MXene 与渗硒多孔 N 掺杂碳纳米纤维的协同作用作为高性能钠/锂-硒电池的 Janus 电极,Advanced Energy Materials

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MXene 与渗硒多孔 N 掺杂碳纳米纤维的协同作用作为高性能钠/锂-硒电池的 Janus 电极
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-07-15 , DOI: 10.1002/aenm.202200894
Jiayi Li ₁ , Jianjun Song ₁ , Linqu Luo ₂ , Hongwei Zhang ₁ , Junan Feng ₁ , Xiaoxian Zhao ₃ , Xin Guo ₄ , Hanghang Dong ₅ , Shuangqiang Chen ₅ , Hao Liu ₄ , Guangjie Shao ₆ , Thomas. D. Anthopoulos ₂ , Yaqiong Su ₇ , Fengyun Wang ₁ , Guoxiu Wang ₄

Affiliation

金属硒（M-Se）电池由于其高能量密度和高倍率能力而被认为是下一代电池技术的有希望的候选者。然而，由于多硒化物的穿梭效应，硒正极存在循环性能差和库仑效率低的问题。本文报道了将 Ti ₃ C ₂ T _x MXene 掺入到 Se 渗透的多孔 N 掺杂碳纳米纤维 (PNCNFs) 上，以构建用于高性能 Na-Se 和 Li-Se 的独立式 Janus PNCNFs/Se@MXene 阴极电池。吡咯-N含量的增加和PNCNFs的多孔结构有利于增强对Na _2的吸附硒和减轻穿梭效应。同时，密度泛函理论 (DFT) 计算证明，具有极性界面的二维 Ti ₃ C ₂ T _x MXene 能够有效地化学固定和物理阻断多硒化物，从而抑制穿梭效应。_{Ti 3} C ₂ T _x的独特架构建立在互连纳米纤维之上的 MXene 确保了氧化还原反应的连续电子转移。因此，新型 Janus PNCNFs/Se@MXene 电极在 Na-Se 和 Li-Se 电池中都具有强大的倍率能力和出色的长期循环稳定性。将 2D MXene 用于构建 Janus 电极为硒基正极材料提供了竞争优势，并突出了开发高性能电池的新战略。

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Synergy of MXene with Se Infiltrated Porous N-Doped Carbon Nanofibers as Janus Electrodes for High-Performance Sodium/Lithium–Selenium Batteries

Metal–selenium (M–Se) batteries are considered promising candidates for next-generation battery technologies owing to their high energy density and high-rate capability. However, Se cathode suffers from poor cycling performance and low Coulombic efficiency, owing to the shuttle effect of polyselenides. Herein, it is reported the incorporation of Ti₃C₂T_x MXene onto Se infiltrated porous N-doped carbon nanofibers (PNCNFs) to construct free-standing Janus PNCNFs/Se@MXene cathodes for high-performance Na–Se and Li–Se batteries. The increase of pyrrolic-N content and the porous structure of the PNCNFs is conducive to enhancing the adsorption of Na₂Se and alleviating the shuttle effect. Meanwhile, density functional theory (DFT) calculations have proven that 2D Ti₃C₂T_x MXene with polar interfaces enables the effective chemical immobilization and physical blocking of polyselenides to suppress the shuttle effect. The unique architecture with Ti₃C₂T_x MXene built on top of interlinked nanofiber ensures the continuous electron transfer for redox reaction. As a result, the novel Janus PNCNFs/Se@MXene electrodes deliver robust rate capabilities and superior long-term cycling stability in both Na–Se and Li–Se batteries. The incorporation of 2D MXene to construct Janus electrodes provides a competitive advantage for selenium-based cathode materials and highlights a new strategy for developing high-performance batteries.

更新日期：2022-07-15

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