Nanocrystalline transition metal ferrite thin films prepared by an electrochemical route for Li-ion batteries
| Autor: | Yan-Na NuLi, Qi-Zong Qin |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Metallurgy Alloy Spinel Energy Engineering and Power Technology engineering.material Nanocrystalline material Lithium battery Tetragonal crystal system Chemical engineering engineering Ferrite (magnet) Crystallite Electrical and Electronic Engineering Physical and Theoretical Chemistry Thin film |
| Zdroj: | Journal of Power Sources. 142:292-297 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2004.10.015 |
| Popis: | Nanocrystalline ferrite MFe 2 O 4 (M = Cu, Ni, Co) thin films have been prepared by an electrochemical route involving cathodic electrodeposition of MFe 2 alloys and further anodization of the alloy films at room temperature. XRD measurements showed that those films are polycrystalline with spinel tetragonal structure for CuFe 2 O 4 , and cubic structure for NiFe 2 O 4 and CoFe 2 O 4 , respectively. The uniform MFe 2 O 4 films without cracks and pinholes were observed in SEM measurement, and the estimated grain average sizes of as-prepared ferrite films were about 50 nm. The electrochemical measurements showed that MFe 2 O 4 thin film electrodes delivered a reversible capacity of 450–460 mAh g −1 at 10 μA cm −2 in the voltage range of 0.01–3.0 V and more than 75% reversible capacity still remained up to 100 cycles. Our results showed that MFe 2 O 4 thin films could be used as promising anode materials for thin film lithium-ion batteries. |
| Databáze: | OpenAIRE |
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