3D Ordered Macroporous MoO2 Attached on Carbonized Cloth for High Performance Free-Standing Binder-Free Lithium-Sulfur Electrodes

Lithium-sulfur (Li-S) batteries have received increasing attention due to their high energy density. However, it is still challenging to inhibit the diffusion of polysulfide and achieve high sulfur utilization. Herein, we designed and prepared a free-standing and binder-free electrode for high-performance Li-S batteries by in situ growth of 3D ordered macroporous MoO2 on carbonized nonwoven cloth (MoO2/CC). After the uptake of Li2S6, the obtained MoO2/CC-Li2S6 electrode with high sulfur loading of 3.26 mg cm-2 delivers a large discharge capacity of 1267 mA h g-1 at 0.1 C. A high discharge capacity of 621 mA h g-1 is still retained after 500 cycles at 2 C. The excellent electrochemical performance of this MoO2/CC-Li2S6 electrode is attributed to the unique nanostructure and strong chemical interaction between MoO2 and polysulfides. The 3DOM MoO2 not only guarantees the high loading of sulfur but also suppresses the diffusion of polysulfides. The carbonized nonwoven cloth (CC) functions as the basic support for the 3DOM MoO2, increasing the electronic conductivity and mechanical property of the free-standing electrodes. This work provides a feasible strategy for the construction of high-performance free-standing binder-free Li-S electrodes.