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Tataria – USABC, Duffield – Saft III.A.7 12 Volt Start/Stop Battery Development Figure III - 23: Cold crank results of 1st deliverable cells Cycling at 30°C on one cell from the deliverable cell lot is given below (Figure III - 24). The impedance growth is presently 3-4% impedance growth at 800 cycles and stabilizing. Figure III - 24: Impedance growth results Conclusions and Future Directions Saft is currently seven months into the one year development program. Saft internal testing of 1st deliverable cells has shown that the cells could meet or exceed most USABC Start-Stop performance targets. The areas of concern for the LTO-NMC cell development continue to be cold crank power at lower states of charge, high temperature impedance growth, and the current high cost of the LTO material. During the remaining months of this program, Saft will continue to evaluate and test ways to reduce or eliminate these concerns. A Design of Experiment is underway to identify the key contributors to high temperature impedance growth and the electrolyte studies currently being conducted at Wildcat Discovery Technologies will lead to an optimized low temperature electrolyte for use in the final deliverable cells. Saft is interested in continuing its development of the LTO/NMC cell for wide scale use in 12V start-stop automotive applications. FY 2013 Publications/Presentations None. FY 2013 Annual Progress Report 55 Energy Storage R&DPDF Image | Advanced Battery Development
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