Mo3P/Mo heterojunction for efficient conversion of lithium polysulfides in high-performance lithium-sulfur batteries

• Published in: Frontiers in chemistry Vol. 12; p. 1459324
• Main Authors: Sun, Zhongpeng, Wang, Yuanhao, Xu, Jie, Wang, Xia
• Format: Journal Article
• Language: English
• Published: Frontiers Media S.A 12-08-2024
• Subjects: Chemistry; heterogeneous structure; lithium-sulfur batteries; Mo3P; three-dimensional ordered porous (3DOP) architecuture
• ISSN: 2296-2646; 2296-2646
• DOI: 10.3389/fchem.2024.1459324

Realizing efficient immobilization of lithium polysulfides (LiPSs) as well as reversible catalytic conversion between LiPSs and the insoluble Li 2 S is vital to restrain the shuttle effect, which requires highly reactive catalysts for high-performance Li-S batteries. Here, three-dimensional ordered porous Mo-based metal phosphides (3DOP Mo 3 P/Mo) with heterogeneous structures were fabricated and utilized as separator-modified coatings for Li-S batteries to catalyze the conversion of LiPSs. The adsorption, catalytic and electrochemical performance of the corresponding cells were compared among 3DOP Mo 3 P/Mo and 3DOP Mo, by kinetic and electrochemical performance measurements. It was found that the cell with 3DOP Mo 3 P/Mo modified separator deliver better electrochemical performance, with a high specific capacity of 469.66 mAh g −1 after 500 cycles at a high current density of 1°C. This work provides an idea and a guideline for the design of the separator modification for high-performance Li-S batteries.