is an organic binder which is electrochemically stable in the range of operation of the negative electrode mention may be made by way of examples of poly vinylidene fluoride homopolymers or an ethylene propylene diene copolymer a poly polyvinylidene fluoride is particularly preferred a composite negative electrode can be prepared by introducing the carbonaceous compound into a solution of the binder in a polar aprotic solvent by spreading the mixture obtained over a copper disk acting as collector and by then evaporating the solvent under hot conditions under a nitrogen atmosphere when the negative electrode is composed of an insertion material the battery is said to be a u201c lithium ion battery u201d when the compound u03b3 liv 2 o 5 obtained by the process of the invention is used for the preparation of the positive electrode of such a battery the battery is in the charged state a battery according to the invention comprising a solid electrolyte can be provided in the form of a succession of layers composed respectively of the material of the positive electrode according to the invention and its current collector the solid electrolyte and the negative electrode and optionally its current collector a battery according to the invention comprising a liquid electrolyte can also be provided in the form of a succession of layers composed respectively of the material of the positive electrode according to the.