层状六边形Co1-xS修饰氮掺杂碳纳米管用于锂硫电池的硫载体

通过纳米结构材料的设计和组装来改善锂硫电池的电化学性能。在本工作中，成功合成了六边形Co_1-xS纳米片修饰的氮掺杂碳纳米管（Co_1-xS-CNT）复合材料，并将其用作锂硫电池（LSBs）的硫正极载体。在Co_1-xS-CNT/S中，极性六方Co_1-xS纳米片可以化学吸附多硫化锂，同时CNT可以为电极材料提供高导电网络。基于物理限域和化学吸附的协同作用，Co_1-xS-CNT/S正极表现出优异的电化学循环性能。在0.5C倍率下循环170次，电极仍可保持405.6 mAh·g^-1的放电比容量，同时具有超过99.2%的稳定库仑效率。

Layered Hexagonal Co1-xS Decorating N-Doped Carbon Nanotubes as a Sulfur Host for Li-S Batteries

The design and assembly of nanostructured materials are devoted to improving the electrochemical properties of the Li-S batteries (LSBs) by synergistic effect. In this work, a composite of hexagonal Co_1-xS nanosheets decorating N-doped carbon nanotube (Co_1-xS-CNT) was successfully synthesized and used as a sulfur host for Li-S batteries (LSBs). In Co_1-xS-CNT/S, the polar hexagonal Co_1-xS nanosheets can absorb the lithium polysulfide through chemisorption, at the same time, the CNT can provide a highly conductive network. Based on the synergy of physical encapsulating and chemical trapping, the Co_1-xS-CNT/S cathode exhibited excellent electrochemical performance, especially the superior cycle performance. After 170 cycles, the Co_1-xS-CNT/S can maintain a discharge capacity of 405.6 mAh·g^-1 at 0.5C, with a stable Coulombic efficiency (over 99.2%).