CoO/MoO3@Nitrogen-Doped carbon hollow heterostructures for efficient polysulfide immobilization and enhanced ion transport in Lithium-Sulfur batteries.

Using ZIF-67 as precursor, a bimetallic oxide heterostructure of CoO/MoO 3 @NC was synthesized, and the potential of its application as a modified separator material for lithium-sulfur batteries was explored. Furthermore, the CoO/MoO 3 @NC heterostructure exhibits advanced performance in lithium-sulfur batteries, thus paving the way for the design of novel lithium-sulfur battery separator materials. [Display omitted] • Hollow bimetallic oxide heterostructures CoO/MoO 3 @NC obtained by simple hydrothermal synthesis and calcination. • CoO/MoO 3 @NC consists of a bimetallic oxide heterostructure with an outer layer of capped carbon. The bimetallic oxide heterostructure provides more active sites for adsorption of polysulfides and the carbon coating significantly improves the electrical conductivity of the bimetallic oxide heterostructure. • The Li-S battery equipped with a CoO/MoO 3 @NC modified separator exhibits a high discharge capacity of 613 mAh g−1 at 1C and a capacity decay rate of 0.092% after 500 cycles at 0.5C. • The in-situ impedance test also reveals the remarkable role of CoO/MoO 3 @NC in adsorbing polysulfides and facilitating ion transport. Lithium-sulfur batteries (LSBs) have emerged as a promising energy storage system, but their practical application is hindered by the polysulfide shuttle effect and sluggish redox kinetics. To address these challenges, we have developed CoO/MoO 3 @nitrogen-doped carbon (CoO/MoO 3 @NC) hollow heterostructures based on porous ZIF-67 as separators in LSBs. CoO has a strong anchoring effect on polysulfides. The heterostructure formed after the introduction of MoO 3 increases the adsorption of polysulfides. The carbon coating outside the heterostructure improves the ion transmission efficiency of the battery, leading to enhanced electrochemical performance. The modified LSB demonstrates a low-capacity decay rate of 0.092% over 500 cycles at 0.5C, with a high discharge capacity of 613 mAh g−1 at 1C. This work presents a novel approach for the preparation of hollow heterostructure materials, aiming for high-performance LSBs. [ABSTRACT FROM AUTHOR]