Abstract As an emerging energy storage device, supercapacitor is widely investigated owing to its excellent capability, quick charge-discharge and tremendous cycle life. The operation potential window, energy density and mass loading of supercapacitor must be taken into deep consideration for its practical application. In this work, an outstanding electrode based on CFF@V2O5 nanosheets was prepared. Then a free-standing asymmetric supercapacitor with CFF@V2O5 composite as positive electrode and CFF@AC as negative electrode was assembled. Owing to the functional groups produced on CFF after the activation, V2O5 nanosheets was immobilized. The composite exhibits remarkable specific capabilities of 1465 mF cm−2 (492 F g−1). The energy density of the assembled free-standing asymmetric supercapacitor achieves 0.928 mWh cm−3 when the power density is 17.5 mW cm−3. After 6000 charging-discharging cycles as under normal, bended and anti-bended conditions for respective 2000 cycles, the device retains 89.7% of the initial capacitance, exhibiting fascinating cycle stabilization. Finally, two devices linked series can lighten a LED of 1.8 V for 2 min after charging for 2.5 min, which is inspiring for the practical application and production of self-supporting asymmetric supercapacitors.

中文翻译：

---

组装在 3D 碳纤维毡上的 V2O5 纳米片作为具有显着能量密度的柔性非对称超级电容器的独立电极

摘要 作为一种新兴的储能器件，超级电容器以其优异的容量、快速的充放电和极长的循环寿命而被广泛研究。超级电容器的实际应用必须深入考虑其工作电位窗口、能量密度和质量负载。在这项工作中，制备了一种基于 CFF@V2O5 纳米片的出色电极。然后组装了一个以 CFF@V2O5 复合材料为正极，CFF@AC 为负极的自立式非对称超级电容器。由于活化后在 CFF 上产生的官能团，V2O5 纳米片被固定。该复合材料表现出 1465 mF cm-2 (492 F g-1) 的显着比容量。当功率密度为 17 时，组装的独立式非对称超级电容器的能量密度达到 0.928 mWh cm-3。5 mW cm−3。在正常、弯曲和抗弯曲条件下分别进行 2000 次循环 6000 次充放电循环后，该器件保留了 89.7% 的初始电容，表现出令人惊叹的循环稳定性。最后，两个器件串联可以在充电2.5分钟后点亮1.8 V的LED 2分钟，这对自支撑非对称超级电容器的实际应用和生产具有启发意义。