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| Constructing the Mo2C/C heterojunction to achieve high performance lithium-sulfur batteries |
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Received:November 25, 2024
Revised:December 04, 2024
Accepted:December 05, 2024
Published Online:January 21, 2025
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| DOI： |
| KeyWord:lithium-sulfur batteries; polysulfide; shuttle effect; catalysts; Mo2C/C heterojunction |
| Author | Institution |
| DONG Ming |
College of Chemistry and Life Sciences,Changchun University of Technology |
| YU Hongmin |
College of Chemistry,Northeast Normal University |
| HAN Miao |
College of Physics,Jilin Normal University |
| WANG Zhibing |
College of Chemistry and Life Sciences,Changchun University of Technology |
| WANG Zhao |
College of Physics,Jilin Normal University |
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| Abstract: |
| Lithium-sulfur batteries are highly regarded for their outstanding theoretical energy and high energy density, but the severe shuttle effect of lithium polysulfides (LiPSs) limits their commercialization. Combining carbon materials with high specific surface area and catalysts that accelerate the conversion of lithium polysulfides is considered an effective strategy. Nevertheless, there is still a lack of in-depth investigation on how to construct heterojunction between carbon materials and catalysts, and probe their effects on the performance of lithium-sulfur batteries. In this study, Mo2C was prepared by annealing calcination method and coated onto microporous polypropylene membrane together with porous carbon to obtain Mo2C/C@PP composite membrane. The electrochemical performance test results show that the Mo2C/C heterojunction-rich composite can trap soluble polysulfides, improve the solid-liquid interface of the electrolyte/separator, suppress the shuttle of polysulfides, enhance the utilization of sulfur cathode, induce uniform deposition of lithium, and improve the rate performance. It exhibits a high initial specific capacity of 773.3 mAh g-1 at 1 C rate and maintains 615.1 mAh g-1 after 500 cycles, with a capacity decay of only 0.041 % per cycle. This study has positive guiding significance for the design and development of high-performance lithium sulfur batteries. |
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