Electrochemical Analysis of Architecturally Enhanced LiFe0.5Mn0.5PO4 Multiwalled Carbon Nanotube Composite
| Autor: | Sabelo Sifuba, Natasha Ross, Shane Willenberg, Usisipho Feleni, Emmanuel I. Iwuoha |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Nanotube
Materials science Article Subject 020209 energy chemistry.chemical_element Ionic bonding 02 engineering and technology 021001 nanoscience & nanotechnology Electrochemistry Redox Dielectric spectroscopy Electron transfer chemistry Chemical engineering 0202 electrical engineering electronic engineering information engineering T1-995 General Materials Science Lithium Cyclic voltammetry 0210 nano-technology Technology (General) |
| Zdroj: | Journal of Nanotechnology, Vol 2021 (2021) |
| ISSN: | 1687-9511 1687-9503 |
| Popis: | In this work, the effect of carbon on the electrochemical properties of multiwalled carbon nanotube (MWCNT) functionalized lithium iron manganese phosphate was studied. In an attempt to provide insight into the structural and electronic properties of optimized electrode materials, a systematic study based on a combination of structural and spectroscopic techniques was conducted. The phosphor-olivine LiFe0.5Mn0.5PO4 was synthesized via a simple microwave synthesis using LiFePO4 and LiMnPO4 as precursors. Cyclic voltammetry was used to evaluate the electrochemical parameters (electron transfer and ionic diffusivity) of the LiFe0.5Mn0.5PO4 redox couples. The redox potentials show two separate distinct redox peaks that correspond to Mn2+/Mn3+ (4.1 V vs Li/Li+) and Fe2+/Fe3+ (3.5 V vs Li/Li+) due to interaction arrangement of Fe-O-Mn in the olivine lattice. The electrochemical impedance spectroscopy (EIS) results showed LiFe0.5Mn0.5PO4-MWCNTs have high conductivity with reduced charge resistance. This result demonstrates that MWCNTs stimulate faster electron transfer and stability for the LiFe0.5Mn0.5PO4 framework, which demonstrates to be favorable as a host material for Li+ ions. |
| Databáze: | OpenAIRE |
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