Lithium ion capacitors (LICs), combining with the advantages of supercapacitors and batteries, are considered as one of the most attractive energy storage devices. The key point of constructing high-performance LICs is to address the sluggish kinetics behavior of battery-type anode. Herein, we demonstrate that nano-MnO with low Li-ion insertion voltage and fast kinetics can be favorably used for LICs. Self-standing hollow carbon-encapsulated MnO nanofibers film (MnO@HCF) is synthesized through a morphology-inheritance route, exhibiting high electrical conductivity, good structural stability, and continuous open channels to facilitate electrolyte ion transportation. Such a synergistic structure endows MnO@HCF with excellent electrochemical properties including a considerably enhanced capacity of 586.8 mAh g⁻¹ at a current density of 0.1 A g⁻¹. The LIC based on the MnO@HCF anode and activated carbon cathode deliver a high energy density of 87.4 Wh kg⁻¹ at 215 W kg⁻¹, under a high mass loading of 7.1 mg cm⁻². Even at an ultrahigh power density of 10750 W kg⁻¹, the energy density can still reach 50.6 Wh kg⁻¹. Additionally, the LIC exhibits a remarkable capacity retention of 98.6% after 3000 cycles at 1075 W kg⁻¹.

锂离子电容器（LICs）结合了超级电容器和电池的优势，被认为是最有吸引力的储能设备之一。构造高性能LIC的关键是解决电池型阳极的缓慢动力学行为。在本文中，我们证明具有低锂离子插入电压和快速动力学的纳米MnO可以有利地用于LIC。自立式中空碳纤维包裹的MnO纳米纤维薄膜（MnO @ HCF）是通过形态学-遗传路线合成的，具有高电导率，良好的结构稳定性和连续的开放通道，有助于电解质离子的运输。这种协同结构赋予MnO @ HCF优异的电化学性能，包括586.8 mAh g ^-1的显着增强的容量。在0.1 A g ^-1的电流密度下。基于MnO @ HCF阳极和活性炭阴极的LIC在7.1 mg cm ^-2的高质量负荷下，在215 W kg ^-1时可提供87.4 Wh kg ^-1的高能量密度。即使在10750 W kg ^-1的超高功率密度下，能量密度仍可以达到50.6 Wh kg ^-1。另外，LIC在1075 W kg ^-1的3000次循环后表现出显着的容量保持率98.6％。