Abstract: A microbattery comprises, in the form of thin layers, at least first and second electrodes between which a solid electrolyte is disposed. The first electrode and the electrolyte both comprise at least one common grouping of [XY1Y2Y3Y4] type, where X is located in a tetrahedron whose peaks are respectively formed by the chemical elements Y1, Y2, Y3 and Y4, the chemical element X being selected from the group consisting of phosphorus, boron, silicon, sulphur, molybdenum, vanadium and germanium and the chemical elements Y1, Y2, Y3 and Y4 being selected from the group consisting of sulphur, oxygen, fluorine and chlorine.

Abstract: Process for the preparation of an insertion compound of an alkali metal in which the following successive stages are carried out: a) an organic complex of a transition metal or of a mixture of transition metals M in an oxidation state of greater than 2 is brought into contact with an alkali metal A in the ionic form and with an entity of formula Hb (XO4), where X is chosen from Si, S, Al, P, Ge, As or Mo and b has a value from 0 to 5, in a liquid medium in a closed chamber; the chamber is brought to a temperature T which makes possible the decomposition of the organic complex in the the said liquid medium; the temperature and the pressure in the chamber are brought back to ambient temperature and atmospheric pressure and the insertion compound for an alkali metal of formula AMXO4, in which M is in the +2 oxidation state, is recovered.

Abstract: Lithium insertion compound having the following formula (I): Li?M?M1vM2wM3xM4yM5zB?(XO4??Z?)1??(I) M is selected from V2+, Mn2+, Fe2+, Co2+ and Ni2+; M1 is selected from Na+ and K+; M2 is selected from Mg2+, Zn2+, Cu2+, Ti2+, and Ca2+; M3 is selected from Al3+, Ti3+, Cr3+, Fe3+, Mn3+, Ga3+, and V3+; M4 is selected from Ti4+, Ge4+, Sn4+, V4+, and Zr4+; M5 is selected from V5+, Nb5+, and Ta5+; X is an element in oxidation state m, exclusively occupying a tetrahedral site and coordinated by oxygen or a halogen, which is selected from B3+, Al3+, V5+, Si4+, P5+, S6+, Ge4+ and mixtures thereof; Z is a halogen selected from F, Cl, Br and I; the coefficients ?, ?, v, w, x, y, z, ? and ? are all positive and satisfy the following equations: 0???2??(1) 1???2??(2); 0<???(3); 0???2??(3); 0???2??(4); ?+2?+3?+v+2w+3x+4y+5z+m=8????(5); and 0 < ? ? + v + w + x + y + z ? 0.1 , preferably, 0 < ? ? + v + w + x + y + z ? 0.05 . Methods for preparing these compounds.

Abstract: A lithium storage cell comprises at least a first electrode comprising an active material wherein Li+ cations can be inserted, a second electrode and an electrolyte. The active material of the first electrode comprises a linear condensed compound comprising at least two tetrahedra, respectively of AO4 and A?O4 type, bonded by a common oxygen atom. A transition metal ion M2+ with a degree of oxidation of +2 selected from the group consisting of Ni2+, Co2+, Mn2+, Fe2+ and Ti2+ is inserted in the linear condensed compound, and the ratio between the number of Li+ cations able to be inserted in the active material and the number of transition metal ions M2+ is strictly greater than 1. A and A? are selected from the group consisting of P5+, Si4+, Al3+, S6+, Ge4+, B3+.

Abstract: The subject of the present invention is a lithium electrochemical generator comprising two peripheral electrodes—one positive and the other negative—each comprising an electrically conductive substrate (13, 21) and an active layer (14, 20) that includes an active material, at least one bipolar electrode comprising a positive active layer (18) on a first electrically conductive substrate and a negative active layer (16) on a second electrically conductive substrate, the said substrates being fixed together and two separators (15, 19) flanking each bipolar electrode, in which generator the electrically conductive substrates of each bipolar electrode are made of identical or different materials chosen from aluminium and its alloys and the negative active material of the bipolar electrode prevents an aluminium alloy being obtained with the electrically conductive substrates, under the operating conditions of the storage battery.

Abstract: This invention relates to a process for manufacturing a lithiated or overlithiated transition metal oxide comprising the following three steps, carried out successively or in a simultaneous manner: preparation of a solution of lithium alkoxide by dissolving lithium metal in an alcohol, the said alcohol being chosen among the alcohols originating from linear or ramified alkanes comprising at least three carbon atoms, the alcohols originating from unsaturated aliphatic hydrocarbides, and mixtures of them; addition of a transition metal oxide powder to the said lithium alkoxide solution to obtain a dispersion; controlled reduction of the said transition metal oxide by the said alkoxide to obtain a lithiated or overlithiated transition metal oxide with a defined Li:Metal stoichiometry; the said process also comprising the following steps: evaporation of the residual alcohol, rinsing of the powder thus obtained, drying of the powder.

Abstract: The invention relates to the preparation of insertion compounds based on manganese oxide, usable as the positive electrode active material in a lithium battery.These compounds in the hatched area of FIG. 1 can be prepared by reacting in the solid state a manganese oxide powder MnO.sub.2 -.beta., having a specific surface below 7 m.sup.2 /g and an average grain size below 10 .mu.m, with a powder of a lithium compound such as Li.sub.2 CO.sub.3 or LiOH, at a temperature of 150.degree. to 500.degree. C. for an adequate time to convert the .beta.-MnO.sub.2 into manganese and lithium oxide having a lacunary or stoichiometric spinel structure.