Structural modulation of NH4V4O10 cathode materials for low-temperature zinc-ion energy-storage devices

Abstract

With the characteristics of nontoxicity and environmental benignity, aqueous zinc ion batteries (AZIBs) are rapidly emerging as potential competitors for high-performance energy-storage systems. Nevertheless, several issues hinder their further development, such as the sluggish electrochemical activity and inevitable dissolution of cathode materials. In this work, we introduced oxygen defects (O_d) into the NH₄V₄O₁₀ lattice, which facilitated the transport velocity of Zn²⁺ ions and enhanced their electrical conductivity. Zn//NHVO-O_d-1 batteries showed a reversible capacity of 475.3 mA h g⁻¹ at 0.2 A g⁻¹. At low temperature (0 °C), the cells also demonstrated a capacity retention of 100% after 1000 cycles at 1.0 A g⁻¹. Assembled soft-package devices presented favorable mechanical resilience at different bending conditions.