A mesoscopic form of the spinel LiMn2O4 has been synthesized and studied for its electrochemical performance as a lithium ion insertion host material and for its application in the electrode fabrication destined for rechargeable batteries. A theoretical model based on the sintering behavior of several commercial materials indicated the major importance of controlling the particle size and the morphology of the agglomerates with respect to power density and fast lithium intercalation in a prospective thin-layer battery system. Computational models were developed for complete mesoporous thin-layer cell simulation at steady state, providing insight to the requirements concerning the electrolyte function in the ＇rocking-chair＇ concept scale-up. A complete thin-layer battery was conceived and constructed which showed promising performance.