Na3V2(PO4)3 with specially designed carbon framework as high performance cathode for sodium-ion batteries
| Autor: | Su-E. Hao, Guo-Rui Wu, Liang Deng, Li-Li Zheng, Yuan Xue, Zhen-Bo Wang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Aggregate (composite) Materials science Process Chemistry and Technology chemistry.chemical_element 02 engineering and technology Electron Conductivity 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Electron transport chain Cathode Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Viscosity chemistry Chemical engineering law 0103 physical sciences Materials Chemistry Ceramics and Composites 0210 nano-technology Carbon |
| Zdroj: | Ceramics International. 45:4637-4644 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2018.11.153 |
| Popis: | The structures of materials have great influence on their properties. For materials with low electron conductivity, fast electron transport pathway can be constructed through carbon structure design. Here we report a simple but effective method to improve the electrochemical performances of Na3V2(PO4)3. Polyvinyl Pyrrolidone (PVP) can improve the viscosity of the precursor solution, thus forming aggregate structured material. In Na3V2(PO4)3, primary particles with a diameter of approximately 300 nm are aggregated through a special carbon network to form micro-sized secondary particles. This kind of structure will provide easy access for electron transportation, thereby improving electrochemical performance of the material. As a cathode material for sodium-ion batteries, Na3V2(PO4)3 delivers excellent rate (86.6 mAh g−1 at 30 C) and cycling performance (capacity retention of 88.4% after 2000 cycles at 10 C). The material also exhibits a specific capacity of 100.2 mAh g−1 at 5 C under 55 °C. The above-mentioned performance is far better than the control sample without PVP. The special carbon network provides electron transport channels which improves the electrochemical performance of the material. This method may provide new ideas for the preparation of phosphate materials. |
| Databáze: | OpenAIRE |
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