期刊
NANO ENERGY
卷 41, 期 -, 页码 452-459出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.09.056
关键词
Na3V2O2(PO4)(2)F; Spray-drying; Graphene skeleton; Microsphere; Sodium-ion battery
类别
资金
- National Key Research and Development Program of China [2016YFA0202603]
- National Basic Research Program of China [2013CB934103]
- National Natural Science Foundation of China [51602239]
- Hubei Provincial Natural Science Foundation of China [2016CFB267]
- Fundamental Research Funds for the Central Universities (WUT) [2016III003, 2016IVA090, 2017III005, 2017-zy-008]
- China Scholarship Council [201606955096]
Na3V2O2(PO4)(2)F (NVOPF) is a promising cathode material for sodium-ion batteries (SIBs) due to its high working voltage and theoretical capacity. However, the electrochemical performance is strongly impeded by its poor intrinsic electronic conductivity. Herein, we integrated the high flexible graphene sheets with NVOPF through a spray-drying method to re-construct its structure. The NVOPF nanocrystalline particles are homogeneously embedded in the high electronic conductive graphene framework. As a cathode of SIBs, the robust NVOPF/rGO microsphere composite exhibits excellent electrochemical performance: high specific capacity (127.2 mA h g(-1)), long-term cycling stability (83.4% capacity retention at 30 C after 2000 cycles) and superior high rate performance (70.3 mA h g(-1) at 100 C). Furthermore, the Na+ insertion/extraction mechanism is also investigated by in-situ XRD and ex-situ HRTEM monitor technologies. This work demonstrates that the constructed 3D graphene skeleton serves as a high-efficient electronic conduction matrix and improves the electrochemical properties of electrode materials for advanced energy storage applications.
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