| 张换春,李彦岑,孙润仓,胡顺友.N, B, F三元共掺杂木质素基碳纤维改性锂硫电池隔膜电化学性能[J].中国造纸学报,2025,40(4):20-30 |
 二维码(扫一下试试看!) |
| N, B, F三元共掺杂木质素基碳纤维改性锂硫电池隔膜电化学性能 |
| Lignin-derived N, B, and F Tri-doped Carbon Fibers for Improving Electrochemical Performances of Lithium-Sulfur Battery Separators |
| 投稿时间:2025-09-18 修订日期:2025-10-06 |
| DOI:10.11981/j.issn.1000-6842.2025.04.20 |
| 中文关键词: 木质素 锂硫电池 碳纳米纤维 静电纺丝 多硫化锂 |
| Key Words:lignin lithium-sulfur batteries carbon nanofibers electrospinning lithium polysulfides |
| 基金项目:大连工业大学引进人才科研启动经费项目(LJBKY2024031,LJBKY2025018);辽宁省博士科研启动基金计划项目(2025-BS-0464);中国科协青年人才托举工程项目(2024QNRC0555)。 |
|
| 摘要点击次数: 48 |
| 全文下载次数: 23 |
| 中文摘要: |
| 本研究采用碱木质素为原料,通过引入离子液体并结合静电纺丝技术,成功制备了氮(N)、硼(B)、氟(F)三元共掺杂的碳纳米纤维(NBFCNF),并将其与商业聚丙烯(PP)隔膜结合,用于制备功能化界面层(NBFCNF/PP)。通过扫描电子显微镜、接触角测量等表征手段,并结合循环伏安、恒流充放电、交流阻抗等电化学分析,重点探究了NBFCNF/PP锂硫电池隔膜的微观孔隙结构、导电网络构建、界面化学特性及多硫化锂反应动力学。结果表明,在高硫负载(5.0与6.5 mg/cm2)条件下,NBFCNF/PP锂硫电池在200次充放电循环后,分别实现了673和577 mAh/g的放电比容量;在电流密度0.2 C下循环200次后,该电池仍可保持963.5 mAh/g的放电容量(容量保持率73%),显著优于PP锂硫电池。NBFCNF/PP锂硫电池能够有效地化学吸附多硫化锂分子,抑制其穿梭效应,提升界面反应动力学,并显著改善电池的循环稳定性与倍率性能。 |
| Abstract: |
| In this study, alkali lignin was employed as raw material to synthesize nitrogen, boron, and fluorine ternary-doped carbon nanofiber (NBFCNF) via ionic liquid-assisted electrospinning. The NBFCNF was integrated onto commercial polypropylene (PP) separators to construct a functional interfacial layer (NBFCNF/PP). The microporous structure, conductive network formation, interfacial chemical properties, and lithium polysulfide reaction kinetics of separators for lithium-sulfur batteries were systematically investigated, using scanning electron microscopy, contact angle measurements, cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The results showed that under high sulfur loadings (5.0 and 6.5 mg/cm2), lithium-sulfur batteries with NBFCNF/PP separators delivered discharge capacities of 673 and 577 mAh/g, respectively, after 200 charge-discharge cycles. At current density of 0.2 C, the batteries retained a discharge capacity of 963.5 mAh/g after 200 cycles, corresponding to a capacity retention of 73%, significantly outperforming lithium-sulfur batteries with PP separators. The effective chemical adsorption of lithium polysulfides was caused by the NBFCNF/PP separator, which suppressed the shuttle effect, accelerates interfacial reaction kinetics, and markedly improved cycling stability and rate capability. |
| 查看全文 查看/发表评论 下载PDF阅读器 HTML |