The invention relates to an NVPF-based composition and the use thereof in the field of batteries as an electrochemically active material. The invention also relates to a conductive composition comprising said composition as well as to a method for obtaining said composition.

The present invention relates to a method of preparing a lithium difluorophosphate crystal. More particularly, the present invention relates to a method of preparing a high-purity lithium difluorophosphate crystal at a high yield, and the high-purity lithium difluorophosphate crystal prepared by the method can be used for various purposes.

The present invention relates to a method of preparing a lithium difluorophosphate crystal. More particularly, the present invention relates to a method of preparing a high-purity lithium difluorophosphate crystal at a high yield, and the high-purity lithium difluorophosphate crystal prepared by the method can be used for various purposes.

The present invention relates to a method of preparing a lithium difluorophosphate crystal. More particularly, the present invention relates to a method of preparing a high-purity lithium difluorophosphate crystal at a high yield, and the high-purity lithium difluorophosphate crystal prepared by the method can be used for various purposes.

The present disclosure relates to a sodium-ion storage material including a doped compound, and an electrode material for a sodium-ion battery, an electrode for a sodium-ion battery, and a sodium-ion battery, which include the sodium-ion storage material. Specifically, the sodium-ion storage material may include a compound consisting of an Na.sub.3V.sub.2-xM.sub.x(PO.sub.4).sub.2F.sub.3/Na.sub.3V.sub.2-yM.sub.y(PO.sub.4).sub.3 composite (M=Fe, Mn, Cr, Cu, Zn or Ti, 0<x,y≤2). When the sodium-ion storage material according to the present disclosure is used, it may maintain high discharge capacity while reducing the vanadium content, and when the sodium-ion storage material is applied to a sodium-ion secondary battery or a sodium-magnesium hybrid-ion battery, the battery may exhibit excellent charge/discharge cycle characteristics.

The present disclosure relates to a sodium-ion storage material including a doped compound, and an electrode material for a sodium-ion battery, an electrode for a sodium-ion battery, and a sodium-ion battery, which include the sodium-ion storage material. Specifically, the sodium-ion storage material may include a compound consisting of an Na.sub.3V.sub.2-xM.sub.x(PO.sub.4).sub.2F.sub.3/Na.sub.3V.sub.2-yM.sub.y(PO.sub.4).sub.3 composite (M=Fe, Mn, Cr, Cu, Zn or Ti, 0<x,y≤2). When the sodium-ion storage material according to the present disclosure is used, it may maintain high discharge capacity while reducing the vanadium content, and when the sodium-ion storage material is applied to a sodium-ion secondary battery or a sodium-magnesium hybrid-ion battery, the battery may exhibit excellent charge/discharge cycle characteristics.

The present disclosure provides a solid electrolyte material having high lithium ion conductivity. The solid electrolyte material according to the present disclosure has a crystal structure including a structure framework and an ion-conductive species, wherein the structure framework has a one-dimensional chain in which a plurality of polyhedrons are linearly connected to each other while sharing a corner, and each of the plurality of polyhedrons contains at least one type of cation and at least one type of anion.

A method for preparing a Na.sub.3V.sub.2(PO.sub.4).sub.2F.sub.3 material, including at least the steps: a) reducing the vanadium oxide, V.sub.2O.sub.5, under a reducing atmosphere in the absence of elementary carbon and in the presence of at least one phosphate anion precursor in order to form vanadium phosphate, VPO.sub.4; and b) exposing, under an inert atmosphere, a mixture of the VPO.sub.4 material obtained in step a) with an effective amount of sodium fluoride, NaF, and at least one hydrocarbon- and oxygen-containing compound which is a source of elementary carbon, to temperature conditions that are favourable for calcining said mixture so as to form said Na.sub.3V.sub.2(PO.sub.4).sub.2F.sub.3 compound. Also, a related electrode material, an electrode and a secondary sodium battery using the presented material.

A method for preparing a Na.sub.3V.sub.2(PO.sub.4).sub.2F.sub.3 material, including at least the steps: a) reducing the vanadium oxide, V.sub.2O.sub.5, under a reducing atmosphere in the absence of elementary carbon and in the presence of at least one phosphate anion precursor in order to form vanadium phosphate, VPO.sub.4; and b) exposing, under an inert atmosphere, a mixture of the VPO.sub.4 material obtained in step a) with an effective amount of sodium fluoride, NaF, and at least one hydrocarbon- and oxygen-containing compound which is a source of elementary carbon, to temperature conditions that are favourable for calcining said mixture so as to form said Na.sub.3V.sub.2(PO.sub.4).sub.2F.sub.3 compound. Also, a related electrode material, an electrode and a secondary sodium battery using the presented material.

The present invention relates to a process for preparing an ammonium vanadium phosphate of formula (NH.sub.4)(VO.sub.2)(HPO.sub.4). It also relates to a process for preparing a vanadium orthophosphate VPO.sub.4.