Suitable polysulfides adsorption and conversion on MoSe 2 @g-C 3 N 4 interlayer for advanced lithium-sulfur batteries
Applied Surface Science, ISSN: 0169-4332, Vol: 604, Page: 154556
2022
- 12Citations
- 4Captures
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Article Description
The shuttle effect of lithium polysulfides (LiPS) and sluggish redox kinetic still restrict the commercial application of lithium-sulfur batteries (LSBs). Developing the modified functional separators that block the migration of LiPS and accelerate the LiPS conversion is an effective method to solve both problems. Here we report a MoSe 2 @g-C 3 N 4 composite material with the merits of strong adsorption in g-C 3 N 4 and appropriate migration in MoSe 2 for LiPS simultaneously achieved on the surface. g-C 3 N 4 has strong adsorption for LiPS while MoSe 2 with a low migration barrier of LiPS and improves their conversion into solid-state Li 2 S. The excellent wettability of MoSe 2 @g-C 3 N 4 facilitates electrolyte migration and improves the electrochemical performance. With a MoSe 2 @g-C 3 N 4 interlayer delivered 2.2 times increase initial capacity than that with a conventional polypropylene (PP) separator at 0.5C, and a low-capacity decay per cycle of 0.09 % was achieved at 0.5C after 500 cycles. It showed the best rate capability of 564.2 mA h g −1 at 3C. Even under the high sulfur loadings of 3.2 and 4.0 mg cm −2, showing high initial capacity and decent capacity retention. This project provides a novel insight into designing the functional separators with the g-C 3 N 4 substrate composites for stable LSBs.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0169433222020888; http://dx.doi.org/10.1016/j.apsusc.2022.154556; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85136464700&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0169433222020888; https://dx.doi.org/10.1016/j.apsusc.2022.154556
Elsevier BV
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