▎ 摘　　要

In this study, we prepared a free-standing ultra-high dispersion sulfur three-dimensional graphene (S-3DG) foam by a simple in-situ synthesis method. The HRTEM and SAED test of the discharged and charged products showed reversible conversion of Li2S and S during cycling. All-solid-state Li-S batteries with 55% sulfur content can reach initial discharge capacity of 1680 mAh g(-1)at 1/16 C and 410 mAh g(-1)at 4 C. And the capacity was about 450 mAh g(-1)after 20 times cycling tested at 1/8 C. Moreover, Li-S batteries with 80% sulfur loading (8 mg/cm(2)) exhibited a superior cell-level energy density of 588.8 Wh kg(-1).