An electrical energy storage device electrolyte comprising: a) an aprotic organic solvent system; b) an alkali metal salt, an aluminium salt, or a magnesium salt; c) an additive; and d) an ionic liquid compound, comprising: an anion; and a cation attached to a triazine moiety according to the formula: wherein: R is a Q + or R 1 or R 2; Q + is a pyrrolidinium, piperidinium, azepanium, onium, imidazolium, pyridinium or a 5- or 6-membered heterocyclic ring having 1 to 3 heteroatoms as ring members comprising nitrogen, oxygen, silicon or sulfur; R 1 and R 2 are independently a Ci-Cs alkyl, alkoxy, alkylsiloxy, phenyl, benzyl, silyl, thioether, sulfoxide, azo, amino or silane group, or a C 2 -C 8 alkenyl or alkynyl group, or a C 6 -C 8 aryl group, wherein any of the carbon atoms therein are optionally further substituted, or any of the hydrogen atoms therein are optionally replaced, with a halide, alkyl, alkenyl, alkoxy, aryl, alkynyl, alkylsiloxy, benzyl, silyl, thioether, sulfoxide, azo, amino or silane; and X is (a) a linker, comprising a C 1 -C 8 alkylene or alkyleneoxy, C 2 -C 8 alkenylene or alkynylene, ester, carbonyl, phenylene, thioether, sulfoxide, azo or C 6 -C 8 arylene group, wherein any of the carbon atoms therein are optionally further substituted, or the hydrogen atoms therein are optionally replaced, with a halide; (b) O, S; or (c) O, S attached to the linker, wherein when X is O, O attached to C 2 alkylene, or C 2 alkylene then Q + is not imidazolium. a) an aprotic organic solvent system; b) an alkali metal salt, an aluminium salt, or a magnesium salt; c) an additive; and d) an ionic liquid compound, comprising: an anion; and a cation attached to a triazine moiety according to the formula: wherein: R is a Q + or R 1 or R 2; Q + is a pyrrolidinium, piperidinium, azepanium, onium, imidazolium, pyridinium or a 5- or 6-membered heterocyclic ring having 1 to 3 heteroatoms as ring members comprising nitrogen, oxygen, silicon or sulfur; R 1 and R 2 are independently a Ci-Cs alkyl, alkoxy, alkylsiloxy, phenyl, benzyl, silyl, thioether, sulfoxide, azo, amino or silane group, or a C 2 -C 8 alkenyl or alkynyl group, or a C 6 -C 8 aryl group, wherein any of the carbon atoms therein are optionally further substituted, or any of the hydrogen atoms therein are optionally replaced, with a halide, alkyl, alkenyl, alkoxy, aryl, alkynyl, alkylsiloxy, benzyl, silyl, thioether, sulfoxide, azo, amino or silane; and X is (a) a linker, comprising a C 1 -C 8 alkylene or alkyleneoxy, C 2 -C 8 alkenylene or alkynylene, ester, carbonyl, phenylene, thioether, sulfoxide, azo or C 6 -C 8 arylene group, wherein any of the carbon atoms therein are optionally further substituted, or the hydrogen atoms therein are optionally replaced, with a halide; (b) O, S; or (c) O, S attached to the linker, wherein when X is O, O attached to C 2 alkylene, or C 2 alkylene then Q + is not imidazolium. an anion; and a cation attached to a triazine moiety according to the formula: wherein: R is a Q + or R 1 or R 2; Q + is a pyrrolidinium, piperidinium, azepanium, onium, imidazolium, pyridinium or a 5- or 6-membered heterocyclic ring having 1 to 3 heteroatoms as ring members comprising nitrogen, oxygen, silicon or sulfur; R 1 and R 2 are independently a Ci-Cs alkyl, alkoxy, alkylsiloxy, phenyl, benzyl, silyl, thioether, sulfoxide, azo, amino or silane group, or a C 2 -C 8 alkenyl or alkynyl group, or a C 6 -C 8 aryl group, wherein any of the carbon atoms therein are optionally further substituted, or any of the hydrogen atoms therein are optionally replaced, with a halide, alkyl, alkenyl, alkoxy, aryl, alkynyl, alkylsiloxy, benzyl, silyl, thioether, sulfoxide, azo, amino or silane; and X is (a) a linker, comprising a C 1 -C 8 alkylene or alkyleneoxy, C 2 -C 8 alkenylene or alkynylene, ester, carbonyl, phenylene, thioether, sulfoxide, azo or C 6 -C 8 arylene group, wherein any of the carbon atoms therein are optionally further substituted, or the hydrogen atoms therein are optionally replaced, with a halide; (b) O, S; or (c) O, S attached to the linker, wherein when X is O, O attached to C 2 alkylene, or C 2 alkylene then Q + is not imidazolium. R is a Q + or R 1 or R 2; Q + is a pyrrolidinium, piperidinium, azepanium, onium, imidazolium, pyridinium or a 5- or 6-membered heterocyclic ring having 1 to 3 heteroatoms as ring members comprising nitrogen, oxygen, silicon or sulfur; R 1 and R 2 are independently a Ci-Cs alkyl, alkoxy, alkylsiloxy, phenyl, benzyl, silyl, thioether, sulfoxide, azo, amino or silane group, or a C 2 -C 8 alkenyl or alkynyl group, or a C 6 -C 8 aryl group, wherein any of the carbon atoms therein are optionally further substituted, or any of the hydrogen atoms therein are optionally replaced, with a halide, alkyl, alkenyl, alkoxy, aryl, alkynyl, alkylsiloxy, benzyl, silyl, thioether, sulfoxide, azo, amino or silane; and X is (a) a linker, comprising a C 1 -C 8 alkylene or alkyleneoxy, C 2 -C 8 alkenylene or alkynylene, ester, carbonyl, phenylene, thioether, sulfoxide, azo or C 6 -C 8 arylene group, wherein any of the carbon atoms therein are optionally further substituted, or the hydrogen atoms therein are optionally replaced, with a halide; (b) O, S; or (c) O, S attached to the linker, wherein when X is O, O attached to C 2 alkylene, or C 2 alkylene then Q + is not imidazolium.