Preparation and electrochemical properties of carbon-coated LiFePO4 hollow nanofibers
| Autor: | Ya-nan Zhou, Bin-bin Wei, Fang-yuan Yu, Yanbo Wu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Scanning electron microscope Mechanical Engineering Metals and Alloys Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Electrospinning Cathode 0104 chemical sciences Dielectric spectroscopy law.invention Chemical engineering Geochemistry and Petrology Mechanics of Materials Transmission electron microscopy law Specific surface area Nanofiber Materials Chemistry 0210 nano-technology Faraday efficiency |
| Zdroj: | International Journal of Minerals, Metallurgy, and Materials. 23:474-480 |
| ISSN: | 1869-103X 1674-4799 |
| DOI: | 10.1007/s12613-016-1258-4 |
| Popis: | Carbon-coated LiFePO4 hollow nanofibers as cathode materials for Li-ion batteries were obtained by coaxial electrospinning. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer–Emmett–Teller specific surface area analysis, galvanostatic charge–discharge, and electrochemical impedance spectroscopy (EIS) were employed to investigate the crystalline structure, morphology, and electrochemical performance of the as-prepared hollow nanofibers. The results indicate that the carbon-coated LiFePO4 hollow nanofibers have good long-term cycling performance and good rate capability: at a current density of 0.2C (1.0C = 170 mA·g−1) in the voltage range of 2.5–4.2 V, the cathode materials achieve an initial discharge specific capacity of 153.16 mAh·g−1 with a first charge–discharge coulombic efficiency of more than 97%, as well as a high capacity retention of 99% after 10 cycles; moreover, the materials can retain a specific capacity of 135.68 mAh·g−1, even at 2C. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink