With the rapid development of flexible electronic devices, current flexible energy storage devices face great challenge of achieving both high energy and power density. Exploiting ion capacitor is an intelligent way to improve the energy density without sacrificing the power density by utilizing the battery and capacitor-type energy storage mechanism. For the inspiration, a new flexible zinc-ion capacitor (FZIC) based on δ-MnO₂@carbon cloth (δ-MnO₂@CAC) battery-type cathode and MXene@cotton cloth (MXene@COC) capacitor-type anode has been designed and realized. The δ-MnO₂@CAC//MXene@COC system in aqueous liquid electrolyte exhibits excellent electrochemical performance, e.g. a high energy density of 90 Wh kg⁻¹ (power density of 239 W kg⁻¹) and a high power density of 3838 W kg⁻¹ (energy density of 26.8 Wh kg⁻¹), a high capacitance retention of ~80.7% of its initial capacitance after 16,000 cycles and a high Coulomb efficiency of above 93.6% during all the cycles. Moreover, after being assembled by aqueous gel electrolyte, the FZIC also shows the superior electrochemical performance and excellent flexibility. This study of the FZIC provides an efficient way to develop the next-generation flexible energy storage devices with high performance.

随着柔性电子设备的快速发展，当前的柔性储能设备面临着实现高能量和功率密度的巨大挑战。利用离子电容器是一种利用电池和电容器类型的储能机制在不牺牲功率密度的情况下提高能量密度的智能方法。为灵感，一个新的灵活锌离子电容器（FZIC）基于δ-的MnO ₂ @carbon布（δ-的MnO ₂ @CAC）电池型阴极和MXene @棉布（MXene @ COC）电容器型阳极具有被设计和实现。将δ的MnO ₂ @ CAC // MXene @ COC系统在水电解液显示出优异的电化学性能，例如90°的高能量密度瓦千克^-1（功率密度为239 W kg ^-1）和3838 W kg ^-1的高功率密度（26.8 Wh kg ^-1的能量密度），在16,000次循环后其初始电容的〜80.7％的高电容保持率和在所有循环中库仑效率均高于93.6％。此外，在通过水性凝胶电解质组装后，FZIC还显示出优异的电化学性能和出色的柔韧性。FZIC的这项研究为开发高性能的下一代柔性储能设备提供了一种有效的方法。