• Aqueous zinc-manganese batteries with reversible Mn²⁺/Mn⁴⁺ double redox are achieved by carbon-coated MnO_x nanoparticles.

• Combined with Mn²⁺-containing electrolyte, the MnO_x cathode achieves an ultrahigh energy density with a peak of 845.1 Wh kg⁻¹ and an ultralong lifespan of 1500 cycles.

• The electrode behaviors and reaction mechanism are systematically discussed by combining electrochemical measurements and material characterization.

中文翻译：

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碳包覆的MnO x纳米粒子实现具有可逆Mn 2+ / Mn 4+双重氧化还原的高性能锌锰水电池

• 通过碳包覆的MnO _x纳米粒子可实现具有可逆Mn ²⁺ / Mn ⁴⁺双重氧化还原的锌锰水电池。

• 结合含Mn ²⁺的电解质，MnO _x阴极可实现超高能量密度，具有845.1 Wh kg ^-1的峰值和1500个循环的超长寿命。

• 结合电化学测量和材料表征系统地讨论了电极的行为和反应机理。