Carbon nanofiber-supported B2O3–SnOx glasses as anode materials for high-performance lithium-ion batteries†
Abstract
A series of carbon nanofiber-supported B2O3–SnOx glasses (0B2O3–SnOx/CNFs, 0.5B2O3–SnOx/CNFs, 1.5B2O3–SnOx/CNFs and 3B2O3–SnOx/CNFs) have been prepared by an electrospinning technique, and a subsequent stabilization and carbonization treatment. The amorphous B2O3–SnOx glass nanoparticles homogeneously dispersed in the carbon nanofibers (CNFs) matrix have been utilized as anode materials for lithium-ion batteries. The typical 1.5B2O3–SnOx/CNF nano hybrid anode material demonstrates the highest reversible capacity as well as superior cycling stability and rate performance by virtue of the special glass network structure of non-bridging oxygen (NBO: B–O⋯Sn) in the B2O3–SnOx glasses, which can not only buffer the large volume change of SnOx, but also prohibit the aggregation of Sn nanoparticles during the charge–discharge cycles.