Atomic Insight into the Layered/Spinel Phase Transformation in Charged LiNi0.80Co0.15Al0.05O2 Cathode Particles
| Autor: | M. Stanley Whittingham, Hanlei Zhang, Eric A. Stach, Yiqing Huang, Khim Karki, Guangwen Zhou |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Spinel Mineralogy 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cathode 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Ion General Energy Transition metal Electron diffraction Chemical physics Transmission electron microscopy law Lattice (order) engineering Energy density Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry C. 121:1421-1430 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.6b10220 |
| Popis: | Layered LiNi0.80Co0.15Al0.05O2 (NCA) holds great promise as a potential cathode material for high energy density lithium ion batteries. However, its high capacity is heavily dependent on the stability of its layered structure, which suffers from a severe structure degradation resulting from a not fully understood layered → spinel phase transformation. Using high-resolution transmission electron microscopy and electron diffraction, we probe the atomic structure evolution induced by the layered → spinel phase transformation in the NCA cathode. We show that the phase transformation results in the development of a particle structure with the formation of complete spinel, spinel domains, and intermediate spinel from the surface to the subsurface region. The lattice planes of the complete and intermediate spinel phases are highly interwoven in the subsurface region. The layered → spinel transformation occurs via the migration of transition metal (TM) atoms from the TM layer into the lithium layer. Incomplete mi... |
| Databáze: | OpenAIRE |
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