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III.A.7 12 Volt Start/Stop Battery Development Tataria – USABC, Duffield – Saft With the cost reduction advantages offered by LTO chemistry and the monoblock module design, the proposed NMC-LTO monoblock battery system will meet the USABC cost target. Results Polymer Material Study. Saft is currently working with Virginia Commonwealth University (VCU) Department of Chemical and Life Science Engineering to conduct polymer material studies. A paper study of potential polymer candidates for the battery case has been completed. Based on Saft’s polymer requirements, VCU has identified a number of polymer candidates. VCU will now begin lab studies of the polymer candidates. Lab studies will include moisture absorption, chemical degradation, mechanical properties, and thermal degradation. Electrolyte Development. Initially cells have been built using our low temperature electrolytes which were Table III - 8: Electrolyte formulation test matrix previously developed for our graphite anode Li-ion cells. The study of novel electrolytes is limited with LTO based Li-ion cells. Saft is investigating numerous typical and atypical solvents. In addition, we are studying different salts and molarities. The testing of the electrolytes (using SAFT-provided electrodes) is sub- contracted to Wildcat Discovery Technologies (WDT). These tests of coin cells will screen for low temperature performance, and gas generation at 70°C. We are focusing our work to a select set of electrolyte formulations for optimal low temperature performance while maintaining stable high temperature impedance growth. After we have narrowed the electrolyte studies using Wildcat Discovery Technology’s rapid prototyping and testing, we will examine these select electrolytes for gas generation. An example of the components to be studied is given in Table III - 8. The investigation will focus on component formulations 1 to 8. Cell Development. There are three cell deliverables within the program. The first occurred after three months in the program and consisted of 5 LP10 Ah cells for early review and testing by USABC. The second is a set of 15 LTO-NMC prismatic cells. These will be delivered to USABC after approximately nine months in the program for independent testing & evaluation (reference cell). The final capacity of these cells will vary due to a fixed hardware size. It is currently estimated that the cells will have a capacity of 10-15Ah. The third and final deliverable is a set of 20 optimized LTO-NMC cells in PHEV-2 VDA size housings at the end of the program. These prismatic cells will also be built in a stacked electrode configuration and have a capacity of 10-15Ah. The first deliverable of five LP10 Ah sized cells has been built and shipped to Idaho National Laboratory for testing according to the USABC 12V Start-Stop manual. Internal Saft testing reveal the deliverable cells meet cold cranking spec at 75% SOC at the end of the 4.0 second pulse and ~65% at the end of the 0.5 second pulse (Figure III - 23). However, the cells are not aged, thus the data reflects beginning of life performance. Energy Storage R&D 54 FY 2013 Annual Progress ReportPDF Image | Advanced Battery Development
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