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: 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 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: 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: An “all-solid-state” Li-ion battery comprising a monolithic body formed by at least three superposed layers, including: at least one layer of a negative-electrode composite comprising at least one active negative-electrode material, at least one solid electrolyte, and at least one electron-conductivity providing agent. The at least one layer of a positive-electrode composite has at least one active lithium-based positive-electrode material, at least one solid electrolyte, and at least one electron-conductivity providing agent. The at least one intermediate solid-electrolyte layer separating the composite negative- and positive-electrode layers from one another. The solid-electrolyte content in each of the composite electrode layers independently varies from 10 to 80 wt %. The content of the electron-conductivity providing agent in each of the composite electrode layers independently varies from 2 to 25 wt %.

Abstract: The present invention relates to a method for preparing a completely solid Li-ion battery having a solid state body wherein the battery is assembled in a single step by stacking at least one layer of a powder mix including a positive electrode active material and a solid electrolyte, at least one intermediate layer of a solid electrolyte and at least one layer of a powder mix including a negative electrode active material and a solid electrolyte, and simultaneous sintering of the three layers at a pressure of at least 20 MPa, under pulsating current. The invention also relates to the Li-ion battery obtained by such a method.

Abstract: A method of synthesis of a metal fluorophosphate having the following general formula (1): XaMb(PO4)cFd (1), in which: X is an alkaline metal selected among sodium (Na) and lithium (Li) or a mixture of said metals; M is a transition metal selected among the following elements: Co, Ni, Fe, Mn, V, Cu, Ti, Al, Cr, Mo, Nb or a combination of at least two of said metals, 0?a?5; 0.5?b?3; 0.5?c?3; and d is an integer equal to 1, 2 or 3. The method contains an electric-field-activated sintering process for a mixture (1) formed by at least one first phosphate-containing solid precursor and at least one second fluorine-containing solid precursor.

Abstract: The present invention relates to a method for preparing a completely solid Li-ion battery having a solid state body wherein the battery is assembled in a single step by stacking at least one layer of a powder mix including a positive electrode active material and a solid electrolyte, at least one intermediate layer of a solid electrolyte and at least one layer of a powder mix including a negative electrode active material and a solid electrolyte, and simultaneous sintering of the three layers at a pressure of at least 20 MPa, under pulsating current. The invention also relates to the Li-ion battery obtained by such a method.

Abstract: A method of synthesis of a metal fluorophosphate having the following general formula (1): XaMb(PO4)cFd (1), in which: X is an alkaline metal selected among sodium (Na) and lithium (Li) or a mixture of said metals; M is a transition metal selected among the following elements: Co, Ni, Fe, Mn, V, Cu, Ti, Al, Cr, Mo, Nb or a combination of at least two of said metals, 0?a?5; 0.5?b?3; 0.5?c?3; and d is an integer equal to 1, 2 or 3. The method contains an electric-field-activated sintering process for a mixture (1) formed by at least one first phosphate-containing solid precursor and at least one second fluorine-containing solid precursor.