Status and Prospects of MXene-Based Lithium-Sulfur Batteries

Lithium-sulfur (Li-S) batteries with a theoretical energy density of 2567 Wh kg(-1) are very promising next-generation energy storage systems, but suffer from the insulativity of sulfur and Li2S, the shuttle effect due to the dissolution and migration of polysulfides, and the lithium dendrite issue. MXenes, a family of 2D transition metal carbides/nitrides, which have metallic conductivity, structural variety, strong chemical adsorption ability to polysulfides, effective catalytic effect for fast kinetics, and inducing effect for uniform growth of Li, exhibit promising potential for high-performance Li-S batteries. In this review, the recent progress and achievements of MXene-based Li-S batteries are summarized, including the use of MXenes in sulfur cathode, interlayer between cathode and separator, and Li anode. The architecture construction and chemical modification of MXenes, as well as hybridization with other materials are demonstrated. The enhancement on electrochemical performance and the related mechanisms of MXenes and MXene-based composites are discussed. Finally, challenges and perspectives of MXenes for Li-S battery application are also given.

Automated summary

MXenes, with their metallic conductivity, strong chemical adsorption ability to polysulfides, and effective catalytic effect, show promising potential for high-performance Li-S batteries. Their use in sulfur cathode, interlayer between cathode and separator, and Li anode can enhance electrochemical performance and address challenges in Li-S battery application.