Battery cell with a specific porous solid electrolyte foam

Abstract

The present invention relates to a battery cell (1) comprising at least one positive electrode (2), at least one negative electrode (3), and at least one separator (4), wherein the positive and negative electrodes (2) comprise a positive porous solid electrolyte polymer foam (5) comprising at least one lithium salt and a positive electrode material (6) disposed within the pores (7) of the positive electrode foam (5), and the negative electrode (3) comprises a negative porous solid electrolyte polymer foam (8) comprising at least one lithium salt and a negative electrode material (9) disposed within the pores (10) of the negative electrode foam (8).

Description

Technical Field

[0001] The present invention relates to the field of all-solid-state batteries. More specifically, the present invention relates to an all-solid-state battery cell comprising at least one positive electrode and at least one negative electrode, each of the two electrodes comprising a porous solid electrolyte polymer foam.

[0002] The present invention also relates to a method for manufacturing such a battery cell.

Background Art

[0003] Conventionally, a battery comprises one or more positive electrodes, one or more negative electrodes, a separator, an anode current collector and a cathode current collector.

[0004] The performance of a battery is determined by ion transport characteristics and electron transport characteristics. In the case of an all-solid-state battery, ion transport at the electrode scale occurs through a network formed by a solid electrolyte (polymer, polymer + lithium salt, inorganic, hybrid polymer + inorganic). When such a battery is placed in an operating state, this network is percolated to form an ion conduction path throughout the volume of the electrode, ensuring the transport of ions to or from the assembly of active material particles.

[0005] Furthermore, a high energy density is required at the cell scale, and a thick electrode with a larger amount of material is needed.

[0006] One of the difficulties encountered is to ensure a good distribution of the solid electrolyte in the electrode mixture. The thicker the electrode, the more difficult it is to achieve the quality of this distribution.

[0007] Furthermore, since the electrolyte is added directly in the process of forming the electrode, the dispersion of components becomes complicated in all-solid-state battery applications. In the positive electrode (referred to as the cathode), the solid electrolyte is called a cathode ion-conducting material. In the negative electrode (referred to as the anode), the solid electrolyte is called an anode ion-conducting material.

[0008] Poor electrolyte distribution leads to reduced available energy and power performance, related to ion transport (supply and collection of ion species) throughout the electrode volume, and also related to charge transfer processes (insertion of ions into / deinsertion of ions from the active materials of the positive and negative electrodes).

[0009] Finally, an electrically insulating ion-conducting separator is placed at the interface between the two electrodes. In the case of solid electrolyte batteries, this is preferably a non-porous membrane. The cathode ion-conducting material / separator and anode ion-conducting material / separator interfaces are considered important. This is because resistance can be observed at these interfaces. The resistance at these interfaces can limit ion transport and consequently the performance of the battery, as well as create mechanically weak zones, which can be fatal for durability.

[0010] Patent EP 2 099 087 describes a method for filling a porous solid electrolyte with a precursor of an electrode active material via an immersion process.

[0011] The electrode active material solution contains a phosphate or oxide derivative dispersed in a solvent. When this structure is immersed and dried at a temperature at which the solvent can evaporate, the material remains in the electrolyte structure. Thus, the porous solid electrolyte consists of oxides or phosphates. According to this method, an all-solid-state cell can be manufactured.

[0012] Patent EP 2 099 087 focuses on a method for filling porous solid electrolyte structures, i.e., the manufacture of a single electrode.

[0013] On the other hand, this patent does not consider the environment of the electrodes after the battery has been assembled. The advantage of such an electrolyte structure is that it ensures percolation of the ion transport network in order to guarantee the three-dimensional distribution of ion species during the charging and discharging processes, and that this is done throughout the entire structure of the battery.

[0014] However, this patent is limited to the scale of an electrode having a charge transfer process, and the distribution of ions within the volume of this same electrode.

[0015] Therefore, patent EP 2 099 087 does not consider the interface between the three-dimensional structure of the electrodes and the separator membrane. If this interface is excessively resistant, it will act as a barrier to the transport of ion species. This interfacial resistance is determined in detail by the materials used as the cathode ion conducting material, the anode ion conducting material, and the separator membrane. The properties of the materials and the assembly process may have an influence on this interface.

[0016] Patent EP 2 099 087 does not mention these species. However, the solution may be effective at the electrode scale, but may not be compatible with a complete battery cell or complete battery.

[0017] Furthermore, as shown above, patent EP 2 099 087 only mentions oxides and phosphates as comparable electrode active materials.

[0018] Furthermore, patent EP 2 099 087 describes a ceramic solid electrolyte. The electrode cited is, in detail, an "LLT" electrode (Li 0 ≤ x ≤ 2 / 3). 3x La 2 / 3-x TiO3) or "LAMP" electrode (where 0≦x≦1 and M is a tetravalent transition metal such as Ge, Ti, Zr, Li 1+x Al x M 2-x (PO4)3) is selected. The electrode may have an aluminum garnet-based structure, or a structure of lithium, lanthanum, zirconium, and oxygen containing a garnet type.

[0019] These various electrodes cited in Patent EP 2 099 087 are not entirely satisfactory, inter alia, because the ion transport network has a solid / solid interface that can exhibit significant resistance. Furthermore, ceramics require much more time-consuming shaping methods than polymer materials.

[0020] Therefore, it is necessary to develop a new battery cell with a solid electrolyte that can overcome the above-mentioned drawbacks.

Summary of the Invention

[0021] It has been found that a battery cell with a specific positive electrode, a specific negative electrode and a separator has no resistance at the interface and, on the other hand, can ensure good ion transport throughout the battery.

[0022] Therefore, the present invention provides a battery cell comprising at least one positive electrode, at least one negative electrode and at least one separator, where the positive electrode is - a positive electrode porous solid electrolyte polymer foam comprising a positive electrode foam containing at least one lithium salt, - a positive electrode material disposed in the pores of the positive electrode foam and the negative electrode is - a negative electrode porous solid electrolyte polymer foam comprising a negative electrode foam containing at least one lithium salt, - a negative electrode material disposed in the pores of the negative electrode foam and

[0023] The present invention further provides a battery comprising at least one battery cell according to the present invention.

[0024] The present invention also relates to a method for manufacturing a battery cell according to the present invention.

[0025] It is specified as a condition that the expression "from... to..." used in this description of the present invention should be understood as including each of the recited limits.

[0026] Also, hereinafter, it is similarly specified as a condition that expressions such as "positive electrode foam" and "positive electrode polymer foam" are equivalent to the expression "positive electrode porous solid electrolyte polymer foam".

[0027] Similarly, hereinafter, expressions such as "negative electrode foam" and "negative electrode polymer foam" are equivalent to the expression "negative electrode porous solid electrolyte polymer foam".

[0028] Furthermore, the term "temperature drying" means heating at a temperature (and atmospheric pressure) higher than the ambient temperature (and thus having a drying function) within the scope of the meaning of the present invention, and more specifically, heating at a temperature higher than 25°C is understood to be what it means.

[0029] As shown above, the battery cell according to the present invention includes at least one positive electrode, at least one negative electrode, and at least one separator.

[0030] The separator is generally a polymer film.

[0031] The assembly formed by the positive electrode, the negative electrode, and the separator is preferably in the form of a unitary structure.

[0032] The term "unitary structure" is understood to mean, within the scope of the meaning of the present invention, a single structure, that is, a structure in which there is no physical interface between the positive electrode / separator or the negative electrode / separator.

[0033] Characterization of such a structure can be carried out by measuring the conductivity / resistivity and by scanning electron microscopy on a fragment of the sample. For example, a unitary structure can be observed when there is no boundary between the three layers. In this case, there is no resistance associated with this interface, and there is also no capacitance phenomenon.

[0034] As shown above, the positive electrode comprises a porous solid electrolyte polymer foam, and the negative electrode comprises a porous solid electrolyte polymer foam.

[0035] It is advantageous that the positive electrode foam and the negative electrode foam are foams with the same chemical properties, that is, it is advantageous that the polymer used in the positive electrode foam and the polymer used in the negative electrode foam belong to the same family of materials.

[0036] The positive electrode foam preferably contains poly(ethylene oxide).

[0037] The cathode foam is advantageous to further contain poly(vinylidene fluoride-co-hexafluoropropylene).

[0038] Preferably, the negative electrode foam contains poly(ethylene oxide).

[0039] According to a particular embodiment, the negative electrode foam further comprises poly(vinylidene fluoride-co-hexafluoropropylene).

[0040] The positive electrode foam and the negative electrode foam are identical, and it is particularly preferable that both contain poly(ethylene oxide).

[0041] More specifically, the positive electrode foam and the negative electrode foam are identical and both contain poly(ethylene oxide) and poly(vinylidene fluoride-co-hexafluoropropylene).

[0042] As shown above, the positive electrode polymer foam and the negative electrode polymer foam each contain at least one lithium salt.

[0043] It is advantageous to select lithium salts from lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium bis(fluorosulfonyl)imide (LiFSI), lithium hexafluorophosphate (LiPF6), and mixtures thereof.

[0044] It is preferable that the lithium salt contained in the positive electrode polymer foam and the lithium salt contained in the negative electrode polymer foam are the same.

[0045] According to a particular embodiment of the present invention, the separator is a polymer membrane containing poly(ethylene oxide).

[0046] The separator is advantageous to further contain a polymer binder selected from poly(vinylidene fluoride-co-hexafluoropropylene).

[0047] The separated material preferably further comprises at least one lithium salt selected from lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium bis(fluorosulfonyl)imide (LiFSI), lithium hexafluorophosphate (LiPF6), and mixtures thereof.

[0048] The positive electrode polymer foam, the negative electrode polymer foam, and the separator are preferably foams with the same chemical properties; that is, the polymer used in the positive electrode polymer foam, the polymer used in the negative electrode polymer foam, and the polymer used in the separator are preferably from the same family of materials.

[0049] The polymer membranes of the positive electrode foam, negative electrode foam, and separator are all preferably composed of poly(ethylene oxide) and poly(vinylidene fluride-co-hexafluoropropylene).

[0050] As shown above, the positive electrode comprises a porous solid electrolyte polymer foam and a positive electrode material disposed within the pores of the positive electrode foam, and the negative electrode comprises a porous solid electrolyte polymer foam and a negative electrode material disposed within the pores of the negative electrode foam.

[0051] Therefore, the foam has a porous structure and acts as a host structure into which the electrode material is incorporated.

[0052] The aforementioned foam has a three-dimensional structure.

[0053] The foam design can be selected according to the intended application or the properties of the electrode active material.

[0054] Therefore, a homogeneous pore distribution, that is, a distribution in which all pores have the same diameter, may be preferred, and it is possible to make the pores larger or smaller depending on the size of the active material.

[0055] For micrometer materials, pores with a diameter greater than 10 μm may be selected. For nanometer materials, pores with a smaller diameter (submicron) may be selected to ensure good connectivity between various elements.

[0056] The distribution of pore sizes within the electrode can also be considered in the same way.

[0057] The first embodiment may be an embodiment in which the pores have the same diameter throughout the entire volume of the electrode, i.e., the entire volume of the positive electrode and the entire volume of the negative electrode.

[0058] A second embodiment may be one in which the pores located on the separator side have a smaller diameter, and the pores located on the current collector side have a larger diameter. In this embodiment, the pores have a diameter that gradually increases from the separator towards the current collector.

[0059] A third embodiment may be one in which the pores located on the current collector side have a smaller diameter, and the pores located on the separator side have a larger diameter. In this embodiment, the pores have a diameter that gradually increases from the current collector towards the separator.

[0060] In the battery cell according to the present invention, the pores are integrally interconnected, thus forming a network that can ensure good ion transport, and this network penetrates the entire volume of the electrode.

[0061] The positive electrode polymer foam or the negative electrode polymer foam preferably has a porosity in the range of 40% to 90%.

[0062] Porosity can be quantified by measuring the physical properties of the sample (thickness measurement and weighting) coupled with the volume density of the material under consideration, either by the specific gravity bottle method or by other methods such as X-ray tomography or focused ion beam scanning electron microscopy tomography.

[0063] It is advantageous for the positive electrode polymer foam or negative electrode polymer foam to have a thickness ranging from 50 micrometers to 1000 micrometers.

[0064] According to certain embodiments, the pore diameter of the positive electrode polymer foam or the negative electrode polymer foam ranges from 10 micrometers to 100 micrometers.

[0065] The negative electrode material preferably contains at least one active material.

[0066] According to certain embodiments, the negative electrode material is selected from graphite, pure silicon, oxides and compounds, and titanates.

[0067] It is advantageous that the negative electrode material further comprises at least one electron-conducting compound.

[0068] According to certain embodiments, the electron-conducting compound is selected from carbon black, acetylene black, carbon nanotubes, graphene, graphite plateslets, and mixtures thereof.

[0069] The positive electrode material preferably contains at least one active material.

[0070] According to certain embodiments, the cathode material is selected from transition metal oxides and phosphates. LiFePO4 is preferred as the material.

[0071] It is advantageous that the cathode material further comprises at least one electron-conducting compound.

[0072] According to certain embodiments, the electron-conducting compound is selected from carbon black, acetylene black, carbon nanotubes, graphene, graphite plateslets, and mixtures thereof.

[0073] According to a particular embodiment, the current collector for the positive electrode is made of aluminum, and the current collector for the negative electrode is made of copper.

[0074] A layer for corrosion protection and electrical resistance reduction may be added to the current collector. This layer consists of at least one polymer binder and at least one electron-conducting compound. The material of this layer is preferably the same as the material used for the electrodes.

[0075] Preferably, the negative electrode has a thickness ranging from 50 micrometers to 1000 micrometers.

[0076] It is advantageous for the negative electrode to have a porosity of less than 20%, preferably less than 10%.

[0077] Prioritizing the negative electrode, the negative electrode active material electrodes of For the total volume (total mass)40% to 75% of the volume (or 50% to 85% of the mass), preferably 50% to 70% of the volume (or 60% to 80% of the mass), more preferably teeth, 55% to 65% of the volume (or 65% to 75% of the mass) in They are prepared.

[0078] To have an advantage, The negative electrode is a negative electrode polymer foam. electrodes of For the total volume (total mass) 20% to 55% of the volume (or 15% to 40% of the mass), preferably 25% to 45% of the volume (or 15% to 30% of the mass), more preferably teeth, 30% to 40% of the volume (or 20% to 30% of the mass) in Prepare ru.

[0079] According to a particular embodiment, the negative electrode is a polymer binder. electrodes of For the total volume (total mass) Volume from 0% to 5% (or mass from 0% to 5%), preferably volume from 1% to 4% (or mass from 1% to 4%), more preferably teeth, 2% to 4% of volume (or 2% to 4% of mass) in They are prepared.

[0080] According to a particular embodiment, the negative electrode is an electron-conducting compound electrodes of For the total volume (total mass) Volume from 0% to 5% (or mass from 0% to 5%), preferably volume from 1% to 4% (or mass from 1% to 4%), more preferably teeth, 2% to 4% of volume (or 2% to 4% of mass) in They are prepared.

[0081] Various embodiments for the negative electrode are also valid for the positive electrode unless otherwise indicated.

[0082] The present invention further provides a battery comprising at least one cell according to the present invention.

[0083] The present invention is a method for manufacturing a battery cell according to the present invention, a) A step of manufacturing a separator, b) A step of producing a first mixture comprising at least one porous agent, at least one polymer, at least one lithium salt and at least one solvent, c) A step of coating the first surface of the separator with the first mixture, the step of coating the first mixture being followed by a step of temperature drying to obtain a first electrode foam which is a negative electrode foam or a positive electrode foam, and forming a single structure together with the separator, d) A step of producing a second mixture comprising at least one porous agent, at least one polymer, at least one lithium salt and at least one solvent, e) A step of coating the second surface of the separator with the second mixture, the step of temperature drying in order to obtain a second electrode foam which is a negative electrode foam if a positive electrode foam was produced in step c), or a positive electrode foam if a negative electrode foam was produced in step c), Steps a) through e) are performed consecutively. f) A step of impregnating a negative electrode foam with a mixture containing a negative electrode material, wherein a step of temperature drying follows the impregnation, g) A step of impregnating a positive electrode foam with a mixture containing positive electrode material, wherein the step of temperature drying follows the impregnation, Step f) is configured to be performed before step g), after step g), or even simultaneously with step g), by impregnating the cathode foam with a mixture containing the cathode material, and then, h) A step of temperature drying the assembly It also provides a method that includes this.

[0084] It is preferable that the first mixture and the second mixture are identical.

[0085] The porous agent is preferably selected from glycerin, isopropanol, dibutyl phthalate, and mixtures thereof.

[0086] The polymer of the first mixture and / or the polymer of the second mixture may include poly(ethylene oxide).

[0087] The first and / or second mixture may further contain poly(vinylidene fluoride-co-hexafluoropropylene).

[0088] It is particularly preferable that the same polymer and the same lithium salt are used in the separator, the first mixture, and the second mixture.

[0089] Preferably, the temperature drying step during steps c) and / or e) is optionally carried out under vacuum at a temperature in the range of 105°C to 135°C, preferably in the range of 110°C to 130°C.

[0090] According to a particular embodiment, during steps f), g), and h), the temperature drying step is carried out at a temperature in the range of 90°C to 110°C.

[0091] According to a particular embodiment, after step h), a current collector for the negative electrode and a current collector for the positive electrode are installed.

[0092] Other advantages and features of the present invention will become more apparent by considering the detailed description given as merely non-limiting examples, with reference to the accompanying drawings. [Brief explanation of the drawing]

[0093] [Figure 1] This is a schematic diagram of an embodiment of a battery cell according to the present invention. [Figure 2]This is a schematic diagram of another embodiment of the battery cell according to the present invention. [Figure 3] This is a schematic diagram of another embodiment of the battery cell according to the present invention. [Figure 4] This is a schematic diagram of a structure comprising a porous polymer foam. [Modes for carrying out the invention]

[0094] Embodiment Figures 1 to 3 below illustrate several embodiments of the battery cell according to the present invention. Figure 4, which shows a structure comprising a positive electrode polymer foam and a negative electrode polymer foam, is also referred to in detail.

[0095] As can be seen from Figure 1, the battery cell 1 according to the present invention comprises a positive electrode 2, a negative electrode 3, and a separator 4.

[0096] The positive electrode 2 comprises a positive electrode porous solid electrolyte polymer foam 5 and a positive electrode material 6, the material 6 being disposed within the pores 7 of the positive electrode foam.

[0097] The negative electrode 3 comprises a negative electrode porous solid electrolyte polymer foam 8 and a negative electrode material 9 disposed within the pores 10 of the negative electrode foam.

[0098] The foam body 5 is connected to the current collector 11, which is an aluminum current collector. The foam body 8 is connected to the current collector 12, which is a copper current collector.

[0099] In Figure 1, pores 7 and 10 have similar diameters throughout the entire volume of the positive electrode and the entire volume of the negative electrode, respectively.

[0100] However, as mentioned above, different pore distributions are possible.

[0101] According to another embodiment shown in Figure 2, the pore distribution is such that pores 7 and 10 located on the current collector side have a smaller diameter, while pores 7 and 10 located on the separator side have a larger diameter. In Figure 2, pores 7 and 10 have a diameter that gradually increases from the current collector towards the separator.

[0102] According to yet another embodiment shown in Figure 3, the pore distribution is such that pores 7 and 10 located on the separator side have a smaller diameter, while pores 7 and 10 located on the current collector side have a larger diameter. In Figure 3, pores 7 and 10 have a diameter that gradually increases from the separator towards the current collector.

[0103] The battery cell 1 according to the present invention can be prepared according to the example of the manufacturing method described below.

[0104] separated body First, the separator 4 is manufactured. The separator 4 is preferably a non-porous polymer membrane 4.

[0105] Poly(ethylene oxide) (PEO), a polymer binder, poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP), and at least one lithium salt (selected from LiTFSI, LiFSI, LiPF6, and mixtures thereof) are dissolved in a solvent selected from dimethylformamide (DMF), acetonitrile, and mixtures thereof.

[0106] The PVdF-HFP content can range from 5% to 50% by mass relative to the mass of PEO.

[0107] The lithium salt content can range from 5% to 20% by mass relative to the PEO.

[0108] The polymer (PEO+PVdF-HFP) / solvent mass ratio is preferably set to 1:4.

[0109] Next, the solution is degassed by magnetic stirring under vacuum.

[0110] Next, the film is coated using a doctor blade or nozzle system. Then, to evaporate the solvent, thermal drying is performed optionally under vacuum at a temperature that can range from 60°C to 130°C.

[0111] Next, the film thickness is reduced by calendering.

[0112] Therefore, a non-porous membrane 4 is preferentially obtained. The non-porous membrane 4 is used as a separator between the two electrodes 2 and 3, and its role is to provide electrical insulation and conduct ions.

[0113] Negative electrode foam or positive electrode foam Next, foam 5 or foam 8 is produced on top of the separator 4 produced in the previous step.

[0114] The porosizing agents described above may be used. These porosizing agents are liquids called non-solvents, and when removed, they leave a network of porosity in the sample. "Star-shaped polymer" PEO is used. This polymer is from the same family of materials as the PEO of the separator membrane 4.

[0115] Therefore, compatibility between layers is promoted, and consequently, ion transport is facilitated.

[0116] A PEO "star-shaped polymer" with a mass content of 40% can be used. This content allows for a porosity of nearly 80%. Next, PVdF-HFP is used. The use of PVdF-HFP enhances mechanical strength.

[0117] PVdF-HFP powder, PEO, and at least one lithium salt (selected from LiTFSI, LiFSI, LiPF6, and mixtures thereof) are dissolved in a mixture of DMF (solvent) and glycerin (non-solvent). Mixing is carried out by magnetic stirring at 80°C for 10 hours. Next, a degassing step is performed by magnetic stirring under vacuum.

[0118] Next, a conventional coating step, performed using a doctor blade or nozzle system, is carried out on the first surface of the separator 4 obtained in the previous step.

[0119] The presence of DMF at the interface between the membrane and the solution allows PVdF-HFP to be redissolved on the surface of membrane 4.

[0120] Next, a 12-hour temperature drying process is carried out at 120°C to evaporate the solvent and non-solvent.

[0121] Next, the structure is fixed, and the first negative electrode electrolyte foam or positive electrode electrolyte foam is formed. Therefore, it may be foam 5 or foam 8.

[0122] Furthermore, the interface between the foam 5 (or 8) and the separator 4 is fused, and therefore no physical interface exists between the foam 5 (or 8) and the separator 4. By measuring the conductivity / resistivity, observation by scanning electron microscopy can be performed on a fragment of the sample. In this case, the presence of a boundary between the two layers is not observed.

[0123] At this stage, a single structure is obtained, formed by the separator and the first negative electrode foam or positive electrode foam (foam 5 or foam 8).

[0124] Negative electrode foam or positive electrode foam Next, a negative electrode polymer foam or a positive electrode polymer foam (foam 5 or foam 8) is manufactured on top of the single structure obtained as a result of the previous step.

[0125] Therefore, if foam 5 was produced in the previous step, foam 8 will be produced. If foam 8 was produced in the previous step, foam 5 will be produced.

[0126] In this step, the entire procedure used in the previous step is repeated, except that the step of coating the second surface of the separator 4 with a second mixture comprising at least one porosizing agent, at least one polymer, at least one lithium salt and at least one solvent is performed.

[0127] Therefore, the assembly formed by the foam 5, foam 8, and separator 4 forms a single integrated structure.

[0128] At this stage, as shown in Figure 4, the pores 7 and 10 of foams 5 and 8 are empty, representing structure 1a.

[0129] In the case of foam 5, the pores 7 and 10 are filled by impregnating it with a mixture containing the positive electrode material, which is material 6. In the case of foam 8, the pores 7 and 10 are filled by impregnating it with a mixture containing the negative electrode material, which is material 9.

[0130] The mixture containing materials 6 and 9 may be in the form of an ink.

[0131] For example, foams 5 and 8 can be immersed in the ink tank. The ink penetrates the pores 7 and 10 of foams 5 and 8.

[0132] Impregnation can also be carried out by coating using a doctor blade or nozzle system.

[0133] This impregnation process is followed by a step of temperature drying, optionally under vacuum, at a temperature in the range of 90°C to 110°C, which dries the mixture and fixes it within the foam.

[0134] Next, current collectors for the negative and positive electrodes are installed in the conventional manner. Thus, in this embodiment, the aluminum current collector 11 is connected to the foam 5, and the copper current collector 12 is connected to the foam 8.

[0135] The anode and cathode current collectors may have a carbon coating, or a carbon coating mixed with PEO / poly(vinylidene fluoride-co-hexafluoropropylene), to improve the interface with the active material and polymer foam.

[0136] Therefore, a battery cell according to the present invention can be obtained.

Claims

1. A battery cell (1) comprising at least one positive electrode (2), at least one negative electrode (3), and at least one separator (4), The positive electrode (2) is A positive electrode porous solid electrolyte polymer foam (5) having a mass in the range of 15% to 40% of the total mass of the positive electrode (2), the positive electrode foam (5) containing at least one lithium salt, The positive electrode material (6) is disposed within the pores (7) of the positive electrode foam (5) and Equipped with, The aforementioned negative electrode (3) A negative electrode porous solid electrolyte polymer foam (8) having a mass in the range of 15% to 40% of the total mass of the negative electrode (3), the negative electrode foam (8) containing at least one lithium salt, The negative electrode material (9) is disposed within the pores (10) of the negative electrode foam (8) and Equipped with, A battery cell (1) characterized in that at least one of the separator (4), the positive electrode foam (5), and the negative electrode foam (8) contains poly(ethylene oxide).

2. The battery cell according to claim 1, characterized in that the positive electrode foam (5) and the negative electrode foam (8) are foams having the same chemical properties.

3. The lithium salt is lithium bis(trifluoromethanesulfonyl)imide, lithium bis(fluorosulfonyl)imide, lithium hexafluorophosphate (LiPF) ６ A battery cell according to claim 1 or 2, characterized by being selected from ) and mixtures thereof.

4. The battery cell according to any one of claims 1 to 3, characterized in that the separator (4) is a polymer film containing poly(ethylene oxide).

5. A battery comprising at least one battery cell (1) according to any one of claims 1 to 4.

6. A method for manufacturing a battery cell (1) comprising at least one positive electrode (2), at least one negative electrode (3), and at least one separator (4), The positive electrode (2) is A cathode porous solid electrolyte polymer foam (5), comprising a cathode foam (5) containing at least one lithium salt, The positive electrode material (6) is disposed within the pores (7) of the positive electrode foam (5) and Equipped with, The aforementioned negative electrode (3) A negative electrode porous solid electrolyte polymer foam (8), comprising a negative electrode foam (8) containing at least one lithium salt, The negative electrode material (9) is disposed within the pores (10) of the negative electrode foam (8) and Equipped with, The aforementioned method, a) A step of manufacturing the separator (4), b) A step of preparing a first mixture comprising at least one porous agent, at least one polymer, at least one lithium salt and at least one solvent, c) A step of coating the first surface of the separator (4) with the first mixture, the step of coating the first mixture being followed by a step of temperature drying to obtain a first electrode foam which is the negative electrode foam (8) or the positive electrode foam (5), and forming a single structure together with the separator (4), d) A step of preparing a second mixture comprising at least one porous agent, at least one polymer, at least one lithium salt and at least one solvent, e) A step of coating the second surface of the separator (4) with the second mixture, the step of temperature drying in order to obtain a second electrode foam which is the negative electrode foam (8) if the positive electrode foam (5) was produced in step c), or the positive electrode foam (5) if the negative electrode foam (8) was produced in step c), Steps a) through e) are performed consecutively. f) A step of impregnating the negative electrode foam (8) with a mixture containing the negative electrode material (9), the step of impregnating the negative electrode foam (8) with a mixture containing the negative electrode material (9), the step of drying at a temperature, g) A step of impregnating the positive electrode foam (5) with a mixture containing the positive electrode material (6), followed by a step of temperature drying, Step f) is configured to be performed before step g), after step g), or simultaneously with step g), by impregnating a mixture containing the positive electrode material (6), and then, h) A step of temperature drying the assembly Methods that include...

7. The method according to 6, characterized in that the first mixture and the second mixture are the same.

8. The method according to 6 or 7, characterized in that the porous agent is selected from glycerin, isopropanol, dibutyl phthalate, and mixtures thereof.

9. The method according to any one of claims 6 to 8, characterized in that the polymer in the first mixture and / or the polymer in the second mixture contains poly(ethylene oxide).

10. The method according to any one of claims 6 to 9, characterized in that, during step c) and / or e), the temperature drying step is carried out under vacuum at a temperature in the range of 105°C to 135°C, for example, in the range of 110°C to 130°C.

11. The method according to any one of claims 6 to 10, characterized in that, during steps f), g), and h), the temperature drying step is carried out at a temperature in the range of 90°C to 110°C.

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