酚醛树脂改性沥青基硬碳的制备及储钠性能研究
Preparation of hard carbon from phenolic resin modified petroleum asphalt and study on its sodium storage performance
李旭东 1谭晓杰 1刘亚超 1王瑞 1刘钦莲 1赵青山1
作者信息
- 1. 中国石油大学(华东)化学化工学院,山东 青岛 266580
- 折叠
摘要
石油沥青作为炼油副产品被用作多种碳质材料前驱体,但在高温碳化过程中易石墨化,不利于钠离子储存.将酚醛树脂引入硬质沥青共碳化,促进沥青分子与酚醛树脂分子间的交联,抑制碳层熔融重排,得到酚醛树脂改性沥青基硬碳材料.当酚醛树脂添加质量比例为 1∶1时,在 1 200℃碳化所得硬碳材料具有最佳的储钠电化学性能.在 0.05 A/g电流密度下,比容量达 270.2 mAh/g,首次库仑效率为63.8%.在 0.3 A/g电流密度下,循环1 200 圈后容量保持率达71.6%.
Abstract
Hard carbon is regarded as the most promising anode material for sodium-ion batteries(SIBs)due to its high specific capacity and good cyclic stability.As a by-product of oil refining,petroleum asphalt is commonly used as a precursor for various carbonaceous materials.However,its tendency to graphitize during high-temperature carbonization limits its application for sodium-ion storage.To address this issue,the co-carbonization of hard asphalt with phenolic resin is proposed.This strategy promotes cross-linking between asphalt and phenolic resin molecules,preventing carbon layers from melting and rearrangement.Consequently,a hard carbon material based on phenolic resin-modified asphalt is obtained.Notably,the hard carbon material obtained at 1 200℃with a phenolic resin addition ratio of 1∶1 yields the best electrochemical performance for sodium-ion storage,which exhibits a specific capacity of 270.2 mAh·g-1 at a current density of 0.05 A·g-1,and delivers an initial coulomb efficiency(ICE)of 63.8%.Moreover,the capacity retention rate remains at 71.6%even after 1 200 cycles under a current density of 0.3 A·g-1.
关键词
硬质沥青/酚醛树脂/改性/硬碳/钠离子电池Key words
hard asphalt/phenolic resin/modification/hard carbon/sodium-ion battery引用本文复制引用
出版年
2024
NETL
NSTL
万方数据