When 3:30 PM - 5:00 PM Jan 11, 2013
Where 1670 CSE Building
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Nanoscale Interface Engineering for Improved Li-ion Batteries

Sehee Lee
Department of Mechanical Engineering, University of Colorado

Significant advances in energy density, rate capability and safety will be required for the implementation of Li-ion batteries in plug-in electric vehicles. We have demonstrated atomic layer deposition (ALD) as a promising method to enable superior cycling performance for a vast variety of battery electrodes. The electrodes range from already demonstrated commercial technologies (cycled under extreme conditions) to new materials that could eventually lead to batteries with higher energy densities. For example, an Al2O3 ALD coating with a thickness of ~ 8 Å was able to stabilize the cycling of unexplored MoO3 nanoparticle anodes with a high volume expansion1. Recently, we coated a separator and enabled stable cycling in a high dielectric electrolyte that could better enable exploratory electrode materials2. Also, reduced thermal shrinkage was observed that could lead to improved safety for large vehicular battery packs. These results will be presented in detail.

(1) Riley, L. A.; Cavanagh, A. S.; George, S. M.; Jung, Y. S.; Yan, Y. F.; Lee, S. H.; Dillon, A. C. ChemPhysChem 2010, 11, 2124; Riley, L. A.; Lee, S. H.; Gedvilias, L.; Dillon, A. C. Journal of Power Sources 2010, 195, 588. (2) Jung Y, Cavanagh A, Gedvilas L, Widjonarko N, Scott I, Lee S, Kim G, George S, and Dillon A, Adv. Energy. Mater 2012, 2, 1022.

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