化工学报2024，Vol.75Issue(3)：1019-1027,9.DOI:10.11949/0438-1157.20240071
双功能活化制备沥青基硬炭用于钠离子电池负极
Preparation of pitch-based hard carbon by bi-functional activation strategy for sodium-ion batteries
摘要
Abstract
As the most promising anode material for sodium-ion batteries(SIBs),hard carbon has been widely studied and focused on its controllable adjustment of morphology and structural optimization.Herein,a novel bifunctional activation strategy was developed to prepare the hard carbon materials with highly disordered structures as anode for SIBs by using coal tar pitch as precursors with the help of potassium citrate monohydrate(C6 H5 K3 O7·H2 O).It is believed that the C6 H5 K3 O7·H2 O has a dual role:(1)its gas decomposition products can consume excessive hydrogen and further realize solid pyrolysis of pitch precursors,preventing the formation of ordered microcrystals;(2)the solid decomposition products(potassium salt)act as activating agents to introduce rich closed nanopores into the carbon matrix during high-temperature carbonization.Interestingly,the microstructure of pitch-based hard carbon can be optimized by tuning the amount of activating agents.Furthermore,the electrochemical performance investigations revealed that the as-optimized hard carbon(HC-2-1300)delivers a reversible specific capacity of 214.2 mAh·g-1 at 0.1 A·g-1 with an initial coulombic efficiency of as high as 81.5%,which is superior to that of directly carbonized samples(DC-1300).In addition,there is still a high reversible specific capacity of 116.7 mAh·g-1 at 5 A·g-1 and good cycling stability with a capacity retention rate of 75.1%over 2000 cycles,highlighting the great potential of pitch-based hard carbon anodes for SIBs.关键词
钠离子电池/沥青基硬炭/双功能活化剂/电化学性能Key words
sodium-ion batteries/pitch-based hard carbon/bi-functional activating agent/electrochemical performance分类
化学化工引用本文复制引用
吴吉昊,陈涛,刘思宇,刘梦柯,杨卷..双功能活化制备沥青基硬炭用于钠离子电池负极[J].化工学报,2024,75(3):1019-1027,9.基金项目
国家自然科学基金项目(22278328) （22278328）
陕西省重点研发计划项目(2023-YBGY-292) （2023-YBGY-292）
