Evaluation and realization of safer Mg-S battery: The decisive role of the electrolyte

The magnesium–sulfur (Mg-S) battery may be a safer alternative for the lithium-sulfur because Mg plating usually proceeds without dendrite formation. Here, we correlate thermal runaway of Mg-S with associated change electrolyte vapour pressure via testing calorimetry. Over-pressure builds up along programmed heating cell, and as result, is triggered at 20–45 K over boiling point, corresponding to 70–150 kPa difference between cell environment. distinct performance-safety-cost behaviours three ether type electrolytes stems from different CH 2 O chain lengths. Such molecular insight will serve fundamental guideline in choosing designing desired that simultaneously achieves high explosion limit good electrochemical performance . safety MgS mainly related electrolyte. over-pressure triggers explosion. subsequent exothermic reaction H caused sudden temperature jump battery. A modified DME higher point ideal • novel method evaluation introduced system. correlated pressure. relationship degree polymerisation.