I have noticed many works about sodium sulfur batteries employing esters based electrolyte including EC/DMC/DEC, while the ethers rather than esters based electrolyte were widely reported in lithium sulfur batteries?
In Li–S batteries with carbonate-based electrolytes, severe nucleophilic addition or substitution reactions occur between the nucleophilic polysulfide anions and carbonate solvents, thus causing a rapid capacity fading. However, since the larger ionic radius of Na ions compared with Li ions makes it more difficult for Na+-polysulfide- ion pairs to dissociate in polar solvents, the reactivity of Na+-polysulfide- ion pairs is lower compared with that of Li+-polysulfide- ion pairs. Consequently, the above-mentioned side reactions between Na polysulfides and carbonate solvents are much less severe in Na–S batteries. (Energy Environ. Sci.,
2020, 13, 3848)
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