DE102019102557A1 - Method of making an electrode - Google Patents

Abstract

The invention relates to a method (100) for producing an electrode (1) comprising the following steps: application (102) of a coating agent (10) in an at least partially liquid state on a carrier material (2), the coating agent (10) being a binder (11), - At least partial hardening (104) of the coating agent (10) to produce electrolyte-conductive structures (13).

Description

The invention relates to a method for producing an electrode, in particular for a battery.

Batteries, such as, for example, lithium-ion batteries, generally have two electrodes which are immersed in an electrolyte, so that energy can be stored in the battery or emitted by the battery via chemical processes or reactions. In order to be able to build the battery as small as possible, it is desirable to achieve a high energy density, which can be influenced, among other things, by the electrode structure. In order to improve the mobility of the battery, it is also desirable that the electrode be as light as possible. From the prior art, such as the EP 2 330 663 A1 it is known to at least partially form the electrode from an active material which is held together by means of a binder. Such active materials can form pores and electrolyte conduction paths within the electrode and thus improve the chemical activity of the electrode.

When producing such electrodes, the active material is often first applied as a paste and then dried. However, it is disadvantageous that the drying process is often very lengthy and accordingly increases the electrode production time. If the drying process is shortened, for example by using technical means to accelerate the drying, the binder can at least partially collect on the surface of the active material. However, this accumulation of the binder can lead to the fact that pores and / or electrolyte conduction paths on the surface become blocked and the performance data of the battery or the electrode deteriorate as a result.

It is an object of the present invention to at least partially overcome the above disadvantages known from the prior art. In particular, it is an object of the present invention to improve a method for producing an electrode in such a way that the production can be carried out more quickly and / or performance parameters of the electrode are improved.

The above object is achieved by a method having the features of claim 1. Further advantages of the invention result from the subclaims, the description and the drawings.

• - Auftragen eines Beschichtungsmittels in zumindest teilweise flüssigem Zustand auf ein Trägermaterial, wobei das Beschichtungsmittel ein Bindemittel aufweist,
• - Zumindest teilweises Aushärten des Beschichtungsmittels zur Erzeugung von elektrolytleitfähigen Strukturen,
• - Entfernen eines Teils des Bindemittels vom Beschichtungsmittel durch einen Reinigungsvorgang zum Freilegen der elektrolytleitfähigen Strukturen.

According to the invention, the method for producing an electrode, in particular for a battery, comprises the following steps:

• Applying a coating agent in an at least partially liquid state to a carrier material, the coating agent having a binder,
• At least partial curing of the coating agent to produce electrolytically conductive structures,
• - Removing part of the binder from the coating agent by a cleaning process to expose the electrolyte-conductive structures.

The electrode is preferably a cathode or an anode for a battery. The battery for which the electrode is preferably configured can preferably be a lithium-ion battery and / or a vehicle battery. The coating agent can preferably comprise an active material for the electrode. The carrier material can in particular be made conductive, so that the carrier material can be used as a current collector of the electrode. A conductivity of the carrier material can in particular compensate for a low conductivity of the coating agent, so that, for example, a coating agent with a low electrical conductivity but a high chemical reactivity can be used. The at least partially liquid state of the coating agent can preferably be understood to mean that the coating agent is present as a paste when it is applied, and can therefore advantageously be distributed over the carrier material. The binder can in particular also be referred to as a binder. Thus, the binder can be designed to hold the coating agent together after the curing of the coating agent and / or to fasten it to the carrier material, in particular with a material bond. In particular, the coating agent in the liquid state can have active material of the electrode, binders, conductive additives and / or further additives, wherein the components of the coating agent can be dissolved in a solvent. When the coating agent cures, the binder preferably acts as an adhesive. The solvent can be removed during curing. The binder can preferably be organic. The at least partial curing can be carried out in such a way that a residual viscosity of the coating composition is retained. Alternatively, the coating agent can be fully cured. The electrolyte-conductive structures can further comprise pores and / or electrolyte conduction paths through which an electrolyte of a battery can penetrate, in particular flow and / or diffuse through. The curing can be carried out under the influence of temperature in order to accelerate this. For example, hot air can be supplied or the like. At least in the hardened The coating agent can preferably contain active material of 50 or more percent by weight, particularly preferably of about 90 percent by weight, a guide additive of 1 or more percent by weight, particularly preferably about 5 percent by weight, binder of 1 or more percent by weight, particularly preferably about 5 percent by weight, and / or others Additives include.

The cleaning process, which removes part of the binder from the coating agent, can, for example, by laser ablation, a mechanical process, such as e.g. Sandblasting or scraping, and / or the like can be carried out. Thus, by integrating the cleaning process, it is possible in a simple manner to carry out the curing of the coating agent to produce electrolyte-conductive structures, in particular independently of the distribution of the binder, since local accumulations of the binder on a surface of the coating agent may be removed by the cleaning process. As a result, the cleaning process also exposes the electrolyte-conductive structures by removing the part of the binder, so that the performance data of the electrode with respect to the electrolyte conductivity are improved or recovered.

Furthermore, it can advantageously be provided in a method according to the invention that the at least partial hardening of the coating agent is carried out over a predetermined period of time, the period of time being dimensioned such that during the at least partial hardening, binder collects on a surface of the coating agent. The time allowed for curing, i.e. the predetermined period of time can thus be dimensioned to be particularly short, so that the method for producing the electrode can be shortened overall. In order to accelerate the hardening, it can be provided that the hardening is carried out under the influence of heat and / or materials are used which dry or harden faster due to a material property. Furthermore, the material can be selected regardless of the influence on the segregation of the binder. The subsequent cleaning process can efficiently remove binder that has collected on the surface. In particular, the removed part of the binding agent is a part of the binding agent that has floated open during curing.

In a method according to the invention, it can advantageously be provided that the cleaning process for exposing the electrolytically conductive structures is carried out using a plasma. Thus, the cleaning process can be a plasma cleaning process. It can be provided that the plasma is used, in particular generated, on a surface of the at least partially hardened coating agent to remove the excess part of the binder, in particular, on the surface of the coating agent. By using the plasma in the cleaning process, the cleaning process can be carried out quickly and effectively, so that no or hardly any binder remains on the surface of the coating agent and the exposure of the electrolytically conductive structures can thus be designed efficiently. In particular, the use of the plasma can further assist and thus accelerate the curing of the coating agent, since the plasma cleaning process is carried out in particular at elevated temperatures. A high temperature of the plasma can also have a positive effect on the distribution of the binder in the coating agent during curing.

Within the scope of the invention it can further be provided that the plasma is used on a surface of the coating agent during the cleaning process, so that a binder accumulated on the surface during the at least partial curing of the coating agent is removed by the cleaning process. Thus, the part of the binder that is removed can be a surface-accumulated part of the binder. As a result, the electrolyte-conductive structures can be exposed in an advantageous manner, and a remaining accumulation of binder on the surface can be counteracted.

• - Erzeugen des Plasmas durch Anlegen einer elektrischen Spannung an ein zumindest teilweise das Beschichtungsmittel umgebendes Fluid, und/oder
• - Polarisieren des Beschichtungsmittels und/oder des Trägermaterials durch Anlegen einer elektrischen Spannung zwischen einem zumindest teilweise das Beschichtungsmittel umgebenden Fluid und dem Beschichtungsmittel und/oder dem Trägermaterial.

Vorzugsweise kann jeweils eine elektrische Spannung an das Fluid selbst und an das Fluid mit dem Beschichtungsmittel und/oder dem Trägermaterial angelegt werden, sodass zum einen das Plasma erzeugt wird und zum anderen das Beschichtungsmittel bzw. das Trägermaterial polarisiert wird. Das Fluid kann das Beschichtungsmittel zumindest teilweise umgeben, d. h. das Fluid kann auf eine Oberfläche des Beschichtungsmittels aufgegeben werden und/oder bereits die Oberfläche des Beschichtungsmittels zumindest teilweise umgeben. Vorzugsweise kann es sich bei dem Fluid um ein Gas handeln. Somit kann in vorteilhafter Weise das Plasma direkt in Oberflächennähe des Beschichtungsmittels erzeugt werden und/oder das Beschichtungsmittel bzw. das Trägermaterial polarisiert werden. Durch das Polarisieren des Beschichtungsmittels und/oder des Trägermaterials kann eine elektrische Anziehung erzeugt werden, sodass Ionen des Plasmas in Richtung des Beschichtungsmittels beschleunigt werden und somit das Entfernen des Bindemittels bewirken. Zusätzlich oder alternativ kann das Plasma entfernt von der Oberfläche erzeugt und anschließend auf die Oberfläche des Beschichtungsmittels beschleunigt werden.Furthermore, in a method according to the invention, it is also conceivable that the method comprises at least one of the following steps:

• Generating the plasma by applying an electrical voltage to an at least partially surrounding fluid, and / or
• - Polarizing the coating agent and / or the carrier material by applying an electrical voltage between a fluid at least partially surrounding the coating agent and the coating agent and / or the carrier material.

In each case, an electrical voltage can preferably be applied to the fluid itself and to the fluid with the coating agent and / or the carrier material, so that on the one hand the plasma is generated and on the other hand the coating agent or the carrier material is polarized. The fluid can at least partially surround the coating agent, ie the fluid can be applied to a surface of the coating agent and / or the surface of the coating agent at least partially surrounded. The fluid can preferably be a gas. The plasma can thus advantageously be generated directly in the vicinity of the surface of the coating agent and / or the coating agent or the carrier material can be polarized. An electrical attraction can be generated by polarizing the coating agent and / or the carrier material, so that ions of the plasma are accelerated in the direction of the coating agent and thus cause the removal of the binder. Additionally or alternatively, the plasma can be generated away from the surface and then accelerated onto the surface of the coating agent.

Within the scope of the invention it can further be provided that the plasma has a sputter plasma and the cleaning process comprises mechanical removal of the binder by the sputter plasma. To carry out the cleaning process using a plasma with mechanical removal of the binder, the coating agent and / or the carrier material can preferably be polarized so that the mechanical removal can be carried out by accelerated ions of the plasma. By using the sputtering plasma, further contaminants can be removed from the coating agent, so that a clean surface is created. In addition, the removal can be controlled in a simple manner or carried out in a short time. The method for producing the electrode can thus be shortened overall.

In a method according to the invention, it can advantageously be provided that the plasma has a reactive plasma and the cleaning process comprises a chemical reaction of the reactive plasma with the binder in order to detach the binder from the coating agent. The reactive plasma can preferably have free radicals, by means of which in particular organic molecules of the coating agent react chemically. The reactive plasma can thus promote a selective cleaning process, so that specific substances, i.e. in the present case, at least the binder from which the coating agent or the surface of the coating agent is removed. It can thus be provided that other substances on the surface of the coating agent are not influenced by the reactive plasma and thus, for example, further components of the coating agent are retained on the surface. In addition, it can be provided that UV radiation is used to at least partially detach the binder from the coating agent.

Within the scope of the invention it can further be provided that the carrier material comprises a metal foil, in particular an aluminum foil and / or a copper foil. The carrier material can thus be provided as a thin, metallic and conductive layer which serves as a carrier for the coating material and at the same time favors the electrical conductivity, so that a current tap at the electrode is advantageously possible. Aluminum and / or copper are also lightweight materials, so that the weight of the electrode can be reduced by using these materials.

Within the scope of the invention it can further be provided that the fluid has oxygen and / or a noble gas. The oxygen can also be added in the process for the cleaning process or can be obtained directly from the atmospheric air. Oxygen is an advantageous element in order to be used as a reactive plasma and to form radical or free ions which can react accordingly with the binder. On the one hand, noble gas can form a protective atmosphere, through which contamination by further reactions, e.g. the air with which plasma can be avoided. Furthermore, the noble gas, for example argon, can advantageously be used for mechanical ablation as sputter plasma. For example, the noble gas can comprise particularly large molecules, which can effectively release binders in the event of a mechanical impact on the surface of the coating agent.

• - Erzeugen eines Unterdruckbereiches, insbesondere eines zumindest teilweisen Vakuums, am Beschichtungsmittel,

insbesondere wobei das Erzeugen des Unterdruckbereiches kontinuierlich oder diskontinuierlich durchgeführt wird. Somit kann der Reinigungsvorgang und/oder das Aushärten unter Unterdruck durchgeführt werden. Dazu kann an einem Teilbereich einer Oberfläche des Beschichtungsmittels und/oder um das gesamte Beschichtungsmittel und/oder das gesamte Trägermaterial der Unterdruckbereich erzeugt werden. Vorzugsweise kann ein zumindest teilweises oder vollständiges Vakuum erzeugt werden, sodass insbesondere gasförmige Zersetzungsprodukte und/oder staubförmiger Abrieb direkt abgesaugt werden können. Dadurch kann das Beschichtungsmittel schnell und effizient vom zu entfernenden Teil des Bindemittels befreit werden.Furthermore, it can be provided in a method according to the invention that the method comprises the following step:

• Generating a vacuum region, in particular an at least partial vacuum, on the coating agent,

in particular, the generation of the vacuum region being carried out continuously or discontinuously. The cleaning process and / or curing can thus be carried out under reduced pressure. For this purpose, the negative pressure region can be generated on a partial area of a surface of the coating agent and / or around the entire coating agent and / or the entire carrier material. An at least partial or complete vacuum can preferably be generated, so that in particular gaseous decomposition products and / or dusty abrasion can be sucked off directly. This enables the coating agent to be quickly and efficiently freed from the part of the binder to be removed.

• - Anmischen des Beschichtungsmittels mit dem Bindemittel.

Vorzugsweise kann dabei das Beschichtungsmittel eine erforderliche Bindemittelmenge aufweisen und beim Anmischen des Beschichtungsmittels eine tatsächliche Bindemittelmenge verwendet werden, die die erforderliche Bindemittelmenge um mindestens eine vorbestimmte Mehrmenge des Bindemittels übersteigt. Somit kann vorgesehen sein, dass mehr Bindemittel beim Anmischen des Beschichtungsmittels verwendet wird, als tatsächlich für ein vorteilhaftes Aushärten benötigt wird. Dabei kann insbesondere die vorbestimmte Mehrmenge derart ausgelegt sein, dass die vorbestimmte Mehrmenge dem entfernten Teil des Bindemittels durch den Reinigungsvorgang entspricht. Vorzugsweise kann die vorbestimmte Mehrmenge des Bindemittels 1 % bis 5 % der erforderlichen Bindemittelmenge betragen. Die vorbestimmte Mehrmenge kann somit insbesondere der Menge des Bindemittels entsprechen, die beim insbesondere beschleunigten Aushärten des Beschichtungsmittels an einer Oberfläche des Beschichtungsmittels aufschwimmt und/oder sich ansammelt. Somit kann in definierter Art und Weise die Bindemittelmenge bereits beim Anmischen des Beschichtungsmittels mit dem Bindemittel auf den Reinigungsvorgang abgestimmt sein.Within the scope of the invention it can further be provided that the method comprises the following step:

• - Mixing the coating agent with the binder.

The coating agent can preferably have a required amount of binder and when mixing the coating agent an actual amount of binder can be used which exceeds the required amount of binder by at least a predetermined additional amount of the binder. It can thus be provided that more binder is used when mixing the coating agent than is actually required for advantageous curing. In particular, the predetermined additional amount can be designed such that the predetermined additional amount corresponds to the removed part of the binder due to the cleaning process. The predetermined additional amount of the binder can preferably be 1% to 5% of the required amount of binder. The predetermined additional amount can thus correspond in particular to the amount of binder which floats and / or accumulates on a surface of the coating agent when the coating agent cures, in particular accelerated. The amount of binder can thus be matched to the cleaning process in a defined manner when the coating agent is mixed with the binder.

• 1 Herstellschritte eines erfindungsgemäßen Verfahrens zum Herstellen einer Elektrode in einem ersten Ausführungsbeispiel,
• 2 das erfindungsgemäße Verfahren zum Herstellen der Elektrode gemäß dem ersten Ausführungsbeispiel in einer weiteren schematischen Darstellung von Verfahrensschritten,
• 3 eine schematische Darstellung von Bindemittelmengen bei dem erfindungsgemäßen Verfahren gemäß dem ersten Ausführungsbeispiel,
• 4 eine schematische Darstellung einer Zeit beim Aushärten bei dem erfindungsgemäßen Verfahren des ersten Ausführungsbeispiels,
• 5 einen Reinigungsvorgang unter Einsatz eines Plasmas bei einem erfindungsgemäßen Verfahren zum Herstellen einer Elektrode gemäß einem weiteren Ausführungsbeispiel,
• 6 einen Reinigungsvorgang unter Einsatz eines Plasmas bei einem erfindungsgemäßen Verfahren zum Herstellen einer Elektrode gemäß einem weiteren Ausführungsbeispiel.

Further measures improving the invention result from the following description of some exemplary embodiments of the invention, which are shown schematically in the figures. All features and / or advantages arising from the claims, the description or the drawings, including constructive details, spatial arrangements and method steps, can be essential to the invention both individually and in the most varied of combinations. It should be noted that the figures are only descriptive and are not intended to limit the invention in any way. Show it:

• 1 Manufacturing steps of a method according to the invention for manufacturing an electrode in a first exemplary embodiment,
• 2nd the inventive method for producing the electrode according to the first embodiment in a further schematic representation of process steps,
• 3rd 2 shows a schematic representation of amounts of binder in the method according to the invention in accordance with the first exemplary embodiment,
• 4th 1 shows a schematic representation of a time during curing in the method according to the invention of the first exemplary embodiment,
• 5 a cleaning process using a plasma in a method according to the invention for producing an electrode according to a further exemplary embodiment,
• 6 a cleaning process using a plasma in a method according to the invention for producing an electrode according to a further embodiment.

In the following figures, the same reference numerals are used for the same technical features of different exemplary embodiments.

In the 1 and 2nd are process steps of a method according to the invention 100 for making an electrode 1 shown schematically. The process includes 100 preferably first mixing 101 a coating agent 10th with a binder 11 . The coating agent 10th can be an active material 12th the electrode 1 include which by the binder 11 is held together. To manufacture the electrode 1 is an application 102 of the coating agent 10th in an at least partially liquid state on a carrier material 2nd intended. The carrier material 2nd can preferably comprise a metal foil, in particular a copper and / or aluminum foil. Thus the carrier material 2nd be designed as a current collector, which has the conductivity of the electrode 1 can improve overall. Furthermore, on the carrier material 2nd Voltage can be tapped when the electrode 1 for example, is installed in a battery. Preferably the electrode 1 for use in a vehicle battery. It can further be provided that the method 100 a generating 103 a negative pressure area 4th on the coating agent 10th , especially on a surface 3rd of the coating agent 10th includes. The vacuum range 4th continuously or discontinuously during the process 100 be generated. The vacuum area 4th , which can be designed in particular as a partial or complete vacuum, can advantageously ensure that loose impurities are suctioned off, with further reactions of the coating agent being effected simultaneously by the negative pressure 10th can be prevented or reduced. The process also includes 100 an at least partial curing 104 of the coating agent 10th for the production of electrolytically conductive structures 13 . When curing, the coating agent 10th preferably the electrolyte-conductive structures 13 form in the form of pores and / or electrolyte conductive paths. This can harden 104 be carried out in such a way that during curing 104 binder 11 on a surface 3rd of the coating agent 10th collects as in 1 shown. During the at least partial curing 104 or simultaneously with the at least partial curing 104 is also a removal 105 part of the binder 11 of the coating agent 10th through a Cleaning process 105.3 to expose the electrolytically conductive structures 13 intended. As in 1 shown, can harden 104 part of the binder 11 on the surface 3rd collect that eventually by removing it 105 of the coating agent 10th is solved. Preferably, the cleaning process 105.3 to expose the electrolytically conductive structures 13 using a plasma 20 be carried out as in the 5 or. 6 shown. By removing 105 of the binder 11 can when curing 104 superficially blocked electrolyte conductive structures 13 be exposed.

Preferably, when mixing 101 of the coating agent 10th be provided that, as in 3rd shown schematically, an actual amount of binder 11.2 the required amount of binder is used 11.1 of the coating agent 10th by at least a predetermined additional quantity 11.3 of the binder 11 exceeds. This can cause a buildup of binders 11 when curing 104 be pre-calculated and therefore advantageous during the cleaning process 105.3 be taken into account.

Consequently, as in 4th shown schematically, a predetermined period of time 30th for curing 104 of the coating agent 11 be provided and the period of time 30th be dimensioned such that during curing 104 binder 11 on the surface 3rd of the coating agent 10th collects. So can an amount of binder 11.4 that are in the area of the surface 3rd of the coating agent 10th when curing 104 accumulates, depend on a time t over which the curing 104 is carried out. This can be due, for example, to the fact that the binder 11 has a lower density than the active material 12th and thus partially floats up. With a longer time t to harden 104 less binder collects 11 in the area of the surface 3rd of the coating agent 10th , ie with increasing time t for curing 104 the amount of binder is reduced 11.4 in the area of the surface 3rd . Through the cleaning process 105.3 however, it is not necessary to do this when determining the time period 30th for curing 104 to take into account as the accumulated part of the binder 11 Will get removed. The specified period of time 30th can for example be designed such that the accumulated amount of binder 11.4 the predetermined excess 11.3 corresponds to that eventually through the cleaning process 105.3 is removed. Thus the procedure 100 for making the electrode 1 can be carried out in a short time and under defined circumstances.

5 also shows removal 105 part of a binder 11 of a coating agent 10th through a cleaning process 105.3 to expose electrolytically conductive structures 13 of the coating agent 10th in a case 100 for making an electrode 1 according to a further embodiment. There is a generation 105.1 of a plasma 20 by applying a voltage to an at least partially the coating agent 10th surrounding fluid 21 intended. This allows the cleaning process 105.3 using the plasma 20 respectively. The plasma 20 preferably has a reactive plasma 20.1 on. The cleaning process 105.3 involves a chemical reaction of the reactive plasma 20.1 with the binder 11 to the binder 11 from the coating agent 10th detach. The fluid preferably has 21 an oxygen and / or the reactive plasma 20.1 Oxygen ions on the reactivity of the reactive plasma 20.1 to be able to guarantee. The cleaning process can 105.3 using the plasma 20 be designed selectively so that, for example, an organic binder 11 with the reactive plasma 20.1 reacts and the reaction products in a negative pressure area 4th can be suctioned off. A voltage source can be used to generate the voltage 5 be provided, whereby the fluid accordingly 21 can be generated.

6 also shows removal 105 part of a binder 11 of a coating agent 10th through a cleaning process 105.3 to expose electrolytically conductive structures 13 in a case 100 for making an electrode 1 according to a further embodiment. The cleaning process includes 105.3 use of a plasma 20 which is a sputtering plasma 20.2 having. The sputtering plasma 20.2 can preferably comprise a noble gas, in particular argon, or noble gas ions, in particular argon ions. A create 105.1 of the sputtering plasma 20.2 can by at least partially applying an electrical voltage to the coating agent 10th surrounding fluid 21 take place, while still polarizing 105.2 of the coating agent 10th and / or the carrier material 2nd by applying an electrical voltage between the at least partially the coating agent 10th surrounding fluid 21 and the coating agent 10th and / or a carrier material 2nd of the coating agent 10th be performed. By polarizing 105.2 can during the cleaning process 105.3 Sputtering plasma ions 20.2 towards the coating agent 10th be accelerated and thus mechanical removal of the binder 11 on a surface 3rd of the coating agent 10th obtain. Preferably for creating 105.1 and polarizing 105.2 each a separate voltage source 5 be provided.

Curing can occur through a plasma cleaning process 104 a coating agent 10th for creating electrolytically conductive structures 13 when making an electrode 1 through a process 100 especially in parallel or before the cleaning process 105.3 be performed. The plasma cleaning process is a stable cleaning process 105.3 enables that can be carried out efficiently.

The above explanation of the embodiments describes the present invention exclusively in the context of examples. Of course, if technically meaningful, individual features of the embodiments can be freely combined with one another without departing from the scope of the present invention.

Reference list

1

electrode

2nd

Backing material

3rd

Surface of 2nd

4th

Vacuum range

5

Voltage source

10th

Coating agent

11

binder

11.1

required amount of binder

11.2

actual amount of binder

11.3

predetermined excess

11.4

Amount of binder in the range of 3rd

12th

Active material

13

Electrolyte conductive structures

20

plasma

20.1

reactive plasma

20.2

Sputtering plasma

21

Fluid

30th

predetermined period of time

100

Procedure

101

Mixing of 10th

102

Applying 10th

103

Generate 4th

104

Curing of 10th

105

Remove part of 11

105.1

Generate 10th

105.2

Polarize

105.3

Cleaning process

t

time

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 2330663 A1 [0002]

Claims (10)

Method (100) for producing an electrode (1) comprising the following steps: - applying (102) a coating agent (10) in an at least partially liquid state to a carrier material (2), the coating agent (10) having a binder (11), - At least partially curing (104) the coating agent (10) to produce electrolytically conductive structures (13), - Removing (105) part of the binder (11) from the coating agent (10) by a cleaning process (105.3) to expose the electrolyte-conductive structures (13). Method (100) according to Claim 1 characterized in that the at least partial curing (104) of the coating agent (10) is carried out over a predetermined period of time (30), the period of time (30) being dimensioned such that during the at least partial curing (104) binder (11 ) collects on a surface (3) of the coating agent (10). Method (100) according to Claim 1 or 2nd , characterized in that the cleaning process (105.3) for exposing the electrolyte-conductive structures (13) is carried out using a plasma (20). Method (100) according to Claim 3 , characterized in that during the cleaning process (105.3) the plasma (20) is used on a surface (3) of the coating agent (10), so that the cleaning process (105.3) causes the coating agent (10) to at least partially harden (104) the surface (3) accumulated binder (11) is removed. Method (100) according to one of the preceding claims, characterized in that the method (100) comprises at least one of the following steps: - Generation (105.1) of the plasma (20) by applying an electrical voltage to an at least partially the coating agent (10) surrounding fluid (21), and / or - polarizing (105.2) the coating agent (10) and / or the carrier material (2) by applying an electrical voltage between an at least partially surrounding the coating agent (10) fluid (21) and the coating agent ( 10) and / or the carrier material (2). Method (100) according to one of the preceding claims, characterized in that the plasma (20) has a sputtering plasma (20.2) and the cleaning process (105.3) comprises mechanical removal of the binder (11) by the sputtering plasma (20.2). Method (100) according to one of the preceding claims, characterized in that the plasma (20) has a reactive plasma (20.1) and the cleaning process (105.3) a chemical reaction of the reactive plasma (20.1) with the binder (11) to remove the Contains binder (11) from the coating agent (10). Method (100) according to one of the preceding claims, characterized in that the carrier material (2) comprises a metal foil, in particular an aluminum foil and / or a copper foil, and / or that the fluid (21) comprises oxygen and / or an inert gas. Method (100) according to one of the preceding claims, characterized in that the method (100) comprises the following step: - Generating (103) a negative pressure region (4), in particular an at least partial vacuum, on the coating agent (10), the generation ( 103) of the vacuum region (4) is carried out continuously or discontinuously. Method (100) according to one of the preceding claims, characterized in that the method (100) comprises the following step: - Mixing (101) the coating agent (10) with the binder (11), the coating agent (10) having a required amount of binder ( 11.1) and when mixing (101) the coating agent (10) an actual amount of binder (11.2) is used which exceeds the required amount of binder (11.1) by at least a predetermined additional amount (11.3) of the binder (11).

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