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

Abstract The hybrid electrode with the combination of NiCo 2 O 4 of inverse spinel structure and more conducting NiCo 2 S 4 of normal spinel structure has been developed for next generation Li‐ion batteries. The hybrid nanostructures with the accessibility of both NiCo 2 O 4 as well as NiCo 2 S 4 showed almost 2‐fold better performance compared to pristine NiCo 2 O 4 . 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.