Due to the abundant manganese reserves and the ability to provide higher voltages, the Mn³⁺ and Mn⁴⁺ cathode materials have been widely studied in zinc-ion batteries (ZIBs). However, there are some common disadvantages including poor conductivity and the expansion in volume during cycling, which exist in these Mn³⁺ and Mn⁴⁺ materials. Herein, we applied pure MnO as an electrode material to ZIBs and discussed the reaction mechanism. Specifically, the energy density could reach 431.5 mAh g⁻¹ at 0.2 A g⁻¹, which was the highest in the Mn-based materials. It also showed high capacity (187.8 mAh g⁻¹) after 500 cycles at 1A g⁻¹. And after 1200 cycles at 1.5 A g⁻¹, the capacity retention rate was still at 87.3%, suggesting the great long-life cycling. This kind of MnO encapsulated by carbon can bring new opportunities for Mn-based ZIBs.

由于锰储量丰富且能够提供更高的电压，因此在锌离子电池（ZIBs）中已广泛研究了Mn ³⁺和Mn ⁴⁺正极材料。然而，在这些Mn ³⁺和Mn ⁴⁺材料中存在一些常见的缺点，包括导电性差和循环过程中的体积膨胀。在本文中，我们将纯MnO作为电极材料应用于ZIBs，并讨论了其反应机理。具体地，在0.2A g ^-1下能量密度可以达到431.5mAh g ^-1，这在Mn基材料中是最高的。在1A g ^-1下500次循环后，它还显示出高容量（187.8 mAh g ^-1）。并且在1.5A g ^-1下1200次循环之后，容量保持率仍为87.3％，表明长寿命循环。碳包裹的这种MnO可以为Mn基ZIBs带来新的机会。