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Cardanol benzoxazine-Sulfur Copolymers for Li-S batteries: Symbiosis of Sustainability and Performance
Shukla S., Ghosh A., Sen U.K., Roy P.K., Mitra S.,
Published in Wiley-Blackwell
Volume: 1
Issue: 3
Pages: 594 - 600
A sulfur-rich copolymer is synthesized via a sustainable, eco-friendly approach using two major wastes namely, elemental sulfur (industrial waste) and cardanol (agro waste) and its application as cathode active material in Li−S battery. The presence of chemically bound sulfur (90 wt\%) utilising cardanol (10 wt\%) derivative in the copolymer (S90) showed a reduction in the active material dissolution into the electrolyte. In addition, the organic sulfur units get dispersed into the insoluble/insulating Li2S2/Li2S phase and thus found to suppress their irreversible deposition. Li−S battery based on S90/multi-walled carbon nanotubes (MWCNT) (10 wt\%) exhibited a reversible capacity of 1302 mAh g−1 at 2nd cycle, maintaining a high reversible capacity of 928 mAh g−1 after 70 cycles at a relatively constant coulombic efficiency over 99 \% at current rate of 200 mA g−1. At 1000 mA g−1 current rate, the composite cathode delivered a reversible capacity of 697 mAh g−1 at 2nd cycle and retained 75 \% of its initial capacity even after 180 cycles. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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Published in Wiley-Blackwell
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