文献类型：期刊文献

英文题名：Diffusion-restricted volatile release drives secondary cracking to engineer low-surface-area hard carbon

作者：Chen, Wangui[1,2,3];Pan, Weitong[1,2,3];Zhao, Lili[1,2,3];Tang, Longfei[1,2,3];Ding, Lu[1,2,3];Chen, Xueli[1,2,3];Wang, Fuchen[1,2,3]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Engn Res Ctr Resource Utilizat Carbon Containing W, Minist Educ, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, State Key Lab Coal Liquefact Gasificat & Utilizat, Shanghai 200237, Peoples R China

年份：2026

卷号：407

外文期刊名：FUEL

收录：;EI(收录号：20254719528051);WOS:【SCI-EXPANDED(收录号:WOS:001622725200001)】；

基金：This study was financially supported by the National Natural Science Foundation of China (U23A20131) and the Fundamental Research Funds of the Central University (JKCB1241102) .

语种：英文

外文关键词：Low-surface-area; Hard carbon; Packing thickness; Volatile diffusion; Deposition

摘要：Low specific surface area (SSA) in hard carbon anodes is crucial for enhancing the initial Coulombic efficiency (ICE) and reversible capacity of sodium-ion batteries (SIBs). Conventional strategies for SSA reduction within high-temperature carbonization processes often rely on additional energy-intensive thermal treatments or complex processes, presenting significant barriers to practical application. This study introduces a simplified and effective approach that operates within a standard high-temperature framework (1300 degrees C) by solely controlling the packing thickness of coconut shell char (CSC) precursors. Increased packing thickness induces diffusional resistance, hindering volatile release and achieving a volatile release reduction of 7.68 %. This confinement effect promotes in-situ secondary cleavage of volatiles, accelerating carbon deposition and reducing surface defects. Consequently, SSA decreases significantly by 71.52 %, while closed pore formation is enhanced. The optimized CSC-HPT-1300 exhibits dramatically improved electrochemical performance over the low-packing-thickness control, achieving a 15.48 % higher ICE (85 %), a 15.39 % increase in reversible capacity (280 mAh g-1), and a 25.90 % enhanced plateau capacity (209 mAh g-1). Furthermore, this strategy concurrently increases carbonization mass yield by 4.64 %. This thickness-controlled carbonization presents a straightforward and scalable optimization to standard high-temperature processing for fabricating low-surface-area hard carbons, advancing sustainable SIBs development.