89 results about "Magnesium battery" patented technology

The invention relates to the technical field of magnesium secondary battery cells, and particularly discloses a magnesium battery tab. Comprising at least two main body parts, a buffer part is arranged between every two adjacent main body parts, the thickness of each buffer part is smaller than that of each main body part, the thickness difference between each buffer part and each main body part is Dn, and Dn is larger than or equal to D / 10 and smaller than or equal to D / 4. According to the invention, the problem of high welding difficulty of multiple layers of pole pieces in the magnesium secondary battery is solved.

The invention belongs to the technical field of magnesium ion batteries, and particularly relates to a magnesium ion battery electrolyte, a preparation method thereof and a magnesium ion battery. The invention provides a magnesium ion battery electrolyte. The magnesium ion battery electrolyte comprises a magnesium salt electrolyte, an amine organic solvent and an imidazole organic solvent. According to the magnesium ion electrolyte, the imidazole and amine organic solvents are used as the mixed cosolvent of the magnesium ion electrolyte, so that the electrolyte magnesium salt can be effectively dissolved, and the problems of decomposition and passivation of the electrolyte solvent and corrosion of a magnesium metal negative electrode can be effectively solved; the amine and imidazole co-soluble magnesium ion electrolyte provided by the invention can realize reversible deposition and dissolution of a magnesium metal negative electrode under the condition of a wide temperature range of-30 to 80 DEG C, and can be applied to a rechargeable magnesium battery.

The application discloses a chlorine-free compound electrolyte for improving magnesium battery performance and a preparation method thereof, and belongs to the technical field of magnesium air battery electrolytes.The chlorine-free compound electrolyte for improving magnesium battery performance is a mixed solution of sodium sulfate, sodium carbonate, 2-methyl imidazole and deionized water.The application first uses sodium sulfate to replace sodium chloride to avoid chlorine ions from accelerating magnesium corrosion;sodium carbonate reacts with a magnesium matrix to form a uniform thin magnesium carbonate layer;and 2-methyl imidazole uses a large Pi bond structure and nitrogen atoms to adsorb positive charge magnesium surfaces to form a dense film layer.The synergistic effect of the three materials can inhibit loose and porous discharge products from being deposited on the anode surface, greatly improve anode utilization efficiency to 87%, and improve the discharge voltage to -1.9 V.The application adjusts the ratio of a solvent to a solute to maximize the improvement of the discharge performance of the air battery;the prepared battery has the advantages of green environmental protection, convenient operation, simple preparation process and the like, and can realize the potential of remote electronic equipment application.

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 relates to the technical field of magnesium secondary batteries, in particular to a magnesium battery cell structure. Comprising a pole piece unit and a pole lug, the pole piece unit comprises two pole piece assemblies, the two pole piece assemblies are located on the two sides of the pole lug respectively, each pole piece assembly comprises at least two pole piece groups, each pole piece group is formed by attaching a plurality of pole pieces, and each 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, buffer parts are arranged between adjacent main body parts, the thickness of the buffer parts is smaller than that of the main body parts, and slopes are arranged between the buffer parts and the main body parts; the welding parts are in one-to-one correspondence with the main body parts and are fixed with the main body parts, 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 pieces. The magnesium battery cell structure provided by the invention solves the problems of large occupied space, high cost and low welding quality of the cell in the existing magnesium secondary battery.

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 magnesium battery rare earth chloride electrolyte as well as a preparation method and a use method thereof, and belongs to the technical field of magnesium air battery electrolytes.The magnesium battery rare earth chloride electrolyte comprises the following components in mole fraction: 0.45-0.65 M of sodium chloride, 0.4-0.6 M of yttrium chloride and 0.4-0.6 M of gadolinium chloride; and the pH value of the electrolyte is 7 + / -0.2. According to the magnesium battery rare earth chloride electrolyte as well as the preparation method and the use method thereof, the problems that a current Mg-0. 2Ca anode material is easy to corrode due to high electrochemical activity, the utilization efficiency of an anode is low, insoluble Mg (OH) 2 is easy to generate and deposit on the surface of the anode in the discharge process, and the discharge voltage of the anode is reduced can be solved; and preparation and use are economical, efficient and environment-friendly.

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.

This invention belongs to the field of electrochemical technology, specifically relating to a method for preparing and applying a low-temperature, high-entropy rechargeable magnesium battery electrolyte. The electrolyte comprises a magnesium salt, a low-melting-point solvent, and a strongly coordinating solvent, wherein the quantities of the magnesium salt, the low-melting-point solvent, and the strongly coordinating solvent are X, Y, and Z, respectively, where X+Y+Z≥5, X≥1, Y≥0, and Z≥1; and the mole fractions of the magnesium salt, the low-melting-point solvent, and the strongly coordinating solvent are Xi, Yi, and Zi, respectively, where Xi≥5%, and must satisfy the quantitative description formula for configuration entropy: S config Let S be the configuration entropy, R be the universal gas constant, and S be the configuration entropy. config With an entropy ≥1.5R, this electrolyte exhibits high entropy. The electrolyte provided by this invention demonstrates good electrochemical performance and stability at low temperatures, and its preparation process is simple.

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 present invention relates to the technical field of battery materials, and particularly relates to a cathode material for a magnesium battery of an anion-variable-valence layered sulfide and a preparation method thereof. The cathode material comprises Mg n V 1‑x Cr x S2, where 0 ≤ n ≤ 0.5 and 0 < x < 1. The specific preparation method is as follows: Take substances containing Mg source, V source, Cr source, and S source, and mix them evenly according to the atomic molar ratio of Mg:V:Cr:S being n:(1 - x):x:2; Place the mixed raw materials in step one in a closed reaction vessel under the protection of an inert gas; Heat the reaction vessel to 600 - 1400 °C, hold for 2 - 72 h, and after cooling, obtain Mg n V 1‑x Cr x S2. Applying Mg n V 1‑x Cr x S2 to the cathode of a magnesium battery can achieve the technical effects of increasing the working voltage of the battery and improving the energy density of the cathode material.

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.