【摘要】 锂硫电池因具有高理论容量和高能量密度被认为是最具前景的储能技术之一。然而，锂硫电池因硫电导率低、多硫化物穿梭效应、电极体积膨胀等问题限制了其实际应用。为了探究ReS₂纳米片对锂硫电池性能的影响，采用简单的水热法实现ReS₂纳米片在碳纤维布（CFC）上均匀生长，形成ReS₂-CFC复合材料；并通过熔融扩散法，将活性物质硫分散在ReS₂-CFC中作为锂硫电池正极（S/ReS₂-CFC）。借助扫描电子显微镜（SEM）、X射线衍射仪（XRD）和电化学技术等表征测试手段分析了S/ReS₂-CFC的形貌和电化学性能。结果表明，CFC和ReS₂通过物理和化学协同作用能够很好地抑制多硫化物的穿梭，提高电池倍率性能和循环稳定性。S/ReS₂-CFC正极电池在0.2C(1C=1675 mAh·g^-1)倍率下有1522 mAh·g^-1的高放电比容量；在4C倍率下放电比容量能够达到768 mAh·g^-1,经过500圈循环后保持在548 mAh·g^-1,每圈衰减率为0.058%。更多还原

【Abstract】 Lithium-sulfur battery is considered as one of the most promising energy storage technologies due to its high theoretical capacity and high energy density. However, the problems such as low conductivity of sulfur, polysulfide shuttling effect and electrode volume expansion limit the practical application of lithium-sulfur battery. In order to investigate the effect of ReS₂ nanosheets on the performance of lithium-sulfur battery, ReS₂ nanosheets were uniformly grown on carbon fiber cloth（CFC） via a simple hydrothermal method（S/ReS₂-CFC）. And the active substance sulfur was dispersed in ReS₂-CFC as the cathode of lithium-sulfur battery by melt diffusion method（S/ReS₂-CFC）. The morphology and electrochemical properties of the S/ReS₂-CFC were analyzed by scanning electron microscopy（SEM）, X-ray diffractometer（XRD） and electrochemical techniques. The results indicate that CFC and ReS₂ can be inhibited through physical and chemical synergy of CFC and ReS₂, and the lithium-sulfur battery rate performance and cycle stability can be improved. The S/ReS₂-CFC cathode cell has a high discharge specific capacity of 1522 mAh·g^-1 at 0.2 C(1 C=1675 mAh·g^-1), and the discharge specific capacity of 768 mAh·g^-1 at 4 C. It can maintain at 548 mAh·g^-1 after 500 cycles at 4 C, and the attenuation rate per cycle is 0.058%.更多还原