NOVELTY - Composite has at least one layer filled with solid, e.g. a separator layer, and at least one second layer which can be a cathode or anode layer. The bonding layer can also assume the function of separator.    USE - Used in sensors, electrochromic windows, displays, capacitors, ion conducting film, and electrochemical cells, especially automobile, instrument, planar or polymer (all claimed) batteries, or rechargeable, e.g. lithium batteries and lithium ion batteries.    ADVANTAGE - The composite is able to withstand the mechanical stresses in production of batteries.    DETAILED DESCRIPTION - Composite includes:    (1) at least one first layer (alpha), free of electron conducting electrochemically active compound, comprising (Ia) that contains 1-100 wt.% (IIa);    (2) at least one second layer (beta), containing electron conducting electrochemically active compound.    (IIa) comprises:    (A) 1-95 wt.% of solid III, preferably basic, having primary particle size 5 nm-20 micrometers; and    (B) 5-99 wt.% of polymeric composition (IV) obtained by polymerisation of:    (i) 5-100 wt.% (based on composition (IV)) of product (V) obtained by polymerisation of:    (a) at least one compound (VI) able to react with carboxylic acid and/or sulphonic acid or derivatives, and    (b) at least one mole per mole of compound (VI) of a carboxylic acid and/or sulphonic acid (VII) which contains at least one free radically polymerisable functional group or derivative; and    (ii) 0-95 wt.% (based on composition (IV)) of further compound (VIII) having a mean molecular weight at least 5000 and polyether segments in the main chain or side chain.    The layers are joined by lamination using heat and/or pressure, or by using corona treatment of the first layer, then optionally the second layer.    INDEPENDENT CLAIMS are also included for following:    (1) production of composite;    (2) composite comprising at least one first layer (gamma), free of electron conducting electrochemically active compound and at least one second layer (beta), where (gamma) is similar to (alpha), except that polymer (IV) is replaced by polymer (IX), obtained by polymerisation of (c) 5-75 wt.% (based on polymer IX) of a free radically polymerisable compound (X) different from carboxylic acid and/or the sulphonic acid (VII) or its derivative, and (d) 25-95 wt.% (based on polymer IX) of (VIII); and    (3) composite comprising layer (alpha) or (gamma) joined to layer (beta) by bonding layer (delta).