Porous 0.2Li2MnO3·0.8LiNi0.5Mn0.5O2 nanorods as cathode materials for lithium-ion batteries

Abstract

Porous 0.2Li₂MnO₃·0.8LiNi_0.5Mn_0.5O₂ nanorods (LLNMO PNRs) assembled with nanoparticles have been prepared and investigated as cathode materials for rechargeable lithium-ion batteries. The LLNMO PNRs were obtained through solid-state Li and Ni implantation of porous Mn₂O₃ nanowires. Without surface modification, the as synthesized LLNMO PNRs exhibited superior capacity and rate capability to the counterpart bulk samples. An initial discharge capacity of 275 mA h g⁻¹ could be delivered at 0.2 C rates, with about 90% capacity retention after 100 cycles. The remarkable performance was attributed to the porous 1D nanostructures that could buffer against the local volume change and shorten the Li-ion diffusion distance.