Chen Haoxian, Wang Jiayi, Zhao Yan, Zeng Qindan, Zhou Guofu, Jin Mingliang
National Center for International Research on Green Optoelectronics, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China.
Nanomaterials (Basel). 2021 Jun 10;11(6):1531. doi: 10.3390/nano11061531.
The severe shuttle effect of soluble polysulfides hinders the development of lithium-sulfur batteries. Herein, we develop a three-dimensionally ordered macro/mesoporous (3DOM) NbO/NbN heterostructure, which combines the strong adsorption of NbO and remarkable catalysis effect of NbN by the promotion "adsorption-transformation" mechanism in sulfur reaction. Furthermore, the high electrocatalytic activity of NbN facilitates ion/mass transfer during the charge/discharge process. As a result, cells with the S-NbO/NbN electrode delivered outstanding cycling stability and higher discharge capacity than its counterparts. Our work demonstrates a new routine for the multifunctional sulfur host design, which offers great potential for commercial high-performance lithium-sulfur batteries.
可溶性多硫化物严重的穿梭效应阻碍了锂硫电池的发展。在此，我们开发了一种三维有序大孔/介孔（3DOM）NbO/NbN异质结构，它通过硫反应中的“吸附-转化”促进机制，结合了NbO的强吸附作用和NbN显著的催化效果。此外，NbN的高电催化活性有利于充放电过程中的离子/质量传输。结果，采用S-NbO/NbN电极的电池展现出出色的循环稳定性，且放电容量高于同类电池。我们的工作展示了一种多功能硫宿主设计的新方法，为商用高性能锂硫电池提供了巨大潜力。
