储能科学与技术2025，Vol.14Issue(11)：4142-4151,10.DOI:10.19799/j.cnki.2095-4239.2025.0364
分子修饰对煤沥青基硬炭材料及其储钠性能的影响
Impact of molecular modification on coal-tar-pitch-derived hard carbon for sodium-ion storage
摘要
Abstract
Developing suitable anode materials is essential for the commercialization of sodium-ion batteries.Coal tar pitch is an inexpensive soft carbon precursor with a high carbon yield;however,its low theoretical sodium storage capacity limits practical application.In this study,a molecular modification strategy is proposed,involving grafting various functional groups onto pitch molecules via electrophilic substitution reactions.This approach suppresses melting and rearrangement during carbonization,ultimately yielding hard carbon materials with enlarged interlayer spacing.The modified pitch is characterized by FT-IR and XPS to determine functional group composition.The morphology,microstructure,and pore structure of the resulting carbons are investigated using SEM,TEM,XRD,Raman spectroscopy,and N2/CO2 adsorption-desorption analyses.The effect of crosslinker content on the derived hard carbon structure is systematically examined by varying the crosslinking agent dosage.Sodium storage performance is evaluated through galvanostatic charge-discharge(GCD)tests,and the storage mechanism is further elucidated using cyclic voltammetry and the galvanostatic intermittent titration technique.The optimal performance is achieved at a 2:3 pitch/crosslinker ratio,delivering 291.4 mAh/g at 0.03 A/g(93%initial Coulombic efficiency)and 242.6 mAh/g after 300 cycles at 1 A/g with 95.6%retention.关键词
煤沥青/硬炭/负极材料/钠离子电池Key words
coal tar pitch/hard carbon/anode/sodium-ion battery分类
化学工程引用本文复制引用
郭世龙,宋金,郭佳乐,王潇潇,梁可盈,王毅林,易宗琳,谢莉婧,卫贤贤..分子修饰对煤沥青基硬炭材料及其储钠性能的影响[J].储能科学与技术,2025,14(11):4142-4151,10.基金项目
山西省基础研究计划(202203021211203) （202203021211203）
太原科技大学博士启动基金(20232124) （20232124）
国家自然科学基金青年基金(62304209) （62304209）
山西省青年科技研究基金(20210302123203),中央引导地方科技发展资金项目(YDZJSX2025C027) （20210302123203）
