Electronic Structure and Safety Insights into Prussian Blue Analog Cathode Behavior at Elevated Temperatures in Sodium-Ion Batteries.

ABSTRACT: Prussian blue analogs (PBAs) represent promising cathode materials for sodium-ion batteries (SIBs) due to their high theoretical capacity, open framework structure, and use of earth-abundant elements. However, the high-temperature structural evolution, water content effects, and thermal safety of PBAs, particularly in charged states, remain poorly understood, hindering their practical deployment. Here, we investigate Na₂Fe-[Fe-(CN)₆]·2H₂O using thermogravimetric analysis (TGA), ex situ and in situ temperature-dependent X-ray absorption spectroscopy (XAS), and accelerated rate calorimetry (ARC). TGA and ex situ XAS confirm water loss between 150 and 200 °C, resulting in Fe²⁺ oxidation, enhanced local symmetry, and uniform redox behavior that impro

SUBMITTER: Shipitsyn V 

PROVIDER: S-EPMC12498420 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature