MIXTURE OF ELECTROCHEMICALLY ACTIVE SUBSTANCES

Abstract

MIXTURE OF ELECTROCHEMICALLY ACTIVE MATERIALS The present invention relates to a mixture of electrochemically active materials for a positive electrode, said mixture comprising: - from 51% to 99% by mass of an active material (MA1) of formula LiNixMnyD2-x-yO4, in which 0.2 ≤ x ≤ 0.6; 0.9 ≤ y ≤ 1.8; x + y ≤ 2; and D is selected from the group consisting of iron, aluminum, copper, titanium and mixtures thereof; and - from 1% to 49% by mass of an active material (MA2) of formula Lix'My'M'z'PO4, in which 0.8 ≤ x' ≤ 1; 0 ≤ y' ≤ 0.5; 0.5 ≤ z' < 1; x' + y' + z' = 2; and M and M' are chosen independently of each other from the group consisting of iron, manganese, nickel, cobalt, and mixtures thereof. Figure for the abbreviation: none

Description

Title of the invention: MIXTURE OF ELECTROCHEMICALLY ACTIVE MATERIALS

[0001] The present invention relates to a mixture of electrochemically active materials for a positive electrode, and its use, for example, in a positive electrode. The present invention therefore also relates to a positive electrode comprising said mixture and electrochemical elements containing it.

[0002] Recently, devices using electricity as an energy source have proliferated. As the application areas of electrically powered devices such as smartphones, cameras, laptops, and electric vehicles expand, interest in electricity storage devices using electrochemical devices is growing, particularly with regard to lithium batteries. In particular, lithium-ion (Li-ion) batteries are widely used as an energy source for all modern consumer electronic devices and especially for electric vehicles. Li-ion cells offer superior performance characteristics compared to most other rechargeable battery systems.Among other things, Li-ion technology offers high energy and power density, a long lifespan, and high reliability, making it suitable for electric vehicles.

[0003] Lithium-ion type electrochemical elements comprising a cathode whose active material is based on a lithium phosphate of at least one transition metal are known in the prior art. A lithium phosphate of at least one transition metal typically has the formula LiMPO4, where M represents at least one transition metal, for example Mn or Fe or Mn associated with Fe. These LMP-type materials have a number of drawbacks. In particular, they do not operate at high voltages and their performance is poorly suited to automobiles. Furthermore, cathodes based on this type of active material exhibit excessive polarization at high C-rates, corresponding to the ratio between the current and the capacity of a battery.

[0004] Lithium-ion type electrochemical elements comprising a cathode whose active material is based on lithium nickel manganese oxide are known in the prior art. Lithium nickel manganese oxide typically has a formula of the type LiNiMnO2. These LNMO-type materials have a number of drawbacks. In particular, cathodes based on this type of active material exhibit strong surface instability due to electrolyte-related degradation.

[0005] To date, active materials of the type NMC (lithiumized nickel, manganese and cobalt oxide), NMx (lithiumized nickel and manganese oxide), LFP (lithiumized iron phosphate) or LMFP (lithiumized iron and manganese phosphate) are used, but which only allow operation at low voltage, i.e. less than 4.35 V, and which therefore require a large number of cells to obtain the targeted power.

[0006] In addition, current solutions with NMC-type active materials implement high quantities of nickel and cobalt, which is increasingly problematic both in terms of cost and ethics.

[0007] One object of the invention is therefore to propose a mixture of electrochemically active materials making it possible to circumvent the aforementioned disadvantages.

[0008] The present invention therefore aims to provide a mixture of electrochemically active materials with a reduced nickel content and a reduced, or even zero, cobalt content, while making it possible to improve the energy density and power of the cells thus obtained thanks to these materials.

[0009] To this end, the present invention relates to a mixture of electrochemically active materials for a positive electrode, said mixture comprising:

[0010] - from 51% to 99% by mass of an active ingredient (AI) of formula LiNixMnvD2 X VC)4, in which:

[0011] . 0.2 < x < 0.6;

[0012] . 0.9 < y < 1.8;

[0013] . x + y < 2 ; and

[0014] . D is chosen from the group consisting of iron, aluminum, copper, titanium and of their mixtures; and

[0015] - from 1% to 49% by mass of an active ingredient (MA2) of formula LixMyM'zP04, in which :

[0016] . 0.8 < x' < 1 ;

[0017] . 0 < y' < 0.5;

[0018] . 0.5 < z' < 1 ;

[0019] . x' + y' + z' = 2 ; and

[0020] . M and M' are chosen independently of each other from the group consisting of the iron, manganese, nickel, cobalt and mixtures thereof.

[0021] Surprisingly, the mixture according to the invention is synergistic and allows and combines active materials exhibiting compatibility of potentials and types and sizes of particles.

[0022] This mixture makes it possible to greatly reduce the required quantity of nickel as well as that of cobalt, while improving the energy density and power of the cells thus obtained thanks to these materials.

[0023] The present invention also improves the efficiency of lithium use compared to NMC-type oxides. Thanks to the high operating voltage, the number of cells required to obtain the same battery power is reduced.

[0024] Thus, the implementation of the mixtures according to the invention makes it possible to use smaller quantities of active materials to achieve the same voltage, compared to conventional active materials. The present invention therefore makes it possible to reduce the quantity of components, electrolyte, and active materials required, and consequently to lower the cost. Furthermore, this saving in space and weight in the pack makes it possible to lighten the vehicle or extend its range (with the same pack volume).

[0025] The active materials of the mixture according to the invention also have the advantage of both being able to operate at high voltage.

[0026] Mixing an LNP type active ingredient with an LNMO type active ingredient allows for a synergistic improvement in capacity, potency and safety compared with each of the active ingredients alone.

[0027] According to one embodiment, the mixture of electrochemically active materials according to the invention comprises 70% to 95% by mass of active material (MAJ and 5% to 30% by mass of active material (MA2).

[0028] According to one embodiment, M and M' are chosen independently of each other from the group consisting of iron, manganese, nickel, and mixtures thereof.

[0029] The present invention relates to a positive electrode for an electrochemical cell, comprising the mixture of electrochemically active materials as defined above.

[0030] According to one embodiment, the positive electrode for the electrochemical cell according to the invention further comprises at least one binder and at least one electronically conductive material.

[0031] The present invention relates to an electrochemical cell comprising a positive electrode as defined above.

[0032] The present invention relates to a wet preparation method for a positive electrode as defined above, comprising the following steps:

[0033] - a step consisting of mixing at least one binder and at least one material electronic conductor with the mixture of electrochemically active materials as defined above, to obtain a suspension; and

[0034] - a step consisting of depositing on at least one face of a current collector, particularly in aluminium, the suspension obtained in the previous step, said suspension having possibly been filtered beforehand, to obtain said positive electrode.

[0035] The present invention relates to a solvent-free, dry method for preparing a positive electrode according to the invention, comprising the following steps:

[0036] - a step consisting of pre-mixing at least one electronically conductive material with the mixture of electrochemically active materials as defined above, to obtain a premix;

[0037] - a step consisting of adding at least one binder to the premix obtained in the step previous, to obtain a final mixture;

[0038] - a step consisting of shaping the final mixture into a film; and

[0039] - a step consisting of depositing on at least one face of a current collector, particularly in aluminium, the film obtained in the previous step, to obtain said positive electrode.

[0040] The present invention also relates to a lithium-ion system comprising:

[0041] - a positive electrode as defined above,

[0042] - a negative electrode,

[0043] - a liquid electrolyte, and

[0044] - a separator.

[0045] The present invention also relates to an all-solid-state battery, comprising:

[0046] - a positive electrode as defined above,

[0047] - a negative electrode, and

[0048] - a solid electrolyte.

[0049] Other features and variations of the mixture of electrochemically active materials according to the invention will become clearer from the description and examples that follow, given by way of illustration and not limitation of the invention.

[0050] In the following text, the expressions "between ... and ...", "from ... to ...", "ranging ... to ..." and "varying from ... to ..." are equivalent and are meant to mean that the limits are included, unless otherwise stated.

[0051] As indicated above, the present invention relates to a mixture of electrochemically active materials for a positive electrode, said mixture comprising:

[0052] - from 51% to 99% by mass of an active ingredient (AI) of formula LiN^MiyDo s vCL, in which:

[0053] . 0.2 < x < 0.6;

[0054] . 0.9 < y < 1.8;

[0055] . x + y < 2 ; and

[0056] . D is chosen from the group consisting of iron, aluminum, copper, titanium and of their mixtures; and

[0057] - from 1% to 49% by mass of an active ingredient (MA2) of formula LiX'MyM'zP04, in which:

[0058] . 0.8 < x' < 1 ;

[0059] . 0 < y' < 0.5;

[0060] . 0.5 < z' < 1 ;

[0061] . x' + y' + z' = 2 ; and

[0062] . M and M' are chosen independently of each other from the group consisting of the iron, manganese, nickel, cobalt and mixtures thereof.

[0063] The expression "electrochemically active material" or "active material" typically refers to materials that are the site of the electrochemical reaction.

[0064] Preferably, the mixture of electrochemically active materials according to the invention consists solely of the active materials (MA1 and (MA2). According to this embodiment, said mixture does not comprise any other electrochemically active materials. According to this embodiment, the sum of the mass content of the active material (MA1) and the mass content of the active material (MA2) is equal to 100%.

[0065] The mixture of the invention can be obtained by mixing the electrochemically active materials MAi and MA2 together according to conventional techniques. Examples include mixing by low-energy planetary milling with beads, or mixing by centrifugation with or without beads, or mechanical mixing.

[0066] Electrochemically active material (MA 2 )

[0067] As indicated above, the mixture of the invention contains an active material (MAJ of type LNMO (lithiumized nickel manganese oxide).

[0068] This active material corresponds to the formula (1) LiNixMnyD2 x yO4 as defined above.

[0069] The mass content of this active material in the mixture of the invention is from 51% to 99% relative to the total mass of said mixture.

[0070] According to one embodiment, the mass content of this active material in the mixture of the invention is from 70% to 95% relative to the total mass of said mixture.

[0071] According to one embodiment, the mass content of this active material in the mixture of the invention is from 65% to 95%, preferably from 65% to 75%, relative to the total mass of said mixture.

[0072] Preferably, in the aforementioned formula (1), x + y < 2.

[0073] According to this embodiment, the electrochemically active material (MAJ) comprises at least one doping element, D, which in particular improves the stability of the active material and consequently of the mixture.

[0074] Examples of doping elements include iron, aluminum, copper or titanium.

[0075] According to one embodiment, the electrochemically active material (MAi) is in the form of particles having a D50 of 1 pm to 15 pm, in particular of 7 pm to 16 pm.

[0076] Electrochemically active material (MA 2 )

[0077] As indicated above, the mixture of the invention contains an active material (MA2) of the LMFP (lithium phosphate) type.

[0078] This active material corresponds to the formula (2) LiX'MyM'zPO4 as defined above.

[0079] The mass content of this active material in the mixture of the invention is from 1% to 49% relative to the total mass of said mixture.

[0080] According to one embodiment, the mass content of this active material in the mixture of the invention is from 5% to 35%, preferably from 20% to 35%, relative to the total mass of said mixture.

[0081] According to one embodiment, the mass content of this active material in the mixture of the invention is from 25% to 35% relative to the total mass of said mixture.

[0082] The electrochemically active material (MA2) comprises at least one dopant element, M', which in particular improves the stability of the active material and consequently of the mixture.

[0083] According to one embodiment, in the aforementioned formula (2), y'=0. According to this embodiment, the electrochemically active material (MA2) comprises a single dopant element, M'.

[0084] According to one embodiment, in the aforementioned formula (2), y' is different from 0. According to this embodiment, the electrochemically active material (MA2) comprises two different dopant elements, M and M', as defined above.

[0085] Examples of doping elements, M and M', include iron, manganese, nickel or cobalt.

[0086] Preferably, M and M' are different from cobalt. Preferably, M and M' are chosen from iron, manganese or nickel.

[0087] According to one embodiment, the electrochemically active material (MA2) is in the form of particles having a D50 of less than 5 pm, preferably less than 1 pm.

[0088] According to one embodiment, the mixture of electrochemically active materials according to the invention comprises 70% to 95% by mass of active material (MAi) and 5% to 30% by mass of active material (MA2).

[0089] According to one embodiment, the mixture of electrochemically active materials according to the invention comprises 65% to 75% by mass of active material (MAJ and 25% to 35% by mass of active material (MA2). Positive electrode

[0090] The present invention also relates to a positive electrode for an electrochemical cell, comprising the mixture of electrochemically active materials as defined above.

[0091] The positive electrode (or cathode) is typically made up of a current collector covered on at least one of its faces by the mixture of electrochemically active materials according to the invention.

[0092] The positive electrode is for example made up of a metal current collector on which is coated the mixture according to the invention and additives such as binder(s), dispersant(s), conductive element(s), etc...

[0093] According to one embodiment, the positive electrode for electrochemical cell as defined above further comprises at least one binder and at least one electronically conductive material.

[0094] The term "binder" means a compound that strengthens the cohesion between the particles of active materials and improves the chemo-mechanical properties of the composition of active materials according to the invention at the current collector.

[0095] The binder may be one or more of the following compounds: polyvinylidene fluoride (PVDF) and its copolymers such as polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP), polytetrafluoroethylene (PTFE) and its copolymers, polyacrylonitrile (PAN), poly(methyl)- or (butyl)methacrylate, polyvinyl chloride (PVC), poly(vinyl formyl), polyester, sequenced polyetheramides, acrylic acid polymers, methacrylic acid, acrylamide, itaconic acid, sulfonic acid, elastomers and cellulosic compounds. The elastomer(s) that can be used as a binder can be chosen from styrene-butadiene (SBR), acrylonitrile butadiene rubber (NBR), hydrogenated acrylonitrile butadiene rubber (HNBR).

[0096] The electronically conductive material is generally selected from graphite, carbon black, acetylene black, soot, graphene, carbon nanotubes, or a mixture thereof. It is used in a small quantity, generally 5% or less relative to the sum of the masses of the mixture of active materials, the binder(s), and the electronically conductive material. Preparation of positive electrode

[0097] The present invention also relates to a method for preparing the positive electrode as defined above.

[0098] The process can be carried out by wet method with solvent or by dry method without solvent.

[0099] The present invention relates in particular to a wet preparation method for a positive electrode as defined above, comprising the following steps:

[0100] - a step consisting of mixing at least one binder, in particular as defined further high, and at least one electronically conductive material, in particular as defined above, with the mixture of electrochemically active materials according to the invention, to obtain a suspension; and

[0101] - a step consisting of depositing on at least one face of a current collector, particularly in aluminium, the suspension obtained in the previous step, said suspension having possibly been filtered beforehand, to obtain said positive electrode.

[0102] According to one embodiment, the mixing step is carried out in the presence of one or more solvent(s). Examples of solvents include N-methylpyrrolidone (NMP), isobutyl isobutyrate (IBIB), or water.

[0103] According to one embodiment, the mixing step consists of mixing 1% to 5% by mass of binder(s), 1% to 5% by mass of electronically conductive material(s), and 80% to 98% by mass of the mixture of electrochemically active materials according to the invention, relative to the total mass of said mixture formed by the binder(s), the electronically conductive material(s) and the active materials.

[0104] The three elements (binders, active materials and conductive materials) can be mixed by planetary dispersion, or using a helical mixer and any other type of mixer used in this field.

[0105] The dispersion (or mud) obtained from this mixture can be filtered before being deposited on an aluminum current collector.

[0106] More generally, an electrode can be manufactured by preparing an ink comprising the mixture of the invention, the binder(s), and generally an electronically conductive material, mixed with a solvent, which is then coated onto the current collector. The ink can be dried in an oven, furnace, and / or infrared to evaporate the solvent.

[0107] The ink is generally deposited on one or both faces of a current collector. This current collector is a current-conducting support, preferably two-dimensional, such as a solid or perforated strip, made of carbon or metal, for example nickel, steel, stainless steel, or aluminum, preferably aluminum. The current collector may also be coated on one or both faces with a layer of carbon.

[0108] The thickness of the ink thus coated can then be adjusted in a calendering step, by passing the electrode between two rollers exerting pressure on the surface of the electrode.

[0109] The present invention therefore also relates to a method for preparing a positive electrode comprising:

[0110] - the preparation of an ink comprising the addition and mixing in a solvent of ingredients mentioned above;

[0111] - the deposition of said ink on the coating of a metal strip as described higher;

[0112] - drying; and

[0113] - calendering.

[0114] As mentioned above, the positive electrode can also be prepared by a dry process, i.e. without solvent.

[0115] The present invention therefore also relates to a solvent-free, dry preparation method for a positive electrode as defined above, comprising the following steps:

[0116] - a step consisting of pre-mixing at least one electronically conductive material with the electrochemically mixed material as defined above, to obtain a premix;

[0117] - a step consisting of adding at least one binder to the premix obtained in the step previous, to obtain a final mixture;

[0118] - a step consisting of shaping the final mixture into a film; and

[0119] - a step consisting of depositing on at least one face of a current collector, particularly in aluminium, the film obtained in the previous step, to obtain said positive electrode.

[0120] According to one embodiment, this process is carried out in the absence of solvent and therefore without the addition of solvent.

[0121] Preferably, this process comprises the sequential addition of the electrochemically active material mixture with the carbon-based additives in a high-shear mixer. The pre-mixing step aims to form a uniform pre-dispersion of the electrochemically active material with the carbon-based additive to ensure good electronic conductivity and good bonding to all the electrochemically active material particles. The next step consists of adding the binder to the previously prepared pre-mixture.

[0122] A first dispersion step is applied to ensure complete and effective dispersion of the binder with the preceding components. Then, if the binder can form fibrils, pre-fibrillation may be applied. This step may be optional or mandatory depending on the nature of the binder.

[0123] Next, the powder can be discharged from the mixer, cooled and ground before being transferred to a film-forming and laminating apparatus (electrospraying, roll-to-roll process, etc.). Electrochemical element

[0124] The present invention also relates to an electrochemical element or an electrochemical cell comprising a positive electrode as defined above.

[0125] Preferably, the electrochemical element comprises at least one positive electrode (cathode) as defined above, one negative electrode (anode), a separator and at least one electrolyte.

[0126] According to one embodiment, said electrode is a positive electrode (cathode) within said element.

[0127] According to one embodiment, the electrochemical element is of the lithium-ion type.

[0128] The lithium-ion element can be manufactured conventionally. At least one cathode, at least one separator, and at least one anode are stacked. The assembly can be wound to form a cylindrical electrochemical bundle. The invention is not limited to the manufacture of cylindrical elements. The element can also be prismatic or pouch-type. The electrodes can also be stacked to form a planar electrochemical bundle. A connecting piece is attached to an edge of the cathode not covered with active material. It is connected to a current output terminal. The anode can be electrically connected to the element container. Conversely, the cathode can be connected to the element container and the anode to a current output terminal. After being inserted into the element container, the electrochemical bundle is impregnated with electrolyte. The element is then hermetically sealed.The element can also be conventionally equipped with a safety valve that causes the element's container to open if the element's internal pressure exceeds a predetermined value.

[0129] The electrolyte may be liquid and comprise a lithium salt dissolved in an organic solvent. This lithium salt can be chosen from lithium perchlorate LiClO4, lithium hexafluorophosphate LiPF6, lithium tetrafluoroborate LiBF4, lithium hexafluoroarsenate LiAsF6, lithium hexafluoroantimonate LiSbF6, lithium trifluoromethanesulfonate LiCF3SO3, lithium bis(fluorosulfonyl)imide Li(FSO2)2N (LiFSI), lithium trifluoromethanesulfonimide LiN(CF3SO2)2 (LiTFSI), lithium trifluoromethanesulfonemethide LiC(CF3SO2)3 (LiTFSM), lithium bisperfluoroethylsulfonimide LiN(C2F5SO2)2 (LiBETI), lithium 4,5-dicyano-2-(trifluoromethyl)imidazolide (LiTDI), lithium bis(oxalatoborate) (LiBOB), lithium difluoro(oxalato)borate (LiDFOB), tris(pentafluoroethyl) lithium trifluorophosphate LiPF3(CF2CF3)3 (LiFAP), lithium difluorophosphate LiPO2F2 and mixtures thereof.

[0130] The electrolyte solvent can be chosen from saturated cyclic carbonates, unsaturated cyclic carbonates, linear carbonates, alkyl esters, ethers, cyclic esters, such as lactones.

[0131] As an alternative, the electrolyte may be solid. This solid electrolyte may be a lithium-ion-conducting compound, chosen, for example, from lithium-ion-conducting oxides and lithium-ion-conducting sulfides. The electrolyte may also be a lithium-ion-conducting polymer, such as polyethylene oxide (PEO), polyphenylene sulfide (PPS), and polycarbonate.

[0132] The electrolyte can also be in the form of a gel obtained by impregnating a polymer with a liquid mixture comprising at least one lithium salt and an organic solvent.

[0133] The separator may consist of a layer of polypropylene (PP), polyethylene (PE), polytetrafluoroethylene (PTFE), polyacrylonitrile (PAN), polyester such as polyethylene terephthalate (PET), poly(butylene) terephthalate (PBT), cellulose, polyimide, glass fibers, or a mixture of layers of different types. The aforementioned polymers may be coated with a ceramic layer and / or polyvinylidene difluoride (PVdF) or poly(vinylidene-hexafluoropropylene fluoride) (PVdF-HFP) or acrylates.

[0134] According to one embodiment, the present invention relates to a lithium-ion system comprising:

[0135] - a positive electrode as defined above,

[0136] - a negative electrode, in particular as defined above,

[0137] - a liquid electrolyte, in particular as defined above, and

[0138] - a separator, in particular as defined above.

[0139] Examples of negative electrodes include graphite (natural, artificial, or a mixture of both) or LTO (Li4Ti50i2). Silicon-based electrodes or electrodes based on a graphite / silicon mixture can also be used.

[0140] As a liquid electrolyte, one or more carbonate solvents (ethylene carbonate EC, dimethyl carbonate DMC, ethyl methyl carbonate EMC, propylene carbonate PC, diethyl carbonate DEC...), fluorinated solvents (fluoroethylene carbonate FEC, trifluoroethyl methyl carbonate F3EMC, 2,2,2-trifluoroethyl acetate F3EA, 1,1,1,3,3,3-hexafluoro-2-methoxypropane HFMP...) with at least one lithium salt (LiPF6, LiFSi, LiTFSi,...) and possibly one or more additives (LiPO2F2, LiDFOB, VC, LiBOB, ...) may be used.

[0141] According to one embodiment, the present invention also relates to an all-solid-state battery, comprising:

[0142] - a positive electrode as defined above,

[0143] - a negative electrode, in particular as defined above, and

[0144] - a solid electrolyte, in particular as defined above.

[0145] Examples of negative electrodes include graphite (natural, artificial, or a mixture of both) or LTO (Li4Ti50i2). Silicon-based electrodes, graphite / silicon mixture electrodes, or lithium metal anodes may also be used.

[0146] Polymers can be used as solid electrolytes. Solid sulfide-based electrolytes can also be used: Li6PS5X (X = Cl, Br, I) Argyrodite; x Li2S-(lx)P2S5 Thio LISICON, Lin s M2 xP1+xS12 or solid oxide-based electrolytes.

Claims

Demands

1. A mixture of electrochemically active materials for a positive electrode, said mixture comprising: - from 51% to 99% by mass of an active material (MAJ) of formula LiNixMnyD2 x yO4, wherein: . 0.2 < x < 0.6; . 0.9 < y < 1.8; . x + y < 2; and . D is selected from the group consisting of iron, aluminum, copper, titanium, and mixtures thereof; and - from 1% to 49% by mass of an active material (MA2) of formula LixMyM'zP04, wherein: . 0.8 < x' < 1; . 0 < y' < 0.5; . 0.5 < z' < 1; . x' + y' + z' = 2; and . M and M' are selected independently of each other from the group consisting of iron, manganese, nickel, cobalt and mixtures thereof.

2. Mixture of electrochemically active materials according to claim 1, comprising from 70% to 95% by mass of active material (MAi) and from 5% to 30% by mass of active material (MA2).

3. Mixture of electrochemically active materials according to claim 1 or 2, wherein M and M' are chosen independently of each other from the group consisting of iron, manganese, nickel, and mixtures thereof.

4. Positive electrode for electrochemical cell, comprising the mixture of electrochemically active materials according to any one of claims 1 to 3.

5. Positive electrode for electrochemical cell according to claim 4, further comprising at least one binder and at least one electronically conductive material.

6. Electrochemical cell comprising a positive electrode according to claim 4 or 5.

7. A wet preparation method for a positive electrode according to claim 4, comprising the following steps: - a step of mixing at least one binder and at least one electronically conductive material with the mixture of electrochemically active materials according to any one of claims 1 to 3, to obtain a suspension; and - a step of depositing on at least one face of a current collector, in particular made of aluminum, the suspension obtained in the previous step, said suspension having possibly been filtered beforehand, to obtain said positive electrode.

8. A solvent-free, dry process for preparing a positive electrode according to claim 4, comprising the following steps: - a step of premixing at least one electronically conductive material with the mixture of electrochemically active materials according to any one of claims 1 to 3, to obtain a premix; - a step of adding at least one binder to the premix obtained in the preceding step, to obtain a final mixture; - a step of shaping the final mixture into a film; and - a step of depositing the film obtained in the preceding step onto at least one face of a current collector, in particular made of aluminum, to obtain said positive electrode.

9. Lithium-ion system comprising: - a positive electrode according to claim 4, - a negative electrode, - a liquid electrolyte, and - a separator.

10. All-solid-state battery, comprising: - a positive electrode according to claim 4, - a negative electrode, and - a solid electrolyte.