Self-assembled three-dimensional mesoporous ZnFe2O4-graphene composites for lithium ion batteries with significantly enhanced rate capability and cycling stability
| Autor: | Juan Antonio Zapien, Ying-San Chui, Yang Xia, Yucheng Dong, Chenwei Cao |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Graphene Energy Engineering and Power Technology Nanoparticle chemistry.chemical_element Nanotechnology Electrolyte Electrochemistry Lithium-ion battery Anode law.invention chemistry law Lithium Electrical and Electronic Engineering Physical and Theoretical Chemistry Composite material Mesoporous material |
| Zdroj: | Journal of Power Sources. 275:769-776 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2014.11.005 |
| Popis: | We report a facile, one-pot hydrothermal strategy to prepare self-assembled three-dimensional mesoporous ZnFe2O4 submicron-sized spheres wrapped in graphene sheets as high-performance anode material for lithium ion batteries. The mesoporous submicron-sized spheres are composed of numerous nanoparticles where the void spaces between the neighboring nanoparticles provide a cushion to alleviate volume variation issues during the conversion/alloying process and also provide large contact areas with the electrolyte to facilitate lithium ion diffusion and electron transport during cycling. The synergistic effects between ZnFe2O4 submicron-sized spheres and graphene sheets are another positive effect to enhance the electrochemical performance. The electrochemical characterization of ZnFe2O4-graphene composites exhibits a high specific capacity of 1182 mAh g−1 cycling at a specific current of 100 mA g−1, and significantly enhanced rate capability and cycling stability after long-term testing resulting from their unique structure features. |
| Databáze: | OpenAIRE |
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