Three-Dimensionally Reinforced Freestanding Cathode for High-Energy Room-Temperature Sodium-Sulfur Batteries.

摘要: Room-temperature sodium-sulfur (RT Na-S) battery cathodes suffer from poor conductivity, rapid dissolution of intermediate products, and potentially destructive volume change during cycling. The optimal way to minimize these problems could be a construction nanocomposite cathode scaffold combining different components selected for their particular functions. Here, we have combined the excellent electronic conductivity reduced graphene oxide, polysulfide adsorption ability ultrafine manganese oxide nanocrystals, ion/electron dissemination efficiency nanosized sulfur, outstanding mechanical stiffness good electrical Na alginate/polyaniline hybrid binder in single electrode heterostructure. At 0.2 A g-1, an RT Na-S containing freestanding delivers initial specific cap acity 631 mA h g-1. By delivering nominal discharge voltage 1.81 V, our batteries bestow high energy 737 W kg-1 at 2nd cycle 660 was retained after 50 cycles. effect amount electrolyte additive is also well demonstrated this study. fabrication process provides new approach tailor design preparation effective room-temperature batteries.