Lithium-sulfur (Li/S) batteries are among the most promising next-generation energy storage systems because of their high theoretical specific energy of ~2600 Wh/kg. However, conventional Li/S batteries require high amounts of redox inactive liquid electrolytes, which do not contribute to cell capacity. Thus, the practical specific energy of Li/S batteries is often relatively poor (&lt;500 Wh/kg) and barely competitive with Li-ion batteries. Here, we present a new hybrid Li/S battery that contains both a liquid and a solid cathode, i.,e. dimethyl trisulfide (DMTS) and fibrous sulfurized poly(acrylonitrile) (SPAN) as active materials.&lt;span style="font-size:10.8333px"&gt; &lt;/span&gt;These Li/DMTS/SPAN cells exhibit high capacity (formally, when referring solely to the sulfur in the cathode, up to 7100 mA.h/gsulfur of cathode), high areal capacity up to 4.3 mA.h.cm-2, high rate capability up to 8 C and excellent cycle stability (&gt;700 cycles). In addition, both the working and aging mechanism has been elucidated by NMR, Raman, X-ray photoelectron and electronic impedance spectroscopy, X-ray powder diffraction, cyclic voltammetry, and post-mortem analysis. Both in the absence and presence of DMTS, he working and aging mechanisms differ substantially from sulfur@carbon cathodes. A detailed outline will be presented.

High capacity, highly reversible lithium-sulfur batteries based on fibrous sulfur/poly(acrylonitrile) cathodes and a catholyte

256th National Meeting (2018)

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