High-Rate Performance All-Solid-State Li-SeS2 Battery with Selenium sulphide/three-dimensional graphene as cathode material

Selenium sulfide (SeS 2 ) shows attractive advantages of high capacity for lithium storage. Here, a free-standing ultra-high dispersion Selenium sulfide three-dimensional graphene (SeS 2 -3DG) was synthesized and used as a cathode material in all-solid-state Lithium-Selenium sulfide (Li-SeS 2 ) batteries for enhancing rate performance and utilization of SeS 2 . SeS 2 -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 SeS 2 -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 SeS 2 , charge and discharge products of Li-SeS 2 batteries were observed by high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED). The mechanism of lithium sulfide (Li 2 S)/ Lithium selenide (Li 2 Se) ↔ SeS 2 was confirmed.