(JP9223498-A)      Prepn. of a current collector in contact with the cathode material in light rechargeable solid state batteries comprises the deposition on a nickel layer, having a rugosity Ra of 1-3 microns, of a cathode paste comprising (1) a powder of active cathode material; (2) an electronic conductor; (3) a polymeric compsn. essentially constituted by (3a) a polymer deriving from the polymerisation of a mixt. of a vinyl ether of general formula R-[O-CH2-CH2]n-O-CH=CH2 (I) and a divinyl ether of general formula CH2=CH-[O-CH2CH2]m-O-CH=CH2 (II): where R = methyl or ethyl, n = 1-16, m = 1-10; (3b) lithium salts selected from LiBF4 alone or in a mixt. with other salts.    Also claimed is an electrochemical cell in the form of a thin layer comprising (a) an alkali metal anode; (b) an ionically conducting polymeric electrolyte; (c) a composite cathode deposited on a current collector constituted by a nickel foil prepd. as above.    USE -   These current collectors are used in light rechargeable solid state batteries, for use in the "consumer" sector, e.g. for credit cards, hand cellular telephones, computers, and in the automotive sector.    ADVANTAGE -   This process allows very good adherence between the cathode and the current collector, partic. nickel. Batteries contg. these electrochemical cells attain a higher number of cycles than those in prior art.    (US5798190-A)      Prepn. of a current collector in contact with the cathode material in light rechargeable solid state batteries comprises the deposition on a nickel layer, having a rugosity Ra of 1-3 microns, of a cathode paste comprising (1) a powder of active cathode material; (2) an electronic conductor; (3) a polymeric compsn. essentially constituted by (3a) a polymer deriving from the polymerisation of a mixt. of a vinyl ether of general formula R-[O-CH2-CH2]n-O-CH=CH2 (I) and a divinyl ether of general formula CH2=CH-[O-CH2CH2]m-O-CH=CH2 (II): where R = methyl or ethyl, n = 1-16, m = 1-10; (3b) lithium salts selected from LiBF4 alone or in a mixt. with other salts.    Also claimed is an electrochemical cell in the form of a thin layer comprising (a) an alkali metal anode; (b) an ionically conducting polymeric electrolyte; (c) a composite cathode deposited on a current collector constituted by a nickel foil prepd. as above.    USE -   These current collectors are used in light rechargeable solid state batteries, for use in the "consumer" sector, e.g. for credit cards, hand cellular telephones, computers, and in the automotive sector.    ADVANTAGE -   This process allows very good adherence between the cathode and the current collector, partic. nickel. Batteries contg. these electrochemical cells attain a higher number of cycles than those in prior art.    (EP766331-B1)      Prepn. of a current collector in contact with the cathode material in light rechargeable solid state batteries comprises the deposition on a nickel layer, having a rugosity Ra of 1-3 microns, of a cathode paste comprising (1) a powder of active cathode material; (2) an electronic conductor; (3) a polymeric compsn. essentially constituted by (3a) a polymer deriving from the polymerisation of a mixt. of a vinyl ether of general formula R-[O-CH2-CH2]n-O-CH=CH2 (I) and a divinyl ether of general formula CH2=CH-[O-CH2CH2]m-O-CH=CH2 (II): where R = methyl or ethyl, n = 1-16, m = 1-10; (3b) lithium salts selected from LiBF4 alone or in a mixt. with other salts.    Also claimed is an electrochemical cell in the form of a thin layer comprising (a) an alkali metal anode; (b) an ionically conducting polymeric electrolyte; (c) a composite cathode deposited on a current collector constituted by a nickel foil prepd. as above.    USE -   These current collectors are used in light rechargeable solid state batteries, for use in the "consumer" sector, e.g. for credit cards, hand cellular telephones, computers, and in the automotive sector.    ADVANTAGE -   This process allows very good adherence between the cathode and the current collector, partic. nickel. Batteries contg. these electrochemical cells attain a higher number of cycles than those in prior art.