Hierarchical Porous Carbon Nanotube Spheres for High-performance K-O2 Batteries

摘要

In view of the ever-growing pressure for green gas emissionreduction,there is an urgent need for renewable energysystems.Rechargeablealkali metal-oxygen batteries,especially lithium-oxygen(Li-o2)batteries,are deemed themost promising energy storage systems because of their highertheoretical energy density than that of current lithium-ionbatteries[1-5].