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 a lithium rechargeable electrochemical cell containing a liquid electrolyte and an electrochemically active material for the positive electrode, wherein said active material comprises a mixture of: I) a composite oxide of lithium and at least one transition metal selected from Ni and Co, which is also substituted by an element selected from Mg, Al, B, Ti, Si, Zr, Fe, Zn, and Cu; and II) a composite oxide of phosphorus, lithium, and at least one transition metal of general formula LitM2zPO4 where 0<t<3 and z=1 or 2, and such that the content of the composite oxide of phosphorus, lithium, and at least one transition metal lies in the range 1% to 50% of the weight of said mixture.

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: The invention concerns an anode for a rechargeable lithium cell, comprising a conductive support and a paste containing an electrochemically active material into which lithium can be inserted and a polymer binder, the anode being characterized in that the binder is selected from polyvinyl alcohol, polyvinyl butyral, and copolymers and mixtures thereof.

Abstract: The present invention concerns a rechargeable lithium electrochemical cell comprising an anode containing a carbon-containing material with a degree of crystallinity which is greater than 0.8 and an electrolyte comprising a lithium salt and a mixture of at least two aprotic organic solvents, of which the first solvent has a high dielectric constant and the second solvent has low viscosity. The electrolyte further contains a soluble compound of the same type as at least one of said solvents and contains at least one unsaturated bond, and which can be reduced at the anode at a potential of more than 1 volt with respect to lithium to form a passivation layer.

Abstract: A rechargeable electrochemical cell comprising a cathode, a liquid electrolyte with a solute and at least one solvent, an anode containing a highly crystallized carbon-containing material capable of intercalating lithium ions, said electrochemical cell being characterized by the fact that the surface of said carbon-containing material is provided with a thin layer which is impermeable to said electrolyte solvent, but which allows lithium to be diffused.

Abstract: A rechargeable electrochemical cell comprising a cathode, an anode based on a carbon-containing material capable of intercalating lithium ions, and an electrolyte constituted by a cross-linked polymer incorporating a lithium salt and a dipolar aprotic solvent. At least the surface of the carbon-containing material is less crystallized than graphite so as to be impermeable to said solvent, while allowing the lithium to diffuse.

Abstract: A cross-linked polymer solid electrolyte of a polyether having amine functions cross-linked by a curing compound including two epoxy functions, and thereby defining a three-dimensional lattice which complexes an ionizable salt of the formula M.sup.+ X.sup.-, where M.sup.+ is selected from Li.sup.+, Na.sup.+, K.sup.+, Ca.sup.2+, and NH.sup.4+, and X.sup.- is selected from ClO.sub.4.sup.-, CF.sub.3 SO.sub.3.sup.-, SCN.sup.-, BF.sub.4.sup.-, I.sup.-, Br.sup.-, N.sub.3.sup.-, BH.sub.4.sup.-, CF.sub.3 CO.sub.3.sup.-, AsF.sub.6.sup.-, and PF.sub.6.sup.-, the proportion by weight of salt in the electrolyte lying in the range 5% to 40%.