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A Robust Glass Fiber Based Free Standing Composite Electrode for Lithium-Polysulfide Batteries

Wednesday, 4 October 2017: 18:10
Maryland A (Gaylord National Resort and Convention Center)
P. Ragupathy (Korea Advanced Institute of Science and Technology), S. Abdul Ahad, H. W. Lee (UNIST), and D. K. Kim (Korea Advanced Institute of Science and Technology)
Lithium-sulfur batteries are attractive energy storage devices for the next generation of rechargeable storage technology in the sector of electric mobility and renewable energy systems. However, the poor electronic conductivity of sulfur, low active materials utilization, dissolution of polysulfide and limited sulfur loading hinders its commercial implementation for practical applications. Herein, we report a flexible glass fiber based free standing electrode (FSE) in lithium-polysulfide batteries with high energy density and long cycle life. The specially designed electrode provides enough space to accommodate large amount of sulfur and facilitate the enhanced immobilization of polysulfide ions. Moreover, MnO2 inbuilt in the electrode favors in suppressing the polysulfide shuttling effect. The initial specific capacity of Li-polysufide (Li2S8) in FSE is 1275 mAhg-1 at 0.2 C with remarkable capacity retention upon cycling. A complete physico-chemical characterization and the electrochemical behavior of free standing electrode will be discussed in detail.