Mixed Polyanion Glass Cathodes: Iron Phosphate Vanadate Glasses
| Autor: | Joanne Oxendine Ramey, James O. Kiggans, Lynn A. Boatner, Roberta A. Meisner, Nancy J. Dudney, Gabriel M. Veith, Andrew K. Kercher, K. J. Carroll |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Inorganic chemistry Intercalation (chemistry) chemistry.chemical_element Manganese Condensed Matter Physics Electrochemistry Lithium-ion battery Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Materials Chemistry Lithium Vanadate Iron phosphate Cobalt phosphate |
| Zdroj: | Journal of The Electrochemical Society. 161:A2210-A2215 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/2.0881414jes |
| Popis: | Mixed polyanion (MP) glasses have been investigated for use as cathodes in lithium ion batteries. MP glass cathodes are similar in composition to theoretically promising crystalline polyanionic (CP) cathodes (e.g., lithium cobalt phosphate, lithium manganese silicate), but with proper polyanion substitution, they can be designed to overcome the key shortcomings of CP cathodes, such as poor electrical conductivity and irreversible phase changes. Iron phosphate/vanadate glasses were chosen as a first demonstration of the MP glass concept. Polyanion substitution with vanadate was shown to improve the intercalation capacity of an iron phosphate glass from almost zero to full theoretical capacity. In addition, the MP glass cathodes also exhibited an unexpected second high-capacity electrochemical reaction. X-ray absorption near-edge structure (XANES) and x-ray diffraction (XRD) of cathodes from cells having different states of charge suggested that this second electrochemical reaction is a glass-state conversion reaction. With a first demonstration established, MP glass materials utilizing an intercalation and/or glass-state conversion reaction are promising candidates for future high-energy cathode research. |
| Databáze: | OpenAIRE |
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