NOVELTY - Forming battery cell (300) involves providing positive (322) and negative (321) electrodes; depositing first electrolyte layer (114) on negative electrode, and second electrolyte layer (124) on positive electrode; providing third electrolyte material having soft polymer or gel compared to other electrolyte layers; laminating first to second electrolyte layer using third electrolyte material to fill and fix defects in first or second layer to form composite electrolyte structure of battery cell; where third electrolyte layer (130) is applied as liquid and then dried.    USE - For making solid-state energy-storage devices such as thin-film (e.g. lithium) battery devices, used in portable devices such as computers, mobile phones, tracking systems and scanners.    ADVANTAGE - The cell has hard-soft-hard combination of electrolyte layers which provide low-cost, high-quality, high-reliability, highly rechargeable battery system; also the hard layers act as protective barrier layers during manufacture and as current spreader electrolyte that obtain smooth hard layer of lithium on anode upon charging.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for battery cell having electrodes, and electrolyte structure, where negative electrode includes first electrolyte layer covering at least portion of negative electrode and having randomly spaced defects; positive electrode includes cathode material and second electrolyte layer covering at least portion of positive electrode and having randomly spaced defects; and electrolyte structure includes third electrolyte material sandwiched between first and second electrolyte layers; where randomly spaced defects in the electrolyte layers are filled by the third soft electrolyte material.    DESCRIPTION OF DRAWING(S) - The figure shows schematic cross-sectional view of parallel-connected lithium battery.    Cathode material (112)    First electrolyte layer (114)    Second electrolyte layer (124)    Third electrolyte layer (130)    Lithium metal layer (122)    Lithium battery (300)    Cathode (321)    Anode (322)