High volumetric capacitance electrode materials are highly desirable for miniaturized and portable capacitive storage devices. Herein, a spatially confined strategy to prepare 0D-in-2D pillared lamellar hybrid comprising vanadium nitride nanodots intercalated carbon nanosheets (VNNDs/CNSs) is proposed for promising capacitive material with high volumetric capacitance. The VNNDs/CNSs shows an ultrahigh volumetric capacitance of 1203.6 F cm⁻³ at 1.1 A cm⁻³ and rate capability of 703.1 F cm⁻³ at 210 A cm⁻³ surpassing those of carbon, transition metal oxides/nitrides. Even the 150 μm-thick film electrode comprising VNNDs/CNSs has a volumetric capacitance of 867.1 F cm⁻³. Moreover, the VNNDs/CNSs electrode exhibits extraordinary cycling stability with 90% capacitance retention after 10,000 cycles. The all-solid-state symmetric flexible supercapacitor based on VNNDs/CNSs electrodes boasts a high volumetric energy density/power density of 30.9 Wh L⁻¹/64,500 W L⁻¹ with 91% capacitance retention after 10000 cycles, rendering promising applications in high-performance flexible supercapacitors. The strategy provides an insight into the rational design of compact, robust and highly conductive electrode materials with high volumetric capacitances and long life.

高体积电容电极材料对于小型化和便携式电容存储设备是非常需要的。在此，提出了一种空间受限的策略来制备包含氮化钒纳米点插入碳纳米片（VNNDs / CNSs）的0D-in-2D柱状层状杂化体，以用于具有高体积电容的有希望的电容材料。所述VNNDs / CNSS示出了超高体积电容的1203.6˚F厘米^-3，在1.1厘米^-3的703.1˚F厘米和速率能力^-3在210甲厘米^-3超过那些碳，过渡金属氧化物/氮化物。甚至包括VNNDs / CNSs的150μm厚膜电极的体积电容为867.1 F cm ^-3。此外，VNNDs / CNSs电极表现出非凡的循环稳定性，在10,000次循环后具有90％的电容保持率。基于VNNDs / CNSs电极的全固态对称柔性超级电容器具有30.9 Wh L ^-1 / 64,500 W L ^-1的高体积能量密度/功率密度，在10000次循环后具有91％的电容保持率，在高功率下具有广阔的应用前景性能灵活的超级电容器。该策略提供了对具有高体积电容和长寿命的紧凑，坚固，高导电性电极材料的合理设计的见解。