A Na4Fe(CN)6/NaCl solid solution cathode material with an enhanced electrochemical performance for sodium ion batteries

A Na4Fe(CN)6/NaCl solid solution was synthesized and investigated as a cathode material for sodium ion batteries. Pure Na4Fe(CN)6 and NaCl do not work as cathode materials for sodium ion batteries, while a sample of Na4Fe(CN)6/NaCl demonstrated a remarkably enhanced Na+ insertion/extraction capability and electrochemical performance, due to the cation vacancies and interconnected cages generated in the solid solution framework.