Li Xialei, Shang Wen, Zhang Shan, Xu Chun, Lian Jiabiao, Li Guochun
Key Laboratory of Fine Chemical Application Technology of Luzhou, Sichuan Vocational College of Chemical Technology, Luzhou 646300, China.
Key Laboratory of High-Tech Research on Power Batteries and Energy Storage of Zhenjiang, Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China.
Nanomaterials (Basel). 2025 Jul 1;15(13):1015. doi: 10.3390/nano15131015.
Lithium-sulfur (Li-S) batteries are hindered by the sluggish electrochemical kinetics and poor reversibility of lithium polysulfides (LiPSs), which limits their practical energy density and cycle life. In order to address this issue, a novel NiN/NbN heterostructure was synthesized via electrospinning and nitridation as a functional coating for polypropylene (PP) separators. Adsorption experiments were conducted in order to ascertain the heterostructure's superior affinity for LiPSs, thereby effectively mitigating their shuttling. Studies of LiS nucleation demonstrated the catalytic role of the substance in accelerating the deposition kinetics of LiS. Consequently, Li-S cells that employed the NiN/NbN-modified separator were found to achieve significantly enhanced electrochemical performance, with the cells delivering an initial discharge capacity of 1294.4 mAh g at 0.2 C. The results demonstrate that, after 150 cycles, the cells retained a discharge capacity of 796.2 mAh g, corresponding to a low capacity decay rate of only 0.25% per cycle. In addition, the rate capability of the cells was found to be improved in comparison to control cells with NiNbO-modified or pristine separators.
锂硫（Li-S）电池受到多硫化锂（LiPSs）缓慢的电化学动力学和较差的可逆性的阻碍，这限制了它们的实际能量密度和循环寿命。为了解决这个问题，通过静电纺丝和氮化合成了一种新型的NiN/NbN异质结构，作为聚丙烯（PP）隔膜的功能涂层。进行了吸附实验，以确定该异质结构对LiPSs具有优异的亲和力，从而有效地减轻它们的穿梭效应。硫化锂成核研究表明该物质在加速硫化锂沉积动力学方面具有催化作用。因此，发现采用NiN/NbN改性隔膜的锂硫电池具有显著增强的电化学性能，在0.2 C下电池的初始放电容量为1294.4 mAh g。结果表明，经过150次循环后，电池保留了796.2 mAh g的放电容量，对应于仅0.25%/循环的低容量衰减率。此外，与使用NiNbO改性或原始隔膜的对照电池相比，发现该电池的倍率性能得到了改善。
