CN116470160A - Novel sulfate functional electrolyte for aqueous sodium ion battery and battery - Google Patents
Novel sulfate functional electrolyte for aqueous sodium ion battery and battery Download PDFInfo
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- CN116470160A CN116470160A CN202310492124.5A CN202310492124A CN116470160A CN 116470160 A CN116470160 A CN 116470160A CN 202310492124 A CN202310492124 A CN 202310492124A CN 116470160 A CN116470160 A CN 116470160A
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- electrolyte
- additive
- ion battery
- sodium ion
- aqueous sodium
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 91
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910001415 sodium ion Inorganic materials 0.000 title claims abstract description 50
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 title claims abstract description 29
- 239000000654 additive Substances 0.000 claims abstract description 64
- 230000000996 additive effect Effects 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 7
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 7
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 7
- 239000007773 negative electrode material Substances 0.000 claims description 21
- 239000011734 sodium Substances 0.000 claims description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 12
- 239000010936 titanium Substances 0.000 claims description 12
- 229910052719 titanium Inorganic materials 0.000 claims description 12
- 229920000447 polyanionic polymer Polymers 0.000 claims description 11
- 239000011572 manganese Substances 0.000 claims description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- DCYOBGZUOMKFPA-UHFFFAOYSA-N iron(2+);iron(3+);octadecacyanide Chemical class [Fe+2].[Fe+2].[Fe+2].[Fe+3].[Fe+3].[Fe+3].[Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] DCYOBGZUOMKFPA-UHFFFAOYSA-N 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 5
- 239000007774 positive electrode material Substances 0.000 claims description 5
- 239000010405 anode material Substances 0.000 abstract description 8
- 230000001351 cycling effect Effects 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 9
- 239000007772 electrode material Substances 0.000 description 8
- 238000004090 dissolution Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000011056 performance test Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000010406 cathode material Substances 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000009831 deintercalation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- -1 hydroxyl ions Chemical class 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 3
- 229960001763 zinc sulfate Drugs 0.000 description 3
- 229910000368 zinc sulfate Inorganic materials 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000012983 electrochemical energy storage Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- 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
- H01M10/36—Accumulators not provided for in groups H01M10/05-H01M10/34
-
- 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
- H01M2300/0002—Aqueous electrolytes
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a novel sulfate functional electrolyte for a water-based sodium ion battery and a battery, and relates to the technical field of water-based sodium ion battery electrolytes, in particular to the novel sulfate functional electrolyte for the water-based sodium ion battery, which comprises sodium sulfate, an additive and water, wherein the additive is ZnSO 4 Additives and/or H 3 PO 4 An additive. Wherein ZnSO 4 Additives and H 3 PO 4 Additive and ZnSO 4 And H 3 PO 4 The addition of the composite additive is favorable for improving NaTi 2 (PO 4 ) 3 The structural stability and electrochemical performance of the/C anode material in the sulfate aqueous electrolyte are improved, so that the cycling stability of the aqueous sodium ion battery is enhanced, the cost is low, and the operation is simple.
Description
Technical Field
The invention relates to the technical field of aqueous sodium ion battery electrolyte, in particular to novel sulfate functional electrolyte for an aqueous sodium ion battery and a battery.
Background
The water system sodium ion battery is a novel electrochemical energy storage technology based on sodium ion deintercalation reaction and water system electrolyte, has the characteristics of low cost, safety, reliability, high energy conversion efficiency, easy maintenance and the like, and has a very high application prospect in the field of renewable energy source scale energy storage. An ideal aqueous sodium ion battery should have high specific energy and high charge and discharge rateThe rate is high, the service life is long, and the like, and the characteristics are mainly determined by the electrochemical activity and the structural stability of the electrode material. Currently available cathode materials mainly include manganese-based tunnel oxides, nickel-based polyanion compounds, and iron-based prussian blue analogues. Wherein, manganese-based tunnel oxide Na 0.44 MnO 2 And nickel-based Prussian blue analog Na 2 NiFe(CN) 6 The typical positive electrode material can be stably cycled more than 1000 times. However, the negative electrode materials that can be used in aqueous sodium ion batteries are very limited. Titanium-based polyanionic compounds (NaTi) 2 (PO 4 ) 3 ) The cathode material has the advantages of large theoretical specific capacity, low working potential, rapid ion diffusion and the like, and is the water-based sodium-ion battery cathode material which is most concerned at present. However, it is used in conventional aqueous electrolytes (e.g., 1MNA 2 SO 4 ) The medium structure is unstable and is easy to dissolve, so that the aqueous sodium ion battery based on the titanium-based polyanion type negative electrode material shows insufficient cycling stability. Therefore, improving the structural stability and electrochemical performance of the titanium-based polyanion anode material in the aqueous electrolyte is a key for enhancing the cycle stability of the aqueous sodium ion battery.
At present, main strategies for improving the structural stability and electrochemical performance of titanium-based polyanion anode materials in aqueous electrolyte are cation doping, surface coating and use of high-concentration electrolyte. Studies have shown that doping with inactive cations (Mg 2+ ，Mn 2+ Etc.) is favorable for improving the corrosion resistance of the material in the water-based electrolyte and inhibiting the side reaction of the electrolyte, but doping inactive cations can reduce the reversible capacity (60 mAhg) of the material -1 ). The surface coating can reduce the direct contact between the active material and the aqueous electrolyte, inhibit the dissolution of the material in the aqueous electrolyte, and improve the structural stability and charge-discharge performance of the material, but the intercalation/deintercalation reaction of the material is mainly carried out at low potential and is usually accompanied by the reduction hydrogen evolution reaction of the electrolyte, and the charge-discharge coulomb efficiency is lower (about 90%), and more serious, the hydrogen evolution side reaction promotes the alkalinity of the electrolyte, thereby accelerating the chemical dissolution and electrochemical performance degradation of the material. Thus, surface coatedNaTi 2 (PO 4 ) 3 the/C typically exhibits significant capacity fade after 100 cycles at low rate. The use of high-concentration electrolyte can reduce the chemical/electrochemical activity of electrolyte solvent molecules, which is beneficial to widening the electrochemical stability window of the electrolyte and constructing a stable electrode/electrolyte interface so as to strengthen NaTi 2 (PO 4 ) 3 Structural stability and electrochemical performance of/C, however, the use of high concentrations of electrolyte greatly increases the manufacturing cost of the cell. Therefore, the development and design are beneficial to improving NaTi 2 (PO 4 ) 3 A novel low-cost aqueous electrolyte with structural stability and electrochemical performance of the negative electrode material is necessary.
Disclosure of Invention
The invention solves the problems that the titanium-based polyanion type negative electrode material has unstable structure in an aqueous electrolyte and is easy to dissolve, so that the aqueous sodium-ion battery based on the titanium-based polyanion type negative electrode material has insufficient cycling stability.
In order to solve the problems, the invention provides a novel sulfate functional electrolyte for an aqueous sodium ion battery, which comprises sodium sulfate, an additive and water, wherein the additive is ZnSO 4 Additives and/or H 3 PO 4 An additive.
Further, the concentration of the sodium sulfate in the electrolyte is 1.0mol/L.
Further, the additive is ZnSO 4 When added, the ZnSO 4 The concentration of the additive in the electrolyte is 0mol/L to 1.0mol/L.
Further, the additive is H 3 PO 4 When added, the H 3 PO 4 The concentration of the additive in the electrolyte is 0mol/L to 0.02mol/L.
Further, the additive is ZnSO 4 Additives and H 3 PO 4 When added, the ZnSO 4 Additives and said H 3 PO 4 The concentration ratio of the additive in the electrolyte is 50:1.
further, the pH value of the electrolyte is 3.6-6.0.
In order to solve the problems, the invention provides a water-based sodium ion battery, which comprises a positive electrode, a negative electrode and an electrolyte, wherein the electrolyte is the novel sulfate functional electrolyte for the water-based sodium ion battery.
Further, the negative electrode material is titanium-based polyanion compound NaTi 2 (PO 4 ) 3 。
Further, the positive electrode material is manganese-based tunnel oxide Na 0.44 MnO 2 Or nickel-based Prussian blue analogues Na 2 NiFe(CN) 6 。
In order to solve the problems, the invention also provides the novel sulfate functional electrolyte for the water-based sodium ion battery, and the application of the novel sulfate functional electrolyte in improving the stability of the water-based sodium ion battery.
Compared with the prior art, the novel sulfate functional electrolyte for the water-based sodium ion battery and the water-based sodium ion battery have the advantages that ZnSO is added into the water-based sodium ion electrolyte 4 Additives and/or H 3 PO 4 Additives, wherein ZnSO 4 The addition of the additive can capture hydroxyl ions generated on the surface of the electrode material and generate a indissolvable basic zinc sulfate interface protective layer in situ, thereby improving NaTi 2 (PO 4 ) 3 Structural stability and electrochemical performance of the negative electrode material; h 3 PO 4 The addition of the additive can inhibit NaTi by the principle of dissolution equilibrium 2 (PO 4 ) 3 The dissolution of the negative electrode material/C can also regulate and control the pH value of the electrolyte, inhibit the local alkalinity trend of the surface of the electrode material, thereby improving the structural stability and electrochemical performance of the NaTi2 (PO 4) 3/C negative electrode material; by introducing ZnSO 4 And H 3 PO 4 Composite additive for synergistically improving NaTi 2 (PO 4 ) 3 The structural stability and electrochemical performance of the/C anode material in the sulfate aqueous electrolyte are improved, so that the cycling stability of the aqueous sodium ion battery is enhanced, the cost is low, and the operation is simple.
Drawings
FIG. 1 shows the ZnSO content in example 1 of the invention 4 An electrochemical performance test chart of electrolyte of the additive;
FIG. 2 shows the addition and non-addition of ZnSO in example 1 of the invention 4 An electrochemical performance test chart of electrolyte of the additive;
FIG. 3 shows the content of H in example 2 of the present invention 3 PO 4 Electrochemical performance test chart one of electrolyte of additive;
FIG. 4 shows the content of H in example 2 of the present invention 3 PO 4 Second graph of electrochemical performance test of electrolyte of additive;
FIG. 5 is a graph showing electrochemical performance test of electrolytes with different additives in example 3 of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
The embodiment of the invention relates to a novel sulfate functional electrolyte for a water system sodium ion battery, which comprises sodium sulfate, an additive and water, wherein the additive is ZnSO 4 Additives and/or H 3 PO 4 An additive.
The embodiment of the invention adds ZnSO into the novel sulfate functional electrolyte for the water-based sodium ion battery 4 Additives and/or H 3 PO 4 Additives, wherein ZnSO 4 The addition of the additive can capture hydroxyl ions generated on the surface of the electrode material and generate a indissolvable basic zinc sulfate interface protective layer in situ, thereby improving NaTi 2 (PO 4 ) 3 Structural stability and electrochemical performance of the negative electrode material; h 3 PO 4 The addition of the additive can inhibit NaTi by the principle of dissolution equilibrium 2 (PO 4 ) 3 The dissolution of the/C anode material can also regulate and control the pH value of the electrolyte, inhibit the local alkalinity trend of the surface of the electrode material, thereby improving the NaTi 2 (PO 4 ) 3 Structural stability and electrochemical performance of the negative electrode material; by introduction ofZnSO 4 And H 3 PO 4 Composite additive for synergistically improving NaTi 2 (PO 4 ) 3 The structural stability and electrochemical performance of the/C anode material in the sulfate aqueous electrolyte are improved, so that the cycling stability of the aqueous sodium ion battery is enhanced, the cost is low, and the operation is simple.
In some specific embodiments, the concentration of the sodium sulfate in the electrolyte is 1.0mol/L. Thus, the sulfate material is readily available and low cost.
In some specific embodiments, the additive is ZnSO 4 When added, the ZnSO 4 The concentration of the additive in the electrolyte is 0mol/L to 1.0mol/L. Therefore, the method is more favorable for capturing hydroxyl ions generated on the surface of the electrode material and generating a indissolvable basic zinc sulfate interface protective layer in situ.
In some specific embodiments, the additive is H 3 PO 4 When added, the H 3 PO 4 The concentration of the additive in the electrolyte is 0mol/L to 0.02mol/L. Thereby, naTi is more effectively inhibited 2 (PO 4 ) 3 And (3) dissolving the negative electrode material, regulating and controlling the pH value of the electrolyte, and inhibiting the local alkalinity trend of the surface of the electrode material.
In some specific embodiments, the additive is ZnSO 4 Additives and H 3 PO 4 When added, the ZnSO 4 Additives and said H 3 PO 4 The concentration ratio of the additive in the electrolyte is 50:1. thereby, it is beneficial to synergistically improve NaTi 2 (PO 4 ) 3 The structural stability and electrochemical performance of the/C anode material in the sulfate aqueous electrolyte are improved, so that the cycling stability of the aqueous sodium ion battery is enhanced.
In some specific embodiments, the electrolyte has a pH of 3.6 to 6.0. Thereby, the NaTi is beneficial to be improved by controlling the pH value of the electrolyte 2 (PO 4 ) 3 Structural stability and electrochemical properties of the negative electrode material.
In order to solve the problems, the invention provides a water-based sodium ion battery, which comprises a positive electrode, a negative electrode and an electrolyte, wherein the electrolyte is the novel sulfate functional electrolyte for the water-based sodium ion battery.
In some specific embodiments, the negative electrode material is a titanium-based polyanionic compound, naTi 2 (PO 4 ) 3 。
In some specific embodiments, the positive electrode material is manganese-based tunnel oxide Na 0.44 MnO 2 Or nickel-based Prussian blue analogues Na 2 NiFe(CN) 6 。
The aqueous sodium ion battery is a novel electrochemical energy storage technology based on sodium ion deintercalation reaction and aqueous electrolyte, and has the characteristics of large specific energy, high charge and discharge rate, long service life and the like, and the characteristics are mainly determined by the electrochemical activity and structural stability of an electrode material. At present, manganese-based tunnel oxide Na 0.44 MnO 2 And nickel-based Prussian blue analog Na 2 NiFe(CN) 6 The typical positive electrode material can be stably cycled more than 1000 times. However, titanium-based polyanion compound (NaTi) which is a negative electrode material for aqueous sodium ion batteries 2 (PO 4 ) 3 ) In the traditional aqueous electrolyte, the structure is unstable and is easy to dissolve, so that the aqueous sodium ion battery based on the titanium-based polyanion negative electrode material shows insufficient cycling stability. Therefore, the improvement of the structural stability and the electrochemical performance of the titanium-based polyanion negative electrode material in the aqueous electrolyte by the novel sulfate functional electrolyte containing the additive is a key for enhancing the cycle stability of the aqueous sodium ion battery.
The embodiment of the invention also provides a novel sulfate functional electrolyte for the water-based sodium ion battery, and application of the novel sulfate functional electrolyte in improving stability of the water-based sodium ion battery. Specific advantages are detailed above and are not described here again.
Example 1
The embodiment of the invention is to prepare a series of preparations containing ZnSO 4 Na of additive 2 SO 4 Aqueous electrolyte, specifically 1MNA 2 SO 4 +xMZnSO 4 Wherein x= 0,0.2,0.4,0.5,0.6,0.8,1.0;NaTi is respectively tested by constant current charge and discharge technology 2 (PO 4 ) 3 Electrochemical performance of the/C anode material in each electrolyte, test current was 100 mA.g -1 . Experimental results indicate that when ZnSO 4 At an additive content of 0.5M, the material exhibits optimal electrochemical performance, as shown in fig. 1.
Example 2
The embodiment of the invention is a preparation series containing H 3 PO 4 Na of additive 2 SO 4 Aqueous electrolyte, specifically 1MNA 2 SO 4 +xMH 3 PO 4 Regulating and controlling the pH value of the electrolyte; naTi is respectively tested by constant current charge and discharge technology 2 (PO 4 ) 3 Electrochemical performance of the negative electrode material/C in electrolytes with different pH values, and test current of 100 mA.g -1 . The experimental results show that the material exhibits excellent electrochemical properties at a pH of 4.0 to 5.0, as shown in fig. 2.
Example 3
The embodiment of the invention is to prepare a series of preparations containing ZnSO 4 Additives and H 3 PO 4 Na of additive 2 SO 4 Aqueous electrolyte, specifically 1MNA 2 SO 4 +0.5MZnSO 4 +H 3 PO 4 The pH value of the multi-component electrolyte is adjusted to be between 4.0 and 5.0; comparison test of NaTi by constant current charge and discharge technology 2 (PO 4 ) 3 The negative electrode material/C is 1Mna 2 SO 4 +0.5MZnSO 4 +H 3 PO 4 、1MNa 2 SO 4 +0.5MZnSO 4 And Na (Na) 2 SO 4 The electrochemical performance of the test current is 100 mA.g -1 . Experimental results indicate that 1MNA 2 SO 4 +0.5MZnSO 4 +H 3 PO 4 The electrolyte can obviously improve the NaTi 2 (PO 4 ) 3 Electrolyte of structural stability and electrochemical performance of the negative electrode material is shown in fig. 3.
Although the present disclosure is disclosed above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the disclosure.
Claims (10)
1. The novel sulfate functional electrolyte for the water-based sodium ion battery is characterized by comprising sodium sulfate, an additive and water, wherein the additive is ZnSO 4 Additives and/or H 3 PO 4 An additive.
2. The novel sulfate functional electrolyte for an aqueous sodium ion battery of claim 1, wherein the concentration of sodium sulfate in the electrolyte is 1.0mol/L.
3. The novel sulfate functional electrolyte for aqueous sodium ion battery of claim 1, wherein the additive is ZnSO 4 When added, the ZnSO 4 The concentration of the additive in the electrolyte is 0mol/L to 1.0mol/L.
4. The novel sulfate functional electrolyte for aqueous sodium ion battery of claim 1, wherein the additive is H 3 PO 4 When added, the H 3 PO 4 The concentration of the additive in the electrolyte is 0mol/L to 0.02mol/L.
5. The novel sulfate functional electrolyte for aqueous sodium ion battery of claim 1, wherein the additive is ZnSO 4 Additives and H 3 PO 4 When added, the ZnSO 4 Additives and said H 3 PO 4 The concentration ratio of the additive in the electrolyte is 50:1.
6. the novel sulfate functional electrolyte for aqueous sodium ion battery of claim 4 or 5, wherein the pH of the electrolyte is 3.6-6.0.
7. An aqueous sodium ion battery, comprising a positive electrode, a negative electrode and an electrolyte, wherein the electrolyte is the novel sulfate functional electrolyte for the aqueous sodium ion battery according to any one of claims 1 to 5.
8. The aqueous sodium ion battery of claim 7 wherein the negative electrode material is a titanium-based polyanion compound, niti 2 (PO 4 ) 3 。
9. The aqueous sodium ion battery of claim 7 wherein the positive electrode material is manganese-based tunnel oxide Na 0.44 MnO 2 Or nickel-based Prussian blue analogues Na 2 NiFe(CN) 6 。
10. The novel sulfate functional electrolyte for aqueous sodium-ion batteries according to any one of claims 1 to 5, characterized by its use for improving the stability of aqueous sodium-ion batteries.
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| CN202310492124.5A CN116470160A (en) | 2023-05-05 | 2023-05-05 | Novel sulfate functional electrolyte for aqueous sodium ion battery and battery |
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