A LONG-LIFE, HIGH RATE LITHIUM/SULFUR CELL UTILIZING A HOLISTIC APPROACH TO ENHANCING CELL PERFORMANCE

摘要

A long-life, high-rate lithium sulfur (Li/S ) cell with high specific energy uniquely combines cetyltrimethyl ammonium bromide (CTAB) -modified sulfur- graphene oxide (S-GO) nanocomposites with an elastomeric styrene butadiene rubber (SBR)/ carboxy methyl cellulose (CMC) binder and an ionic liquid-based novel electrolyte with the L1NO3 additive. A Li/S cell employing a CTAB-modified S-GO nanocomposite cathode can be discharged at rates as high as 6C (1C = 1.675 A/g of sulfur) and charged at rates as high as 3C while still maintaining high specific capacity (-800 mAh/g of sulfur at 6C), with a long cycle life exceeding 1500 cycles, the longest cycle life with extremely low decay rate (0.039% per cycle) demonstrated so far for a Li/S cell.