Sulfur-based compounds as alternative energy storage materials for lithium ion batteries
Wei-Nien Su1*, Gebregziabher Brhane Berhe1, Chen-Jui Huang2, Teklay Mezgebe Hagos1, Bing Joe Hwang2,3
1Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan
2Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
3National Synchrotron Radiation Research Center, Hsin-Chu, Taiwan
* Presenter:Wei-Nien Su,
Sulfur has been used as the cathode material for lithium-sulfur batteries due to its low cost, environmental friendliness, high theoretical specific capacity (1675 mAh g-1), and high energy density (2600 Wh kg-1). However, the dissolution of the polysulfide intermediates (Li2Sx, 4 < x < 8) during cycling causes the loss of active material, while the deposition of insoluble polysulfide and sulfide (e.g., Li2S/Li2S2) precipitates on the Li anode surface and the intrinsic insulating nature of sulfur cast concerns on the long cycle performance of the cell. In this presentation, I am showing some of our recent progress in mitigating the shuttling effect of polysulfides by designing nanostructured sulfur and carbon composites as the cathode. Further, a new battery configuration will be presented by combining two existing active materials, namely sulfurized carbon compound as the anode and commercial LiMn2O4 as the cathode. This new, low-cost cell has a higher specific capacity (1148 mAh g-1) and energy density (185 Wh kg-1) at 1 C-rate compared to standard lead-acid batteries, as a promising alternative solution for energy storage applications.

Keywords: non-aqueous sulfur battery, sulfurized carbon composite, high capacity, energy storage