Rechargeable Li-O₂ batteries (LOBs) have been receiving intensive attention because of their ultra-high theoretical energy density close to the gasoline. Herein, Ag modified urchin-like α-MnO₂ (Ag-MnO₂) material with hierarchical porous structure is obtained by a facile one-step hydrothermal method. Ag-MnO₂ possesses thick nanowires and presents hierarchical porous structure of mesopores and macropores. The unique structure can expose more active sites, and provide continuous pathways for O₂ and discharge products as well. The doping of Ag leads to the change of electronic distribution in a-MnO₂ (i.e., more oxygen vacancies), which play important roles in improving their intrinsic catalytic activity and conductivity. As a result, LOBs with Ag-MnO₂ catalysts exhibit lower overpotential, higher discharge specific capacity and much better cycle stability compared to pure α-MnO₂. LOBs with Ag-MnO₂ catalysts exhibit a superior discharge specific capacity of 13,131 mAhg⁻¹ at a current density of 200 mAg⁻¹, a good cycle stability of 500 cycles at the capacity of 500 mAhg⁻¹. When current density is increased to 400 mAg⁻¹, LOBs still retain a long lifespan of 170 cycles at a limited capacity of 1,000 mAhg⁻¹.

可充电Li-O ₂电池（LOB）由于其接近汽油的超高理论能量密度而受到广泛关注。在本文中，银改性海胆状α-MnO的₂（银的MnO ₂）具有分级的多孔结构材料由一个浅显一步法水热法获得的。Ag-MnO ₂具有较粗的纳米线，并呈现出中孔和大孔的分层多孔结构。独特的结构可以暴露更多的活性位点，并为O ₂和放电产物提供连续的途径。Ag的掺杂导致a-MnO ₂中电子分布的变化（即更多的氧空位），它们在改善其固有的催化活性和电导率方面起着重要作用。其结果是，利用Ag-MnO的LOB的_2层的催化剂相比于纯α-MnO的表现出较低的超电势，更高的放电比容量和更好的循环稳定性₂。带有Ag-MnO ₂催化剂的LOB在200 mAg ^-1的电流密度下显示出13,131 mAhg ^-1的优异放电比容量，在500 mAhg ^-1的容量下具有500个循环的良好循环稳定性。当电流密度增加到400 mAg ^-1时，LOB在1,000 mAhg ^-1的有限容量下仍保持170个循环的长寿命。