A silicon-containing polyether electrolyte solvent composition comprising: (a) at least one compound selected from the compositions represented by the following structure: M 1 a M 2 b D 1 c D 2 d T 1 e T 2 f Q g wherein M 1 is selected from R 1 R 2 R 3 SiO 1/2 or M' a monovalent organic radical containing one or more heteroatoms O, N and/or S; wherein M 2 is selected from R 4 R 5 R 6 SiO 1/2; wherein D 1 is selected from R 7 R 8 SiO 2/2 or D' a divalent organic radical containing one or more heteroatoms O, N and/or S; wherein D 2 is selected from R 9 R 10 SiO 2/2; wherein T 1 is selected from R 11 SiO 3/2 or T' a trivalent organic radical containing one or more heteroatoms O, N and/or S; wherein T 2 is selected from R 13 SiO 3/2; wherein Q is selected from SiO 4/2 or Q' a tetravalent organic radical containing one or more heteroatoms O, N and/or S; and wherein a, b, c, d, e, f, and g are independently selected from either zero or a positive integer subject to the provisos that 0 < a + b + c + d + e + f + g < 50 and b + d + f + g > 0, wherein R 1, R 2, R 3, R 5, R 6, R 7, R 8, R 10, and R 11 are each independently selected from monovalent hydrocarbon radicals having from 1 to about 10 carbon atoms; monovalent hydrocarbon heteroatom-containing radicals having from 1 to about 10 carbon atoms wherein the one or more heteroatoms are selected from one or more halogens, O, N, or combinations of any two or more thereof; or monovalent polyalkylene oxide residuals, wherein R 4, R 9 and R 13 are each independently selected from monovalent radicals that contain an oxirane moiety, with the proviso that at least one of R 1, R 2, R 3, R 5, R 6, R 7, R 8, R 10, R 11, M', D', T' or Q' contains a polyalkylene oxide residual if none of R 4, R 9 and R 13 contains a polyalkylene oxide residual, and with the proviso that the silicon-containing polyether contains at least one oxirane moiety. (a) at least one compound selected from the compositions represented by the following structure: M 1 a M 2 b D 1 c D 2 d T 1 e T 2 f Q g wherein M 1 is selected from R 1 R 2 R 3 SiO 1/2 or M' a monovalent organic radical containing one or more heteroatoms O, N and/or S; wherein M 2 is selected from R 4 R 5 R 6 SiO 1/2; wherein D 1 is selected from R 7 R 8 SiO 2/2 or D' a divalent organic radical containing one or more heteroatoms O, N and/or S; wherein D 2 is selected from R 9 R 10 SiO 2/2; wherein T 1 is selected from R 11 SiO 3/2 or T' a trivalent organic radical containing one or more heteroatoms O, N and/or S; wherein T 2 is selected from R 13 SiO 3/2; wherein Q is selected from SiO 4/2 or Q' a tetravalent organic radical containing one or more heteroatoms O, N and/or S; and wherein a, b, c, d, e, f, and g are independently selected from either zero or a positive integer subject to the provisos that 0 < a + b + c + d + e + f + g < 50 and b + d + f + g > 0, wherein R 1, R 2, R 3, R 5, R 6, R 7, R 8, R 10, and R 11 are each independently selected from monovalent hydrocarbon radicals having from 1 to about 10 carbon atoms; monovalent hydrocarbon heteroatom-containing radicals having from 1 to about 10 carbon atoms wherein the one or more heteroatoms are selected from one or more halogens, O, N, or combinations of any two or more thereof; or monovalent polyalkylene oxide residuals, wherein R 4, R 9 and R 13 are each independently selected from monovalent radicals that contain an oxirane moiety, with the proviso that at least one of R 1, R 2, R 3, R 5, R 6, R 7, R 8, R 10, R 11, M', D', T' or Q' contains a polyalkylene oxide residual if none of R 4, R 9 and R 13 contains a polyalkylene oxide residual, and with the proviso that the silicon-containing polyether contains at least one oxirane moiety.