NOVELTY - The electrolyte material for lithium-based batteries, comprises a first lamellar domain (510) having first linear polymer blocks and a lithium salt, where the first domain forms a conductive portion of the electrolyte material, a second lamellar domain (540) having second polymer blocks adjacent to the first lamellar domain, where the second domain forms a structural portion of the electrolyte material, and a third domain (520) having third polymer blocks. The electrolyte is formed into a desirable shape using a standard technique of extrusion, molding, calendaring, casting or printing.    USE - The electrolyte material is useful for lithium-based batteries, which are useful for portable electronic devices such as cellular phones, laptop computers and other consumer electronic products.    ADVANTAGE - The electrolyte material exhibits improved ionic conductivity, high energy density, high thermal stability, low rates of self-discharge, stable operation over a wide range of environmental conditions, enhanced safety, flexibility in battery configuration, minimal environmental impacts and low processing costs thus improving the energy and power densities and cycle life of the battery and reducing the loss of charge when the battery is not in use.    DETAILED DESCRIPTION - The electrolyte material for lithium-based batteries, comprises a first lamellar domain (510) having first linear polymer blocks and a lithium salt, where the first domain forms a conductive portion of the electrolyte material, a second lamellar domain (540) having second polymer blocks adjacent to the first lamellar domain, where the second domain forms a structural portion of the electrolyte material, and a third domain (520) having third polymer blocks. The electrolyte is formed into a desirable shape using a standard technique of extrusion, molding, calendaring, casting or printing. The electrolyte material has an ionic conductivity of lx 10-4 Scm-1 at 25 degrees C and an elastic modulus in excess of 1x 107 Pa at 90 degrees C. The first lamellar domain and the second lamellar domain comprise linear diblock copolymers having a molecular weight of 350000 Daltons, where each linear diblock copolymer comprises one of the first linear polymer blocks covalently bonded to one of the second polymer blocks. The third domain has a volume of 2-20% of the sum of the volumes of the first domain and the second domain. The first domain, the second domain and the third domain comprise linear tri-block copolymers, where each linear tri-block copolymer comprises one of the first, second and third polymer blocks. The second polymer block is covalently bonded to a first end of the first and third linear polymer blocks. The third polymer block is covalently bonded to a second end of the first and second linear polymer blocks. The first polymer block is covalently bonded to a first end of the second linear polymer block, and to a second end of the third linear polymer block. The linear tri-block copolymer has a molecular weight of 400000 Daltons. The first or second lamellar domain comprises perforations having height of 5-100 nanometers and center-to-center spacing of 5-100 nanometers on average. The first domain has a larger volume than the second domain, where the first domain fills the perforations in the second domain and viceversa. The second polymer blocks comprise a non-ionic-conducting polymer with a bulk modulus of greater than 10-7 Pa at 90 degrees C. The first polymer blocks and the second polymer blocks have a molecular weight of 100000 Daltons. The first domain comprises an additive that enhances ionic conductivity. The additive comprises an ionically conducting polymer, a room temperature ionic liquid, a high dielectric organic plasticizer or Lewis acids. The third polymer block comprises a rubbery polymer.    DESCRIPTION OF DRAWING(S) - The diagram shows a simplified view of three domains morphology of a solid polymer electrolyte.    Linear polymer blocks (505, 525, 545)    Conductive domains (510)    Polymer blocks (512, 514, 532)    Third domain (520)    Structural domain. (540)