文献类型：期刊文献

英文题名：Dynamic hydrogen-oxygen exchange modulation: Defect engineering boosts anode performance for sustainable sodium-ion batteries

作者：Yue, Chengyan[1,2,3];Pan, Weitong[1,2,3];Zhao, Lili[1,2,3];Tang, Longfei[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, 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：170

外文期刊名：JOURNAL OF ENERGY STORAGE

收录：;EI(收录号：20262320828869);WOS:【SCI-EXPANDED(收录号:WOS:001784980800001)】；

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：Sodium-ion batteries; Hard carbon; Cross-linked structure; Defect engineering; Diffusion kinetics

摘要：Biomass-derived hard carbon anodes have emerged as promising candidates for sodium-ion batteries (SIBs) owing to their inherent porous architectures and cost-effectiveness. However, single-biomass carbonization yields materials with sparse surface functionalities and micro-porous-dominated architectures, fundamentally limiting reversible specific capacity and initial coulombic efficiency. To address these challenges, this study proposes a hydrogen/oxygen (H/O) co-regulation strategy via controlled co-pyrolysis of polyethylene terephthalate (PET) and coconut shell pre-carbide (CSC). The introduction of PET drives the reconstruction of a three-dimensional C-C cross-linked network, formed through covalent bonding between PET-derived aromatic clusters and CSC fragments, while simultaneously introducing sp3-hybridized carbon bridges and topological defects at crystallite interfaces. The optimized carbon matrix achieves a defect density of 1.7 & times; 1015 spins g-1 (7.7 times enhancement), directly correlated with improved sodium-ion adsorption in the slope region (105 mAh g-1) and a total reversible capacity of 308 mAh g-1, surpassing CSC-derived hard carbon (284 mAh g-1) by 8.5%. Additionally, the robust three-dimensional cross-linked architecture maintains structural integrity during cycling, enabling 99% capacity retention over 100 cycles and a high initial coulombic efficiency (ICE) of 89%.