▎ 摘　　要

Lithium-sulfur (Li-S) batteries have been recognized as one of the most promising lithium-ion power sources. However, their commercial application is greatly hindered by the incompletely used active materials and unsatisfactory cyclability. Herein, a novel well-honeycombed porous graphene framework (3D-G) was developed using a PMMA-sphere-assisted vacuum filtration method, and used as an advanced sulfur host for enhancing Li-S battery performance. The unique well-honeycombed porous graphene framework not only enhances the electronic conductivity of Li-S cathodes, but also provides numerous active sites for sulfur adsorption. Moreover, the ultrafine sulfur uniformly embedded into the well-honeycombed porous graphene framework increases the utilization of active materials. Benefiting from these synergistic features, 3D-G/S cathodes exhibit excellent electrochemical performance, such as long-cycling stability with a ultra-low capacity fading of 0.099% per cycle over 200 cycles at a high current density, holding great promise for development of practically viable Li-S batteries. (C) 2020 Elsevier B.V. All rights reserved.