An all-biomaterials-based aqueous binder based on adsorption redox-mediated synergism for advanced lithium-sulfur batteries

The complex multistep electrochemical reactions of lithium polysul fides and the solid -liquid -solid phase transformation involved in the S 8 to Li 2 S reactions lead to slow redox kinetics in lithium -sulfur batteries (Li -S batteries). However, some targeted researches have proposed strategies requiring the introduction of signi ficant additional inactive components, which can seriously affect the energy density. Whereas polymer binders, proven to be effective in suppressing shuttle effects and constraining electrode volume expansion, also have promising potential in enhancing Li -S batteries redox kinetics. Herein, a novel aqueous polymer binder is prepared by convenient amidation reaction of fully biomaterials, utilizing its inherent rich amide groups for chemisorption and redox mediating ability of thiol groups to achieve adsorption redox-mediated synergism for ef ficient conversion of polysul fides. Li -S batteries based on N -Acetyl- L -Cysteine-Chitosan (NACCTS) binder exhibit high initial discharge specific capacity (1260.1 mAh g -1 at 0.2 C) and excellent cycling performance over 400 cycles (capacity decay rate of 0.018% per cycle). In addition, the batteries exhibit great areal capacity and stable capacity retention of 83.6% over 80 cycles even under high sulfur loading of 8.4 mg cm -2 . This work offers a novel perspective on the redox-mediated functional design and provides an environmentally friendly biomaterials-based aqueous binder for practical Li-S battery.