Structural Transformation of LiFePO4 during Ultrafast Delithiation
| Autor: | Mathieu Saulnier, Guoxian Liang, Steen B. Schougaard, Ngoc Duc Trinh, Christian Kuss, Stefan Andjelic, Eric M. Dufresne |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
020209 energy Lithium iron phosphate chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Electrochemistry 7. Clean energy Lithium battery Ion chemistry.chemical_compound Chemical engineering chemistry Phase (matter) Electrode 0202 electrical engineering electronic engineering information engineering General Materials Science Lithium Physical and Theoretical Chemistry 0210 nano-technology Solid solution |
| Zdroj: | The Journal of Physical Chemistry Letters. 8:6160-6164 |
| ISSN: | 1948-7185 |
| Popis: | The prolific lithium battery electrode material lithium iron phosphate (LiFePO4) stores and releases lithium ions by undergoing a crystallographic phase change. Nevertheless, it performs unexpectedly well at high rate and exhibits good cycling stability. We investigate here the ultrafast charging reaction to resolve the underlying mechanism while avoiding the limitations of prevailing electrochemical methods by using a gaseous oxidant to deintercalate lithium from the LiFePO4 structure. Oxidizing LiFePO4 with nitrogen dioxide gas reveals structural changes through in situ synchrotron X-ray diffraction and electronic changes through in situ UV/vis reflectance spectroscopy. This study clearly shows that ultrahigh rates reaching 100% state of charge in 10 s does not lead to a particle-wide union of the olivine and heterosite structures. An extensive solid solution phase is therefore not a prerequisite for ultrafast charge/discharge. |
| Databáze: | OpenAIRE |
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