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(1/2)Mn(1/2)O(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.

A zero-strain layered metal oxide as the negative electrode for long-life sodium-ion batteries

“…The Coulombic efficiency after initial cycles can reach nearly 100%. (note that the low Coulombic efficiency at initial cycles is probably related to the electrolyte degradation and/or unstable metallic sodium electrode 14,21,57 ). Both parameters are crucial for a practical application.…”

High-capacity antimony sulphide nanoparticle-decorated graphene composite as anode for sodium-ion batteries

“…One molar NaClO 4 in propylene carbonate with 5 wt% fluorinated ethylene carbonate (FEC) was used as the electrolyte. FEC was added to improve the stability of the material with cycling 12,25 (see Supplementary Fig. S1 for comparison between electrolyte with and without FEC).…”

Ultraconcentrated Sodium Bis(fluorosulfonyl)imide-Based Electrolytes for High-Performance Sodium Metal Batteries

“…[20][21][22][23][24][25][26][27] Nevertheless, the practical application of Na metal batteries is quite challenging because the high chemical and electrochemical reactivity of Na metal electrodes with organic liquid electrolytes leads to low Coulombic efficiencies and limited cycling performance. 20,[24][25][26] Severe electrolyte decomposition at the Na metal electrode results in the formation of a resistive and non-uniform surface film, leading to dendritic Na metal growth. To control the Na metal electrode-electrolyte interface for high performance Na metal batteries, considerable efforts have been made to find electrolyte systems that are stable at the Na metal electrode.…”

“…To control the Na metal electrode-electrolyte interface for high performance Na metal batteries, considerable efforts have been made to find electrolyte systems that are stable at the Na metal electrode. 20,21,[23][24][25][26] The use of linear carbonates such as dimethyl carbonate (DMC), which are widely used as electrolyte solvents in lithium batteries, is limited due to their drastic decomposition at Na metal electrodes and sodiated hard carbon anodes. 24,27 Using fluoroethylene carbonate (FEC) as an electrolyte additive for in situ formation of an artificial solid electrolyte interphase (SEI) layer could stabilize the anode-electrolyte interface ( Figure 2).…”