Characterization of high-power lithium-ion cells during constant current cycling. Part I. Cycle performance and electrochemical diagnostics
Twelve-cm{sup 2} pouch type lithium-ion cells were assembled with graphite anodes, LiNi{sub 0.8}Co{sub 0.15}Al{sub 0.05}O{sub 2} cathodes and 1M LiPF{sub 6}/EC/DEC electrolyte. These pouch cells were cycled at different depths of discharge (100 percent and 70 percent DOD) at room temperature to investigate cycle performance and pulse power capability. The capacity loss and power fade of the cells cycled over 100 percent DOD was significantly faster than the cell cycled over 70 percent DOD. The overall cell impedance increased with cycling, although the ohmic resistance from the electrolyte was almost constant. From electrochemical analysis of each electrode after cycling, structural and/or impedance changes in the cathode are responsible for most of the capacity and power fade, not the consumption of cycleable Li from side-reactions.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Energy Efficiency and Renewable Energy. FreedomCAR & Vehicle Technologies Program (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 815355
- Report Number(s):
- LBNL-52092; JPSODZ; R&D Project: 674501; TRN: US200319%%178
- Journal Information:
- Journal of Power Sources, Vol. 122, Issue 2; Other Information: Journal Publication Date: July 23, 2003; PBD: 24 Jan 2003; ISSN 0378-7753
- Country of Publication:
- United States
- Language:
- English
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