Sulfur vulcanization

Simple and easy low cost synthesis path for the active cathode product in Li-S electric battery.

Use of copolymer as sulfur and divinylbenzene in Li-S cells.

Great extremely long-lasting cycling performace of Li-S cells at high C/2 prices.

Lithium-Sulfur (Li-S) battery pack technology is just one of the encouraging applicants for next generation power storage systems. Many studies have actually centered on the cathode materials to enhance the cell performance. In this work we present a series of poly (S-DVB) copolymers synthesised by inverse vulcanization of sulfur with divinylbenzene (DVB). The poly (S-DVB) cathode shows exemplary cycling activities at C/2 and C/4 present rates, respectively. It had been demonstrated poly (S-DVB) copolymer containing 20% DVB did not affect the electrochemical overall performance for the sulfur product, in comparison to elemental sulfur as large certain capacities over ∼700 mAh g−1 at 500 cycles were accomplished at C/4 present rate, much like main-stream carbon-based S cathodes. But employing copolymer network is thought to do something firstly as sulfur reservoir and secondly as mechanical stabilizer, improving dramatically the cycling lifetime. The Li-poly (S-DVB) mobile demonstrated an exceptionally low degradation price of 0.04% per cycle achieving over 1600 cycles at C/2 existing rate.

Keywords

• Sulphur;
• Divinylbenzene;
• Crosslinking;
• Copolymer;
• Cathode materials;
• Lithium-sulphur batteries