Abstract: An electrolyte composition including at least one sodium salt dissolved in a solvent and a combination of additives, wherein: the solvent includes at least one compound selected from the group consisting of ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, propylene carbonate, a carboxylate ester such as methyl acetate, ethyl acetate, ethyl propionate and methyl propionate, 4-fluorotoluene, 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether, di-fluoro ethylene carbonate, ethyl difluoroacetate and diglyme, and the combination of additives comprises at least tris(trimethylsilyl)phosphite (TMSPi) and succinonitrile (SN).

Abstract: A method and system for in operando, in situ, and real-time monitoring the state of an electrochemical device, e.g. battery, is provided, which is by means of an optical fiber probe inside the electrochemical device. The method includes: shedding an input light into the optical fiber probe and detecting an output light transmitted therefrom; and determining state of health of the electrochemical device based on the output light. The determination step can be based on a change of the refractive index or of the cladding mode or the surface plasmon resonance, all derived from the output light, in the instant state compared to a prior state. The method can simultaneously detect other parameters including state of charge, temperature, pressure, strain, displacement, vibration, or gas release inside the electrochemical device. With a core mode for correction, the determination of these parameters can also realize a high accuracy.

Abstract: An electrochemical cell, includes a positive electrode and a negative electrode arranged face to face in the cell body, and a stack of electrolyte layers interposed between the positive electrode and the negative electrode. The stack of electrolyte layers comprises a first layer of solid electrolyte arranged at one end of the positive electrode, a second layer of solid electrolyte arranged at one end of the negative electrode, a composite powder layer interposed between the first layer and the second layer, the composite powder layer comprising an electrolyte powder and an electroactive material powder serving as a reference electrode for the electrochemical cell.

Abstract: A device is provided that measures an overall generated heat flow rate released by a battery cell The device comprises an electrical power source for charging and discharging the battery, an internal temperature sensor placed inside the battery, a surface temperature sensor placed on the surface of the battery cell, and an ambient temperature sensor placed in the ambient environment. The device also includes a memory that records the temperatures, and a processor. The processor computes characteristic thermal attributes of the battery cell based on a predetermined thermal equivalent circuit of the battery, using temperatures recorded over a predetermined calibration time period, during which the battery is subjected to current emitted by the electrical power source. The processor then computes the heat flow rate generated by the battery cell towards its ambient environment from a set of recorded temperatures and the thermal attributes of the battery cell.

Abstract: The invention relates to a method for in-life testing of the formation of the solid electrolyte interface layer of a battery cell, comprising the following steps: sensing the temperature within the battery cell, recording a first set of temperature (T) and/or pressure data related to the temperature variation (?T) and/or pressure variation within the battery cell over a first charge of the battery cell, and determining a positive or negative datum relating to the formation of solid electrolyte interface layer of the battery cell according to said first set of temperature and/or pressure data

Abstract: A method for selecting between a first battery cell and a second battery cells includes sensing a total generated heat flow rate emitted by the first battery cell and the second battery cells. The method further includes recording, for the first and second battery cells, first and second sets of heat flow rate data related to the total generated heat flow rate emitted by the first and second battery cells, respectively, over their first charge. The method further includes comparing the first set of heat flow rate data with the second set of heat flow rate data, and selecting one of the first or second battery cells according to the comparison between the first set of heat flow rate data with the second set of heat flow rate data.

Abstract: The present invention generally relates to the use of a transition metal sulphide compound in a positive electrode for solid state batteries, to a transition metal sulphide compound, to a device or a material incorporating said compound, such as a composite material, an electrode, an electrochemical energy storage cell or a device such as an all-solid-state battery. It further relates to a method to manufacture and/or to use such a compound, material or device and to a process to manufacture said compound, material and/or device.

Abstract: Some embodiments include an electrolyte composition for a battery using sodium ions as electrochemical vector, to the use of such an electrolyte composition as non-aqueous liquid electrolyte in a sodium-ion battery and to a sodium-ion battery comprising such a non-aqueous liquid electrolyte. In some embodiments, the amount of (oxalato)borate ranges from 0.05 to 10 wt. %, relative to the total weight of the electrolyte composition.

Abstract: A compound of formula I: NaxNi0.5-yZnyMn0.5-zTizO2 (I), wherein x is a number ranging from 0.7 and 1.1, y is a number superior to 0 and up to 0.1, and z is a number between 0 and 0.5, batteries incorporating the compound and its use in particular as an positive electrode material for Na-ion batteries and cells and a process to obtain such a compound.

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 relates to a process for the preparation of sodium-based solid compounds, such as sodium-based solid alloys and sodium-based crystalline phases by ball-milling using metallic sodium as starting material. The invention also relates to some sodium-based crystalline P?2-phases and to Na-based vanadium phosphates phases (Na(3+y)V2(PO4)3) with 0<y?3 and Na-based vanadium fluorophosphates phases (Na(3+z)V2(PO4)2F3) with 0<z?3, in particular Na4V2(PO4)2F3, obtained by such a process and to their use, as active material for positive electrode, in a Na-ion battery.

Abstract: An electrolyte composition includes at least a sodium salt dissolved in at least one solvent and a combination of additives. The solvent is any of ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, propylene carbonate, ethyl acetate, ethyl propionate, methyl propionate, 4-fluorotoluene, 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether, di-fluoro ethylene carbonate, ethyl difluoroacetate, or mixtures of the foregoing. The combination of additives includes at least sodium difluoro(oxalato)borate (NaODFB) and tris(trimethylsilyl)phosphite (TMSPi).

Abstract: An adaptation device is provided for adapting an UV-Vis cuvette to perform in-situ spectroanalytical characterization of redox processes using gas species or solutes in a controlled atmosphere, the device configured to fit the open end of a UV-Vis cuvette intended to contain products to be measured during achievement of spectroanalytical measurements. The device comprises a main body configured to form a lid covering the opened end of the cuvette, the main body having a first part and a second part; a working, a counter and a reference electrode with removable parts at the respective ends of three conductors coming from outside and passing through the main body; a gas inlet to allow introduction of a gas the gas inlet having one aperture directed to the working electrode and second aperture directed to the bottom of the cuvette, a gas outlet intended to let the reactive gas in excess to flow out of the cuvette and an solution inlet tube for titration measurements.

Abstract: The present invention relates to the new process of preparation of a Li-rich layered oxide based on Mn and optionally on Ni and/or Co in which F is incorporated within the crystal of the oxide (or “fluorinated oxide”). It also relates to the new fluorinated oxide its use as a component in a cathode of a battery.

Abstract: The present invention relates to an electrolyte composition for a battery using sodium ions as electrochemical vector, to the use of such an electrolyte composition as non-aqueous liquid electrolyte in a sodium-ion battery and to a sodium-ion battery comprising such a non-aqueous liquid electrolyte.

Abstract: An adaptation device is provided for adapting an UV-Vis cuvette to perform in-situ spectroanalytical characterization of redox processes using gas species or solutes in a controlled atmosphere, the device configured to fit the open end of a UV-Vis cuvette intended to contain products to be measured during achievement of spectroanalytical measurements. The device comprises a main body configured to form a lid covering the opened end of the cuvette, the main body having a first part and a second part; a working, a counter and a reference electrode with removable parts at the respective ends of three conductors coming from outside and passing through the main body; a gas inlet to allow introduction of a gas the gas inlet having one aperture directed to the working electrode and second aperture directed to the bottom of the cuvette, a gas outlet intended to let the reactive gas in excess to flow out of the cuvette and an solution inlet tube for titration measurements.

Abstract: The present invention relates to a method for producing a positive electrode composite material comprising at least one Na-based positive electrode active material and Na3P for a battery using sodium ions as electrochemical vector, to a positive electrode comprising such a positive electrode composite material, and to the Na-ion battery comprising such a positive electrode.

Abstract: The invention relates to a method for the preparation of a solid carbonaceous material locally graphitized from a self-supporting hard carbon using laser isolation.

Abstract: The present invention relates to a method for producing a positive electrode material comprising at least one Na-based solid crystalline phase selected in the group consisting of Na-based crystalline P?2-phases, Na-based solid crystalline phases of formula Na(3+x)V2(PO4)3 with 0<x?3 and Na-based solid crystalline phases of formula Na(3+y)V2(PO4)2F3 with 0<y?3, for a battery using sodium ions as electrochemical vector, said method using a ball milling process involving Na3P as starting material.

Abstract: The invention relates to a process for the preparation of sodium-based solid compounds, such as sodium-based solid alloys and sodium-based crystalline phases by ball-milling using metallic sodium as starting material. The invention also relates to some sodium-based crystalline P?2-phases and to Na-based vanadium phosphates phases (Na(3+y)V2(PO4)3) with 0<y?3 and Na-based vanadium fluorophosphates phases (Na(3+z)V2(PO4)2F3) with 0<z?3, in particular Na4V2(PO4)2F3, obtained by such a process and to their use, as active material for positive electrode, in a Na-ion battery.