Hydrothermal growth kinetics and electrochemical properties of Li2FeSiO4 nanoparticles
| Autor: | Hongli An, Jie Zhao, Lei Liu, Guangyue Shi, Tianrou Lian, Yuxiao Lu, Lei Ma |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Arrhenius equation
Materials science Scanning electron microscope Mechanical Engineering Metals and Alloys Nucleation Nanoparticle 02 engineering and technology Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Hydrothermal circulation 0104 chemical sciences Dielectric spectroscopy Grain growth symbols.namesake Chemical engineering Mechanics of Materials Materials Chemistry symbols 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 797:1232-1239 |
| ISSN: | 0925-8388 |
| Popis: | Li2FeSiO4 nanoparticles are successfully prepared using the hydrothermal method under different dynamic growth conditions. Structure and morphology of the samples are characterized using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The nucleation activation energy in the initial nucleation process of Li2FeSiO4 nanoparticles is 49.1 kJ mol−1 based on the Arrhenius equation. The grain growth kinetics of Li2FeSiO4 is further discussed based on Lifshitz-Slyozov-Wagner (LSW) model with the equation D3 = (9.16 × 107) t exp(-41.3/T). Small activation energies of nucleation and growth confirm a low kinetic barrier for Li2FeSiO4 nanoparticle formation under hydrothermal conditions, as well as depicting nanoparticle growth as a diffusion-controlled process. Carbon coated Li2FeSiO4 samples, prepared at 210 °C with reaction times of 3 and 72 h, respectively, are used as cathode materials in half-cell batteries, and deliver initial discharge specific capacities of 152.4 and 145.2 mA h g−1 at 0.1 °C. Both samples display good cycle performance with a specific discharge capacity of 147.4 and 140.8 mA h g−1, respectively, after 50 cycles. The corresponding values of Li-ion diffusion coefficient of the samples obtained using electrochemical impedance spectroscopy are 1.50 × 10−13 and 5.76 × 10−14 cm2 s−1, respectively. |
| Databáze: | OpenAIRE |
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