Surface modification with lithium silicate to enhance the electrochemical performance of high-valence metal oxide compound MnTeMoO6

Abstract

Surface modification is an effective technique to improve the electrochemical performance of electrode materials. However, although carbon coating is cheap and applicable, it is unsuitable for some high-valence metal oxide compounds due to the reduction of carbon. In this work, manganese tellurium molybdate, MnTeMoO₆, was developed utilizing lithium silicate Li₂SiO₃ coating as an extra solid-state electrolyte layer, and its electrochemical performance was investigated in detail. Importantly, the dQ/dV curve and AC impedance test under variable temperatures were further analyzed to demonstrate the relationship between changes in the discharge platform during the discharge process of the electrode material. The activation energy E_a of the interfacial lithium-ion transfer at the electrode interface was evaluated preliminarily. It was confirmed that the MnTeMoO₆@Li₂SiO₃ composites exhibited enhanced electrochemical performance with lower activation energy than that of the bare compound.