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III.A.8 Advanced, Lithium Ion, 12V Start-Stop Battery Bae – USABC, Juzkow – Leyden Energy Figure III - 28: Thermal performance test on 2.2Ah prototype cells Superior charge acceptance, even at low temperatures, is distinguishing feature of the LTO chemistry. It remains high and significantly above 2.2kW target to enable regenerative braking across a wide range of SOC as USABC L-HPPC pulse data demonstrates in Figure III - 29. Figure III - 30: USABC shallow cycling at 30°C on 2.2Ah cells Leyden has also demonstrated stable shallow cycling at 50°C (shown in Figure III - 31) for the cells delivered to ANL and NREL. Further improvements in cycle life at high temperature are expected to emerge from our development work on an electrolyte additive package and surface treatments. To date, Leyden has evaluated >15 surface treatment techniques. The test results comparison of the most promising surface treatments are shown on Figure III - 32. Figure III - 31: USABC shallow cycling at 50°C on 2.2Ah cells Figure III - 29: USABC L-HPPC test on 2.2Ah prototype cells Cycle life. Cycle life at 30°C and higher temperatures remains the focus of Leyden development. Over the past few months, Leyden has finalized the choice of LMO and LTO materials in terms of high temperature cycle life; developed and optimized electrode formulations, completed process development for prototype cell assembly and initiated work on formation thermal treatments that improve high temperature performance. This allowed us to meet the USABC cycle life requirements: as shown on Figure III - 30; we project to reach >450k shallow cycles at 30°C. Energy Storage R&D 58 FY 2013 Annual Progress Report Figure III - 32: Comparison of most promising surface treatments in 0.8Ah prototype cells in 60°C unconstrained cycling; 1C/1C 1.5-2.7VPDF Image | Advanced Battery Development
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