Abstract: A process for preparing a compound of formula (NaOH)x[Fe(OH)2]yFeS, may include: (a) mixing iron and sodium sulfide in equimolar amounts, in an NaOH aqueous solution; (b) heating the obtained mixture up to a temperature in a range of from 110 to 210° C. for a duration in a range of from 1 hour to 1 week; and (c) recovering the active material by filtering and drying in a neutral atmosphere.

Abstract: A negative electrode active material for a lithium-ion battery has the following formula (I): Li1-xOHFe1+xS (I). x varies from 0.00 to 0.25, preferably from 0.05 to 0.20.

Abstract: A Li-ion battery cell includes cathode and anode materials, a separator, and an electrolyte including a mixture of a polyethylene oxide and an oxide of formula LivLasZnOn. A method of forming the cell includes the following successive cycling steps: (a) at least two successive charge and discharge cycles of the cell at a first cycling rate C/x, the charge/discharge steps being limited in time to x/2; (b) at least two successive charge and discharge cycles of the cell at a second charging rate C/y, different from the first cycling rate, where y is lower than x, the charge/discharge steps being limited in time to y/2; and (c) at least two successive charge and discharge cycles of the cell at a third cycling rate C/z different from the first and second charging rates, where z is lower than x and y, the charge/discharge steps being limited in time to z/2.

Abstract: A method for preparing a solid electrolyte is described. The method involves mixing a solid electrolyte selected from among sulfides with an agent comprising at least sulfur, adding the mixture obtained to an organic solvent, and then recovering the resulting solid electrolyte. The method may be used to form the solid electrolyte as a separator for a battery cell.

Abstract: A solid lithium cell is formed by stacking an etched copper substrate, a layer of graphite, an electrolyte, and a layer of nickel, manganese, and cobalt oxides. The electrolyte is in contact with the graphite layer and the layer of nickel, manganese, and cobalt oxides. The copper substrate forms the anode of the cell. The layer of nickel, manganese and cobalt oxides forms the cathode of the cell. The electrolyte is a solid lithium-based electrolyte. The graphite layer has a first solid electrolyte interface produced during a pre-lithiation with a liquid lithium-based electrolyte and a second solid electrolyte interface produced during a pre-lithiation with the solid lithium-based electrolyte.

Abstract: A Li-ion battery cell includes cathode and anode materials, a separator, and an electrolyte including a mixture of a polyethylene oxide and an oxide of formula LivLasZnOn. A method of forming the cell includes the following successive cycling steps: (a) at least two successive charge and discharge cycles of the cell at a first cycling rate C/x, the charge/discharge steps being limited in time to x/2; (b) at least two successive charge and discharge cycles of the cell at a second charging rate C/y, different from the first cycling rate, where y is lower than x, the charge/discharge steps being limited in time to y/2; and (c) at least two successive charge and discharge cycles of the cell at a third cycling rate C/z different from the first and second charging rates, where z is lower than x and y, the charge/discharge steps being limited in time to z/2.

Abstract: A negative electrode active material for a lithium-ion battery has the following formula (I): Li1-xOHFe1+xS (I). x varies from 0.00 to 0.25, preferably from 0.05 to 0.20.

Abstract: A positive electrode active material for a sodium-ion battery has the following formula: NaxNi0.5-yCuyMn0.5-zTizO2, in which: -x varies from 0.9 to 1; -y varies from 0.05 to 0.1; -z varies from 0.1 to 0.3. When z is equal to 0.1 and x is equal to 1, then y is not equal to 0.05.

Abstract: The invention deals with a method of preparing a lithium-ion accumulator comprising a positive electrode and a negative electrode which are disposed on either side of an electrolyte, the positive electrode comprising, as active material, a lithium-based material, a method comprising the following steps: a) a step of depositing lithium salt on the surface of the positive electrode, before placement in the accumulator; b) a step of assembling the positive electrode, the negative electrode and the electrolyte; and c) a step of forming a passivation layer on the surface of the negative electrode with the lithium ions arising from the decomposition of the lithium salt by applying a first charge to the abovementioned assembly.

Abstract: A method for forming a cell of a lithium-ion battery comprising a material for a positive electrode having a pore ratio of between 20 and 35% and comprising at least one sacrificial salt, a material for a negative electrode, a separator and an electrolyte, comprising the following successive steps: (a) heating the cell to a temperature T of between 30 and 45° C.; and (b) charging the cell to a potential lower than or equal to 4.8 V, preferably between 4.6 and 4.8 V, even more preferably between 4.7 and 4.8 V.

Abstract: A composite electrode material is based on graphitic carbon and includes a ground product, dispersed within the graphitic carbon, of an intimate mixture of carbon fibers and silicon. The composite electrode material can be included in an electrode for electrical energy storage batteries along with one or more binders. The electrode is prepared by mechanically grinding carbon fibers and silicon particles in the presence of a solvent, drying the mixture until the solvent has disappeared completely, adding the dried ground product to the particles of graphitic carbon, mixing the whole in the presence of at least one binder, spreading the mixture on a current collector, and then drying.

Abstract: A method for manufacturing a composite material including tin oxide particles and a fibrillar carbon material, including synthesising tin hydroxide particles obtained from a tin salt by precipitation/nucleation in a water-alcohol medium, in the presence of the fibrillar carbon material and an acid, the fibrillar carbon material being nanotubes, carbon nanofibres, or a mixture of the two. The method can be used for the production of negative electrodes for lithium-ion batteries.