Powder comprising multiple porous graphene balls as a cathode active material for an alkali metal-sulfur battery, wherein a graphene balls has a diameter from 100 nm to 20 μm and comprises (i) pores and pore walls therein and (ii) sulfur or metal polysulf...

Provided are a powder mass and a production process, the powder mass comprising multiple porous graphene balls for use in a lithium-ion or sodium-ion battery, wherein at least one of the graphene balls has a diameter from 100 nm to 20 μm and comprises (i)...