Method for preparing electrodes for an electrochemical storage cell

Claim 1

A method for preparing an electrode for an electrochemical storage cell, the electrode comprising a collector part of an electronically conductive and chemically inert material coated on an electrochemically active part comprising an oxide of a metal, as well as a partly reticulated polymer, the method comprising: A. preparing a substantially saturated solution of said polymer in water, and adding an agent capable of forming an aldehyde in a quantity sufficient for partly reticulating said polymer in contact with at least a catalyst, in a proportion of 5 to 20% by weight of the agent capable of forming the aldehyde based on the weight of said polymer; B. adding a salt of said metal to the aqueous solution of said polymer in a proportion of 20 to 50 parts by weight for one part of said polymer, said salt being soluble in water and compatible with said polymer; the addition being at a temperature between 50° and 100°C; C. filling a mould in which said collector part of the electrode has previously been placed with said solution, until said collector part of the electrode is completely immersed; D. cooling the mould to a temperature of no lower than -20°C; E. removing the cake formed in D) from said mould and immersing said cake in an alkaline solution saturated with an oxide of said metal; F. washing said cake in cold water; G. drying said cake at a temperature between 20° and 60°C; and H. compressing said cake at a pressure between 2 and 10 bars/sq.cm., whereby longitudinal strips of a material having, with respect to said electrochemically active part of said electrode, non-adhesive properties are deposited on each of the faces of said collector part, so that a space thus remains between said electrochemically active part and each of the longitudinal strips.

Claim 2

A method for preparing an electrode for an electrochemical storage cell, the electrode comprising a collector part of an electronically conductive and chemically inert material coated on an electrochemically active part comprising an oxide of a metal, as well as a partly reticulated polymer, the method comprising: A. preparing a substantially saturated solution of said polymer in water, and adding an agent capable of forming an aldehyde in a quantity sufficient for partly reticulating said polymer in contact with at least a catalyst, in a proportion of 5 to 20% by weight of the agent capable of forming the aldehyde based on the weight of said polymer; B. adding a salt of said metal to the aqueous solution of said polymer in a proportion of 20 to 50 parts by weight for one part of said polymer, said salt being soluble in water and compatible with said polymer; the addition being at a temperature between 50° and 100°C; C. filling a mould in which said collector part of the electrode has previously been placed with said solution, until said collector part of the electrode is completely immersed; D. cooling the mould to a temperature of no lower than -20°C; E. removing the cake formed in D) from said mould and immersing said cake in an alkaline solution saturated with an oxide of said metal; F. washing said cake in cold water; G. drying said cake at a temperature between 20° and 60°C; and H. compressing said cake at a pressure between 2 and 10 bars/sq.cm., whereby longitudinal strips of a material having, with respect to said electrochemically active part of said electrode, non-adhesive properties are deposited on each of the faces of said collector part, so that a space thus remains between said electrochemically active part and each of the longitudinal strips.

Claim 8

A method for preparing an electrode for an electrochemical storage cell, the electrode comprising a collector part of an electronically conductive and chemically inert material coated on an electrochemically active part comprising an oxide of a metal, as well as a partly reticulated polymer, the method comprising: A. preparing a substantially saturated solution of said polymer in water, and adding an agent capable of partly reticulating said polymer in contact with at least a catalyst, in a proportion of 5 to 20% by weight of the agent capable of partly reticulating said polymer based on the weight of said polymer; B. adding a salt of said metal to the aqueous solution of said polymer in a proportion of 20 to 50 parts by weight for one part of said polymer, said salt being soluble in water and compatible with the polymer, the addition being at a temperature between 50° and 100°C; C. filling a mould in which said collector part of the electrode has previously been placed with said solution, until said collector part of the electrode is completely immersed; D. cooling the mould to a temperature of no lower than -20°C; E. removing the cake formed in D) from said mould and immersing said cake in an alkaline solution saturated with an oxide of said metal; F. washing said cake in cold water; G. drying said cake at a temperature between 20° and 60°C; and H. compressing said cake at a pressure between 2 and 10 bars/sq.cm., whereby said collector part is previously coated with a material having, with respect to said electrochemically active part of the electrode, non-adhesive properties, so that a space thus remains between said electrochemically active part and said collector.

Claim 9

A method for preparing an electrode for an electrochemical storage cell, the electrode comprising a collector part of an electronically conductive and chemically inert material coated on an electrochemically active part comprising an oxide of a metal, as well as a partly reticulated polymer, the method comprising: A. preparing a substantially saturated solution of said polymer in water, and adding an agent capable of partly reticulating said polymer in contact with at least a catalyst, in a proportion of 5 to 20% by weight of the agent capable of partly reticulating said polymer based on the weight of said polymer; B. adding a salt of said metal to the aqueous solution of said polymer in a proportion of 20 to 50 parts by weight for one part of said polymer, said salt being soluble in water and compatible with the polymer, the addition being at a temperature between 50° and 100°C; C. filling a mould in which said collector part of the electrode has previously been placed with said solution, until said collector part of the electrode is completely immersed; D. cooling the mould to a temperature of no lower than -20°C; E. removing the cake formed in D) from said mould and immersing said cake in an alkaline solution saturated with an oxide of said metal; F. washing said cake in cold water; G. drying said cake at a temperature between 20° and 60°C; and H. compressing said cake at a pressure between 2 and 10 bars/sq.cm., whereby said collector part is previously coated with a material having, with respect to said electrochemically active part of the electrode, non-adhesive properties, so that a space thus remains between said electrochemically active part and said collector.