煤炭转化2025，Vol.48Issue(4)：82-94,13.DOI:10.19726/j.cnki.ebcc.202504008
以海藻酸钠为造孔剂制备高性能煤基硬炭的研究
Preparation of high-performance coal-based hard carbon using sodium alginate as a pore-forming additive
摘要
Abstract
Pre-treatment methods such as modification or oxidative cross-linking can expand the interlayer spacing of coal-based hard carbon and enhance its specific capacity.However,these methods often result in a high proportion of open pores,leading to reduced initial coulomb efficiency(ICE),which restricts their practical application.Sodium alginate can act as an activating and pore-forming agent for coal-based hard carbon through self-decomposition during the heating process.Therefore,in this study,hard carbon was prepared using Xinjiang long-flame coal as a precursor and sodium alginate as the pore-forming agent via a process of acid washing and purification,mixing,low-temperature activation,and high-temperature carbonization.The process was further optimized by adjusting the ratio of sodium alginate to coal powder as well as the activation temperature.The micro-structure of hard carbon was characterized by Raman spectroscopy,XPS and XRD,the pore structure of hard carbon was obtained by low-temperature adsorption and desorption of N2/CO2,and the electro-chemical properties of the coal-based hard carbon samples were evaluated by CR2032 button-type bat-teries.The results show that sodium alginate generates a large number of open pores in the intermedi-ate product during the low-temperature stage,which subsequently transform into closed pores during the high-temperature carbonization process.When the mass ratio of raw coal to pore-forming additive was 1∶2 and the activation temperature was 750 ℃,the hard carbon achieved a reversible specific capacity of 323 mAh/g and an ICE of 91％,with excellent rate capacity and cycling performance.关键词
硬炭/造孔剂/工艺优化/孔隙结构/钠离子电池Key words
hard carbon/pore-forming additive/process optimization/pore structure/sodium ion batteries分类
化学化工引用本文复制引用
解炜,惠功领,刘志芳,王一平,谢莉婧,苏方远,李晓明..以海藻酸钠为造孔剂制备高性能煤基硬炭的研究[J].煤炭转化,2025,48(4):82-94,13.基金项目
中国中煤重点科技项目(20241CS012). （20241CS012）
