| http://www.w3.org/ns/prov#value | - d) providing an anode comprising an alkali metal; e) providing a cathode of a cathode active material; f) activating the anode and the cathode with a non-aqueous electrolyte comprising a sulfate additive having the general formula R1OS (=O2) (OR2), wherein at least one of the R1 and R2 is an organic group containing at least 3 carbon atoms and being selected from either a structure of the type C(s
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