In Situ Construction of CeO2-Incorporated Hybrid Covalent Organic Frameworks for Highly Efficient Lithium–Sulfur Batteries

Lithium–sulfur (Li-S) batteries with high energy density, environmental friendliness, and low cost have still suffered from the short cycle life due to the shuttle effect of the dissoluble polysulfide intermediates. In this work, a hybrid host comprising ceric dioxide (CeO2) and covalent organic frameworks (COFs) was developed for the sulfur cathode. The hybrid host of CeO2/COFs manifests strong interaction with the polysulfide. Moreover, the polar interface of CeO2 and the highly 2D ordered structure of COFs endow good electrochemically catalytic activity, which accelerates the redox reaction and restrains the shuttle effect. Owing to the chemical and physical adsorption surface, the hybrid host of CeO2/COFs demonstrates a high initial capacity (1384 mAh g–1) and low decay rate (0.1%) at 0.5C. Collectively, the in situ hybrid strategy has high potential in elevating the performance of Li-S batteries.