Revisiting the conversion reaction voltage and the reversibility of the CuF2 electrode in Li-ion batteries
| Autor: | Y. Shirley Meng, Karena W. Chapman, Katsunori Takahara, Hyung-Man Cho, Mahsa Sina, Joon Kyo Seo, Olaf J. Borkiewicz |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
reaction voltage Nanotechnology 02 engineering and technology Electrolyte 010402 general chemistry Electrochemistry 01 natural sciences Affordable and Clean Energy reversibility Transition metal MD Multidisciplinary Li-ion battery General Materials Science Nanoscience & Nanotechnology Electrical and Electronic Engineering Dissolution nanoparticle Electron energy loss spectroscopy Non-blocking I/O coating 021001 nanoscience & nanotechnology Condensed Matter Physics conversion material Atomic and Molecular Physics and Optics Surface energy 0104 chemical sciences Chemical engineering Electrode 0210 nano-technology |
| Zdroj: | Nano Research, vol 10, iss 12 Seo, Joon Kyo; Cho, Hyung-Man; Takahara, Katsunori; Chapman, Karena W; Borkiewicz, Olaf J; Sina, Mahsa; et al.(2017). Revisiting the conversion reaction voltage and the reversibility of the CuF2 electrode in Li-ion batteries. Nano Research, 10(12), 4232-4244. doi: 10.1007/s12274-016-1365-6. UC San Diego: Retrieved from: http://www.escholarship.org/uc/item/61s9d12s NANO RESEARCH, vol 10, iss 12 |
| ISSN: | 1998-0000 1998-0124 |
| DOI: | 10.1007/s12274-016-1365-6 |
| Popis: | Deviation between thermodynamic and experimental voltages is one of the key issues in Li-ion conversion-type electrode materials; the factor that affects this phenomenon has not been understood well in spite of its importance. In this work, we combine first principles calculations and electrochemical experiments with characterization tools to probe the conversion reaction voltage of transition metal difluorides MF2 (M = Fe, Ni, and Cu). We find that the conversion reaction voltage is heavily dependent on the size of the metal nanoparticles generated. The surface energy of metal nanoparticles appears to penalize the reaction energy, which results in a lower voltage compared to the thermodynamic voltage of a bulk-phase reaction. Furthermore, we develop a reversible CuF2 electrode coated with NiO. Electron energy loss spectroscopy (EELS) elemental maps demonstrate that the lithiation process mostly occurs in the area of high NiO content. This suggests that NiO can be considered a suitable artificial solid electrolyte interphase that prevents direct contact between Cu nanoparticles and the electrolyte. Thus, it alleviates Cu dissolution into the electrolyte and improves the reversibility of CuF2. |
| Databáze: | OpenAIRE |
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