Wu Zhen, He Wenfeng, Xie Renjie, Xiong Xuan, Wang Zihan, Zhou Lei, Qiao Fen, Wang Junfeng, Zhou Yan, Wang Xinlei, Yuan Jiajia, Tang Tian, Hu Chenyao, Tong Wei, Ni Lubin, Wang Xin, Fu Yongsheng
School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China.
Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, China.
Molecules. 2024 Oct 21;29(20):4968. doi: 10.3390/molecules29204968.
Lithium-sulfur (Li-S) batteries offer a high theoretical energy density but suffer from poor cycling stability and polysulfide shuttling, which limits their practical application. To address these challenges, we developed a PANI-modified MoS-NG composite, where MoS nanoflowers were uniformly grown on graphene oxide (GO) through PANI modification, resulting in an increased interlayer spacing of MoS. This expanded spacing exposed more active sites, enhancing polysulfide adsorption and catalytic conversion. The composite was used to prepare MoS-NG/PP separators for Li-S batteries, which achieved a high specific capacity of 714 mAh g at a 3 C rate and maintained a low capacity decay rate of 0.085% per cycle after 500 cycles at 0.5 C. The larger MoS interlayer spacing was key to improving redox reaction kinetics and suppressing the shuttle effect, making the MoS-NG composite a promising material for enhancing the performance and stability of Li-S batteries.
锂硫（Li-S）电池具有较高的理论能量密度，但存在循环稳定性差和多硫化物穿梭的问题，这限制了它们的实际应用。为应对这些挑战，我们开发了一种聚苯胺修饰的MoS-NG复合材料，其中通过聚苯胺修饰使MoS纳米花均匀生长在氧化石墨烯（GO）上，导致MoS的层间距增加。这种扩大的间距暴露出更多活性位点，增强了多硫化物的吸附和催化转化。该复合材料用于制备锂硫电池的MoS-NG/PP隔膜，在3 C倍率下实现了714 mAh g的高比容量，在0.5 C下循环500次后，容量衰减率保持在每循环0.085%的低水平。较大的MoS层间距是改善氧化还原反应动力学和抑制穿梭效应的关键，使MoS-NG复合材料成为提高锂硫电池性能和稳定性的有前途的材料。
