Electrochemical cell, comprising, as a solid-body electrolyte, a polymer compound defined in more detail and a conducting salt, corresponding method, corresponding solid-body electrolyte, corresponding uses, and corresponding kit

Abstract

The invention relates to an electrochemical cell, comprising, as a solid-body electrolyte, a polymer compound and a conducting salt, wherein - the polymer compound comprises at least one chemical structural element according to the following formula (I): -CH2CH(CH2OR)O-, and additionally at least one chemical structural element according to the following formula (II): -CH2CH(OR)CH2O-, and additionally at least one chemical structural element according to the following formula (III): -CH2CH(OR)CH2(OR), where R is, in case independently of one another, selected from the group consisting of: - alkyl groups, preferably selected from the list consisting of methyl group, ethyl group and propyl group, - acetyl group, - methoxyethane group, - phenyl group, - nitrile group, - silyl group, - metal sulfonate group, - metal sulfinate group, - halogen carbonyl group, - halogen sulfonyl group, and - hydroxy group.

Description

[0001] Electrochemical cell, comprising as solid electrolyte a more precisely defined polymer compound and a conducting salt, corresponding method, corresponding solid electrolyte, corresponding uses and corresponding kit

[0002] The present invention relates to an electrochemical cell comprising a more precisely defined polymer compound and a conductive salt as solid electrolyte.

[0003] The invention further relates to a corresponding method for producing an electrochemical cell. The invention also relates to a corresponding solid-state electrolyte comprising a more precisely defined polymer compound and a conductive salt. The invention also relates to the use of a corresponding solid-state electrolyte in an electrochemical cell.

[0004] The invention also relates to the use of a more precisely defined polymer compound as a component of a solid-state electrolyte and / or an electrochemical cell.

[0005] The invention further relates to a corresponding kit. The present invention relates to the technical field of energy storage technologies and corresponding materials.

[0006] To advance the electromobility market, research efforts are being conducted in particular in the field of energy storage technologies to realize innovative battery concepts. Electromobility is a key technology for replacing fossil fuels and reducing carbon dioxide (CO2) emissions. A particular focus of development efforts is on innovative material concepts for energy storage technologies with regard to energy density, lifetime efficiency, operating temperature range, charge / discharge cycles, safety properties, robustness, simplification of production, and cost reduction.

[0007] The textbook “Handbook of Lithium-Ion Batteries” by Reiner Korthauer (ed.), Springer Vieweg, 2013, ISBN 978-3-642-30653-2, discloses the use of polymer electrolytes in battery systems in Chapter 6.4 on page 74.

[0008] The article “Synthesis and characterization of hyperbranched polyglycerols with various degree of methylation employing phase-transfer conditions” by the authors N. Neumann, G. Abels, K. Koschek and L. Boskamp published in Polymer, 229, 2021 , 124002, https: / / doi.Org / 10.1016 / j.polymer.2021.124002, reveals the synthesis and characterization of polyglycerols with different degrees of methylation.

[0009] The article “Multifunctional hyperbranched prepolymers with tailored degree of methylation and methacrylation” by N. Neumann, S. Thinius, G. Abels, A. Hartwig, K. Koschek, and L. Boskamp, ​​published in Polymer, 276, 2023, 125886, https: / / doi.Org / 10.1016 / j.polymer.2023.125886, discloses a synthetic approach for multifunctional, cross-linkable, hyperbranched polymers with a tailored degree of methylation and methacrylation with complete conversion of all hydroxy groups.

[0010] Document US 6,472,106 B1 discloses a polymeric polyol in which at least 10% of the ends of the molecular chains are capped with monovalent groups, which has high ionic conductivity and remains amorphous when an ion-conducting salt is dissolved in high concentrations. Document US 6,469,107 B1 discloses an ion-conducting polymer electrolyte composition comprising a polymeric polyol, an ion-conducting salt, and a linkable functional group-bearing compound for producing an ion-conducting solid polymer electrolyte with high ionic conductivity.

[0011] In the field of the present invention, aprotic organic liquid electrolytes containing toxic, volatile, and flammable compounds are currently frequently used. Accordingly, their use is regularly associated with safety problems such as fire, explosions, and leaks. This is regularly perceived as extremely disadvantageous in the field of the present invention, and there is therefore a need for electrolytes that, while offering otherwise positive combinations of properties, do not exhibit the aforementioned safety problems or exhibit them to a lesser extent.

[0012] In the field of the present invention, there is a need for materials that function as electrolytes as efficiently as possible and whose use does not lead to the formation of dendrites containing lithium. Such dendrite formation is extremely problematic, particularly in secondary batteries, and is associated with functional impairments and safety risks. Such dendrite formation is therefore highly undesirable in electrolyte materials in the field of the present invention.

[0013] In the field of the present invention, there is a need for electrochemical cells with solid electrolytes, wherein the electrochemical cells have a high energy density.

[0014] In the field of the present invention, there is a need for electrochemical cells with solid-state electrolytes that have advantageously good ionic conductivity in combination with advantageously high elastic modulus.

[0015] In the field of the present invention, there is a need for electrochemical cells with solid-state electrolytes that have the lowest possible glass transition temperature. In particular, there is a need for electrochemical cells with solid-state electrolytes that have particularly advantageous combinations of an advantageously low glass transition temperature and an advantageously high modulus of elasticity. In particular, there is a need for electrochemical cells with solid-state electrolytes that have particularly advantageous combinations of an advantageously low glass transition temperature, an advantageously high modulus of elasticity, and an advantageously high ionic conductivity. Overall, there is a need in the field of the present invention for electrochemical cells with solid-state electrolytes that have advantageous mechanical properties and also exhibit satisfactory ionic conductivity.

[0016] There is a need for electrochemical cells with solid-state electrolytes that have one or more, preferably several, of the aforementioned advantageous properties and / or property combinations, and also enable acceptably good charging and / or discharging rates.

[0017] It was a primary object of the present invention to provide an electrochemical cell with an electrolyte material, wherein the above-mentioned problems do not occur or only occur to a reduced extent or the above-mentioned needs are met as advantageously as possible.

[0018] The invention is defined in the appended claims. Preferred aspects of the present invention will become apparent from the following description, including the examples. Where certain embodiments are designated as preferred for an aspect of the invention (electrochemical cell, method for producing an electrochemical cell, solid-state electrolyte, use of a solid-state electrolyte, use of a polymer compound, kit), the corresponding statements also apply to the other aspects of the present invention, mutatis mutandis. Preferred individual features of aspects of the invention (as defined in the claims and / or disclosed in the description) can be combined with one another and are preferably combined with one another, unless the present text indicates otherwise to the person skilled in the art in the individual case.

[0019] Likewise, the disadvantages of the prior art mentioned above also apply to the other aspects of the present invention; the considerations set out above regarding various tasks apply accordingly.

[0020] The primary object of the present invention and related further objects are achieved by an electrochemical cell comprising a polymer compound and a conducting salt as solid electrolyte, wherein the polymer compound comprises at least one chemical structural element according to the following formula (I): -CH2CH(CH2OR)O- (I) and additionally comprises at least one chemical structural element according to the following formula (II):

[0021] -CH2CH(OR)CH2O- (II) and additionally at least one chemical structural element according to the following formula (III):

[0022] -CH2CH(OR)CH2(OR) (III) where R is each independently selected from the group consisting of:

[0023] - Alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0024] - acetyl group,

[0025] - Methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22,

[0026] - phenyl group,

[0027] - Nitrile group,

[0028] - silyl group,

[0029] - metal sulfonate group,

[0030] - metal sulfinate group,

[0031] - halogenocarbonyl group,

[0032] - halogensulfonyl group, and

[0033] - hydroxy group; preferably from the group consisting of:

[0034] Alkyl group, preferably selected from the list consisting of

[0035] Methyl group, ethyl group and propyl group,

[0036] Acetyl group, - methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22,

[0037] - Nitrile group, and

[0038] - Silyl group, particularly preferably from the group consisting of:

[0039] - Alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0040] - Methoxyethane group of the general formula (-[CH2-CH2-O] n-CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22, and

[0041] - Nitrile group, most preferably from the group consisting of:

[0042] - alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group, and

[0043] - Methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22.

[0044] In the context of this text, the term "electrochemical cell" is understood, in accordance with the common understanding of those skilled in the art, to mean the basic, smallest electrochemical current-producing unit of a battery, consisting of two electrodes, an electrolyte, and a housing. In the context of this text, the term "solid electrolyte" is understood, in accordance with the common understanding of those skilled in the art, to mean a solid in which at least one type of ion is mobile enough for an electric current carried by these ions to flow.

[0045] In the context of the present invention, the term "polymer compound" is understood, in accordance with the common understanding of the person skilled in the art, to mean a chemical compound with a high relative molecular mass, the structure of which essentially comprises the multiple repetition of molecular units that are conceptually or actually derived from molecules of lower relative molecular mass. In the context of the present invention, molecules with a high relative molecular mass are understood to mean molecules in which the addition or removal of one of the aforementioned units has no relevant effect on the molecular behavior. In the context of the present invention, it is preferred that a "polymer compound" be three-dimensionally cross-linked.

[0046] In the context of this text, the term “conducting salt” is understood, in accordance with the usual understanding of the person skilled in the art, to mean salts which are capable of increasing the ionic conductivity of an electrolyte when added to the electrolyte.

[0047] In accordance with the usual understanding of the expert:

[0048] - the term “methyl group” means a group with the formula [-CH3];

[0049] - the term “ethyl group” means a group with the formula [-C2H5];

[0050] - the term “propyl group” means a group with the formula [-C3H7];

[0051] - the term “acetyl group” means a group with the formula [-C(O)CH3];

[0052] - the term “methoxyethane group” means a group of the general formula [-[CH2- CH2-O] n-CH3], where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22;

[0053] - the term “phenyl group” means a benzene residue, i.e. a group with the formula [-CeHs];

[0054] - the term “nitrile group” means a group with the formula [-R 1 -CN], where R 1 is selected from the list consisting of: [-CH2-], [-CH2-CH2-], [-CH2-CH2- CH2- ] and correspondingly longer-chain alkane derivatives, preferably from the list consisting of: [-CH2-], [-CH2-CH2-], [-CH2-CH2- CH2-]; - the term “silyl group” means a group with the formula [-SiR 1 R 2 R 3 ], where R 1 , R 2 and R 3Alkyl radicals are, preferably, alkyl radicals selected from the list consisting of: methyl group, ethyl group and propyl group;

[0055] - the term “metal sulfonate” refers to a group with the formula [-SO2-O~M + ], where M + is a monovalent metal cation;

[0056] - the term “metal sulfinate” refers to a group with the formula [-SO[-O“M + ], where M + is a monovalent metal cation;

[0057] - the term “halocarbonyl” means a group having the formula [-CO-X], where X is a halogen atom;

[0058] - the term “halosulfonyl” means a group of the formula [-SO2-X], where X is a halogen atom;

[0059] - the term “hydroxy group” means a group with the formula [-OH].

[0060] Preferred is an electrochemical cell (as described above, preferably as referred to above as preferred), wherein the polymer compound has a degree of branching in the range from 0.3 to 0.7, preferably in the range from 0.35 to 0.65, particularly preferably in the range from 0.4 to 0.6; and / or is in amorphous form.

[0061] The degree of branching is also known to those skilled in the art under the English term "degree of branching." The degree of branching is calculated according to equation 1 from the results of inverse gated decoupling. 13 C-NMR studies. The procedure is described in the article "Synthesis and characterization of hyperbranched polyglycerols with various degrees of methylation employing phase-transfer conditions" by N. Neumann, L. Boskamp, ​​A. Hartwig, and K. Koschek, published in Polymer 229 (2021) 124002, https: / / doi.org / 10.1016 / j.polymer.2021.124002.

[0062] Equation 1 :

[0063] In equation 1, "D" denotes the proportion of dendritic monomer units, "L13" and "L14" the proportion of linear monomer units, and "T" the proportion of terminal monomer units in the polymer compound. Whether a polymer compound is in amorphous form is determined by a person skilled in the art using X-ray photoelectron spectroscopy (XPS) and differential scanning calorimetry (DSC) based on their general technical knowledge. In X-ray photoelectron spectroscopy (XPS), diffraction data is acquired with a step size of 0.05° in the 20° range from 5° to 80° and a measurement time of 2 s per step. In differential scanning calorimetry (DSC), a measurement is carried out under a nitrogen atmosphere in the temperature range from -90°C to 100°C with a heating rate of 20 K min -1 In each case, further details on the procedure can be found in Example 6 of this text.

[0064] In particular, if the diffraction data from the XPS measurements do not show any sharp Bragg reflections, and if the DSC measurements show no further peaks (endothermic and / or exothermic) above the glass transition temperature besides a decomposition peak, the polymer compound is in amorphous form. With the specified degree of branching, a particularly positive combination of an advantageously high elastic modulus and an advantageously low glass transition temperature is obtained.

[0065] In the context of the present invention, the term “glass transition temperature” means the glass transition temperature (Tg Dsc) determined by means of dynamic differential calorimetry (DSC), unless otherwise stated in detail.

[0066] If the polymer compound is in amorphous form, a particularly high ionic conductivity of the solid-state electrolyte is often achieved.

[0067] In many cases, an electrochemical cell (as described above, preferably as referred to above as preferred) is particularly preferred, wherein the polymer compound has a degree of branching in the range of 0.3 to 0.7, preferably in the range of 0.35 to 0.65, particularly preferably in the range of 0.4 to 0.6; and is in amorphous form.

[0068] In these cases, a particularly positive combination of advantageously high modulus of elasticity and advantageously low glass transition temperature is regularly obtained, which is also accompanied by advantageously high ionic conductivity. Also preferred is an electrochemical cell (as described above, preferably as referred to above as preferred), wherein in the solid electrolyte the ratio of the number of alkali metal ions to the number of oxygen atoms is in the range from 1:50 to 1:5, preferably in the range from 1:20 to 1:10; and / or, preferably “and” the solid electrolyte is in surface adhesive contact with the cathode of the electrochemical cell; and / or, preferably “and” the solid electrolyte has an ionic conductivity, determined by means of electrochemical impedance spectroscopy, at 30 °C in the range of 10 -6 S cnr 1 to 10 -2 S cm -1 preferably in the range of 10 -5 S cm -1 up to 10 -3 S cm -1; and / or, preferably “and” the solid electrolyte has a glass transition temperature, determined by means of dynamic differential calorimetry, in the range from -70 °C to -10 °C, preferably in the range from -50 °C to -30 °C; and / or, preferably “and” the solid electrolyte has a Young's modulus, determined by means of dynamic mechanical analysis, in the range from 1 MPa to 500 MPa, preferably in the range from 10 MPa to 200 MPa.

[0069] In many cases, an electrochemical cell is particularly preferred (as described above, preferably as referred to above as preferred), in which the ratio of the number of alkali metal ions to the number of oxygen atoms in the solid electrolyte is in the range from 1:50 to 1:5, preferably in the range from 1:20 to 1:10; and the solid electrolyte is in surface adhesive contact with the cathode of the electrochemical cell; and the solid electrolyte has an ionic conductivity at 30 °C in the range from 10 -6 S cm-1 up to 10 -2 S cm -1 preferably in the range of 10 -5 S cm -1 up to 10 -3 S cm -1 .

[0070] In this way, combinations of properties are obtained which are perceived as particularly positive in the field of the present invention.

[0071] In the present invention, ionic conductivity is determined using electrochemical impedance spectroscopy (EIS). A Gamry Instruments Interface 101 OE potentiostat is used between -20 °C and 80 °C with an amplitude of 10 mV in a frequency range of 1 MHz to 1 Hz. Stainless steel (SS) electrodes (diameter = 18 mm) are coated with solid polymer electrolyte and placed in an El-Cell® ECC-Std test cell. After the measurement, the thickness of the solid polymer electrolyte layer is determined. The evaluation is performed using ZView® software, version 3.3a. Ionic conductivity is calculated using Equation 2 below.

[0072] Equation 2: ionic conductivity =

[0073] Where L is the thickness of the electrolyte layer, R is the resistance of the polymer electrolyte and S is the contact area between electrode and electrolyte.

[0074] The glass transition temperature is determined in the present invention by means of differential scanning calorimetry (DSC) with a TA Instruments Discovery DSC under nitrogen atmosphere in the temperature range from -90 °C to 100 °C and with a heating rate of 20 K min -1 The glass transition temperature (T g ) is the maximum of the first derivative of the heat flow during the initial heating. The TRIOS software from TA Instruments, version 4.5.0, is used for the evaluation.

[0075] In the present invention, the Young's modulus is determined by dynamic mechanical analysis (DMA) using a TA Instruments DMA Q800 in single-cantilever mode. The measurements are performed in a temperature range of -90 °C to 100 °C, with a frequency of 1 Hz, an amplitude of 20 pm, and a heating rate of 2 K min. -1A sample measuring 25 mm x 5 mm x 2 mm is used in each case. The data are evaluated using the TA Instruments TRIOS software (version 4.5.0).

[0076] Also preferred is an electrochemical cell (as described above, preferably as referred to above as preferred), wherein the electrochemical cell is part of a primary battery or a secondary battery, preferably the electrochemical cell is part of a secondary battery.

[0077] In many cases it is preferred if the electrochemical cell is a primary battery or a secondary battery, preferably the electrochemical cell is a secondary battery.

[0078] In the context of this text, the term "primary battery" is understood, in accordance with the common understanding of the person skilled in the art, to mean a battery that generates its energy from the consumption of chemical substances in one or more galvanic cells. A characteristic of a primary battery is that its discharge is irreversible, meaning that the primary cell can no longer be electrically recharged after it has been discharged.

[0079] In the context of this text, the term "secondary battery" is understood, in accordance with the common understanding of those skilled in the art, to mean a device for storing electrical energy from which electrical energy can be drawn. Unlike primary batteries, a secondary battery can be recharged after discharge. Recharging occurs with an electrical current flowing in the opposite direction to the current drawn during discharge.

[0080] In these cases, the effects and advantages of the invention are realized to a particularly high degree. Especially when the electrochemical cell is a secondary battery, the advantages of the invention are also realized over a particularly large number of charging cycles.

[0081] In the context of this text, the term “charging cycle” refers, in accordance with common professional understanding, to the process of completely discharging and charging a battery.

[0082] Also preferred is an electrochemical cell (as described above, preferably as referred to above as preferred), wherein the electrochemical cell is a secondary battery, preferably a secondary battery with a lithium-containing anode, particularly preferably a secondary battery with a lithium metal anode, and has a charge rate in the range from 0.05 C to 5 C, preferably in the range from 0.1 C to 2 C; and / or has a discharge rate in the range from 0.05 C to 5 C, preferably in the range from 0.1 C to 2 C; and / or has a residual capacity of more than 70% after 1000 charging cycles, preferably after 1200 charging cycles, particularly preferably after 1400 charging cycles, most particularly preferably after 1600 charging cycles.

[0083] Electrochemical cells having a charging rate in the above-defined range are regularly considered to be particularly advantageous in the field of the present invention.

[0084] Electrochemical cells having a discharge rate in the above-defined range are regularly considered to be particularly advantageous in the field of the present invention.

[0085] Electrochemical cells which have a combination of the above-mentioned charging rates with the above-mentioned discharging rates are particularly preferred in the field of the present invention in many cases, in particular if they additionally have a residual capacity of more than 70% over the above-mentioned number of charging cycles.

[0086] Methods for determining the remaining capacity, the charging rate and the discharging rate are known to the person skilled in the art from his general technical knowledge.

[0087] The other advantages and effects described in connection with the present invention are also realized here.

[0088] In many cases, an electrochemical cell is also preferred (as described above, preferably as referred to above as preferred), wherein the electrochemical cell is a secondary battery with a lithium-containing anode, particularly preferably a secondary battery with a lithium metal anode, and has a charge rate in the range of 0.05 C to 5 C, preferably in the range of 0.1 C to 2 C; and a discharge rate in the range of 0.05 C to 5 C, preferably in the range of 0.1 C to 2 C.

[0089] The other advantages and effects described in connection with the present invention are also realized here.

[0090] Also preferred is an electrochemical cell (as described above, preferably as described above as preferred), wherein the conducting salt

[0091] Cations selected from the group consisting of:

[0092] - Li +

[0093] - N / a+

[0094] - K +

[0095] - Mg 2+

[0096] - Ca 2+

[0097] - Al 3+

[0098] - Zn 2+ and

[0099] - mixtures thereof, preferably selected from the group consisting of:

[0100] - Li +

[0101] - N / a +

[0102] - K + particularly preferably selected from the group consisting of:

[0103] - Li +

[0104] - N / a + Most preferably, the conducting salt comprises Li + -cations; and / or is selected from the group of compounds consisting of:

[0105] - Lithium bis(trifluoromethylsulfonyl)amide (LiTFSI)

[0106] - Lithium bis(fluorosulfonyl)imide (LiFSI)

[0107] - Lithium bis(pentafluoroethanesulfonyl)imide (LiBETI)

[0108] - Lithium perchlorate OJCIO4)

[0109] - Lithium thiocyanate (LiSCN) - Lithium hexafluoroarsenate(V) (LiAsFe)

[0110] - Lithium hexafluoroantimonate (LiSbFe)

[0111] - Lithium tetrafluoroborate (LiBF4)

[0112] - Lithium bis(oxalato)borate (LiBOB)

[0113] - Lithium difluoro(oxalato)borate (LiDFOB)

[0114] - Lithium bis(monofluoromalonato)borate (LiBFMB)

[0115] - Lithium hexafluorophosphate (LiPF6)

[0116] - Lithium[tris(pentafluoroethyl)trifluorophosphate] (CeFiaLiP) and

[0117] - their mixtures.

[0118] In some cases, the analogous sodium compounds of the lithium compounds defined above are preferred.

[0119] In some cases, the analogous potassium compounds of the lithium compounds defined above are preferred.

[0120] In some cases, the analogous magnesium compounds of the lithium compounds defined above are preferred.

[0121] In some cases, the calcium analogues of the lithium compounds defined above are preferred.

[0122] In some cases, the analogous aluminum compounds of the lithium compounds defined above are preferred.

[0123] In some cases, the analogous zinc compounds of the lithium compounds defined above are preferred.

[0124] All combinations of the compounds defined above are also preferred in many cases.

[0125] The expert selects the appropriate ions and compounds according to the requirements of the individual case; based on his or her specialist knowledge, he or she can carry out simple optimization experiments without great effort.

[0126] Also preferred is an electrochemical cell (as described above, preferably as referred to above as preferred), wherein in the polymer compound and / or in the solid electrolyte the proportion of hydroxyl groups in the total number of functional groups is selected from the list consisting of

[0127] - Alkyl groups, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0128] - acetyl group,

[0129] - methoxyethane group,

[0130] - phenyl group,

[0131] - Nitrile group,

[0132] - silyl group,

[0133] - metal sulfonate group,

[0134] - metal sulfinate group,

[0135] - halogenocarbonyl group,

[0136] - halogensulfonyl group, is in the range of 0 mol% to 50 mol%, preferably in the range of 0 mol% to 2 mol%, particularly preferably in the range of 0 mol% to 0.1 mol%.

[0137] The presence of hydroxyl groups in the solid-state electrolyte often leads to undesirable interactions between the hydroxyl groups and metals, particularly when lithium is used. With a ratio as defined above, an electrochemical cell with positive combinations of properties is obtained even when metallic lithium is used in contact with the solid-state electrolyte. Particularly when the electrochemical cell is a secondary battery with a lithium-containing anode, preferably a secondary battery with a lithium-metal anode, the ratios defined above achieve advantageous combinations of properties with an advantageously high number of charging cycles and a residual capacity of more than 70%.

[0138] Also preferred is an electrochemical cell (as described above, preferably as referred to above as preferred), wherein the material of the cathode of the electrochemical cell comprises a material, preferably consists of a material selected from the group consisting of:

[0139] Lithium nickel cobalt manganese: Li(NiCoMn)02 Lithium manganese oxide spinel: LiMn2Ü4, Lithium cobalt oxide: IJC0O2, Lithium iron phosphate: LiFePC, Lithium nickel cobalt aluminum oxide: LiNiCoAlC>2, Lithium manganese phosphate: LMnP, Lithium cobalt phosphate: LCoP, Lithium nickel phosphate: LNiP, Lithium manganese iron phosphate: LMFP, Lithium manganese nickel oxide: LMNO,

[0140] Metal fluorides, preferably iron fluoride, copper fluoride or iron copper fluoride

[0141] Vanadium oxide

[0142] Metal sulfides, metal silicates and their mixtures.

[0143] With the cathode materials defined above, particularly good charging and / or discharging rates are achieved in many cases (as referred to above as preferred).

[0144] If the electrochemical cell is a secondary battery, particularly advantageous combinations of advantageously high charging rates and / or discharging rates and advantageously high number of charging cycles with a residual capacity of more than 70% are achieved in many cases with the cathode materials defined above.

[0145] A further object of the present invention is achieved by a method for producing an electrochemical cell, preferably as described above as preferred, at least comprising the following steps:

[0146] (S1) Producing or providing a precursor of a polymer compound, wherein the precursor of a polymer compound comprises at least one chemical structural element according to the following formula (I):

[0147] -CH2CH(CH2OR)O- (I) and additionally at least one chemical structural element according to the following formula (II): -CH2CH(OR)CH2O- (II) and additionally at least one chemical structural element according to the following formula (III):

[0148] -CH2CH(OR)CH2(OR) (III) where R is each independently selected from the group consisting of:

[0149] - Vinyl group,

[0150] - Acrylic group,

[0151] - methacrylic group,

[0152] - epoxy group,

[0153] - isocyanate group;

[0154] (52) contacting the precursor of a polymer compound prepared or provided in step (S1) with a conducting salt, preferably with lithium bis(trifluoromethylsulfonyl)amide, so that a precursor of a polymer compound mixed with conducting salt results;

[0155] (53) contacting the precursor of a polymer compound mixed with conductive salt resulting in step (S2) with a thermal initiator and / or a photochemical initiator, preferably a photoinitiator, so that a curable, preferably light-curable precursor of a polymer compound mixed with conductive salt results.

[0156] The process according to the invention produces electrochemical cells according to the invention in a particularly efficient and advantageous manner.

[0157] In the context of the present invention, the term “precursor of a polymer compound” refers to a compound which may itself be a polymer compound, but has a lower degree of crosslinking and different ratios of chemical radicals “R” than the polymer compound resulting in step (S5) after curing.

[0158] In accordance with the usual understanding of the expert:

[0159] - the term “vinyl group” refers to a group with the formula [-R 1 -CHCH2], where R 1 is selected from the list consisting of: [-CH2-], [-CH2-CH2-], [-CH2-CH2- CH2-] and correspondingly longer-chain alkane derivatives, preferably from the list consisting of: [— CH2— ], [-CH2-CH2-], [-CH2-CH2- CH2-];

[0160] - the term “acrylic group” means a group with the formula [-C(O)CHCH2];

[0161] - the term “methacrylic group” means a group with the formula [-C(O)C(CH2)CH3];

[0162] - the term “isocyanate group” means a group with the formula [-R 1 -NCO], where R 1 is selected from the list consisting of: [-CH2-], [-CH2-CH2-], [-CH2-CH2- CH2-] and correspondingly longer-chain alkane derivatives, preferably from the list consisting of: [-CH2-], [-CH2-CH2-], [-CH2-CH2- CH2-];

[0163] - the term “epoxide group” means a group with the formula [-R 1 -CHOCH2], where R 1 is selected from the list consisting of: [-CH2-], [-CH2-CH2-], [-CH2- CH2- CH2-] and correspondingly longer-chain alkane derivatives, preferably from the list consisting of: [-CH2-], [-CH2-CH2-], [-CH2-CH2- CH2-].

[0164] The basic procedure for identifying corresponding precursors of a polymer compound and for preparing corresponding polymer compounds is known from the article “Multifunctional hyperbranched prepolymers with tailored degree of methylation and methacrylation” by the authors N. Neumann, S. Thinius, G. Abels, A. Hartwig, K. Koschek and L. Boskamp, ​​published in Polymer, 276, 2023, 125886, https: / / doi.org / 10.1016Zj.po- lymer.2023.125886.

[0165] The effects and advantages described in connection with electrochemical cells according to the invention are realized to a particularly positive extent when the method according to the invention is carried out.

[0166] Also preferred is a process (as described above, preferably as referred to above as preferred), additionally comprising one or more of the following steps after the resulting curable, preferably light-curable, precursor of a polymer compound mixed with conductive salt in step (S3):

[0167] (S4) contacting an electrode with the curable, preferably light-curable, precursor of a polymer compound mixed with conductive salt resulting from step (S3) and / or

[0168] (S5) Curing the precursor of a polymer compound mixed with a conducting salt, preferably the light-curable precursor of a polymer compound mixed with a conducting salt, so that a solid electrolyte comprising a polymer compound and a conducting salt is obtained, which solid electrolyte is in surface contact with the electrode, wherein the polymer compound comprises at least one chemical structural element according to the following formula (I):

[0169] -CH2CH(CH2OR)O- (I) and additionally at least one chemical structural element according to the following formula (II):

[0170] -CH2CH(OR)CH2O- (II) and additionally at least one chemical structural element according to the following formula (III):

[0171] -CH2CH(OR)CH2(OR) (III) where R is each independently selected from the group consisting of:

[0172] - Alkyl groups, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0173] - acetyl group,

[0174] - Methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22,

[0175] - phenyl group,

[0176] - Nitrile group,

[0177] - silyl group,

[0178] - metal sulfonate group,

[0179] - metal sulfinate group,

[0180] - halogenocarbonyl group,

[0181] - halogensulfonyl group, and

[0182] Hydroxy group; preferably from the group consisting of:

[0183] - Alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0184] - acetyl group,

[0185] - Methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22,

[0186] - Nitrile group, and

[0187] - Silyl group, particularly preferably from the group consisting of:

[0188] - Alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0189] - Methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22, and

[0190] - Nitrile group, most preferably from the group consisting of:

[0191] - alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group, and

[0192] - Methoxyethane group of the general formula (-[CH2-CH2-O] n-CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22. In many cases, it is particularly preferred in the field of the present invention if the light-curable polymer compound mixed with conductive salt is polymerized directly on an electrode surface, resulting in a solid electrolyte that is in surface contact with the electrode. In these cases, a particularly advantageous good contact is achieved between the electrode and the solid electrolyte, which cannot usually be achieved by other means.

[0193] The other effects and advantages described in connection with the method according to the invention and / or the electrochemical cell according to the invention are also realized here to a particularly positive extent.

[0194] Also preferred is a process (as described above, preferably as referred to above as preferred), wherein in step (S3) during the contacting mixing of the polymer compound mixed with conductive salt resulting from step (S2) with a thermal initiator and / or a photochemical initiator, the initiator is selected from the group of compounds consisting of:

[0195] Azo compounds, preferably azobis(isobutyronitrile)

[0196] Peroxides, preferably dibenzoyl peroxide

[0197] Benzil ketals, preferably 2,2-dimethoxy-2-phenylacetophenones a-hydroxyketones, preferably 1-hydroxycyclohexylphenyl ketones a-alkoxyarylketones a-aminoarylketones camphor derivatives benzophenone derivatives thioxanthone derivatives

[0198] Acylphosphine oxides, preferably phenyl-bis-(2,4,6-trimethylbenzoyl)-phosphine oxide.

[0199] In many cases, type 1 photoinitiators are preferred as photochemical initiators. Type 1 photoinitiators generate radicals directly in a photofragmentation reaction; the resulting radical then triggers chain polymerization.

[0200] In many cases, type 2 photoinitiators are preferred as photochemical initiators. Type 2 photoinitiators abstract a hydrogen atom from a neighboring molecule upon excitation by photons, thus triggering chain polymerization. These initiators often enable a particularly efficient implementation of the process according to the invention and, moreover, regularly lead to electrochemical cells with particularly advantageous combinations of properties.

[0201] Particularly in cases where the process according to the invention is carried out in such a way that the light-curable polymer compound mixed with conductive salt is polymerized directly on an electrode surface, so that a solid-state electrolyte is formed which is in surface contact with the electrode, particularly advantageous results are achieved with the above-mentioned initiators, preferably with the above-mentioned photoinitiators.

[0202] A further object of the present invention is achieved by a solid electrolyte comprising a polymer compound and a conductive salt, wherein the polymer compound comprises at least one chemical structural element according to the following formula (I):

[0203] -CH2CH(CH2OR)O- (I) and additionally at least one chemical structural element according to the following formula (II):

[0204] -CH2CH(OR)CH2O- (II) and additionally at least one chemical structural element according to the following formula (III):

[0205] -CH2CH(OR)CH2(OR) (III) where R is each independently selected from the group consisting of:

[0206] - Alkyl groups, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0207] - acetyl group,

[0208] - Methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22, - phenyl group,

[0209] - Nitrile group,

[0210] - silyl group,

[0211] - metal sulfonate group,

[0212] - metal sulfinate group,

[0213] - halogenocarbonyl group,

[0214] - halogensulfonyl group, and

[0215] - hydroxy group; preferably from the group consisting of:

[0216] - Alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0217] - acetyl group,

[0218] - Methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22,

[0219] - Nitrile group, and

[0220] - silyl group; particularly preferably from the group consisting of:

[0221] - Alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0222] - Methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22, and

[0223] Nitrile group; most preferably from the group consisting of: - alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group, and

[0224] - Methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22, and where the conducting salt is preferably a lithium salt, particularly preferably lithium bis(trifluoromethylsulfonyl)amide.

[0225] The effects and advantages of the invention are realized to a particular extent by solid-state electrolytes as defined above.

[0226] A further object of the present invention is achieved by the use of a solid electrolyte (as described above, preferably as referred to above as preferred) in an electrochemical cell, preferably in an electrochemical cell as described above, preferably as referred to above as preferred.

[0227] By using a solid electrolyte in an electrochemical cell, the effects and advantages of the invention are realized to a particularly high degree.

[0228] A further object of the present invention is achieved by the use of a polymer compound as a component of a solid electrolyte and / or an electrochemical cell, wherein the polymer compound comprises at least one chemical structural element according to the following formula (I):

[0229] -CH2CH(CH2OR)O- (I) and additionally at least one chemical structural element according to the following formula (II):

[0230] -CH2CH(OR)CH2O- (II) and additionally at least one chemical structural element according to the following formula (III):

[0231] -CH2CH(OR)CH2(OR) (III) where R is each independently selected from the group consisting of:

[0232] - Alkyl groups, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0233] - acetyl group,

[0234] - Methoxyethane group of the general formula (-[CH2-CH2-O] n-CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22,

[0235] - phenyl group,

[0236] - Nitrile group,

[0237] - silyl group,

[0238] - metal sulfonate group,

[0239] - metal sulfinate group,

[0240] - halogenocarbonyl group,

[0241] - halogensulfonyl group, and

[0242] - hydroxy group; preferably from the group consisting of:

[0243] - Alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0244] - acetyl group,

[0245] - Methoxyethane group of the general formula (-[CH2-CH2-O] n-CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22,

[0246] - Nitrile group, and

[0247] - Silyl group, particularly preferably from the group consisting of:

[0248] - Alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0249] - Methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22, and

[0250] - Nitrile group, most preferably from the group consisting of:

[0251] - alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group, and

[0252] - Methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22.

[0253] By using a polymer compound as defined above as a component of a solid-state electrolyte and / or an electrochemical cell, solid-state electrolytes and / or electrochemical cells with particularly positive combinations of properties are obtained.

[0254] A further object of the present invention is achieved by a kit for producing a solid electrolyte and / or an electrochemical cell comprising a polymer compound and a conducting salt, wherein the polymer compound comprises at least one chemical structural element according to the following formula (I):

[0255] -CH2CH(CH2OR)O- (I) and additionally at least one chemical structural element according to the following formula (II):

[0256] -CH2CH(OR)CH2O- (II) and additionally at least one chemical structural element according to the following formula (III):

[0257] -CH2CH(OR)CH2(OR) (III) where R is each independently selected from the group consisting of:

[0258] - Alkyl groups, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0259] - acetyl group,

[0260] - Methoxyethane group of the general formula (-[CH2-CH2-O]n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22,

[0261] - phenyl group,

[0262] - Nitrile group,

[0263] - silyl group,

[0264] - metal sulfonate group,

[0265] - metal sulfinate group,

[0266] - halogenocarbonyl group,

[0267] - halogensulfonyl group, and

[0268] Hydroxy group; preferably from the group consisting of:

[0269] - Alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0270] - acetyl group,

[0271] - Methoxyethane group of the general formula (-[CH2-CH2-O] n-CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22,

[0272] - Nitrile group, and

[0273] - Silyl group, particularly preferably from the group consisting of:

[0274] - Alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group,

[0275] - Methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22, and

[0276] - Nitrile group, most preferably from the group consisting of:

[0277] - alkyl group, preferably selected from the list consisting of methyl group, ethyl group and propyl group, and

[0278] - Methoxyethane group of the general formula (-[CH2-CH2-O] n -CH3), where n is selected in the range from 1 to 40, preferably in the range from 5 to 35, particularly preferably in the range from 10 to 30, very particularly preferably in the range from 15 to 25, most preferably in the range from 18 to 22, and where the conducting salt is preferably a lithium salt, particularly preferably lithium bis(trifluoromethylsulfonyl)amide.

[0279] With the kit according to the invention, the method according to the invention is carried out in a particularly resource-saving, rapid and / or otherwise advantageous manner, preferably as described above as preferred.

[0280] The invention is described in more detail below using examples.

[0281] Examples

[0282] Example 1 - Synthesis of a polymer compound

[0283] 2.536 g of 1,1,1-tris(hydroxymethyl)propane (Sigma-Aldrich, Taufkirchen, Germany; purity >98.0%) were deprotonated with potassium methoxide solution (0.398 g of potassium methoxide (Sigma-Aldrich, Taufkirchen, Germany; purity >97.0%) in 4.4 mL of methanol (Sigma-Aldrich, Taufkirchen, Germany; purity >99.9%, dried over 3 Å molecular sieves) in a three-necked flask with stirring. The excess methanol was distilled off under vacuum at 60 °C to 80 °C.

[0284] Subsequently, 50 mL of glycidol (Sigma-Aldrich, Taufkirchen, Germany; purity 96%) was added dropwise using a syringe pump over a period of 16 hours under a nitrogen atmosphere, so that polymerization took place.

[0285] The reaction mixture was then dissolved in methanol (Sigma-Aldrich, Taufkirchen, Germany; purity >99.9%, dried over 3 Å molecular sieve) and neutralized over a column containing a methanol-conditioned cation exchange resin (Amberlite® IR-120, Sigma-Aldrich, Taufkirchen, Germany).

[0286] The polymer compound was then precipitated twice from a mixture of methanol (Sigma-Aldrich, Taufkirchen, Germany; purity >99.9%, dried over 3 Å molecular sieves) and acetone (PanReac AppliChem ITW Reagents, Darmstadt, Germany; purity: 99.5%), with acetone being significantly in excess in the mixture. Finally, the resulting product was dried under vacuum at 85 °C for 7 days.

[0287] The resulting polymer compound was a transparent liquid.

[0288] The synthesis method is known from the article "Multifunctional hyperbranched prepolymers with tailored degree of methylation and methacrylation" by N. Neumann, S. Thinius, G. Abels, A. Hartwig, K. Koschek, and L. Boskamp, ​​Polymer 276 (2023), 125886, https: / / doi.org / 10.1016 / j.polymer.2023.125886; see especially Section 2 and especially Section 2.3.1, as well as the literature sources cited therein in this context. Example 2 - Synthesis of methylated and / or methacrylated polymer compounds

[0289] From a polymer compound prepared according to Example 1 above, polymer compound type A, polymer compound type B, and polymer compound type C were synthesized by methylation and methacrylation as described below, each of which is described in more detail in Table 1.

[0290] Table 1

[0291] Ratio of methacrylate groups to methoxy groups

[0292] Polymer compound type A 0.26:0.74

[0293] Polymer compound type B 0.13:0.87

[0294] Polymer compound type C 0.05:0.95

[0295] Example 2-1 : Synthesis of a polymer compound of type A

[0296] For the preparation of polymer compound type A, the polymer compound prepared according to Example 1 above was reacted with 1.0 molar equivalents of dimethyl sulfate (Sigma-Aldrich, Taufkirchen, Germany; purity >99.8%); the molar equivalents refer to the hydroxy groups present in the amount of polymer compound prepared according to Example 1 above.

[0297] Subsequently, the remaining hydroxy groups in the polymer compound were treated with methacrylic anhydride (Sigma-Aldrich, purity 94%), triethylamine (Sigma-Aldrich, purity 99.5%) and 4-dimethylaminopyridine (Sigma-Aldrich, purity >99%), resulting in polymer compound type A.

[0298] The synthesis methods are known from the state of the art, in particular from the article "Multifunctional hyperbranched prepolymers with tailored degree of methylation and methacrylation" by N. Neumann, S. Thinius, G. Abels, A. Hartwig, K. Koschek, and L. Boskamp, ​​Polymer 276 (2023), 125886, https: / / doi.org / 10.1016 / j.polymer.2023.125886; see especially Section 2 and especially Section 2.3.2, as well as the literature sources cited therein in this context. Example 2-2: Synthesis of a polymer compound of type B

[0299] Polymer compound type B was prepared according to the procedure of Example 2-1 above, the only difference being that 1.2 molar equivalents of dimethyl sulfate were used for the reaction (and not 1.0 molar equivalents as in Example 2-1).

[0300] Example 2-3: Synthesis of a polymer compound of type C

[0301] Polymer compound type C was prepared according to the procedure of Example 2-1 above, the only difference being that 1.4 molar equivalents of dimethyl sulfate were used for the reaction (and not 1.0 molar equivalents as in Example 2-1).

[0302] Example 3: Preparation of light-curable polymer compounds mixed with conductive salt

[0303] Example 3-1 : Preparation of a light-curable polymer compound of type A-LiTFSI mixed with conductive salt

[0304] A polymer compound type A prepared according to Example 2-1 above was dried using synthetic air and mechanical mixing under compressed air until no OH band was detectable in the FTIR spectrum. FTIR spectra (Fourier transform infrared spectroscopy) were recorded using a Bruker ALPHA II series spectrometer equipped with an ALPHA'S Platinum ATR single-reflection diamond ATR module in a wavelength range between 4000 cm -1 and 400 cm -1 Spectra were recorded with a resolution of 2 cm -1 and 32 scans were measured. Bruker OPUS software (version 8.1) was used to process the data.

[0305] The subsequent preparation steps were then carried out in an argon-filled glove box (H2O, O2 < 0.1 ppm, MBraun).

[0306] The polymer compound of type A was mixed with finely ground lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) at 50 °C by mechanical stirring to form a homogeneous solution; Li:O = 1:20, approximately 24 wt.% LiTFSI depending on the oxygen atom content of the polymer compound of type A. EO backbone oxygen and ester oxygen were taken into account in the calculation.

[0307] The result was a polymer compound of type A-LiTFSI mixed with conductive salt. After 16 hours of stirring at 50 °C under exclusion of light, 1.0 wt. % (based on the total dry mass of the polymer compound of type A used) of 2,2-dimethoxy-2-phenylacetophenone (TCI Deutschland GmbH; purity >98.0%) was added as a photoinitiator, and the mixture was stirred for a further 2 h at 50 °C under exclusion of light.

[0308] The result was a light-curable polymer compound of type A-LiTFSI mixed with conductive salt.

[0309] Example 3-2: Preparation of a light-curable polymer compound of type B-LiTFSI mixed with conductive salt

[0310] A light-curable polymer compound of type B-LiTFSI mixed with conductive salt was prepared according to the procedure of Example 3-1 above, the only difference being that a polymer compound of type B prepared according to Example 2-2 above was used here (and not a polymer compound of type A as in Example 3-1).

[0311] Example 3-3: Preparation of a light-curable polymer compound of type C-LiTFSI mixed with conductive salt

[0312] A light-curable polymer compound of type C-LiTFSI mixed with conductive salt was prepared according to the procedure of Example 3-1 above, the only difference being that a polymer compound of type C prepared according to Example 2-3 above was used here (and not a polymer compound of type A as in Example 3-1).

[0313] Example 4: Preparation of a solid electrolyte on an electrode surface.

[0314] By producing solid-state electrolytes in a polymerization step directly on the electrode surface as described below, a particularly advantageous contact between electrode and solid-state electrolyte is achieved, which cannot usually be achieved by other means.

[0315] Example 4-1-1

[0316] A light-curable polymer compound of the type A-LiTFSI mixed with conductive salt, prepared according to Example 3-1 above, was applied in an amount of 0.08 g to a circular surface of a stainless steel electrode having a diameter of 18 mm. In order to create a smooth and uniform surface on the side facing away from the electrode, a 50 μm thick PeelPLAS® film based on a PA66 film with a plasma polymer release layer was placed on the electrode; corresponding films are known from the prior art, e.g. from the article “Release properties of plasma polymeric coated polymer films and adhesive strength of transferred polyurethane coatings to fiber- re in forced thermosets” by the authors J. Scheller, T. Brenner, M. Ott, T. Ffladung, PJ Baur in Advanced Manufacturing: Polymer & Composites Science 8 (2022) f l- 21 ; https: / / doi.org / 10.1080 / 20550340.2022.2033539.

[0317] The viscous light-curable polymer compound of type A-LiTFSI mixed with conductive salt was evenly distributed on the electrode surface by pressing the PeelPLAS® film and cured for 3 minutes under a conventional nail UV lamp (99N-UVL1 distributed by 99nails - Cura GmbH) with 0.7 W cm -2 (measured with BTS256-UV from Gigahertz-Optik) polymerized with a wavelength of 365 nm.

[0318] The PeelPLAS® film was then removed and the portion of the A-LiTFSI solid electrolyte protruding beyond the electrode edges was removed with a scalpel.

[0319] The result was a solid-state electrolyte of type A-LiTFSI with a layer thickness ranging from 200 pm to 400 pm, which was in full contact with the stainless steel electrode. This example of a solid-state electrolyte with a full contact with the electrode was used. The layer thickness was determined here and – unless otherwise specified – in the examples in this text using a micrometer screw.

[0320] Example 4-1-2

[0321] A light-curable polymer compound of the type A-LiTFSI mixed with conductive salt, prepared according to Example 3-1 above, was applied in an amount of 0.08 g to a circular surface of a lithium electrode which had a diameter of 18 mm. In order to create a smooth and uniform surface on the side facing away from the electrode, a 50 μm thick PeelPLAS® film based on a PA66 film with a plasma polymer release layer was placed on the electrode; corresponding films are known from the prior art, e.g. from the article “Release properties of plasma polymeric coated polymer films and adhesive strength of transferred polyurethane coatings to fiber- re in forced thermosets” by the authors J. Scheller, T. Brenner, M. Ott, T. Ffladung, PJ Baur in Advanced Manufacturing: Polymer & Composites Science 8 (2022) f l- 21 ; https: / / doi.org / 10.1080 / 20550340.2022.2033539.The viscous light-curable polymer compound of type A-LiTFSI mixed with conductive salt was evenly distributed on the electrode surface by pressing the PeelPLAS® film and cured for 3 minutes under a conventional nail UV lamp (99N-UVL1 distributed by 99nails - Cura GmbH) with 0.7 W cm. -2 (measured with BTS256-UV from Gigahertz-Optik) polymerized with a wavelength of 365 nm.

[0322] The PeelPLAS® film was then removed and the portion of the A-LiTFSI solid electrolyte protruding beyond the electrode edges was removed with a scalpel.

[0323] The result was a solid-state electrolyte of type A-LiTFSI with a layer thickness in the range of 200 pm to 400 pm, which is in surface contact with the lithium electrode, as an example of a solid-state electrolyte with surface contact with the electrode.

[0324] Example 4-1-3

[0325] A light-curable polymer compound of the type A-LiTFSI mixed with conductive salt, prepared according to Example 3-1 above, was applied in an amount of 0.08 g to a circular surface of a lithium iron phosphate electrode having a diameter of 18 mm. In order to create a smooth and uniform surface on the side facing away from the electrode, a 50 μm thick PeelPLAS® film based on a PA66 film with a plasma polymer release layer was placed on the electrode; corresponding films are known from the prior art, e.g. from the article “Release properties of plasma polymeric coated polymer films and adhesive strength of transferred polyurethane coatings to fiber-reinforced thermosets” by the authors J. Scheller, T. Brenner, M. Ott, T. Fladung, PJ Baur in Advanced Manufacturing: Polymer & Composites Science 8 (2022) 11-21; https: / / doi.org / 10.1080 / 20550340.2022.2033539.

[0326] The viscous light-curable polymer compound of type A-LiTFSI mixed with conductive salt was evenly distributed on the electrode surface by pressing the PeelPLAS® film and cured for 3 minutes under a conventional nail UV lamp (99N-UVL1 distributed by 99nails - Cura GmbH) with 0.7 W cm -2 (measured with BTS256-UV from Gigahertz-Optik) polymerized with a wavelength of 365 nm.

[0327] The PeelPLAS® film was then removed, and the portion of the A-LiTFSI solid-state electrolyte extending beyond the electrode edges was removed with a scalpel. This resulted in an A-LiTFSI solid-state electrolyte in surface contact with the lithium iron phosphate electrode, with a layer thickness ranging from 200 μm to 400 μm, as an example of a solid-state electrolyte in surface contact with the electrode.

[0328] Example 4-2-1 : Production of a solid-state electrolyte of type B-LiTFSI in surface contact with a stainless steel electrode

[0329] A solid-state electrolyte of type B-LiTFSI with a layer thickness in the range of 200 pm to 400 pm (as an example of a solid-state electrolyte in surface contact with the electrode) was produced according to the procedure of Example 4-1-1 above, the only difference being that a light-curable polymer compound of type B-LiTFSI mixed with conductive salt, produced according to Example 3-2 above, was used here (and not, as in Example 4-1-1, a light-curable polymer compound of type A-LiTFSI mixed with conductive salt).

[0330] Example 4-2-2: Production of a solid-state electrolyte of type B-LiTFSI in surface contact with a lithium electrode

[0331] A solid-state electrolyte of type B-LiTFSI with a layer thickness in the range of 200 pm to 400 pm (as an example of a solid-state electrolyte in surface contact with the electrode) was produced according to the procedure of Example 4-1-2 above, the only difference being that a light-curable polymer compound of type B-LiTFSI mixed with conductive salt, prepared according to Example 3-2 above, was used here (and not, as in Example 4-1-2, a light-curable polymer compound of type A-LiTFSI mixed with conductive salt).

[0332] Example 4-2-3: Preparation of a solid-state electrolyte of type B-LiTFSI in surface contact with a lithium iron phosphate electrode

[0333] A solid-state electrolyte of type B-LiTFSI with a layer thickness in the range of 200 pm to 400 pm (as an example of a solid-state electrolyte in surface contact with the electrode) was produced according to the procedure of Example 4-1-3 above, the only difference being that a light-curable polymer compound of type B-LiTFSI mixed with conducting salt, produced according to Example 3-2 above, was used here (and not, as in Example 4-1-3, a light-curable polymer compound of type A-LiTFSI mixed with conducting salt).

[0334] Example 4-3-1 : Production of a solid-state electrolyte of type C-LiTFSI in surface contact with a stainless steel electrode

[0335] A solid-state electrolyte of type C-LiTFSI with a layer thickness in the range of 200 pm to 400 pm (as an example of a solid-state electrolyte in surface contact with the electrode) was produced according to the procedure of Example 4-1-1 above, the only difference being that a light-curable polymer compound of type C-LiTFSI mixed with conductive salt, produced according to Example 3-3 above, was used here (and not, as in Example 4-1-1, a light-curable polymer compound of type A-LiTFSI mixed with conductive salt).

[0336] Example 4-2-2: Production of a solid-state electrolyte of type C-LiTFSI in surface contact with a lithium electrode

[0337] A solid-state electrolyte of type C-LiTFSI with a layer thickness in the range of 200 pm to 400 pm (as an example of a solid-state electrolyte in surface contact with the electrode) was produced according to the procedure of Example 4-1-2 above, the only difference being that a light-curable polymer compound of type C-LiTFSI mixed with conductive salt, prepared according to Example 3-3 above, was used here (and not, as in Example 4-1-2, a light-curable polymer compound of type A-LiTFSI mixed with conductive salt).

[0338] Example 4-2-3: Preparation of a solid-state electrolyte of type C-LiTFSI in surface contact with a lithium iron phosphate electrode

[0339] A C-LiTFSI solid-state electrolyte with a lithium iron phosphate electrode in surface contact and a layer thickness ranging from 200 μm to 400 μm (as an example of a solid-state electrolyte in surface contact with the electrode) was prepared according to the procedure of Example 4-1-3 above. The only difference from the procedure in Example 4-1-3 was that a light-curable C-LiTFSI polymer compound mixed with a conducting salt, prepared according to Example 3-3 above, was used here (and not, as in Example 4-1-3, a light-curable A-LiTFSI polymer compound mixed with a conducting salt). Example 5: Preparation of Solid-State Electrolytes Without Electrode Contact During Polymerization

[0340] Example 5-1 : Preparation of solid-state electrolytes of type A-LiTFSI without electrode contact during polymerization

[0341] A light-curable polymer compound of type A-LiTFSI mixed with conductive salt, prepared according to Example 3-1 above, was cast into a silicone mold with dimensions of 25 mm x 5 mm x 2 mm.

[0342] A 50 pm thick PeelPLAS® film was placed on top of the open side of the silicone mold as a seal; corresponding films are known from the state of the art, e.g. from the technical article "Release properties of plasma polymeric coated polymer films and adhesive strength of transferred polyurethane coatings to fiber- re in forced thermosets" by the authors J. Scheller, T. Brenner, M. Ott, T. Fladung, PJ Baur in Advanced Manufacturing: Polymer & Composites Science 8 (2022) 11-21 ; https: / / doi.org / 10.1080 / 20550340.2022.2033539.

[0343] Then the light-curable polymer compound mixed with conductive salt in the silicone mold was cured for 8 minutes under a UV lamp (Nagel, 99N-UVL1 distributed by 99nails - Cura GmbH) with 0.7 Wem -2(measured with BTS256-UV from Gigahertz-Optik) at a wavelength of 365 nm. The partially polymerized sample was then removed, rotated 180°, and polymerized for another 2 minutes under the same irradiation conditions.

[0344] The result was a sample of a solid-state electrolyte of type A-LiTFSI.

[0345] Example 5-2: Preparation of solid-state electrolytes of type B-LiTFSI without electrode contact during polymerization

[0346] A light-curable conductive salt-blended polymer compound of type B-LiTFSI, prepared according to Example 3-2 above, was cast into a silicone mold with dimensions of 25 mm x 5 mm x 2 mm.

[0347] A 50 pm thick PeelPLAS® film was placed on top of the open side of the silicone mold as a seal; corresponding films are known from the state of the art, e.g. from the technical article "Release properties of plasma polymeric coated polymer films and adhesive strength of transferred polyurethane coatings to fiber- re in forced thermosets" by the authors J. Scheller, T. Brenner, M. Ott, T. Fladung, PJ Baur in Advanced Manufacturing: Polymer & Composites Science 8 (2022) 11-21 ; https: / / doi.org / 10.1080 / 20550340.2022.2033539.

[0348] Then the light-curable polymer compound mixed with conductive salt in the silicone mold was cured for 8 minutes under a UV lamp (Nagel, 99N-UVL1 distributed by 99nails - Cura GmbH) with 0.7 W em -2(measured with BTS256-UV from Gigahertz-Optik) at a wavelength of 365 nm. The partially polymerized sample was then removed, rotated 180°, and polymerized for another 2 minutes under the same irradiation conditions.

[0349] The result was a sample of a solid-state electrolyte of type B-LiTFSI.

[0350] Example 5-3: Preparation of solid-state electrolytes of type C-LiTFSI without electrode contact during polymerization

[0351] A light-curable polymer compound of type C-LiTFSI mixed with conductive salt, prepared according to Example 3-3 above, was cast into a silicone mold with dimensions of 25 mm x 5 mm x 2 mm.

[0352] A 50 pm thick PeelPLAS® film was placed on top of the open side of the silicone mold as a seal; corresponding films are known from the state of the art, e.g. from the technical article "Release properties of plasma polymeric coated polymer films and adhesive strength of transferred polyurethane coatings to fiber- re in forced thermosets" by the authors J. Scheller, T. Brenner, M. Ott, T. Fladung, PJ Baur in Advanced Manufacturing: Polymer & Composites Science 8 (2022) 11-21 ; https: / / doi.org / 10.1080 / 20550340.2022.2033539.

[0353] Then the light-curable polymer compound mixed with conductive salt in the silicone mold was cured for 8 minutes under a UV lamp (Nagel, 99N-UVL1 distributed by 99nails - Cura GmbH) with 0.7 Wem -2(measured with BTS256-UV from Gigahertz-Optik) at a wavelength of 365 nm. The partially polymerized sample was then removed, rotated 180°, and polymerized for another 2 minutes under the same irradiation conditions.

[0354] The result was a sample of a solid-state electrolyte of type C-LiTFSI.

[0355] Samples of a solid-state electrolyte of type A-LiTFSI prepared according to Example 5-1 above were investigated for their properties. The glass transition temperature was determined by differential scanning calorimetry (DSC) (T9DSC), the glass transition temperature was determined by dynamic mechanical analysis (DMA) (T9DMA), the Young's modulus was determined, the ionic conductivity was determined at 30 °C and 60 °C, and the transference number for Li was determined. +-ions (tu+). In an analogous manner, samples of a solid-state electrolyte of type B-LiTFSI prepared according to Example 5-2 above and samples of a solid-state electrolyte of type C-LiTFSI prepared according to Example 5-3 above were also investigated. The results of the investigations are presented in Table 1.

[0356] Table 1

[0357] Solid-state electro- T g osc T9DMA E-modulus ionic conductivity ionic conductivity tu+ lyt ity at 30 °C at 60 °C

[0358] [°C] [°C] MPa [S em- 1 ] [See

[0359] Type A-LiTFSI -18 -7 152 ± 28 3.2 ■ 10" 9 9.1 8 0.19

[0360] Type B-LiTFSI -28 -19 22 ± 4 2.7 ■ 10" 7 3.5 ■ 10" 6 0.08

[0361] Type C-LiTFSI -39 -25 1.6 ± 0.4 2.1 - 10 -6 2.0 ■ 10" 5 0.07

[0362] The glass transition temperature “T gDSC” was carried out using Differential Scanning Calorimetry (DSC) with a TA Instruments Discovery DSC under nitrogen atmosphere in the temperature range from -90 °C to 100 °C and with a heating rate of 20 K min -1 The glass transition temperature (T g ) is the maximum of the first derivative of the heat flow during the initial heating. The TRIOS software from TA Instruments, version 4.5.0, was used for the evaluation.

[0363] The Young’s modulus and the glass transition temperature “T g DMA was determined using dynamic mechanical analysis (DMA) with a TA Instruments DMA Q800 in single-cantilever mode. The measurements were performed in a temperature range of -90 °C to 100 °C, with a frequency of 1 Hz, an amplitude of 20 pm, and a heating rate of 2 K min -1A sample measuring 25 mm x 5 mm x 2 mm was used in each case. The data were analyzed using TA Instruments' TRIOS software (version 4.5.0).

[0364] Ionic conductivity was determined in the present invention using electrochemical impedance spectroscopy (EIS). A Gamry Instruments Interface 101 OE potentiostat was used between -20 °C and 80 °C with an amplitude of 10 mV in a frequency range of 1 MHz to 1 Hz. Stainless steel (SS) electrodes (diameter = 18 mm) were coated with solid polymer electrolyte and placed in an El-Cell® ECC-Std test cell. After the measurement, the thickness of the solid polymer electrolyte layer was determined. The impedance data were evaluated using ZView® software, version 3.3a. Ionic conductivity was calculated using Equation 2 below.

[0365] Equation 2: ionic conductivity =

[0366] Where L is the thickness of the electrolyte layer, R is the volume resistivity of the polymer electrolyte, and S is the contact area between the electrode and the electrolyte. The results in Table 1 show advantageously low glass transition temperatures with advantageously high Young's moduli.

Claims

1. An electrochemical cell comprising, as solid electrolyte, a polymer compound and a conductive salt, wherein the polymer compound comprises at least one chemical structural element according to the following formula (I): -CH2CH(CH2OR)O- (I) and additionally at least one chemical structural element according to the following formula (II): -CH2CH(OR)CH2O- (II) and additionally at least one chemical structural element according to the following formula (III): -CH2CH(OR)CH2(OR) (III) where R is each independently selected from the group consisting of: - Alkyl groups, preferably selected from the list consisting of methyl group, ethyl group and propyl group, - acetyl group, - methoxyethane group, - phenyl group, - Nitrile group, - silyl group, - metal sulfonate group, - metal sulfinate group, - halogenocarbonyl group, - halogensulfonyl group, and - hydroxy group.

2. Electrochemical cell according to claim 1, wherein the polymer compound has a degree of branching in the range of 0.3 to 0.7, preferably in the range of 0.35 to 0.65, particularly preferably in the range of 0.4 to 0.6; and / or is in amorphous form.

3. Electrochemical cell according to one of the preceding claims, wherein in the solid electrolyte the ratio of the number of alkali metal ions to the number of oxygen atoms is in the range from 1:50 to 1:5, preferably in the range from 1:20 to 1:10; and / or the solid electrolyte is in surface adhesive contact with the cathode of the electrochemical cell; and / or the solid electrolyte has an ionic conductivity at 30 °C in the range from 10 -6 S cm -1 up to 10 -2 S cm -1 preferably in the range of 10 -5 S cm -1 up to 10 -3 S cm-1 ; and / or the solid electrolyte has a glass transition temperature in the range of -70 °C to -10 °C, preferably in the range of -50 °C to -30 °C; and / or the solid electrolyte has a modulus of elasticity in the range of 1 MPa to 500 MPa.

4. Electrochemical cell according to one of the preceding claims, wherein the electrochemical cell is part of a primary battery or a secondary battery, preferably the electrochemical cell is part of a secondary battery.

5. Electrochemical cell according to one of the preceding claims, wherein the electrochemical cell is a secondary battery, preferably a secondary battery with a lithium-containing anode, more preferably a secondary battery with a lithium metal anode, and has a charge rate in the range of 0.05 C to 5 C, preferably in the range of 0.1 C to 2 C; and / or has a discharge rate in the range of 0.05 C to 5 C, preferably in the range of 0.1 C to 2 C and / or has a residual capacity of more than 70% after 1000 charging cycles, preferably after 1200 charging cycles, more preferably after 1400 charging cycles, most preferably after 1600 charging cycles.

6. Electrochemical cell according to one of the preceding claims, wherein the conducting salt Cations selected from the group consisting of: - Li + - N / a + - K + - Mg 2+ - Ca 2+ - Al 3+ - Zn 2+ and - mixtures thereof and / or selected from the group of compounds consisting of: - Lithium bis(trifluoromethylsulfonyl)amide (LiTFSI) - Lithium bis(fluorosulfonyl)imide (LiFSI) - Lithium bis(pentafluoroethanesulfonyl)imide (LiBETI) - Lithium perchlorate OJCIO4) - Lithium thiocyanate (LiSCN) - Lithium hexafluoroarsenate(V) (LiAsFe) - Lithium hexafluoroantimonate (LiSbFe) - Lithium tetrafluoroborate (LiBF4) - Lithium bis(oxalato)borate (LiBOB) - Lithium difluoro(oxalato)borate (LiDFOB) - Lithium bis(monofluoromalonato)borate (LiBFMB) - Lithium hexafluorophosphate (LiPF6) - Lithium[tris(pentafluoroethyl)trifluorophosphate] (CeFiaLiP) and - their mixtures.

7. Electrochemical cell according to one of the preceding claims, wherein in the polymer compound and / or in the solid electrolyte the proportion of hydroxy groups of the total number of functional groups selected from the list consisting of - Alkyl groups, preferably selected from the list consisting of methyl group, ethyl group and propyl group, - acetyl group, - methoxyethane group, - phenyl group, - Nitrile group, - silyl group, - metal sulfonate group, - metal sulfinate group, - halogenocarbonyl group, - halogensulfonyl group, is in the range of 0 mol% to 50 mol%, preferably in the range of 0 mol% to 2 mol%, particularly preferably in the range of 0 mol% to 0.1 mol%. - M - 8. Electrochemical cell according to one of the preceding claims, wherein the material of the cathode of the electrochemical cell is selected from the group consisting of: the material of the cathode of the electrochemical cell comprises a material, preferably consists of a material selected from the group consisting of: Lithium nickel cobalt manganese: Li(NiCoMn)G2 Lithium manganese oxide spinel: LiMn2Ü4, lithium cobalt oxide: LiCoG2, Lithium iron phosphate: LiFePO4, Lithium nickel cobalt aluminum oxide: LiNiCoAIG2, Lithium manganese phosphate: LMnP, Lithium cobalt phosphate: LCoP, Lithium nickel phosphate: LNiP, Lithium manganese iron phosphate: LMFP, Lithium manganese nickel oxide: LMNO, Metal fluorides, preferably iron fluoride, copper fluoride or iron copper fluoride Vanadium oxide, metal sulfides, metal silicates and their mixtures.

9. A method for producing an electrochemical cell, preferably an electrochemical cell according to one of claims 1 to 8, comprising at least the following steps: (S1) Producing or providing a precursor of a polymer compound, wherein the precursor of a polymer compound comprises at least one chemical structural element according to the following formula (I): -CH2CH(CH2OR)O- (I) and additionally at least one chemical structural element according to the following formula (II): -CH2CH(OR)CH2O- (II) and additionally at least one chemical structural element according to the following formula (III): -CH2CH(OR)CH2(OR) (III) where R is each independently selected from the group consisting of: - Vinyl group, - Acrylic group, - methacrylic group, - epoxy group, - isocyanate group; (52) contacting the precursor of a polymer compound prepared or provided in step (S1) with a conducting salt, preferably with lithium bis(trifluoromethylsulfonyl)amide, so that a precursor of a polymer compound mixed with conducting salt results; (53) contacting the precursor of a polymer compound mixed with conductive salt resulting in step (S2) with a thermal initiator and / or a photochemical initiator, preferably a photoinitiator, so that a curable, preferably light-curable precursor of a polymer compound mixed with conductive salt results.

10. The method according to claim 9, additionally comprising one or more of the following steps after the resulting curable, preferably light-curable, precursor of a polymer compound mixed with conductive salt in step (S3): (54) contacting an electrode with the curable, preferably light-curable, precursor of a polymer compound mixed with conductive salt resulting in step (S3) and / or (S5) Curing the precursor of a polymer compound mixed with a conducting salt, preferably the light-curable precursor of a polymer compound mixed with a conducting salt, so that a solid electrolyte comprising a polymer compound and a conducting salt is obtained and is in surface contact with the electrode, wherein the polymer compound comprises at least one chemical structural element according to the following formula (I): -CH2CH(CH2OR)O- (I) and additionally at least one chemical structural element according to the following formula (II): -CH2CH(OR)CH2O- (II) and additionally at least one chemical structural element according to the following formula (III): -CH2CH(OR)CH2(OR) (III) where R is each independently selected from the group consisting of: - Alkyl groups, preferably selected from the list consisting of methyl group, ethyl group and propyl group, - acetyl group, - methoxyethane group, - phenyl group, - Nitrile group, - silyl group, - metal sulfonate group, - metal sulfinate group, - halogenocarbonyl group, - halogensulfonyl group, and - hydroxy group.

11. The method according to any one of the preceding claims 9 or 10, wherein in step (S3) during the contacting mixing of the polymer compound mixed with conductive salt resulting from step (S2) with a thermal initiator and / or a photochemical initiator, the initiator is selected from the group of compounds consisting of: Azo compounds, preferably azobis(isobutyronitrile) peroxides, preferably dibenzoyl peroxide Benzil ketals, preferably 2,2-dimethoxy-2-phenylacetophenones a-hydroxyketones, preferably 1-hydroxycyclohexylphenyl ketones a-alkoxyarylketones a-aminoarylketones camphor derivatives benzophenone derivatives thioxanthone derivatives Acylphosphine oxides, preferably phenyl-bis-(2,4,6-trimethylbenzoyl)-phosphine oxide.

12. A solid electrolyte comprising a polymer compound and a conductive salt, wherein the polymer compound comprises at least one chemical structural element according to the following formula (I): -CH2CH(CH2OR)O- (I) and additionally at least one chemical structural element according to the following formula (II): -CH2CH(OR)CH2O- (II) and additionally at least one chemical structural element according to the following formula (III): -CH2CH(OR)CH2(OR) (III) where R is each independently selected from the group consisting of: Alkyl groups, preferably selected from the list consisting of methyl group, ethyl group and propyl group, acetyl group, methoxyethane group, phenyl group, Nitrile group, silyl group, M eta I Is u Ifo n at group, metal sulfinate group, halogenocarbonyl group, halogensulfonyl group, and hydroxy group; and wherein the conducting salt is preferably a lithium salt, particularly preferably lithium bis(trifluoromethylsulfonyl)amide.

13. Use of a solid electrolyte according to claim 12 in an electrochemical cell, preferably in an electrochemical cell according to one of claims 1 to 8.

14. Use of a polymer compound as a component of a solid electrolyte and / or an electrochemical cell, wherein the polymer compound comprises at least one chemical structural element according to the following formula (I): -CH2CH(CH2OR)O- (I) and additionally comprises at least one chemical structural element according to the following formula (II): -CH2CH(OR)CH2O- (II) and additionally at least one chemical structural element according to the following formula (III): -CH2CH(OR)CH2(OR) (III) where R is each independently selected from the group consisting of: - Alkyl groups, preferably selected from the list consisting of methyl group, ethyl group and propyl group, - acetyl group, - methoxyethane group, - phenyl group, - Nitrile group, - silyl group, - metal sulfonate group, - metal sulfinate group, - halogenocarbonyl group, - halogensulfonyl group, and - hydroxy group.

15. Kit for producing a solid electrolyte and / or an electrochemical cell comprising a polymer compound and a conducting salt, wherein the polymer compound comprises at least one chemical structural element according to the following formula (I): -CH2CH(CH2OR)O- (I) and additionally at least one chemical structural element according to the following formula (II): -CH2CH(OR)CH2O- (II) and additionally at least one chemical structural element according to the following formula (III): -CH2CH(OR)CH2(OR) (III) where R is each independently selected from the group consisting of: - Alkyl groups, preferably selected from the list consisting of methyl group, ethyl group and propyl group, - acetyl group, - methoxyethane group, - phenyl group, - Nitrile group, - silyl group, - metal sulfonate group, - metal sulfinate group, - halogenocarbonyl group, - halogensulfonyl group, and - hydroxy group, and wherein the conducting salt is preferably a lithium salt, particularly preferably lithium bis(trifluoromethylsulfonyl)amide

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