Enhanced Nitrogen-Doped Reduced Graphene Oxide-Embedded MnMoO4 as High-Capacity and Stable Anode for Sodium-Ion Batteries

Abstract

Nanostructures of ternary metal oxides have been modified with nitrogen-doped reduced graphene oxide (rGO) to enhance electronic conductivity and also effectively mitigate volume variations in anodes used for sodium-ion batteries (SIBs). Unlike bimetallic metal oxides, ternary metal oxides undergo multiple redox reactions, resulting in high capacity. However, the effective anode type, MnMoO4 (MTMOs), is significantly challenged by volume expansion and contraction issues throughout the charge and discharge process, which leads to capacity decay and poor cyclability in SIBs. In this study, we report an N-doped rGO-embedded MnMoO4 composite as an excellent anode, that can withstand the volume accommodation related issue due to numerous active sites in MnMoO4. The as-prepared MnMoO4@rGO@g-C3N4 composite electrode exhibited a capacity of 135 mAh g−1 after 800 cycles at a high current density of 1 A g−1 and, the cell retained 58.2% of its initial capacity even after 900 cycles. The N-doped rGO-embedded MnMoO4 demonstrates superior electrochemical properties and holds promise as the next-generation anode material for sodium-ion batteries.