Three-Dimensionally Ordered Macro/Mesoporous Nb2O5/Nb4N5 Heterostructure as Sulfur Host for High-Performance Lithium/Sulfur Batteries

Nanomaterials

Qindan Zeng¹  Haoxian Chen¹  Guofu Zhou¹  Mingliang Jin¹  Jiayi Wang²  Yan Zhao³ 

[1] 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;School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China;

关键词: Nb₂O₅;    Nb₄N₅;    heterostructure;    lithium-sulfur batteries;   

DOI  :  10.3390/nano11061531

来源: DOAJ

【 摘 要 】

The severe shuttle effect of soluble polysulfides hinders the development of lithium–sulfur batteries. Herein, we develop a three-dimensionally ordered macro/mesoporous (3DOM) Nb₂O₅/Nb₄N₅ heterostructure, which combines the strong adsorption of Nb₂O₅ and remarkable catalysis effect of Nb₄N₅ by the promotion “adsorption-transformation” mechanism in sulfur reaction. Furthermore, the high electrocatalytic activity of Nb₄N₅ facilitates ion/mass transfer during the charge/discharge process. As a result, cells with the S-Nb₂O₅/Nb₄N₅ 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.

【 授权许可】

Unknown