Status and Prospects of High-Entropy Materials for Lithium–Sulfur Batteries

Abstract

The emergence of various electronic devices and equipment such as electric vehicles and drones requires higher energy density energy storage devices. Lithium-sulfur batteries (LSBs) are considered as the most promising new generation energy storage system owing to high theoretical specific capacity and energy density. However, the severe shuttle behaviors of soluble lithium polysulfides (LiPSs) and the slow redox kinetics lead to low sulfur utilization and poor cycling stability, which seriously hinder the commercial application of LSBs. Therefore, various catalytic materials have been employed to solve these troublesome problems. High entropy materials (HEMs), as advanced materials, can provide unique surface and electronic structures that expose plentiful catalytic active sites, which opens new ideas for the regulation of LiPSs redox kinetics. Notwithstanding many instructive reviews in the land of LSBs, while this review aims to offer a complete and shrewd summary of the current progresses in HEMs-based LSBs, including in-depth interpretation of design principles and mechanistic electrocatalysis functions as well as pragmatic perspectives.

Working Principles of High-Entropy Electrolytes in Rechargeable Batteries

“…HEMs with abundant exposing catalytic active sites can also provide unique surface and electronic structures to regulate the redox kinetics of soluble Li polysulfides in Li-sulfur batteries. 48 HEMs can make a stable layer structure on the anode of Na battery, effectively inhibiting the phase transition to improve the battery cycle stability. 49 Lun et al designed a high-entropy cathode material with a cationic disordered rock salt-type structure, rendering a high capacity of more than 170 mAh g −1 at a high rate of 2000 mA g −1 .…”