Only few DEMS studies on SIBs have been published to date, most of them in the last years . While more knowledge on the gassing in LIBs exists , not all of it can be easily transferred to SIBs. Especially when using half-cell configurations (i.e. Li or Na are used as counter electrode), the higher reactivity of Na metal and the higher solubility of degradation products in the electrolyte solvents lead to new challenges. Also, the storage mechanism like in the case of graphite can be completely different. Most publications focus on cells with carbonate-based electrolytes as they are the common electrolytes in LIBs . Much less is known about the stability of ethers although they are attractive solvents for next generation batteries. A popular ether solvent is diglyme (2G). Thanks to its favorable stability at low (reductive) potentials, it has been used to study a variety of anode materials such as Sn or graphite as well as various types of full cells with Na metal as anode . On anode materials, 2G is believed to form a thin and stable SEI from ether polymerization . Possible decomposition products may be therefore ethane, methane and dimethyl ether, however, they are not always detected. For examples, while Tsiouvaras and Meini et al. confirmed the formation of dimethyl ether in Li-O2 batteries , Qin et al. found only H2 release on the tin anodes in SIBs . On the other hand, ethers are generally believed to be less stable at high (oxidative) potentials . Gas evolution can also strongly depend on the conductive salt, as shown for a variety of 2G electrolyte formulations for graphite electrodes or symmetric Na|Na cells. Overall, however, there exists only little information on the gassing behavior of SIBs.