Optimizing the electrolyte and binder composition for Sodium Prussian Blue, Na 1-x Fe x+(1/3) (CN) 6 ·yH 2 O, as cathode in sodium ion batteries

• DOI: 10.1016/j.electacta.2016.02.188
• Publication Date: 2016-03-15T15:03:40Z
• Authors: M. José Piernas-M...; E. Castillo-Martínez; J.L. Gómez-Cámer; T. Rojo
• Keywords: Prussian blue; Propylene carbonate; Carboxymethyl cellulose; Polyvinylidene fluoride

Abstract Na-ion batteries (NIB) are now attracting researchers’ attention as possible substitutes of Li-ion batteries. Promising cathode materials, which have demonstrated to work well for NIB are those based on the sodiated Prussian Blue, NaFeFe(CN) 6 , Prussian White, Na 2 FeFe(CN) 6 , and their analogues. Herein, the effect of different electrolytes and binder composition, on the electrochemical performance of sodium Prussian Blue, Na 0.75 Fe 2.08 (CN) 6 ·3.4H 2 O, as cathode material for NIB is studied. Several electrolytes containing NaClO 4 or NaPF 6 salts in carbonated mixtures, with and without fluoroethylene carbonate (FEC) as additive, have been tested for Na 0.75 Fe 2.08 (CN) 6 ·3.4H 2 O. The effect of different binders, polyvinylidene fluoride (PvdF), sodium carboxymethyl cellulose (CMC), polytetrafluoroethylene (PTFE) and ethylene propylene diene monomer ruber (EPDM), is also investigated.