Recently, the first demonstration project of Prussian blue sodium-ion battery energy storage system developed by Li-Fun Technology Co.,Ltd. and other companies has been put into use. A representative from Li-Fun Technology stated that the sodium-ion battery cathode materials are mainly composed of transition metal layered oxide, polyanion compounds and Prussian blue compounds. Among them, Prussian blue sodium-ion batteries have lower cost, higher capacity, and better rate performance, showing great potential in the future.