Highly conductive cathode material with enhanced Na+ diffusion kinetics is of great importance in the exploration of sodium ion batteries. In this work, Na0.91MnO2 porous microcube which is coated with highly conductive polypyrrole (PPy) is obtained. The high Na content in the layered sodium manganate oxide brings about wider interlayer distance resulting in high capacity and electrochemical kinetics. The higher sodium content of Na0.91MO2 makes capacity increase up to 50 mAh g-1 compared with Na0.7MnO2.05. Furthermore, the well-designed combination between porous structure and conductive PPy coating exhibits fast ion/electron transfer inside the electrode and high cycling stability. The PPy coated Na0.91MnO2 delivers a high initial capacity of 208 mAh g-1, encouraging capacity retention and rate capability. Based on the porous Na0.91MnO2@PPy cathode, the sodium ion full cells with puffed millet porous carbon anode show remarkably stable cycling and high-rate performances.

中文翻译：

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富含聚吡咯涂层的富钠氧化锰多孔微立方作为钠离子充满电池的优质阴极。

具有增强的Na +扩散动力学的高导电阴极材料在钠离子电池的研究中非常重要。在这项工作中，获得了涂覆有高导电性聚吡咯（PPy）的Na0.91MnO2多孔微立方体。层状锰酸钠中的高Na含量导致更宽的层间距离，从而导致高容量和电化学动力学。与Na0.7MnO2.05相比，Na0.91MO2的较高钠含量使容量增加到50 mAh g-1。此外，在多孔结构和导电PPy涂层之间精心设计的组合显示出电极内部快速的离子/电子转移和高循环稳定性。PPy涂层的Na0.91MnO2提供了208 mAh g-1的高初始容量，从而提高了容量保持率和速率能力。基于多孔Na0。