CN116914262A - High-temperature organic electrolyte applicable to Prussian Bai Zheng electrode material - Google Patents
High-temperature organic electrolyte applicable to Prussian Bai Zheng electrode material Download PDFInfo
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- CN116914262A CN116914262A CN202310378119.1A CN202310378119A CN116914262A CN 116914262 A CN116914262 A CN 116914262A CN 202310378119 A CN202310378119 A CN 202310378119A CN 116914262 A CN116914262 A CN 116914262A
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- zheng
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- 239000005486 organic electrolyte Substances 0.000 title claims abstract description 31
- 239000007772 electrode material Substances 0.000 title claims abstract description 17
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002904 solvent Substances 0.000 claims abstract description 26
- 159000000000 sodium salts Chemical class 0.000 claims abstract description 14
- 239000003960 organic solvent Substances 0.000 claims abstract description 13
- GKTNLYAAZKKMTQ-UHFFFAOYSA-N n-[bis(dimethylamino)phosphinimyl]-n-methylmethanamine Chemical compound CN(C)P(=N)(N(C)C)N(C)C GKTNLYAAZKKMTQ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003792 electrolyte Substances 0.000 claims description 25
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 claims description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 8
- 229910052708 sodium Inorganic materials 0.000 claims description 8
- 239000011734 sodium Substances 0.000 claims description 8
- -1 sodium hexafluorophosphate Chemical compound 0.000 claims description 8
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 6
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 5
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 claims description 4
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 claims description 4
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 4
- 150000005676 cyclic carbonates Chemical class 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 claims description 4
- LOZAIRWAADCOHQ-UHFFFAOYSA-N triphosphazene Chemical compound PNP=NP LOZAIRWAADCOHQ-UHFFFAOYSA-N 0.000 claims description 4
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 claims description 3
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 claims description 3
- IZZOKZMGQDMCAE-XQZFLANJSA-N alpha-L-Rhap-(1->2)-[beta-D-GlcpNAc-(1->3)]-alpha-L-Rhap-(1->3)-alpha-L-Rhap-(1->2)-[beta-D-GlcpNAc-(1->3)]-alpha-L-Rhap Chemical compound O[C@@H]1[C@H](O)[C@@H](O)[C@H](C)O[C@H]1O[C@@H]1[C@H](O[C@H]2[C@@H]([C@@H](O)[C@H](O)[C@@H](CO)O2)NC(C)=O)[C@@H](O)[C@H](C)O[C@H]1O[C@H]1[C@@H](O)[C@H](O[C@@H]2[C@@H]([C@@H](O)[C@H](C)O[C@H]2O)O[C@H]2[C@@H]([C@@H](O)[C@H](O)[C@@H](CO)O2)NC(C)=O)O[C@@H](C)[C@@H]1O IZZOKZMGQDMCAE-XQZFLANJSA-N 0.000 claims description 2
- 229930188620 butyrolactone Natural products 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 150000004292 cyclic ethers Chemical class 0.000 claims description 2
- BAZAXWOYCMUHIX-UHFFFAOYSA-M sodium perchlorate Chemical compound [Na+].[O-]Cl(=O)(=O)=O BAZAXWOYCMUHIX-UHFFFAOYSA-M 0.000 claims description 2
- 229910001488 sodium perchlorate Inorganic materials 0.000 claims description 2
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 claims description 2
- CNQBXJDCTHCEFG-UHFFFAOYSA-N 2,2,4,4,6,6-hexamethoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound COP1(OC)=NP(OC)(OC)=NP(OC)(OC)=N1 CNQBXJDCTHCEFG-UHFFFAOYSA-N 0.000 claims 1
- ISUWUSUXSDAFQL-UHFFFAOYSA-N FC(COP1N=PN=P[N]1)(F)F Chemical compound FC(COP1N=PN=P[N]1)(F)F ISUWUSUXSDAFQL-UHFFFAOYSA-N 0.000 claims 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 abstract description 20
- 229910001415 sodium ion Inorganic materials 0.000 abstract description 20
- 239000000463 material Substances 0.000 abstract description 3
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- 230000001351 cycling effect Effects 0.000 abstract 1
- 150000002148 esters Chemical class 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 239000013543 active substance Substances 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910021385 hard carbon Inorganic materials 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- ZQDZSGHAIZKNHJ-UHFFFAOYSA-N trisodium difluoro oxalate borate Chemical group [Na+].[Na+].[Na+].[O-]B([O-])[O-].FOC(=O)C(=O)OF ZQDZSGHAIZKNHJ-UHFFFAOYSA-N 0.000 description 2
- JJFDUEREVQNQCH-UHFFFAOYSA-N B([O-])([O-])[O-].[Na+].C(C(=O)F)(=O)F.[Na+].[Na+] Chemical compound B([O-])([O-])[O-].[Na+].C(C(=O)F)(=O)F.[Na+].[Na+] JJFDUEREVQNQCH-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 102000004310 Ion Channels Human genes 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000010416 ion conductor Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- FJPWIJZUVYYHQE-UHFFFAOYSA-N sodium dihydrogen borate oxalic acid Chemical compound B([O-])(O)O.C(C(=O)O)(=O)O.C(C(=O)O)(=O)O.[Na+] FJPWIJZUVYYHQE-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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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
- H01M10/0569—Liquid materials characterised by the solvents
-
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
-
- 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
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
-
- 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
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
- H01M2300/0028—Organic electrolyte characterised by the solvent
-
- 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)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses an organic electrolyte which can be matched with Prussian Bai Zheng polar materials and is resistant to high temperature, wherein the organic electrolyte consists of sodium salt and an organic solvent, and the components of the organic electrolyte comprise one or more organic solvents such as carbonic ester, phosphazene solvent, linear ether and the like with a cyclic structure. The organic electrolyte provided by the invention has the advantages of low viscosity, high ionic conductivity and relatively stable state maintained at 60 ℃, and the sodium ion battery assembled by the organic electrolyte and the Prussian Bai Zheng electrode material has good cycling stability at high temperature.
Description
Technical Field
The invention relates to the field of sodium ion batteries, in particular to a high-temperature organic electrolyte which can be applied to Prussian Bai Zheng pole materials.
Background
In recent years, the cost of lithium ion batteries is sharply increased due to the limited content of lithium elements, and sodium ion batteries gradually draw attention of researchers in all groups due to the advantages of abundant sodium reserves, low cost, wide working temperature range, environmental friendliness and the like. The Prussian Bai Zheng electrode material has a rigid lattice skeleton and a large ion channel, provides convenient conditions for sodium ion deintercalation, and has high theoretical specific capacity, so that the Prussian Bai Zheng electrode material becomes one of the most favored sodium ion anode materials for enterprises. However, prussian white crystals have poor cyclic stability in high temperature environments, and their development has been limited to some extent.
The electrolyte is used as a key component of the battery, can be used as an ion conductor between electrode materials of the battery, and is closely related to the capacity, the cycle life and the like of the battery. However, since sodium ion batteries are relatively imperfect, especially their development requires further exploration, the development of functional electrolytes adapted for individual electrode materials is also lacking. In addition, lithium salts and sodium salts have large differences in properties, resulting in lithium ion battery electrolytes that are not suitable for use in sodium ion batteries.
Therefore, in order to solve the above problems, development of an electrolyte that is compatible with the prussian Bai Zheng electrode material and that can be stably circulated at a high temperature of 60 ℃ would be a highly desirable problem.
Disclosure of Invention
The invention aims to provide a high-temperature organic electrolyte which is applicable to Prussian Bai Zheng pole materials and has the advantages of being capable of solving the problems that sodium-electricity electrolyte is easy to decompose at high temperature and Prussian white is poor in high-temperature stability.
The technical aim of the invention is realized by the following technical scheme:
the high-temperature organic electrolyte applicable to the Prussian Bai Zheng electrode material comprises electrolyte sodium salt and an organic solvent, wherein the organic solvent comprises one or more of a linear ether solvent, a cyclic carbonate solvent, a cyclic ether solvent, a chain ether solvent and a phosphazene solvent, and the electrolyte sodium salt comprises one or more of sodium difluorooxalate borate, sodium dioxalate borate, sodium hexafluorophosphate and sodium perchlorate.
Preferably, the chain ether solvent has a structural formula comprising one or more-CH 2 OCH 2 -structural units, the chain ether solvent having a number of carbon atoms in the range of 3-20, the chain ether solvent having a melting point in the range of-20 ℃ -150 ℃.
Preferably, the linear ether solvent comprises one or more of diethylene glycol dimethyl ether, ethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, diethyl ether and dimethyl ether.
Preferably, the phosphazene solvent contains at least one phosphazene group, the melting point of the phosphazene solvent is in the range of 0-150 ℃, and the phosphazene solvent comprises one or more of ethoxy pentafluoroethylene triphosphazene, hexafluoro-cyclophosphazene, hexamethoxy-ethoxyethoxy-cyclophosphazene, and hexa-2, 2-trifluoroethoxy-cyclophosphazene.
Preferably, the cyclic carbonate includes one or more of ethylene carbonate, propylene carbonate and butyrolactone.
Preferably, the electrolyte sodium salt is one or more of sodium difluorooxalato borate, sodium dioxaoxalato borate and sodium hexafluorophosphate.
Preferably, the molar concentration of the electrolyte sodium salt is 0.1-5M.
Preferably, the molar concentration of the electrolyte sodium salt is 0.8-2.5M.
The beneficial effects of the invention are as follows: after the organic electrolyte with a wide working temperature area is prepared by optimizing the proportion of solvent components, the viscosity of the whole electrolyte system can be greatly reduced, and the conductivity can be improved. The organic electrolyte provided by the invention can not be decomposed at a high temperature of 60 ℃, can still maintain high ionic conductivity, and greatly improves the cycle life and coulombic efficiency of a sodium ion battery which is composed of Prussian white as a positive electrode material at a high temperature.
Drawings
FIG. 1 is a graph showing the change of ionic conductivity with temperature of the organic electrolyte prepared in example 1;
FIG. 2 is a graph showing the viscosity of the organic electrolyte prepared in example 1 according to the temperature;
fig. 3 is a cycle performance diagram of the organic electrolyte-matched prussian white battery prepared in example 2 at high temperature and normal temperature;
fig. 4 is a charge-discharge curve of the organic electrolyte prepared in example 5 matched with the prussian white battery.
Detailed Description
The following description is only of the preferred embodiments of the present invention, and the scope of the present invention should not be limited to the examples, but should be construed as falling within the scope of the present invention. Wherein like parts are designated by like reference numerals.
Example 1
The embodiment provides a sodium ion battery electrolyte, which comprises the following specific steps:
1) And (3) preparing an electrolyte: preparing sodium ion battery electrolyte in a glove box filled with argon, wherein electrolyte salt is sodium difluoro oxalate borate, and the concentration is 0.8M; the organic solvent is ethylene glycol dimethyl ether, pentafluoroethylene triphosphazene and propylene carbonate (volume ratio is 1:2:3), and the organic solvent is stirred and mixed uniformly to obtain the organic electrolyte of the embodiment 1;
3) Test of electrolyte:
FIG. 1 is a graph showing the change of the ionic conductivity of the organic electrolyte prepared in example 1 with temperature, and it can be seen from FIG. 1 that the ionic conductivity of the organic electrolyte decreases with increasing temperature, and the ionic conductivity can reach 18.91ms cm < -1 > at 60 ℃.
Fig. 2 shows the viscosity of the organic electrolyte prepared in example 1 according to the temperature, and it can be seen from fig. 2 that the viscosity of the organic electrolyte gradually increases with the decrease in temperature. In general, the lower the viscosity, the more favorable the conduction of ions.
Example 2
The embodiment provides a sodium ion battery, which comprises the following specific steps:
1) Preparing a bare cell: weighing Na2-xFe [ Fe (CN) 6] Prussian white, acetylene black and PVDF according to the mass ratio of 85:5:10, adding N-methylpyrrolidone (NMP), grinding and mixing, coating on aluminum foil, drying, and stacking a hard carbon electrode, a diaphragm GF-D and a sodium sheet into a bare cell in an electrode shell at one time under high-purity argon;
2) And (3) preparing an electrolyte: preparing sodium ion battery electrolyte in a glove box filled with argon, wherein electrolyte salt is sodium difluoro oxalate borate, and the concentration is 0.8M; the organic solvent is ethylene glycol dimethyl ether, ethoxy pentafluoroethylene triphosphazene and propylene carbonate, and the organic solvent is evenly stirred and mixed to obtain organic electrolyte (volume ratio is 1:2:3);
3) Assembling the Prussian white battery: dropwise adding the organic electrolyte obtained in the step 2) into a bare cell under high-purity argon, and completely sealing a battery shell after the cell is fully soaked to obtain a sodium ion battery;
4) Cell electrochemical performance test: and carrying out charge and discharge test on the assembled sodium ion battery on a blue electric tester. The test voltage interval is 2-4.2V, and the battery capacity and the charge-discharge multiplying power are calculated according to the mass of active substance hard carbon. The battery was subjected to charge and discharge cycles at normal temperature and high temperature at a constant rate of 1C, respectively, and the test performance results are shown in tables 1 to 2.
Fig. 4 is a graph showing the cycle performance of the organic electrolyte-matched prussian white battery prepared in example 2, and it can be seen from fig. 4 that the organic electrolyte prepared in example 2 has relatively stable cycle performance at a temperature of 25 ℃ and a temperature of 60 ℃.
Example 3
This embodiment provides a sodium ion battery, and the difference between this embodiment and embodiment 2 is that: in the step 2), the organic solvent is diethylene glycol dimethyl ether; other parameters and steps were the same as in example 2. The sodium ion battery prepared in example 3 was subjected to charge and discharge test on a blue electric tester, the test voltage interval was 2-4.2V, and the battery capacity and the charge and discharge rate were both calculated by the mass of the active substance Prussian white. The battery was subjected to charge and discharge cycles at normal temperature and high temperature, respectively, with a constant rate of 1C, and the test performance results are shown in tables 1 to 2.
Example 4
This embodiment provides a sodium ion battery, and the difference between this embodiment and embodiment 2 is that:
in the step 2), the electrolyte salt is sodium hexafluorophosphate; other parameters and steps were the same as in example 2.
The sodium ion battery prepared in example 4 was subjected to charge and discharge test on a blue electric tester, the test voltage interval was 2-4.2V, and the battery capacity and the charge and discharge rate were both calculated by the mass of the active substance Prussian white. The battery was subjected to charge and discharge cycles at normal temperature and high temperature at a constant rate of 1C, respectively, and the test performance results are shown in tables 1 to 2.
Comparative example 1
The difference between this comparative example and example 2 is that:
in the step 2), the organic solvent is ethylene carbonate and dimethyl carbonate (volume ratio 1:1); the sodium salt was sodium hexafluorophosphate, and the other parameters and steps were the same as in example 2.
The sodium ion battery prepared in comparative example 1 was subjected to charge and discharge test on a blue electric tester, the test voltage interval was 2-4.2V, and the battery capacity and charge and discharge rate were both calculated by the mass of the active substance Prussian white. The battery was subjected to charge-discharge cycles at 1C and at high temperatures, and the test performance results are shown in tables 1-2.
Comparative example 2
The difference between this comparative example and example 2 is that:
in the step 2), the organic solvent is ethylene carbonate and propylene carbonate (volume ratio is 1:1); the sodium salt is sodium hexafluorophosphate
Other parameters and steps were the same as in example 2.
The sodium ion battery prepared in comparative example 2 was subjected to charge and discharge test on a blue electric tester, the test voltage interval was 2-4.2V, and the battery capacity and charge and discharge rate were both calculated by the mass of the active substance Prussian white. The charge and discharge cycles were carried out at 1C and at elevated temperature, and the test performance results are shown in tables 1-2.
Table 1 test of electrochemical Performance at Normal temperature for examples
Table 2 high temperature electrochemical performance test of various examples
The technical problems, technical solutions and advantageous effects solved by the present invention have been further described in detail in the above-described embodiments, and it should be understood that the above-described embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the scope of protection of the present invention.
Claims (8)
1. The high-temperature organic electrolyte applicable to the Prussian Bai Zheng electrode material comprises electrolyte sodium salt and an organic solvent, and is characterized in that the organic solvent comprises one or more of a linear ether solvent, a cyclic carbonate solvent, a cyclic ether solvent, a chain ether solvent and a phosphazene solvent, and the electrolyte sodium salt comprises one or more of sodium difluorooxalato borate, sodium dioxaato borate, sodium hexafluorophosphate and sodium perchlorate.
2. The high temperature organic electrolyte suitable for Prussian Bai Zheng electrode material according to claim 1, wherein the chain ether solvent has a structural formula comprising one or more-CH 2 OCH 2 -structural units, the chain ether solvent having a number of carbon atoms in the range of 3-20, the chain ether solvent having a melting point in the range of-20 ℃ -150 ℃.
3. The high-temperature organic electrolyte applicable to Prussian Bai Zheng electrode materials according to claim 1, wherein the linear ether solvent comprises one or more of diethylene glycol dimethyl ether, ethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, diethyl ether and dimethyl ether.
4. The high temperature organic electrolyte suitable for use in a Prussian Bai Zheng electrode material according to claim 1, wherein the phosphazene solvent comprises at least one phosphazene group, the melting point of the phosphazene solvent is in the range of 0 ℃ to 150 ℃, and the phosphazene solvent comprises one or more of ethoxy pentafluoroethylene triphosphazene, hexafluorocyclophosphazene, hexamethoxy cyclotriphosphazene, hexamethoxy ethoxy cyclotriphosphazene, and hexa-2, 2-trifluoroethoxy cyclotriphosphazene.
5. The high temperature organic electrolyte applicable to Prussian Bai Zheng electrode material according to claim 1, wherein the cyclic carbonate comprises one or more of ethylene carbonate, propylene carbonate and butyrolactone.
6. The high-temperature organic electrolyte applicable to Prussian Bai Zheng electrode materials according to claim 1, wherein the electrolyte sodium salt is one or more of sodium difluorooxalato borate, sodium dioxaoxalato borate and sodium hexafluorophosphate.
7. The high-temperature organic electrolyte applicable to Prussian Bai Zheng electrode materials according to claim 1, wherein the molar concentration of the electrolyte sodium salt is 0.1-5M.
8. The high temperature organic electrolyte solution applicable to Prussian Bai Zheng electrode material according to claim 7, wherein the molar concentration of the electrolyte sodium salt is 0.8-2.5M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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