Rechargeable Na–SO₂Battery with Ethylenediamine Additive in Ether‐Based Electrolyte

Abstract

Rechargeable metal-SO 2 batteries have drawn tremendous attention because it can accelerate SO 2 fixation/utilization and offer high energy density. Herein, a rechargeable Na-SO 2 battery based on an ether-based liquid electrolyte with an ethylenediamine (EDA) additive is realized via the reversible formation/decomposition of Na 2 S 2 O 4 . Experimental investigations reveal that the EDA additive provides three benefits by simultaneously decreasing the overall electrode polarization, increasing the full discharge capacity, and improving battery cyclability. At a current density of 250 mA g −1 , the full discharge capacity of the battery with the EDA additive is more than twice of a similar system in the absence of EDA. In addition to the significantly enhanced capacity, the as-assembled Na-SO 2 battery demonstrates excellent cyclic stability after 200 cycles, which is equivalent to a total duration of 1600 h. Moreover, the corrosion resistance of Na anode is strengthened with the aid of EDA in the SO 2 -containing liquid electrolyte. This work will pave the way for Na-SO 2 batteries as a promising battery technology toward both pollutant gas utilization and energy storage.

In situ preparation of gel polymer electrolyte for lithium batteries: Progress and perspectives

“…Along the process of further expanding the above system, it is found that similar reaction between metallic Na and EDA cannot occur, which have been verified by both density functional theory (DFT) calculation (Figure 5(C)) and experiments. 67 Even though the EDA additive could effectively enhance the corrosion resistance of Na anode and reduce the overall electrode polarization, the cross-linking reaction of G4 solvent could not be performed, and thus no gel formed.…”

CO2‐Induced Melting and Solvation Reconfiguration of Phase‐Change Electrolyte

“…Among metal-gas battery systems, [41][42][43][44] Li-CO 2 batteries have been well-placed to achieve energy storage and release because of the high theoretical energy density and CO 2 fixation/ utilization. [45,47] In such a system, the battery generally operates on the principle that Li 2 CO 3 and carbon are generated and then decomposed at the cathode side (4Li + 3CO 2 ⇌ 2Li 2 CO 3 + C).…”

Growth Mechanism of Micro/Nano Metal Dendrites and Cumulative Strategies for Countering Its Impacts in Metal Ion Batteries: A Review

“…Ethylenediamine additives have recently gained attention, especially in ether-based electrolytes. The specific amount of ethylenediamine addition forms a Na2S2O4 selfhealing SEI layer with high discharge capacity, reduced polarization, and negligible corrosion effects [380]. As discussed earlier, Rb + and Cs + have also been studied as good additives for carbon-based electrodes in addition to FEC.…”