Synthesis and Characterization of Cardanol-based Surfactant and its Application as Cathode Coating Material for Lithium-Sulfur Batteries
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Lithium-sulfur battery has attracted tremendous attention of global energy industry because of its huge theoretical capacity and energy density. However, its commercialization is hindered by the continuous capacity fading during charge and discharge process, which is originated from the shuttling of lithium polysulfides. Herein, cardanol-based surfactant was synthesized, coated on the surface of the cathode, and crosslinked to suppress the leakage of lithium polysulfides. The modification and crosslinking of cardanol was confirmed by the 1H NMR analysis. Our lithium-sulfur cell with 0.5 wt% surfactant-coated cathode displayed discharge capacity of 600 mAh g-1 after 100 cycles at 0.5 C with enhanced initial discharge capacity retention. This work offers a feasible and simple strategy to apply cardanol, a renewable and biobased material as an eco-friendly coating material for lithium-sulfur battery cathodes.