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首页> 美国卫生研究院文献>Materials >Investigation on Fabrication of Reduced Graphene Oxide-Sulfur Composite Cathodes for Li-S Battery via Hydrothermal and Thermal Reduction Methods
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Investigation on Fabrication of Reduced Graphene Oxide-Sulfur Composite Cathodes for Li-S Battery via Hydrothermal and Thermal Reduction Methods

机译：通过水热还原方法对Li-S电池减少石墨烯氧化硫复合阴极制备的研究

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Lithium-sulfur (Li-S) battery is considered one of the possible alternatives for next-generation high energy batteries. However, its practical applications are still facing great challenges because of poor electronic conductivity, large volume change, and polysulfides dissolution inducing “shuttle reaction” for the S cathode. Many strategies have been explored to alleviate the aforementioned concerns. The most common approach is to embed S into carbonaceous matrix for constructing C-S composite cathodes. Herein, we fabricate the C-S cathode reduced graphene oxide-S (rGO-S) composites via one step hydrothermal and in-situ thermal reduction methods. The structural features and electrochemical properties in Li-S cells of the two type rGO-S composites are studied systematically. The rGO-S composites prepared by one step hydrothermal method (rGO-S-HT) show relatively better comprehensive performance as compared with the ones by in-situ thermal reduction method (rGO-S-T). For instance, with a current density of 100 mA g−1, the rGO-S-HT composite cathodes possess an initial capacity of 1290 mAh g−1 and simultaneously exhibit stable cycling capability. In particular, as increasing the current density to 1.0 A g−1, the rGO-S-HT cathode retains a reversible capacity of 582 mAh g−1 even after 200 cycles. The enhanced electrochemical properties can be attributed to small S particles uniformly distributed on rGO sheets enabling to significantly improve the conductivity of S and effectively buffer large volume change during lithiation/delithiation.
机译：锂 - 硫（LI-S）电池被认为是下一代高能量电池的可能替代方案之一。然而，由于电子导电性差，大体积变化和聚硫化物溶解为S阴极诱导“梭式梭式”，其实际应用仍面临巨大挑战。探讨了许多策略来缓解上述问题。最常见的方法是将S嵌入碳质基质中以构建C-S复合阴极。在此，我们通过一步水热和原位的热还原方法制造C-S阴极还原的氧化烯氧化物-S（RGO-S）复合材料。系统地研究了两种RGO-S复合材料的Li-S细胞中的结构特征和电化学性质。通过一步水热量（RGO-S-HT）制备的RGO-S复合材料与原位的热还原方法（RGO-S-T）相比，与那些相比，综合性能相对更好。例如，具有100mA G-1的电流密度，RGO-S-HT复合阴极具有1290mAhg-1的初始容量，同时表现出稳定的循环能力。特别地，随着电流密度的增加至1.0Ag-1，即使在200次循环之后，RGO-S-HT阴极也保持可逆容量为582mAhg-1。增强的电化学性质可归因于均匀地分布在RGO片上的小S颗粒，其能够显着提高S的锂化/脱水剂在锂化/脱水过程中的S和有效缓冲液的电导率。

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