CN112133964A - Magnesium ion electrolyte solution and preparation method thereof - Google Patents

Magnesium ion electrolyte solution and preparation method thereof Download PDF

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Publication number
CN112133964A
CN112133964A CN202011011489.4A CN202011011489A CN112133964A CN 112133964 A CN112133964 A CN 112133964A CN 202011011489 A CN202011011489 A CN 202011011489A CN 112133964 A CN112133964 A CN 112133964A
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magnesium
chloride
electrolyte solution
solution
magnesium ion
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叶瑛
夏天
张平萍
王秋瑾
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Hangzhou Yilaike Technology Co ltd
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Hangzhou Yilaike Technology Co ltd
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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • 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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0568—Liquid materials characterised by the solutes
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0088—Composites
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a magnesium ion electrolyte solution and a preparation method thereof, wherein the electrolyte solution consists of a solvent, a synergist and a magnesium ion carrier. The solvent is organic compound with strong polarity, high dielectric constant and high boiling point, such as dimethyl sulfoxide, dimethylformamide and dimethylacetamide; the synergist is a compound formed by combining imidazole cations and anions; the magnesium ion carrier is one or more of magnesium thiocyanate and organic acid magnesium salt; wherein the weight ratio of the solvent to the synergist is 1:1 to 2:1, and the magnesium ion carrier accounts for 10 to 20 percent of the total weight of the electrolyte solution. The magnesium ion electrolyte solution prepared by the method is suitable for various magnesium ion batteries.

Description

Magnesium ion electrolyte solution and preparation method thereof
Technical Field
The invention belongs to the field of energy sources, and particularly relates to a magnesium ion electrolyte solution and a preparation method thereof.
Background
The magnesium ion battery has energy density similar to that of the lithium ion battery, and is superior to the lithium ion battery in safety performance, comprehensive cost and other aspects, so that the magnesium ion battery is considered as a next-generation power battery which is possible to replace the lithium ion battery. The current research on magnesium ion batteries is mainly focused on electrode materials. Many researchers have attempted to improve the overall energy density and overall performance of the battery by improving carbon cathode materials, with less attention being paid to the electrolyte solution. The development lag of the electrolyte solution has become a bottleneck limiting the magnesium ion battery to enter into commercial application.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a magnesium ion electrolyte solution and a preparation method thereof.
The invention adopts the following specific technical scheme:
the magnesium ion electrolyte solution provided by the invention consists of a solvent, a synergist and a magnesium ion carrier, wherein the weight ratio of the solvent to the synergist is 1: 1-2: 1; the magnesium ionophore accounts for 10-20% of the total weight of the electrolyte solution.
The solvent is a strongly polar, high dielectric constant, high boiling point organic compound, including but not limited to one or more of dimethyl sulfoxide (DMSO), Dimethylformamide (DMF), and Dimethylacetamide (DEF).
The synergist is a compound formed by combining imidazole cations and anions. The imidazole cations are represented by: one or more of 1-ethyl-3-methylimidazole, 1-butyl-3-methylimidazole, 1-hexyl-3-methylimidazole and 1-hexadecyl-3-methylimidazole; the anion is represented by: thiocyanate, trifluoromethanesulfonate, trifluoromethanesulfonic acid, etc. The compound can be a commercial product purchased from the market, and can also be prepared by the following method:
1) dissolving 1-ethyl-3-methylimidazole chloride, or 1-butyl-3-methylimidazole chloride, or 1-hexyl-3-methylimidazole chloride, or 1-hexadecyl-3-methylimidazole chloride in methanol or ethanol to obtain a solution of the imidazole chloride compound.
2) And dissolving the sodium salt, the potassium salt or the ammonium salt of the anion with the mole number equal to that of the imidazole chloride compound in methanol or ethanol to obtain a solution of the sodium salt, the potassium salt or the ammonium salt of the anion.
3) The two solutions were mixed rapidly while stirring, and stirring was continued for 10 to 30 minutes. After standing for 4 to 8 hours, the precipitated chloride is removed by centrifugation or filtration to obtain a clear solution.
4) Heating the clear liquid at a temperature not higher than 100 ℃ until the alcohol solvent is completely evaporated to obtain the corresponding synergist.
The magnesium ionophore is one or more of magnesium thiocyanate and organic acid magnesium salt, including but not limited to magnesium thiocyanate, magnesium trifluoromethanesulfonate and magnesium trifluoromethanesulfonate.
The magnesium organic acid salts such as magnesium thiocyanate, magnesium trifluoromethanesulfonate and magnesium trifluoromethanesulfonate can be commercial products and can also be prepared by the following method:
1) dissolving magnesium chloride in methanol or ethanol to obtain magnesium chloride solution.
2) Dissolving sodium salt, potassium salt or ammonium salt of the anion with twice mole of magnesium chloride in methanol or ethanol to obtain solution of the sodium salt, potassium salt or ammonium salt of the anion.
3) The two solutions were mixed rapidly while stirring, and stirring was continued for 10 to 30 minutes. After standing for 4 to 8 hours, the precipitated chloride is removed by centrifugation or filtration to obtain a clear solution.
4) Heating the clear liquid at a temperature not higher than 100 ℃ until the alcohol solvent is completely evaporated to obtain the corresponding magnesium ionophore.
The preparation method of the magnesium ion electrolyte solution provided by the invention comprises the steps of dissolving the synergist in the solvent, adding the magnesium ion carrier, uniformly mixing and stirring until the synergist is completely dissolved, then heating the solution to 100-140 ℃, and keeping the temperature for 1-4 hours to remove water. Wherein the weight ratio of the solvent to the synergist is 1:1 to 2: 1; the magnesium ionophore accounts for 10-20% of the total weight of the electrolyte solution.
Compared with the prior art, the invention has the following beneficial effects:
the magnesium ion electrolyte solution provided by the invention has the advantages of high electrochemical activity and high conductivity, and is suitable for various magnesium ion batteries, especially sulfur magnesium ion batteries. The magnesium ion battery based on the electrolyte solution has the advantages of high energy density, high cost performance, safety superior to that of a lithium ion battery, rapid charge and discharge and the like, is suitable for being used as a power battery of a passenger vehicle, and can also be used as an energy storage device matched with a renewable energy power generation device.
Detailed Description
The invention will be further illustrated and described with reference to specific embodiments. The technical features of the various implementations may be combined without conflict with each other and do not constitute a limitation to the present invention.
The invention provides a magnesium ion electrolyte solution, which consists of a solvent, a synergist and an ionic carrier, wherein the weight ratio of the solvent to the synergist is 1:1 to 2: 1; the magnesium ionophore accounts for 10-20% of the total weight of the electrolyte solution.
The solvent used is a strongly polar, high dielectric constant, high boiling point organic compound, including but not limited to one or more of dimethyl sulfoxide (DMSO), Dimethylformamide (DMF), and Dimethylacetamide (DEF).
The organic solvent is chemically stable, does not chemically react with other components in the electrolyte solution, and is non-corrosive to the anode and cathode of the battery. The strong polar solvent has strong dissolving capacity to the magnesium ion carrier and the synergist. The use of a high boiling point organic compound as a solvent for the electrolyte solution contributes to the improvement of the safety of the battery. After the solvents are compatible, the freezing point of the solution is greatly reduced due to eutectic effects among the solvents and between the solvents and the synergist, so that the low-temperature performance of the battery is improved.
The synergist is a compound formed by combining imidazole cations and anions. The imidazole cations are represented by: one or more of 1-ethyl-3-methylimidazole, 1-butyl-3-methylimidazole, 1-hexyl-3-methylimidazole and 1-hexadecyl-3-methylimidazole; the anion is represented by: thiocyanate, trifluoromethanesulfonate, trifluoromethanesulfonic acid, etc.
The imidazole compound belongs to an ionic organic compound, and can be dissociated into anions and cations after being dissolved, so that the conductivity of an electrolyte solution can be improved. In addition, after being dissolved in a strong polar organic solvent, imidazole cations can be complexed with anions in a magnesium ion carrier, so that magnesium ions in the solution are activated, and the conductivity of the solution to electrons and ions is improved.
The imidazole compound can be a commercial product purchased from the market, and can also be prepared by the following method:
1) dissolving 1-ethyl-3-methylimidazole chloride, or 1-butyl-3-methylimidazole chloride, or 1-hexyl-3-methylimidazole chloride, or 1-hexadecyl-3-methylimidazole chloride in methanol or ethanol to obtain a solution of the imidazole chloride compound.
The imidazole chloride compound is easy to dissolve in organic solvents such as methanol, ethanol and the like. The solvent used is not limited to methanol and ethanol, but other strongly polar organic solvents may also be used.
2) And dissolving the sodium salt, the potassium salt or the ammonium salt of the anion with the mole number equal to that of the imidazole chloride compound in methanol or ethanol to obtain a solution of the sodium salt, the potassium salt or the ammonium salt of the anion.
Such anions include, but are not limited to, thiocyanate, triflate, trifluoromethanesulfonate, and the like.
3) The two solutions were mixed rapidly while stirring, and stirring was continued for 10 to 30 minutes. After standing for 4 to 8 hours, the precipitated chloride is removed by centrifugation or filtration to obtain a clear solution.
The representative chemical reaction formula in the process is as follows:
C6H11N2Cl+NaSCN＝C6H11N2(SCN)+NaCl↓ (1)
C6H11N2Cl+NaCF3SO3＝C6H11N2(CF3SO3)+NaCl↓ (2)
C6H11N2Cl+NaCF3SO2＝C6H11N2(CF3SO2)+NaCl↓ (3)
imidazole like cations and said anions are dissolved in the clear solution.
4) Heating the clear liquid at a temperature not higher than 100 ℃ until the alcohol solvent is completely evaporated to obtain the corresponding synergist.
To improve the distillation efficiency, reduced pressure distillation is suggested.
The magnesium organic acid salts such as magnesium thiocyanate, magnesium trifluoromethanesulfonate and magnesium trifluoromethanesulfonate can be commercial products and can also be prepared by the following method:
1) dissolving magnesium chloride in methanol or ethanol to obtain magnesium chloride solution.
Magnesium chloride has the property of covalent compound and can be dissolved in alcohol solvent.
2) Dissolving sodium salt, potassium salt or ammonium salt of the anion with twice mole of magnesium chloride in methanol or ethanol to obtain solution of the sodium salt, potassium salt or ammonium salt of the anion.
Such anions include, but are not limited to, thiocyanate, triflate, trifluoromethanesulfonate, and the like.
3) The two solutions were mixed rapidly while stirring, and stirring was continued for 10 to 30 minutes. After standing for 4 to 8 hours, the precipitated chloride is removed by centrifugation or filtration to obtain a clear solution.
The representative chemical reaction formula in the process is as follows:
2NaSCN+MgCl2＝Mg(SCN)2+2NaCl↓ (4)
2NaCF3SO3+MgCl2＝Mg(CF3SO3)2+2NaCl↓ (5)
2NaCF3SO2+MgCl2＝Mg(CF3SO2)2+2NaCl↓ (6)
magnesium ions and the anions are dissolved in the clear solution.
4) Heating the clear liquid at a temperature not higher than 100 ℃ until the alcohol solvent is completely evaporated to obtain the corresponding magnesium ionophore.
To improve the distillation efficiency, reduced pressure distillation is suggested.
In the above magnesium ionophore, magnesium thiocyanate is an essential component, and its weight ratio in the magnesium ionophore is not less than 30%.
The preparation method of the magnesium ion electrolyte solution provided by the invention comprises the steps of dissolving the synergist in the solvent, adding the magnesium ion carrier, uniformly mixing and stirring until the synergist is completely dissolved, then heating the solution to 100-140 ℃, and keeping the temperature for 1-4 hours to remove water. Wherein the weight ratio of the solvent to the synergist is 1:1 to 2: 1; the magnesium ionophore accounts for 10-20% of the total weight of the electrolyte solution.
The synergist is dissolved in the solvent, so that the viscosity of the solvent can be reduced, and the solubility of the magnesium ionophore in the solution can be improved. After the solution is prepared, the solution is stored in a sealed way to prevent moisture absorption; before use, the battery needs to be heated and dehumidified to prevent the electrode of the battery from reacting with water.
The present invention will be described in detail with reference to examples.
Example 1
The synergist is prepared in the embodiment by the following specific processes:
1) 146.62 g of 1-ethyl-3-methylimidazole chloride were dissolved in methanol to give a solution of 1-ethyl-3-methylimidazole chloride.
2) 156.06 g of sodium trifluoromethanesulfonate were dissolved in methanol to give a sodium trifluoromethanesulfonate solution.
3) While stirring, the two solutions were mixed rapidly and stirring was continued for 30 minutes. After standing for 8 hours, removing precipitated sodium chloride by centrifugation or filtration to obtain a clear solution.
4) The clear solution was heated in an oven at 80 ℃ until the methanol was completely evaporated, yielding the trifluoromethanesulphinate of 1-ethyl-3-methylimidazole.
Example 2
The synergist is prepared in the embodiment by the following specific processes:
1) 174.67 g of 1-butyl-3-methylimidazole chloride were dissolved in ethanol to obtain a solution of 1-butyl-3-methylimidazole chloride.
2) 156.06 g of sodium triflate were dissolved in ethanol to give a sodium triflate solution.
3) While stirring, the two solutions were mixed rapidly and stirring was continued for 10 minutes. After standing for 4 hours, the precipitated sodium chloride is removed by centrifugation or filtration to obtain a clear solution.
4) Heating the clear solution in an oven at 100 ℃ until the ethanol is completely evaporated to obtain the trifluoromethanesulfonate of 1-butyl-3-methylimidazole.
Example 3
The synergist is prepared in the embodiment by the following specific processes:
1) 202.72 g of 1-hexyl-3-methylimidazole chloride were dissolved in ethanol to give a solution of 1-hexyl-3-methylimidazole chloride.
2) 76.12 grams of ammonium thiocyanate were dissolved in ethanol to give an ammonium thiocyanate solution.
3) While stirring, the two solutions were mixed rapidly and stirring was continued for 120 minutes. After standing for 6 hours, the precipitated ammonium chloride is removed by centrifugation or filtration to obtain a clear solution.
4) Heating the clear solution in an oven at 90 ℃ until the ethanol is completely evaporated to obtain thiocyanate of 1-hexyl-3-methylimidazole.
Example 4
The synergist is prepared in the embodiment by the following specific processes:
1) 342.99 g of 1-hexadecyl-3-methylimidazole chloride were dissolved in ethanol to obtain a solution of 1-hexadecyl-3-methylimidazole chloride.
2) 97.18 g of potassium thiocyanate were dissolved in ethanol to give a potassium thiocyanate solution.
3) While stirring, the two solutions were mixed rapidly and stirring was continued for 15 minutes. After standing for 5 hours, removing the precipitated potassium chloride by centrifugation or filtration to obtain a clear liquid.
4) Heating the clear solution at a temperature not higher than 100 deg.C until the alcohol solvent is completely evaporated to obtain thiocyanate of 1-hexadecyl-3-methylimidazole.
Example 5
The magnesium ionophore is prepared in the embodiment, and the specific process is as follows:
1) 95.21 g of magnesium chloride were dissolved in ethanol to give a solution of magnesium chloride.
2) 152.24 g of ammonium thiocyanate were mixed with ethanol to obtain an ammonium thiocyanate solution.
3) While stirring, the two solutions were mixed rapidly and stirring was continued for 10 minutes. After standing for 4 hours, the precipitated ammonium chloride is removed by centrifugation or filtration to obtain a clear solution.
4) Heating the clear solution in an oven at 90 ℃ until the ethanol is completely evaporated to obtain magnesium thiocyanate.
Example 6
The magnesium ionophore is prepared in the embodiment, and the specific process is as follows:
1) 95.21 g of magnesium chloride were dissolved in methanol to give a solution of magnesium chloride.
2) 376.34 g of potassium triflate were dissolved in methanol to give a potassium triflate solution.
3) While stirring, the two solutions were mixed rapidly and stirring was continued for 30 minutes. After standing for 8 hours, removing the precipitated potassium chloride by centrifugation or filtration to obtain a clear liquid.
4) The clear solution was heated in an oven at 80 ℃ until the methanol was completely evaporated to give magnesium triflate.
Example 7
The magnesium ionophore is prepared in the embodiment, and the specific process is as follows:
1) 95.21 g of magnesium chloride were dissolved in methanol to give a solution of magnesium chloride.
2) 312.12 g of sodium trifluoromethanesulfonate were dissolved in ethanol to give a sodium trifluoromethanesulfonate solution.
3) While stirring, the two solutions were mixed rapidly and stirring was continued for 20 minutes. After standing for 6 hours, removing precipitated sodium chloride by centrifugation or filtration to obtain a clear solution.
4) Heating the clear solution in an oven at 100 ℃ until the ethanol is completely evaporated to obtain the corresponding magnesium trifluoromethanesulfonate.
Example 8
In this example, using the thiocyanate salt of 1-hexadecyl-3-methylimidazole prepared in example 4 and the magnesium thiocyanate salt prepared in example 5, a magnesium ion electrolyte solution was prepared as follows:
40 g of thiocyanate salt of 1-hexadecyl-3-methylimidazole is dissolved in 40 g of dimethyl sulfoxide, 20 g of magnesium thiocyanate is added, and the mixture is stirred until the magnesium thiocyanate salt is completely dissolved. The solution was then heated to 140 ℃ and held at a constant temperature for 1 hour to remove water, yielding a magnesium ion electrolyte solution.
Example 9
In this example, using the trifluoromethanesulfonate of 1-butyl-3-methylimidazole prepared in example 2 and the magnesium trifluoromethanesulfonate prepared in example 6, a magnesium ion electrolyte solution was prepared as follows:
30 g of the trifluoromethanesulfonate of 1-butyl-3-methylimidazole are dissolved in 60 g of dimethylformamide, 10 g of magnesium trifluoromethanesulfonate are then added, and the mixture is stirred until completely dissolved. Then, the solution was heated to 100 ℃ and kept at a constant temperature for 4 hours to remove water, to obtain a magnesium ion electrolyte solution.
Example 10
This example prepared a magnesium ion electrolyte solution using the trifluoromethanesulphinate of 1-ethyl-3-methylimidazole prepared in example 1 and the magnesium trifluoromethanesulfonate prepared in example 7 as follows:
30 g of trifluoromethanesulphinic acid salt of 1-ethyl-3-methylimidazole are dissolved in 55 g of diethylacetamide, 15 g of magnesium trifluoromethanesulfonate are then added and the mixture is stirred until complete dissolution. Then, the solution was heated to 120 ℃ and kept at a constant temperature for 2 hours to remove water, to obtain a magnesium ion electrolyte solution.
Example 11
In this example, a magnesium ion electrolyte solution was prepared using the thiocyanate salt of 1-hexyl-3-methylimidazole prepared in example 3 and the magnesium thiocyanate salt prepared in example 5, as follows:
30 g of thiocyanate salt of 1-hexyl-3-methylimidazole are dissolved in a mixture of 40 g of dimethyl sulfoxide (DMSO) and 15 g of Dimethylformamide (DMF), 15 g of magnesium thiocyanate are added and stirred until complete dissolution. The solution was then heated to 130 ℃ and held at a constant temperature for 2 hours to remove water, yielding a magnesium ion electrolyte solution.
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.

Claims (7)

1. The magnesium ion electrolyte solution is characterized by comprising a solvent, a synergist and a magnesium ion carrier, wherein the weight ratio of the solvent to the synergist is 1:1 to 2: 1; the magnesium ionophore accounts for 10-20% of the total weight of the electrolyte solution.
2. The magnesium ion electrolyte solution of claim 1, wherein the solvent includes, but is not limited to, one or more of dimethyl sulfoxide (DMSO), Dimethylformamide (DMF), and Dimethylacetamide (DEF).
3. The magnesium electrolyte solution of claim 1 wherein said synergist is a compound of an imidazole-based cation in combination with an anion; the imidazole cation comprises one or more of 1-ethyl-3-methylimidazole, 1-butyl-3-methylimidazole, 1-hexyl-3-methylimidazole and 1-hexadecyl-3-methylimidazole; the anion comprises one or more of thiocyanate, trifluoromethanesulfonate and trifluoromethanesulfonate.
4. The magnesium ion electrolyte solution of claim 3 wherein the enhancer is commercially available or prepared by the following method:
1) dissolving 1-ethyl-3-methylimidazole chloride, or 1-butyl-3-methylimidazole chloride, or 1-hexyl-3-methylimidazole chloride, or 1-hexadecyl-3-methylimidazole chloride in methanol or ethanol to obtain a solution of an imidazole chloride compound;
2) dissolving sodium salt, potassium salt or ammonium salt of the anion with the same mole number as that of the imidazole chloride compound in methanol or ethanol to obtain solution of the sodium salt, potassium salt or ammonium salt of the anion;
3) rapidly mixing the two solutions while stirring, and continuously stirring for 10-30 minutes; standing for 4-8 hours, and centrifuging or filtering to remove the precipitated chloride to obtain clear liquid;
4) heating the clear liquid at a temperature not higher than 100 ℃ until the alcohol solvent is completely evaporated to obtain the corresponding synergist.
5. The magnesium ion electrolyte solution of claim 1, wherein the magnesium ionophore is one or more of magnesium thiocyanate, magnesium salt of organic acid, including but not limited to magnesium thiocyanate, magnesium triflate, magnesium trifluoromethanesulfonate.
6. The magnesium ion electrolyte solution of claim 5 wherein the magnesium ion carrier is commercially available or may be prepared by the following method:
1) dissolving magnesium chloride in methanol or ethanol to obtain a solution of magnesium chloride;
2) dissolving sodium salt, potassium salt or ammonium salt of the anion with twice mole number of magnesium chloride in methanol or ethanol to obtain solution of the sodium salt, potassium salt or ammonium salt of the anion;
3) rapidly mixing the two solutions while stirring, and continuously stirring for 10-30 minutes; standing for 4-8 hours, and centrifuging or filtering to remove the precipitated chloride to obtain clear liquid;
4) heating the clear liquid at a temperature not higher than 100 ℃ until the alcohol solvent is completely evaporated to obtain the corresponding magnesium ionophore.
7. A method for preparing a magnesium ion electrolyte solution according to any one of claims 1 to 6, wherein the synergist is dissolved in the solvent, the magnesium ion carrier is added, the mixture is uniformly mixed and stirred until the synergist is completely dissolved, and then the solution is heated to 100 to 140 ℃ and kept at the constant temperature for 1 to 4 hours to remove water.
CN202011011489.4A 2020-09-23 2020-09-23 Magnesium ion electrolyte solution and preparation method thereof Pending CN112133964A (en)

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Cited By (1)

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CN114552019A (en) * 2022-03-18 2022-05-27 杭州怡莱珂科技有限公司 Complex anion sodium salt and preparation method and use method thereof

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