Highly Ordered Mesoporous NiCo2O4 as a High Performance Anode Material for Li-Ion Batteries

Abstract

The controlled synthesis of highly ordered mesoporous structure has attracted considerable attention in the field of electrochemistry because of its high specific surface area which can contribute the transportation of ions. Herein, a general nano-casting approach is proposed for synthesizing highly ordered mesoporous NiCo₂O₄ microspheres. The as-synthesized mesoporous NiCo₂O₄ microsphere materials with high Brunner-Emmett-Teller (BET) surface area (~97.77 m²g^-1) and uniform pore size distribution around 4 nm exhibited a high initial discharge capacity of ~1,467 mAhg^-1, a good rate capability as well as cycling stability. The superior electrochemical performance was mainly because of the highly porous nature of NiCo₂O₄, which rendered volume expansion during the process of cycling and shortened lithium-ions transport pathways. These properties showcase the inherent potential for use of highly ordered mesoporous NiCo₂O₄ microspheres as a potential anode material for lithium-ion batteries in the future.