CN115084652A - Composite rechargeable magnesium battery electrolyte and preparation method thereof - Google Patents
Composite rechargeable magnesium battery electrolyte and preparation method thereof Download PDFInfo
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- CN115084652A CN115084652A CN202210879412.1A CN202210879412A CN115084652A CN 115084652 A CN115084652 A CN 115084652A CN 202210879412 A CN202210879412 A CN 202210879412A CN 115084652 A CN115084652 A CN 115084652A
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 95
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 239000011777 magnesium Substances 0.000 title claims abstract description 53
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 51
- 239000002131 composite material Substances 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000003960 organic solvent Substances 0.000 claims abstract description 43
- 239000000654 additive Substances 0.000 claims abstract description 25
- 150000003839 salts Chemical class 0.000 claims abstract description 19
- 230000000996 additive effect Effects 0.000 claims abstract description 17
- 239000012535 impurity Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 22
- 150000001412 amines Chemical class 0.000 claims description 11
- 229920013821 hydroxy alkyl cellulose Polymers 0.000 claims description 10
- 159000000003 magnesium salts Chemical class 0.000 claims description 10
- 159000000000 sodium salts Chemical class 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 9
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 239000012621 metal-organic framework Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 claims description 4
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 claims description 4
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 3
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical class CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- BZQRBEVTLZHKEA-UHFFFAOYSA-L magnesium;trifluoromethanesulfonate Chemical compound [Mg+2].[O-]S(=O)(=O)C(F)(F)F.[O-]S(=O)(=O)C(F)(F)F BZQRBEVTLZHKEA-UHFFFAOYSA-L 0.000 claims description 3
- 235000013024 sodium fluoride Nutrition 0.000 claims description 3
- 239000011775 sodium fluoride Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000013154 zeolitic imidazolate framework-8 Substances 0.000 claims description 3
- MFLKDEMTKSVIBK-UHFFFAOYSA-N zinc;2-methylimidazol-3-ide Chemical compound [Zn+2].CC1=NC=C[N-]1.CC1=NC=C[N-]1 MFLKDEMTKSVIBK-UHFFFAOYSA-N 0.000 claims description 3
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 claims description 2
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 claims description 2
- 239000001863 hydroxypropyl cellulose Substances 0.000 claims description 2
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 claims description 2
- QWDJLDTYWNBUKE-UHFFFAOYSA-L magnesium bicarbonate Chemical compound [Mg+2].OC([O-])=O.OC([O-])=O QWDJLDTYWNBUKE-UHFFFAOYSA-L 0.000 claims description 2
- IMFACGCPASFAPR-UHFFFAOYSA-N tributylamine Chemical class CCCCN(CCCC)CCCC IMFACGCPASFAPR-UHFFFAOYSA-N 0.000 claims description 2
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000004090 dissolution Methods 0.000 abstract description 13
- 239000002994 raw material Substances 0.000 abstract description 8
- 238000003860 storage Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000011888 foil Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 5
- 229910052750 molybdenum Inorganic materials 0.000 description 5
- 239000011733 molybdenum Substances 0.000 description 5
- 230000002441 reversible effect Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 description 3
- 239000008151 electrolyte solution Substances 0.000 description 3
- 229940021013 electrolyte solution Drugs 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000000306 component Substances 0.000 description 2
- 238000002484 cyclic voltammetry Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001453 impedance spectrum Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007614 solvation Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012546 transfer Methods 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
- 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
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a composite rechargeable magnesium battery electrolyte and a preparation method thereof. The electrolyte contains an organic solvent, electrolyte salt and an additive; in the preparation process, the raw materials are not subjected to any water removal and impurity removal pretreatment, and are directly stirred and uniformly mixed under the inert atmosphere at room temperature to obtain the electrolyte. The composite electrolyte has the advantages of high conductivity, small overpotential, high magnesium deposition-dissolution efficiency and high tolerance to water and impurities, obviously reduces the cost of the electrolyte, simplifies the preparation process of the electrolyte, provides great convenience for the storage and use of the electrolyte, and is beneficial to commercialization of rechargeable magnesium batteries.
Description
Technical Field
The invention belongs to the technical field of rechargeable magnesium batteries, and particularly relates to a composite rechargeable magnesium battery electrolyte and a preparation method thereof.
Background
The rechargeable magnesium battery has the advantages of high safety, rich magnesium reserve of raw materials, high specific volume capacity and the like, and is considered to be one of novel energy storage technologies with the most development potential in the post lithium ion battery era. The electrolyte is used as a core component of the rechargeable magnesium battery and has important influence on the performance of the battery. The electrolyte of the rechargeable magnesium battery mainly comprises an organic solvent and electrolyte salt. Similar to electrolytes of rechargeable lithium or sodium (ion) batteries and the like, rechargeable magnesium battery electrolytes are very sensitive to water and impurities, and the presence of trace amounts of water and impurities can seriously affect the battery performance. Therefore, the preparation of the electrolyte of the rechargeable magnesium battery requires the prior anhydrous and oxygen-free treatment of the organic solvent and the use of anhydrous high-purity electrolyte salt as the raw material, which causes high cost of the electrolyte, tedious and tedious preparation process, and inconvenience for the storage and use of the electrolyte, and becomes a serious obstacle for the development and commercialization of the rechargeable magnesium battery.
The electrolyte of the rechargeable magnesium battery, which has high tolerance on water and impurities, is large in conductivity, small in overpotential and high in magnesium deposition-dissolution efficiency, can ensure the excellent performances of the electrolyte and the battery, can remarkably reduce the cost of the electrolyte, simplify the preparation process of the electrolyte and facilitate the storage and use of the electrolyte, and has important promotion effect on the development and commercial application of the rechargeable magnesium battery.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, the present invention provides a composite rechargeable magnesium battery electrolyte with high tolerance to water and impurities.
The invention also provides a preparation method of the composite rechargeable magnesium battery electrolyte.
The invention adopts the following technical scheme:
the composite rechargeable magnesium battery electrolyte is characterized by comprising an organic solvent, electrolyte salt and an additive, wherein the total molar concentration of the electrolyte salt in the organic solvent is 1.1-1.5 mol/L, and the total mass percentage concentration of the additive in the organic solvent is 0.5-2.0 wt%.
Further, the organic solvent is prepared from a chain ether organic solvent and a perfluorinated amine organic solvent according to a volume ratio of 1: 0.25 to 1; the electrolyte salt is prepared from organic magnesium salt and inorganic sodium salt according to the mass ratio of 1: 0.5 to 1; the additive is prepared from a metal organic framework substance and a hydroxyalkyl cellulose substance according to the mass ratio of 1: 1 to 3.
Further, the chain ether organic solvent is any one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether; the perfluorinated amine organic solvent is any one of perfluorinated triethylamine or perfluorinated tributylamine.
Further, the organic magnesium salt in the electrolyte salt is any one of magnesium trifluoromethanesulfonate or magnesium bis (trifluoromethanesulfonylimide); the inorganic sodium salt in the electrolyte salt is any one of sodium fluoride or sodium bromide.
Further, the metal organic framework substance in the additive is any one of ZIF-8 or ZIF-67; the hydroxyalkyl cellulose substance in the additive is any one of hydroxyethyl cellulose or hydroxypropyl cellulose.
The invention also provides a preparation method of the composite rechargeable magnesium battery electrolyte, which comprises the following steps:
preparing materials according to the components; under the inert atmosphere at room temperature, measuring a chain ether organic solvent and a perfluorinated amine organic solvent, and uniformly mixing the chain ether organic solvent and the perfluorinated amine organic solvent to obtain a composite organic solvent; weighing organic magnesium salt, inorganic sodium salt, metal organic frame additives and hydroxyalkyl cellulose additives, slowly adding the organic magnesium salt, the inorganic sodium salt, the metal organic frame additives and the hydroxyalkyl cellulose additives into the composite organic solvent in sequence, and magnetically stirring for 48-60 hours to obtain the electrolyte.
Furthermore, the organic solvent, electrolyte salt and additive of the raw materials do not need any water removal and impurity removal pretreatment.
Compared with the prior art, the invention has the following beneficial effects:
1. the composite rechargeable magnesium battery electrolyte contains a double organic solvent, a double electrolyte salt and a double additive; the double organic solvent composed of the chain ether solvent and the perfluorinated amine solvent can adjust the polarity of the solvent, increase the solubility of electrolyte salt and enhance the stability of the electrolyte; the double electrolyte salt composed of the organic magnesium salt and the inorganic sodium salt can increase the concentration of the electrolyte salt, improve the conductivity of the electrolyte, is beneficial to improving the solvation environment of magnesium ions, promoting the charge transfer of an electrode-electrolyte interface, reducing the overpotential of magnesium deposition-dissolution and improving the cycle stability; the double additive composed of the metal organic framework substance and the hydroxyalkyl cellulose substance can effectively prevent water and impurities from approaching an electrode-electrolyte interface region based on the confinement and adsorption effects, and ensures the stability of the interface.
2. The synergistic effect among the components of the composite electrolyte has the characteristics of high conductivity, small overpotential and high magnesium deposition-dissolution efficiency, particularly has high tolerance on water and impurities, obviously reduces the cost of the electrolyte, simplifies the preparation process of the electrolyte, provides great convenience for the storage and use of the electrolyte, and has good application prospect.
3. The preparation of the composite rechargeable magnesium battery electrolyte does not need any water removal and impurity removal pretreatment on raw materials, only adopts a room-temperature stirring mode, has simple process, and is easy for large-scale industrial production.
Drawings
FIG. 1 shows the results of electrochemical impedance spectroscopy of the electrolyte prepared in example 1 of the present invention.
FIG. 2 is a cyclic voltammogram of the electrolyte prepared in example 1 of the present invention using a molybdenum foil as a working electrode.
FIG. 3 shows that the electrolyte prepared in example 1 of the present invention is 0.5mA cm with molybdenum foil as the working electrode -2 Magnesium reversible deposition-dissolution coulombic efficiency at current density.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Composite rechargeable magnesium battery electrolyte and preparation method thereof
Example 1:
the preparation method of the composite rechargeable magnesium battery electrolyte comprises the following steps:
under the inert atmosphere at room temperature, respectively measuring 80mL of ethylene glycol dimethyl ether and 20mL of perfluorinated triethylamine, and uniformly mixing the two to obtain a composite organic solvent; 32.244g of magnesium trifluoromethanesulfonate, 2.100g of sodium fluoride, 0.520g of ZIF-8 and 1.560g of hydroxyethyl cellulose are respectively weighed, slowly added into the composite organic solvent in sequence, and stirred by magnetic force for 48 hours, so that the composite rechargeable magnesium battery electrolyte is obtained.
The raw materials are purchased and then directly used without any water removal and impurity removal pretreatment.
Examples 2 to 4:
the composite rechargeable magnesium battery electrolyte is prepared by the same method as the embodiment 1, and comprises the following steps:
respectively measuring a certain volume of chain ether organic solvent and perfluorinated amine organic solvent under the inert atmosphere at room temperature, and uniformly mixing the chain ether organic solvent and the perfluorinated amine organic solvent to obtain a composite organic solvent; respectively weighing organic magnesium salt, inorganic sodium salt, metal organic frame additive and hydroxyalkyl cellulose additive with certain mass, sequentially and slowly adding into the composite organic solvent, and magnetically stirring for a certain time to obtain the composite rechargeable magnesium battery electrolyte.
All raw materials are directly used after being purchased without any water removal and impurity removal pretreatment.
The electrolyte (in 100 mL) of examples 2-4 was prepared under the conditions shown in table 1 below:
TABLE 1
Second, performance test method for low-temperature electrolyte of composite rechargeable magnesium battery
a. Conductivity test of electrolyte
The conductivity of the electrolyte is obtained by analyzing the electrochemical impedance spectrum at the open circuit potential. Electrochemical impedance spectroscopy testing was done using an Autolab PGSTAT302N electrochemical workstation. Adopts a three-electrode system, uses clean stainless steel foil (14mm thick) as a reference electrode, a working electrode and a counter electrode,the applied excitation signal is 5mV, and the test frequency range is 10 5 Hz to 0.01Hz, and the testing temperature is room temperature. Obtaining the electrolyte bulk resistance R from the measured impedance spectrum s (Ω), and further the electrolyte conductivity (σ, S/cm) is obtained by the following defined formula of conductivity:
σ＝l/SR s
wherein l is the thickness of the electrolyte, cm; s is the contact area of the electrolyte and the electrode in cm 2 。
b. Magnesium reversible deposition-dissolution performance test of electrolyte
The magnesium reversible deposition-dissolution performance of the electrolyte is tested by cyclic voltammetry and is completed by using an Autolab PGSTAT302N electrochemical workstation. The clean magnesium sheet electrode is used as a reference electrode, a counter electrode and a molybdenum foil as a working electrode, the potential range is-0.8-1.8V, and the sweep rate is 25 mV/s.
c. Magnesium reversible deposition-dissolution coulombic efficiency test
Reversible deposition-dissolution coulombic efficiency of magnesium in electrolyte was tested by assembling CR2032 button cells. Assembly was performed in an inert atmosphere glove box. The working electrode is a clean molybdenum foil, the counter electrode is a clean magnesium sheet (simultaneously used as a reference electrode), and the diaphragm adopts a GF/A film and is assembled with a self-made electrolyte into the CR2032 type button cell. After the battery is assembled, the battery is kept stand for 12 hours at room temperature, and then a Neware instrument is utilized to carry out constant current charge and discharge test, wherein the current density is 0.5mAcm -2 Discharged for 60min, and then charged to 0.8V (vs. Mg/Mg) 2+ ) Coulombic efficiency was calculated from the ratio of the amount of magnesium deposited to the amount of magnesium dissolved in one cycle.
As shown in FIG. 1, the electrochemical impedance spectroscopy result of the electrolyte prepared in example 1 was analyzed to obtain an electrolyte having a conductivity of 5.24mS cm -1 . The conductivity of the electrolyte of the rechargeable magnesium battery reported in the literature at present is generally lower than 5.0mS cm -1 The electrolyte has the characteristic of high conductivity.
As shown in figure 2, the overpotential after the electrolyte circulates for 150 circles is 127mV by using the molybdenum foil as the working electrode, which shows that the electrolyte has the characteristic of small magnesium deposition-dissolution overpotential.
As shown in fig. 3, the coulombic efficiency of the electrolyte solution in the long-term circulation for 1000 cycles was maintained at 98.2%, indicating that the electrolyte solution has the characteristic of high magnesium deposition-dissolution efficiency.
Also, the electrolyte solutions prepared in examples 2 to 4 were subjected to the performance test using the above-described method, and the results are shown in Table 2. Further proves that the electrolyte has the characteristics of high conductivity, small overpotential and high magnesium deposition-dissolution efficiency.
TABLE 2
In conclusion, the composite rechargeable magnesium battery electrolyte prepared by the invention has the characteristics of high conductivity, small overpotential and high magnesium deposition-dissolution efficiency, particularly has very high tolerance on water and impurities, obviously reduces the cost of the electrolyte, simplifies the preparation process of the electrolyte, provides great convenience for the storage and use of the electrolyte, and has good commercial application prospect. In addition, the electrolyte is prepared by only adopting a room-temperature stirring mode without any water removal and impurity removal pretreatment on the raw materials, and the process is simple and is easy for large-scale industrial production.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (7)
1. The composite rechargeable magnesium battery electrolyte is characterized by comprising an organic solvent, electrolyte salt and an additive, wherein the total molar concentration of the electrolyte salt in the organic solvent is 1.1-1.5 mol/L, and the total mass percentage concentration of the additive in the organic solvent is 0.5-2.0 wt%.
2. The composite rechargeable magnesium battery electrolyte as claimed in claim 1, wherein the organic solvent is a mixture of a chain ether organic solvent and a perfluorinated amine organic solvent in a volume ratio of 1: 0.25 to 1; the electrolyte salt is prepared from organic magnesium salt and inorganic sodium salt according to the mass ratio of 1: 0.5 to 1; the additive is prepared from a metal organic framework substance and a hydroxyalkyl cellulose substance according to the mass ratio of 1: 1 to 3.
3. The compound rechargeable magnesium battery electrolyte as claimed in claim 2, wherein the chain ether organic solvent is any one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether; the perfluorinated amine organic solvent is any one of perfluorinated triethylamine or perfluorinated tributylamine.
4. The composite rechargeable magnesium battery electrolyte as claimed in claim 2, wherein the organic magnesium salt in the electrolyte salt is any one of magnesium trifluoromethanesulfonate or magnesium bis (trifluoromethanesulfonylimide); the inorganic sodium salt in the electrolyte salt is any one of sodium fluoride or sodium bromide.
5. The composite rechargeable magnesium battery electrolyte as claimed in claim 2, wherein the metal organic frame in the additive is any one of ZIF-8 or ZIF-67; the hydroxyalkyl cellulose substance in the additive is one of hydroxyethyl cellulose and hydroxypropyl cellulose.
6. The preparation method of the composite rechargeable magnesium battery electrolyte is characterized by comprising the following steps of:
preparing a composition according to any one of claims 1 to 5; under the inert atmosphere at room temperature, measuring a chain ether organic solvent and a perfluorinated amine organic solvent, and uniformly mixing the chain ether organic solvent and the perfluorinated amine organic solvent to obtain a composite organic solvent; weighing organic magnesium salt, inorganic sodium salt, metal organic frame additives and hydroxyalkyl cellulose additives, slowly adding the organic magnesium salt, the inorganic sodium salt, the metal organic frame additives and the hydroxyalkyl cellulose additives into the composite organic solvent in sequence, and magnetically stirring for 48-60 hours to obtain the electrolyte.
7. The method for preparing the composite rechargeable magnesium battery electrolyte as claimed in claim 6, wherein the organic solvent, the electrolyte salt and the additive are prepared without any water removal and impurity removal pretreatment.
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| 王瑛;王雅丽;赵成龙;陈良;徐守冬;张鼎;: "基于金属有机骨架氧化物模板法的空心NiO的制备及其储钠电化学性能", 广东化工, no. 19, 15 October 2016 (2016-10-15), pages 27 - 30 * |
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