CN116130882A - Sodium battery diaphragm and sodium battery - Google Patents
Sodium battery diaphragm and sodium battery Download PDFInfo
- Publication number
- CN116130882A CN116130882A CN202310038273.4A CN202310038273A CN116130882A CN 116130882 A CN116130882 A CN 116130882A CN 202310038273 A CN202310038273 A CN 202310038273A CN 116130882 A CN116130882 A CN 116130882A
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- CN
- China
- Prior art keywords
- sodium
- sodium battery
- diaphragm
- battery separator
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/426—Fluorocarbon polymers
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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
- H01M10/054—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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
- H01M50/457—Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a sodium battery diaphragm and a sodium battery, wherein the sodium battery diaphragm comprises: a separator substrate on which a coating film formed of a composite of tetraethyl orthosilicate and a perfluorosulfonic acid resin is coated; the sodium battery includes: a positive electrode, a negative electrode, an electrolyte solution and the sodium battery separator. The sodium battery diaphragm is formed by a coating film formed by a composite material of tetraethoxysilane and perfluorinated sulfonic acid resin on a diaphragm base material, and can improve the wettability of electrolyte, thereby promoting smooth migration of sodium ions and improving electrochemical characteristics; meanwhile, the sodium ion conductivity and the liquid absorption rate of the diaphragm can be improved, so that the diaphragm shows high battery capacity and cycle stability when being used for a sodium ion battery.
Description
Technical Field
The invention relates to the technical field of sodium batteries, in particular to a sodium battery diaphragm and a sodium battery.
Background
As consumer demand has changed due to digitization and high performance of electronic products, market demand has also changed due to the development of thin, light and high energy density high capacity batteries. In addition, in order to cope with future energy and environmental problems, development of hybrid vehicles, electric vehicles and fuel cell vehicles has been actively promoted, and an increase in the size of power supply batteries of vehicles has been demanded.
Currently, lithium ion batteries use a Polyethylene (PE) or polypropylene (PP) separator, however, when it is applied to a sodium ion battery, it is not wetted by an electrolyte solution, the liquid absorption and conductivity are poor, and it is difficult to achieve battery performance.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a sodium battery diaphragm and a sodium battery, which have excellent compatibility with electrolyte solution used in a sodium ion battery and excellent liquid absorption rate and conductivity.
The invention discloses a sodium battery diaphragm, which comprises: a separator substrate;
the membrane substrate is coated with a coating film formed by a composite material of tetraethoxysilane and perfluorinated sulfonic acid resin.
As a further improvement of the present invention, the separator substrate is a polyethylene substrate or a polypropylene substrate.
As a further improvement of the invention, the mass ratio of the tetraethoxysilane to the perfluorinated sulfonic acid resin is 1:1-2:1.
As a further improvement of the present invention, the preparation method of the sodium battery separator includes:
immersing the diaphragm substrate in a mixed solution of benzoyl peroxide and acetone for a preset time, taking out and drying;
and immersing the dried diaphragm substrate into a mixed solution of tetraethoxysilane and perfluorinated sulfonic acid resin, taking out, and performing heat treatment to obtain the sodium battery diaphragm.
As a further improvement of the invention, the immersion is carried out for 0.5 to 2 hours, and the drying temperature is 15 to 25 ℃.
As a further improvement of the invention, the heat treatment temperature is 80-100 ℃ and the heat treatment time is 0.5-1 h.
As a further improvement of the present invention, the wetting angle of the sodium battery separator is no greater than 50 °.
The invention also discloses a sodium battery, which comprises: a positive electrode, a negative electrode, an electrolyte solution and the sodium battery separator.
As a further improvement of the present invention, the electrolyte solution is composed of sodium perchlorate or sodium hexafluorophosphate added to a solvent in which propylene carbonate and ethylene carbonate are mixed.
Compared with the prior art, the invention has the beneficial effects that:
the sodium battery diaphragm is formed by a coating film formed by a composite material of tetraethoxysilane and perfluorinated sulfonic acid resin on a diaphragm base material, and can improve the wettability of electrolyte, thereby promoting smooth migration of sodium ions and improving electrochemical characteristics; meanwhile, the sodium ion conductivity and the liquid absorption rate of the diaphragm can be improved, so that the diaphragm shows high battery capacity and cycle stability when being used for a sodium ion battery.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention is described in further detail below:
the present invention provides a sodium battery separator comprising: a separator substrate on which a coating film formed of a composite of tetraethyl orthosilicate and a perfluorosulfonic acid resin is coated; wherein:
the membrane substrate is a polyethylene substrate or a polypropylene substrate;
the mass ratio of the ethyl orthosilicate to the perfluorinated sulfonic acid resin is 1:1-2:1.
The preparation method of the sodium battery separator comprises the following steps:
step 1, immersing a diaphragm substrate in a mixed solution of benzoyl peroxide and acetone for 0.5-2 h, taking out and drying at 15-25 ℃; among them, the immersion time is preferably 1 to 1.5 hours;
step 2, immersing the dried diaphragm substrate into a mixed solution of tetraethoxysilane and perfluorinated sulfonic acid resin, taking out, and performing heat treatment at 80-100 ℃ to obtain a sodium battery diaphragm; among them, the drying temperature is preferably 80 to 90 ℃.
The sodium battery diaphragm prepared by the invention has a pore structure so as to move sodium ions; the wetting angle of the sodium battery separator is not more than 50 deg., so that wettability is improved, and the discharge capacity of the sodium ion battery can be improved.
The present invention provides a sodium battery comprising: the positive electrode, the negative electrode, the electrolyte solution and the sodium battery separator, wherein the electrolyte solution is formed by adding sodium perchlorate or sodium hexafluorophosphate into a mixed solvent of propylene carbonate and ethylene carbonate, and the electrolyte solution has high dielectric constant and low viscosity, so that sodium salt can be well dissociated and the viscosity is low.
The invention has the advantages that:
the sodium battery diaphragm is formed by a coating film formed by a composite material of tetraethoxysilane and perfluorinated sulfonic acid resin on a diaphragm base material, and can improve the wettability of electrolyte, thereby promoting smooth migration of sodium ions and improving electrochemical characteristics; meanwhile, the sodium ion conductivity and the liquid absorption rate of the diaphragm can be improved, so that the diaphragm shows high battery capacity and cycle stability when being used for a sodium ion battery.
Example 1:
a sodium battery separator comprising: a PE substrate coated with a coating film formed of a composite of ethyl orthosilicate and a perfluorosulfonic acid resin; wherein the mass ratio of the ethyl orthosilicate to the perfluorinated sulfonic acid resin is 1:1.
A method of making a sodium battery separator comprising:
s1, immersing a PE substrate in a mixed solution of benzoyl peroxide and acetone for 1h, taking out and drying at 20 ℃;
s2, immersing the dried PE substrate into a mixed solution of tetraethoxysilane and perfluorinated sulfonic acid resin, taking out, and performing heat treatment at 90 ℃ to obtain the sodium battery diaphragm.
The sodium cell separator prepared in example 1 had a wet angle of 48.3 °, a discharge capacity of up to 150mAh/g and a cycle number of up to 650.
Example 2:
a sodium battery separator, differing from example 1, in that the mass ratio of tetraethyl orthosilicate to perfluorosulfonic acid resin was 2:1.
The sodium cell separator prepared in example 2 had a wet angle of 46.7 deg., a discharge capacity of up to 120mAh/g and a cycle number of 520.
Comparative example 1:
a sodium battery separator is a PE substrate.
The wetting angle of the sodium cell separator prepared in comparative example 1 was 78.3 °.
Comparative example 2:
a sodium battery separator, differing from example 1, in that the mass ratio of tetraethyl orthosilicate to perfluorosulfonic acid resin was 3:1.
The sodium battery separator prepared in comparative example 2 had a wet angle of 46.4 deg., a discharge capacity of up to 90mAh/g and a cycle number of 450.
Comparative example 3:
a sodium battery separator, differing from example 1, in that the mass ratio of tetraethyl orthosilicate to perfluorosulfonic acid resin was 1:2.
The sodium battery separator prepared in comparative example 3 had a wet angle of 54.7 deg., a discharge capacity of up to 155mAh/g and a cycle number of 655.
Conclusion:
the infiltration angle of the sodium battery diaphragm is lower than 50 degrees, the highest discharge capacity is higher than 100mAh/g, and the cycle number is higher than 500.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A sodium battery separator, comprising: a separator substrate;
the membrane substrate is coated with a coating film formed by a composite material of tetraethoxysilane and perfluorinated sulfonic acid resin.
2. The sodium battery separator of claim 1, wherein the separator substrate is a polyethylene substrate or a polypropylene substrate.
3. The sodium battery separator according to claim 1, wherein the mass ratio of the ethyl orthosilicate to the perfluorosulfonic acid resin is 1:1-2:1.
4. The sodium battery separator as defined in claim 1, wherein the method of preparing the sodium battery separator comprises:
immersing the diaphragm substrate in a mixed solution of benzoyl peroxide and acetone for a preset time, taking out and drying;
and immersing the dried diaphragm substrate into a mixed solution of tetraethoxysilane and perfluorinated sulfonic acid resin, taking out, and performing heat treatment to obtain the sodium battery diaphragm.
5. The sodium battery separator as claimed in claim 4, wherein the immersion is performed for a preset time of 0.5 to 2 hours and the drying temperature is 15 to 25 ℃.
6. The sodium battery separator as claimed in claim 4, wherein the heat treatment temperature is 80 to 100 ℃ and the heat treatment time is 0.5 to 1h.
7. The sodium battery separator as in claim 1, wherein the wetting angle of the sodium battery separator is no greater than 50 °.
8. A sodium battery, comprising: a positive electrode, a negative electrode, an electrolyte solution, and a sodium battery separator as defined in any one of claims 1 to 7.
9. The sodium battery of claim 1, wherein the electrolyte solution is comprised of sodium perchlorate or sodium hexafluorophosphate added to a solvent of propylene carbonate and ethylene carbonate mixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310038273.4A CN116130882A (en) | 2023-01-10 | 2023-01-10 | Sodium battery diaphragm and sodium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310038273.4A CN116130882A (en) | 2023-01-10 | 2023-01-10 | Sodium battery diaphragm and sodium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116130882A true CN116130882A (en) | 2023-05-16 |
Family
ID=86311292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310038273.4A Pending CN116130882A (en) | 2023-01-10 | 2023-01-10 | Sodium battery diaphragm and sodium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116130882A (en) |
-
2023
- 2023-01-10 CN CN202310038273.4A patent/CN116130882A/en active Pending
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