The mass loading of the active materials in most flexible electrodes is relatively low, which greatly impedes their practical application. Here, we report a facile strategy to achieve high mass loading of Na₃V₂(PO₄)₃@carbon ([email protected]) supported on carbon cloth ([email protected]) by a two-step coating followed by an annealing treatment and the resultant [email protected] membrane can be used as a binder-free cathode for sodium ion batteries (SIBs). The [email protected] is not only uniformly anchored on the surface of carbon fibers of CC, but also filled between carbon fibers of CC in interconnected three-dimensional (3D) macroporous structure. It is because of the full use of the spaces between carbon fibers of CC that we achieve a high [email protected] mass loading. Thus-obtained [email protected] exhibits excellent cyclability (82.0% capacity retention over 2000 cycles at 20 C) and high rate capacity (96.8 mA h g⁻¹ at 100 C and 69.9 mA h g⁻¹ at 200 C) for sodium half cells and meanwhile the high mass loading of [email protected] on CC also endows the cell with fairly high energy and powder densities of 396 W h kg⁻¹ and 97 kW kg⁻¹. Furthermore, it also presents superior cycling stability and rate performance when evaluated as full battery (NaTi₂(PO₄)₃@C as the anode) cathode. This study offers a new strategy for achieving high mass loading of the active materials on flexible supports in flexible energy storage devices.

大多数柔性电极中活性物质的质量负载相对较低，这极大地阻碍了它们的实际应用。在这里，我们报告了一种可行的策略来实现高质量的Na ₃ V ₂（PO ₄）₃负载通过两步涂覆，然后进行退火处理，将@carbon（受[电子邮件保护]）支撑在碳布（[受电子邮件保护]）上，所得的[受电子邮件保护]膜可用作钠离子电池的无粘合剂阴极（SIB）。[受电子邮件保护]不仅均匀地锚定在CC的碳纤维表面上，而且以互连的三维（3D）大孔结构填充在CC的碳纤维之间。因为充分利用了CC碳纤维之间的空间，我们获得了很高的[受电子邮件保护的]质量负载。如此获得的[电子邮件保护的]具有出色的循环能力（在20 C下2000个循环中82.0％的容量保持率）和高倍率容量（100 C下96.8 mA h g ^-1和69.9 mA h g ^-1对于钠半电池，在200°C时），同时CC上受[电子邮件保护]的大量负载也使该电池具有相当高的能量和396 W h kg ^-1和97 kW kg ^-1的粉末密度。此外，当作为全电池（NaTi ₂（PO ₄）₃ @C作为阳极）阴极评估时，它还具有出色的循环稳定性和倍率性能。这项研究提供了一种新的策略，可实现在柔性储能装置中的柔性支撑物上大量填充活性物质。