Ammonium vanadate electrode materials with stable layered structures for rechargeable zinc ion batteries

Abstract

As electricity demand grows, it is important to develop some energy storage systems with a long cycle life and a high specific capacity. Aqueous Zn ion batteries (AZIBs) are emerging storage energy devices featuring high safety, environmentally friendliness, and abundant resources. Herein, we report a kind of unique double-layer structured NH₄V₄O₁₀ (NHVO) nanobelt as a cathode material. The assembled Zn/NHVO-1 batteries with 3 M Zn(CF₃SO₃)₂ electrolytes present an initial specific capacity of 423.79 mA h g⁻¹ at a current density of 0.1 A g⁻¹. In addition, they achieve a capacity retention of 87% after 2000 cycles at 2 A g⁻¹. Besides, they can also provide an energy density of 191.18 W h kg⁻¹ at a power density of 90 W kg⁻¹ at 0.1 A g⁻¹.