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 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: The invention relates to a diazonium aryl salt devoid of hydroxyl functions of the following general formula (1): X?+N?N-A-R1—(OR2)n—O—R4-A?-N?N+X???(1) in which: n is an integer comprised between 1 and 10, preferably between 1 and 4, X— represents a counter-ion of the diazonium cation chosen from the halogenides, BF4-, NO3-, HSO4-, PF6-, CH3COO—, N(SO2CF3)2-, CF3SO3-, CH3SO3-, CF3COO—, (CH3O)(H)PO2-, N(CN)2-, R1, R2 and R4 are identical or different and chosen independently from the group formed by —CH2-, a cyclic or acyclic, linear or branched alkyl chain and, A? and A? are identical or different and independently represent a mono or polycyclic, aromatic hydrocarbonated group chosen from the group formed by phenyl, aryl groups, condensed polyaromatic groups, which may be substituted.

Abstract: An electrochemical generator includes a first electrode covered by a passivation layer having a compound formed by repetition of a pattern of the following formula (7): in which: n is an integer comprised between 1 and 10, preferably between 1 and 4; R1 and R2 are identical or different and chosen independently from the group formed by —CH2—, a cyclic or acyclic, linear or branched alkyl chain; R3 is chosen from the group formed by —CH3, a cyclic or acyclic, linear or branched alkyl chain, and a group of the following formula (8): in which: N is a mono or polycyclic, aromatic hydrocarbonated group chosen from the group formed by phenyl, aryl groups, condensed polyaromatic groups, which may be substituted; R4 is chosen from the group formed by —CH2-, a cyclic or acyclic, linear or branched alkyl chain; and A is identical to or different from A?.

Abstract: Double pole battery comprising three electrochemical cells stacked along a longitudinal axis, each cell consisting of an anode, a cathode and an electrolyte placed between the anode and the cathode, a current collector plate electrically connecting an anode of a cell and a cathode of an adjacent cell, a current collector plate on the anode of a cell located at a first longitudinal end of the stack, a current collector plate on the cathode located at a second longitudinal end of the stack, an electrolyte-proof lateral wall surrounding each cell between each pair of successive collector plates, wherein the lateral walls of two adjacent cells are offset transversely one relative to the other relative to the longitudinal axis, in such a way they are not superposed one on the other.

Abstract: The invention relates to an electrochemical lithium accumulator comprising at least one first electrochemical cell and at least one second electrochemical cell separated from each other by a current-collecting substrate, which substrate supports on a first face, an electrode of said first electrochemical cell, and on its second face opposite to said first face, an electrode of opposite sign of said second electrochemical cell, each cell comprising a positive electrode and a negative electrode separated by an electrolyte, characterized inter alio in that said current-collecting substrate is in copper or in copper alloy.

Abstract: The invention relates to lithium-bearing iron phosphate in the form of micrometric mixed aggregates of nanometric particles, to an electrode and cell resulting therefrom and to the method for manufacturing same, which is characterized by a nanomilling step.

Abstract: An electrochemical generator comprising a first type of electrochemical cell, a so-called <<high energy>> cell and a second type of electrochemical cell a so-called <<safety>> cell is provided.

Abstract: A Lithium-ion storage battery includes: LiFePO4 as active material for a positive electrode, an active material for a negative electrode having a lithium insertion/extraction potential equal to or greater than 0.5 V vs. Li+/Li, chosen from a lithiated titanium oxide, a derivative of a lithiated titanium oxide, a non lithiated titanium oxide, a derivative of a non lithiated titanium oxide and a mixture thereof, and a separating element placed between the positive and negative electrodes, formed from a non-woven fabric containing fibers of nanometric and/or micrometric size, chosen from cellulose fibers and glass fibers.

Abstract: The method for determining the state of charge of a battery can be used during charging or discharging of the battery at constant current. It comprises placing the battery in open circuit during a recovery period until the voltage at the terminals of said battery stabilizes at a voltage plateau. Then a constant test voltage is applied to the battery terminals during a preset test period. The state of charge of the battery corresponds to the current measured at the end of the test period by means of a previously obtained calibration curve.

Abstract: The invention relates to a process for manufacturing a silicon-based electrode and to a silicon-based electrode. It also relates to a lithium battery comprising such an electrode. The process of the invention consists in fabricating a silicon-based electrode of the type that includes a step of electrochemically depositing silicon on a substrate by cyclic voltammetry in a solution comprising at least one ionic liquid and a silicon precursor of formula SinX2n+2, in which x is Cl, Br or I and n is equal to 1 or 2. The electrode of the invention is particularly applicable in the lithium battery field.

Abstract: The invention relates to a positive electrode/electrolyte pair for lithium batteries operating at a voltage above 4.2 V versus Li+/Li. The electrolyte of the lithium battery used in the invention includes at least a first additive chosen from optionally substituted, cyclic or acyclic, carboxylic or dicarboxylic anhydrides and carboxylic or dicarboxylic acids, and mixtures thereof, and optionally a second additive which is a lithium salt, the total content of additive(s) being greater than or equal to 0.01% by weight and less than or equal to 30% by weight, relative to the total weight of electrolyte, and the positive electrode is made of a material having a spinel structure. The lithium batteries of the invention are applicable in particular in the field of portable equipment, such as telephones, computers, camcorders, cameras and tooling.

Abstract: The invention relates to a lithium battery, comprising at least one lithium intercalation compound, made up of crystallites and obtained by a production method, comprising at least the following steps: formation of a homogeneous mixture of at least one precursor for the lithium intercalation compound with a given adjunct, chemically stable with relation to crystallites and designed to limit the growth of crystallites or crystallite precursors during the formation thereof, thermal treatment of the homogeneous mixture for the synthesis of the lithium intercalation compound in the form of crystallites and to give a composite material comprising at least two phases formed respectively by the lithium intercalation compound and the adjunct and forming of the composite material to give said electrode. The invention further relates to an electrode obtained by said method and lithium battery comprising such an electrode.

Abstract: A lithium battery comprises at least a positive electrode containing a material whose lithium insertion and deinsertion potential is lower than or equal to 3.5 Volts in relation to the potential of the Li+/Li couple, a negative electrode and a non-aqueous electrolyte disposed between the positive and negative electrodes. The electrolyte comprises at least a lithium salt dissolved in an aprotic organic solvent wherein a polymerizable additive is added, chosen from carbazol and the derivatives thereof and being used to prevent the battery from operating as soon as the voltage at the terminal connections of the battery reaches a value resulting in polymerization of the additive.

Abstract: The present invention relates to a method for charging a lithium-ion accumulator with a negative electrode at an operating potential larger than 0.5 volts relatively to the Li+/Li pair, which comprises a first charging step at a constant voltage between 2 volts and 5 volts.

Abstract: The method for determining the state of charge of a battery can be used during charging or discharging of the battery at constant current. It comprises placing the battery in open circuit during a recovery period until the voltage at the terminals of said battery stabilizes at a voltage plateau. Then a constant test voltage is applied to the battery terminals during a preset test period. The state of charge of the battery corresponds to the current measured at the end of the test period by means of a previously obtained calibration curve.

Abstract: A separator for a battery in lithium. The separator is a thick membrane, of around 60 to 120 ?m in polyvinylidene fluoride copolymer, which has considerable porosity, of around 50 to 90%, with pores of size between 1 and 10 ?m. With these characteristics, it is possible to optimize the operation of a battery with an electrode in, e.g., Li4Ti5O12, in particular for rapid charges and discharges, in other words in power applications.

Abstract: Double pole battery comprising three electrochemical cells stacked along a longitudinal axis, each cell consisting of an anode, a cathode and an electrolyte placed between the anode and the cathode, a current collector plate electrically connecting an anode of a cell and a cathode of an adjacent cell, a current collector plate on the anode of a cell located at a first longitudinal end of the stack, a current collector plate on the cathode located at a second longitudinal end of the stack, an electrolyte-proof lateral wall surrounding each cell between each pair of successive collector plates, wherein the lateral walls of two adjacent cells are offset transversely one relative to the other relative to the longitudinal axis, in such a way they are not superposed one on the other.

Abstract: The invention relates to a lithium battery including a cell comprising: a positive electrode, a negative electrode, and an electrolyte consisting of an aqueous solution of a lithium salt, characterized in that the electrolyte has a pH of at least 14, the positive electrode has a lithium intercalation potential greater than 3.4 V, and the negative electrode has a lithium intercalation potential less than 2.2 V.

Abstract: The present invention relates to a method for charging a lithium-ion accumulator with a negative electrode at an operating potential larger than 0.5 volts relatively to the Li+/Li pair, which comprises a first charging step at a constant voltage between 2 volts and 5 volts.

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.