• Journal of Electrochemical Science and Technology
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• v.11 no.1
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• pp.33-40
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• 2020

We present a new and facile design of a high-performance Li-S cell by integrating a Li₂S-impregnated glass fiber separator together with a common sulfur cathode. We find that a considerable amount of Li₂S is consumed amidst the first charge, and most of Li₂S disappears at the end of the second charge. During the charge process, additional sulfur material is formed and contributes to a significant enhancement of the discharge capacity (~1400 mAh/g), compared with a control cell (~1260 mAh/g) without Li₂S. Moreover, the Li₂S containing cell exhibits much higher cycling stability (a 31% increase from ~840 to ~1100 mAh/g in the 100th cycle) and rate capability (a 30% increase from ~580 to ~750 mAh/g at 2 C) than the control cell. Our results indicate that adopting Li₂S-containing separator is highly effective to improving the electrochemical performances of Li-S cells.