Design of new electrode materials for Li-ion and Na-ion batteries from the bloedite mineral Na 2 Mg(SO 4 ) 2 ·4H 2 O

Starting from the bloedite mineral, we prepared two new electrode materials, Na 2 Fe(SO 4 ) 2 ·4H 2 O and Na 2 Fe(SO 4 ) 2 , which present high redox potentials of 3.6 V vs. lithium and 3.3–3.4 V vs. sodium.