A Hybrid Dual-Type Sulfur Cathode and a Lithiated Si/SiOx Nanosphere Anode for Li-Sulfur Full Cells

Thursday, October 15, 2015: 11:20
102-C (Phoenix Convention Center)
S. K. Lee (Hanyang University), E. Park (Hanyang University), B. Scrosati (Istituto Italiano di Tecnologia, Genova, Italy), J. Hassoun (Sapienza University of Rome), M. S. Park (Korea Electronics Technology Institute), Y. J. Kim (Korea Electronics Technology Institute), H. Kim, I. Belharouak (Qatar Environment and Energy Research Institute), and Y. K. Sun (Hanyang University)
Lithium−sulfur batteries could become an excellent alternative to replace the currently used lithium-ion batteries. 1 The natural abundance and low cost of sulfur, coupled with the high theoretical energy density of sulfur-based cathodes, namely, 1675 mAh g-1 and 2600 Wh kg-1, are the major advantages of this sulfur battery.2 However, commercialization of lithium−sulfur batteries has so far been limited due to the cyclability problems associated with both the sulfur cathode and the lithium−metal anode.3 Herein, we demonstrate a highly reliable lithium−sulfur battery showing cycle performance comparable to that of lithium-ion batteries; our design uses a highly reversible hybrid dual-type sulfur cathode (solid sulfur electrode and polysulfide catholyte) and a lithiated Si/SiOx nanosphere anode. Our result shows superior battery performance in terms of high specific capacity, excellent charge−discharge efficiency, and notable cycle life, delivering a specific capacity of ∼750 mAh g−1 over 500 cycles (85% of the initial capacity). These promising behaviors may arise from a synergistic effect of the enhanced electrochemical performance of the newly designed anode and the optimized layout of the cathode.


1. B. Scrosati, J. Hassoun, Y-K. Sun, Energy Environ. Sci., 4, 3287 (2011).

2. E. Peled, A. Gorenshtein, M. Segal, Y. Sternberg, J. Power Sources, 26, 269 (1989).

3. Y-V. Mikhaylik, J. R. Akridge, J. Electrochem. Soc., 151, A1969 (2004).