Porosity and phase fraction evolution with aging in lithium iron phosphate battery cathodes
| Autor: | Richard T. Hart, Shrikant C. Nagpure, S. Suresh Babu, Garrett J. Noble, Samartha A. Channagiri |
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| Rok vydání: | 2013 |
| Předmět: |
Diffraction
Battery (electricity) Materials science Renewable Energy Sustainability and the Environment Lithium iron phosphate Energy Engineering and Power Technology Ionic bonding Cathode law.invention chemistry.chemical_compound State of charge chemistry law Forensic engineering Electrical and Electronic Engineering Physical and Theoretical Chemistry Composite material Porosity Phase fraction |
| Zdroj: | Journal of Power Sources. 243:750-757 |
| ISSN: | 0378-7753 |
| Popis: | Rechargeable Lithium-ion batteries designed for electric vehicles operate under different charge and discharge rates, state of charge and temperature . However, aging of these batteries due to disruption of ionic or electronic conductivity while operating under these different cycling conditions has been a concern. In this research, we measured statistical distribution of porosity in the cathode as a function of aging and location within the cylindrical battery, using X-Ray micro-computed tomography. A change in porosity (∼20%) of the sample is noticed between aged and unaged samples. Concurrent X-Ray diffraction studies in these samples showed an increase (∼34%) in FePO 4 phase fraction. Structural breakdown of the composite cathode material during charge and discharge cycling is proposed as a possible mechanism to rationalize the above results. |
| Databáze: | OpenAIRE |
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