Electrochemical properties of polydopamine coated Ti-Si alloy anodes for Li-ion batteries
| Autor: | Ji-Sun Lee, Sung-Man Lee, Min-Seon Shin |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
congenital
hereditary and neonatal diseases and abnormalities Materials science Scanning electron microscope General Chemical Engineering education Alloy 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences X-ray photoelectron spectroscopy Coating health services administration Electrochemistry Metallurgy technology industry and agriculture equipment and supplies 021001 nanoscience & nanotechnology 0104 chemical sciences Anode Dielectric spectroscopy Chemical engineering Transmission electron microscopy engineering 0210 nano-technology Layer (electronics) |
| Zdroj: | Electrochimica Acta. 222:1200-1209 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2016.11.094 |
| Popis: | We report a strategy to enhance the cycling performance of a Ti-Si alloy anode by coating it with Polydopamine (PDA) as an adhesive and elastic polymer layer. The PDA was coated on a Ti-Si alloy prepared using the mechanical alloying method. The PDA coating is confirmed by X-ray photoelectron spectroscopy (XPS) and cross sectional transmission electron microscopy (TEM). The PDA coated Ti-Si alloy shows improved cycling performance with enhanced coulombic efficiency during cycling. Because the PDA coating suppresses direct contact between the Ti-Si alloy and the electrolyte during charge-discharge cycling and, hence, the initially formed SEI film remains in a stable state during cycling. After 50 cycles, the SEI layer formed on the alloy particles is much thicker in the bare alloy electrode than in the PDA coated alloy electrode. This result is supported by electrochemical impedance spectroscopy (EIS) measurement and cross-sectional scanning electron microscopy (SEM) images before cycling and after 50 cycles. |
| Databáze: | OpenAIRE |
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