TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: The device further comprises at least one cathode, at least one porous separator and at least one anode. The electrolyte is a liquid, solid or gel. The electrolyte includes an additive selected to form a passivation layer on the electrode.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Materials: The cathode includes a lithium metal oxide and the anode includes at least one material selected from carbon or lithium metal.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: A third one of the silicons and a fourth one of the silicons are each linked to side chains that each exclude a poly(alkylene oxide) moiety and/or a cyclic carbonate moiety. The first silicon and the second silicon are terminal silicons or central silicon. The first silicon is linked directly to an oxygen included in the poly(alkylene oxide) moiety. The side chain linked to the first silicon includes an organic spacer positioned between the first silicon and the poly(alkylene oxide) moiety. An organic spacer links the poly(alkylene oxide) moiety to the first silicon. The first silicon is linked directly to the poly(alkylene oxide) moiety. The electrolyte includes an organoborate salt. The electrolyte includes the tetrasiloxane entrapped within a network polymer. The network polymer is a product of polymerizing a diallcyl acrylate, a dimethacrylate, a diallcyl methacrylate or a diallyl terminated compound. The electrolyte includes a solid polymer. The solid polymer is polyacrylonitrile (PAN), poly(methyl methacrylate) (PMMA), poly(vinylidene fluoride) (PVdF), poly(vinylidene fluoride-co-hexafluoropropylene), poly(vinyl acetate), polystyrene, poly(ethylene oxide) (PEO). The additive consists of vinyl carbonate, vinyl ethylene carbonate, ethylene sulfite, 1,3 dimethyl butadiene, styrene carbonate, aromatic carbonates, vinyl pyrrole, vinyl piperazine, vinyl piperidine, and/or vinyl pyridine.Preferred Compounds: The tetrasiloxane is represented by: R12-(O-C(R10)H-CH2)x-O-R8-Si(R5)(R6)-O-Si(R1)(R2)-O-Si(R1)(R2)-O-Si(R3)(R4)-R7-O-(CH2-C(R9)H-O)y-R11; CH3O(CH2CH2O)n(CH2)3-(-Si(CH3)2-O-)3-Si(CH3)2- (CH2)3O(CH2CH2O)mCH3; CH3(OCH2CH2O)nO-(-Si(CH3)2-O-)3-Si(CH3)2-O (CH2CH2O)mCH3; or Z3SipO-Si(R20)(R22)-O-Si(R21)(R23)-O-SiZ3. The tetrasiloxane is of formula (1) or (2).R1, R2=alkyl;R3-R6, R11, R12, R20, R21, R26, R29=alkyl or aryl;R7, R8, R24=nil or spacer;R9, R11, R25, R28=H, alkyl or aryl;x, y, n, m, p, q=1-12;R22=group of formula: -R24-O-(CH2-C(R25)H-O)p-R26 (II-A);R23=group of formula: -O-(CH2-C(R28)H-O)q-R29 (II-B) or (II-C);Z=alkyl or an aryl group;R30=organic spacer;r=1-2.Preferred Compositions: The tetrasiloxane is more than 50 wt.% of the electrolyte. The electrolyte includes 0.3-2.0M alkali metal salt. Preferred Definitions:    R1-R6, R11, R12=Me.