Method for producing an electrode winding for a round cell

Abstract

The invention relates to a method for producing an electrode winding for a round cell, to an electrode winding that can be produced by said method, and to a round cell comprising the electrode winding.

Description

[0001] Method for manufacturing an electrode winding for a cylindrical cell

[0002] The present invention relates to a method for producing an electrode winding for a cylindrical cell, an electrode winding producible by the method, and a cylindrical cell comprising the electrode winding.

[0003] An energy storage device, such as a lithium-ion or sodium-ion battery, typically comprises an anode, a cathode, a separator between the anode and cathode, and an electrolyte solution. In the production of cylindrical cells, metallic current collector foils, for example made of copper and / or aluminum, are often coated with electrochemically active anode material or electrochemically active cathode material using a roll-to-roll process. The desired storage capacity of a battery cell can be adjusted during the coating process by appropriately selecting the loading of the current collector layers with electrochemically active anode material or electrochemically active cathode material, or by appropriately selecting the coating thickness.The coated current collector foils then undergo further processing steps, such as drying, compaction (calendering), and cutting, to form corresponding strips. To produce an electrode roll (also known as a "jelly roll"), for example, a separator strip, an anode strip, another separator strip, and a cathode strip can be layered on top of each other, wound around a core, and then inserted into a cylindrical housing, usually made of metal. To achieve the highest possible volumetric energy density of the storage cell, the aim is typically to utilize the cylindrical housing as completely as possible. For this purpose, the lengths of the anode, cathode, and separator strips are designed so that, after winding, the diameter of the resulting electrode roll is only slightly smaller than the inner diameter of the cylindrical housing.

[0004] In lithium-ion and sodium-ion energy storage cells, the electrochemically active anode material expands in volume during charging due to the intercalation of lithium or sodium, respectively. More recently, some storage cells have been using silicon-based electrochemically active anode material because it exhibits a significantly higher gravimetric and volumetric capacitance compared to graphite-based electrochemically active anode material. However, silicon exhibits a considerably larger volume change than graphite during lithium or sodium intercalation during charging. Depending on the cell design, this can lead to substantial changes in the volume or diameter of the electrode windings in some designs. The resulting mechanical stress can cause mechanical aging and, in some cases, unexpected cell failure, i.e., complete energy storage system failure.The inventors have determined that manufacturing-related variations in thickness or charge of the anode and / or cathode strip can be partly responsible for this. For example, a positive thickness deviation or positive charge deviation of the anode and / or cathode strip after winding can result in an electrode winding whose diameter is larger than the theoretically calculated target diameter. Since lithium-ion and sodium-ion storage cells are typically housed in a rigid casing, the further increase in diameter of such an electrode winding during the charging process can lead to repeated mechanical stress and associated undesirable mechanical aging.Conversely, a negative thickness deviation or negative loading deviation in the anode strip and / or the cathode strip after winding can result in an electrode winding whose diameter is smaller compared to the theoretically calculated target diameter. This leads, firstly, to a lower capacitance. Secondly, it can cause the coated current collector foils to tear if the electrode winding has too much room to expand due to the reduced diameter.

[0005] The object of the present invention is to provide a method for producing an electrode winding for a cylindrical cell which can reduce or prevent the risk of excessive expansion of the electrode winding during charging, particularly when using electrochemically active silicon-based anode material.

[0006] One aspect of the invention provides a method for manufacturing an electrode winding for a cylindrical cell, wherein the electrode winding comprises at least one anode band, at least one cathode band, and at least one separator band. The method comprises the following steps:

[0007] (i) Defining target parameters to achieve a target capacitance Q of the electrode winding, wherein the target parameters include:

[0008] (a) Target length of the cathode band Lxathode-ziei,

[0009] (b) Target thickness of the cathode band dxathode-ziei,

[0010] (c) target length of the anode strip LAnode-ziei,

[0011] (d) target thickness of the anode band dAnode-ziei, and (e) target length of the separator band dse P arator-ziei,

[0012] (ii) Providing a large number of anode rollers and cathode rollers,

[0013] (iii) Determining an effective thickness dAnode-eff of the anode rolls and calculating the deviation Ad AnO de, whereby Ad AnO de = d An ode-eff- d AnO de-ziei, and determination of an effective thickness dcathode-eff of the cathode rollers and calculation of the deviation Ad| <athode, WObei Ad|<athode — dCathode-eff dCathode-target,

[0014] (iv) Selecting an anode roll from the plurality of anode rolls and selecting a cathode roll from the plurality of cathode rolls to obtain a matching pair of selected anode roll and selected cathode roll, wherein the amount of the difference of Ad AnO the thickness of the selected anode roll and the adcathode of the selected cathode roll is 1 pm or less, preferably 0.5 pm or less,

[0015] (v) Calculating a fitted length of a cathode band LKathode-ada P , an adapted length of an anode strip L AnO de-ada Pand an adapted length of a separator band Ls ep arator-ada P , where the target capacitance Q of the electrode winding is kept constant,

[0016] (vi) Cutting the selected anode roll at L An ode-ada P , Cutting of the selected cathode roll at LKathode-ada P and providing and cutting a separator roll at Ls ep arator-ada P to obtain multiple anode bands, multiple cathode bands and multiple separator bands;

[0017] (vii) Layering a separator strip, an anode strip, a separator strip and a cathode strip on top of each other and winding the layered strips to obtain an electrode coil.

[0018] Another aspect of the invention provides a method for manufacturing an electrode winding for a cylindrical cell, wherein the electrode winding comprises at least one anode band, at least one cathode band, and at least one separator band. The method comprises the following steps:

[0019] (i) Defining target parameters to achieve a target capacitance Q of the electrode winding, wherein the target parameters include:

[0020] (a) Target length of the cathode band LKathode-ziei,

[0021] (b) Target loading of the cathode band B Cathode-side,

[0022] (c) Target length of the anode band L AnO de-ziei,

[0023] (d) Target loading of anode strip B AnO de-ziei, and (e) target length of the separator band dse P arator-ziei,

[0024] (ii) Providing a large number of anode rollers and cathode rollers,

[0025] (iii) Determination of an effective loading BAnode-eff of the anode rollers and calculation of the percentage deviation ABAnode, and determination of an effective loading BKathode-eff of the cathode rollers and calculation of the deviation ABKathode, wherein

[0026] AB anode — (BAnode-eff BAnode-Target) / BAnode-Target ' 100 and ABCathode — (Bcathode - effective Bcathode - target) / Bcathode - target * 100

[0027] (iv) Selection of an anode roll from the plurality of anode rolls and selection of a cathode roll from the plurality of cathode rolls to obtain a matching pair of selected anode roll and selected cathode roll, wherein the amount of the difference ABanode - ABcathode of the selected anode roll and the selected cathode roll is 0.25% or less, preferably 0.1% or less,

[0028] (v) Calculation of an adapted length of a cathode band LKathode-ada P, an adapted length of an anode strip LAnode-ada P and an adapted length of a separator band Ls ep arator-ada P , where the target capacitance Q of the electrode winding is kept constant,

[0029] (vi) Cutting the selected anode roll at LAnode-ada P , Cutting of the selected cathode roll at LKathode-ada P and providing and cutting a separator roll at Ls ep arator-ada P to obtain multiple anode bands, multiple cathode bands and multiple separator bands;

[0030] (vii) Layering a separator strip, an anode strip, a separator strip and a cathode strip on top of each other and winding the layered strips to obtain an electrode coil.

[0031] The inventors have found that, by selecting a matching pair of anode and cathode coils according to the invention, based on determining the thickness or loading deviation of the respective anode and cathode bands, and by adjusting the lengths of the anode and cathode bands according to the invention, the risk of excessive expansion of the electrode winding during charging can be reduced or prevented. This is particularly evident when using electrochemically active silicon-based anode material. The electrode winding comprises at least one anode band, at least one cathode band, and at least one separator band. Typically, the electrode winding includes at least two separator bands. The anode band, the cathode band, and the separator band(s) are formed in a foil-like manner.Both the anode and cathode strips often feature a current collector foil onto which corresponding electrochemically active electrode materials are applied. Typically, a separator strip, an anode strip, a separator strip, and a cathode strip are wound together to form an electrode coil. Such an electrode coil is often referred to as a "jelly roll." Starting from a core, an electrode coil contains an increasing number of turns towards the end. The number of turns depends on the type of cylindrical cell and the chosen design. Typically, there are between 25 and 100 turns in an electrode coil.

[0032] The capacitance of an electrode winding depends primarily on the amount of electrochemically active electrode material it contains. This, in turn, depends on the length of the anode / cathode band and on the amount of electrochemically active electrode material per unit area of ​​the anode / cathode band. The amount of electrochemically active electrode material per unit area of ​​the anode / cathode band is often referred to as the loading and is usually expressed in g / m². 2 or in mg / mm 2 specified. An alternative measure for the amount of electrochemically active electrode materials contained in the anode band or cathode band, relative to the unit area of ​​the anode band / cathode band, is the thickness of the anode band / cathode band.

[0033] In step (i) of the methods according to the invention, target parameters are defined that are necessary to achieve a desired target capacity Q of the electrode winding. Defining these target parameters is often also referred to as "design," "parameterization," "battery design," or simply "design." Defining the target parameters for achieving a desired target capacity Q of the electrode winding is usually based on a computer simulation. In practice, suitable models of electrode windings, empirically determined, can serve as the basis for the computer simulation, allowing relevant properties to be reproduced with sufficient accuracy.

[0034] Using the models and a computer simulation, the corresponding target parameters (a) target length of the cathode band Lxathode-ziei, and (b) target thickness of the cathode band dxathode-ziei, (c) target length of the anode band LAnode-ziei, (d) target thickness of the anode band dAnode-ziei, and (e) target length of the separator band ds can be determined for a desired target capacitance Q of an electrode winding. ep arator-ziei, can be defined.

[0035] Alternatively, using the models and a computer simulation for a desired target capacitance Q of an electrode winding, the corresponding target parameters (a) target length of the cathode band LKathode-ziei, (b) target loading of the cathode band Bcathode-ziei, (c) target length of the anode band l_Anode-ziei, (d) target loading of the anode band BAnode-ziei, and (e) target length of the separator band dse can also be determined. P arator-ziei, can be defined.

[0036] The anode strip is typically longer than the cathode strip by a fixed offset value x. Similarly, the separator strip is usually longer than the anode strip by a fixed offset value y. The offset values ​​x and y depend on the type of cylindrical cell and the chosen design and can be freely selected over a wide range. Suitable offset values ​​x and y, for example, range from 1 mm to 4 mm.

[0037] In step (ii) of the methods according to the invention, a plurality of anode rolls and cathode rolls are provided. In practice, a plurality, for example several hundred or several thousand, of anode rolls and cathode rolls are usually produced, taking into account the corresponding target parameters.

[0038] In one embodiment of the methods according to the invention, in step (iii) an effective thickness dAnode-eff is determined for a plurality of anode rolls, and a resulting thickness deviation AdAnode of the respective anode roll from the defined target value is calculated according to AdAnode = dAnode-eff - dAnode-ziei. Likewise, an effective thickness dKathode-eff is determined for a plurality of cathode rolls, and a resulting thickness deviation AdKathode of the respective cathode roll from the defined target value is calculated according to Ad| <athode — dCathode-eff dCathode-target calculated.

[0039] The determination of the effective thickness dAnode-eff of the anode rolls and the effective thickness dKathode-eff of the cathode rolls can be carried out, for example, by means of laser triangulation via a traversing measurement along the individual anode rolls or cathode rolls.

[0040] In this embodiment, step (iv) involves selecting an anode roll from the plurality of anode rolls and a matching cathode roll from the plurality of cathode rolls. The matching pair of anode and cathode rolls is selected such that the thickness deviation AdAnode of the selected anode roll and the thickness deviation AdCathode of the selected cathode roll differ as little as possible. The magnitude of the difference AdAnode - dCathode is 1 pm or less, preferably 0.5 pm or less.

[0041] In an alternative embodiment of the methods according to the invention, in step (iii) an effective loading BAnode-eff is determined for a plurality of anode rolls and a resulting percentage deviation of the respective anode roll ABAnode of the respective anode roll from the defined target value is calculated according to:

[0042] AB anode — (BAnode-eff BAnode-Target) / BAnode-Target k100

[0043] Similarly, for a large number of cathode rolls, an effective loading Bcathode-eff is determined and a resulting percentage deviation ABcathode of the respective cathode roll from the defined target value is calculated according to:

[0044] AB Cathode — (Bcathode-eff Bcathode-target) / Bcathode-target * 100.

[0045] In this embodiment, step (iv) involves selecting an anode roll from the plurality of anode rolls and a matching cathode roll from the plurality of cathode rolls. The matching pair of anode rolls and cathode rolls is selected such that the percentage deviation ABAnode of the selected anode roll and the percentage deviation ABCathode of the selected cathode roll differ as little as possible. The magnitude of the ABAnode - ABCathode difference is 0.25% or less, preferably 0.1% or less.

[0046] The following description of further steps (v) to (viii) of the methods according to the invention relates equally to both embodiments described above, i.e. regardless of whether the selection of the matching pair from selected anode roll and selected cathode roll is based on the determination of effective thicknesses or on the determination of effective loadings.

[0047] In step (v) of the inventive method, an adapted length of the cathode band LKathode-ada is P , an adapted length of the anode strip LAnode-ada P and an adapted length of the separator band Ls ep arator-ada P calculated. The adjusted length of the anode strip can be calculated as L A nod e -ada P = L A nod e -zi ei + (L Ka thod e -ada P- LKathode-zie?. Accordingly, the adjusted length of the separator band can be calculated as Lse P arator-ada P — Read P arator-target + (LKathode-ada P " LKathode target) ■

[0048] Calculation of the adjusted length of the cathode band LKathode-ada P This can be done using the models described above and a computer simulation. The target capacitance Q of the electrode winding is kept constant during the calculation. Furthermore, the calculation is based on experimentally determined values, i.e., the effective thickness dAnode-eff of the selected anode coil and the effective thickness dCathode-eff of the selected cathode coil, or analogously, the effective loading BAnode-eff of the selected anode coil and the effective loading BCathode-eff of the selected cathode coil.

[0049] The calculation logic is based on the understanding that, for example, if there is a positive thickness deviation of the selected anode / cathode strip compared to the calculated target thickness, the length of the cathode strip must be shortened accordingly to keep the target capacitance Q of the electrode winding, and thus the circumference of the electrode winding, as constant as possible. A similar principle applies to a positive deviation in the loading of the selected anode / cathode strip compared to the calculated loading. Similarly, if there is a negative thickness deviation of the selected anode / cathode strip compared to the calculated target thickness, the length of the cathode strip must be shortened accordingly.In the event of a negative deviation in the loading of the selected anode / cathode band compared to the calculated loading of the anode / cathode band, the length of the cathode band is extended accordingly in order to keep the target capacitance Q of the electrode winding and thus the circumference of the electrode winding as constant as possible.

[0050] The inventors have determined that the calculation of the adapted length of the cathode band Liothode-adap in one embodiment can also be carried out using the following formulas:

[0051] L| <athode-adap — L| <athode-Ziel (1 +kd(1 (dAnode-eff + d|<athode-eff) / (dAnode-Ziel + d|<athode-Ziel)) , mit kd = 2 bis 5, vorzugsweise 2,5 bis 4, stärker bevorzugt 3 bis 3,5 ist, bzw.

[0052] L| <athode-adap — L| <athode-Ziel ( 1 +kß(1 (ßAnode-eff + B|<athode-eff) / (BAnode-Ziel + B|<athode-Ziel)) , mit kß = 5 bis 15, vorzugsweise 8 bis 14, stärker bevorzugt 10 bis 12 ist.

[0053] In step (vi) of the inventive process, the selected cathode roll is selected at LKathode-ada, the selected anode roll at LAnode-ada P and a provided separator roll is cut at Lse arator-ada. A separator strip, an anode strip, a separator strip, and a cathode strip are then layered on top of each other in step (vii) of the inventive process and wound to form an electrode coil. The anode roll or the anode strip preferably has a current collector foil onto which electrochemically active electrode materials are applied. Various metals can be used as materials for the current collector foil. Examples of suitable metals are copper, nickel, aluminum, chromium, silver, or stainless steel or a corresponding alloy. In the case of anode strips, the current collector foil is generally made of copper.

[0054] The anode roll or anode strip can, in particular, comprise an electrochemically active anode material. An electrochemically active anode material is understood to be, in particular, a material capable of absorbing and releasing lithium ions if the energy storage device is a lithium-ion energy storage device, or sodium ions if the energy storage device is a sodium-ion energy storage device. The electrochemically active anode material of the energy storage cell can expand, in particular, during the charging process, depending on the state of charge. This can be attributed, in particular, to the fact that during the charging process, the volume of the electrochemically active anode material increases due to intercalation or alloying of lithium or sodium into the electrochemically active anode material, for example, graphite or silicon oxides, silicon, or mixtures thereof.In one embodiment, the volume of the electrochemically active anode material increases by 5% or more, by 10% or more, by 20% or more, by 40% or more, or by 100% or more during a charging process from 0% SOC to 50% SOC.

[0055] In particular, the electrochemically active anode material can be selected from the group consisting of: synthetic graphite, natural graphite, graphene, mesocarbon, doped carbon, hard carbon, soft carbon, fullerene, silicon-carbon composites, silicon, surface-coated silicon, silicon suboxide, silicon alloys, aluminum alloys, indium, tin alloys, cobalt alloys, and mixtures thereof. Preferably, the electrochemically active anode material can be selected from the group consisting of: graphite, silicon oxide, and silicon, or mixtures thereof. Such electrochemically active anode materials are particularly suitable for providing lithium-ion storage cells with high capacity. In a particularly preferred embodiment, the electrochemically active anode material comprises silicon-based electrochemically active anode materials selected from silicon oxide, silicon, or mixtures thereof.In a sodium-ion battery, the anode coil or anode strip can comprise an electrochemically active anode material. This electrochemically active anode material can be designed to absorb and release sodium ions during charging and discharging. Specifically, the electrochemically active anode material in a sodium-ion battery can be hard carbon, for example, in the form of graphite, which, similar to a lithium-ion battery, can absorb and release sodium ions through intercalation. This process can also lead to an expansion of the electrochemically active anode material in the sodium-ion battery, similar to a lithium-ion battery.

[0056] The cathode roller or cathode strip preferably comprises a current collector foil onto which electrochemically active electrode materials are applied. Various metals can be used as materials for the current collector foil. Examples of suitable metals include copper, nickel, aluminum, chromium, silver, or stainless steel, or a corresponding alloy. In the case of cathode foils, the current collector foil is generally made of aluminum and / or aluminum alloys.

[0057] The cathode roll or cathode strip can, in particular, comprise an electrochemically active cathode material. In a lithium-ion energy storage cell, an electrochemically active cathode material is understood to be a cathode material capable of releasing and absorbing lithium ions during charging and discharging. In a lithium-ion energy storage cell, the electrochemically active cathode material can be selected from a group consisting of: lithium transition metal oxides such as lithium cobalt oxide (UCOO2), lithium nickel cobalt manganese compounds (abbreviated NCM or NCM), and lithium nickel cobalt manganese compounds (abbreviated NCM).NMC known), for example UCOO2, LiNio,33Coo,33Mno,3302, lithium nickel cobalt aluminum oxides (NCA), lithium olivines such as lithium iron phosphate (LFP), lithium spinels such as lithium manganese oxide spinel (LMO), lithium manganese nickel spinel (LNMO) or combinations thereof, further preferably wherein the electrochemically active cathode material is selected from a group consisting of: lithium nickel cobalt manganese compounds.

[0058] For example, materials containing sodium ions, such as phosphates and diphosphates (e.g., sodium iron phosphates) or compounds like Na₂ / ₃Fei / ₂Mni / ₂O₂, can be used as cathode materials in a sodium-ion energy storage cell. In addition to the electrochemically active anode and cathode materials, the materials for the anode coil / cathode coil or the anode strip / cathode strip can also contain other materials, such as binders and conductive additives. Examples of binders include carboxymethylcellulose, polyvinylidene fluoride (PVDF), and / or polytetrafluoroethylene (PTFE).

[0059] In an energy storage cell, an electrode winding is typically housed in a casing. The casing can have various geometric shapes. The casing can be made of metal, for example aluminum, or of plastic. Preferably, the casing is made of aluminum.

[0060] Battery electric vehicles frequently use cylindrical cells with a standardized casing design, for example, cylindrical cells with a type 18650 casing with an outer diameter of 18 mm and a longitudinal dimension of 6.5 cm, or cylindrical cells with a type 4680 casing with an outer diameter of 46 mm and a longitudinal dimension of 8 cm. Other examples include cylindrical cells with type 4695 or type 46120 casings, each with an outer diameter of 46 mm and longitudinal dimensions of 9.5 cm and 12 cm, respectively.

[0061] The present invention also relates to an electrode winding obtainable by the methods described herein.

[0062] The present invention further relates to a cylindrical cell comprising the electrode winding obtainable by the methods described herein and a housing. The cylindrical cell can additionally include an electrolyte solution. The electrolyte solution for the cylindrical cell can comprise a lithium salt as a conducting salt and at least one organic solvent. The electrolyte solution for the cylindrical cell can comprise a sodium salt as a conducting salt and at least one organic solvent.

[0063] In a lithium-ion energy storage cell, the lithium salt may preferably be selected from a group consisting of: LiPFe, LiAsFe, UCIO4, LiCFsSOs, lithium bis(trifluoromethylsulfonyl)amide or combinations thereof.

[0064] In a sodium-ion energy storage cell, the sodium salt may preferably be selected from the group consisting of: NaPFe, NaClO4, Na-bis(trifluoromethane)sulfonimide, Na-bis(fluorosulfonyl)imide, Na-difluoro(oxalato)borate, Na-bis(oxalato)borate, or combinations thereof. The organic solvent may, in particular, comprise a polar organic solvent. The organic solvent may, in particular, be selected from the group consisting of: C2 to C4 cyclic esters of carbonic acid, for example, propylene carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, lactones, for example, γ-, β-, and ε-lactone, or combinations thereof.

[0065] In the following, aspects of the present invention will be explained in more detail with reference to the figures. The figures show:

[0066] Figures 1a and 1b are schematic cross-sectional drawings of a power storage cell with one electrode winding at a low (Figure 1a) and a high (Figure 1b) charge state.

[0067] In the following, elements with the same function will be given the same reference symbols.

[0068] Figures 1a and 1b schematically show cross-sectional views of a conventional lithium-ion battery cell 1, including a housing 20, an anode strip 2, and a cathode strip 3 of the electrode winding. A mandrel 24 is located in the center of the electrode winding. The separator strip 4 is arranged between the anode strip 2 and the cathode strip 3. The lithium-ion battery cell 1 also has poles 21 and 22, which are electrically contacted by the current collector foils 18 of the anode strip 2 and the current collector foils 19 of the cathode strip 3, respectively. Figure 1a schematically shows the lithium-ion battery cell 1 at a low state of charge. Due to the low state of charge, the electrode winding has a diameter 6a, at which the housing 20 does not touch the electrode winding with its anode strip 2, cathode strip 3, and separator strip 4. Figure 1b schematically shows the lithium-ion storage cell 1 at a high state of charge.Due to the high charge level, the...

[0069] The electrode winding has a diameter of 6b, such that the housing makes circumferential contact with the electrode winding and the anode strip 2, cathode strip 3, and separator strip 4. Manufacturing-related variations in the thickness or charge of the anode strip and / or cathode strip can result in a positive thickness deviation or positive charge deviation of the anode strip and / or cathode strip after winding, which is accompanied by an increased diameter of the electrode winding. This can lead to an undesirably large expansion of the electrode winding during charging of the storage cell 1, especially when using electrochemically active silicon-based anode material. Due to the mechanically rigid housing 20, the electrode winding cannot expand further during charging of the storage cell 1 than until it reaches the housing.Repeated mechanical stresses during the charging of storage cell 1 can lead to or contribute to a complete failure of the energy storage system.

Claims

Patent claims 1. Method for manufacturing an electrode winding for a cylindrical cell, the electrode winding comprising an anode strip, a cathode strip and a separator strip, the method comprising the following steps: (i) Defining target parameters to achieve a target capacitance Q of the electrode winding, wherein the target parameters include: (a) target length of the cathode band Lxathode-ziei, and (b) Target thickness of the cathode band dcathode-ziei, (c) target length of the anode strip l_Anode-ziei, (d) Target thickness of the anode band dAnode-ziei, and (e) Target length of the separator band dse P arator-ziei, (ii) Providing a large number of anode rollers and cathode rollers, (iii) Determining an effective thickness dAnode-eff of the anode rolls and calculating the deviation Ad A node, where Ad A node = dAnode-eff- d Anode-ziei, and determining an effective thickness dcathode-eff of the cathode rolls and calculating the deviation Ad| <athode, WObei Ad|<athode — dCathode-eff dCathode-target, (iv) Selecting an anode roll from the plurality of anode rolls and a cathode roll from the plurality of cathode rolls to obtain a matching pair of selected anode roll and selected cathode roll, wherein the amount of the difference between AdAnode of the selected anode roll and AdCathode of the selected cathode roll is 1 pm or less, preferably 0.5 pm or less, (v) Calculating a fitted length of a cathode band LKathode-ada P , an adapted length of an anode strip LAnode-ada P and an adapted length of a separator band Ls ep arator-ada P , where the target capacitance Q of the electrode winding is kept constant, (vi) Cutting the selected anode roll at LAnode-ada P , Cutting of the selected cathode roll at LKathode-ada P and providing and cutting a separator roll at Ls ep arator-ada P to obtain multiple anode bands, multiple cathode bands and multiple separator bands; (vii) Layering a separator strip, an anode strip, a separator strip and a cathode strip on top of each other and winding the layered strips to obtain an electrode coil. Method for manufacturing an electrode winding for a cylindrical cell, the electrode winding comprising an anode band, a cathode band and a separator band, the method comprising the following steps: (i) Defining target parameters to achieve a target capacitance Q of the electrode winding, wherein the target parameters include: (a) Target length of the cathode band Lxathode-ziei, (b) Target loading of the cathode band Bxathode-ziei, (c) target length of the anode strip l_Anode-ziei, (d) Target loading of the anode belt BAnode-ziei, and (e) Target length of the separator band dse P arator-ziei, (ii) Providing a large number of anode rollers and cathode rollers, (iii) Determining an effective loading BAnode-eff of the anode rollers and calculating the percentage deviation ABAnode, and determining an effective loading Bxathode-eff of the cathode rollers and calculating the deviation ABKathode, wherein AB anode — (BAnode-eff BAnode-Target) / BAnode-Target ' 100 and AB Cathode — (Bcathode - effective Bcathode - target) / Bcathode - target * 100 (iv) Selecting an anode roll from the plurality of anode rolls and a cathode roll from the plurality of cathode rolls to obtain a matching pair of selected anode roll and selected cathode roll, wherein the amount of the difference ABAnode - ABCathode of the selected anode roll and the selected cathode roll is 0.25% or less, preferably 0.1% or less, (v) Calculating an adapted length of a cathode band Lxathode-adap, an adapted length of an anode band LAnode-ada P and an adapted length of a separator band Ls ep arator-ada P , where the target capacitance Q of the electrode winding is kept constant, (vi) Cutting the selected anode roll at LAnode-ada P , Cutting the selected cathode roll at Lxathode-adap and providing and cutting a separator roll at Ls ep arator-ada Pto obtain multiple anode bands, multiple cathode bands and multiple separator bands; (vii) Layering a separator strip, an anode strip, a separator strip and a cathode strip on top of each other and winding the layered strips to obtain an electrode coil.

3. A method according to any of the preceding claims, wherein the anode strip comprises an electrochemically active anode material selected from the group consisting of: synthetic graphite, natural graphite, graphene, mesocarbon, doped carbon, hard carbon, soft carbon, fullerene, silicon-carbon composites, silicon, surface-coated silicon, silicon suboxide, silicon alloys, aluminum alloys, indium, tin alloys, cobalt alloys and mixtures thereof, further preferably wherein the electrochemically active anode material is selected from the group consisting of: graphite, silicon oxide and silicon and mixtures thereof.

4. Method according to any of the preceding claims, wherein the anode strip comprises an electrochemically active silicon-based anode material selected to be silicon oxide, silicon or mixtures.

5. A method according to any of the preceding claims, wherein the cathode band comprises an electrochemically active cathode material selected from the group consisting of: lithium transition metal oxides such as lithium cobalt oxide (UCOO2), lithium nickel cobalt manganese compounds (known by the abbreviations NCM and NMC, respectively), for example UCOO2, LiNio,33Coo,33Mno,3302, lithium nickel cobalt aluminum oxides (NCA), lithium olivines such as lithium iron phosphate (LFP), lithium spinels such as lithium manganese oxide spinel (LMO), or combinations thereof, further preferably wherein the electrochemically active cathode material is selected from the group consisting of: lithium nickel cobalt manganese compounds.

6. Electrode windings, producible by a method according to one of the preceding claims.

7. Cylindrical cell comprising the electrode winding according to claim 6 and a housing.

8. Cylindrical cell according to claim 7, wherein the housing is selected from a housing of type 18650 having an outer diameter of 18 mm and an extent of 6.5 cm along the longitudinal axis, a housing of type 4680 having an outer diameter of 46 mm and an extent of 8 cm along the longitudinal axis, a housing of type 4695 having an outer diameter of 46 mm and an extent of 9.5 cm along the longitudinal axis, and a housing. of type 46120 with an outer diameter of 46 mm and an extent of 12 cm along the longitudinal axis, and preferably a housing of type 4680 with an outer diameter of 46 mm and an extent of 8 cm along the longitudinal axis.

Images