Investigation of the Electrochemical Properties of 3D Recyclable Aluminium doped LiMn2O4 Electrode: Improved Power and Energy Densities for Lithium-ion Battery Usage

Abstract

The Composites of Al-Doped LiMn₂O₄; Al_0.1:(LiMn₂O₄)_0.9 and AI_0.3:(LiMn₂O₄)_0.7, were prepared using the hydrothermal method and drop casting deposition technique. The electrochemical performance of the Al-doped LiMn₂O₄ composite as a promising anode material for lithium-ion batteries was characterised by cyclic voltammetry analysis, electrochemical impedance spectroscopy and galvanostatic charge discharge analysis. The anodes' material exhibits a reversible capacity loss, which can be primarily linked to reverse reactions within the solid electrolyte interface formation, aluminium adsorption in the conducting LiMn₂O₄, and the electrolyte's electrochemical breakdown. The charges that are retained in the anode material during charging showed a linear decline in charge capacity as charging current intensity increased. Ionic polarisation was the reason for the observed drop in the charge and discharge capabilities at the current density of 5 A/g. Having greater specific capacitance and energy density, the composite Al_0.1:(LiMn₂O₄)_0.9, is a better anode material for electrochemical applications compared to Al_0.3:(LiMn₂O₄)_0.7, also its comparatively higher power density at a scan rate of 5 mV/s is mostly explained by its lower equivalent series resistance.