Ultrafast\nDischargeable LiMn₂O₄ Thin-Film Electrodes with\nPseudocapacitive Properties for Microbatteries

Abstract

LiMn₂O₄ (LMO) thin films are deposited on Si-based substrates\nwith Pt current collector via multi-layer pulsed-laser-deposition\ntechnique. The LMO thin films feature unique kinetics that yield outstanding\nelectrochemical cycling performance in an aqueous environment. At\nextremely high current densities of up to 1880 μA cm^–2 (≈ 348 C), a reversible capacity of 2.6 μAh cm^–2 is reached. Furthermore, the electrochemical cycling\nremains very stable for over 3500 cycles with a remarkable capacity\nretention of 99.996% per cycle. We provide evidence of significant\nnondiffusion-controlled, pseudocapacitive-like storage contribution\nof the LMO electrode.