Factors responsible for impedance rise in high power lithium ion batteries.
High-power, 18,650 lithium-ion cells have been designed and fabricated in order to understand the factors limiting the calendar life of the lithium-ion system. Each cell consisted of a LiNi{sub 0.8}Co{sub 0.2}O{sub 2} positive electrode, a blend of MCMB-6 and SFG-6 carbon negative electrode, and a LiPF{sub 6} in EC:DEC (1:1) electrolyte. These cells, which initially meet the power requirement set by the partnership for a new generation of vehicles (PNGV), were subjected to accelerated calendar life and cycle life testing. After testing at elevated temperatures, the cells experienced a significant impedance rise and loss of power. The fade rate of power in these cells was dependent of the state of charge and the temperature of testing. Micro-reference electrode and ac-impedance studies on symmetrical cells have confirmed that the interfacial resistance at the positive electrode was the main reason behind the impedance rise in the high power cell.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- EE
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 943262
- Report Number(s):
- ANL/CMT/JA-38718; JPSODZ; TRN: US200916%%685
- Journal Information:
- J. Power Sources, Vol. 97-8, Issue Jul. 2001; ISSN 0378-7753
- Country of Publication:
- United States
- Language:
- ENGLISH
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