High-performance MnV12O31 cathode for aqueous zinc-ion battery

Abstract

With the increasing shortage of global resources, efficient and environmentally friendly electrochemical energy storage technology is becoming a research hotspot. Although the traditional lithium-ion battery has the advantage of high energy density, it faces the challenges of lithium resource depletion and organic electrolyte safety hazards. In this context, aqueous zinc-ion batteries are considered as a promising next-generation energy storage device due to their safety and cost advantages. Among many cathode materials, vanadium-based compounds have outstanding performance, among which MnV₁₂O₃₁ has attracted wide attention due to its unique structural characteristics. The structural water in hydrated metal ions can shield the positive charge of the metal ions and increase the ionic radius, thereby reducing the effective charge of the hydrated metal ions and weakening the electrostatic repulsion between the hydrated metal ions and the cathode material. The experimental data shows an excellent energy storage performance that the MnV₁₂O₃₁ nano-composite material can achieve a high specific capacity of 610 mAh g⁻¹ at the current density of 0.1 A g⁻¹. It is worth noting that even after 1000 cycles at a high current density of 10 A g⁻¹, it can still maintain 75 % of the initial capacity so that reflecting excellent cycle stability. These excellent electrochemical properties indicate that MnV₁₂O₃₁ nanocomposites have broad application prospects in the field of high-performance zinc ion battery cathode materials, and are expected to promote the development of a new generation of high energy density energy storage systems.