| Autor: |
Meng, Xiangzeng, Chen, Zongmin, Hong, Shouyu, Jin, Luqiao, Liu, Hongfu, He, Cheng, Che, Yeqiang, Zhang, Ze, Yu, Ji, Yang, Zhenyu, Cai, Jianxin |
| Zdroj: |
Materials Today Chemistry; December 2024, Vol. 42 Issue: 1 |
| Abstrakt: |
The introduction of heterostructures into the cathode materials of Li–S batteries can effectively anchor polysulfides, accelerate their redox reactions, and suppress the shuttle effect, thereby enhancing the sulfur utilization rate and the cycling stability of the battery. This work synthesized heterostructure materials TiO2nanotubes loaded with WS2and MoS2via the hydrothermal method, forming heterostructure materials that enhance the catalytic conversion of LiPSs. Characterization results show that the tube-flower-like morphology and the tight interfacial connections between the components exhibit a strong adsorption capacity for LiPSs. These heterostructures accelerates the redox kinetics of the LiPSs transformation. Symmetrical cell tests further confirmed the bidirectional catalytic activity of WS2–TiO2and MoS2–TiO2for the rapid redox transformation of liquid-liquid conversion. The electrochemical test results indicate that the discharge-specific capacities of the S@WS2–TiO2and S@MoS2–TiO2cathodes were 1143.67 mAh g−1and 1086.2 mAh g−1at 0.1C, respectively, and 625.6 mAh g−1and 589.7 mAh g−1at 4C current density, demonstrating superior rate performance, high reversibility, and excellent cycling stability at high current densities. Introducing WS2and MoS2into TiO2nanotubes to construct heterojunction materials provides a promising strategy for enhancing the performance of Li–S batteries. |
| Databáze: |
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