19 results about "Magnesium battery" patented technology

The present application relates to thin film magnesium battery zirconium magnesium phosphate solid electrolyte target material, preparation method and thin film magnesium battery, belong to magnesium battery technical field. Including: magnesium salt powder is mixed with diaphosphorus pentoxide and zirconium oxide powder to obtain mixed powder; the mixed powder is put into a closed ball mill tank and mixed with zirconium oxide balls, then a dispersing agent is added and mixed and ball milled; then a binder is added to the ball mill tank and ball milled; the synthesized powder after ball milling is sieved through a 500 mesh sieve, the sieved synthesized powder is poured into a vibrating mold, pressed, and a die pressed blank is formed; the blank is put into a cold isostatic pressing machine and pressed and pressure maintained, to obtain a zirconium magnesium phosphate solid electrolyte target material blank after cold isostatic pressing; the zirconium magnesium phosphate solid electrolyte target material blank is put into an atmosphere sintering furnace or a vacuum sintering furnace, after multi-stage heat preservation, the furnace is naturally cooled to room temperature, to obtain a thin film magnesium battery zirconium magnesium phosphate solid electrolyte target material. The composition of the solid electrolyte target material of the present application is uniform, facilitating thin film deposition.

The application relates to the technical field of electrochemical energy storage, and discloses a 1T-MoSe2 / 2H-MoS2 heterostructure material and a preparation method and application thereof. The application discloses a preparation method of the 1T-MoSe2 / 2H-MoS2 heterostructure material, which comprises the following steps: 1, synthesizing 1T phase-rich MoSe2 nanosheets; and 2, synthesizing the 1T-MoSe2 / 2H-MoS2 heterostructure material by taking the 1T phase-rich MoSe2 nanosheets synthesized in the step 1 as raw materials. The 1T-MoSe2 / 2H-MoS2 heterostructure material provided by the application can provide high reversible magnesium storage capacity, excellent rate performance and excellent cycle stability, and provides a promising way for high-performance rechargeable magnesium battery positive electrode materials.

To provide a negative electrode material for a magnesium battery that exhibits low initial overvoltage and uniform dissolution and deposition of magnesium ions at the negative electrode. [Solution] An Mg negative electrode material having elongated grooves on its surface with a spacing of 0.1 μm or more and 5000 μm or less, a width of 0.1 μm or more and 25 μm or less, and a depth of 0.05 μm or more and 25 μm or less, with an area ratio of 0.1% or more, resulting in a low initial overvoltage during constant current voltage testing and melting behavior occurring along the laser-processed marks. For example, laser processing is used to form the elongated grooves.

This invention relates to the field of electrochemical technology and discloses a low-temperature fluorine-containing rechargeable magnesium battery electrolyte, comprising a magnesium salt, a main solvent, and a composite additive. The composite additive is a mixed solution of an amine solvent and a fluorinated ether solvent. The concentration of the magnesium salt is 0.1-1.0 mol / L, and the volume ratio of the main solvent to the composite additive is (2-3.3):1. The preparation method includes the following steps: S1: Weigh a certain amount of magnesium salt and dissolve it in the main solvent, stirring for 6-8 hours to form solution A; S2: Slowly add the fluorinated ether solvent to solution A in S1, stirring for 6-8 hours to form solution B; S3: Add the amine solvent to solution B in S2, stirring for 6-8 hours to obtain the low-temperature fluorine-containing rechargeable magnesium battery electrolyte. Its application: The application of a low-temperature fluorine-containing rechargeable magnesium battery electrolyte in rechargeable magnesium batteries. The technical solution of this invention can improve the reversible magnesium deposition and dissolution performance of the electrolyte, and also improve the performance of Mg at low temperatures. 2+ The transport dynamics and ionic conductivity.

This invention discloses a doped magnesium vanadate cathode material, its preparation method, and its application, belonging to the field of magnesium battery technology. The preparation of the doped magnesium vanadate cathode material includes: reacting a mixed solution of vanadium source solution, molybdenum source solution, and magnesium source solution to obtain a cathode material precursor; and calcining the cathode material precursor. This method can precisely target the doping of Mo element in magnesium vanadate. Single doping of Mo introduces strong Mo-O bonds, effectively stabilizing the structure and suppressing the spinel-to-rock salt phase transition. Furthermore, O2p-Mo4d orbital hybridization improves electronic conductivity and rate performance, effectively overcoming the difficulty of simultaneously achieving structural stability and ion-electron dynamics in spinel cathode materials for magnesium batteries. The obtained doped magnesium vanadate cathode material is a spinel system, and the magnesium metal battery further prepared from it is the first discovered spinel-based magnesium metal battery capable of cycling at room temperature.

A method of forming an electrolyte includes combining a magnesium closo-borate-organic solvent salt with an organic cation-anion salt, and removing the organic solvent from the magnesium closo-borate-organic solvent salt and to form an electrolyte comprising a magnesium closo-borate salt / organic cation-anion salt mixture. The magnesium closo-borate salt can have the structure Mg(CyBa−yHa−zXz)(2−(1−y)) where: y is 0 or 1; a is 10 or 12; z is 0 to a; and X is independently halogen, alkyl, alkoxy, acyl, aryl, alkylaryl, arylalkyl, and / or aryloxy substituents and wherein alkyl groups can be linear, branched, or cyclic. Also, any of the substituents can be partially or fully halogenated.

The application relates to the technical field of magnesium secondary battery cells, and particularly discloses a magnesium battery tab; the tab comprises at least two main body parts, a buffer part is arranged between the two adjacent main body parts, the thickness of the buffer part is smaller than that of the main body part, and the difference between the thicknesses of the buffer part and the main body part is D n , D / 10<=D n <=D / 4. The application solves the problem of high welding difficulty of multilayer tab in a magnesium secondary battery.

The application relates to the technical field of magnesium secondary batteries, in particular to a magnesium battery cell structure; the magnesium battery cell structure comprises a pole piece unit and a tab, the pole piece unit comprises two pole piece assemblies, the two pole piece assemblies are located on the two sides of the tab, the two pole piece assemblies each comprise at least two pole piece groups, each pole piece group is formed by a plurality of pole pieces being attached to each other, the pole piece group comprises an overlapping part and a welding part; the tab comprises a plurality of main body parts which are sequentially distributed along the length direction, a buffer part is arranged between adjacent main body parts, the thickness of the buffer part is smaller than the thickness of the main body part, and a slope is arranged between the buffer part and the main body part; the welding part corresponds to the main body part one by one and is fixed with the main body part, and the welding parts of the plurality of pole piece groups of the same pole piece assembly are sequentially distributed along the length direction of the pole piece. The magnesium battery cell structure solves the problems of large space occupation, high cost and low welding quality of the cell in the current magnesium secondary battery.

This invention relates to a magnesium battery electrolyte, its preparation method, and a magnesium battery. The magnesium battery electrolyte comprises a magnesium salt electrolyte, organoboronic acid and its derivatives, an organic ether solvent, and additives. The magnesium battery electrolyte does not contain chlorine-containing compounds. The magnesium salt electrolyte is a non-nucleophilic electrolyte, and the additives are dehydrating additives. This invention also provides a method for preparing the magnesium battery electrolyte, wherein water is removed from the magnesium salt electrolyte, organoboronic acid and its derivatives, organic ether solvent, and additives respectively; under anhydrous and oxygen-free conditions, the magnesium salt electrolyte and organic ether solvent are mixed, and then organoboronic acid and its derivatives and additives are added sequentially under stirring, and the mixture is stirred for 8 to 30 hours to obtain the magnesium battery electrolyte. This invention also provides a magnesium battery in which the electrolyte is the magnesium battery electrolyte described in this invention. This invention solves the problems of narrow electrochemical window and short cycle life in magnesium batteries.

The application relates to an annealing method of a thin-film magnesium battery magnesium cobaltate positive electrode target material, a positive electrode target material and a battery, and belongs to the technical field of magnesium batteries. After three-stage heat preservation, the annealing method is adopted to cool the furnace to 175-185 DEG C for continuous heat preservation, then the furnace is naturally cooled to room temperature, and the annealed thin-film magnesium battery magnesium cobaltate positive electrode target material is obtained; the first-stage heat preservation temperature is less than the second-stage heat preservation temperature, the second-stage heat preservation temperature is less than the third-stage heat preservation temperature, and the third-stage heat preservation temperature is 445-455 DEG C. The thin-film magnesium battery magnesium cobaltate positive electrode target material treated by the annealing method is uniform in composition, free from segregation, good in grain size consistency, free from cracks, free from stratification, free from bulges, convenient to machine in subsequent machining, and convenient to thin-film deposition in preparation of a full-solid-state thin-film magnesium battery.

The present application relates to thin film magnesium battery magnesium aluminate manganese positive target material, preparation method and thin film magnesium battery, belong to magnesium battery technical field. Including: magnesium salt powder is mixed with manganese trioxide and aluminum oxide powder to obtain mixed powder; the mixed powder is put into a ball mill tank and mixed with zirconium oxide balls, then a dispersing agent is added and the mixing and ball milling are continued; then a binder is added to the ball mill tank and the ball milling is continued; the synthesized powder after ball milling is sieved through a 500 mesh sieve, the sieved synthesized powder is weighed, poured into a vibrating mold, pressed, and a molded blank is formed; the blank is put into a cold isostatic pressing machine, pressed and pressure maintained, and a magnesium aluminate manganese positive target material blank after cold isostatic pressing is obtained; the magnesium aluminate manganese positive target material blank is put into an atmosphere sintering furnace or a vacuum sintering furnace, and after multi-stage heat preservation and multi-stage cooling, the furnace is naturally cooled to room temperature, and a thin film magnesium battery magnesium aluminate manganese positive target material is obtained. The composition of the thin film magnesium battery magnesium aluminate manganese positive target material of the present application is uniform, and thin film deposition is facilitated.

This invention provides a novel sulfonylimide-based chelated magnesium salt, its preparation method, an electrolyte containing the salt, and a rechargeable magnesium battery. The sulfonylimide-based chelated magnesium salt is (1,2-diphenylethane-1,2-diyl)bis((trifluoromethyl)sulfonyl)amide magnesium. The sulfonylimide anion designed in this invention can effectively chelate magnesium ions and regulate their solvation structure. This anion preferentially decomposes on the magnesium anode surface, participating in the formation of a dense and stable SEI film, significantly improving the interfacial compatibility between the electrolyte and the magnesium anode, thereby enhancing the coulombic efficiency and cycle stability of magnesium deposition / dissolution.

The application relates to an annealing method of a thin-film magnesium battery zirconium magnesium phosphate solid electrolyte target material, a solid electrolyte target material and a battery, and belongs to the technical field of magnesium batteries. After four-stage heat preservation, the annealing method is adopted to cool the furnace to 110-125 DEG C for continuous heat preservation, then the furnace is naturally cooled to room temperature, and the annealed thin-film magnesium battery zirconium magnesium phosphate solid electrolyte target material is obtained; the first-stage heat preservation temperature is less than the second-stage heat preservation temperature, the second-stage heat preservation temperature is less than the third-stage heat preservation temperature, the third-stage heat preservation temperature is less than the fourth-stage heat preservation temperature, and the fourth-stage heat preservation temperature is 660-680 DEG C. The thin-film magnesium battery zirconium magnesium phosphate solid electrolyte target material treated by the annealing method is uniform in composition, free of segregation, good in grain size consistency, free of cracks, free of stratification, free of bulges, convenient to machine in subsequent machining, and convenient to thin-film deposition in the preparation of the all-solid-state thin-film magnesium battery.

The present application discloses a solvent composition, an electrolyte, and a rechargeable magnesium battery. The composition comprises a fluorinated ether and a non-aqueous solvent in a volume ratio of 1:0.15 to 4, and the non-aqueous solvent comprises an ionic liquid and / or an organic solvent selected from imidazole compounds substituted with C1-C4 alkyl groups, sulfoxide or sulfone compounds with C2-C6, cyclic carbonate compounds with C3-C5, carboxylic ester compounds with C2-C6, pyridine or alkylbenzene aromatic compounds substituted with methyl, chlorine, amino groups or unsubstituted, C1-C4 amide compounds, acetonitrile compounds substituted with chlorine, pyridine or unsubstituted, and an ether compound selected from cyclic monoethers or diethers with C3-C4 or an ether compound satisfying the general formula H3CO(C2H4O) n CH3, where n ranges from 1 to 8, or a combination thereof. The composition utilizes the property that fluorinated ether molecules are relatively easy to obtain electrons to form a stable electrode-electrolyte interface, regulates the solvation structure of the chlorine-containing electrolyte, improves the ionic conductivity, and realizes the reversible electrochemical cycle of the magnesium metal negative electrode at a high current density.

The present application relates to a kind of thin film magnesium battery magnesium cobaltate positive target material, preparation method and thin film magnesium battery, belong to magnesium battery technical field.Preparation method includes: magnesium salt powder is mixed with tricobalt tetroxide powder to obtain mixed powder;Mixed powder is placed in ball mill jar and mixed with zirconium oxide ball, then dispersing agent is added and continue to mix and ball mill;Then add binder in ball mill jar, continue to ball mill;Synthetic powder after ball milling is passed through 500 mesh screen, after weighing, pour into vibration mold, pressurize, form die pressed blank;Blank is placed in cold isostatic press and pressurized and pressure holding, obtain magnesium cobaltate positive target material blank after cold isostatic pressing;Magnesium cobaltate positive target material blank is placed in atmosphere sintering furnace or placed in vacuum sintering furnace, after multi-section heat preservation, multi-section cooling, with furnace natural cooling to room temperature, obtain thin film magnesium battery magnesium cobaltate positive target material.The composition of the thin film magnesium battery magnesium cobaltate positive target material prepared by the present application is uniform, which is convenient for thin film deposition.

The application relates to the technical field of battery preparation, and discloses a magnesium-sodium hybrid ion battery positive electrode material and a preparation method and application thereof, which comprises a magnesium rechargeable battery positive electrode material, and raw material components of the magnesium-sodium hybrid ion battery positive electrode material are as follows: a manganese source comprises MnO2, Mn2O3 and MnCO3; a sodium source is Na2CO3 and CH3COONa; and a transition metal source is Fe, Co, Ni and Ti. A manganese-based tunnel structure positive electrode material main structure is composed of a double / triple linear chain structure of MnO6 octahedron shared edges and a single chain structure of MnO5 tetrahedron shared edges, a large space tunnel structure formed can supply ions for fast deintercalation; the tunnel type diffusion channel is in an ion half-filled state, has sufficient ion vacancies, meets the requirement of ion electrochemical deintercalation along a c-axis direction, and has more excellent crystal structure stability in the process of electrochemical deintercalation of sodium compared with a manganese-based layered structure, effectively improves ion transmission kinetics of the positive electrode material, improves stability of the material, and improves rate performance and cycle life of a battery.

The application discloses a fluorinated alkyl electrolyte for rechargeable magnesium batteries and a preparation method and application thereof, and the preparation method comprises the following steps: adding anhydrous aluminum chloride into an ether solvent under room temperature and an inert atmosphere, adding a fluorinated alkyl magnesium salt after uniform mixing, stirring until a colorless transparent clear liquid is obtained, and then adding anhydrous magnesium chloride, so that the fluorinated alkyl electrolyte for rechargeable magnesium batteries is obtained after reaction. The electrolyte can be synthesized by one-step stirring in the ether solvent, and no additional additives and water removing agents are needed, so that the electrolyte is easy to be produced on a large scale; the prepared fluorinated alkyl electrolyte has small polarization, high oxidation stability and high coulombic efficiency of magnesium deposition-dissolution.

This invention discloses a method for in-situ growth of an SEI film on the surface of a magnesium anode in a rechargeable magnesium battery, comprising the following steps: 1) dissolving and mixing tin salt and antimony salt, then adding an electrolytic solvent and stirring until homogeneous to obtain an electrolyte; 2) using magnesium metal as the anode, assembling a rechargeable magnesium battery with the electrolyte prepared in step 1), wherein during storage and charging / discharging, the electrolyte generates an in-situ SnSb-based SEI film on the magnesium metal surface. This invention utilizes an electrolyte containing tin and antimony, which undergoes a reduction-oxidation reaction with magnesium metal to grow an artificial SnSb-based SEI film on the magnesium anode surface. Simultaneously, Sb and Sn exhibit good magnesium affinity, enhancing the Mg²⁺-coated interface between the electrolyte and the electrode. 2+ The SEI film can alleviate the direct contact between magnesium metal and electrolyte, reduce the nucleation potential and dissolution barrier of magnesium deposition, inhibit the growth of magnesium dendrites, and improve the overall performance of the battery.

The invention provides a magnesium anode and an electrochemical cell comprising the anode.