Freestanding Double-Layer MoO3/CNT@S Membrane: A Promising Flexible Cathode for Lithium–Sulfur Batteries

Abstract

Lithium-sulfur (Li-S) batteries have been regarded as a promising candidate of secondary batteries to satisfy the enormous demand for electric vehicles and energy storage applications. However, Li-S batteries still suffer from severe capacity fading due to the shuttle effect of lithium polysulfides. Here, we develop a freestanding double-layer MoO3/carbon [email protected] ([email protected]) membrane by hydrothermal and suction filtration strategy, without polymer binder and current collector substrate. [email protected] contains a polysulfide-blocking layer and an active-material layer. Except S content, the two layers have the same components and are integrated together, so there is no distinct interface between the two layers, which can facilitate ion and electron transport. As the result, the [email protected] cathode delivers promising capacity retention and rate capability. The hierarchical integrated design provides a new strategy for develop high performance flexible cathodes for Li-S batteries.