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III.A.9 Multifunctional, Inorganic-Filled Separator Halalay – USABC, Pekala – ENTEK makers who will test silica filled separators in large format batteries in order to determine the commercial viability of this technology. Approach ENTEK will: Deliver a quantity of 18650 cells with silica filled separator and control cells with unfilled polyolefin separator to USABC for testing by DOE labs. Extrude and biaxially orient additional films filled with the preferred spray dried and jet milled silica to improve dispersion. An ample quantity of separator will be prepared to serve as inventory for samples needs. Results Deliverables. In October 2013, a set of 18650 cells were shipped to INL and Sandia for abuse testing, as shown in Table III - 9. Table III - 9: A summary of 18650 cells shipped for abuse testing Cell Testing. 60°C Calendar Life Test. Figure III - 37 shows OCV vs. days on storage for 18650 cells made with densified silica filled separator. The control cells are off test after 28 weeks at 60°C. Three cells with densified SFS are still on test at 60°C after 69 weeks. Figure III - 37: 18650 cells with silica-filled separators Figure III - 38 below compares standard capacity (30°C) fade for 18650 cells made with silica filled separator and a tri-layer polyolefin separator both stored at 60°C. Figure III - 38: Standard capacity fade 60°C storage test Conclusions and Future Directions Based on a limited amount of testing, abuse tolerance of cells made with silica filled separators is as good as cells made with an unfilled polyolefin separator; while cycle life, self-discharge and low temperature performance of silica filled cells is significantly better than unfilled controls The improvement in cell performance for cells with silica- filled separators was unexpected and has potential advantages for new cell designs and applications. Control cells SFS cells INL 23 20 Sandia 12 10 Total 35 30 Energy Storage R&D 62 FY 2013 Annual Progress ReportPDF Image | Advanced Battery Development
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