Developing Emulsion-Templated Silicon/Carbon Anodes with Reduced Graphene Oxide for Lithium Ion Batteries

Wednesday, October 14, 2015: 16:30
213-B (Phoenix Convention Center)
Y. Zhang, Y. Pan, Y. Chen, C. Chen, B. L. Lucht (University of Rhode Island), and A. Bose (University of Rhode Island)
Silicon (Si) is considered as one of the most promising candidates for next-generation lithium ion battery anodes owing to its superior theoretical capacity. However, Si suffers from a dramatic volume change during lithiation and delithiation, leading to pulverization and capacity decay. We report a simple oil-in-water emulsion-templating method to successfully fabricate high capacity and stable silicon/carbon anodes by directing Si and carbon to desired spatial locations. Because carbon does not contribute to capacity, we minimize the total amount of carbon in our anodes by using a mixture of carbon black (CB) and reduced graphene oxide (RGO) as the conducting phase. The low percolation threshold of the RGO reduces the anode impedance effectively. With 1 wt% RGO, the electrochemical half-cell tests using this structured Si/CB/RGO anodes show great improvements of capacity and retention after 50 cycles at a cycle rate of C/5 compared to the Si/CB control anodes. Emulsion-templating is a scalable colloidal principle based method for forming electrodes for rechargeable batteries.