Peng Lin, Zhang Mingkun, Zheng Liyuan, Yuan Qichong, Yu Zhanjiang, Shen Junhao, Chang Yu, Wang Yi, Li Aiju
School of Chemistry, South China Normal University, Guangzhou, 510006, China.
School of Environment, South China Normal University, Guangzhou, 510006, China.
Small Methods. 2022 Aug;6(8):e2200332. doi: 10.1002/smtd.202200332. Epub 2022 Jun 10.
Although the high-energy-density lithium sulfur (Li-S) battery has been considered one of the most promising next-generation energy storage technology, the practical applications have been plagued by the sluggish reaction kinetics and the shuttle effect of lithium polysulfides intermediates. Here, to address the above issues, the authors report a novel separator modified by CeO -decorated porous carbon nanostructure (CeO /KB/PP). Benefiting from the strong polar surface and large specific surface area, (CeO -doped Ketjen Black) delivers efficient chemical adsorption toward lithium polysulfides. Moreover, rich oxygen vacancies of CeO provide abundant active sites to expedite lithium polysulfides conversion and regulate deposition and nucleation of Li S. Taking advantage of these merits, the battery with the CeO /KB/PP separator exhibits remarkable electrochemical performance, including low-capacity decay of only 0.06% per cycle over 1000 cycles at 2 C and superior rate capability of 627 mAh g at 3 C. Even with a high sulfur loading of 6.6 mg cm , the battery can achieve a high areal capacity of 3.6 mAh cm after 100 cycles. This work provides a new application of rare-earth-based materials to facilitate Li-S batteries.
尽管高能量密度锂硫（Li-S）电池被认为是最有前景的下一代储能技术之一，但其实际应用一直受到反应动力学缓慢和多硫化锂中间体穿梭效应的困扰。在此，为了解决上述问题，作者报道了一种由CeO修饰的多孔碳纳米结构（CeO /KB/PP）改性的新型隔膜。得益于强极性表面和大比表面积，（CeO掺杂的科琴黑）对多硫化锂具有高效的化学吸附作用。此外，CeO丰富的氧空位提供了大量活性位点，以加速多硫化锂的转化，并调节Li S的沉积和成核。利用这些优点，采用CeO /KB/PP隔膜的电池表现出卓越的电化学性能，包括在2 C下1000次循环中每循环仅0.06%的低容量衰减以及在3 C下627 mAh g的优异倍率性能。即使在硫负载量高达6.6 mg cm 的情况下，电池在100次循环后仍可实现3.6 mAh cm 的高面积容量。这项工作为稀土基材料在促进锂硫电池方面提供了新的应用。
