CN119663205A - Al-Mg alloy negative electrode current collector, preparation method thereof and negative electrode-free sodium metal battery - Google Patents
Al-Mg alloy negative electrode current collector, preparation method thereof and negative electrode-free sodium metal battery Download PDFInfo
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- CN119663205A CN119663205A CN202411792160.4A CN202411792160A CN119663205A CN 119663205 A CN119663205 A CN 119663205A CN 202411792160 A CN202411792160 A CN 202411792160A CN 119663205 A CN119663205 A CN 119663205A
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Abstract
The application provides an Al-Mg alloy negative electrode current collector, a preparation method thereof and a negative electrode-free sodium metal battery, and relates to the field of batteries. The preparation method of the Al-Mg alloy negative electrode current collector comprises the steps of sputtering magnesium on the surface of an aluminum foil in a magnetron sputtering mode to form a magnesium coating on the aluminum foil, and calcining the aluminum foil with the magnesium coating to obtain the Al-Mg alloy negative electrode current collector, wherein the Al-Mg alloy negative electrode current collector comprises an aluminum substrate layer and an Al-Mg alloy layer positioned on the aluminum substrate layer. According to the application, the Al-Mg alloy with high sodium affinity and stable three-dimensional structure is introduced into the negative current collector, so that uniform deposition of sodium can be induced, growth of sodium dendrite is inhibited, loss of active sodium is reduced, and cycle life of the battery is prolonged. The negative electrode current collector can be used in a negative electrode-free sodium metal battery. Moreover, the application has the advantages of simple operation and low cost of raw materials, and is favorable for large-scale popularization and application.
Description
Technical Field
The application relates to the field of batteries, in particular to an Al-Mg alloy negative electrode current collector, a preparation method thereof and a negative electrode-free sodium metal battery.
Background
Lithium ion batteries have become an indispensable energy storage device in the fields of electric automobiles, portable electronic devices, and the like, due to their advantages of high operating voltage, excellent rate performance, long cycle life, no memory effect, and the like. However, as global lithium resources are unevenly distributed and prices continue to rise, the application of lithium ion batteries in the field of large-scale energy storage is severely restricted. In this context, sodium ion batteries have received extensive attention and research as a powerful complement to lithium ion batteries at their low cost and good cycling stability.
Although sodium ion batteries are excellent in cost effectiveness and cycle stability, conventional sodium ion battery anode materials have difficulty in meeting the urgent demands for high energy density of next-generation energy storage systems due to their lower theoretical energy density. Therefore, sodium-metal batteries directly employing sodium metal as a negative electrode have been developed, which are considered as one of ideal candidates for next-generation energy storage devices by virtue of high energy density, low reduction potential, and low cost.
However, sodium metal anodes present challenges in practical applications. Sodium metal has high reactivity, and is easy to react with electrolyte to form an unstable Solid Electrolyte Interface (SEI) film. Such an unstable SEI film may not only cause non-uniform deposition of sodium and formation of dendrites, but also exacerbate rupture of the SEI film and consumption of electrolyte, thereby reducing coulombic efficiency of the battery. More seriously, the continuous growth of sodium dendrites may cause potential safety hazards such as volume expansion, short circuit, and even fire of the battery.
To cope with these challenges, scientific researchers have made extensive modification studies on sodium metal anodes in recent years with the aim of improving their stability and safety. These modification methods include modification with solid state electrolytes, construction of artificial interfacial films, and current collectors. The sodium metal negative current collector can effectively reduce local current density, induce uniform deposition of sodium, improve deposition/stripping efficiency of sodium metal, and is hopeful to realize a negative-electrode-free sodium metal battery.
In a non-negative sodium metal battery, the positive electrode material provides the sole active sodium source, while the negative electrode directly uses a bare current collector without prior deposition of sodium metal on the current collector. In the first charging process, sodium ions are extracted from the positive electrode material and deposited on the negative electrode current collector to form a 'real sodium metal negative electrode'. During the subsequent discharge of the battery, the active sodium on the negative current collector is re-intercalated into the positive electrode material, thereby achieving a charge-discharge cycle.
Aluminum is a metal that does not react with sodium to form an alloy and has a significant advantage in cost, and is thus considered to be one of the excellent sodium metal negative electrode current collectors. However, the commercial aluminum foil surface has a problem of local current density maldistribution, which easily results in the growth of sodium dendrites and degradation of battery performance.
Disclosure of Invention
The application aims to provide an Al-Mg alloy negative electrode current collector, a preparation method thereof and a negative electrode-free sodium metal battery so as to solve the problems.
In order to achieve the above purpose, the application adopts the following technical scheme:
A preparation method of an Al-Mg alloy negative electrode current collector comprises the following steps:
Sputtering magnesium on the surface of an aluminum foil in a magnetron sputtering mode to form a magnesium plating layer on the aluminum foil;
And calcining the aluminum foil with the magnesium coating to obtain the Al-Mg alloy negative current collector, wherein the Al-Mg alloy negative current collector comprises an aluminum substrate layer and an Al-Mg alloy layer positioned on the aluminum substrate layer.
According to an embodiment of the application, the thickness of the aluminum foil is 8-50 μm;
And/or the target base distance of the magnetron sputtering is 50-70mm.
According to the embodiment of the application, the vacuum degree of the magnetron sputtering is 1x 10 -2-1.5x 10-2 Pa.
According to the embodiment of the application, the power of the magnetron sputtered Mg target is 50-100W.
According to the embodiment of the application, the working pressure of the magnetron sputtering is 1-3Pa.
According to the embodiment of the application, the sputtering time of the magnetron sputtering is 5-12min.
According to an embodiment of the application, the calcination is performed in an argon atmosphere, and the temperature rise rate of the calcination is 2-8 ℃ per minute.
According to an embodiment of the application, the calcination temperature is 600-650 ℃;
And/or the calcination time is 5-8h.
The application also provides an Al-Mg alloy negative electrode current collector, which is prepared by the preparation method.
The application also provides a negative-electrode-free sodium metal battery, which comprises the Al-Mg alloy negative electrode current collector prepared by the preparation method or the Al-Mg alloy negative electrode current collector.
Compared with the prior art, the application has the beneficial effects that:
According to the application, the Al-Mg alloy with high sodium affinity and stable three-dimensional structure is introduced into the negative current collector, so that uniform deposition of sodium can be induced, growth of sodium dendrite is inhibited, loss of active sodium is reduced, and cycle life of the battery is prolonged. The negative electrode current collector can be used in a negative electrode-free sodium metal battery. Moreover, the application has the advantages of simple operation and low cost of raw materials, and is favorable for large-scale popularization and application.
Specifically, the application can grow a layer of Al-Mg alloy with a three-dimensional structure on the surface of the aluminum substrate layer to serve as a negative electrode current collector. The aluminum substrate has excellent conductivity, can rapidly collect current generated by the electrode, and can efficiently transfer the current. Mg in the Al-Mg alloy is used as a sodium-philic seed crystal, so that nucleation overpotential can be reduced, uniform deposition of sodium can be induced, and the coulombic efficiency and the cycling stability of the battery can be improved. In addition, the Al-Mg alloy with the three-dimensional structure can effectively increase the specific surface area of the current collector, reduce the local current density and the sodium ion flux, increase active nucleation sites, reduce dendrite deposition and further improve the cycle life of the battery.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope of the present application.
FIG. 1 is a scanning electron microscope image of an Al-Mg alloy anode current collector prepared in example 1.
Detailed Description
The term as used herein:
"by. Preparation method synonymous with" comprising ". The terms "comprising," "including," "having," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, step, method, article, or apparatus.
The term "consisting of" excludes any unspecified element, step or component. If used in a claim, such phrase will cause the claim to be closed, such that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a sentence of the claim body rather than immediately after the subject, it is limited to only the elements described in that sentence, and other elements are not excluded from the claim as a whole.
When an equivalent, concentration, or other value or parameter is expressed as a range, preferred range, or a range bounded by a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges of "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a numerical range is described herein, unless otherwise indicated, the range is intended to include its endpoints and all integers and fractions within the range.
In these examples, the parts and percentages are by mass unless otherwise indicated.
"Parts by mass" means a basic unit of measurement showing the mass ratio of a plurality of components, and 1 part may be any unit mass, for example, 1g, 2.689g, or the like. If we say that the mass part of the A component is a part and the mass part of the B component is B part, the ratio a: B of the mass of the A component to the mass of the B component is expressed. Or the mass of the A component is aK, the mass of the B component is bK (K is any number and represents a multiple factor). It is not misunderstood that the sum of the parts by mass of all the components is not limited to 100 parts, unlike the parts by mass.
"And/or" is used to indicate that one or both of the illustrated cases may occur, e.g., a and/or B include (a and B) and (a or B).
In order to better explain the technical scheme provided by the application, before the embodiment, the technical scheme is integrally stated, and the technical scheme is specifically as follows:
A preparation method of an Al-Mg alloy negative electrode current collector comprises the following steps:
Sputtering magnesium on the surface of an aluminum foil in a magnetron sputtering mode to form a magnesium plating layer on the aluminum foil;
And calcining the aluminum foil with the magnesium coating to obtain the Al-Mg alloy negative current collector, wherein the Al-Mg alloy negative current collector comprises an aluminum substrate layer and an Al-Mg alloy layer positioned on the aluminum substrate layer.
The Al-Mg alloy has high sodium affinity and stable three-dimensional structure, can induce uniform deposition/stripping of sodium, inhibit growth of sodium dendrite and prolong the cycle life of the battery. In addition, the substrate and the Al-Mg alloy interface are mutually fused, so that the interface stability of the aluminum substrate and the Al-Mg alloy can be improved, and the service life of the negative electrode current collector can be prolonged. The Al-Mg alloy negative electrode current collector prepared by the application can be used in a negative electrode-free sodium metal battery.
According to some embodiments of the application, the method further comprises pre-treating the aluminum foil prior to sputtering magnesium onto the surface of the aluminum foil. The pretreatment of the aluminum foil comprises three times of ultrasonic cleaning by adopting deionized water, acetone and absolute ethyl alcohol alternately. Then, the aluminum foil is dried by infrared drying or vacuum drying. Impurities and oil stains on the surface of the aluminum foil can be removed by pretreatment of the aluminum foil, and the problems that the adhesion between a magnesium plating layer and the surface of the aluminum foil is unstable and the aluminum foil falls off are avoided.
According to an embodiment of the application, the thickness of the aluminum foil is 8-50 μm;
for example, the thickness of the aluminum foil may be 8 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, or any value between 8-50 μm.
And/or the target base distance of the magnetron sputtering is 50-70mm. When the target base distance is within the above range, the sputtered magnesium particles can maintain proper kinetic energy, not only can be effectively diffused on the aluminum foil, but also can ensure the close arrangement among the particles, thereby generating a high-quality magnesium plating layer. If the target base distance is too large, the sputtered magnesium particles can reach the surface of the aluminum foil substrate with smaller kinetic energy, and the diffusion of the particles in the substrate is not facilitated. If the target base distance is too small, the sputtered particles have too large kinetic energy, are easy to migrate and diffuse on the substrate, are unfavorable for forming a compact film, and can impact the film by the too high kinetic energy, so that the deposition thickness is uneven.
For example, the target base distance for magnetron sputtering may be 50mm, 55mm, 60mm, 65mm, 70mm, or any value between 50-70 mm.
According to the embodiment of the application, the vacuum degree of the magnetron sputtering is 1x 10 -2-1.5x 10-2 Pa.
For example, the vacuum degree of magnetron sputtering may be 1x 10-2Pa、1.1x 10-2Pa、1.2x 10-2Pa、1.3x 10- 2Pa、1.4x 10-2Pa、1.5x 10-2Pa or any value between 1×10 -2-1.5x 10-2 Pa.
According to the embodiment of the application, the power of the magnetron sputtered Mg target is 50-100W. When the Mg target power is within the above range, the Mg target can stably generate a glow discharge, ensure the continuity and stability of the sputtering process, while maintaining a suitable sputtering rate, and is advantageous for forming a uniform and dense magnesium plating layer on an aluminum foil. If the Mg target power is too low, the glow discharge is difficult to maintain, and the film formation rate is slow. If the Mg target power is too high, the sputtering rate increases sharply, which can cause the sputtered particles to condense more nuclei on the substrate, and the nucleation is uneven, thereby affecting the quality and performance of the magnesium coating.
For example, the Mg target power of magnetron sputtering may be 50W, 55W, 60W, 65W, 70W, 75W, 80W, 85W, 90W, 95W, 100W, or any value between 50-100W.
According to the embodiment of the application, the working pressure of the magnetron sputtering is 1-3Pa. When the working pressure is within the range, a proper amount of gas atoms can be ionized, so that a stable sputtering process is maintained, the moderate deposition rate can be ensured, and the uniform and compact magnesium coating can be formed. The working pressure has an influence on the sputtering rate, and when the working pressure is too low, the number of ionized gas atoms is small, so that the deposition rate is low. The working pressure is high, the deposition rate is high, however, if the working pressure is too high, sputtered target atoms are scattered too much in the process of flying to the substrate, so that the deposition rate is reduced.
For example, the operating pressure of magnetron sputtering may be any value between 1Pa, 2Pa, 3Pa, or 1-3 Pa.
According to the embodiment of the application, the sputtering time of the magnetron sputtering is 5-12min. When the sputtering time is within the above range, the sputtering process can be sufficiently performed, the thickness and the density of the magnesium plating layer can be ensured, and the magnesium plating layer with uniform and smooth surface can be obtained. If the sputtering time is too short, the quality of the film is degraded, and if the sputtering time is too long, the uniformity of the film is affected.
For example, the sputtering time of the magnetron sputtering may be 5min, 6min, 7min, 8min, 9min, 10min, 11min, 12min, or any value between 5-12 min.
According to an embodiment of the application, the calcination is performed in an argon atmosphere, and the temperature rise rate of the calcination is 2-8 ℃ per minute. For example, the rate of temperature rise of calcination may be 2 ℃,3 ℃,4 ℃,5 ℃,6 ℃,7 ℃,8 ℃, or any value between 2-8 ℃ per minute.
According to the embodiment of the application, the calcining temperature is 600-650 ℃, and in the calcining temperature range, the interdiffusion and reaction of Al and Mg elements can be effectively promoted to form a uniform alloy structure, and the melting of Al caused by overhigh temperature can be avoided. If the calcination temperature is too low, an Al-Mg alloy cannot be formed, and if the calcination temperature is too high, the melting point of Al is easily exceeded, so that the substrate is melted.
For example, the temperature of calcination may be 600 ℃, 610 ℃, 620 ℃, 630 ℃, 640 ℃, 650 ℃, or any value between 600-650 ℃.
And/or the calcination time is 5-8h. For example, the calcination time may be 5h, 6h, 7h, 8h, or any value between 5 and 8h.
The application also provides an Al-Mg alloy negative electrode current collector, which is prepared by the preparation method.
The application also provides a negative-electrode-free sodium metal battery, which comprises the Al-Mg alloy negative electrode current collector prepared by the preparation method or the Al-Mg alloy negative electrode current collector.
According to some embodiments of the application, the non-negative sodium metal battery further comprises a positive electrode, a negative electrode, an electrolyte, and a separator.
Embodiments of the present application will be described in detail below with reference to specific examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present application and should not be construed as limiting the scope of the present application. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
Example 1 provides an al—mg alloy negative electrode current collector, the preparation method of which comprises:
Al foil with the thickness of 8 mu m is alternately ultrasonically cleaned for three times by adopting deionized water, acetone and absolute ethyl alcohol, and then is placed into a sputtering chamber. And vacuumizing in the chamber, wherein the vacuum degree is 1.5x10 -2 Pa, and then introducing argon into the chamber to clean the surface of the deposition substrate. The target base distance is set to be 50mm, the sputtering power of the cathode Mg target is 100W, the working pressure is 2Pa, and the sputtering time is 5min. The substrate rotation speed was set at 10r/min. Transferring the sputtered Al substrate into a tube furnace, and preparing the Al-Mg alloy negative electrode current collector under the conditions of heating rate of 2 ℃ per minute, calcining temperature of 600 ℃ and heat preservation time of 5 hours.
Fig. 1 is a scanning electron microscope image of an Al-Mg alloy negative electrode current collector prepared in example 1, and it can be seen from fig. 1 that the Al-Mg alloy has a three-dimensional stripe shape of 0.2x2μm, which increases the specific surface area of a substrate, provides more effective nucleation sites, is beneficial to improving the wettability of an electrolyte, promotes uniform deposition of sodium, and inhibits growth of sodium dendrites.
Example 2
Example 2 provides an al—mg alloy negative electrode current collector, the preparation method of which comprises:
Al foil with the thickness of 20 mu m is alternately ultrasonically cleaned for three times by adopting deionized water, acetone and absolute ethyl alcohol, and then is placed into a sputtering chamber. And vacuumizing in the chamber, wherein the vacuum degree is 1x 10 -2 Pa, and then introducing argon into the chamber to clean the surface of the deposition substrate. The target base distance is set to be 70mm, the sputtering power of the cathode Mg target is 50W, the working pressure is 3Pa, and the sputtering time is 12min. The substrate rotation speed was set at 10r/min. Transferring the sputtered Al substrate into a tube furnace, and preparing the Al-Mg alloy negative electrode current collector under the conditions that the temperature rising rate is 5 ℃ per minute, the calcining temperature is 650 ℃ and the heat preservation time is 8 hours.
Example 3
Example 3 provides an al—mg alloy negative electrode current collector, the preparation method of which comprises:
Al foil with the thickness of 50 mu m is alternately ultrasonically cleaned for three times by deionized water, acetone and absolute ethyl alcohol, and then is placed into a sputtering chamber. And vacuumizing in the chamber, wherein the vacuum degree is 1.2x10 -2 Pa, and then introducing argon into the chamber to clean the surface of the deposition substrate. The target base distance is set to be 60mm, the sputtering power of the cathode Mg target is 80W, the working pressure is 1Pa, and the sputtering time is 10min. The substrate rotation speed was set at 10r/min. Transferring the sputtered Al substrate into a tube furnace, and preparing the Al-Mg alloy negative electrode current collector under the conditions that the temperature rising rate is 8 ℃ per minute, the calcining temperature is 620 ℃ and the heat preservation time is 6 hours.
Example 4
Example 4 provides an Al-Mg alloy negative electrode current collector, the preparation method of which comprises:
Al foil with thickness of 30 μm is alternately ultrasonically cleaned three times by deionized water, acetone and absolute ethyl alcohol, and then is placed into a sputtering chamber. And vacuumizing in the chamber, wherein the vacuum degree is 1.2x10 -2 Pa, and then introducing argon into the chamber to clean the surface of the deposition substrate. The target base distance is set to be 50mm, the sputtering power of the cathode Mg target is 60W, the working pressure is 3Pa, and the sputtering time is 8min. The substrate rotation speed was set at 10r/min. Transferring the sputtered Al substrate into a tube furnace, and preparing the Al-Mg alloy negative electrode current collector under the conditions that the temperature rising rate is 6 ℃ per minute, the calcining temperature is 630 ℃ and the heat preservation time is 7 hours.
Comparative example 1
Commercial aluminum foil with a thickness of 20 μm was used as the negative electrode current collector.
Comparative example 2
Al foil with the thickness of 20 mu m is alternately ultrasonically cleaned for three times by adopting deionized water, acetone and absolute ethyl alcohol, and then is placed into a sputtering chamber. And vacuumizing in the chamber, wherein the vacuum degree is 1x 10 -2 Pa, and then introducing argon into the chamber to clean the surface of the deposition substrate. The target base distance is set to be 70mm, the sputtering power of the cathode Mo target is 50W, the working pressure is 3Pa, and the sputtering time is 12min. The substrate rotation speed was set at 10r/min. Transferring the sputtered Al substrate into a tube furnace, and preparing the Al-Mo negative electrode current collector under the conditions of a temperature rising rate of 5 ℃ per minute, a calcining temperature of 650 ℃ and a heat preservation time of 8 hours.
Comparative example 3
Al foil with the thickness of 20 mu m is alternately ultrasonically cleaned for three times by adopting deionized water, acetone and absolute ethyl alcohol, and then is placed into a sputtering chamber. And vacuumizing in the chamber, wherein the vacuum degree is 1x 10 -2 Pa, and then introducing argon into the chamber to clean the surface of the deposition substrate. The target base distance is set to be 100mm, the sputtering power of the cathode Mg target is 200W, the working pressure is 5Pa, and the sputtering time is 30min. The substrate rotation speed was set at 10r/min. Transferring the sputtered Al substrate into a tube furnace, and preparing the Al-Mg alloy negative electrode current collector under the conditions of a temperature rising rate of 5 ℃ per minute, a calcining temperature of 700 ℃ and a heat preservation time of 4 hours.
Performance test to verify the performance of the current collectors of examples 1 to 4 and comparative examples 1 to 3, the inventors assembled a negative-electrode-free sodium metal battery using the same method using the current collectors of examples 1 to 4 and comparative examples 1 to 3, and tested the electrochemical performance thereof. The method specifically comprises the following steps:
The current collectors of examples 1 to 4 and comparative examples 1 to 3 were cut into electrode plates with a diameter of 12mm, respectively, and as a negative current collector, when the battery was assembled, an Al-Mg alloy layer of the negative current collector faced the positive electrode direction, sodium vanadium phosphate was used as the positive electrode, 1mol/L NaPF 6/ethylene glycol dimethyl ether (DME) was used as the electrolyte, and a button cell was assembled in a glove box, and the whole cell was tested at a current density of 100mA/g, and the experimental results are shown in Table 1.
TABLE 1 results of electrochemical performance tests for examples 1-4 and comparative examples 1-3
As can be seen from table 1, the full cells of examples 1 to 4 have significantly better initial coulombic efficiency and 100-cycle capacity retention than comparative example 1, demonstrating that the Al-Mg alloy negative electrode current collectors prepared in examples 1 to 4 can effectively improve initial coulombic efficiency and cycle stability of the cells as compared to commercial aluminum foils.
Comparative example 2 the Mg target of example 2 was replaced with a Mo target, and the Al-Mo negative electrode current collector prepared in comparative example 2 was significantly superior to comparative example 2 in terms of initial coulombic efficiency and capacity retention rate for 100 cycles of the full cell of example 2, indicating that the Al-Mg alloy negative electrode current collector can effectively improve initial coulombic efficiency and cycle stability of the cell as compared to the Al-Mo alloy negative electrode current collector.
The target base distance, the sputtering power, the working pressure, the sputtering time, the calcining temperature and the heat preservation time of the cathode Mg target of comparative example 3 are different from those of example 2, and the full cell first coulombic efficiency and the capacity retention rate of 100 times of cycle of example 2 are obviously superior to those of comparative example 3, which shows that when the target base distance, the sputtering power, the working pressure, the sputtering time, the calcining temperature and the heat preservation time of the cathode Mg target are within the scope of the application, the Al-Mg alloy cathode current collector can have excellent electrochemical performance.
It should be noted that the above embodiments are merely for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims below, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (10)
1. The preparation method of the Al-Mg alloy negative electrode current collector is characterized by comprising the following steps of:
sputtering magnesium on the surface of an aluminum foil in a magnetron sputtering mode to form a magnesium plating layer on the aluminum foil;
And calcining the aluminum foil with the magnesium coating to obtain the Al-Mg alloy negative current collector, wherein the Al-Mg alloy negative current collector comprises an aluminum substrate layer and an Al-Mg alloy layer positioned on the aluminum substrate layer.
2. The method for preparing an Al-Mg alloy negative electrode current collector according to claim 1, wherein the thickness of the aluminum foil is 8-50 μm;
And/or the target base distance of the magnetron sputtering is 50-70mm.
3. The method for preparing an Al-Mg alloy negative electrode current collector according to claim 1, wherein the vacuum degree of the magnetron sputtering is 1x 10 -2-1.5x 10-2 Pa.
4. The method for preparing an Al-Mg alloy negative electrode current collector according to claim 1, wherein the Mg target power of the magnetron sputtering is 50 to 100W.
5. The method for preparing an Al-Mg alloy negative electrode current collector according to claim 1, wherein the working pressure of the magnetron sputtering is 1-3Pa.
6. The method for preparing an Al-Mg alloy negative electrode current collector according to claim 1, wherein the sputtering time of the magnetron sputtering is 5-12min.
7. The method for preparing an Al-Mg alloy negative electrode current collector according to claim 1, wherein the calcination is performed in an argon atmosphere, and the temperature rise rate of the calcination is 2 to 8 ℃.
8. The method for producing an Al-Mg alloy negative electrode current collector according to any one of claims 1 to 7, wherein the calcination temperature is 600 to 650 ℃;
And/or the calcination time is 5-8h.
9. An Al-Mg alloy negative electrode current collector, characterized in that the Al-Mg alloy negative electrode current collector is prepared by the preparation method according to any one of claims 1 to 8.
10. A negative-electrode-free sodium metal battery, characterized by comprising the Al-Mg alloy negative electrode current collector prepared by the preparation method of any one of claims 1 to 8 or comprising the Al-Mg alloy negative electrode current collector of claim 9.
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