Recyclable cobalt-molybdenum bimetallic carbide modified separator boosts the polysulfide adsorption-catalysis of lithium sulfur battery
| Autor: | Cheng-Yen Lao, Jian-Wei Liu, Shiyao Lu, Zhenyu Yang, Kai Xi, Ji Yu, Qiu Jiang, Huanglong Li, Dong-Gen Xiong, Jianan Wang, R. Vasant Kumar, Ze Zhang, A.-Hu Shao |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Lithium–sulfur battery 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences 0104 chemical sciences Catalysis Carbide chemistry.chemical_compound chemistry Chemical engineering General Materials Science 0210 nano-technology Bimetallic strip Polysulfide Separator (electricity) Sulfur utilization |
| Zdroj: | Science China Materials. 63:2443-2455 |
| ISSN: | 2199-4501 2095-8226 |
| Popis: | The polysulfide shuttling and sluggish redox kinetics, due to the notorious adsorption-catalysis underperformance, are the ultimate obstacles of the practical application of lithium-sulfur (Li-S) batteries. Conventional carbon-based and transition metal compound-based material solutions generally suffer from poor catalysis and adsorption, respectively, despite the performance gain in terms of the other. Herein, we have enhanced polysulfide adsorption-catalytic capability and protected the Li anode using a complementary bimetallic carbide electrocatalyst, Co3Mo3C, modified commercial separator. With this demonstration, the potentials of bimetal compounds, which have been well recognized in other environmental catalysis, are also extended to Li-S batteries. Coupled with this modified separator, a simple cathode (S/Super P composite) can deliver high sulfur utilization, high rate performance, and excellent cycle stability with a low capacity decay rate of ∼0.034% per cycle at 1 C up to 1000 cycles. Even at a high S-loading of 8.0 mg cm−2 with electrolyte/sulfur ratio=6 mL g−1, the cathode still exhibits high areal capacity of ∼6.8 mA h cm−2. The experimental analysis and the first principles calculations proved that the bimetallic carbide Co3Mo3C provides more binding sites for adsorbing polysulfides and catalyzing the multiphase conversion of sulfur/polysulfide/sulfide than monometallic carbide Mo2C. Moreover, the modified separator can be reutilized with comparable electrochemical performance. We also showed other bimetallic carbides with similar catalytic effects on Li S batteries and this material family has great promise in different energy electrocatalytic systems. |
| Databáze: | OpenAIRE |
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