Structurally Robust Prussian Blue Nanocubes as High-Rate Cathode Materials for Sodium- and Lithium-Ion Batteries

Abstract

Prussian blue (PB) nanocubes have been explored as promising cathode materials for high-performance sodium-ion (SIBs) and lithium-ion batteries (LIBs). These nanostructures exhibit good cycling stability and electrochemical resilience. They are synthesized through a co-precipitation method followed by vacuum drying, resulting in a porous and conductive nanocube framework. This architecture facilitates efficient ion diffusion, enhanced electrolyte accessibility, and effective mitigation of volume changes during cycling. In SIB applications, the PB nanocubes maintain stable performance over 300 and 400 cycles at current densities of 0.05 and 0.1 A g−1, respectively, and deliver a capacity of 26.2 mAh g−1 at 2.0 A g−1. For LIBs, they exhibit sustained cycling over 200 and 300 cycles under similar conditions, with a capacity of 20.2 mAh g−1 at 2.0 A g−1. These findings underscore the structural benefits of PB nanocubes for dual-ion battery systems.