The development of sodium-ion batteries with high power density is highly challenging yet critically important in many applications. Herein, we develop sodium-ion batteries with ultrahigh power density by using N-doped hard/soft double-carbon-coated Na₃V₂(PO₄)₃ hybrid-porous microspheres as a cathode. A higher working potential of 3.4 V, superior rate capability (93 mA h g⁻¹ at 10C, 81 mA h g⁻¹ at 30C) as well as stable cycling performance (72.9% capacity retention at 10C after 1000 cycle) are simultaneously achieved. Very impressively, it can deliver pseudocapacitive behavior and a practical energy density of 317 W h kg⁻¹ at a power density of 194 W kg⁻¹, which also remains 73.5 W h kg⁻¹ even at an ultrahigh power density of 12600 W kg⁻¹. The superior performances can be ascribed to the hybrid-porous microsphere structure, which provide favorable kinetics for bath electron and Na⁺, large cathode-electrolyte contact area, as well as robust structural integrity. This design provides a promising pathway for developing low-cost sodium-ion batteries with high energy density as well as high power density.

具有高功率密度的钠离子电池的开发极具挑战性，但在许多应用中至关重要。本文中，我们通过使用N掺杂的硬/软双碳涂层Na ₃ V ₂（PO ₄）₃混合多孔微球作为阴极，开发具有超高功率密度的钠离子电池。同时实现了3.4 V的更高工作电势，优异的倍率能力（在10C下为93 mA h g ^-1，在30C下为81 mA h g ^-1）以及稳定的循环性能（1000个循环后在10C下的容量保持率为72.9％）。令人印象深刻的是，它可以在功率密度为194 W kg时提供伪电容行为和317 W h kg ^-1的实际能量密度^-1，这也保持73.5 W时千克^-1甚至为W公斤12600的超高功率密度^-1。优异的性能归因于杂化多孔微球结构，该结构为浴电子和Na ⁺提供了良好的动力学特性，具有大的阴极-电解质接触面积，并且结构坚固。该设计为开发具有高能量密度和高功率密度的低成本钠离子电池提供了有希望的途径。