Na2Co3[Fe(CN)6]2: A promising cathode material for lithium-ion and sodium-ion batteries

• A Prussian blue analogue has been fabricated by a facile co-precipitation method.
• Na2Co3[Fe(CN)6]2 has been studied as an cathode material for lithium-ion and sodium-ion batteries.
• The synthesized material has steady cycling performance.

A Prussian blue analogue, Na2Co3[Fe(CN)6]2, has been fabricated by a facile co-precipitation method at room temperature as a potential cathode material for both lithium-ion and sodium-ion batteries. It found that the Na2Co3[Fe(CN)6]2 nanoparticles with a primary particle size of 30–40 nm have been synthesized, and exhibited an excellent electrochemical performance, including a long cycling behavior in lithium-ion batteries and a good rate performance in sodium-ion batteries. In lithium-ion batteries, the Na2Co3[Fe(CN)6]2 nanoparticles cathode can deliver an excellent cyclic performance with 73.0% retention of initial capacity after 50 cycles at 50 mA g−1. Moreover, when Na2Co3[Fe(CN)6]2 is used as cathode material of sodium-ion batteries, it exhibits an outstanding rate performance exceeding 75.2% retention of initial capacity after 50 cycles at 200 mA g−1. Therefore, the Na2Co3[Fe(CN)6]2 nanoparticles can be a potential cathode candidate for the application of lithium-ion and sodium-ion batteries due to its excellent electrochemical performance, easy preparation, low cost and environment benefits.