▎ 摘　　要

Selenium sulfide (SeS2) shows attractive advantages of high capacity for lithium storage. Here, a free-standing ultra-high dispersion Selenium sulfide three-dimensional graphene (SeS2-3DG) was synthesized and used as a cathode material in all-solid-state Lithium-Selenium sulfide (Li-SeS2) batteries for enhancing rate performance and utilization of SeS2. SeS2-3DG achieved the utilization rate of 103% with capacity of 1,163 mAh g(-1) and remained 538.56 mAh g(-1) after 20 cycles under 1/2C. It should be noted that SeS2-3DG exhibited outstanding rate performance, which discharged under 7C with capacity as high as 990 mAh g(-1). Due to the high utilization rate of SeS2, charge and discharge products of Li-SeS2 batteries were observed by high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED). The mechanism of lithium sulfide (Li2S)/ Lithium selenide (Li2Se) <-> SeS2 was confirmed.