Structure optimization of Prussian blue analogue cathode materials for advanced sodium ion batteries

A structure optimized Prussian blue analogue Na1.76Ni0.12Mn0.88-[Fe(CN)(6)](0.98) (PBMN) is synthesized and investigated. Coexistence of inactive Ni2+(Fe-C N-Ni group) with active Mn2+/(3+) (Fe-C N-Mn group) balances the structural disturbances caused by the redox reactions. This cathode material exhibits particularly excellent cycle life with high capacity (118.2 mA h g(-1)).