新型炭材料（中英文）2025，Vol.40Issue(3)：651-665,15.DOI:10.1016/S1872-5805(25)60979-6
软炭包覆优化孔结构和表面化学提升硬炭的高倍率储钠性能
Changing the pore structure and surface chemistry of hard carbon by coating it with a soft carbon to boost high-rate sodium storage
摘要
Abstract
Changes to the microstructure of a hard carbon(HC)and its solid electrolyte interface(SEI)can be effect-ive in improving the electrode kinetics.However,achieving fast charging using a simple and inexpensive strategy without sacrificing its initial Coulombic efficiency remains a challenge in sodium ion batteries.A simple liquid-phase coating approach has been used to generate a pitch-derived soft carbon layer on the HC surface,and its effect on the porosity of HC and SEI chemistry has been studied.A vari-ety of structural characterizations show a soft carbon coat-ing can increase the defect and ultra-micropore contents.The increase in ultra-micropore comes from both the soft carbon coat-ings and the larger pores within the HC that are partially filled by pitch,which provides more Na+storage sites.In-situ FTIR/EIS and ex-situ XPS showed that the soft carbon coating induced the formation of thinner SEI that is richer in NaF from the electrolyte,which stabilized the interface and promoted the charge transfer process.As a result,the anode produced fast-charging(329.8 mAh g-1 at 30 mA g-1 and 198.6 mAh g-1 at 300 mA g-1)and had a better cycling performance(a high capacity retention of 81.4%after 100 cycles at 150 mA g-1).This work reveals the critical role of coating layer in changing the pore structure,SEI chemistry and diffusion kinetics of hard carbon,which enables rational design of sodium-ion battery anode with enhanced fast charging capability.关键词
硬炭/沥青衍生炭包覆/钠离子电池/孔结构/表面化学Key words
Hard carbon/Pitch-derived carbon coating/Sodium-ion batteries/Pore structure/Surface chemistry分类
化学化工引用本文复制引用
钟琴,高鹏,杨乐之,刘继磊,莫英,周望,郑彪,吴剑芳,刘国库,Mohd Zieauddin Kufian,Osman Zurina,徐雄文..软炭包覆优化孔结构和表面化学提升硬炭的高倍率储钠性能[J].新型炭材料（中英文）,2025,40(3):651-665,15.基金项目
This work was financially supported by the Na-tional Key Research and Development Program of China(2022YFE0206300),National Natural Science Foundation of China(U21A2081,22075074,22209047),Guangdong Basic and Applied Basic Re-search Foundation(2024A1515011620),Hunan Pro-vincial Natural Science Foundation of China(2024JJ5068),and Foundation of Yuelushan Center for Industrial Innovation(2023YCII0119). 国家重点研发计划(2022YFE0206300) （2022YFE0206300）
国家自然科学基金(U21A2081、22075074、22209047) （U21A2081、22075074、22209047）
广东省基础与应用基础研究基金(2024A1515011620) （2024A1515011620）
湖南省自然科学基金(2024JJ5068) （2024JJ5068）
岳麓山工业创新中心重点项目(2023YCII0119). （2023YCII0119）
