Sodium metal battery cell, method for manufacturing the same, battery, and electric device

Abstract

A sodium metal battery cell and its manufacturing method, battery, and electric device, which belong to the battery technical field. The sodium metal battery cell includes an electrolyte solution containing a first additive including an unsaturated group-containing organic compound, and a catalyst including at least one of a transition metal element and an alloy thereof. It can improve the performance of the sodium metal battery cell. The electrolyte solution containing a first additive including an unsaturated group-containing organic compound, A catalyst including at least one of a transition metal and an alloy thereof; A sodium metal battery cell comprising:

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims priority to Patent Application No. 202310102055.2, titled "Sodium Metal Battery Cell and Its Manufacturing Method, Battery, Electrical Device", filed on February 9, 2023, and all the contents of the said application are incorporated herein by reference. This application relates to the field of battery technology, and particularly to sodium metal battery cells and their manufacturing methods, batteries, and electrical devices.

Background Art

[0002] With the progress of environmental pollution, the new energy industry has increasingly attracted people's attention. In the new energy industry, battery technology is one of the important elements related to its development.

[0003] Due to the abundant reserves and low cost of sodium salt raw materials, the application of sodium metal battery cells has been increasingly emphasized. During the use or storage process of sodium metal battery cells, gases such as hydrogen are generated, which has an adverse effect on the performance of sodium metal battery cells. Therefore, in order to improve the performance of sodium metal battery cells, how to provide sodium metal battery cells has become an urgent technical problem to be solved.

Summary of the Invention

Means for Solving the Problems

[0004] This application is made in view of the above problems, and its purpose is to provide a sodium metal battery cell in order to improve the performance of the sodium metal battery cell.

[0005] To achieve the above object, this application provides a sodium metal battery cell and its manufacturing method, a battery, and an electrical device.

[0006] A first aspect provides a sodium metal battery cell including an electrolyte containing a first additive including an unsaturated group-containing organic compound and a catalyst including at least one of a transition metal alone and its alloy.

[0007] Embodiments of the present application provide a sodium metal battery cell including an electrolyte and a catalyst. The electrolyte includes a first additive including an unsaturated group-containing organic compound, and the catalyst includes at least one of a transition metal alone and its alloy. Thus, when hydrogen is present in the sodium metal battery cell, the action of the catalyst can catalyze the redox reaction between the unsaturated group-containing organic compound and hydrogen in the first additive, thereby consuming at least a part of the hydrogen and reducing the hydrogen content in the sodium metal battery cell. Therefore, this technical solution contributes to improving the reliability of the sodium metal battery cell and can improve the performance of the sodium metal battery cell.

[0008] In one possible implementation, the catalyst includes at least one of platinum, ruthenium, palladium, rhodium, iridium, nickel, cobalt, copper and its alloy.

[0009] In the above technical solution, hydrogen and the unsaturated group-containing organic compound can react on the surface of the above metal or alloy, and the product after the reaction is easily detached from the metal alone and its alloy, contributing to promoting the consumption of hydrogen. On the other hand, the above metal alone or alloy functions as a catalyst and can catalyze the reaction between hydrogen and the unsaturated group-containing organic compound without applying extra pressure to the sodium metal battery cell, facilitating the application of the catalyst in the sodium metal battery cell.

[0010] In one possible implementation, the sodium metal battery cell further includes a positive electrode plate, and the catalyst is included in the positive electrode plate.

[0011] In the above technical solution, the positive electrode plate contains a catalyst. Thus, both hydrogen in the sodium metal battery cell and the first additive in the electrolytic solution can not only contact the catalyst and react on the surface of the catalyst, but also facilitate the provision of the catalyst in the sodium metal battery cell.

[0012] In one possible implementation, the positive electrode plate includes a positive electrode current collector and a positive electrode film layer on the surface of the positive electrode current collector, and the catalyst is included in the positive electrode film layer.

[0013] In the above technical solution, the positive electrode film layer contacts the electrolytic solution, and the catalyst is included in the positive electrode film layer, which facilitates the contact between the catalyst and the first additive in the electrolytic solution and hydrogen in the sodium metal battery.

[0014] In one possible implementation, the positive electrode film layer includes a positive electrode active material, the positive electrode active material includes a positive electrode active material core and a coating layer covering the positive electrode active material core, and the catalyst is included in the coating layer.

[0015] In the above technical solution, the positive electrode film layer contacts the electrolytic solution, and the catalyst is included in the coating layer of the positive electrode active material in the positive electrode film layer, which facilitates the contact between the catalyst and the first additive in the electrolytic solution and hydrogen in the sodium metal battery.

[0016] In one possible implementation, the coating layer includes a coating layer body covering the positive electrode active material core and the catalyst on the surface of the coating layer body.

[0017] In the above technical solution, the catalyst is located on the surface of the coating layer body, thus facilitating the contact between the catalyst and the first additive in the electrolytic solution and hydrogen in the sodium metal battery.

[0018] In one possible implementation, the coating layer body includes at least one of aluminum oxide, silicon oxide, and carbon.

[0019] In the above technical solution, materials such as aluminum oxide, silicon oxide, and carbon in the coating layer body can carry a catalyst as a carrier by adding the catalyst to the coating layer. In addition, the installation of the coating layer body contributes to further improving the performance of the positive electrode active material, for example, by improving the surface stability of the positive electrode active material, promoting the transmission of sodium ions in the positive electrode active material, and reducing the alkali compounds remaining on the surface of the positive electrode active material.

[0020] In one possible implementation form, the sodium metal battery cell further includes a separator for isolating the positive electrode plate and the negative electrode plate in the sodium metal battery. The separator includes a base film layer and a first coating on the surface of the base film layer, and the first coating includes the catalyst.

[0021] In the above technical solution, the separator is in contact with the electrolyte, and the first coating of the separator contains a catalyst, so that it is easy to realize the contact between the catalyst and the first additive in the electrolyte and hydrogen in the sodium metal battery.

[0022] In one possible implementation form, the first coating includes a functional material, and the functional material includes a functional material body and a catalyst on the surface of the functional material body.

[0023] In the above technical solution, the catalyst is located on the surface of the functional material body, so that it is easy to realize the contact between the catalyst and the first additive in the electrolyte and hydrogen in the sodium metal battery.

[0024] In one possible implementation form, the functional material body includes aluminum oxide.

[0025] In the above technical solution, aluminum oxide can carry a catalyst as a carrier by adding the catalyst to the first coating.

[0026] In one possible implementation, the sodium metal battery cell further includes a case for containing the electrolyte, and a second coating is provided on the inner wall of the case, and the second coating contains the catalyst.

[0027] In the above technical solution, the inner wall of the case contacts the electrolyte, and a second coating is provided on the inner wall of the case, and the second coating contains the catalyst. In this way, it is easy to realize the contact between the catalyst and the first additive in the electrolyte and hydrogen in the sodium metal battery.

[0028] In one possible implementation, the sodium metal battery cell further includes a negative electrode plate, and the negative electrode plate is a negative electrode current collector.

[0029] In the above technical solution, the negative electrode plate of the sodium metal battery cell is a negative electrode current collector. In this way, it is not necessary to provide a negative electrode active material on the surface of the negative electrode current collector during the manufacturing process of the battery cell, which contributes to reducing the mass and volume of the sodium metal battery cell and increasing the energy density of the sodium metal battery cell.

[0030] In one possible implementation, the mass ratio of the first additive to the electrolyte is 0.1% - 5%, and optionally 1% - 5%.

[0031] In the above technical solution, the mass ratio of the first additive to the electrolyte is 0.1% - 5%. In this way, not only can the hydrogen content in the sodium metal battery cell be reduced, but also the risk of side reactions caused by the first additive with too high a content and the adverse effect on the energy density of the sodium metal battery cell can be reduced, contributing to improving the performance of the sodium metal battery cell. When the mass ratio of the first additive to the electrolyte is 1% - 5%, it contributes to further improving the performance of the sodium metal battery cell.

[0032] In one possible embodiment, the first additive includes at least one of phenylacetylene, styrene, phenol, 1,3,5-triphenylacetylene, naphthalene, benzene, N-ethylcarbazole, toluene, monobenzyltoluene, dibenzyltoluene, and cinnamaldehyde. Optionally, the first additive includes at least one of phenol, phenylacetylene, and naphthalene.

[0033] In the above technical solution, the type of the first additive can be flexibly selected according to the actual situation. When the first additive includes at least one of phenol, phenylacetylene, and naphthalene, the consumption effect of the first additive on hydrogen is higher, which contributes to further reducing the hydrogen content in the sodium metal battery cell.

[0034] In one possible embodiment, the content of the catalyst in the sodium metal battery cell is 0.01 μg / mAh to 1000 μg / mAh, optionally 1 μg / mAh to 500 μg / mAh.

[0035] In the above technical solution, the content of the catalyst in the sodium metal battery cell is 0.01 μg / mAh to 1000 μg / mAh. In this way, not only can the reaction between hydrogen and the first additive be catalyzed, but also the decrease in the energy density of the battery cell caused by an excessive amount of catalyst can be reduced, achieving both the reliability and energy density of the sodium metal battery cell. The content of the catalyst in the sodium metal battery cell is 1 μg / mAh to 500 μg / mAh, which contributes to further achieving both the reliability and energy density of the sodium metal battery cell.

[0036] A second aspect provides an electrode assembly and a case, comprising the steps of accommodating the electrode assembly in the case and injecting an electrolyte containing a first additive including an unsaturated group-containing organic compound into the case, wherein a catalyst is provided on the inner wall of the electrode assembly and / or the case, and the catalyst includes at least one of a transition metal simple substance and its alloy, to provide a method for manufacturing a sodium metal battery cell.

[0037] In an embodiment of the present application, hydrogen in the sodium metal battery cell manufactured by the above technical solution can react with the first additive under the action of the catalyst, reduce the hydrogen content in the sodium metal battery cell, and contribute to improving the performance of the sodium metal battery cell.

[0038] In one possible implementation, the first additive includes at least one of platinum, ruthenium, palladium, rhodium, iridium, nickel, cobalt, copper and its alloys.

[0039] In one possible implementation, the mass ratio of the first additive to the electrolyte is 0.1% - 5%, and optionally 1% - 5%.

[0040] In one possible implementation, the first additive includes at least one of phenylacetylene, styrene, phenol, 1,3,5 - triphenylacetylene, naphthalene, benzene, N - ethylcarbazole, toluene, monobenzyltoluene, dibenzyltoluene, cinnamaldehyde, and optionally, the first additive includes at least one of phenol, phenylacetylene, naphthalene.

[0041] In one possible implementation, the content of the catalyst is 0.01 μg / mAh - 1000 μg / mAh, and optionally 1 μg / mAh - 500 μg / mAh.

[0042] A third aspect provides a battery including a sodium metal battery cell in the first aspect and any one possible implementation form thereof, or a sodium metal battery cell manufactured by the method in the second aspect and any one possible implementation form thereof.

[0043] A fourth aspect provides an electrical device including the battery described in the third aspect.

[0044] An embodiment of the present application provides a sodium metal battery cell including an electrolyte and a catalyst. The electrolyte includes a first additive containing an unsaturated group-containing organic compound, and the catalyst includes at least one of a transition metal element and its alloy. Thus, when hydrogen is present in the sodium metal battery cell, the catalyst can catalyze the redox reaction between the unsaturated group-containing organic compound and hydrogen in the first additive, thereby consuming at least part of the hydrogen and reducing the hydrogen content in the sodium metal battery cell. Therefore, this technical solution contributes to improving the reliability of the sodium metal battery cell and can improve the performance of the sodium metal battery cell.

Brief Description of the Drawings

[0045]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying out the Invention

[0046] Hereinafter, embodiments specifically disclosing the sodium metal battery cell, its manufacturing method, battery, and electrical device of the present application will be described in detail with appropriate reference to the drawings. However, detailed descriptions of unnecessary details may be omitted. For example, detailed descriptions of well-known matters and duplicate descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to enable those skilled in the art to easily understand. Also, the drawings and the following description are provided for those skilled in the art to fully understand the present application and are not intended to limit the gist described in the claims.

[0047] The "range" disclosed in the present application is limited in the form of a lower limit and an upper limit. A predetermined range is limited by selecting one lower limit and one upper limit, and the selected lower limit and upper limit limit the boundary of the predetermined range. The range thus limited may include both end values, or may not include both end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range. For example, when ranges of 60 to 120 and 80 to 110 are listed for a certain parameter, ranges of 60 to 110 and 80 to 120 are also understood to be expected. Also, when 1 and 2 are listed as the values of the minimum range and 3, 4, and 5 are listed as the values of the maximum range, ranges of 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5 are all predictable. In the present application, unless otherwise stated, the numerical range "a~b" represents an abbreviated expression of any combination of real numbers between a and b, and both a and b are real numbers. For example, the numerical range "0~5" means that all real numbers between "0~5" are listed in this specification, and "0~5" is simply an abbreviated expression of the combination of these numerical values. In addition, when it is described that a certain parameter is an integer ≧2, it corresponds to disclosing that the parameter is, for example, the integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. Unless otherwise specifically described, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions. Unless otherwise specifically described, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0048] Unless otherwise specified, all steps of the present application may be performed in order, randomly, preferably in order. For example, when it is stated that the method includes steps (a) and (b), it means that the method may include steps (a) and (b) performed in order, or steps (b) and (a) performed in order. For example, when it is mentioned that the method can further include step (c), it means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b) and (c), steps (a), (c) and (b), or steps (c), (a) and (b).

[0049] As the applications of lithium-ion battery technology in the fields of electronic devices, electric vehicles, energy storage, etc. become increasingly widespread, problems such as the shortage of lithium resources and the soaring prices have become more prominent. Since the physical and chemical properties of sodium and lithium are similar, and the reserves of sodium raw materials are abundant and inexpensive, the use of sodium-ion batteries has been increasingly emphasized. However, the energy density and cycle performance of sodium-ion batteries are relatively low, which limits the popularization and application of sodium-ion batteries. Compared with sodium-ion batteries, the sodium metal anode of sodium metal batteries has a high theoretical specific capacity and a low operating potential, so sodium metal batteries have a high energy density.

[0050] However, during the use or storage process of sodium metal batteries, a large amount of hydrogen is generated in sodium metal batteries, which is disadvantageous for improving the reliability of sodium metal batteries and the performance improvement of sodium metal batteries.

[0051] In view of this, the present application provides a sodium metal battery cell including an electrolyte and a catalyst. The electrolyte includes a first additive containing an unsaturated group-containing organic compound, and the catalyst includes at least one of a transition metal simple substance and its alloy. Under the catalysis of the catalyst, the unsaturated group-containing organic compound undergoes a redox reaction with hydrogen in the sodium metal battery cell, consumes at least a part of the hydrogen, reduces the hydrogen content in the sodium metal battery cell, can improve the reliability of the sodium metal battery cell, and can improve the performance of the sodium metal battery cell.

[0052] [Sodium metal battery cell] Examples of the present application provide a sodium metal battery cell including an electrolyte and a catalyst.

[0053] The electrolyte includes a first additive containing an unsaturated group-containing organic compound.

[0054] The unsaturated group can include groups such as a carbon-carbon double bond, a carbon-carbon triple bond, a carbon-oxygen triple bond, a carbon-nitrogen triple bond, and a benzene ring. The unsaturated group-containing organic compound is prone to addition reactions, such as undergoing a redox reaction with hydrogen. Taking the case where the unsaturated group is a carbon-carbon double bond as an example, during the process of the carbon-carbon double bond undergoing an addition reaction with hydrogen, the carbon-carbon double bond opens, hydrogen is consumed, and finally a carbon-carbon single bond is formed (this addition reaction may also be referred to as a hydrogenation reaction).

[0055] The catalyst includes at least one of a transition metal simple substance and its alloy.

[0056] The catalyst includes a transition metal simple substance, and the transition metal simple substance can include a simple substance formed by an element of Group d in the periodic table of elements. For example, palladium and platinum can be mentioned.

[0057] The catalyst includes an alloy of a transition metal simple substance such as a palladium molybdenum alloy and a platinum palladium alloy.

[0058] By adding a catalyst to a sodium metal battery cell, the reaction between an unsaturated group and hydrogen can be catalyzed. Specifically, hydrogen dissociates and adsorbs on the surface of the catalyst, and the unsaturated group-containing organic compound adsorbs on the surface of the catalyst. In this way, after the dissociation of hydrogen, the hydrogen reacts with the unsaturated group on the surface of the catalyst, and the hydrogen in the sodium metal battery cell is consumed. Compared with the direct reaction between hydrogen and the unsaturated group, the addition of the catalyst reduces the energy barrier of the reaction between hydrogen and the unsaturated group, making the reaction between hydrogen and the unsaturated group easier to occur.

[0059] After hydrogen undergoes a hydrogenation reaction with an unsaturated group-containing organic compound, a hydrogenation product is formed on the surface of the catalyst. For example, a carbon-carbon triple bond becomes a carbon-carbon double bond or a carbon-carbon single bond, a carbonyl becomes a hydroxy group, and benzene becomes cyclohexane.

[0060] In the present application, the shape of the sodium metal battery cell is not particularly limited and may be cylindrical, square, or any other arbitrary shape. FIG. 1 is a schematic diagram of a sodium metal battery cell according to an embodiment of the present application. For example, as shown in FIG. 1, the sodium metal battery cell 3 is square and includes a case 31, a cover plate 32, and an electrode assembly 33 provided in the case 31. The case 31 and the cover plate 32 can be used to package the electrode assembly 33 and the electrolyte.

[0061] The case 31 and the cover plate 32 may be a hard case such as a hard plastic case, an aluminum case, or a steel case. The case 31 and the cover plate 32 may also be a soft pack such as a bag-type soft pack. The material of the soft pack may be plastic, and examples of the plastic include polypropylene, polybutylene terephthalate, and polybutylene succinate.

[0062] The electrode assembly 33 includes a positive electrode plate, a negative electrode plate, and a separator, and the electrode assembly 33 can be manufactured by a winding process or a lamination process using the positive electrode plate, the negative electrode plate, and the separator.

[0063] The electrolyte can further contain an electrolyte salt and an organic solvent. The electrolyte salt may be sodium hexafluorophosphate (NaPF6), and the organic solvent may be a carbonate or an ether-based solvent. The carbonate-based solvent includes cyclic ethylene carbonate (EC), propylene carbonate (PC), fluoroethylene carbonate (FEC), and chain-like dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), etc. The ether-based solvent includes ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, tetrahydrofuran, 1,3-dioxolane, etc.

[0064] Examples of the present application provide a sodium metal battery cell including an electrolyte and a catalyst. The electrolyte includes a first additive containing an unsaturated group-containing organic compound, and the catalyst includes at least one of a transition metal simple substance and its alloy. Thus, when hydrogen is present in the sodium metal battery cell, the action of the catalyst can catalyze the redox reaction between the unsaturated group-containing organic compound and hydrogen in the first additive, thereby consuming at least a part of the hydrogen and reducing the hydrogen content in the sodium metal battery cell. Therefore, this technical solution contributes to enhancing the reliability of the sodium metal battery cell and can improve the performance of the sodium metal battery cell.

[0065] In some examples, the catalyst includes at least one of platinum, ruthenium, palladium, rhodium, iridium, nickel, cobalt, copper, and their alloys.

[0066] The catalyst may be a simple metal or an alloy containing the above simple metal. For example, the catalyst is a nickel-cobalt alloy, a palladium-molybdenum alloy, a platinum-palladium alloy, a platinum-iridium alloy, a platinum-rhodium alloy, a platinum-nickel alloy, a platinum-cobalt alloy, or an iridium-nickel alloy.

[0067] The dissociation and adsorption ability of the above-mentioned simple metal and its alloy with respect to hydrogen is strong. When hydrogen adsorbs on the surface of the above-mentioned simple metal and its alloy, it is easy to dissociate on the surface. The adsorption ability of the above-mentioned simple metal and its alloy with respect to unsaturated group-containing organic compounds is medium. Thus, unsaturated group-containing organic compounds easily react with hydrogen on the surface of the above-mentioned simple metal and its alloy, and the product after the reaction can desorb from the surface of the above-mentioned simple metal and its alloy. Hydrogen can easily continue to react with unsaturated group-containing organic compounds on the surface of the simple metal and its alloy. Therefore, by selecting the above-mentioned simple metal and its alloy as a catalyst, it contributes to promoting the reaction between hydrogen and unsaturated group-containing organic compounds and can promote the consumption of hydrogen.

[0068] In a sodium metal battery cell, the above-mentioned simple metal and alloy function as a catalyst, and without applying excessive pressure to the sodium metal battery cell, it can catalyze the reaction between hydrogen and unsaturated group-containing organic compounds, and it is easy to realize the application of the catalyst in the sodium metal battery cell.

[0069] In the above-mentioned embodiment, by selecting the above-mentioned simple metal and its alloy as a catalyst, it not only contributes to promoting the consumption of hydrogen, but also makes it easier to apply the catalyst to a sodium metal battery cell.

[0070] In some embodiments, the sodium metal battery cell further includes a positive electrode plate, and the positive electrode plate contains a catalyst.

[0071] In a sodium metal battery cell, the positive electrode plate contains a catalyst, and the electrolyte contains a first additive containing an unsaturated group-containing organic compound. Since the positive electrode plate contacts the electrolyte, unsaturated group-containing organic compounds and hydrogen can react on the surface of the positive electrode plate, and hydrogen in the sodium metal battery cell can be consumed.

[0072] The positive electrode plate contains a catalyst, that is, by adding a catalyst in the manufacturing process of the positive electrode plate, the catalyst can be made a part of the positive electrode plate. Thus, it becomes easier to provide the catalyst in the sodium metal battery cell.

[0073] In the above embodiments, the positive electrode plate contains a catalyst. Thus, both the hydrogen in the sodium metal battery cell and the first additive in the electrolyte can not only contact the catalyst and react on the surface of the catalyst, but also facilitate the provision of the catalyst to the sodium metal battery cell.

[0074] In some embodiments, the positive electrode plate includes a positive electrode current collector and a positive electrode film layer on the surface of the positive electrode current collector, and the positive electrode film layer contains a catalyst.

[0075] The positive electrode current collector has two surfaces facing each other in its own thickness direction, and the positive electrode film layer is provided on one or both of the two opposing surfaces of the positive electrode current collector.

[0076] Optionally, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, an aluminum foil can be employed. The composite current collector can include a polymer material base layer and a metal layer formed on at least one surface of the polymer material base layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as substrates like polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] The positive electrode film layer can further include a positive electrode active material, a conductive agent, and an adhesive. For example, the positive electrode active material is a sodium-containing transition metal oxide, the conductive agent is carbon black, and the adhesive is polyvinylidene fluoride.

[0078] In this embodiment, the positive electrode active material, the conductive agent, the adhesive, and the catalyst can be mixed to form a slurry, and then applied to the surface of the positive electrode current collector to form the positive electrode film layer.

[0079] In the above embodiments, the positive electrode film layer contacts the electrolyte, and the positive electrode film layer contains a catalyst, which facilitates the contact between the catalyst and the first additive in the electrolyte and hydrogen in the sodium metal battery.

[0080] In some embodiments, the positive electrode film layer contains a positive electrode active material, the positive electrode active material includes a positive electrode active material core and a coating layer covering the positive electrode active material core, and the coating layer contains a catalyst.

[0081] The positive electrode active material core can include at least one of a layered transition metal oxide, a polyanion-type compound, and a Prussian blue compound.

[0082] In the above embodiments, the positive electrode film layer is in contact with the electrolyte, and the coating layer of the positive electrode active material in the positive electrode film layer contains a catalyst, which facilitates the contact between the catalyst and the first additive in the electrolyte and hydrogen in the sodium metal battery.

[0083] In some embodiments, the coating layer includes a coating layer main body covering the positive electrode active material core and a catalyst on the surface of the coating layer main body.

[0084] In the above embodiments, the catalyst is located on the surface of the coating layer main body, thus facilitating the contact between the catalyst and the first additive in the electrolyte and hydrogen in the sodium metal battery.

[0085] In some embodiments, the coating layer main body includes at least one of aluminum oxide, silicon oxide, and carbon.

[0086] In the above embodiments, materials such as aluminum oxide, silicon oxide, and carbon in the coating layer main body can support the catalyst as a carrier to add the catalyst to the coating layer. Also, the installation of the coating layer main body contributes to further improving the performance of the positive electrode active material, for example, enhancing the surface stability of the positive electrode active material, promoting the transmission of sodium ions in the positive electrode active material, and reducing the alkali compounds remaining on the surface of the positive electrode active material.

[0087] In some embodiments, the sodium metal battery cell further includes a separator for isolating the positive electrode plate and the negative electrode plate in the sodium metal battery. The separator includes a base film layer and a first coating on the surface of the base film layer, and the first coating contains a catalyst.

[0088] In this embodiment, the separator may be a composite thin film. The base film layer has two surfaces facing each other in its own thickness direction, and the first coating can be provided on either one or both of the two opposing surfaces of the base film layer.

[0089] The material of the base film layer of the separator can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0090] In the above embodiment, the separator is in contact with the electrolyte, and the first coating of the separator contains a catalyst, thus facilitating the contact between the catalyst and the first additive in the electrolyte and hydrogen in the sodium metal battery.

[0091] In some embodiments, the first coating contains a functional material, and the functional material includes a functional material body and a catalyst on the surface of the functional material body.

[0092] In the above embodiment, the catalyst is located on the surface of the functional material body, thus facilitating the contact between the catalyst and the first additive in the electrolyte and hydrogen in the sodium metal battery.

[0093] In some embodiments, the functional material body includes aluminum oxide.

[0094] In the above embodiment, aluminum oxide can support the catalyst as a carrier so as to add the catalyst to the first coating, and aluminum oxide also contributes to further enhancing the high-temperature resistance performance of the separator.

[0095] In some embodiments, the sodium metal battery cell further includes a case for containing an electrolyte, and a second coating is provided on the inner wall of the case, and the second coating contains a catalyst.

[0096] For example, referring to FIG. 1, a second coating is provided on the inner wall of the case 31, and the catalyst in the second coating can contact the electrolyte in the case 31.

[0097] Optionally, the second coating further contains a material such as aluminum oxide. The catalyst can adhere to the aluminum oxide, that is, the aluminum oxide can function as a carrier for supporting the catalyst so that the catalyst is provided on the second coating.

[0098] In the above embodiments, the inner wall of the case contacts the electrolyte, and a second coating is provided on the inner wall of the case. The second coating contains a catalyst. In this way, it is easy to realize the contact between the catalyst and the first additive in the electrolyte and hydrogen in the sodium metal battery.

[0099] In some embodiments, the sodium metal battery cell further includes a negative electrode plate, and the negative electrode plate is a negative electrode current collector.

[0100] The fact that the negative electrode plate is a negative electrode current collector can indicate that no active material layer is provided on the negative electrode current collector. In some embodiments, in order to normally use the negative electrode plate, a conductive film layer can be deposited on the negative electrode current collector.

[0101] The negative electrode plate is a negative electrode current collector, that is, the negative electrode current collector functions as a negative electrode plate. This type of sodium metal battery cell may be referred to as a "negative electrode-free battery". During the charging process, sodium ions detached from the positive electrode plate are deposited on the negative electrode current collector to form a sodium metal negative electrode.

[0102] In the above embodiments, the negative electrode plate of the sodium metal battery cell is the negative electrode current collector. In this way, there is no need to provide the negative electrode active material on the surface of the negative electrode current collector during the manufacturing process of the battery cell, which contributes to reducing the mass and volume of the sodium metal battery cell and increasing the energy density of the sodium metal battery cell.

[0103] In some embodiments, the mass ratio of the first additive to the electrolyte is 0.1% - 5%, and optionally 1% - 5%. For example, the mass ratios of the first additive to the electrolyte are 0.1%, 1%, and 5%.

[0104] When the mass ratio of the first additive to the electrolyte is less than 0.1%, since the content of the first additive is small, the number of unsaturated groups in the electrolyte is small, and the consumption of hydrogen in the sodium metal battery cell is small.

[0105] When the mass ratio of the first additive to the electrolyte is greater than 5%, since the content of the first additive is large, it is disadvantageous for improving the energy density of the sodium metal battery cell, and also the risk of side reactions occurring in the first additive increases.

[0106] In the above embodiments, the mass ratio of the first additive to the electrolyte is 0.1% - 5%. In this way, not only can the hydrogen content in the sodium metal battery cell be reduced, but also the risk of side reactions caused by the first additive with too high a content and the adverse effects on the energy density of the sodium metal battery cell can be reduced, contributing to improving the performance of the sodium metal battery cell.

[0107] When the mass ratio of the first additive to the electrolyte is 1% - 5%, it contributes to further balancing the hydrogen consumption and the energy density of the sodium metal battery cell, and contributes to further improving the performance of the sodium metal battery cell.

[0108] In some embodiments, the first additive is phenylacetylene (C8H6), styrene (C8H8), phenol (C6H6O), 1,3,5 - triphenylacetylene (C 12H6), naphthalene (NAP), benzene (BZ), N-ethylcarbazole (NEC), toluene (TOL), monobenzyltoluene (MBT), dibenzyltoluene (DBT), cinnamaldehyde (C9H8O), and selectively, the first additive contains at least one of phenol, phenylacetylene, and naphthalene.

[0109] In the above embodiments, the type of the first additive can be flexibly selected according to the actual situation. When the first additive contains at least one of phenol, phenylacetylene, and naphthalene, the consumption effect of the first additive on hydrogen is higher, which contributes to further reducing the hydrogen content in the sodium metal battery cell.

[0110] In some embodiments, the content of the catalyst in the sodium metal battery cell is 0.01 μg / mAh to 1000 μg / mAh, and selectively 1 μg / mAh to 500 μg / mAh.

[0111] When the content of the catalyst in the sodium metal battery cell is less than 0.01 μg / mAh, since the content of the catalyst is small, the catalytic effect of the reaction between hydrogen and the unsaturated group-containing organic compound is weak, and the consumption of hydrogen in the sodium metal battery cell is small.

[0112] When the content of the catalyst in the sodium metal battery cell is greater than 1000 μg / mAh, the content of the catalyst is high, which is disadvantageous to the improvement of the energy density of the sodium metal battery cell.

[0113] In the above embodiments, the content of the catalyst in the sodium metal battery cell is 0.01 μg / mAh to 1000 μg / mAh. In this way, not only can the reaction between hydrogen and the first additive be catalyzed, but also the decrease in the energy density of the battery cell caused by the catalyst with too high a content can be reduced, and the reliability and energy density of the sodium metal battery cell can be made compatible.

[0114] The catalyst content in the sodium metal battery cell is 1 μg / mAh to 500 μg / mAh, which contributes to further achieving both the reliability and energy density of the sodium metal battery cell.

[0115] In some embodiments, the reaction temperature of the first additive and hydrogen in the sodium metal battery cell is 20°C to 60°C, such as 20°C or 60°C.

[0116] Optionally, the reaction temperature of the first additive and hydrogen in the sodium metal battery cell is the operating temperature of the sodium metal battery cell. For example, when the sodium metal battery cell is used in a vehicle, the temperature of the sodium metal battery cell during the driving and charging processes of the vehicle is, for example, 20°C to 30°C.

[0117] Optionally, the temperature inside the sodium metal battery cell can be further set according to the actual situation. For example, the temperature is 30°C or 50°C.

[0118] In the above embodiments, when the temperature is 20°C to 60°C, it not only contributes to the reaction between the first additive and hydrogen, but also can reduce the adverse effects on the sodium metal battery cell caused by too high a temperature.

[0119] In the above, the technical solution of the sodium metal battery cell of the present application has been described with reference to FIG. 1. Hereinafter, the manufacturing method of the sodium metal battery cell will be described with reference to FIG. 2. The parts corresponding to the sodium metal battery cell can refer to the above content and will not be repeatedly described here.

[0120] [Manufacturing Method of Sodium Metal Battery Cell] FIG. 2 is a schematic diagram of a manufacturing method of a sodium metal battery cell according to an embodiment of the present application. As shown in FIG. 2, method 200 includes step 210 and step 220.

[0121] In step 210, an electrode assembly and a case are provided, and the electrode assembly is accommodated in the case. A catalyst is provided on the inner wall of the electrode assembly and / or the case, and the catalyst contains at least one of a transition metal simple substance and its alloy.

[0122] The provision of the catalyst on the electrode assembly may mean that the positive electrode plate contains the catalyst or the separator contains the catalyst.

[0123] The provision of the catalyst on the inner wall of the electrode assembly and / or the case can include the case where the catalyst is provided only on the electrode assembly, the case where the catalyst is provided only on the inner wall of the case, and the case where the catalyst is provided on both the inner wall of the electrode assembly and the case.

[0124] In step 220, an electrolytic solution is injected into the case. The electrolytic solution contains a first additive containing an unsaturated group-containing organic compound.

[0125] In the embodiments of the present application, hydrogen in the sodium metal battery cell manufactured by the above technical solution can react with the first additive under the action of the catalyst, reduce the hydrogen content in the sodium metal battery cell, and contribute to improving the performance of the sodium metal battery cell.

[0126] In some embodiments, the first additive contains at least one of platinum, ruthenium, palladium, rhodium, iridium, nickel, cobalt, copper and its alloy.

[0127] In some embodiments, the mass ratio of the first additive to the electrolytic solution is 0.1% - 5%, and optionally 1% - 5%.

[0128] In some embodiments, the first additive includes at least one of phenylacetylene, styrene, phenol, 1,3,5-triphenylacetylene, naphthalene, benzene, N-ethylcarbazole, toluene, monobenzyltoluene, dibenzyltoluene, and cinnamaldehyde. Optionally, the first additive includes at least one of phenol, phenylacetylene, and naphthalene.

[0129] In some embodiments, the catalyst content is from 0.01 μg / mAh to 1000 μg / mAh, and optionally from 1 μg / mAh to 500 μg / mAh.

[0130] In some embodiments, the reaction temperature of hydrogen and the first additive in the sodium metal battery cell is from 20°C to 60°C.

[0131] [Battery] The embodiments of the present application provide a battery including any one of the sodium metal battery cells described in the above embodiments or a sodium metal battery cell manufactured by any one of the methods described in the above embodiments.

[0132] FIG. 3 is a schematic diagram of a battery according to an embodiment of the present application. As shown in FIG. 3, the present application provides a battery 5 including the sodium metal battery cell 3 in any one of the above embodiments. The sodium metal battery cell 3 may directly constitute the battery 5, or may first constitute a battery module, and further constitute the battery 5 with a plurality of battery modules.

[0133] [Electrical device] The embodiments of the present application provide an electrical device including the battery described in the above embodiments.

[0134] FIG. 4 is a schematic diagram of an electrical device according to an embodiment of the present application. As shown in FIG. 4, the present application provides an electrical device 6 including the battery 5 in the above embodiments.

[0135] Hereinafter, embodiments of the present application will be described. The embodiments described below are exemplary and are merely for interpreting the present application and should not be understood as limiting the present application. When specific technologies or conditions are not specified in the embodiments, they are carried out according to the technologies or conditions described in the literature in the relevant field or according to the product specifications. When the manufacturer of the reagents or equipment used is not specified, they are all ordinary commercially available products.

[0136] [Embodiment] Embodiment 1 In the sodium metal battery cell of Embodiment 1, the first additive is phenylacetylene, the catalyst is platinum metal, and the catalyst is provided on the coating layer of the positive electrode active material. The mass ratio A of the first additive to the electrolyte is 1%, and the content B of the catalyst in the sodium metal battery cell was 10 μg / mAh. In the sodium metal battery cell, the electrolyte salt in the electrolyte was NaPF6, and the solvent was ethylene glycol dimethyl ether.

[0137] Embodiments 2 - 7 The difference between Embodiments 2 - 7 and Embodiment 1 is that the mass ratio A of the first additive to the electrolyte is different. In Embodiments 2 - 7, A was 0.5%, 0.1%, 3%, 5%, 0.05%, and 10% respectively.

[0138] Embodiments 8 - 17 The difference between Embodiments 8 - 17 and Embodiment 1 is that the content B of the catalyst in the sodium metal battery cell is different. In Embodiments 8 - 17, B was 1 μg / mAh, 0.01 μg / mAh, 50 μg / mAh, 100 μg / mAh, 300 μg / mAh, 500 μg / mAh, 800 μg / mAh, 1000 μg / mAh, 0.001 μg / mAh, and 2000 μg / mAh respectively.

[0139] Embodiments 18 - 21 The difference between Embodiments 18 - 21 and Embodiment 1 is that the type of the first additive is different. In Embodiments 18 - 21, the first additive was phenol, naphthalene, toluene, and cinnamaldehyde respectively.

[0140] Examples 22 - 26 The difference between Examples 22 - 26 and Example 1 lies in the different types of catalysts. In Examples 22 - 26, the catalysts were palladium metal, ruthenium metal, platinum - cobalt alloy, platinum - palladium alloy, and iridium - nickel alloy, respectively.

[0141] Examples 27 - 29 The difference between Examples 27 - 29 and Example 1 lies in the different specific positions of the catalyst.

[0142] In Example 27, the catalyst was provided within the positive electrode film layer. Specifically, by impregnation and sintering, the catalyst was supported on aluminum oxide. After mixing the above - mentioned aluminum oxide powder supporting the catalyst, PVDF as an adhesive, a positive electrode active material, and a conductive agent to form a slurry, it was applied to the positive electrode current collector, and after drying, the positive electrode film layer was formed.

[0143] In Example 28, the catalyst was provided within the second coating on the inner wall of the case. Specifically, by impregnation and sintering, the catalyst was supported on aluminum oxide. After making a slurry of the above - mentioned aluminum oxide powder supporting the catalyst, it was applied to the inner wall of the case, and after drying, the second coating was formed.

[0144] In Example 29, the catalyst was provided within the first coating on the surface of the base film layer of the separator. Specifically, by impregnation and sintering, the catalyst was supported on aluminum oxide. After making a slurry of the above - mentioned aluminum oxide powder supporting the catalyst and an adhesive, it was applied to the base film layer, and after drying, the first coating was formed. The material of the base film layer was polyethylene.

[0145] Example 30 The difference between Example 30 and Example 1 is that sodium metal was pre - deposited on the negative electrode of Example 30, that is, Examples 1 - 29 are "negative - electrode - free" sodium - metal batteries.

[0146] Comparative Example 1 Compared with Example 1, in Comparative Example 1, the electrolyte in the sodium metal battery cell did not contain the first additive, and no catalyst was provided in the sodium metal battery cell.

[0147] [Manufacture of Sodium Metal Battery Cell] (1) Manufacture of Positive Electrode Plate Manufacture of the positive electrode plates of Examples 1 to 26: First, CuO, Fe2O3, Mn2O3 of metal oxides and sodium carbonate of sodium salt are uniformly mixed according to the ratio, placed in the crucible of a box-type furnace, sintered according to a specific sintering procedure, and after the sintering is completed and cooled to room temperature, crushing treatment is performed to obtain positive electrode active material nuclei.

[0148] Weigh 20 nm of Al2O3, ammonium dihydrogen phosphate, and a catalyst (the catalysts of different examples can refer to Table 1) according to a certain ratio, uniformly mix them by a ball mill, and then uniformly mix the mixture and the above positive electrode active material nuclei by a mixing device according to a specific ratio. The mixed material is put into a muffle furnace and sintered at 350 °C for 8 h, and dry air is passed through during the process. After the heating is completed, it is naturally cooled to room temperature to obtain a positive electrode active material provided with a catalyst.

[0149] The positive electrode active material provided with a catalyst, the conductive agent Super P, the adhesive polyvinylidene fluoride (PVDF), and N-methylpyrrolidone (NMP) are uniformly mixed according to a weight ratio of 80:15:5 to obtain a positive electrode slurry. The positive electrode slurry is uniformly coated on the aluminum foil of the positive electrode current collector. After the aluminum foil is dried at room temperature, it is transferred to an oven at 120 °C and dried for 1 h, and then a positive electrode plate is obtained through cold pressing and cutting.

[0150] Manufacture of the positive electrode plate of Example 27: The catalyst platinum metal, the positive electrode active material (that is, the positive electrode active material nuclei obtained in Examples 1 to 26), the conductive agent Super P, and the adhesive PVDF are uniformly mixed to obtain a positive electrode slurry. The positive electrode slurry is uniformly coated on the aluminum foil of the positive electrode current collector. After the aluminum foil is dried at room temperature, it is transferred to an oven at 120 °C and dried for 1 h, and then a positive electrode plate is obtained through cold pressing and cutting.

[0151] Manufacture of the positive electrode plates of Examples 28 to 30: The positive electrode active material (i.e., the positive electrode active material nuclei obtained in Examples 1 to 26), Super P as the conductive agent, and PVDF as the binder were uniformly mixed to obtain a positive electrode slurry. The positive electrode slurry was uniformly coated on the aluminum foil of the positive electrode current collector. After drying the aluminum foil at room temperature, it was transferred to an oven at 120 °C and dried for 1 h. Subsequently, through cold pressing and cutting, a positive electrode plate was obtained.

[0152] (2) Manufacture of the negative electrode plates Manufacture of the negative electrode plates of Examples 1 to 29: Carbon nanotubes and sodium alginate were added to deionized water and stirred to form a uniform slurry. The slurry was coated on the negative electrode current collector of aluminum foil, baked, and cut to obtain a "negative electrode free" negative electrode plate. The surface density of the undercoat layer was 20 g / m 2 It was.

[0153] Manufacture of the negative electrode plate of Example 30: Using the negative electrode plates obtained in Examples 1 to 29, they were assembled into a battery cell together with the positive electrode plate and the separator. The assembled battery cell was charged at a constant current of 0.5C to 3.8V, so that sodium metal was pre-deposited on the negative electrode. After the battery was fully charged, the fully charged negative electrode plate was taken out from the glove box and used as the negative electrode plate of this example.

[0154] (3) Manufacture of the separator Manufacture of the separators of Examples 1 to 28 and 30: As the separator, a polyethylene (PE) porous polymer film was adopted, and the thickness was 9 μm.

[0155] Manufacture of the separator of Example 29: After uniformly mixing chloroplatinic acid and aluminum oxide according to a certain ratio, it was calcined in a tubular furnace at 350 °C for 3 hours using 5% H2 / N2, and cooled to room temperature to obtain aluminum oxide supporting the catalyst. After taking the aluminum oxide supporting the catalyst and polyvinylidene fluoride as the binder as a slurry, it was coated on the base film layer (the material is polyethylene), and a first coating was formed after drying.

[0156] The positive electrode plate, separator, and negative electrode plate were laminated in sequence, and the separator was interposed between the positive electrode plate and the negative electrode plate to serve as an insulator, and then wound up to obtain an electrode assembly. The electrode assembly was placed in a case, and the formulated electrolyte was injected and packaged to obtain a sodium metal battery cell.

[0157] [Determination of the type and content of the catalyst] The type and content of the catalyst were measured by inductively coupled plasma atomic emission spectrometer (ICP-AES).

[0158] [Determination of the type and content of the first additive] The type and content of the first additive were determined by gas chromatography and gas chromatography-mass spectrometer.

[0159] [Room temperature cycle performance test] At 25°C and normal pressure (0.1 MPa), the battery was charged at a constant current of 0.5C until the voltage reached 3.8V, and then discharged at a constant current of 1C until the voltage reached 2.0V. This was regarded as one charge-discharge cycle. Taking the capacity of the first discharge as 100%, the charge-discharge cycle was repeated 500 times, and then the test was stopped. The cycle capacity retention rate was recorded, and the room temperature capacity retention rate was used as an evaluation index for the room temperature cycle performance of the battery.

[0160] [High temperature cycle performance test] At 60°C and normal pressure (0.1 MPa), the battery was charged at a constant current of 0.5C until the voltage reached 3.8V, and then discharged at a constant current of 1C until the voltage reached 2.0V. This was regarded as one charge-discharge cycle. Taking the capacity of the first discharge as 100%, the charge-discharge cycle was repeated 500 times, and then the test was stopped. The cycle capacity retention rate was recorded, and the high temperature capacity retention rate was used as an evaluation index for the high temperature cycle performance of the battery.

[0161] [Test of room temperature thickness expansion rate] At room temperature (25 °C), the battery was charged at a constant current of 0.5 C up to 3.8 V. After the battery was fully charged, the initial volume of the battery was tested using the water displacement method. The battery was stored at room temperature for 24 days, and the volume of the battery after storage was tested using the water displacement method. Based on the battery volume tested before storage, the volume expansion rate of the battery was calculated. The volume expansion rate (%) of the battery after storage at room temperature for 24 days = (the volume of the battery measured after storage / the volume of the battery measured before storage) - 1.

[0162] [Test of High Temperature Thickness Expansion Rate] At 60 °C, the battery was charged at a constant current of 0.5 C up to 3.8 V. After the battery was fully charged, the initial volume of the battery was tested using the water displacement method. The battery was placed in an oven at 60 °C and stored for 24 days, then the battery was taken out. It was left standing at room temperature for 60 minutes. Within 60 minutes after cooling to room temperature, the volume of the battery was tested using the water displacement method. Based on the battery volume tested before storage, the volume expansion rate of the battery was calculated. The volume expansion rate (%) of the battery after storage at 60 °C for 24 days = (the volume of the battery measured after storage / the volume of the battery measured before storage) - 1.

[0163]

Table 1-1

Table 1-2

Table 1-3

[0164] The high temperature expansion rate and normal temperature expansion rate of the sodium metal battery cell are related to the hydrogen content in the sodium metal battery cell. The less hydrogen there is in the sodium metal battery cell, the smaller the expansion rate of the sodium metal battery cell.

[0165] As shown in Examples 1 to 7, by reasonably setting the mass ratio of the first additive to the electrolyte, the volume expansion rate of the sodium metal battery cell can be effectively controlled. As shown in Examples 8 to 17, by reasonably setting the content of the catalyst, the volume expansion rate of the sodium metal battery cell can be effectively controlled. As shown in Examples 18 to 21, the volume expansion rate of the sodium metal battery cell can also be reduced by adding a plurality of different types of the first additives. As shown in Examples 22 to 26, the volume expansion rate of the sodium metal battery cell can also be reduced by a plurality of different types of catalysts. As shown in Examples 27 to 29, even if the catalyst is provided at different positions, the volume expansion rate of the sodium metal battery cell can be reduced. As shown in Example 30, the catalyst and the first additive can be applied to a sodium metal battery cell in which the negative electrode is metallic sodium.

[0166] It should be noted that this application is not limited to the above embodiments. The above embodiments are merely examples, and embodiments having substantially the same configuration as the technical idea and exhibiting the same functions and effects within the scope of the technical solution of this application are all included within the technical scope of this application. In addition, without departing from the gist of this application, various modifications that can be conceived by those skilled in the art are added to the embodiments, and other forms constituted by combining some components in the embodiments are also included within the scope of this application.

Claims

1. An electrolytic solution containing a first additive containing an unsaturated group-containing organic compound, A catalyst containing at least one of a transition metal simple substance and its alloy, A sodium metal battery cell containing the same.

2. The sodium metal battery cell according to Claim 1, wherein the catalyst contains at least one of platinum, ruthenium, palladium, rhodium, iridium, nickel, cobalt, copper and its alloy.

3. The sodium metal battery cell according to Claim 1 or 2, wherein the sodium metal battery cell further includes a positive electrode plate, and the catalyst is included in the positive electrode plate.

4. The sodium metal battery cell according to Claim 3, wherein the positive electrode plate includes a positive electrode current collector and a positive electrode film layer on the surface of the positive electrode current collector, and the catalyst is included in the positive electrode film layer.

5. The sodium metal battery cell according to Claim 4, wherein the positive electrode film layer contains a positive electrode active material, the positive electrode active material includes a positive electrode active material core and a coating layer covering the positive electrode active material core, and the catalyst is included in the coating layer.

6. The coating layer is A coating layer main body covering the positive electrode active material core, The sodium metal battery cell according to Claim 5, including the catalyst on the surface of the coating layer main body.

7. The sodium metal battery cell according to Claim 6, wherein the coating layer main body contains at least one of aluminum oxide, silicon oxide, and carbon.

8. The sodium metal battery cell further includes a separator for separating the positive electrode plate and the negative electrode plate in the sodium metal battery, the separator includes a base film layer and a first coating on the surface of the base film layer, and the first coating contains the catalyst. The sodium metal battery cell according to any one of Claims 1 to 7.

9. The sodium metal battery cell according to Claim 8, wherein the first coating contains a functional material, and the functional material includes a functional material main body and a catalyst on the surface of the functional material main body.

10. The sodium metal battery cell according to Claim 9, wherein the functional material main body contains aluminum oxide.

11. The sodium metal battery cell further includes a case for accommodating the electrolytic solution, a second coating is provided on the inner wall of the case, and the second coating contains the catalyst. The sodium metal battery cell according to any one of Claims 1 to 10.

12. The sodium metal battery cell further includes a negative electrode plate, and the negative electrode plate is a negative electrode current collector. The sodium metal battery cell according to any one of claims 1 to 11.

13. The mass ratio of the first additive to the electrolyte is 0.1% to 5%, and optionally 1% to 5%. The sodium metal battery cell according to any one of claims 1 to 12.

14. The first additive includes at least one of phenylacetylene, styrene, phenol, 1,3,5-triphenylacetylene, naphthalene, benzene, N-ethylcarbazole, toluene, monobenzyltoluene, dibenzyltoluene, and cinnamaldehyde. Optionally, the first additive includes at least one of phenol, phenylacetylene, and naphthalene. The sodium metal battery cell according to any one of claims 1 to 13.

15. The content of the catalyst in the sodium metal battery cell is 0.01 μg / mAh to 1000 μg / mAh, and optionally 1 μg / mAh to 500 μg / mAh. The sodium metal battery cell according to any one of claims 1 to 14.

16. Providing an electrode assembly and a case, and accommodating the electrode assembly in the case; Injecting an electrolyte containing a first additive including an unsaturated group-containing organic compound into the case. A method for manufacturing a sodium metal battery cell, wherein a catalyst is provided on an inner wall of the electrode assembly and / or the case, and the catalyst includes at least one of a transition metal single body and its alloy.

17.

18. The first additive includes at least one of platinum, ruthenium, palladium, rhodium, iridium, nickel, cobalt, copper, and their alloys. The method according to claim 16.

19. The mass ratio of the first additive to the electrolyte is 0.1% to 5%, and optionally 1% to 5%. The method according to claim 16 or 17.

20. The first additive includes at least one of phenylacetylene, styrene, phenol, 1,3,5-triphenylacetylene, naphthalene, benzene, N-ethylcarbazole, toluene, monobenzyltoluene, dibenzyltoluene, and cinnamaldehyde. Optionally, the first additive includes at least one of phenol, phenylacetylene, and naphthalene. The method according to any one of claims 16 to 18.

20. The content of the catalyst is 0.01 μg / mAh to 1000 μg / mAh, and selectively 1 μg / mAh to 500 μg / mAh, and the method according to any one of claims 16 to 19.

21. A battery including a sodium metal battery cell according to any one of claims 1 to 15 or a sodium metal battery cell manufactured by the method according to any one of claims 16 to 20.

22. An electrical device including the battery according to claim 21.

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