71 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 present application relates to thin film magnesium battery magnesium-aluminum-cobalt cathode target material, preparation method and thin film magnesium battery, belong to magnesium battery technical field. Including: magnesium salt powder is mixed with three cobalt tetraoxide 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 and then poured into a vibrating mold, is pressed to form a molded blank; the blank is put into a cold isostatic pressing machine and is pressed and pressure maintained to obtain a cold isostatic pressed magnesium-aluminum-cobalt cathode target material blank; the magnesium-aluminum-cobalt cathode target material blank is put into an atmosphere sintering furnace or a vacuum sintering furnace, after multi-stage heat preservation and multi-stage cooling, the furnace is naturally cooled to room temperature, and a thin film magnesium battery magnesium-aluminum-cobalt cathode target material is obtained. The composition of the thin film magnesium battery magnesium-aluminum-cobalt cathode target material of the present application is uniform, and the thin film deposition is facilitated.

This invention discloses a type of sodium titanate with a layered crystal structure, its preparation method, and its application in aqueous magnesium-ion batteries, belonging to the field of aqueous magnesium-ion battery technology. This invention uses sodium titanate with a layered crystal structure as the negative electrode material in aqueous magnesium-ion batteries. Due to its excellent chemical and structural stability, sodium titanate can achieve reversible magnesium deposition in aqueous magnesium electrolytes. 2+ Intercalation / extraction. This invention synthesizes Na via a hydrothermal method and a high-temperature annealing process. 2 Ti 2 O 5 And Na 2 Ti 3 O 7 Materials. In magnesium chloride electrolyte, both sodium titanate materials exhibit extremely low charge / discharge potentials (Na). 2 Ti 2 O 5 -1.3 to -0.6V vs. SCE; Na 2 Ti 3 O 7 (-1.5 to -1V vs. SCE) and good cycle stability. Furthermore, Na... 2 Ti 2 O 5 The half-cell exhibits a charge-discharge specific capacity of up to 213 mAh / g at a current density of 2 A / g, and maintains a high specific capacity of 150 mAh / g even at a high current density of 10 A / g. The sodium titanate of this invention is an ideal anode material for aqueous magnesium batteries, possessing both low cost and environmental friendliness, and shows great promise for application in the field of aqueous magnesium-ion energy storage.

The invention discloses a preparation method of a boron-based magnesium salt and alcohol / phenol magnesium additive composite magnesium salt electrolyte, and relates to the technical field of magnesium ion batteries, and the preparation method comprises the following steps: S1, in an inert atmosphere or an air environment, dissolving / dispersing a magnesium source in an organic solvent, and stirring to obtain a solution a; s2, adding alcohol or phenol into the solution a, and reacting to obtain a solution b; s3, performing post-treatment on the solution b to obtain alcohol magnesium salt or phenol magnesium salt crystals; and S4, co-dissolving alcohol magnesium salt or phenol magnesium salt and fluorine-containing alkoxy magnesium borate in an ether solvent according to a molar ratio of 1: (3-100) to form the composite magnesium salt electrolyte. According to the magnesium battery using the electrolyte, the cycle life can be prolonged by 20%-100%, the actual service cycle of the battery is prolonged, the coulombic efficiency is improved to 97%-99.5%, irreversible capacity loss in the charging and discharging process is reduced, the energy utilization efficiency is improved, the oxidation potential is improved by 0.2-0.5 V compared with that of a traditional electrolyte, the stability and oxidation resistance of the electrolyte are enhanced, and the service life of the magnesium battery is prolonged. And the working voltage window of the battery is widened.

The invention provides a modified electrolyte of a rechargeable magnesium battery as well as a preparation method and application of the modified electrolyte. The modified electrolyte comprises a phenoxy magnesium-aluminum halide complex, an organic ether solvent and a lithium salt additive, the lithium salt additive is selected from at least one of lithium fluorosulfonate, lithium trifluoromethanesulfonate, lithium bis (fluorosulfonyl) imide and lithium bis (trifluoromethanesulfonyl) imide. The lithium salt additive does not contain chloride ions, corrosion to a current collector is inhibited, and a solvation structure of magnesium ions in the electrolyte is effectively regulated and controlled, so that the lithium salt additive has a wide electrochemical window, high ionic conductivity, low overpotential and high reversibility. The invention further provides a preparation method of the magnesium battery electrolyte, the preparation process is simple, convenient and efficient, raw materials are low in price, and industrial large-scale production is facilitated.

The invention discloses a fluorinated ether electrolyte capable of being used for a magnesium metal negative electrode. The fluorinated ether electrolyte comprises magnesium salt, an organic solvent and a fluorinated ether additive, the organic solvent is an ether compound, and the volume ratio of the ether compound in the electrolyte is 80%-97%; the preparation method of the electrolyte comprises the following steps: dissolving a magnesium salt in an ether compound under the protection of inert gas, and then adding a fluorinated ether additive to obtain the electrolyte, the fluorinated ether electrolyte is applied to the magnesium ion battery. According to the electrolyte, the ether compound is adopted as the organic solvent to effectively dissolve magnesium salt and weaken the reaction of the organic solvent and magnesium ions, so that an electrode / electrolyte interface is stabilized, a solid electrolyte interface film is formed at the interface by adopting the fluorinated ether additive, and the interaction between the magnesium ions and the ether organic solvent is weakened, so that the electrolyte is more stable. The cycling stability of the magnesium battery using the material is improved; the electrolyte is simple in preparation method and high in operability.

The embodiment of the invention discloses a polymer electrolyte for a magnesium battery and the magnesium battery. The polymer electrolyte consists of a eutectic solvent, a cross-linking agent and a photoinitiator, the eutectic solvent is any one of a Mg (TFSI) 2 / N-methylformamide system or a MgCl2 / 2-chlorine-N, N-dimethylacetamide system, and N-methylformamide or 2-chlorine-N, N-dimethylacetamide is a hydrogen bond donor in the eutectic solvent; the crosslinking agent is polyethylene glycol diacrylate, and the photoinitiator is 2, 2-dimethoxy-2-phenyl acetophenone. According to the polymer electrolyte provided by the invention, high ionic conductivity, excellent electrochemical stability and good magnesium ion reversible deposition and dissolution performance are realized, the cycling stability is enhanced, the structural stability is also considered, and the polymer electrolyte has excellent reversibility and application potential in a magnesium battery; and the cycling stability and the energy efficiency of the magnesium battery can be obviously improved.

The present application relates to the technical field of new energy magnesium ion battery, and particularly relates to a nitrogen-containing boron-based double salt electrolyte, a preparation process and application thereof, components of the nitrogen-containing boron-based double salt electrolyte include a boron-based magnesium salt without chlorine element, Mg(hftab)2 and a small molecule ether, wherein a molar ratio of the boron-based magnesium salt without chlorine element to Mg(hftab)2 is (4-20):1, and the preparation process includes: uniformly mixing the boron-based magnesium salt without chlorine element and Mg(hftab)2 in a molar ratio of (4-20):1, adding the small molecule ether and stirring until completely dissolved. By implementing the present application, magnesium ion deposition is stabilized and an electrode interface film is improved, thereby breaking through the technical bottleneck of a traditional electrolyte magnesium ion concentration and remarkably improving the cycle life of a magnesium battery.

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.

The invention belongs to the technical field of rechargeable magnesium batteries, and discloses a high-wettability composite magnesium battery diaphragm as well as a preparation method and application thereof. The method comprises the following steps: (1) preparing a polymer spinning solution and preparing a base membrane through an electrostatic spinning process; (2) preparing a precursor spinning solution of a metal salt and a polymer, and carrying out electrostatic spinning and high-temperature calcination to obtain metal oxide nanofibers; and (3) mixing the metal oxide nanofibers with a binder to prepare coating slurry, and coating any side or two sides of the base membrane with the coating slurry. The polymer base film and the metal oxide nano coating form a stable integrated structure through physical and mechanical interlocking and chemical bonding, so that extremely high adhesion fastness of the coating in the circulating process is ensured, and falling is effectively prevented. Meanwhile, a three-dimensional network ion channel jointly constructed by the base membrane polymer fibers and the nanofibers can accelerate infiltration of an electrolyte. When the diaphragm is applied to the magnesium ion battery, the rate capability and the cycling stability of the battery can be remarkably improved.

The invention relates to the field of electrochemical energy storage materials, in particular to magnesium battery electrolyte and a preparation method thereof.The magnesium battery electrolyte comprises electrolyte salt, a capacity expansion and voltage stabilization agent, a halogen additive and a solvent; the concentration of the electrolyte salt is 0.01-2M; the capacity-expanding and pressure-stabilizing agent comprises fluorocarbon alkane, chloroalkane or bromoalkane, and the concentration of the capacity-expanding and pressure-stabilizing agent is 0.01-60 vol%; and the concentration of the halogen additive is 0.01-3 M. The magnesium deposition / dissolution overpotential can be remarkably reduced and the cycling stability and the energy density of the battery can be improved by adding the capacity expansion and voltage stabilization agent, regulating and controlling the magnesium ion solvation structure and inhibiting the negative electrode passivation reaction. The capacity-expanding and voltage-stabilizing agent is especially suitable for magnesium-sulfur batteries, and can generate strong adsorption with soluble polysulfide through Van der Waals force, so that dissolution of the capacity-expanding and voltage-stabilizing agent in electrolyte and diffusion of the capacity-expanding and voltage-stabilizing agent to a negative electrode are reduced, and therefore, loss of active substances is reduced, and further passivation of the polysulfide to the negative electrode is relieved.

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.

An electrolytic solution for a magnesium battery includes a solvent, an electrolyte salt, and an additive. The electrolyte salt includes a magnesium salt represented by Formula (1). The additive includes at least one of a first magnesium compound represented by Formula (2), a second magnesium compound represented by Formula (3), or a polycyclic aromatic hydrocarbon.         Mg[B(OC(R1)3)4]2 ......     (1) where: each of 24 R1's is any one of hydrogen (H), fluorine (F), an alkyl group, or a fluorinated alkyl group; and at least one of 24 R1's is either fluorine or the fluorinated alkyl group.         Mg[(N(Si(R2)3)2]2 ......     (2) where each of 12 R2's is either hydrogen or an alkyl group.         Mg(R3)2 ......     (3) where each of two R3's is either hydrogen or boron hydride (BH4).

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.

The invention provides a diaphragm for a magnesium battery. The diaphragm comprises a diaphragm substrate; the functional layer is formed on the surface of the diaphragm substrate, the functional layer comprises 0-20wt% of a conductive agent, 0-10wt% of a binder and the balance of an active material, and the active material comprises red phosphorus and a carbon material; the carbon material comprises one or more of a carboxyl carbon nano tube, a multi-wall carbon nano tube, a single-wall carbon nano tube and a porous carbon material. The invention also provides a preparation method of the material and a magnesium battery comprising the material. Red phosphorus and a carbon material are adopted to modify the diaphragm, the red phosphorus and carboxyl carbon nanotubes have a co-adsorption effect on polysulfide, the active adsorption sites of the polysulfide can be greatly improved, the shuttle effect of the polysulfide is effectively inhibited, and when the diaphragm is used for the magnesium battery, the service life of the diaphragm is prolonged. The specific discharge capacity, the cycling stability and the rate capability of the magnesium battery can be obviously improved.

The application provides a kind of fat diamine chemically modified polyetherimide diaphragm and its preparation method and application in lithium / magnesium battery.Polyetherimide and pore-forming agent are dissolved in organic solvent to form casting solution, the casting solution is solidified into film by phase inversion method, and then dried to obtain polyetherimide film; the polyetherimide film is immersed in fat diamine solution, and then dried to obtain fat diamine chemically modified polyetherimide diaphragm.The obtained fat diamine chemically modified polyetherimide diaphragm is rich in polar groups, has moderate and uniform pore size, high porosity, small contact angle, strong ion transmission capacity, effectively improves the thermal stability of diaphragm and the interface performance of battery, can be assembled with various electrode materials, and the assembled lithium ion battery and magnesium ion battery have better cycle stability than commercial polyolefin diaphragm.

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.

The application discloses application of a gel electrolyte in a rechargeable magnesium battery, wherein a magnesium salt in the electrolyte is a commercially available dibenzylamine magnesium chloride lithium chloride compound, a solvent is tetrahydrofuran, a concentration is 0.5 mol / L, a ring-opening polymerized monomer is 1,3-dioxolane, and an initiator is scandium triflate. The prepared gel polymer electrolyte has excellent magnesium anode compatibility, exhibits extremely low overpotential and highly reversible magnesium deposition-dissolution behavior, maintains a coulombic efficiency of about 98% after 600 cycles, and the overpotential of a symmetrical battery almost remains unchanged after 1000 cycles, being lower than 100 mV. An anodic decomposition potential on stainless steel is 2.5 V vs. Mg / Mg 2+ The rechargeable magnesium battery gel polymer electrolyte prepared according to the application method has the advantages of simple preparation process, cheap raw materials, high magnesium deposition-dissolution efficiency, low overpotential, high safety and flexibility, and the like, and provides a feasible way for the research of solid-state rechargeable magnesium batteries.

The application relates to the field of electrochemical electrode materials, and discloses a SnO2-loaded Bi-Sn alloy negative electrode material, which comprises Bi, Sn and SnO2, wherein the molar ratio of Bi to (Sn+SnO2) is 1:1; a preparation method of the SnO2-loaded Bi-Sn alloy negative electrode material, which comprises the following steps: S1, preparing a Bi2Sn2O7 precursor; S2, heating the Bi2Sn2O7 precursor prepared in S1 to 550-850 DEG C under a mixed atmosphere of inert gas and reducing gas, and keeping the temperature for 1-3 hours to obtain the SnO2-loaded Bi-Sn alloy negative electrode material; application of the SnO2-loaded Bi-Sn alloy negative electrode material, and the SnO2-loaded Bi-Sn alloy negative electrode material prepared in S2 is used for preparing a negative electrode active material of a secondary battery. The technical scheme can improve the diffusion speed of magnesium ions, prevent the formation of a passivation layer at an electrode / electrolyte interface, and realize reversible circulation of a magnesium battery.

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.

The application discloses a vanadium pentoxide-based magnesium battery positive electrode material and a preparation method thereof. The application obtains flower-spherical vanadium pentoxide through a hydrothermal reaction of an ammonium metavanadate and a mixed solution of reactants and subsequent calcination; the method has high production efficiency, is convenient to produce, has short preparation time, is low in cost and has good repeatability. The flower-spherical vanadium pentoxide nanomaterial is used as a magnesium battery positive electrode material, more surface active sites can be exposed, ion transmission channels are increased, the problem of stacking and agglomeration of vanadium pentoxide nanosheets in a cycle process is solved, the exposed (001) crystal face reduces the interface side reaction of an electrode and an electrolyte surface, the storage capacity of vanadium pentoxide is greatly improved, the vanadium pentoxide has good cycle stability and is an excellent magnesium battery positive electrode material.

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 invention relates to the technical field of rechargeable magnesium batteries, and particularly provides a high-safety rechargeable magnesium battery diaphragm for inhibiting magnesium dendrites as well as a preparation method and application of the high-safety rechargeable magnesium battery diaphragm. A high-safety rechargeable magnesium battery diaphragm capable of inhibiting magnesium dendrites is prepared from a first component and a second component through electrostatic spinning, the first component is one or more of nylon-based derivatives, and the second component is one or more of nylon-based derivatives. And the second component is one or more of polysaccharide or polyester derivatives containing polar group carboxyl, sulfonic group, hydroxyl, ether oxygen group or ester group. Through an electrostatic spinning technology, the nanofiber composite battery diaphragm with a spider network structure is obtained, and the nanofiber composite battery diaphragm has excellent electrolyte wettability, tensile strength and thermal stability. According to the invention, cellulose or polyester derivatives rich in polar functional groups are introduced on the basis of nylon derivatives with good chemical stability, and the solvation structure of the electrolyte is regulated and controlled through the dipole-dipole interaction of diaphragm polymer molecules and the electrolyte solvent, so that the desolvation of magnesium ions is accelerated; and thus, the magnesium ion deposition behavior is improved to inhibit the growth of magnesium dendrites, and the cycling stability and safety of the battery are greatly improved.

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.

The invention discloses a flexible magnesium negative electrode interface layer and a preparation method and application thereof, and relates to the technical field of rechargeable magnesium battery negative electrode materials. The flexible magnesium negative electrode interface layer is prepared by coating a magnesium negative electrode with an organic polymer-salt solution; the organic polymer-salt solution comprises an organic polymer and magnesium salt in a mass ratio of (0.1-10): 1.1. According to the invention, the organic polymer-magnesium salt solution is creatively coated on the surface of the metal magnesium foil to prepare the flexible magnesium negative electrode interface layer, and the flexible magnesium negative electrode interface layer has flexibility and self-repairing property, so that the decomposition of electrolyte is avoided, the coulombic efficiency is improved, and the service life of the magnesium negative electrode is prolonged. The preparation process is simple, the applicability is high, and the material is expected to be popularized and applied in rechargeable magnesium negative electrode materials or magnesium secondary battery negative electrode materials.

The invention discloses a halide and phosphate composite electrolyte for a rechargeable magnesium battery as well as a preparation method and application of the halide and phosphate composite electrolyte, and belongs to the technical field of new energy battery preparation. The halide and phosphate composite electrolyte for the rechargeable magnesium battery comprises an electrolyte salt, an organic ether solvent, a phosphate cosolvent and a halide additive. By introducing the halide additive into the organic magnesium salt electrolyte, the solvation structure of magnesium ions in the electrolyte is optimized and regulated, the problem that magnesium metal is extremely easy to passivate is solved, a stable magnesium ion solid electrolyte conducting layer is formed on the surface of the magnesium metal, the conductivity of the magnesium ions is improved, and side reaction between a magnesium negative electrode and the electrolyte is reduced. Meanwhile, the phosphate cosolvent is introduced, so that the corrosivity of the composite electrolyte is reduced, the electrochemical polarization energy barrier is further reduced, and the reversibility and oxidation stability of the rechargeable magnesium battery are improved. The preparation method of the composite electrolyte is simple and easy for large-scale production.

The invention discloses a magnesium-aluminum composite foil and a preparation method and application thereof, and belongs to the technical field of magnesium-aluminum composite materials. The preparation method of the magnesium-aluminum composite foil comprises the following steps: respectively carrying out pre-annealing treatment and surface oxide layer removal on an original magnesium plate and an original aluminum plate to obtain a pre-treated magnesium plate and a pre-treated aluminum plate; the pretreated magnesium plate and the pretreated aluminum plate are heated through pulse current, then single-pass rolling is conducted, and the magnesium-aluminum composite plate is obtained; the magnesium-aluminum composite plate is subjected to first annealing, straightening, multi-pass rolling and intermediate annealing, and a magnesium-aluminum composite strip is obtained; and the magnesium-aluminum composite strip is subjected to second annealing and cold rolling, and the magnesium-aluminum composite foil is obtained. The method is simple and easy to operate, good interface bonding and plate shape control of the magnesium-aluminum composite foil can be realized, and the obtained magnesium-aluminum composite foil has the functional characteristics of light weight, corrosion resistance, good damping, electromagnetic shielding, high energy density and the like, and can be widely applied to the fields of sound vibrating diaphragms, magnesium batteries, electromagnetic shielding and the like.