Fe-carbon hybrid composite interlayer for improved electrochemical performance of Li-S battery

The major bottlenecks in achieving the full potential of Lithium-sulfur (Li-S) batteries are the insulating nature of sulfur and Li-polysulfide (Li-PS) shuttling which lead to their poor rate performance and cyclic stability. In this work, we solve these critical issues using a unique Fe-carbon hybrid composite inter layer prepared by the catalytic graphitization of resorcinol formaldehyde (RF) xerogel. The physicochemical characterizations of the interlayer material reveal that it consists of iron-nanoparticles encapsulated by graphitic carbon within the amorphous RF xerogel derived hard carbon matrix (Fe-G-HC-IL). The Li-S battery, with Fe-G-HC-IL as a functional separator and activated candle soot-sulfur composite cathode, demonstrates a significantly improved electrochemical performance than without the interlayer. The Li-S battery with Fe-G-HC-IL shows the capacity of 1057 mAh g(-1) at 1 C-rate with a decay rate of 0.055% per cycle and excellent rate capability. Further, density functional theory (DFT) calculation indicates that the Fe embedded carbon structure present in interlayer composite contributes significantly to the improvement in the conductivity and minimization of Li-PS shuttling. Additionally, this Fe-carbon hybrid structure electro catalyzes the conversion of Li-PS to desired end products of the redox reactions which further enhance the electrochemical performance of Li-S batteries. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The research addresses the major bottleneck in Lithium-sulfur batteries by using Fe-carbon hybrid composite inter layers to improve the rate performance and cyclic stability. The Fe-G-HC-IL separator significantly enhances the electrochemical performance of the Li-S batteries, demonstrating improved capacity, decay rate, and rate capability. The Fe-carbon hybrid structure not only enhances conductivity and minimizes Li-PS shuttling, but also catalyzes the conversion of Li-PS to improve the overall electrochemical performance of the batteries.