Fluorinated ethylene carbonate as electrolyte additive for rechargeable Na batteries

Abstract

Fluoroethylene carbonate is an efficient electrolyte additive to improve the reversibility of electrochemical sodium insertion for hard-carbon and NaNi 1/2Mn 1/2O 2 electrodes in aprotic Na cells. The additive is also capable of the electrochemical deposition/dissolution of metallic Na with higher reversibility because of improved passivation and suppression of side reactions between Na metal and propylene carbonate solution containing Na salts. © 2011 American Chemical Society.