Compagnie Generale D'electricite

Bernard Chenaux

Georges Feuillade

Philippe Perche

Alain Leroux

The invention relates to an electrode for a lead accumulator. It includes an electronically conductive core coated with an active material which contains grains of lead monoxide, lead sulphate and a binding agent which is suitable for forming a three-dimensional thread-like network, characterized in that said electrode further includes a material which is insoluble in sulphuric acid and permeable to conductivity ions, the material being chosen from the group which includes polyacrylic acid and hydroxyethylmethacrylate and being used in a proportion by weight of 0.25 to 2% with respect to said lead monoxide.

Electrode for a lead accumulator

Electrochemical elements in thin layers comprising a stack of thin layers, successively a copper layer, a catholyte, a separator, a lithium layer, the catholyte and the separator being formed by a gel comprising more particularly formal or polyvinylic butyral, reticulated or otherwise and impregnated with a solvent such as propylene carbonate or N-methyl-pyrrolidone saturated with an ionically conductive salt such as ammonium perchlorate. A variant consists in forming the separator with a gel of reticulated polymer basically containing polyvinylidene fluoride and a mineral charge such as magnesia.

Method for preparing electrochemical elements in thin layers

Electrochemical elements in thin layers comprising a stack of thin layers, successively a cooper layer, a catholyte, a separator, a lithium layer, the catholyte and the separator being formed by a gel comprising more particularly formal or polyvinylic butyral, reticulated or otherwise and impregnated with a solvent such as propylene carbonate or N-methyl-pyrrolidone saturated with an ionically conductive salt such as ammonium perchlorate. A variant consists in forming the separator with a gel of reticulated polymer basically containing polyvinylidene fluoride and a mineral charge such as magnesia.

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Paris, France

Bernard Chenaux