Core-shell Mn₃O₄/carbon (Mn₃O₄@C) hybrid fiber are synthesized by encapsulating Mn₃O₄ nanoparticles (NPs) in the hollow carbon fibers (Mn₃O₄@HCFs) according to the coaxial electrospinning technique. As the aqueous Zinc ion battery (ZIBs) cathode, the well-defined Mn₃O₄@HCFs with 12.7 wt % carbon exhibits superior rate capability (215.8 and 115.7 mAh g⁻¹ at 0.3 and 2.0 A g⁻¹, respectively) and excellent cycling stability (225 mAh g⁻¹ remaining at the current density of 400 mA g⁻¹ after 1300 cycles). The outstanding electrochemical performances are attributed to the core-shell structure of the Mn₃O₄@HCFs with much void spaces. The carbon framework on the surface of the Mn₃O₄ NPs can not only relieve the volume expansion of Mn₃O₄ during the discharging, but also optimize the electron transportation inside these fibers for the electrode. Furthermore, the amorphous carbon shell could also reduce the dissolution of the Mn₃O₄ NPs during cycling. This work will provide a new pathway of a technique for enhancing the manganese-based cathode materials for the high-powered rechargeable aqueous ZIBs.

根据同轴电纺技术，通过将Mn ₃ O ₄纳米粒子（NPs）包裹在中空碳纤维（Mn ₃ O ₄ @HCFs）中，合成核-壳Mn ₃ O ₄ /碳（Mn ₃ O ₄ @C）杂化纤维。。作为水性锌离子电池（ZIBs）阴极，碳含量为12.7 wt％的定义明确的Mn ₃ O ₄ @HCFs具有优异的倍率性能（分别在0.3和2.0 A g ^-1时分别为215.8和115.7 mAh g ^-1）和。优异的循环稳定性（225毫安克^-1剩余在400毫安克的电流密度^-11300次循环后）。出色的电化学性能归因于Mn ₃ O ₄ @HCFs的核-壳结构，具有很大的空隙空间。Mn ₃ O ₄ NPs表面的碳骨架不仅可以缓解放电过程中Mn ₃ O ₄的体积膨胀，而且可以优化电极内部这些纤维内部的电子传输。此外，无定形碳壳还可以减少循环过程中Mn ₃ O ₄ NPs的溶解。这项工作将为增强高功率可充电水性ZIBs的锰基阴极材料提供新的技术途径。