All-solid-state lithium battery with sulfur/carbon composites as positive electrode materials

Sulfur-carbon composites were investigated as positive electrode materials for all-solid-state lithium ion batteries with an inorganic solid electrolyte (amorphous Li3PS4). The elemental sulfur was mixed with Vapor-Grown Carbon Fiber (VGCF) and with the solid electrolyte (amorphous Li3PS4) by using high-energy ball-milling process. The obtained sulfur-VGVF-solid electrolyte composite was used as positive electrode materials of the all-solid-state battery. The composite showed good electrochemical properties as positive electrode materials. The capacity that was calculated on the base of the weight of sulfur was about 1300 mAhg− 1 at room temperature, when the all-solid-state battery was discharged and charged in the voltage range of 0.9 to 2.6 V at a constant current density of 0.1 mAcm− 2. The battery kept the capacity more than 1200 mAhg− 1 even after 50 discharge-charge cycles.