FeS2@C nanowires derived from organic-inorganic hybrid nanowires for high-rate and long-life lithium-ion batteries

Abstract

Abstract One-dimensional (1D) porous FeS2@C nanowires as a high cathode material for lithium-ion batteries (LIBs) are synthesized on a large-scale from an organic-inorganic hybrid nanowire precursor. The FeS2@C nanowires not only provide a continuous and fast electron transport pathway, favorable diffusion kinetics, but also provide the protection buffer the volume expansion and effectively prevent the polysulfides from dissolving in the electrolyte during cycling. Attributing to the synergistic advantages of both 1D porous nanostructure and the encapsulation of thin amorphous carbon layers, the FeS2@C nanowires exhibit remarkable lithium storage performance with a high specific capacity of 889 mA h g−1 at 0.1 A g−1 and 521 mA h g−1 at 10 A g−1. Moreover, a discharge energy density of 1225 Wh kg−1 is obtained at 2 A g−1 and remains as high as 637 Wh kg−1 after 1000 cycles, which is even higher than the LiCoO2 cathode. The results demonstrate that the potential for applications in LIBs with high power density and long cycling life.