Sustainable Performance of Li-S Battery Using Ultramicroporous Carbon-Sulphur Composite Electrode in Carbonate Based Electrolyte
Herein, we report an easily scalable, inexpensive ultramicroporous carbon confined sulphur composite cathode and its sustainable performance in Li-S cell using commercial carbonate based electrolyte. The ultramicroporous carbon sulphur (UC-S) composite with a sulphur loading of 46 % exhibits a reversible capacity of 700 mAh g-1 at C/5 (335 mA g-1) even after 100 cycles (Figure 1). The observed cycling stability was attributed to the direct formation of low order polysulphides (Li2S2/ Li2S) during the discharge process of UC-S cathode. For the first time we have examined and validated the lithiation/delithiation mechanism and the mechanism of capacity fading over cycling for sulphur confined in microporous carbon cathode by analysing the subsurface using XPS.
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