Exploring hierarchical FeS2/C composite nanotubes arrays as advanced cathode for lithium ion batteries.

Rational construction of advanced FeS 2 cathode is one of research hotspots, and of great importance for developing high-performance lithium ion batteries (LIBs). Herein we report a facile hydrolysis-sulfurization method for fabrication of FeS 2 /C nanotubes arrays with the help of sacrificial Co 2 (OH) 2 CO 3 nanowires template and glucose carbonization. Self-supported FeS 2 /C nanotubes consist of interconnected nanoburrs of 5–20 nm, and show hierarchical porous structure. The FeS 2 /C nanotubes arrays are demonstrated with enhanced cycling life and noticeable high-rate capability with capacities ranging from 735 mAh g −1 at 0.25 C to 482 mAh g −1 at 1.5 C, superior to those FeS 2 counterparts in the literature. The composite nanotubes arrays architecture plays positive roles in the electrochemical enhancement due to combined advantages of large electrode-electrolyte contact area, good strain accommodation, improved electrical conductivity, and enhanced structural stability. [ABSTRACT FROM AUTHOR]