DE102021117377A1 - Process for producing a separator and/or a separator layer - Google Patents

Abstract

Method for producing a separator (1), which can be used in a solid-state battery cell, by means of laser sintering; comprising at least the following steps:a) providing a base (2);b) arranging a separator material (3) in the form of a powder material, slurry or as a green compact on the base (2);c) impinging on the separator material (3) with a laser beam (4) and forming the separator (1) by sintering the separator material (3). A correspondingly produced separator (1) is also specified.

Description

The invention relates to a method for producing a separator and/or a separator layer. The separator or the separator layer is intended for use in a solid-state battery cell or is used in a solid-state battery cell. The separator and the separator layer are referred to below in particular as a separator.

The battery cell comprises a gas-tight housing and at least one stack of electrode foils or layers arranged one on top of the other arranged therein. The housing can be designed as a dimensionally stable housing (prismatic cell) or at least partially made of an elastically deformable film material (pouch cell). A combination of both housing types is also possible.

A battery cell is an electricity storage device that B. is used in a motor vehicle for storing electrical energy. In particular, z. B. a motor vehicle has an electric machine for driving the motor vehicle, wherein the electric machine can be driven by the electrical energy stored in the battery cell. In a battery cell, electrode foils or layers, ie anodes and cathodes, are stacked on top of one another, with different electrode foils/layers being separated from one another by separator foils or a separator material. Battery cells with liquid or solid electrolytes (solid-state battery) are known.

A battery module includes, in particular, a plurality of battery cells which are electrically connected to one another in series or in parallel and are arranged in a module housing. Individual battery modules can also be electrically connected to one another in series or in parallel. A battery system includes a battery module or a plurality of battery modules.

The present battery cell is an ass battery cell (all-solid-state battery cell or solid-state battery cell), that is to say it comprises exclusively solid components (including semi-solid electrolytes, e.g. polymers), that is to say also a solid electrolyte. These solid electrolytes are placed between the electrodes as ion-conducting separators. These separators regularly consist of ceramic materials or of polymer, glass or hybrid materials. As with conventional ceramics, production takes place via a sintering process. The production takes place via the pressing (by stamp) of corresponding ceramic particles (beds) to form a green body and subsequent or parallel heating of the green body produced in this way. Here, the heating takes place via conduction and parallel discharge processes (sparks between the particles) which lead to a solidification of the green body (e.g. spark plasma sintering - SPS; also known under the name: field assisted sintering technique - FAST).

Due to the long process times and the discontinuity, this process is not suitable for series production. In addition, this process involves contact, which can lead to contamination of the stamps, which leads to inhomogeneous product surfaces in continuous operation. Due to the low layer thickness of ass separators, the conventional process and process management is very challenging.

The following processes are also used to manufacture ceramic separators: pulsed electric current sintering (PECS) and plasma pressure compaction (P2C).

From the DE 10 2007 057 129 A1 a method and a device for high-performance micromachining of a body or a layer of powder with a laser are known. A polygon scanner and a galvo resonance scanner are proposed for beam deflection.

From the U.S. 2017/0021454 A1 and 2017/0239724 A1 each disclose a method for the additive manufacturing of bodies by means of laser sintering.

The object of the present invention is to at least partially solve the problems cited with reference to the prior art. In particular, a method for producing a separator or a separator layer for a solid-state battery cell is to be proposed, which is suitable for mass production. It should therefore be possible to achieve a reproducible high quality with low costs at the same time.

A method with the features according to patent claim 1 and a separator or a separator layer with the features according to patent claim 10 contribute to the solution of these tasks. Advantageous developments are the subject matter of the dependent patent claims. The features listed individually in the patent claims can be combined with one another in a technologically meaningful manner and can be supplemented by explanatory facts from the description and/or details from the figures, with further embodiment variants of the invention being shown.

1. a) Bereitstellen einer Unterlage;
2. b) Anordnen eines Separatormaterials in Form eines Pulvermaterials oder als Grünling (bzw. als Schlicker) auf der Unterlage;
3. c) Beaufschlagen des Separatormaterials durch einen Laserstrahl und Bilden eines Separators bzw. einer Separatorschicht durch Sintern des Separatormaterials.

A method for producing a separator or a separator layer is proposed, which is used in a solid-state battery cell ectable or used. The separator or the separator layer is in particular a solid electrolyte. The production takes place by means of or by laser sintering. The procedure comprises at least the following steps:

1. a) providing a document;
2. b) arranging a separator material in the form of a powder material or as a green body (or as a slip) on the substrate;
3. c) applying a laser beam to the separator material and forming a separator or a separator layer by sintering the separator material.

The above (non-exhaustive) division of the method steps into a) to c) is primarily intended to serve only as a distinction and does not impose any order and/or dependency. The frequency of the process steps can also vary. It is also possible for method steps to at least partially overlap one another in terms of time. In particular, steps b) and c) are carried out at least partially simultaneously. Specifically, the steps are performed in the order listed.

In particular, during laser sintering, a compact powdery material layer or a green compact or slip is melted by a laser, with a homogeneous material, possibly with high density, being produced after the melt has solidified or been processed.

The ceramic powder material can be dispersed in a medium and then applied. This suspension is a slip. This makes particularly thin layers possible.

In particular, the separator material at least partially comprises a ceramic powder. The separator material can (also) comprise polymers, glass or hybrid materials.

The starting material connected to the separator or separator layer, ie a coherent body, a powder material or green body, is used as a solid body in a solid-state battery cell as a separator and electrolyte. The separator or the separator layer is arranged in the solid-state battery cell between the electrodes, ie the anodes and cathodes.

The substrate is in particular strip-shaped, so that the separator material can be arranged on it and processed by the laser beam. The documents can be provided newly and/or continuously for each manufacturing process. The base serves in particular to transport the separator material or to move it together in relation to the laser beam. The base can z. B. have a vacuum device for suction of the separator material.

The separator material can be arranged on the base as a powder material, slurry or green compact. A prior compression of the separator material is not absolutely necessary.

The separator material can be arranged in particular as a bulk powder on the base. For this purpose, a powdered separator material or the bulk powder is compacted or pressed, e.g. B. at least one stamp or two rollers. The individual particles of the powder then have a certain cohesion and thus form the green body.

The separator material is provided on the substrate, in particular with a constant thickness (extends in particular perpendicularly to the bearing surface of the substrate and in particular essentially parallel to the laser beam impinging on the separator material). The thickness can B. be adjusted via a rolling device and / or a doctor blade or a puller.

According to step c), the separator material is acted upon by a laser beam. The laser beam is generated in particular by a laser source and, if necessary, is directed onto the separator material via at least one deflection means. In particular, the laser beam is focused between the laser device and the separator material.

The laser beam strikes the separator material and at least partially melts it. As a result of the melting or sintering of the separator material, mutually contacting particles of the separator material bond, so that a line of coherent separator material is formed along the travel path of the laser beam and depending on the focussing. With the laser beam, the separator or the separator layer is formed from the separator material by melting it, which consists of particles bonded to one another.

In particular, the laser beam is directed onto the separator material via a deflection means, which is designed as a galvanometer scanner and/or a polygon scanner. These deflection means are known in principle. In a polygon scanner, a deflection means designed as a polygon rotates at an adjustable speed. With the polygon scanner, the laser beam can follow predetermined paths on the separator material with high repeatability and high frequency. In the case of a galvanometer scanner, the deflection means is pivoted (not rotated).

Due to the nature of the system, the course of the path or the scanning regime of the laser beam in relation to the separator material is always rasterized in a polygon scanner. The laser beam is deflected by the rotating movement of the polygon (rade).

By selectively switching the laser radiation on and off, synchronized with the movement of the polygon, almost any "straight line" vectors/paths with a defined length can be laser processed within the scanning field of the optics. With an additional movement of a galvanometer scanner, the processing lines or paths can be shifted vertically within the scan field, i.e. along the thickness of the separator material (on-the-fly sintering).

The laser beam emitted by the laser source is moved relative to the separator material, in particular by reflection on a rotating polygon, and preferably by means of an F-Theta objective which, in principle, z. B. also known as a scan lens or flat field lens is focused. The workpiece to be processed, the separator material, is located in the focus area of the laser beam. The irradiated material is sintered by the high intensities occurring in the focus. If necessary, the sintering process can be repeated several times until the desired degree of sintering is achieved (multiple passes).

The use of a polygon scanner for the method allows significantly higher beam deflection speeds compared to the method with other scanning systems (e.g. galvanometer scanner), so that the local exposure time of the laser radiation can be set precisely. As a rule, a higher laser power can be implemented in the process due to the higher scanning speed, so that the process rate (here the effective sintering speed) increases.

In particular, the amount of energy, z. B. by the multi-passes, can be precisely controlled, whereby an approximately optimal sintering depth (along the thickness of the separator material) can be adjusted. According to the current state of the art, all conventional processes (e.g. spark plasma sintering) in particular have significant deficits in terms of process speed and are therefore uneconomical for large series.

Furthermore, when using a polygon scanner, there is only little wear and tear on the beam deflection. In addition, the laser beam can remain switched on without interruption. In addition, there are no microstops or burns on the sides of the working area due to the way the beam is deflected. The polygon scanner therefore enables significantly higher process speeds, especially when passing over the separator material or the green compact several times. In addition, the energy input and the associated temperature profile can be adjusted in a more targeted manner by repeatedly passing over it (particularly important for direct sintering on the cathode or the anode).

Compared to the conventional sintering process for ass separators (e.g. spark plasma sintering), the process described here enables short process times, a continuous process, small thicknesses of the separator material and contactless processing of the separator material, which leads to low maintenance costs.

With the presently proposed processing of the separator material with a laser, an economical possibility for the implementation of the separator production in large series with almost perfect sintering results can be made available in particular for the first time.

• • eines der folgenden Sulfide: Li₂S-P₂S₅, Li₂S-SiS₂, Li₂S-GeS₂;
• • eines der folgenden Oxide: Li₇La₃Zr₂O₁₂ (LLZO) und Li_3xLa_2/3-3xTiO₃ (LLTO);
• • eines der folgenden Li-Argyrodite: Li₆PS₅X (mit X = CI, Br oder I), Li₇PS₆, Li₇PSe₆.

In particular, the separator material comprises at least one oxide or one sulfide or preferably at least one of the following materials:

• • one of the following sulphides: Li ₂ SP ₂ S ₅ , Li ₂ S-SiS ₂ , Li ₂ S-GeS ₂ ;
• • one of the following oxides: Li ₇ La ₃ Zr ₂ O ₁₂ (LLZO) and Li _3x La _2/3-3x TiO ₃ (LLTO);
• • one of the following Li argyrodites: Li ₆ PS ₅ X (where X = CI, Br or I), Li ₇ PS ₆ , Li ₇ PSe ₆ .

• • β-Li₃PS₄
• • Li₁₀SiP₂S₁₂
• • Li₁₀GeP₂S₁₂ mit LiH₂PO₄ Beschichtung zum Lithium
• • Für die Kathode Li_3.15Ge_0.15P_0.85S₄, als Separator: 77.5Li₂S-22.5P₂S₃
• • Für die Kathode: Li₁₀GeP₂S₁₂, als Separator und für die Anode:
  • • LiI-Li₂S-P₂S₅
  • • 80Li₂S-20P₂S₅
  • • Li₆PS₅Cl
  • • Li_6.6P_0.4Ge_0.6S₅I
  • • Li₃PS₄ glass
• • Für die Kathode: Li₁₀GeP₂S₁₂, als Separator:
  • • 70Li₂S-29P₂S₅-1P₂O₅
  • • Li_1.3Al_0.3Ti_1.7(PO₄)₃
  • • Li_6.6La₃Zr_1.6Ta_0.4O₁₂
  • • Composite of PEO-LiTFSI and Al-Li_6.75La₃Zr_1.75Ta_0.25O₁₂
  • • Composite of PBA-LiClO₄ and Li_1.5Al_0.5Ge_1.5(PO₄)₃
• • Für die Kathode: Li₇La₃Zr₂O₁₂, als Separator: PEO-LiTFSI
• • Für die Kathode: β-Li₃PS₄, als Separator:
  • • PEO-LiTFSI
  • • PEO-LiTFSI
  • • SI-PEO-LiTFSI
• • Zusätzliche Materialien:
  • • LiTi₂(Po₄)₃
  • • LiGe₂(PO4)₃
  • • Li₇La₃Zr₂O₁₂
  • • Li_3xLa_2/3-xTiO₃
  • • γ-Li₃PO₄
  • • Li₃N
  • • Li₄GeS₄
  • • Li₁₀GeP₂S₁₂
  • • Li₂S-P₂S₅
  • • Li₆PS_5X (X=Cl, Br, I)
  • • Li₃OX (X=Cl, Br, I)
  • • LiTi₂(PO₄)₃-AlPO₄
  • • Li_1+xAl_xTi_2-x(PO₄)₃
  • • Li₁₅Al_0.5Ge_1.5(PO₄)₃
  • • Li₇La₃Zr₂O₁₂

The following materials can be used as additional materials for a solid-state battery cell:

• • β-Li ₃ hp ₄
• • Li ₁₀ SiP ₂ S ₁₂
• • Li ₁₀ GeP ₂ S ₁₂ with LiH ₂ PO ₄ coating for lithium
• • For the cathode Li _3.15 Ge _0.15 P _0.85 S ₄ , as a separator: 77.5Li ₂ S-22.5P ₂ S ₃
• • For the cathode: Li ₁₀ GeP ₂ S ₁₂ , as a separator and for the anode:
  • • LiI-Li ₂ SP ₂ S ₅
  • • _80Li 2S-20P _{2S 5}
  • • Li ₆ HP ₅ Cl
  • • Li _6.6 P _0.4 Ge _0.6 S ₅ I
  • • Li ₃ PS ₄ glass
• • For the cathode: Li ₁₀ GeP ₂ S ₁₂ , as a separator:
  • _{• 70Li2S - 29P2S5-1P2O5 _}
  • • Li _1.3 Al _0.3 Ti _1.7 (PO ₄ ) ₃
  • • Li _6.6 La ₃ Zr _1.6 Ta _0.4 O ₁₂
  • • Composite of PEO-LiTFSI and Al-Li _6.75 La ₃ Zr _1.75 Ta _0.25 O ₁₂
  • • Composite of PBA-LiClO ₄ and Li _1.5 Al _0.5 Ge _1.5 (PO ₄ ) ₃
• • For the cathode: Li ₇ La ₃ Zr ₂ O ₁₂ , as a separator: PEO-LiTFSI
• • For the cathode: β-Li ₃ PS ₄ , as a separator:
  • • PEO LiTFSI
  • • PEO LiTFSI
  • • SI-PEO-LiTFSI
• • Additional Materials:
  • • LiTi ₂ (Po ₄ ) ₃
  • • LiGe ₂ (PO4) ₃
  • _{• Li7La3Zr2O12 _ _}
  • • Li _3x La _2/3-x TiO ₃
  • • γ-Li ₃ PO ₄
  • • Li ₃ N
  • • Li ₄ GeS ₄
  • • Li ₁₀ GeP ₂ S ₁₂
  • • Li ₂ SP ₂ S ₅
  • • Li ₆ PS _5X (X=Cl, Br, I)
  • • Li ₃ OX (X=Cl, Br, I)
  • • LiTi ₂ (PO ₄ ) ₃ -AlPO ₄
  • • Li _1+x Al _x Ti _2-x (PO ₄ ) ₃
  • • Li ₁₅ Al _0.5 Ge _1.5 (PO ₄ ) ₃
  • _{• Li7La3Zr2O12 _ _}

In the course of the sintering process, auxiliary materials (additional layers or additives) can also be sintered in parallel or in series. A combination of the materials listed above to form hybrid materials or composites is also possible.

In particular, the separator material is sintered by a plurality of passes of the laser beam. In this way, in particular, a local exposure time of the laser beam in the separator material can be precisely metered. In particular, the crossings can be made with a zero hatch distance.

The hatch distance refers in particular to the distance between mutually parallel exposure lines in a direction perpendicular to the surface of the separator material. In particular, the hatch distance is chosen so small that the particles of the different exposure lines are also sintered together.

In particular, the paths formed by the focused laser beam in the separator material by melting and cohesively connecting the particles run parallel to the surface of the separator material. In particular, a distance between two webs that are offset from one another along the thickness of the separator material is referred to as the hatch distance.

In particular, at least some of the crossings are carried out with a hatch distance greater than zero. A thickness of the separator material can thus be successively melted with each pass until the separator or the separator layer has a predetermined thickness.

In particular, the base is moved together with the separator material in relation to the laser beam along a feed direction. The feed direction runs essentially transversely to the thickness of the separator material and transversely to the laser beam impinging on the separator material.

In particular, the laser beam is directed onto the separator material via a galvanometer scanner or via a polygon scanner, and a coupling zone of the laser beam in the separator material is moved at least transversely to the feed direction. A path formed by the laser beam in the separator material by melting and cohesively connecting the particles thus runs essentially transversely to the feed direction.

In particular, the substrate is a cathode or anode layer of the solid-state battery cell. In particular, as a result of the precise arrangement of the paths formed by the laser beam in the separator material by melting and cohesively connecting the particles, melting or sintering of the cathode/anode layer arranged below the separator material can be avoided.

In particular, the laser beam is generated by a pulsed or continuous laser source and has a wavelength between 50 µm [microns] and 20 nm [nanometers]. The laser is designed, for example, as a pulsed (pulsed) or as a continuous (continuous wave, CW) fiber laser. Depending on the process speed or the necessary interaction time, the laser used can have an output of a few watts up to the double-digit kilowatt range.

A separator or a separator layer for a solid-state battery cell is proposed, the separator or the separator layer being produced by the method described. In particular, the separator produced in this way or the separator layer produced in this way can be identified by the characteristic paths of the melted separator material.

A battery cell is also proposed. The battery cell is in particular a solid-state battery cell and comprises at least the separator described or the separator layer described. The solid-state battery cell may include a cathode or anode on which a separator layer has been sintered (solid composite). The solid-state battery cell comprises at least one housing and at least one stack of electrode layers arranged one on top of the other arranged therein. The electrode layers are at least partially spaced apart from one another by the described separator or the separator layer.

In particular, the battery cell is used in a motor vehicle, in particular to provide electrical energy for a traction drive.

A processing system is also proposed which is designed to be suitable for producing the separator layer described and in particular for carrying out the method described.

The processing system comprises at least one laser source, a deflection means for deflecting the laser beam generated by the laser source towards the separator material, preferably a polygon, if necessary a focusing means for focusing the laser beam, e.g. B. an F-Theta lens and a base for supporting and for transporting the separator material or the separator or the separator layer.

In particular, the processing installation additionally has at least one system for data processing, which in particular has means that are suitably equipped, configured or programmed to carry out the method described or that execute the method.

The funds include B. a processor and a memory in which instructions to be executed by the processor are stored, as well as data lines or transmission devices which enable transmission of instructions, measured values, data or the like between the listed elements.

A computer program is also proposed, comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method described or the steps of the method described.

A computer-readable storage medium is also proposed, comprising instructions which, when executed by a computer, cause the computer to carry out the method described or the steps of the method described.

The statements on the method can be transferred in particular to the separator or the separator layer, the battery cell and the motor vehicle and the system for data processing and/or the computer-implemented method (i.e. the computer program and the computer-readable storage medium) and vice versa.

The use of indefinite articles (“a”, “an”, “an” and “an”), particularly in the claims and the description reflecting them, is to be understood as such and not as a numeral. Correspondingly introduced terms or components are to be understood in such a way that they are present at least once and in particular can also be present several times.

As a precaution, it should be noted that the numerals used here (“first”, “second”, ...) primarily (only) serve to distinguish between several similar objects, sizes or processes, i.e. in particular no dependency and/or sequence of these objects, sizes or make processes mandatory for each other. Should a dependency and/or order be required, this is explicitly stated here or it is obvious to the person skilled in the art when studying the specifically described embodiment. If a component can occur several times (“at least one”), the description of one of these components can apply equally to all or part of the majority of these components, but this is not mandatory.

• 1: eine Bearbeitungsanlage für das Verfahren;
• 2: einen Ausschnitt der Bearbeitungsanlage nach 1 in einer Seitenansicht im Schnitt;
• 3: den Ausschnitt nach 2 in einer Draufsicht;
• 4: eine Bearbeitungsanlage mit Polygonscanner in perspektivischer Ansicht; und
• 5: eine Bearbeitungsanlage mit Galvanometerscanner in perspektivischer Ansicht.

The invention and the technical environment are explained in more detail below with reference to the accompanying figures. It should be pointed out that the invention should not be limited by the exemplary embodiments given. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description. In particular, it should be pointed out that the figures and in particular the proportions shown are only schematic. Show it:

• 1 : a processing facility for the process;
• 2 : a section of the processing plant 1 in a side view in section;
• 3 : the snippet after 2 in a plan view;
• 4 : a processing system with a polygon scanner in a perspective view; and
• 5 : a perspective view of a processing system with a galvanometer scanner.

the 1 shows a processing system 9 for the method. The processing system 9 comprises a laser source 8, a deflection means 5 for deflecting the laser beam 4 generated by the laser source 8 towards the separator material 3, a focusing means 10 for focusing the laser beam 4, e.g. B. an F-Theta lens and a base 2 for supporting and for transporting the separator material 3 or the separator layer 1 along a feed direction 7. The base 2 is formed on the one hand by an electrode layer 12 designed as a cathode or anode, on which according to step b) the separator material 3 is arranged as a green compact. On the other hand, the base 2 is designed as a conveyor belt (with a carrier film that has to be removed again later), which is driven via rollers 15 and transmits a feed to the electrode layer 12 and the separator material 3 arranged thereon.

The conveyor belt is connected to a vacuum device 14 so that the electrode layer 12 and the separator material 3 are firmly arranged on the base 2 . The processing system 9 is controlled by a system 11 for data processing.

The separator material 3 is arranged on the base 2 as a powdered material or green compact. According to step c), the separator material 3 is acted upon by a laser beam 4 . The laser beam 4 is generated by a laser source 8 and directed onto the separator material 3 via a deflection means 5 . The laser beam 4 is focused between the deflection means 5 and the separator material 3.

The laser beam 4 strikes the separator material 3 and at least partially melts it. As a result of the melting or sintering of the separator material 3, mutually contacting particles of the separator material 3 combine, so that a line of coherent separator material 3 is formed along the travel path of the laser beam 4 and depending on the focusing. The separator/separator layer 1 is thus formed by melting the separator material 3 with the laser beam 4 and consists of particles bonded to one another.

2 shows a section of the processing system 9 1 in a side view in section. 3 shows the section 2 in a top view. the 2 and 3 are described together below. To the remarks 1 is referenced.

The substrate 2 is formed by an electrode layer 12 designed as a cathode or anode, on which the separator material 3 is arranged as a green compact in accordance with step b). The laser beam 4 strikes the separator material 3 and melts it. As a result of the melting or sintering of the separator material 3, mutually contacting particles of the separator material 3 combine, so that a line or path 16 of coherent separator material 3 is formed along the travel path of the laser beam 4 and depending on the focusing. The separator/separator layer 1 is thus formed by melting the separator material 3 with the laser beam 4 and consists of particles bonded to one another.

By selectively switching the laser radiation on and off, synchronized with the movement of the polygon, almost any “straight” vectors/paths 16 with a defined length 17 can be laser-processed within the scanning field of the optics. An additional movement of a galvanometer scanner allows the processing lines or tracks 16 to be shifted vertically within the scanning field, ie along the thickness 13 of the separator material 3 (on-the-fly sintering).

The separator material 3 is sintered by a plurality of passes of the laser beam 4 . A local exposure time of the laser beam 4 in the separator material 3 can thus be precisely metered.

At least some of the crossings are carried out with a hatch distance 6 greater than zero. A thickness 13 of the separator material 3 can thus be successively melted with each pass until the separator/the separator layer 1 has a predetermined thickness 13 .

The hatch distance 6 designates the distance between mutually parallel exposure lines/paths 16 in a direction perpendicular to the surface of the separator material 3 .

The substrate 2, together with the separator material 3, is placed opposite the laser beam 4 moves along a feed direction 7 . The feed direction 7 runs essentially transversely to the thickness 13 of the separator material 3 and transversely to the laser beam 4 impinging on the separator material 3.

4 shows a processing system 9 with a polygon scanner as a deflection means 5 in a perspective view. The laser beam 4 emitted by the laser source 8 is moved relative to the separator material 3 by reflection on a rotating polygon of the polygon scanner and is focused by means of an F-Theta lens as a focusing means 10 . The workpiece to be processed, the separator material 3, is located in the focus area of the laser beam 4. The irradiated material is sintered by the high intensities occurring in the focus. If necessary, the sintering process can be repeated several times until the desired degree of sintering is achieved (multiple passes).

5 shows a processing system 9 with a galvanometer scanner in a perspective view. The laser beam 4 emitted by the laser source 8 is moved in relation to the separator material 3 by reflection on a pivotable reflector of the galvanometer scanner and is focused by means of an F-Theta lens as a focusing means 10 . The workpiece to be processed, the separator material 3, is located in the focus area of the laser beam 4. The irradiated material is sintered by the high intensities occurring in the focus. In the case of a galvanometer scanner, the deflection means 5 pivots (not rotates).

reference list

1

separator (separator layer)

2

document

3

separator material

4

laser beam

5

deflection means

6

hatch distance

7

feed direction

8th

laser source

9

processing plant

10

focusing means

11

system

12

electrode location

13

thickness

14

vacuum device

15

role

16

Rail

17

length

QUOTES INCLUDED IN DESCRIPTION

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

Patent Literature Cited

• DE 102007057129 A1 [0008]
• US20170021454A1 [0009]

Claims (10)

Method for producing a separator (1), which can be used in a solid-state battery cell, by means of laser sintering; comprising at least the following steps: a) providing a base (2); b) arranging a separator material (3) in the form of a powder material or as a green compact on the base (2); c) applying a laser beam (4) to the separator material (3) and forming a separator (1) by sintering the separator material (3). procedure after Claim 1 , wherein the laser beam (4) is directed onto the separator material (3) via a deflection means (5) that is designed as a galvanometer scanner or a polygon scanner. Method according to one of the preceding claims, wherein the separator material (3) comprises at least one oxide or one sulfide or at least one of the following materials: • one of the following sulfides Li ₂ SP ₂ S ₃ , Li ₂ S-SiS ₂ , Li ₂ S- GeS ₂ ; • one of the following oxides Li ₇ La ₃ Zr ₂ O ₁₂ (LLZO) and Li _3x La _2/3-3x TiO ₃ (LLTO); • one of the following Li argyrodites Li ₆ PS ₅ X (where X = CI, Br or I), Li ₇ PS ₆ , Li ₇ PSe ₆ . Method according to one of the preceding claims, wherein the separator material (3) is sintered by a plurality of passes of the laser beam (4). procedure after patent claim 4 , wherein at least some of the crossings are carried out with a hatch distance (6) greater than zero. Method according to one of the preceding patent claims, in which the base (2) together with the separator material (3) is moved in relation to the laser beam (4) along a feed direction (7). procedure after claim 6 , wherein the laser beam (4) is directed onto the separator material (3) via a deflection means (5) and a coupling zone of the laser beam (4) in the separator material (3) is moved at least transversely to the feed direction (7). Method according to one of the preceding claims, wherein the substrate (2) is a cathode or anode layer of the solid-state battery cell. Method according to one of the preceding patent claims, in which the laser beam (4) is generated by a pulsed or continuous laser source (8) and has a wavelength of between 50 µm and 320 nm. Separator (1) for a solid-state battery cell, the separator (1) being produced by a method according to one of the preceding claims.

Images