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| Lignin-derived N, B, and F Tri-doped Carbon Fibers for Improving Electrochemical Performances of Lithium-Sulfur Battery Separators |
| Received:September 18, 2025 Revised:October 06, 2025 |
| DOI：10.11981/j.issn.1000-6842.2025.04.20 |
| Key Words:lignin;lithium-sulfur batteries;carbon nanofibers;electrospinning;lithium polysulfides |
| Fund Project: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）。 |
| Author Name | Affiliation | Postcode | | ZHANG Huanchun* | College of Light Industry & Chemical Engineering， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 | 116034 | | LI Yancen | College of Light Industry & Chemical Engineering， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 | 116034 | | SUN Runcang* | College of Light Industry & Chemical Engineering， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 | 116034 | | HU Shunyou* | College of Light Industry & Chemical Engineering， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 | 116034 |
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| 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. |
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