NOVELTY - A mixture of lithium ion conductive solid and polymeric composition is used to increase cycle life of lithium ion batteries.    USE - The Li-ion conducting solid material (A) is useful in a solid electrolyte, separator or electrode to increase the cycle stability of electrochemical cells.    ADVANTAGE - (A) has improved mechanical, thermal and electrical properties and lithium ion batteries containing (A) have improved cycle life.    DETAILED DESCRIPTION - A mixture (I) contains a mixture (II) consisting of : (A) 1-95 wt. % of a Li-ion conducting solid, preferably a basic Li-ion conducting solid having a particle size of 5 nm-20 microns and (B) 5-99 wt.% of a polymeric composition obtained by polymerisation of (B1) 5-100 wt.% (wrt (B)) of a condensation product of at least a compound that is able to react with a carboxylic acid and/or sulfonic acid or derivatives and at least one molar equivalence of a carboxylic acid and/or sulfonic acid or derivative having at least a radically polymerizable functional group and (B2) 0-95 wt.% (wrt (B)) of a compound having a number average mol. wt. of at least 5000 with polyether segments in the main or side chain whereby the mixture (I) contains 1-100 wt.% (II).    INDEPENDENT CLAIMS are included for (i) a mixture (III) containing a mixture (IV) consisting of 1-95 wt.% (A), 5-99 wt.% of a polymer prepared by polymerisation of 5-75 wt.% of a radically polymerizable compound that is different to the carboxylic acid or sulfonic acid in (B1) and 25-95 wt.% (B2) whereby (III) contains 1-100 wt.% (IV). (ii) a composite article (V) comprising at least a first layer that contains an electronically conducting, electrochemically active compound and at least a second layer comprised of (I) or (III) and free of electronically conductive, electrochemically active compounds. (iii) a solid electrolyte, separator, electrode, sensor, electrochromic window, display, capacitor or ionically conductive film containing (I), (III) or composite article (V) (iv) an electrochemical cell, comprising a solid electrolyte, separator and/or an electrode comprising (I), (III) or (V).