DE102017218716A1 - METHOD FOR PRODUCING AN ELECTROCHEMICAL ENERGY STORAGE DEVICE - Google Patents

Abstract

The invention relates to a method for producing an electrochemical energy storage device, which has a, in particular cylindrical or prismatic, wound electrode configuration, wherein the inner electrode side is changed so that this mechanical stresses better withstand.

Description

The invention relates to a method for producing an electrochemical energy storage device, to an electrode of an electrochemical energy storage device, to a battery having such an electrochemical energy storage device, to a motor vehicle having such an electrochemical energy storage device, and to a portable or stationary device having such an electrochemical energy storage device.

Electrochemical energy storage devices have the ability to convert chemical energy into electrical energy. In particular, this energy conversion is often used in batteries, which can ensure an energy supply around the clock as energy storage. In particular, the principle of electrochemical energy conversion is used in various multimedia devices, such as a smartphone or a laptop, but also in electrified drives for motor vehicles or in so-called power tools.

From the prior art it is known to use electrochemical energy storage devices, which are manufactured by winding superimposed electrode tracks. A distinction is made between cylindrical and prismatic windings, the latter being also referred to as flat windings. Common winding forms for lithium-ion cells are further described in the manual Lithium Ion Batteries, Springer 2013 especially in chapters 9 , explained.

It is an object of the invention to provide an improved method of manufacturing an electrochemical energy storage device, preferably for a motor vehicle. It is also an object of the invention to provide an improved electrode side of an electrochemical energy storage device. In particular, a detachment of the individual layers, in particular the composite electrode from the metallic collector of the energy storage device is to be made more difficult.

Accordingly, it is another object of the invention to provide an improved electrochemical energy storage device, a battery having such an electrochemical energy storage device, and an improved motor vehicle having such an electrochemical energy storage device. In addition, it is a further object of the invention to provide an improved portable or stationary device comprising such an electrochemical energy storage device.

These objects are achieved by a method for manufacturing an electrochemical energy storage device according to claim 1, an electrode for an electrochemical energy storage device according to claim 12, an electrochemical energy storage device according to claim 13, a battery having such an electrochemical energy storage device according to claim 14, a motor vehicle having such an electrochemical An energy storage device according to claim 15 and a portable or stationary device having such an electrochemical energy storage device according to claim 16.

• - Beschichten einer innenliegenden Elektrodenseite, insbesondere einer Kathodenseite, mit einem Aktivmaterial-Anteil von 92,0 bis 94,0 %, einem Leitadditiv-Anteil von 1,5 bis 2,8 % und einem Binder-Anteil von 3,9 bis 6,0 %, vorzugsweise einem Aktivmaterial-Anteil von 92,4 bis 93,6 %, einem Leitadditiv-Anteil von 1,8 bis 2,5 % und einem Binder-Anteil von 4,3 bis 5,6 %, weiter vorzugsweise einem Aktivmaterial-Anteil von 92,8 bis 93,2 %, einem Leitadditiv-Anteil von 2,0 bis 2,2 % und einem Binder-Anteil von 4,7 bis 5,2 %, am bevorzugtesten einem Aktivmaterial-Anteil von 93,0 %, einem Leitadditiv-Anteil von 2,05 % und einem Binder-Anteil von 4,95 %;

wobei der Elektroden-Binder mindestens Polyvinylidenfluorid (PVdF) und/oder Polyvinylidenfluorid-hexafluoropropylen (PVdF-HFP) und/oder Polytetrafluorethylen (PTFE) und/oder Polyethylenoxid (PEO) aufweist.A first aspect of the invention relates to a method for producing an electrochemical energy storage device, which has a, in particular cylindrical or prismatic, wound electrode configuration, comprising the following step:

• Coating an inner electrode side, in particular a cathode side, with an active material content of 92.0 to 94.0%, a Leitadditivanteil of 1.5 to 2.8% and a binder content of 3.9 to 6, 0%, preferably an active material content of 92.4 to 93.6%, a Leitadditiv portion of 1.8 to 2.5% and a binder content of 4.3 to 5.6%, more preferably an active material Content of 92.8 to 93.2%, a conductive additive content of 2.0 to 2.2% and a binder content of 4.7 to 5.2%, most preferably an active material content of 93.0 %, a lead additive share of 2.05% and a binder content of 4.95%;

wherein the electrode binder comprises at least polyvinylidene fluoride (PVdF) and / or polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) and / or polytetrafluoroethylene (PTFE) and / or polyethylene oxide (PEO).

Due to increased mechanical stresses due to compression and elongation of the inner electrode side compared to the outer electrode side in electrochemical energy storage devices in which the electrodes are wound, it may cause interference and / or failure of the electrode coatings such as a lack of adhesion and decontacting since these form due to the permanently prevailing tensile and compressive stresses defects, so that the efficiency of the electrochemical energy storage device is reduced or the electrochemical energy storage device is even broken. Furthermore, these defects result in an increased internal resistance of the electrochemical energy storage device and a lower life expectancy is to be expected.

The inventive coating of the inner electrode side can thus be ensured that the inner electrode side of an electrochemical energy storage device has increased adhesion to a collector, so that a detachment of the coating on the inner electrode side of the collector is reduced, preferably prevented and better adhesion to the collector film persists. Thus, tensile and compressive loads can be better distributed, so that the efficiency of the electrochemical energy storage device is at least substantially constant over its lifetime. Preferably, therefore, the lifetime of the electrochemical energy storage device can be increased and the energy density of the electrochemical energy storage device can be kept at least substantially constant during frequent loading and unloading operations. In particular, in this case the binder content is increased in comparison to a standard distribution of the binder. Furthermore, the loading of the active material is kept constant compared to a standard distribution of the active material. Preferably, therefore, the reliability of the electrochemical energy storage device can be increased or improved. For example, the binder may be a PVdF homopolymer, in particular Solef 5130, HSV900 and / or Kureha KF 1300, or else a co-polymer PVDF-HFP.

A battery according to the invention is an interconnection of at least two similar electrochemical energy storage devices. In particular, a battery can also be understood as an accumulator or a so-called battery.

A cathode in the sense of the invention is understood to mean an electrode on which reduction reactions take place, e.g. positive ions are discharged. Depending on the electrical polarity between the electrodes, a cathode is assigned either a positive pole (+) or a negative pole (-). In the case of voluntary redox reactions, such as discharging batteries, the cathode is the positive electrode. For a redox reaction forced by an applied voltage, such as electrolysis, the cathode side is the negatively polarized electrode side.

An anode in the sense of the invention is understood to mean an electrode which, for example, discharges anions from an electrolyte under electron uptake or generates cations, that is to say oxidation reactions take place. An anode thus corresponds to an electron acceptor or behaves formally as an oxidant. The anode is the counter electrode to the cathode, which gives off electrons and at which reducing processes take place. Anions migrate to the anode and cations to the cathode. The polarity of an anode side can be positive or negative as electrochemical processes occur.

A portable device according to the invention is an electronic device which is adapted to be used in a predetermined application area. Preferably, this is a portable device which can be assigned to at least one device of the following list: smartphone, mobile phone, pager, cordless telephone, tablet, laptop, machine tool, in particular drill, spotlight, in particular Baustrahler, lamp, in particular a flashlight, Razor, wireless headphones.

A stationary device in the sense of the invention is an electronic device that is set up to be used in a predetermined field of application. Preferably, this is a stationary device, which is intended for use for storing electrical energy, such as originating from a solar cell. Further, the stationary device is preferably provided for use for at least a predetermined period of time only at one location to store, for example, self-generated regenerative energy, such as resulting from solar, wind and / or hydro power, in order to use it preferably at night ,

An internal electrode side in the sense of the invention is that side of the electrochemical energy storage device which, during the winding process and also in the wound state, has a smaller radius compared to an outer electrode side. In particular, the electrochemical energy storage device has at least a first electrode, a second electrode and at least two separators, wherein the separators prevent a direct contacting of the first and the second electrode and the electrode has an inner as well as an outer electrode side. During a winding process, these layers comprising first and second electrodes and separators are wound in such a way that the radius of the inner electrode side in the wound-up state is smaller than the radius of the outer electrode side.

A binder or electrode binder according to the invention is an agent which is used to achieve a good cohesion between electrode particles and a sufficient adhesion to the current collector.

• - Beschichten einer innenliegenden Elektrodenseite, insbesondere einer Kathodenseite, mit einem Aktivmaterial-Anteil von 92,0 bis 96,0 %, einem Leitadditiv-Anteil von 3,0 bis 5,0 % und einem Binder-Anteil von 1,0 bis 3,0 %, vorzugsweise einem Aktivmaterial-Anteil von 92,8 bis 95,2 %, einem Leitadditiv-Anteil von 3,4 bis 4,6 % und einem Binder-Anteil von 1,4 bis 2,6 %, weiter vorzugsweise einem Aktivmaterial-Anteil von 93,6 bis 94,4 %, einem Leitadditiv-Anteil von 3,8 bis 4,2 % und einem Binder-Anteil von 1,8 bis 2,2 %, am bevorzugtesten einem Aktivmaterial-Anteil von 94,0 %, einem Leitadditiv-Anteil von 4,0 % und einem Binder-Anteil von 2,0 %;

wobei der Elektroden-Binder ein polymerer Binder ist.A second aspect of the invention relates to a method for producing an electrochemical energy storage device, which comprises a in particular cylindrical or prismatic, wound electrode configuration, comprising the following step:

• Coating an inner electrode side, in particular a cathode side, with an active material content of 92.0 to 96.0%, a Leitadditivanteil of 3.0 to 5.0% and a binder content of 1.0 to 3, 0%, preferably an active material content of 92.8 to 95.2%, a Leitadditivanteil of 3.4 to 4.6% and a binder content of 1.4 to 2.6%, more preferably an active material Content of 93.6 to 94.4%, a Leitadditivanteil of 3.8 to 4.2% and a binder content of 1.8 to 2.2%, most preferably an active material content of 94.0 %, a lead additive share of 4.0% and a binder content of 2.0%;

wherein the electrode binder is a polymeric binder.

By using a polymeric binder in the coating of the inner electrode side can be achieved that the inner electrode side of an electrochemical energy storage device has an increased adhesion to a collector, so that a detachment of the coating on the inner electrode side of the collector is reduced, preferably prevented and an adhesion better stays to the collector foil. Thus, tensile and compressive loads can be better distributed, so that the efficiency of the electrochemical energy storage device is at least substantially constant over its lifetime. Preferably, therefore, the lifetime of the electrochemical energy storage device can be increased and the energy density of the electrochemical energy storage device can be kept at least substantially constant during frequent loading and unloading operations. For example, the binder may have Solef 5140, Kureha KF 9700 or Solef 21216 (PVdF-HFP).

• - Beschichten einer innenliegenden Elektrodenseite, insbesondere einer Kathodenseite, mit einem Aktivmaterial-Anteil von 95,0 bis 96,0 %, einem Leitadditiv-Anteil von 2,0 bis 4,0 % und einem Binder-Anteil von 1,0 bis 2,0 %, vorzugsweise einem Aktivmaterial-Anteil von 95,2 bis 95,8 %, einem Leitadditiv-Anteil von 2,4 bis 3,6 % und einem Binder-Anteil von 1,2 bis 1,8 %, weiter vorzugsweise einem Aktivmaterial-Anteil von 95,4 bis 95,6 %, einem Leitadditiv-Anteil von 2,8 bis 3,2 % und einem Binder-Anteil von 1,4 bis 1,6 %, am bevorzugtesten einem Aktivmaterial-Anteil von 95,5 %, einem Leitadditiv-Anteil von 3,0 % und einem Binder-Anteil von 1,5 %;

wobei der Elektroden-Binder ein polymerer Binder ist.A third aspect of the invention relates to a method for producing an electrochemical energy storage device, which has a, in particular cylindrical or prismatic, wound electrode configuration, comprising the following step:

• Coating an inner electrode side, in particular a cathode side, with an active material content of 95.0 to 96.0%, a Leitadditivanteil of 2.0 to 4.0% and a binder content of 1.0 to 2, 0%, preferably an active material content of 95.2 to 95.8%, a Leitadditivanteil of 2.4 to 3.6% and a binder content of 1.2 to 1.8%, more preferably an active material Content of 95.4 to 95.6%, a conductive additive content of 2.8 to 3.2% and a binder content of 1.4 to 1.6%, most preferably an active material content of 95.5 %, a lead additive content of 3.0% and a binder content of 1.5%;

wherein the electrode binder is a polymeric binder.

By using a polymeric binder and a lower loading of the binder when coating the inner electrode side compared to a standard load can be achieved that the inner electrode of an electrochemical energy storage device has an increased adhesion to a collector, so that a detachment of the coating on the inner electrode side is reduced by the collector, preferably prevented and an adhesion to the collector foil remains better. Thus, tensile and compressive loads can be better distributed, so that the efficiency of the electrochemical energy storage device is at least substantially constant over its lifetime. Preferably, therefore, the lifetime of the electrochemical energy storage device can be increased and the energy density of the electrochemical energy storage device can be kept at least substantially constant during frequent loading and unloading operations. For example, the binder may have Solef 5140 or Kureha KF 9700.

In a preferred embodiment, the conductive additive has a Leitruß or consists of Leitruß, in which the surface is polar modified, preferably by plasma and / or ozone and / or peroxide and / or corona treatment. Preferably, it can thus be achieved that the Leitruß has a higher polarity, so that in turn the inner electrode side of an electrochemical energy storage device has an increased adhesion to a collector, so that a detachment of the coating on the inner electrode side of the collector is reduced, preferably prevented, and thus Tensile and compressive loads can be better distributed, so that the efficiency of the electrochemical energy storage device is at least substantially constant over its lifetime. Preferably, therefore, the lifetime of the electrochemical energy storage device can be increased and the energy density of the electrochemical energy storage device can be kept at least substantially constant during frequent loading and unloading operations.

In a further preferred embodiment, the conductive additive has a Leitgraphit share of 0 to 60%, preferably 20 to 40%, more preferably 25 to 35%, most preferably 30%. Thus, it is preferable to supplement and / or replace the standard conductive carbon black by adding a conductive graphite so that also the internal electrode side of an electrochemical energy storage device has an increased adhesion to a collector, so that a detachment of the coating on the inner electrode side of the collector can be reduced, preferably prevented, and thus tensile and compressive stresses can be better distributed, so that the efficiency the electrochemical energy storage device is at least substantially constant over its lifetime. Preferably, therefore, the lifetime of the electrochemical energy storage device can be increased and the energy density of the electrochemical energy storage device can be kept at least substantially constant during frequent loading and unloading operations.

• - Beschichten einer innenliegenden Elektrodenseite, insbesondere einer Anodenseite, mit einem Aktivmaterial-Anteil von 95,0 bis 97,0 %, einem Leitadditiv-Anteil von 0,5 bis 1,5 %, einem ersten Binder, welcher Styrol-Butadien-Kautschuk aufweist, und einem zweiten Binder, welcher Carboxymethylcellulose aufweist, wobei der erste Binder einen Anteil von 2,0 bis 2,5 % und der zweite Binder einen Anteil von 0,5 bis 1,0 % aufweist, vorzugsweise einem Aktivmaterial-Anteil von 95,5 bis 96,5 %, einem Leitadditiv-Anteil von 0,7 bis 1,3 %, der erste Binder einen Anteil von 2,1 bis 2,4 % und der zweite Binder einen Anteil von 0,6 bis 0,9 % aufweist, weiter vorzugsweise einem Aktivmaterial-Anteil von 95,75 bis 96,25 %, einem Leitadditiv-Anteil von 0,9 bis 1,1 %, der erste Binder einen Anteil von 2,2 bis 2,3 % und der zweite Binder einen Anteil von 0,7 bis 0,8 % aufweist, am bevorzugtesten einem Aktivmaterial-Anteil von 96,0 %, einem Leitadditiv-Anteil von 1,0 %, der erste Binder einen Anteil von 2,25 % und der zweite Binder einen Anteil von 0,75 % aufweist.

A fourth aspect of the invention relates to a method for producing an electrochemical energy storage device, which has a, in particular cylindrical or prismatic, wound electrode configuration, comprising the following step:

• Coating an inner electrode side, in particular an anode side, with an active material content of 95.0 to 97.0%, a Leitadditivanteil of 0.5 to 1.5%, a first binder which comprises styrene-butadiene rubber and a second binder comprising carboxymethylcellulose, wherein the first binder has a content of 2.0 to 2.5% and the second binder has a content of 0.5 to 1.0%, preferably an active material content of 95, 5 to 96.5%, a Leitadditivanteil of 0.7 to 1.3%, the first binder accounted for 2.1 to 2.4% and the second binder a proportion of 0.6 to 0.9% more preferably, an active material content of 95.75 to 96.25%, a conductive additive content of 0.9 to 1.1%, the first binder, a content of 2.2 to 2.3%, and the second binder has a proportion of 0.7 to 0.8%, most preferably an active material content of 96.0%, a Leitadditivanteil of 1.0%, the first binder a proportion of 2.2 5% and the second binder has a share of 0.75%.

It can preferably be achieved with this aqueous binder content that the mechanical film properties, such as elasticity, are increased. In general, it can again be achieved that the inner electrode side of an electrochemical energy storage device has increased adhesion to a collector, so that a detachment of the coating on the inner electrode side from the collector is reduced, preferably prevented, and adhesion to the collector foil remains better. Thus, tensile and compressive loads can be better distributed, so that the efficiency of the electrochemical energy storage device is at least substantially constant over its lifetime. Preferably, therefore, the lifetime of the electrochemical energy storage device can be increased and the energy density of the electrochemical energy storage device can be kept at least substantially constant during frequent loading and unloading operations.

In a preferred embodiment, the binder has an organic content, in particular polyvinylidene fluoride, of from 2.5 to 8.0%, preferably from 3.5 to 7.0%, more preferably from 4.5 to 6.0%, most preferably from 5.25% on. Preferably, it can be achieved hereby that the organic binder content is increased in comparison to a standard proportion of the binder. In general, in turn, it can be achieved that the internal electrode side of an electrochemical energy storage device has increased adhesion to a collector, so that a detachment of the coating on the inner electrode side from the collector can be reduced, preferably prevented, and thus tensile and compressive stresses can be better distributed, so that the efficiency of the electrochemical energy storage device is at least substantially constant over its lifetime. Preferably, therefore, the lifetime of the electrochemical energy storage device can be increased and the energy density of the electrochemical energy storage device can be kept at least substantially constant during frequent loading and unloading operations.

• - Beschichten einer innenliegenden Elektrodenseite, insbesondere einer Anodenseite, mit einem Aktivmaterial-Anteil von 92,0 bis 93,0 %, einem Leitadditiv-Anteil von 1,0 bis 2,0 % und einem Binder-Anteil von 5,0 bis 7,0 %, vorzugsweise einem Aktivmaterial-Anteil von 92,2 bis 92,8 %, einem Leitadditiv-Anteil von 1,2 bis 1,8 % und einem Binder-Anteil von 5,4 bis 6,6 %, weiter vorzugsweise einem Aktivmaterial-Anteil von 92,4 bis 92,6 %, einem Leitadditiv-Anteil von 1,4 bis 1,6 % und einem Binder-Anteil von 5,8 bis 6,2 %, am bevorzugtesten einem Aktivmaterial-Anteil von 92,5 %, einem Leitadditiv-Anteil von 1,5 % und einem Binder-Anteil von 6,0 %;

wobei der Binder Polyvinylidenfluoride-co-hexafluoropropylene oder Carboxymethylcellulose (CMC) und/oder Styrol-Butadien-Kautschuk (SBR) aufweist.A fifth aspect of the invention relates to a method for producing an electrochemical energy storage device, which has a, in particular cylindrical or prismatic, wound electrode configuration, comprising the following step:

• Coating an inner electrode side, in particular an anode side, with an active material proportion of 92.0 to 93.0%, a Leitadditivanteil of 1.0 to 2.0% and a binder content of 5.0 to 7, 0%, preferably an active material content of 92.2 to 92.8%, a Leitadditiv portion of 1.2 to 1.8% and a binder content of 5.4 to 6.6%, more preferably an active material Content of 92.4 to 92.6%, a Leitadditivanteil of 1.4 to 1.6% and a binder content of 5.8 to 6.2%, most preferably an active material content of 92.5 %, a lead additive content of 1.5% and a binder content of 6.0%;

wherein the binder comprises polyvinylidene fluoride-co-hexafluoropropylene or carboxymethyl cellulose (CMC) and / or styrene-butadiene rubber (SBR).

It can preferably be ensured by changing the binder from an organic to an aqueous structure that the viscosity, in particular the viscosity, of the binder is increased, that the inner electrode side of an electrochemical energy storage device has an increased adhesion to a collector, so that a detachment of the coating the inner electrode side of the collector is reduced, preferably prevented and adhesion to the collector foil remains better. Thus, tensile and compressive loads can be better distributed, so that the efficiency of the electrochemical energy storage device is at least substantially constant over its lifetime. Preferably, therefore, the lifetime of the electrochemical energy storage device can be increased and the energy density of the electrochemical energy storage device can be kept at least substantially constant during frequent loading and unloading operations.

• - Beschichten einer innenliegenden Elektrodenseite, insbesondere einer Anodenseite, mit einem Aktivmaterial-Anteil von 95,0 bis 97,0 %, einem Leitadditiv-Anteil von 0,5 bis 3,5 % und einem ersten und einen zweiten Binder, wobei der erste Binder einen Anteil von 1,0 bis 1,5 % und der zweite Binder einen Anteil von 1,5 bis 2,0 % aufweist, vorzugsweise einem Aktivmaterial-Anteil von 95,5 bis 96,5 %, einem Leitadditiv-Anteil von 0,8 bis 1,8 %, der erste Binder einen Anteil von 1,1 bis 1,4 % und der zweite Binder einen Anteil von 1,6 bis 1,9 % aufweist, weiter vorzugsweise einem Aktivmaterial-Anteil von 95,75 bis 96,25 %, einem Leitadditiv-Anteil von 0,85 bis 1,35 %, der erste Binder einen Anteil von 1,2 bis 1,3 % und der zweite Binder einen Anteil von 1,7 bis 1,8 % aufweist, am bevorzugtesten einem Aktivmaterial-Anteil von 96,0 %, einem Leitadditiv-Anteil von 1,0 %, der erste Binder einen Anteil von 1,25 % und der zweite Binder einen Anteil von 1,75 % aufweist;

wobei das Aktivmaterial einen natürlichen Graphit-Anteil von 72 % und einen synthetischen Graphit-Anteil von 24 % aufweist.A sixth aspect of the invention relates to a method for producing an electrochemical energy storage device, which has a, in particular cylindrical or prismatic, wound electrode configuration, comprising the following step:

• - Coating an inner electrode side, in particular an anode side, with an active material content of 95.0 to 97.0%, a Leitadditivanteil of 0.5 to 3.5% and a first and a second binder, wherein the first binder a proportion of 1.0 to 1.5% and the second binder has a content of 1.5 to 2.0%, preferably an active material content of 95.5 to 96.5%, a Leitadditivanteil of 0, 8 to 1.8%, the first binder has a content of 1.1 to 1.4% and the second binder has a content of 1.6 to 1.9%, more preferably an active material content of 95.75 to 96 , 25%, a Leitadditivanteil of 0.85 to 1.35%, the first binder in a proportion of 1.2 to 1.3% and the second binder has a share of 1.7 to 1.8%, am most preferably 96.0% active material content, 1.0% conductive additive content, 1.25% first binder and 1.75% second binder;

wherein the active material has a natural graphite content of 72% and a synthetic graphite content of 24%.

By increasing the proportion of natural graphite within the active material, the internal electrode side of an electrochemical energy storage device can be made to have increased adhesion to a collector so that detachment of the coating on the inside electrode side from the collector is reduced, preferably prevented, and adhesion to the collector foil stays better. Thus, tensile and compressive loads can be better distributed, so that the efficiency of the electrochemical energy storage device is at least substantially constant over its lifetime. Preferably, therefore, the lifetime of the electrochemical energy storage device can be increased and the energy density of the electrochemical energy storage device can be kept at least substantially constant during frequent loading and unloading operations.

• - Wickeln, insbesondere zylindrisches oder prismatisches Wickeln, der beschichteten innenliegenden Elektrodenseite, einer außenliegenden Elektrodenseite und wenigstens zweier Separatoren.

In a preferred embodiment, the method has the following additional step:

• - Winding, in particular cylindrical or prismatic winding, the coated inner electrode side, an outer electrode side and at least two separators.

It should be noted that the method according to the invention is used in particular for the internal electrode side. The coating of the outer electrode side is always carried out according to an active material, Leitadditiv- and binder ratio, which is known in the art for the expert.

In a further preferred embodiment, the electrochemical energy storage device is designed as an alkali metal cell, in particular a lithium metal cell or a lithium ion cell.

Preferably, alkali metals are preferred for electrochemical energy conversion and energy storage because of their chemical properties.

A seventh aspect of the invention relates to an electrode having a, in particular cylindrical or prismatic, wound electrode configuration made according to at least one method of the aforementioned aspects of the invention.

An eighth aspect of the invention relates to an electrochemical energy storage device having a, in particular cylindrical or prismatic, wound electrode configuration made according to at least one method of aspects one to six.

Preferably, by using an electrochemical energy storage device made by a method of aspects one through six, it can be achieved that the internal electrode side of an electrochemical energy storage device has increased adhesion opposite to a collector, so that a detachment of the coating on the inner electrode side of the collector is reduced, preferably prevented and adhesion to the collector foil remains better. Thus, tensile and compressive loads can be better distributed, so that the efficiency of the electrochemical energy storage device is at least substantially constant over its lifetime. Preferably, therefore, the lifetime of the electrochemical energy storage device can be increased and the energy density of the electrochemical energy storage device can be kept at least substantially constant during frequent loading and unloading operations. In particular, in this case the binder content is increased compared to a standard coating. Furthermore, the loading of the active material is kept constant compared to a standard coating of the active material.

A ninth aspect of the invention relates to a battery comprising at least two electrochemical energy storage devices. Preferably, therefore, a combination of a plurality of electrochemical energy storage devices may be provided in a battery, so that in particular applications that have an increased energy demand, the electrochemical energy storage devices according to the invention can use simplified.

A tenth aspect of the invention relates to a motor vehicle, comprising at least one electrochemical energy storage device. The use of the electrochemical energy storage device according to the invention, in particular in the automotive sector, is advantageous because of the constantly changing weather influences such as rain and / or also temperature influences such as heat and cold, since the electrochemical energy storage device is more robust against these weathering and temperature influences.

An eleventh aspect of the invention relates to a portable or stationary device comprising an electrochemical energy storage device. The use of electrochemical energy storage devices in portable devices, particularly communication terminals, is preferable because of the longevity of the electrochemical energy storage devices of the present invention.

The features and advantages described in relation to the first aspect of the invention and its advantageous embodiment also apply to the second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth and eleventh aspect of the invention and its advantageous embodiment and vice versa.

• 1 ein Ausführungsbeispiel einer erfindungsgemäßen elektrochemischen Energiespeichervorrichtung; und
• 2 ein weiteres Ausführungsbeispiel einer erfindungsgemäßen elektrochemischen Energiespeichervorrichtung.

Further features, advantages and possible applications of the invention will become apparent from the following description in conjunction with the figures, in which the same reference numerals for the same or corresponding elements of the invention are used throughout. At least partially schematically show:

• 1 an embodiment of an electrochemical energy storage device according to the invention; and
• 2 a further embodiment of an electrochemical energy storage device according to the invention.

1 shows an embodiment of an electrochemical energy storage device according to the invention 1 , The electrochemical energy storage device 1 is here as a cylindrical winding 5 formed, wherein the cylindrical winding 5 has a layer structure. In particular, a separator 4a the layer which is located innermost. This is followed by a first electrode 2 which is from a second electrode 3 by means of another separator 4b is disconnected.

2 shows an embodiment of an electrochemical energy storage device according to the invention 1 , The electrochemical energy storage device 1 is here as a cylindrical winding 5 formed, wherein the cylindrical winding 5 has a layer structure and exemplarily a plurality of windings of the cylindrical coil 5 are shown in excerpts in cross section. Here, the first and second electrodes 2 . 3 a double-sided layer structure. The first electrode 2 is here as an anode 6 and the second electrode 3 as a cathode 8th trained and by separators 4a . 4b separated from each other. An inner anode side 6a the anode 6 is by means of a copper foil 7 , which is shown in dashed lines, from an outer anode side 6b the anode 6 separated. Further, an inner cathode side 8a the cathode 8th from an external cathode side 8b the cathode 8th by means of an aluminum foil 9 separated, which is also shown in dashed lines. In the wound state, the inner anode side 6a the anode 6 as well as the inside cathode side 8a the cathode 8th always a smaller bending radius than the outer anode side 6b the anode 6 as well as the outer cathode side 8b the cathode 3 on, so that the inner anode side 6a and the inside cathode side 8a are exposed to increased mechanical stress. Due to the coating of the internal electrode side according to the invention can be achieved that this increased mechanical stresses holds better.

LIST OF REFERENCE NUMBERS

1

electrochemical energy storage device

2

first electrode

3

second electrode

4a

first separator

4b

second separator

5

cylindrical winding

6

anode

6a

inside anode side

6b

outer anode side

7

copper foil

8th

cathode

8a

inside cathode side

8b

outer cathode side

9

aluminum foil

Claims (16)

A method of manufacturing an electrochemical energy storage device (1) having a, in particular cylindrical or prismatic, wound electrode configuration, comprising the following step: - Coating an inner electrode side, in particular a cathode side (8a), with an active material content of 92.0 to 94.0%, a Leitadditiv share of 1.5 to 2.8% and a binder content of 3.9 to 6.0%, preferably an active material content of 92.4 to 93.6%, a Leitadditiv portion of 1.8 to 2.5% and a binder content of 4.3 to 5.6%, further Preferably, an active material content of from 92.8 to 93.2%, a Leitadditivanteil of 2.0 to 2.2% and a binder content of 4.7 to 5.2%, most preferably an active material content of 93.0%, a lead additive share of 2.05% and a binder share of 4.95%; wherein the electrode binder comprises at least polyvinylidene fluoride and / or polyvinylidene fluoride-hexafluoropropylene and / or polytetrafluoroethylene and / or polyethylene oxide. A method of manufacturing an electrochemical energy storage device (1) having a, in particular cylindrical or prismatic, wound electrode configuration, comprising the following step: - Coating an inner electrode side, in particular a cathode side (8a), with an active material content of 92.0 to 96.0%, a Leitadditivanteil of 3.0 to 5.0% and a binder content of 1.0 to 3.0%, preferably an active material content of 92.8 to 95.2%, a Leitadditivanteil of 3.4 to 4.6% and a binder content of 1.4 to 2.6%, more preferably an active material content of 93.6 to 94.4%, a Leitadditivanteil of 3.8 to 4.2% and a binder content of 1.8 to 2.2%, most preferably an active material content of 94.0%, a lead additive share of 4.0% and a binder content of 2.0%; wherein the electrode binder is a polymeric binder. A method of manufacturing an electrochemical energy storage device (1) having a, in particular cylindrical or prismatic, wound electrode configuration, comprising the following step: Coating an inner electrode side, in particular a cathode side (8a), with an active material content of 95.0 to 96.0%, a Leitadditivanteil of 2.0 to 4.0% and a binder content of 1.0 to 2.0%, preferably an active material content of 95.2 to 95.8%, a Leitadditivanteil of 2.4 to 3.6% and a binder content of 1.2 to 1.8%, further preferably an active material content of 95.4 to 95.6%, a Leitadditivanteil of 2.8 to 3.2% and a binder content of 1.4 to 1.6%, most preferably an active material content of 95.5%, a lead additive content of 3.0% and a binder content of 1.5%; wherein the electrode binder is a polymeric binder. Method according to at least one of the preceding claims, wherein the conductive additive has a Leitruß or consists of Leitruß, in which the surface is polar modified, preferably by plasma and / or ozone and / or peroxide and / or corona treatment. Method according to at least one of the preceding claims, wherein the conductive additive has a Leitgraphit proportion of 0 to 60%, preferably 20 to 40%, more preferably 25 to 35%, most preferably 30%. A method for producing an electrochemical energy storage device (1), which has a, in particular cylindrical or prismatic, wound electrode configuration, comprising the following step: - coating an inner electrode side, in particular an anode side (6a), with an active material content of 95.0 to 97.0%, a conductive additive content of 0.5 to 1.5%, a first binder comprising styrene-butadiene rubber, and a second binder comprising carboxymethylcellulose, the first binder having a content of 2, 0 to 2.5% and the second binder has a proportion of 0.5 to 1.0%, preferably an active material content of 95.5 to 96.5%, a Leitadditivanteil of 0.7 to 1.3%, the first binder a proportion of 2.1 to 2.4% and the second binder a proportion of 0.6 to 0.9%, more preferably an active material content of 95.75 to 96.25%, a Leitadditivanteil of 0.9 to 1.1%, the first binder a proportion of 2.2 to 2.3% and the second binder has a proportion of 0.7 to 0.8%, most preferably an active material content of 96.0%, a Leitadditivanteil of 1.0%, the first binder a share of 2 , 25% and the second binder has a share of 0.75%. Method according to Claim 6 wherein the binder has an organic content, in particular polyvinylidene fluoride, of from 2.5 to 8.0%, preferably from 3.5 to 7.0%, more preferably from 4.5 to 6.0%, most preferably from 5.25 % having. A method of manufacturing an electrochemical energy storage device (1) having a, in particular cylindrical or prismatic, wound electrode configuration, comprising the following step: - Coating of an inner electrode side, in particular an anode side (6a), with an active material content of 92.0 to 93.0%, a Leitadditivanteil of 1.0 to 2.0% and a binder content of 5.0 to 7.0%, preferably an active material content of 92.2 to 92.8%, a Leitadditiv content of 1.2 to 1.8% and a binder content of 5.4 to 6.6%, further Preferably, an active material content of 92.4 to 92.6%, a Leitadditivanteil of 1.4 to 1.6% and a binder content of 5.8 to 6.2%, most preferably an active material content of 92.5%, a lead additive content of 1.5% and a binder content of 6.0%; wherein the binder comprises polyvinylidene fluoride-co-hexafluoropropylene or carboxymethyl cellulose and / or styrene-butadiene rubber. A method of manufacturing an electrochemical energy storage device (1) having a, in particular cylindrical or prismatic, wound electrode configuration, comprising the following step: - Coating an inner electrode side, in particular an anode side (6a), with an active material content of 95.0 to 97.0%, a Leitadditivanteil of 0.5 to 3.5% and a first and a second binder, wherein the first binder has a content of 1.0 to 1.5% and the second binder has a content of 1.5 to 2.0%, preferably an active material content of 95.5 to 96.5%, a Leitadditivanteil from 0.8 to 1.8%, the first binder has a content of 1.1 to 1.4% and the second binder has a content of 1.6 to 1.9%, more preferably an active material content of 95, 75 to 96.25%, a Leitadditivanteil of 0.85 to 1.35%, the first binder a share of 1.2 to 1.3% and the second binder a share of 1.7 to 1.8% most preferably having an active material content of 96.0%, a conductive additive content of 1.0%, the first binder having a content of 1.25% and the second binder having a content of 1.75%; wherein the active material has a natural graphite content of 72% and a synthetic graphite content of 24%. Method according to at least one of the preceding claims, comprising the following additional step: Winding, in particular cylindrical or prismatic winding, the coated inner electrode side (6a, 8a), an outer electrode side (6b, 8b) and at least two separators (4a, 4b). Method according to at least one of the preceding claims, wherein the electrochemical energy storage device (1) as an alkali metal cell, in particular a lithium metal cell or a lithium-ion cell is formed. Electrode (2; 3), which in particular is wound cylindrical or prismatic, produced according to at least one method of Claims 1 to 11 , Electrochemical energy storage device (1) having a, in particular cylindrical or prismatic, wound electrode configuration produced according to at least one method of Claims 1 to 11 , Battery comprising at least two electrochemical energy storage devices (1) Claim 13 , Motor vehicle, comprising at least one electrochemical energy storage device (1) according to Claim 13 , A portable or stationary device comprising at least one electrochemical energy storage device (1) Claim 13 ,

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