Anthraquinone Covalent Organic Framework Hollow Tubes as Binder Microadditives in Li-S Batteries

The exploration of new application forms of covalent organic frameworks (COFs) in Li-S batteries that can overcome drawbacks like low conductivity or high loading when typically applied as sulfur host materials (mostly approximate to 20 to approximate to 40 wt % loading in cathode) is desirable to maximize their low-density advantage to obtain lightweight, portable, or high-energy-density devices. Here, we establish that COFs could have implications as microadditives of binders ( approximate to 1 wt % in cathode), and a series of anthraquinone-COF based hollow tubes have been prepared as model microadditives. The microadditives can strengthen the basic properties of the binder and spontaneously immobilize and catalytically convert lithium polysulfides, as proved by density functional calculations, thus showing almost doubly enhanced reversible capacity compared with that of the bare electrode.

Automated summary

The potential of COFs as microadditives has been demonstrated to overcome drawbacks when traditionally applied in Li-S batteries, enhancing reversible capacity.