Micro- and mesoporous graphitic carbon sheets (MGC) were synthesized from jute sticks (bio-waste) and employed as an efficient polysulfide inhibitor for sulfur cathode in a lithium–sulfur battery application. The as-prepared MGC possesses sheet-like morphological characteristics with unique textural properties such as high specific surface area (2047 m2 g−1), large pore volume (1.69 cc3 g−1) and has excellent graphitic carbon structures. Studies were made in order to optimize the sulfur loading into MGC and to modify the polypropylene separator by coating with a thin layer of as-prepared MGC to attain enhanced electrochemical performance. The optimized sulfur loaded MGC/S-2 cathode with modified separator delivered a high initial discharge capacity of 1542 mAh g−1 and retained a discharge capacity of 1016 mAh g−1 after 50 cycles at 0.2 C rate, attributed to high surface area and porosity of MGC, which act as host as well as barrier film that inhibits the migration of dissolved polysulfide species to the anode during the redox process. Furthermore, the novel cell configuration with modified separator renders high sulfur loading up to 9.3 mg cm−2 and the resulting cell delivered a high discharge capacity of 632 mAh g−1 at 0.2 C rate even at 50th cycle.

中文翻译：

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具有高硫载量和多硫化物双重限制的多孔石墨碳片可提高锂硫电池的性能

微孔和介孔石墨碳片（MGC）由黄麻棒（生物废物）合成，并用作锂硫电池应用中硫阴极的有效多硫化物抑制剂。所制备的 MGC 具有片状形态特征和独特的结构特性，如高比表面积 (2047 m2 g-1)、大孔体积 (1.69 cc3 g-1) 并具有优异的石墨碳结构。进行了研究，以优化 MGC 中的硫负载量，并通过涂覆一薄层制备的 MGC 来改进聚丙烯隔膜，以获得增强的电化学性能。优化的含硫 MGC/S-2 正极和改良的隔膜提供了 1542 mAh g-1 的高初始放电容量，并在 0.2 C 倍率下循环 50 次后仍保持 1016 mAh g-1 的放电容量，这归因于 MGC 的高表面积和孔隙率，它作为主体和屏障膜，在氧化还原过程中抑制溶解的多硫化物物质迁移到阳极。此外，具有改良隔板的新型电池配置使硫负载高达 9.3 mg cm-2，并且所得电池在 0.2 C 倍率下即使在第 50 次循环时也能提供 632 mAh g-1 的高放电容量。