Synthesis of battery-grade FePO4·2H2O using high-pressure hydrolyzed precipitates of cobalt–iron alloy acid solution

Abstract

Herein, we developed a facile method for the synthesis of battery-grade ferric phosphate (FePO₄·2H₂O) using high-pressure hydrolyzed precipitates of cobalt–iron alloy acid solution. The size of the prepared FePO₄·2H₂O samples was about 5–10 μm, and the microstructure of FePO₄·2H₂O was polyhedral. The FePO₄·2H₂O samples exhibited a high Fe/P ratio (1.03) compared with standard ferric phosphate (0.98–1.02), indicating potentially good electrochemical performance. The significance of the current work is that we have developed an effective method for the resource utilization of solid waste containing iron.