文献类型：期刊文献

中文题名：硫掺杂沥青基硬碳的制备及其储锂性能研究

英文题名：Preparation of Sulfur-Doped and Pitch-Based Hard Carbon and Its Lithium-Ion Storage Performance

作者：梁桥玲[1];张永正[1];马成[2];王际童[1];乔文明[1];凌立成[1]

机构：[1]华东理工大学化工学院化学工程与低碳技术全国重点实验室,上海200237;[2]华东理工大学材料科学与工程学院,特种功能高分子材料及相关技术教育部重点实验室,上海200237

年份：2025

卷号：51

期号：4

起止页码：460

中文期刊名：华东理工大学学报(自然科学版)

外文期刊名：Journal of East China University of Science and Technology

收录：;北大核心:【北大核心2023】；

基金：国家自然科学基金(U21A2060,22178116);中央高校基本科研业务费专项(JKD01231701)。

语种：中文

中文关键词：硬碳;沥青;硫掺杂;锂离子电池;倍率性能

外文关键词：hard carbon;pitch;sulfur-doping;lithium-ion battery;rate performance

摘要：基于共碳化过程中含硫聚合物与沥青的反应性交联以及热解含硫小分子对沥青原料的硫掺杂,以高软化点沥青为原料,二聚环戊二烯与硫单质共聚物作为含硫交联剂,实现了含硫沥青基硬碳材料的制备及其可控硫掺杂,并进行了其储锂性能以及机制研究。结果表明,当沥青原料与含硫聚合物的质量比为6∶1时,所制备的硫掺杂沥青基硬碳具有较大的层间距以及合适的孔结构,在50 mA/g电流密度下可实现398 mA·h/g的可逆比容量和73.0%的首次库仑效率,且硫掺杂可提升锂离子的扩散速率,实现在4000 mA/g电流密度下176 mA·h/g的优异倍率性能。
Hard carbon is regarded as one of the most promising anode materials for lithium-ion batteries due to its high specific capacity.However,the commercial application of hard carbon is severely hampered by its poor rate performance and first Coulombic efficiency.Herein,sulfur-doped pitch-based hard carbon materials were prepared through co-carbonization of high-softening-point pitch precursor and sulfur-rich crosslinking agent from the copolymerization of sulfur and dicyclopentadiene.It was found that the crosslinking between the pitch precursor and sulfur-rich polymer,as well as sulfur-doping during the co-carbonization process,could tailor the microscopic crystal structure of the hard carbons.Notably,when the mass ratio of pitch precursor to sulfur polymer was 6∶1,the as-prepared hard carbons with suitable microcrystalline layer spacing and pore structure showed a reversible capacity of 398 mA·h/g with a 73.0%first Coulombic efficiency at 50 mA/g,and a superior rate performance of 176 mA·h/g at 4000 mA/g,which originated from sulfur-doping and rich microcrystal defects.