Abstract: The hydration of cadmium oxide in the presence of nickel acetate gives the possibility of obtaining a compound of general formula Cd1-xNix(OH)2-y(CH3CO2)y with 0<x?0.05 and 0<y?0.10. This compound may be advantageously, used as an electrochemically active material of an anode of the envelope type of a nickel cadmium generator. This anode does not contain any sulfates responsible for the formation of short-circuits. Further, this anode has a high electrochemical yield. A method for preparing this compound and the anode is described.

Abstract: An alloy comprising tin, silicon and carbon, and containing a crystalline M-Sn phase, M being an inert metal. An alloy comprising tin and silicon, comprising: a) a nanocrystalline phase containing at least 50 at. % of the element silicon Si°; b) a nanocrystalline phase containing a compound based on tin; c) a nanocrystalline phase constituted by the element tin Sn°. A manufacturing process for this alloy.

Abstract: The hydration of cadmium oxide in the presence of nickel acetate gives the possibility of obtaining a compound of general formula Cd1-xNix(OH)2-y(CH3CO2)y with 0<x?0.05 and 0<y?0.10. This compound may be advantageously, used as an electrochemically active material of an anode of the envelope type of a nickel cadmium generator. This anode does not contain any sulfates responsible for the formation of short-circuits. Further, this anode has a high electrochemical yield. A method for preparing this compound and the anode is described.

Abstract: An alloy comprising tin, silicon and carbon, and containing a crystalline M-Sn phase, M being an inert metal. An alloy comprising tin and silicon, comprising: a) a nanocrystalline phase containing at least 50 at. % of the element silicon Si°; b) a nanocrystalline phase containing a compound based on tin; c) a nanocrystalline phase constituted by the element tin Sn°. A manufacturing process for this alloy.

Abstract: A compound for use as active material of a positive electrode of a lithium-ion cell. This compound has an average discharge voltage above 4.5V in relation to the Li+/Li couple of approximately 4.7V. The compound includes: a) a spinel-type crystalline phase of formula LiaNiII0.5?xMnIII2xMnIV1.5?x?yMyO4 in which elements Ti and Al, or a mixture of these; 0.8<a<1.3; 0<x?0.15; 0<y?0.15; b) a cubic crystalline phase of formula Li1?tNi1+tO in which 0?t?1; and c) a rhomboedric crystalline phase of formula Li1?ZNi1+zO2 in which 0?z?1.

Abstract: The invention proposes a compound for use as active material of a positive electrode of a lithium-ion cell. This compound has an average discharge voltage above 4.5V in relation to the Li+/Li couple of approximately 4.7V. This compound comprises: a) a spinel-type crystalline phase of formula LiaNiII0.5?xMnIII2xMnIV1.5?x?yMyO4 in which M is chosen from the group comprising the elements Ti and Al, or a mixture of these; 0.8<a<1.3; 0<x?0.15; 0<y?0.15; b) a cubic crystalline phase of formula Li1?zNi1+zO2 in which 0?z?1; and c) a rhomboedric crystalline phase of formula Li1?zNi1+zO2 in which 0?z?1. The invention also provides an electrode, a cell with this compound and a production process.

Abstract: An electrochemically active material resulting from substituting a portion of the nickel in a single-phase composite oxide of nickel and lithium of the LiNiO2 type, characterized in that the active material satisfies the formula: Li(M1(1-a-b-c)LiaM2bM3c)O2 in which: 0.02<a?0.25; 0?b<0.30; 0?c<0.30; (a+b+c)<0.50; M3 is at least one element selected from Al, B, and Ga; M2 is at least one element selected from Mg and Zn; and M1=Ni(1-x-y-z)CoxMnyM4z in which M4 is at least one element selected from Fe, Cu, Ti, Zr, V, Ga, and Si; and 0?x<0.70; 0.10?y<0.55; 0?z<0.30; and 0.20<(1-x-y-z); b+c+z>0; and in that said active material, regardless of its state of charge, satisfies the relationship: 0.40<R<0.90, where: R=(1-a-b-c)*[3-[(nU/nMA+dox)/(4-2b-3c)]*(2-b-2c)] in which: nU is the lithium content expressed in moles; nMA is the sum of the contents of Ni, Mn, Co, and M4 expressed in moles; and dox is the overall degree of oxidation of M1.

Abstract: The present invention provides an electrochemically active material resulting from substituting a portion of the nickel in a single-phase composite oxide of nickel and lithium of the LiNiO2 type, characterized in that the active material satisfies the formula: Li(M1(1-a-b-c)LiaM2bM3c)O2 in which: 0.02<a?0.25; 0?b<0.30; 0?c<0.30; (a+b+c)<0.50; M3 is at least one element selected from Al, B, and Ga; M2 is at least one element selected from Mg and Zn; and M1=Ni(1-x-y-a)CoxMnyM4z in which M4 is at least one element selected from Fe, Cu, Ti, Zr, V, Ga, and Si; and 0?x<0.70 0.10?y<0.55 0?z<0.30 0.20<(1-x-y-z) b+c+z>0; and in that said active material, regardless of its state of charge, satisfies the following relationship: 0.40<R<0.90 where: R=(1-a-b-c)*[3-[(nU/nMA+dox)/(4-2b-3c)]*(2-b-2c) in which: nU is the lithium content expressed in moles; nMA is the sum of the contents of Ni, Mn, Co, and M4 expressed in moles; and dox is the overall degree of oxidation of M1.

Abstract: The present invention provides an electrochemically active material resulting from substituting a portion of the nickel in a combined nickel and lithium oxide of the LiNiO2 type that crystallizes into a rhombohedral structure and that satisfies the formula: Li (Ni(1-x-y-z-t)CoxMnyLizMt)O2-eFe where: 0?x<0.70 0.05<y?0.50 0?z?0.20 0?t?0.30 0.01<e?0.50 0.20?(1-x-y-z-t) and in which M is at least one element from Mg, Al, B, Ti, Si, Zr, Fe, Zn, and Cu.

Abstract: The present invention provides a lithium insertion compound suitable for operating at a voltage greater than 4.

Abstract: An electrode conductive material includes a non-stoichiometric oxidized cobalt compound whose electrical conductivity is greater than 5×10−3 S/cm and which has a direct spinel structure and formula Co2+xCo3+yO4, with 0.73≦≦0.80 and 1.87≦y≦1.95. An alkaline electrolyte secondary storage cell positive electrode includes a current collector and a layer containing a binder, particles of an electrochemically active material and the aforementioned conductive material, the proportion by weight of the conductive material in the layer being from 4% to 10% of the active material.

Abstract: A non-sintered nickel electrode for alkaline electrolyte storage cells including a current collector and a paste containing an active material based on nickel hydroxide and a conductive material, wherein said conductive material is a lithium-containing cobalt and nickel oxide whose degree of oxidation obtained after electrochemical conditioning is stable after prolonged storage in the alkaline electrolyte.

Abstract: A pasted nickel electrode for a storage cell having an alkaline electrolyte, the electrode comprising a current collector and an active mass based on nickel hydroxide in powder form together with a carbon-based conductor, the electrode being characterized by the fact that said carbon-based conductor is made up of particles of carbon that withstand electrochemical oxidation and that satisfy the following relationship: W>0.025 in units of 109 g/m, where W=TC002/S×G, where TC002 is the size of the [002] crystallite on the X-ray diffraction pattern expressed in nanometers; S is the specific surface area of the particles expressed in m2/g; G is the graphitization coefficient of the carbon defined as follows: G=(d002−0.3354)/(0.3450−0.3354) d002 is the lattice constant in the 002 direction in nanometers.

Abstract: The present invention concerns a nickel electrode comprising a nickel-based hydroxide which satisfies at least one of the following criteria:an intensity ratio of the ?103! line to the ?200! line in the X-ray diffraction diagram of 1.05.+-.0.10;a coherence length L of 13.+-.3 nm,a ratio of the sum of the surface areas of the peaks at 3687.+-.10 cm.sup.-1 and 3600.+-.10 cm.sup.-1 to the surface area of the peak at 3580.+-.10 cm.sup.-1 of the Raman spectrum of 0.11.+-.0.03;a ratio of the surface area of the peak at 511.+-.10 cm.sup.-1 to the surface area of the peak at 460.+-.10 cm.sup.-1 in the Raman spectrum of 1.1.+-.0.1.

Abstract: A method of preparing a powder of YBaCuO [phase 123] suitable for forming by drawing-lamination, which includes:preparing a powdered reactive mixture of precursors of purity greater than 99% and with a stoichiometry accurate to within less than 1%,binding this powdered reactive mixture to form intermediate pieces less than two millimeters in thickness which are placed in an oven so that their contact with a support is as small as possible,a heat treating the intermediate pieces,dry grinding the intermediate pieces to obtain grains of said powder with an average diameter of the order of a few .mu.m.

Abstract: In this invention, according to a first embodiment, the collector part of the electrode is formed by a full plate on which are deposited longitudinal strips of polytetrafluorethylene before the depositing of the electrochemically active part. In a second embodiment, the collector part is formed by a grid which is coated, before the depositing of the electrochemically active part, with a zinc oxide paste and polytetrafluorethylene In this way, one or more spaces are provided between the collector part and the electrochemically active part, the result thus being that the gases given off by the reactional process may escape easily by following the space(s), thus avoiding any deformation of the electrode.