The overall aim of this project is to develop a state-of-the-art, scalable method to convert our excessive amounts of plastic waste (water bottles, shopping bags, etc.) into useful, value-added porous carbon materials (PCMs) which will be used as electrodes for advanced lithium-sulfur (Li–S) batteries. This is the first time that carbons derived from plastics will be used as cathode materials for Li–S batteries. The possibility of producing sustainable, useful carbon nanostructures from materials that are currently destined for incineration or landfills represents an exciting, promising route for waste reduction and the adaptation of a circular economy for plastics. Utilizing PCMs in Li–S batteries will concurrently address two of the most pressing global issues of today, plastic waste management and energy storage.