Lithium ion cells (Li-ion) comprising lithium iron phosphate (LiFePO4) based cathode active material are a promising battery technology for future hybrid and electric vehicle applications in terms of safety, cycle and calendar lifetime and cost. Those cells comprise flat open circuit voltage characteristic and a long-term load history dependent cell impedance. In this work the special electric characteristics of LiFePO4 based cells are elucidated, quantified and compared to Li-ion cells containing competing cathode technologies. Through pulse tests and partial cycle tests, performed with various olivine based cells, the cycling history dependency of the internal resistance and therefore on the power capability is show. Hence, methods are illustrated to quantify this load history impact on the cells performance. Subsequently, methods to achieve a safe battery operation are elucidated. Furthermore strategies are given to obtain reliable information about the cells power capability, taking the mentioned properties into consideration.
Influence of cathodes technology on the power capability and charge acceptance of lithium ion batteries
Eunfluss der Kathodentechnologie auf das Leistungsvermögen und die Aufladungseigenschaften von Lithiumionenbatterien
2009
10 Seiten, 10 Bilder, 2 Tabellen, 17 Quellen
Conference paper
Storage medium
English
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