Abstract: An electrical voltage-generating piezoelectric device comprising at least a first blade (1) with a curved portion (10) defining a first arm (11) and a second arm (12) of the blade, the first arm (11) being intended to be fastened to a fixed support, the second arm (12) being substantially flat and having a free end (120) designed to oscillate around its resting position under the effect of mechanical force, at least one piezoelectric element (31) resting upon one of the main surfaces (14) of the second arm (12) of the first blade. The device also includes a second blade (2) identical in structure to the first blade (1), the first arms (11, 21) of the first and second blades (1, 2) being fastened together on all or part of their surfaces and being fixed relative to each other.

Abstract: A lithium-ion accumulator successively includes a first current collector; a negative electrode in contact with the first current collector; an electrode separator comprising an electrolyte, in contact with the negative electrode; a positive electrode in contact with the electrode separator; and a second current collector in contact with the positive electrode. The second current collector is made of aluminum covalently grafted with at least one phenyl aromatic group C6(Ri)5, in which formula: Ri designates R1, R2, R3, R4 and R5 which are independently from one another selected from the group including: C(?O)O—Y+; SO3?Y+; CH2—SO3?Y+; NR3+X?; OH; PO3H?Y+; H; F; CnF2n+1; CnH2n+1; NO2; —O—CH2—O—; imidazole groups; and derivatives of imidazole groups; with Y?H, Na, K, Li, NR?4; X?F, Cl, Br, I; n being an integer in the range from 1 to 10; R?CmH2m+1; R??H, CmH2m+1 and mixtures thereof, m being an integer in the range from 1 to 10; at least two groups Ri being different from H.

Abstract: The invention relates to an electrochemical cell for a lithium-ion battery comprising: a negative electrode comprising as an active material silicon; a positive electrode; and an electrolyte positioned between said negative electrode and said positive electrode, said electrolyte comprising at least one lithium salt, at least one carbonate solvent, at least one mononitrile compound and at least one compound fitting at least one of the following formulae (I) and (II): wherein R1 and R2 represent, independently of each other, H, Cl or F, provided that R1 and R2 do not both represent H.

Abstract: A method for detecting and dosing hydrofluoric acid content of an electrolyte containing lithium hexafluorophosphate LiPF6 in lithium batteries, including measuring a variation in weight of a material that can undergo a surface reaction with the hydrofluoric acid in the electrolyte, the variation being determined by a quartz microbalance.

Abstract: A lithium-ion accumulator successively includes a first current collector; a negative electrode in contact with the first current collector; an electrode separator comprising an electrolyte, in contact with the negative electrode; a positive electrode in contact with the electrode separator; and a second current collector in contact with the positive electrode. The second current collector is made of aluminum covalently grafted with at least one phenyl aromatic group C6(Ri)5, in which formula: Ri designates R1, R2, R3, R4 and R5 which are independently from one another selected from the group including: C(?O)O—Y+; SO3?Y+; CH2—SO3?Y+; NR3+X?; OH; PO3H?Y+; H; F; CnF2n+1; CnH2n+1; NO2; —O—CH2—O—; imidazole groups; and derivatives of imidazole groups; with Y?H, Na, K, Li, NR?4; X?F, Cl, Br, I; n being an integer in the range from 1 to 10; R?CmH2m+1; R??H, CmH2m+1 and mixtures thereof, m being an integer in the range from 1 to 10; at least two groups Ri being different from H.

Abstract: An electrical voltage-generating piezoelectric device comprising at least a first blade (1) with a curved portion (10) defining a first arm (11) and a second arm (12) of the blade, the first arm (11) being intended to be fastened to a fixed support, the second arm (12) being substantially flat and having a free end (120) designed to oscillate around its resting position under the effect of mechanical force, at least one piezoelectric element (31) resting upon one of the main surfaces (14) of the second arm (12) of the first blade. The device also includes a second blade (2) identical in structure to the first blade (1), the first arms (11, 21) of the first and second blades (1, 2) being fastened together on all or part of their surfaces and being fixed relative to each other.

Abstract: The invention relates to lithium batteries comprising at least one electrochemical cell comprising an electrolyte conducting lithium ions comprising at least one sulfone solvent, at least one additive selected from among anhydride compounds and at least one lithium salt, which electrolyte is positioned between a positive electrode comprising, as an active material, a lithiated oxide of formula LiNi0.4Mn1.6O4 or LiNi0.5Mn1.5O4 and a negative electrode comprising, as an active material, Li4Ti5O12.

Abstract: The invention relates to an electrochemical cell for a lithium-ion battery comprising: a negative electrode comprising as an active material silicon; a positive electrode; and an electrolyte positioned between said negative electrode and said positive electrode, said electrolyte comprising at least one lithium salt, at least one carbonate solvent, at least one mononitrile compound and at least one compound fitting at least one of the following formulae (I) and (II): wherein R1 and R2 represent, independently of each other, H, Cl or F, provided that R1 and R2 do not both represent H.

Abstract: The present invention relates to a method for preparing particles intended to be used, as active materials, within a composite electrode for lithium batteries, which are coated with at least one layer of oxide, preferably a layer of metal oxide covering only the areas which are capable of being more reactive with an electrolyte based on lithium hexafluorophosphate LiPF6.

Abstract: A method for detecting and dosing hydrofluoric acid content of an electrolyte containing lithium hexafluorophosphate LiPF6 in lithium batteries, including measuring a variation in weight of a material that can undergo a surface reaction with the hydrofluoric acid in the electrolyte, the variation being determined by a quartz microbalance.

Abstract: A lithium-air storage battery having at least one electrochemical cell with a negative electrode, which is an air electrode; a positive electrode, which comprises a material for insertion of lithium; and an organic electrolyte conducting lithium ions, positioned between the negative electrode and positive electrode, the electrolyte not degrading, when it is subject to a voltage ranging from 3V to 5.5V expressed relatively to the Li+/Li pair and the storage battery having a potential difference between the electrochemical potential of the positive electrode and the electrochemical potential of the negative electrode greater than 4.5V expressed relatively to the Li+/Li pair.

Abstract: A piezoelectric device for generating a voltage, comprising a vibratory blade with a first end secured to a fixed substrate and a second, free end which can be moved by applying a mechanical pulse thereon. At least one separate piezoelectric element is provided on one side of blade in such a way that it is deformed by the oscillation of the blade following the application of said mechanical pulse, and thereby generates a voltage. The device is characterized in that the blade is generally U shaped and has two substantially planar arms joined together via a curved intermediate portion. A first arm is secured to the substrate and a second arm has the free end.

Abstract: A piezoelectric device for generating an electrical voltage, comprises a vibrating plate having a portion integral with a fixed support and at least one free end capable of moving under the effect of a mechanical pulse, and at least one piezoelectric element attached to one face of the plate so as to deform under the effect of the oscillations of the plate that result from said mechanical pulse, thus generating an electrical voltage. The plate has a U-shaped or V-shaped general configuration, possessing two substantially planar branches joined by a curved linking portion integral with the support.

Abstract: A piezoelectric device for generating an electrical voltage, comprises a vibrating plate having a portion integral with a fixed support and at least one free end capable of moving under the effect of a mechanical pulse, and at least one piezoelectric element attached to one face of the plate so as to deform under the effect of the oscillations of the plate that result from said mechanical pulse, thus generating an electrical voltage. The plate has a U-shaped or V-shaped general configuration, possessing two substantially planar branches joined by a curved linking portion integral with the support.

Abstract: A piezoelectric device for generating a voltage, comprising a vibratory blade with a first end secured to a fixed substrate and a second, free end which can be moved by applying a mechanical pulse thereon. At least one separate piezoelectric element is provided on one side of blade in such a way that it is deformed by the oscillation of the blade following the application of said mechanical pulse, and thereby generates a voltage. The device is characterised in that the blade is generally U shaped and has two substantially planar arms joined together via a curved intermediate portion. A first arm is secured to the substrate and a second arm has the free end.