Mn-based cathodes are promising candidates for aqueous zinc-ion batteries (ZIBs) owing to the merits of low toxicity, high energy density, and safety. However, due to the strong electrostatic resistance of Zn²⁺, ZIBs usually suffer from huge mechanical stress during cycling and result in serious volume fluctuation and structural instability. Correspondingly, it is still significant to explore an effective stress-release strategy for achieving a long-time cycle lifespan with high available capacity. Herein, we report an urchin-like hierarchical porous Mn₂O₃ yolk-shell microspheres (HP–Mn₂O₃-YSMSs). As a proof of concept, the designed hierarchical porous yolk-shell architecture effectively releases the internal stresses from both radial and tangential directions via the internal void space and porous shell. Specifically, the HP-Mn₂O₃-YSMSs manifest high reversible capacity (311 mAh/g at 0.1 A/g) and long cycle life (81.3% retention at 2.0 A/g after 4000 cycles). This effective stress-release design opens a new direction for the development of the structural stable electrodes for practical energy applications.

由于低毒性、高能量密度和安全性等优点，锰基正极是水性锌离子电池（ZIBs）的有希望的候选材料。然而，由于Zn ²⁺的强静电电阻，ZIBs在循环过程中通常会受到巨大的机械应力，导致严重的体积波动和结构不稳定。相应地，探索一种有效的应力释放策略以实现长周期寿命和高可用容量仍然具有重要意义。在此，我们报道了一种类似海胆的分级多孔 Mn ₂ O ₃蛋黄壳微球（HP-Mn ₂ O ₃-YSMS)。作为概念证明，设计的分层多孔蛋黄-壳结构通过内部空隙空间和多孔壳有效地释放径向和切向方向的内应力。具体而言，HP-Mn ₂ O ₃ -YSMS 表现出高可逆容量（0.1 A/g 时为 311 mAh/g）和长循环寿命（4000 次循环后 2.0 A/g 时保留率为 81.3%）。这种有效的应力释放设计为用于实际能源应用的结构稳定电极的开发开辟了新方向。