Porous Hollow Superlattice NiMn₂O₄/NiCo₂O₄ Mesocrystals as a Highly Reversible Anode Material for Lithium-Ion Batteries.

ABSTRACT: As a promising high-capacity anode material for Li-ion batteries, NiMn₂O₄ always suffers from the poor intrinsic conductivity and the architectural collapse originating from the volume expansion during cycle. Herein, a combined structure and architecture modulation is proposed to tackle concurrently the two handicaps, via a facile and well-controlled solvothermal approach to synthesize NiMn₂O₄/NiCo₂O₄ mesocrystals with superlattice structure and hollow multi-porous architecture. It is demonstrated that the obtained NiCo_1.5Mn_0.5O₄ sample is made up of a new mixed-phase NiMn₂O₄/NiCo₂O₄ compound system, with a high charge capacity of 532.2 mAh g^-1 with 90.4% capacity retention after 100 cycles at a current density of 1 A g^-1. The enhanced electrochemical performance can be attributed to the synergistic effects of the superlattice structure and the hollow multi-porous architecture of the NiMn₂O₄/NiCo₂O₄ compound. The superlattice structure can improve ionic conductivity to enhance charge transport kinetics of the bulk material, while the hollow multi-porous architecture can provide enough void spaces to alleviate the architectural change during cycling, and shorten the lithium ions diffusion and electron-transportation distances.

SUBMITTER: Li L 

PROVIDER: S-EPMC5962773 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature