In this work, three-dimensionally porous spinel-type lithium manganese oxides were prepared by a phase-inversion technology using poly(methyl methacrylate) (PMMA) as the template and followed by annealing at a high temperature. The morphology was observed on scanning electron microscopy and transmission electron microscopy, and the crystal structure was determined from the X-ray diffraction pattern. Effect of Al-doping on the electrochemical properties of the product was studied by cyclic voltammetry and galvanostatic charge–discharge measurements. LiAl0.1Mn1.9O4 (LAMO) displays better rate and cycling capabilities than the pristine LiMn2O4 (LMO) at room temperature. It also exhibits an enhanced cycling performance at 55°C due to doping with Al. The results suggest that the obtained LAMO could develop into a promising cathode material for lithium-ion batteries.