Yang Zhe, Han Yicheng, Chen Kai, Zhang Guodong, Xing Shuangxi
Faculty of Chemistry, Northeast Normal University, Changchun 130024, China.
Fujian Provincial Key Laboratory for Soft Functional Materials, Department of Physics, Research Institute for Biomimetics and Soft Matter, Xiamen University, Xiamen 361005, China.
Materials (Basel). 2025 Mar 4;18(5):1141. doi: 10.3390/ma18051141.
In this paper, the natural waste pinecone as a carbon precursor for the generation of satisfactory sulfur host materials in lithium-sulfur batteries was realized by introducing molybdenum carbide nanoparticles into the derived carbon structure. The conductive pinecone-derived carbon doped with N, O reveals an expansive specific surface area, facilitating the accommodation of a higher sulfur load. Moreover, the integration of MoC nanoparticles also significantly enhances its chemical affinity and catalytic capacity for polysulfides (LiPSs) to alleviate the shuttle effect and accelerate sulfur redox conversion. As a result, the WPC-MoC/S electrode displays excellent electrochemical performance, including a low capacity decay rate of 0.074% per cycle during 600 cycles at 1 C and an outstanding rate capacity (631.2 mAh g at 3 C). Moreover, with a high sulfur loading of 5.5 mg cm, the WPC-MoC/S electrode shows a high area capacity of 5.1 mAh cm after 60 cycles at 0.2 C.
在本文中，通过将碳化钼纳米颗粒引入衍生碳结构，实现了以天然废弃松果作为碳前驱体来制备锂硫电池中令人满意的硫主体材料。掺杂N、O的具有导电性的松果衍生碳展现出较大的比表面积，有利于容纳更高的硫负载量。此外，MoC纳米颗粒的引入还显著增强了其对多硫化物（LiPSs）的化学亲和力和催化能力，以减轻穿梭效应并加速硫的氧化还原转化。结果，WPC-MoC/S电极表现出优异的电化学性能，包括在1 C下600次循环期间每循环0.074%的低容量衰减率以及出色的倍率性能（在3 C下为631.2 mAh g）。此外，在硫负载量为5.5 mg cm时，WPC-MoC/S电极在0.2 C下循环60次后显示出5.1 mAh cm的高面积容量。
