Interfacial charge-transfer enhances the dual-function of the porous NiCo2S4@SiO2 heterojunction for high-performance Li–S batteries

Abstract

Porous NiCo₂S₄@SiO₂ is employed as the sulfur host. The negatively charged SiO₂ can increase the charge density and conductivity of NiCo₂S₄ and accelerate the conversion of sulfur. The charge transfer effect would in turn reduce the electrostatic repulsion between SiO₂ and negatively charged polysulfide, thereby enhancing the adsorption of polysulfides.