Aluminum-doped lithium nickel cobalt oxide electrodes for high-power lithium-ion batteries.
Non-doped and aluminum-doped LiNi{sub 0.8}Co{sub 0.2}O{sub 2} cathodes from three industrial developers coupled with graphite anodes were made into lithium-ion cells for high-power applications. The powder morphology of the active cathode materials was examined by a scanning electron microscope. The electrochemical performance of these cells was investigated by hybrid pulse power characterization (HPPC) testing, accelerated aging, and AC impedance measurement of symmetric cells. Although all of the fresh cells are found to meet and exceed the power requirements set by PNGV, the power capability of those cells with non-doped LiNi {sub 0.8}Co{sub 0.2}O{sub 2} cathodes fades rapidly due to the rise of the cell impedance. Al-doping is found very effective to suppress the cell impedance rise by stabilizing the charge-transfer impedance on the cathode side. The stabilization mechanism may be related to the low average oxidation state of nickel ions in the cathode. The powder morphology also plays a secondary role in determining the impedance stabilization.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- EE
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 961364
- Report Number(s):
- ANL/CMT/JA-47131
- Journal Information:
- J. Power Sources, Journal Name: J. Power Sources Journal Issue: 2 ; Apr. 5, 2004 Vol. 128; ISSN JPSODZ; ISSN 0378-7753
- Country of Publication:
- United States
- Language:
- ENGLISH
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Related Subjects
25 ENERGY STORAGE
AGING
ALUMINIUM
ANODES
CATHODES
COBALT OXIDES
DOPED MATERIALS
ELECTRIC BATTERIES
ELECTRODES
ELECTRON MICROSCOPES
GRAPHITE
HYBRIDIZATION
IMPEDANCE
LITHIUM
LITHIUM IONS
LITHIUM OXIDES
MATERIALS
MORPHOLOGY
NICKEL
NICKEL IONS
NICKEL OXIDES
PERFORMANCE
POWDERS
PULSES
STABILIZATION
TESTING
USES
VALENCE