Ultrathin carbon sheets with high surface area, abundant mesoporous structure and rich N, O heteroatom doping sites were prepared from puffed rice through unique sealed pre-carbonization. By utilizing them as cathode materials for lithium-sulfur batteries, the in-operando Raman spectra and electrochemical tests indicated that the polysulfides shuttling effect could be substantially suppressed by the physical confinement and chemical adsorption due to these structural advantages. In addition, the well-developed hierarchical porous structure and ultrathin thickness were found to enhance the mass diffusion in the electrode, which increased the ion conductivity within the carbon framework. Therefore, the as-designed cathode was observed to accommodate the high sulfur loading amounts and demonstrated a high reversible capacity of 920.8 mAh g⁻¹ after 100 cycles at 0.2C with high coulombic efficiency (~100%). Moreover, the long-term stability test at 1C indicated that the cathode achieved a high reversible capacity of 702.1 mAh g⁻¹ after 300 cycles with low decay rate of 0.07% per cycle.

采用独特的密封预碳化法，由膨化大米制备了具有高表面积，丰富的介孔结构和丰富的N，O杂原子掺杂位点的超薄碳片。通过将它们用作锂硫电池的正极材料，操作中拉曼光谱和电化学测试表明，由于这些结构优势，物理限制和化学吸附可大大抑制多硫化物的穿梭效应。此外，发现发达的分层多孔结构和超薄厚度可增强电极中的质量扩散，从而增加碳骨架内的离子电导率。因此，观察到如此设计的阴极可容纳高硫负载量，并显示出920.8 mAh g的高可逆容量。^-1在0.2C下循环100次后具有高库仑效率（〜100％）。此外，在1℃下的长期稳定性测试表明，在300次循环之后，阴极实现了702.1mAh g ^-1的高可逆容量，每循环0.07％的低衰减率。