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III.A.4 Advanced High-Performance Batteries for PEV Applications Arsenault – USABC, Judes – JCI 120% 100% 80% 60% 40% 20% 0% 110% 90% 70% 50% 30% 10% ‐10% PL27M 60°C Calendar Life at 4.1V Baseline R12332010 ‐ Ty R12332014 ‐ Ty R12333013 ‐ Ty pe 1.65 Fille pe 1.65 Fille pe 2.5 Filled d d R12 333014 ‐ Ty pe 2.5 Filled 0 50 100 150 200 250 300 350 400 Days Figure III - 16: Ceramic separators calendar life at 60°C Excellent performance was also found when cells with ceramic filled separators were tested at 4.2V at 70°C. After one year storage, cell resistance only increased 34%. Ceramic filled separators lack the shutdown function which is considered to be an essential safety attribute for high energy cells. Efforts with Entek to adjust the ceramic/ polyolefin ratio to achieve full or partial shutdown and retain the life-enhancing properties were not successful. Thermal Protective Barrier (TPB) technology was optimized on thickness, coverage and uniformity, resulting in tangible improvements in abuse tolerance results. Two cathode additives were found to delay the onset of thermal runaway during overcharge with no adverse impact on life detected thus far. A formulation of electrolyte additives for overcharge control showed very promising results with more work required. Next Steps Convergence of design choices based on this work has started. From this, final cells will be produced and delivered in CY Q1 2014. FY 2013 Publications/Presentations Energy Storage R&D 44 FY 2013 Annual Progress Report 1. Presentation to the 2013 DOE Annual Peer Merit Review Meeting (May 13, 2013). Capacity Retention (%) Cell Resistance Increase (%)PDF Image | Advanced Battery Development
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