We demonstrate a rechargeable zinc-ion battery with high energy density and cyclability using MnO₂ and reduced graphene oxide (MnO₂/rGO) electrode. The flexible and binder free electrode, with high MnO₂ mass ratio (80 wt% of MnO₂), is fabricated using vacuum filtration without any additional additives other than rGO. Compared to batteries with conventional MnO₂ electrodes, the Zn–MnO₂/rGO battery shows a significant enhanced capacity (332.2 mAh g^-1 at 0.3 A g^-1), improved rate capability (172.3 mAh g^-1 at 6 A g^-1) and cyclability. The capacity retention remains 96% after 500 charge/discharge cycles at 6 A g^-1. The high MnO₂ mass ratio makes MnO₂/rGO electrode advantageous when the capacity is normalized to the whole electrode, particularly at high rates. The calculated gravimetric energy density of Zn–MnO₂/rGO battery is 33.17 W h kg^-1, which is comparable to the existing commercial lead-acid batteries (30–40 W h kg^-1). Furthermore, the discharge profile and capacity of our Zn–MnO₂/rGO battery shows no deterioration during bending test, indicating good flexibility. As a result, zinc-ion battery is believed to be a promising technology for powering next generation flexible electronics.

我们展示了使用MnO ₂和还原氧化石墨烯（MnO ₂ / rGO）电极的高能量密度和可循环性的可再充电锌离子电池。柔性和粘结剂没有电极，具有高的MnO ₂质量比（MnO的80重量％₂）中，使用真空过滤而不比RGO其它任何另外的添加剂制造。相比于常规的MnO电池_2个电极，所述Zn类的MnO ₂ / RGO电池示出了显著增强容量（毫安332.2克^-1 0.3 A G ^-1），改进的速率能力（172.3毫安克^-1在6所述的克^{- 1个}）和可循环性。在6 A g ^-1下进行500次充电/放电后，容量保持率保持96％。当将容量归一化到整个电极时，特别是在高速率下，高的MnO ₂质量比使得MnO ₂ / rGO电极具有优势。Zn-MnO ₂ / rGO电池的重量能量密度计算结果为33.17 W h kg ^-1，与现有的商用铅酸电池（30-40 W h kg ^-1）相当。此外，我们的Zn-MnO ₂的放电曲线和容量/ rGO电池在弯曲测试期间未显示劣化，表明具有良好的柔韧性。结果，锌离子电池被认为是为下一代柔性电子设备供电的有前途的技术。