NOVELTY - The battery has a multilayer structure metal ion conducting solid state electrolyte separator (125) located between a metal ion negative half-cell and a dispersed solid state electrolyte (130) of a positive half-cell. A set of current collectors (135, 140) is placed on carrier substrates. A negative lithium electrode and a thin or thick lithium-absorbing layer (120) are formed on the separator. The positive electrode and current collectors are laminated on a top of the separator. The electrolyte is infused into pores of a positive electrode under vacuum with or without thermal treatment.    USE - Hybrid solid state battery i.e. lithium-ion battery (claimed), for use in energy storage applications e.g. portable electronics, power tools, medical devices and sensors. Can also be used as a sodium-ion battery.    ADVANTAGE - The battery proposes manufacturing transition in which liquid/polymer/gel electrolyte and solid state electrolyte are used together in a lithium-ion cell and an increasing proportion of solid state electrolyte replacing conventional electrolytes is envisaged so as to facilitate transition to solid state electrolyte-based lithium-ion battery in an efficient manner. The positive half-cell can be constructed using the positive electrode infused with liquid, gel or polymer electrolyte, so that lithium-ion conducting ceramic material is used as a membrane between the negative electrode and the electrolyte filled positive electrode, thus improving safety of the cell in a simple manner. The battery defines liquid electrolyte content less than a conventional liquid electrolyte lithium-ion cell, so that the liquid/gel/polymer electrolyte does not come in contact with metallic lithium, thus improving battery safety in a quick manner, while eliminating shorting of the negative electrode to the positive electrode and overheating of the cell, increasing available capacity of a series stack, and reducing a problem of over-charging of some cells in the battery due to stacking of cells with different capacities to prevent premature failure or thermal runaway of overcharged cells, while reducing cost of the battery and increasing energy density at the cell and pack level.    DETAILED DESCRIPTION - The electrolyte separator is made of lithium thiophosphate and lithium phosphorus oxynitride. The current collectors are coated with a composite of lithium metal oxide, conductive additive and polymeric binder. The dispersed solid state electrolyte is selected from a group consisting of a liquid electrolyte, a gel electrolyte and a polymer electrolyte. An INDEPENDENT CLAIM is also included for a method for fabricating a lithium-ion cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a hybrid battery cell.    Hybrid solid state electrolyte and liquid electrolyte cell (100)    Thin or thick lithium-absorbing layer (120)    Multilayer structure metal ion conducting solid state electrolyte separator (125)    Dispersed solid state electrolyte (130)    Current collectors (135, 140)