A MoO3/MoO2-CP self-supporting heterostructure for modification of lithium–sulfur batteries
| Autor: | Haowu Wang, Qian Chen, Shiqiang Cui, Pengbo Zhai, Wei Liu, Jing Xiao, Yi Wei, Shengjian Qin, Chunqiao Jin, Yongji Gong, Weiwei Yang, Shengdong Tan, Jinghan Zuo, Jia-Xiang Shang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment business.industry chemistry.chemical_element Heterojunction 02 engineering and technology General Chemistry Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode Energy storage 0104 chemical sciences law.invention chemistry law Electrode Optoelectronics General Materials Science Lithium Atomic ratio 0210 nano-technology business |
| Zdroj: | Journal of Materials Chemistry A. 8:15816-15821 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d0ta01664k |
| Popis: | Heterostructures have attracted extensive attention because of their unique structure and multiple functions, showing potential for various energy storage and conversion techniques. Here, inspired by the potential advantages of heterostructures, we design an insulating MoO3/conducting MoO2 heterostructure as a host for lithium octasulfide (Li2S8) for lithium–sulfur batteries. Different from other heterostructures with a sharp interface, the transition state of MoOx is proved to have a large atomic ratio (∼18%). Benefiting from the good conductivity of MoO2 and the strong polarity of MoOx to adsorb LiPS, the initial specific capacity of the MoO3/MoO2-CP-Li2S8 cathode is 898.4 mA h g−1 and drops to 828.1 mA h g−1 after 500 cycles at 0.5C, showing a 92.2% retention of the initial capacity. Meanwhile, it can deliver an initial specific capacity of 580.5 mA h g−1 at 2.5C with a capacity retention of 82.8% after 850 cycles. This work shows that the heterostructures of 2D materials are promising as a Li2S8 host because of their multiple functions and may provide new strategies to design electrochemical electrodes. |
| Databáze: | OpenAIRE |
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