EN06.04.09 : The Effect of Calendering Temperature for Sulfur Electrodes Used for Large-Scale Lithium-Ion Batteries

5:00 PM–7:00 PM Apr 3, 2018 (America - Denver)

PCC North, 300 Level, Exhibit Hall C-E

Rachel Ye1 Jeffrey Bell1 Daisy Patino1 Mihri Ozkan1 Cengiz Ozkan1

1, University of California, Riverside, Riverside, California, United States

Current commercial lithium-ion batteries have reached their capacity limit due to the materials in use. To improve the capacity of lithium-ion batteries, researchers have started to use new electrode materials such as sulfur and silicon. Sulfur, although being a high capacity cathode material, suffers from conductivity and expansion problems. To increase the conductivity of sulfur electrodes, a high percentage of carbon is usually added to the electrode, resulting in low sulfur loading. A common method to improve the conductivity and the sulfur loading of an electrode is to calendar or densify the electrode, resulting in a more intimate contact between active material and the conductive additive. Herein we look at the positive effects of calendaring sulfur electrodes at different temperatures, varying from room temperature to as high as 120C. By elevating the electrode temperature, the heat softens the sulfur, allowing the sulfur particles to better come into contact with the conductive network and improving the conductive network. The increase in calendar temperature increases cycle life, capacity, and rate capability of the lithium-sulfur battery.