目前，能量密度高且生态友好、原料易得的锂硫电池是极具发展潜能的储能体系之一，其理论能量密度可以达到2600Wh·kg-1，但锂硫电池依旧存在正极活性物质硫的导电性差、利用率低、放电过程中存在体积膨胀现象和“穿梭效应”的缺点，这些问题降低了锂硫电池的实际容量和循环性能。为了改善这些问题对电池性能的影响，本文设计制备了层状氢氧化钇（LYH）纳米材料，并将其与碳纳米管（CNT）复合制备LYH@CNT复合材料用作硫的载体。之后采用熔融浸渍法在LYH和LYH@CNT材料上负载硫，测试并比较两种材料（LYH@S和LYH@CNT@S）作为锂硫电池正极材料的电化学性能。结果表明LYH@CNT@S作电池正极时，电池表现出更优良的循环性能，在0.2 C的电流密度下循环100次后放电容量仍保持在600 mAh·g-1，同时，其极化程度较小，还表现出良好的倍率性能。LYH@CNT复合材料导电性好、比表面积大，增大了与单质硫的接触面积，其特殊的结构可缓解硫体积膨胀带来的影响。同时，LYH层状材料可以通过静电作用吸附多硫化锂，抑制其穿梭效应。因此，LYH@CNT@S复合材料作为锂硫电池正极材料可提升电池的电化学性能。

At present, lithium-sulfur batteries with high energy density, eco-friendly, and readily available raw materials are one of the energy storage systems with great potential for development, and their theoretical energy density can reach 2600 Wh·kg-1. However, lithium-sulfur batteries still have the disadvantages of poor conductivity, low utilization rate, volume expansion and “shuttle effect” during discharge, which reduce the actual capacity and cycle performance of lithium-sulfur batteries. In order to improve the impact of these problems on battery performance, layered yttrium hydroxide (LYH) nanomaterials were designed and prepared in this paper, and composited with carbon nanotubes (CNTs) to prepare LYH@CNT composites as sulfur carriers. Then, sulfur was loaded on LYH and LYH@CNT materials by melt impregnation method, and the electrochemical performance of the two materials (LYH@S and LYH@CNT@S) as cathode materials for lithium-sulfur batteries was tested and compared. The results show that when LYH@CNT@S is used as the positive electrode of the battery, the battery exhibits better cycle performance, and the discharge capacity remains at 600 mAh·g-1 after 100 cycles at a current density of 0.2 C. At the same time, its polarization degree smaller and also exhibits good rate performance. The LYH@CNT composite has good electrical conductivity and large specific surface area, which increases the contact area with elemental sulfur, and its special structure can alleviate the influence of sulfur volume expansion. At the same time, the LYH layered materials can adsorb lithium polysulfides through electrostatic interaction and inhibit its shuttle effect. Therefore, LYH@CNT@S composites can improve the electrochemical performance of lithium-sulfur batteries as cathode materials.