具有TiO2同质结的中空碳纳米纤维实现高性能锂硫电池
High-Performance Li-S Batteries Enabled by Hollow Carbon Nanofibers Hosts with TiO2 Homojunctions
摘要: 通过界面工程和结构调控协同优化锂硫电池正极的设计策略，本工作将良好晶格匹配的锐钛矿/金红石相二氧化钛同质结(A/R-TiO2)嵌入中空管状纳米纤维(HCNF)中，形成一维复合结构(A/R-TiO2-HCNF)，作为锂硫电池正极。其中，A/R-TiO2-HCNF形成的内建电场有效增强多硫化物中间体的化学吸附，同时进一步促进电荷转移，有效降低从液相多硫化物向最终固态产物(Li2S)转化的反应能垒。此外，一维中空管状纳米纤维为离子和电传输提供连续的通道，确保了电荷长程有效传输。得益于此，所制备的正极材料具有高比放电容量(0.2 C, 1186.79 mAh∙g−1)和有优异的倍率能力(1 C，897.83 mAh∙g−1)。本研究通过多级结构与界面工程的协同设计，为优化锂硫电池多相反应动力学与传质过程提供了一定的参考。
Abstract: To optimize the cathode design of lithium-sulfur batteries through the synergistic integration of interfacial engineering and structural regulation, this work embeds an anatase/rutile TiO2 homojunction (A/R-TiO2) with favorable lattice matching into hollow tubular nanofibers (HCNF) to construct a one-dimensional composite structure (A/R-TiO2-HCNF) as the cathode for lithium-sulfur batteries. The built-in electric field formed in A/R-TiO2-HCNF effectively enhances the chemisorption of polysulfide intermediates and further promotes charge transfer, thereby significantly reducing the reaction energy barrier for the conversion of liquid-phase polysulfides to the final solid product (Li2S). In addition, the one-dimensional hollow tubular nanofibers provide continuous pathways for ion and electron transport, ensuring efficient long-range charge transfer. Benefiting from these merits, the as-prepared cathode material delivers a high specific discharge capacity of 1186.79 mAh∙g−1 at 0.2 C and excellent rate capability of 897.83 mAh∙g−1 at 1 C. This synergistic design of hierarchical structure and interfacial engineering provides a valuable reference for optimizing the multiphase reaction kinetics and mass transfer processes in lithium-sulfur batteries.
文章引用：杨迎强, 李新宇, 王恒, 安纪华, 程泓瑞. 具有TiO2同质结的中空碳纳米纤维实现高性能锂硫电池[J]. 物理化学进展, 2026, 15(2): 102-109. https://doi.org/10.12677/japc.2026.152011

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