Hybrid NiCo2O4-NiCo2S4 Nanoflakes as High-Performance Anode Materials for Lithium-Ion Batteries

摘要

The hybrid electrode with the combination of NiCo2O4 of inverse spinel structure and more conducting NiCo2S4 of normal spinel structure has been developed for next generation Li-ion batteries. The hybrid nanostructures with the accessibility of both NiCo2O4 as well as NiCo2S4 showed almost 2-fold better performance compared to pristine NiCo2O4. Apart from the doubled performance for hybrid materials, a significant cycling stability with 91.6% coulombic efficiency was achieved over 200 cycles. Such a high storage performance for the hybrid materials can be attributed not only to their normal spinel/ inverse spinel combination, but also to the binder-free direct deposition of materials on to the conductive 3D open Ni-frame resulting high electrical conductivity and easy ionic diffusion.