XAFS Study on Deterioration of Cathode Materials for Lithium-Ion Batteries
- Toyota Central R and D Labs., Inc., 41-1, Nagakute, Aichi, 480-1192 (Japan)
LiNi0.8CO0.15Al0.05O2, being one of the promising cathode materials for lithium-ion batteries, shows a distinct capacity fading after charge/discharge cycling and/or storage at high temperatures. The origin of these deteriorations has been explored by investigating the electronic and structural changes of the cathode material using X-ray absorption spectroscopy. Ni K-edge XAFS measurements were performed in two different modes: surface-sensitive conversion electron yield (CEY) mode and bulk-sensitive transmission mode. The Ni K-edge XANES showed that, after the cycle and aging tests, the Ni valences at the near-surface of the cathode particles became much lower than those in bulk. Whereas, the EXAFS showed that the bulk and surface-averaged Ni-O bond distances remained unchanged after the tests. These electronic and structural changes which occur prominently at near-surface are probably the main cause of the battery deterioration phenomenon.
- OSTI ID:
- 21054717
- Journal Information:
- AIP Conference Proceedings, Vol. 882, Issue 1; Conference: XAFS13: 13. international conference on X-ray absorption fine structure, Stanford, CA (United States), 9-14 Jul 2006; Other Information: DOI: 10.1063/1.2644630; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTROSCOPY
ALUMINIUM OXIDES
BOND LENGTHS
CAPACITY
CATHODES
CRYSTAL STRUCTURE
ELECTRIC BATTERIES
ELECTROCHEMISTRY
ELECTRONIC STRUCTURE
ELECTRONS
FINE STRUCTURE
LITHIUM COMPOUNDS
LITHIUM IONS
NICKEL
NICKEL COMPOUNDS
PARTICLES
SURFACES
X-RAY SPECTROSCOPY