MnO Nanocubes Enabling Charging Potential of Li-O₂ Batteries to 3.25 V in a LiMnO₄-dominated Novel Reaction Mechanism

【摘要】 We proposed a strategy to address the issue by synthesizing MnO with half-filled 3 d electron orbitals.That is,MnO nanocubes with an edge length of 61.82 nm were successfully prepared through electros-pinning and one-step pyrolysis as the cathode electrode for Li-O₂ batteries.It is observed that the intermediate LiMnO₄ rather than Li₂O₂ is formed when LiO₂ interactes with MnO （111） during the discharge process.It is precisely because of LiMnO₄ that reduces its charge overpotential to 0.29 V.The novel reaction mechanism dominated by LiMnO₄ further facilitates the lower charge overpotential,thereby enhancing the energy efficiency of the batteries.更多还原

【Abstract】 We proposed a strategy to address the issue by synthesizing MnO with half-filled 3 d electron orbitals.That is,MnO nanocubes with an edge length of 61.82 nm were successfully prepared through electros-pinning and one-step pyrolysis as the cathode electrode for Li-O₂ batteries.It is observed that the intermediate LiMnO₄ rather than Li₂O₂ is formed when LiO₂ interactes with MnO （111） during the discharge process.It is precisely because of LiMnO₄ that reduces its charge overpotential to 0.29 V.The novel reaction mechanism dominated by LiMnO₄ further facilitates the lower charge overpotential,thereby enhancing the energy efficiency of the batteries.更多还原