Restraining the shuttle effect and improving the cycling durability of lithium-sulfur (Li-S) batteries are the basic premise to realize its large-scale application, while the adsorption and catalytic capacities of the host to polysulfide lithium (Li₂S_n, 4 ≤ n ≤ 8) is the key to affect those performances. Therefore, in this work, yolk-shell porous carbon spheres loaded with CoSe₂ nanosheets (THC-CoSe₂) are synthesized as hosts for Li-S batteries. Due to the unique microstructure, as-constructed S@THC-CoSe₂ cathode not only can relieve the volume expansion of active substance, but also offer a “multilayer defensive system” to prevent the outward diffusion of Li₂S_n through physical and chemical interactions simultaneously. In addition, the outermost CoSe₂ nanosheets with excellent electronic conductivity is able to catalyze the transformation of Li₂S_n anchored on its surface, finally accelerating the elimination of soluble intermediates and weakening the shuttle phenomenon. Based on above advantages, the initial discharge capacity of the Li-S battery assembled by S@THC-CoSe₂ cathode is as high as 1230.0 mAh g⁻¹ at the current rate of 0.1C, and the capacity attenuation of each cycle is as low as 0.034% in 1000cycles at 1.0C.

限制穿梭效应并提高锂硫（Li-S）电池的循环寿命是实现其大规模应用的基本前提，同时主体对多硫化锂（Li ₂ S _n，4 ≤n≤8）是影响这些性能的关键。因此，在这项工作中，负载有CoSe ₂纳米片（THC-CoSe ₂）的卵黄壳多孔碳球被合成为Li-S电池的主体。由于其独特的微观结构，原样构建的S @ THC-CoSe ₂阴极不仅可以缓解活性物质的体积膨胀，而且还提供了一个“多层防御体系”来防止Li ₂ S _n向外扩散。同时通过物理和化学相互作用。另外，具有优异电导率的最外层的CoSe ₂纳米片能够催化锚定在其表面上的Li ₂ S _n的转变，最终加速消除可溶性中间产物并减弱穿梭现象。基于上述优点，由S @ THC-CoSe ₂阴极组装的Li-S电池在0.1C的电流速率下的初始放电容量高达1230.0 mAh g ^-1，每个循环的容量衰减为在1.0C的1000个循环中低至0.034％。