plateau capacity of 201 mAh g(-1), outperforming conventional carbonized samples processed at the same temperature. This work provides an energy-efficient preparation route and elucidates the FJH-mediated carbon structural mechanism, establishing a new framework for non-equilibrium synthesis of hard carbon.