Carbon Nanotubes Loaded with Fe3o4 Quantum Dots Modified Lithium Sulfur Battery Separator with Ivy Shaped Structure

Abstract

This study proposes a solution is proposed to design an ivy stem and leaf shaped interwoven structure multi-walled carbon nanotube loaded iron oxide quantum dot as highly catalytic separator for Li-S batteries. This membrane not only can demonstrate dual functionality by effectively trapping lithium polysulfides while simultaneously enhancing their catalytic conversion kinetics, but also construct fast electron transfer channels for rapid charge transfer process. The modified separators demonstrate excellent electrochemical performance, demonstrating a high initial capacity of 1500 mAh g⁻¹ at 0.2 C and superior rate capability up to 3 C, outperforming conventional sulfur composites (typically <1200 mAh g-1 at 0.2 C), and long-term performance at 1 C over 500 cycles.

Keywords: lithium-sulfur batteries, lithium polysulfides, catalytic conversion, shuttle effect, interwoven structure