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/cm2) exhibited a superior cell‐level energy density of 588.8 Wh kg−1.
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