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Tataria – USABC, Lopez – Envia III.A.1 EV Battery Development company. The pack related costs for a 40kWh pack were determined to be $2,626 and volumetric and gravimetric energy and power cell-to-pack multiplication factors found to be 58% and 70%, respectively. Cell cost analysis was also performed determining the cell related selling price to be $258/kWh. Envia has been successful in meeting most of the USABC goals for EV batteries. With respect to calendar life, it is debatable as to whether our cells will meet the 10 year mark. Ideally we would be able to test the cells for 10 full years to determine this qualification, but that is not practical. Preliminary calendar life results at 30°C from our latest cells, suggest promising calendar life results. Envia continues testing and more data will be available to validate the calendar life models and life predictions. Conclusions and Future Directions In its first USABC project, Envia has been able to meet all of the energy and power goals without maximizing the energy of the cathode by operating between 2.2V and 4.35V. As a continuation of the work, Envia continues to be committed to meeting the aggressive USABC cell targets to enable widespread adoption of EVs. Recently, new more aggressive USABC targets for EVs were made public together with a request for proposal information (RFPI). In order to have a better chance to meet the targets, Envia will propose to integrate high capacity lithium-rich cathodes with high capacity silicon-based anodes. Only in this combination can the new aggressive cost and energy targets be met. During this proposal, Envia will also partner with leading silicon chemical companies, as well as with leading electrolyte, separator and pre-lithiation companies. Having the right partners during the development will increase the probability of meeting the technical targets and ensuring that the developed technology can be mass-produced and commercialized. FY 2013 Annual Progress Report 31 Energy Storage R&DPDF Image | Advanced Battery Development
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