Lithium–oxygen (or Li–air) cells have attracted increasing interest in recent years due to their extremely high theoretical energy density. A reasonable design of the catalytic cathode is essential to realize a high performance of Li–O₂ cells. In this work, a unique core–shell MnO₂@NiCo₂O₄ array cathode with a porous structure has been deposited directly on carbon cloth by a facile hydrothermal route. The array structure facilitates electrode wetting and oxygen gas transportation. The porous structure supplies free space for Li₂O₂ loading. The MnO₂@NiCo₂O₄ array cathode exhibits a high catalytic effect enabling the conformal growth of Li₂O₂ with the array structure retained. This growth behavior of Li₂O₂ makes the decomposition of Li₂O₂ easy upon charging. Li–O₂ cells with the MnO₂@NiCo₂O₄ cathode can sustain a stable cycling of 168 cycles with a limited capacity of 500 mA h g⁻¹ at 400 mA g⁻¹, which is superior to those with the NiCo₂O₄ cathode.

中文翻译：

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NiCo ₂ O ₄ / MnO ₂核/壳阵列作为高性能锂氧电池的无粘结剂催化阴极†

锂-氧（或锂-空气）电池由于其极高的理论能量密度，近年来引起了越来越多的兴趣。合理设计催化阴极对于实现Li–O ₂电池的高性能至关重要。在这项工作中，一个独特的具有多孔结构的核-壳MnO ₂ @NiCo ₂ O ₄阵列阴极已经通过一种便捷的水热途径直接沉积在碳布上。阵列结构有利于电极润湿和氧气的输送。多孔结构为Li ₂ O _2的装载提供了自由空间。MnO ₂ @NiCo ₂ O ₄阵列阴极表现出高的催化作用，使得能够在保留阵列结构的情况下使Li ₂ O ₂保形生长。Li ₂ O _2的这种生长行为使得Li ₂ O ₂在充电时易于分解。李-O _2个细胞用的MnO ₂ @NiCo ₂ ö ₄阴极可以承受168次循环稳定的循环与500毫安Hg的容量有限^-1以400mA克^-1，这是优于与镍钴₂ ö _4个阴极。