Date/Time: 04-03-2018 - Tuesday - 05:00 PM - 07:00 PM
Mumukshu Patel1 Eunho Cha1 Ji Hoon Kang2 Yongju Jung2 Wonbong Choi1

1, University of North Texas, Denton, Texas, United States
2, KOREATECH, Cheonan-Si, , Korea (the Republic of)

Sulfur as a cathode material is a promising candidate for next generation Li-based batteries because of its high theoretical specific capacity of 1672 mAh/g and energy density of ~2600 Wh/kg. However, the intrinsic limitations associated with low conductivity of sulfur and instability of sulfur based composite hinders the commercial progress of lithium sulfur batteries. In the past 8 years of Li-S batteries research, there are lots of appreciable cathode design have been considered demonstrating excellent electrochemical performance. It has been mathematically calculated that even with high sulfur loading amount and effective sulfur utilization, the true value of energy density cannot outperform the currently available LIBs with the presence of excessive electrolyte. The amount of electrolyte also determines the electrochemical performance of Li-S cell in terms of sulfur utilization and cycling stability. However, the statistical analysis shows that more than 90% of reported publications have neglected this E/S ratio, which is important parameter for determining sulfur utilization and energy density of the cell. Here, we report a facile methodology to fabricate binder-free three-dimensional carbon nanotubes/sulfur hybrid composite with different sulfur loading amounts from 1 to 9 mg/cm2 while tuning the electrolyte/sulfur (E/S) ratio from 12 to 1. The results have demonstrated the E/S ratio of 7 (60 µL electrolyte to 8.5 mg cm-2 sulfur) with reversible specific capacity of ~1068 mAh g-1 at 0.1C rate (~1.4mA cm-2) for up to 150 cycles.

Meeting Program

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

PCC North, 300 Level, Exhibit Hall C-E