CN114497535A - A laminated structure of alpha-Ni (OH)2Magnesium ion battery with positive electrode and preparation method thereof - Google Patents
A laminated structure of alpha-Ni (OH)2Magnesium ion battery with positive electrode and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims description 8
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229910001425 magnesium ion Inorganic materials 0.000 claims abstract description 56
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000011777 magnesium Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 16
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims description 15
- 239000003792 electrolyte Substances 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 239000006258 conductive agent Substances 0.000 claims description 7
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 5
- 239000011159 matrix material Substances 0.000 abstract description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 32
- 229910001416 lithium ion Inorganic materials 0.000 description 15
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 14
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 11
- 229910052744 lithium Inorganic materials 0.000 description 11
- 150000002500 ions Chemical class 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910006527 α-Ni(OH)2 Inorganic materials 0.000 description 4
- 238000005303 weighing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- -1 Transition metal sulfides Chemical class 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 239000010405 anode material Substances 0.000 description 2
- 230000001351 cycling effect Effects 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 229910032387 LiCoO2 Inorganic materials 0.000 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910001413 alkali metal ion Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 125000005587 carbonate group Chemical group 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/46—Alloys based on magnesium or aluminium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
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- H—ELECTRICITY
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The scheme discloses a layered structure alpha-Ni (OH) in the technical field of magnesium ion batteries2The magnesium ion battery of the positive pole comprises the positive pole, the negative pole and a diaphragm, wherein the positive pole comprises alpha-Ni (OH)2The cathode is made of unoxidized magnesium sheets. Aiming at the problems of serious capacity attenuation and poor rate capability caused by difficult embedding and removing of divalent magnesium ions of a magnesium ion battery system. The patent selects alpha-Ni (OH) with a layered structure for the first time2As the positive electrode of the magnesium ion battery, magnesium ions in the charging and discharging processIn the presence of alpha-Ni (OH)2The material can be reversibly embedded and separated, so that the coulomb acting force between magnesium ions and a matrix material is reduced, the capacity attenuation of the anode is inhibited, and the rate capability of the anode is improved.
Description
Technical Field
The invention belongs to the technical field of magnesium ion batteries, and particularly relates to a lamellar structure alpha-Ni (OH)2A magnesium ion battery of a positive electrode and a preparation method thereof.
Background
The commercial application of the lithium ion battery relieves the consumption of primary energy, but the lithium ion battery still has the problems of safety, lithium resource shortage and the like at the present stage. In the aspect of safety, a large amount of lithium ions are remained in the positive electrode after the lithium ion battery is fully charged, and when the lithium ion battery is overcharged, the lithium ions remained in the positive electrode can flow to the negative electrode to form dendrites on the negative electrode, and pierce through the diaphragm to form internal short circuit. In addition, the main component of the electrolyte of the lithium ion battery is carbonate, the flash point and the boiling point are low, and the electrolyte can be burnt or even exploded under certain conditions. In terms of lithium resource consumption, lithium used in the battery industry is increasingly dominating the total amount of lithium consumed worldwide, resulting in an increase in the price of lithium carbonate. Considering only electric cars, 511 ten thousand tons of lithium will be consumed in 2015 to 2050, which accounts for almost one third of the lithium on land. In 2080, the lithium resources on the land would be completely depleted. Lithium on land is limited and abundant lithium in the ocean cannot be efficiently extracted due to low concentration. Therefore, there is a great interest in developing lithium-substituted metal energy storage batteries with high energy density, safety, environmental protection and abundant resources.
The rechargeable magnesium ion battery is considered as a potential substitute energy storage device of the lithium ion battery, the composition of the magnesium ion battery is similar to that of the lithium ion battery, the positive electrode is a reversible magnesium storage material, the negative electrode is a magnesium metal negative electrode, the electrolyte is a magnesium-containing organic solution, the charge and discharge principle of the magnesium ion battery is consistent with that of the lithium ion battery, and magnesium ions are inserted into and separated from the positive electrode, dissolved and deposited in the negative electrode. Compared with a lithium ion battery, the magnesium ion battery has the following advantages: (1) the safety is high. As negative of batteryThe surface of magnesium metal does not have magnesium dendrite, so that the problem of short circuit in the battery can be avoided, and the combustion and explosion of the battery can be avoided; (2) rich resources and low cost. As one of the most abundant light metals on earth, magnesium is present in the earth's crust at 2% or more (about 0.0065% or less) than lithium. Meanwhile, magnesium exists in a large amount of evaporative mineral resources (seawater and salt lakes), so that the exploitation cost is relatively low, and the cost of the magnesium ion battery is only two thirds of that of the lithium ion battery under the same volume; and (3) the performance is strong. The magnesium ion battery has the advantages of equivalent volume specification, 3 times of energy of the lithium ion battery and 10 times of energy of the lead-acid battery, wide application range and almost coverage of the application range of the lithium ion battery. At present, reports about magnesium ion battery anodes mainly focus on Chevrel phase (Mo)6S8) Transition metal sulfides/oxides (e.g.: CuS and V2O5) And polyanionic compounds. Due to the strong coulomb acting force between the divalent magnesium ions and the matrix material, the magnesium ions are difficult to be embedded or removed from the anode material in the charge-discharge process, so that the capacity attenuation of the conversion type anode is serious and the multiplying power performance is not ideal. Using materials with layered structure for storing magnesium, e.g. Mo6S8As a positive electrode of a magnesium ion battery, Mo6S8The material has good cycling stability, and after 2000 weeks of cycling, the capacity retention rate of the material reaches 85%. But is limited by 122mAh g-1Theoretical capacity of (1), Mo is selected6S8The magnesium ion battery anode can not meet the requirement of the modern society on the energy density of the battery. Meanwhile, the rare metal Mo is expensive, so that Mo is limited6S8The commercialization of positive magnesium ion batteries has progressed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a layered structure alpha-Ni (OH)2A magnesium ion battery with a positive electrode.
The scheme has a layered structure of alpha-Ni (OH)2The magnesium ion battery of the positive pole comprises the positive pole, the negative pole and a diaphragm, wherein the positive pole comprises alpha-Ni (OH)2The negative electrode adopts unoxidized negative electrodeA magnesium sheet.
Further, the alpha-Ni (OH) is calculated according to the weight portion25-9 parts of material, 1-3 parts of conductive agent and 0.5-2 parts of adhesive.
The invention also provides a layered structure alpha-Ni (OH)2The preparation method of the magnesium ion battery of the positive electrode comprises the following steps:
step one, manufacturing a positive plate: reacting said alpha-Ni (OH)2Mixing the powder, the conductive agent and the adhesive according to a ratio to obtain anode powder, and adding an N-methyl pyrrolidone solvent into the obtained anode powder to mix into slurry; coating the slurry on a current collecting sheet with the thickness of 0.9-1.2 mu m, and drying at 80-180 ℃ to obtain a positive plate;
step two, preparing a magnesium sheet, purifying the surface of the magnesium sheet, and drying to obtain a negative plate;
and step three, winding the positive plate obtained in the step one, the negative plate obtained in the step two and the diaphragm into a spiral shape in sequence, filling the spiral shape into a battery shell made of aluminum, sealing the shell after filling electrolyte, and then forming the finished battery.
The working principle of the scheme is as follows: aiming at the problems of serious capacity attenuation and poor rate capability caused by difficult embedding and removing of divalent magnesium ions of a magnesium ion battery system. The patent selects alpha-Ni (OH) with a layered structure for the first time2As the positive electrode of the magnesium ion battery, the magnesium ion is in alpha-Ni (OH) in the charging and discharging process2The material can be reversibly embedded and separated, so that the coulomb acting force between magnesium ions and a matrix material is reduced, the capacity attenuation of the anode is inhibited, and the rate capability of the anode is improved.
And (3) charging process: under the influence of an applied electric field, Mg2+Ion from Ni (OH)2The interlayer of the material is separated and enters into the electrolyte. Mg (magnesium)2+The ions diffuse in the electrolyte and then reach the Mg cathode, and are reduced into metal Mg after absorbing electrons.
And (3) discharging: during discharge, Mg2+The movement of the ions is opposite to the charging, and Mg loses electrons to become Mg2+Ions from the negative electrode back to the positive electrode inserting Ni (OH)2Between layers of material. Electrons return from the external circuit to the positive electrode, formingThe current provides energy to the load.
The beneficial technical effects of the invention are as follows: lamellar alpha-Ni (OH)2Theoretical capacity of (C)α-Ni(OH)2＝459mA h g-1Compared with Mo6S8Is nearly 4 times higher than the theoretical capacity (C) of the lithium battery anode material which is mainstream at presentLiCoO2＝274mA h g-1, CLiFePO4＝170mA h g-1,CLiMn2O4＝148mA h g-1) The improvement is also obvious. By high-capacity lamellar structures of alpha-Ni (OH)2The material replaces the prior low-capacity Mo6S8The material or conversion type material (sulfide/oxide, etc.) is used as the positive electrode of the magnesium ion battery, so that the energy density of the magnesium ion battery is improved while the difficulty of embedding/extracting magnesium ions in the positive electrode is solved.
In addition, the content of nickel in the earth crust is second to silicon, oxygen, iron and magnesium, and the fifth place is rich in resources of alpha-Ni (OH)2The material further reduces the cost of the magnesium ion battery. Furthermore, a dendrite-free magnesium metal negative electrode (C)Mg＝2205mA h g-1) The use of (a) significantly improves the mass/volume energy density of the magnesium battery. Thus, the layered alpha-Ni (OH)2The use of the positive electrode develops better practicability of the magnesium ion battery.
Drawings
FIG. 1 shows the present invention, alpha-Ni (OH)2The structure and the working principle of the positive magnesium ion battery are schematically shown;
FIG. 2 shows a-Ni (OH)2Schematic structural diagram of (1).
Detailed Description
The following is further detailed by way of specific embodiments:
example 1: a laminated structure of alpha-Ni (OH)2The preparation method of the magnesium ion battery of the positive electrode comprises the following steps:
step one, manufacturing a positive plate: weighing alpha-Ni (OH) according to the weight portion ratio25 parts of powder, 1 part of conductive agent and 0.5 part of adhesive are mixed to obtain anode powder, and N-methyl pyrrolidone solvent is added into the obtained anode powder to be mixed into slurry; then the obtained slurry is uniformly coated on the surfaceDrying the current collecting sheet with the diameter of 1 mu m at 140 ℃ to obtain a positive plate;
step two, preparing a magnesium sheet, purifying the surface of the magnesium sheet, and drying to obtain a negative plate;
and step three, winding the positive plate obtained in the step one, the negative plate obtained in the step two and the diaphragm into a spiral shape in sequence, filling the spiral shape into a battery shell made of aluminum, sealing the shell after filling electrolyte, and then forming the finished battery.
Example 2: a laminated structure of alpha-Ni (OH)2The preparation method of the magnesium ion battery of the positive electrode comprises the following steps:
step one, manufacturing a positive plate: weighing alpha-Ni (OH) according to the weight portion ratio2Mixing 7 parts of powder, 2 parts of conductive agent and 1 part of adhesive to obtain anode powder, and adding N-methylpyrrolidone solvent into the anode powder to mix into slurry; then uniformly coating the obtained slurry on a current collecting sheet with the density of 0.9 mu m, and drying at 80 ℃ to obtain a positive plate;
step two, preparing a magnesium sheet, purifying the surface of the magnesium sheet, and drying to obtain a negative plate;
and step three, winding the positive plate obtained in the step one, the negative plate obtained in the step two and the diaphragm into a spiral shape in sequence, filling the spiral shape into a battery shell made of aluminum, sealing the shell after filling electrolyte, and then forming the finished battery.
Example 3: a laminated structure of alpha-Ni (OH)2The preparation method of the magnesium ion battery of the positive electrode comprises the following steps:
step one, manufacturing a positive plate: weighing alpha-Ni (OH) according to the weight portion ratio29 parts of powder, 3 parts of conductive agent and 2 parts of adhesive are mixed to obtain anode powder, and N-methyl pyrrolidone solvent is added into the obtained anode powder to be mixed into slurry; then uniformly coating the obtained slurry on a current collecting sheet with the density of 1.2 mu m, and drying at 180 ℃ to obtain a positive plate;
step two, preparing a magnesium sheet, purifying the surface of the magnesium sheet, and drying to obtain a negative plate;
and step three, winding the positive plate obtained in the step one, the negative plate obtained in the step two and the diaphragm into a spiral shape in sequence, filling the spiral shape into a battery shell made of aluminum, sealing the shell after filling electrolyte, and then forming the finished battery.
FIG. 1 shows the scheme of the invention with alpha-Ni (OH)2Is a positive electrode, Mg metal is a negative electrode, 0.6M Mg [ B (HFIP)4]2The structure and the working principle of the magnesium ion battery with/DME as electrolyte, and the electrochemical reaction in the charging and discharging process is shown as the formulas (1), (2) and (3).
The electrochemical reaction during charge and discharge is shown in formulas (1), (2) and (3):
and (3) positive pole reaction:
and (3) cathode reaction:
and (3) total reaction:
and (3) charging process: under the influence of an applied electric field, Mg2+Ion from Ni (OH)2The interlayer of the material is separated and enters into the electrolyte. Mg (magnesium)2+The ions diffuse in the electrolyte and then reach the Mg cathode, and are reduced into metal Mg after absorbing electrons.
And (3) discharging: during discharge, Mg2+The movement of the ions is opposite to the charging, and Mg loses electrons to become Mg2+Ions from the negative electrode back to the positive electrode inserting Ni (OH)2Between layers of material. The electrons return from the external circuit to the positive pole, creating a current that energizes the load.
α-Ni(OH)2Has a layer spacing of
Allowing some anions such as NO3 -、CO3 2-And alkali metal ions of relatively small radius such as Li+、Mg2+、K+Between the layers (as shown in FIG. 2), Mg2+Has an ionic radius of
α-Ni(OH)2The wider interlayer spacing satisfies the intercalation of magnesium ions. Meanwhile, the electrostatic attraction of interlayer anions and magnesium ions can solve divalent magnesium ions and alpha-Ni (OH) to a great extent2The coulomb interaction existing between the matrix materials promotes the magnesium ions to realize the reaction from alpha-Ni (OH) in the charge and discharge process2The material can be reversibly embedded in/separated from the magnesium battery, so that the capacity of the magnesium battery is prevented from being rapidly attenuated, and the rate capability of the battery is improved. Resource-rich alpha-Ni (OH)2Is relatively Mo6S8The cathode material is cheaper and the capacity is nearly 4 times higher (C)α-Ni(OH)2＝459mA h g-1， CMo6S8＝122mAh g-1) And the energy density of the magnesium ion battery is improved.
Claims (3)
1. A laminated structure of alpha-Ni (OH)2The magnesium ion battery of positive pole, its characterized in that: comprises a positive electrode, a negative electrode and a diaphragm, wherein the positive electrode comprises alpha-Ni (OH)2The cathode is made of unoxidized magnesium sheets.
2. A layered structure of α -ni (oh) according to claim 12The magnesium ion battery of positive pole, its characterized in that: the alpha-Ni (OH) is calculated according to the weight portion25-9 parts of material, 1-3 parts of conductive agent and 0.5-2 parts of adhesive.
3. A layered structure according to claim 1 or 2 a-ni (oh)2The preparation method of the magnesium ion battery of the positive electrode is characterized by comprising the following steps:
step one, manufacturing a positive plate: reacting said alpha-Ni (OH)2Mixing the powder, the conductive agent and the adhesive according to a ratio to obtain anode powder, and adding an N-methyl pyrrolidone solvent into the obtained anode powder to mix into slurry; coating the slurry on a current collecting sheet with the thickness of 0.9-1.2 mu m, and drying at 80-180 ℃ to obtain a positive plate;
step two, preparing a magnesium sheet, purifying the surface of the magnesium sheet, and drying to obtain a negative plate;
and step three, winding the positive plate obtained in the step one, the negative plate obtained in the step two and the glass fiber diaphragm into a spiral shape in sequence, filling the spiral shape into a battery shell made of aluminum, sealing the shell after adding electrolyte, and then forming the finished battery.
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