Device for peeling off electrode protective layer, and method for peeling off electrode protective layer using same

Abstract

The present invention relates to a device for peeling off a protective layer exposed on the upper part of an electrode, and a method for peeling off an electrode protective layer using same. More specifically, the peeling device of the present invention comprises: a tape supply unit for supplying a peeling tape; a peeling unit for bringing the peeling tape into close contact with the upper surface of the protective layer and driving the peeling tape, which is in close contact with the protective layer, wherein the peeling unit comprises at least one of a peeling roller or a peeling knife; and a tape recovery unit for recovering the peeling tape.

Description

Electrode protective layer peeling device and electrode protective layer peeling method using the same

[0001] The present invention relates to a device for peeling a protective layer of an electrode for an all-solid-state battery and a method for peeling a protective layer of an electrode for an all-solid-state battery using the same.

[0002] The recent rapid proliferation of battery-powered electronic devices, such as mobile phones, laptops, and electric vehicles, has led to a rapid increase in demand for high-energy density, high-capacity secondary batteries. Accordingly, active research and development is underway to improve the performance of lithium secondary batteries.

[0003] A lithium secondary battery is a battery that includes a positive electrode and a negative electrode that contain active materials capable of intercalating and deintercalating lithium ions, and an electrolyte, and produces electrical energy through oxidation and reduction reactions when lithium ions are intercalated / deintercalated from the positive electrode and negative electrode.

[0004] The problem to be solved by the present invention is to provide a device capable of peeling off a protective layer coated on the upper surface of an electrode for an all-solid-state battery.

[0005] Another problem to be solved by the present invention is to provide a method for peeling off a protective layer coated on the upper surface of an electrode for an all-solid-state battery.

[0006]

[0007] An electrode protective layer peeling device according to the concept of the present invention is a device for peeling a protective layer exposed on an upper portion of an electrode, the device including: a tape supply unit configured to supply a peeling tape; a peeling unit configured to contact the peeling tape to an upper surface of the protective layer and to travel the peeling tape contacted to the protective layer; the peeling unit including at least one of a peeling roller and a peeling knife; and a tape recovery unit configured to recover the peeling tape. The peeling unit allows the peeling tape to travel in a state of being contacted with the protective layer, whereby the peeling unit can peel the protective layer from the electrode.

[0008] A method for peeling off an electrode protective layer according to another concept of the present invention may include: unwinding a peeling tape wound on a tape supply roll and running it to a peeling unit; using the peeling unit to run the peeling tape while contacting the upper surface of the protective layer of the electrode; using the peeling unit to change the running direction of the peeling tape so that the end of the peeling tape is bent and raised; and rewinding the peeling tape to a tape recovery roll.

[0009]

[0010] The peeling device of the present invention can rapidly peel off a protective layer without damaging a solid electrolyte layer in an all-solid-state battery electrode. Specifically, the peeling device of the present invention can rapidly peel off a protective layer without damaging the brittle solid electrolyte layer in an all-solid-state battery electrode comprising: an electrode active material layer; a solid electrolyte layer on the electrode active material layer; and a protective layer on the solid electrolyte layer.

[0011] The peeling method of the present invention can rapidly peel off a protective layer without damaging a solid electrolyte layer in an all-solid-state battery electrode. Specifically, in an all-solid-state battery electrode comprising an electrode active material layer; a solid electrolyte layer on the electrode active material layer; and a protective layer on the solid electrolyte layer, the protective layer can be rapidly peeled off without damaging the brittle solid electrolyte layer.

[0012]

[0013] Figure 1 is a schematic diagram illustrating an electrode protective layer peeling device for an all-solid-state battery of the present invention.

[0014] Figure 2 is a cross-sectional view illustrating a peeling unit according to one embodiment of the present invention.

[0015] FIG. 3 is a cross-sectional view illustrating a peeling unit according to another embodiment of the present invention.

[0016] FIG. 4 is a cross-sectional view illustrating a peeling unit according to another embodiment of the present invention.

[0017] FIGS. 5A and 5B are cross-sectional views illustrating a peeling knife according to one embodiment of the present invention.

[0018] Figures 6 to 10 are cross-sectional views illustrating the process of using a peeling unit to adhere a peeling tape to the upper surface of the protective layer of an electrode and drive it.

[0019] Figure 11 is a cross-sectional view of an all-solid-state battery according to one embodiment of the present invention.

[0020]

[0021] To fully understand the structure and effects of the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and subject to various modifications. However, the description of these embodiments is provided solely to ensure a complete disclosure of the present invention and to fully inform those skilled in the art of the invention of the scope of the invention.

[0022] In this specification, when a component is referred to as being on another component, it means that it can be formed directly on the other component, or a third component may be interposed between them. Furthermore, in the drawings, the thicknesses of the components are exaggerated for the sake of clarity. Parts designated by the same reference numerals throughout the specification represent the same components.

[0023] Unless otherwise specified herein, the singular may also include the plural. Furthermore, unless otherwise specified, "A or B" may mean "including A, including B, or including A and B." As used herein, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components.

[0024] As used herein, “combination thereof” may mean mixtures, laminates, composites, copolymers, alloys, blends, and reaction products of the components.

[0025] In an all-solid-state battery electrode including a current collector; an active material layer on the current collector; and a solid electrolyte layer on the active material layer, if the solid electrolyte layer is positioned at the uppermost surface and exposed to the outside, the solid electrolyte may be damaged, thereby reducing battery performance. Specifically, during processes such as transport of the electrode, the solid electrolyte layer exposed on the surface may react with water, oxygen, etc., thereby damaging electrochemical properties, and the resulting byproducts may reduce ionic conductivity, thereby reducing battery performance. To prevent this, the surface of the solid electrolyte layer may be coated to form an electrode protective layer, thereby preventing damage to the solid electrolyte layer during processes such as transport.

[0026] Meanwhile, the electrode protective layer is a component that generally must be removed before assembling the all-solid-state battery, and it is important to remove the electrode protective layer without damaging the solid electrolyte layer.

[0027] In particular, since the solid electrolyte layer is brittle when it contains a sulfide-based solid electrolyte, the solid electrolyte layer may be damaged when the electrode protective layer is scraped off using a tool such as a blade or scraper.

[0028] By using the electrode protective layer peeling device and peeling method according to one embodiment of the present invention, the electrode protective layer can be quickly peeled without damaging the solid electrolyte layer.

[0029] Hereinafter, the electrode protective layer peeling device of the present invention will be described in detail.

[0030] Figure 1 is a schematic diagram illustrating an electrode protective layer peeling device for an all-solid-state battery of the present invention.

[0031] Referring to FIG. 1, the electrode protective layer peeling device (PEA) of the present invention includes a tape supply unit (TSU); a peeling unit (PEU); and a tape recovery unit (TRU).

[0032] A tape supply unit (TSU) may be configured to supply a peeling tape (PTP). Specifically, the tape supply unit (TSU) may include a tape supply roll (TSR). The peeling tape may be supplied by unwinding the peeling tape (PTP) wound on the tape supply roll (TSR).

[0033] In one embodiment, the release tape (PTP) may include a base layer (BAL) and an adhesive layer (ADL) on the base layer (BAL). The adhesive layer (ADL) of the release tape (PTP) may adhere to a protective layer (PRL) of an electrode (ELT) to peel the protective layer (PRL) from the electrode (ELT).

[0034] In one embodiment, the tape supply unit (TSU) may further include a plurality of first guide rollers (GUR1). The plurality of first guide rollers (GUR1) may adjust the running direction of the peeling tape (PTP). For example, the first guide rollers (GUR1) may be idle rollers.

[0035] Although not shown, the tape supply unit (TSU) may further include a supply roll replacement unit. In one embodiment, the supply roll replacement unit may be configured to detect a remaining amount of peel tape (PTP) of the tape supply roll (TSR) and replace the tape supply roll (TSR) when the peel tape (PTP) is below a reference value. The supply roll replacement unit may include a sensor configured to detect a remaining amount of peel tape (PTP). For example, the sensor may detect a diameter of the peel tape (PTP) wound around the tape supply roll (TSR), thereby determining the remaining amount of peel tape (PTP).

[0036] Although not shown, the tape supply unit (TSU) may further include a control unit configured to control the supply roll replacement unit. The control unit may be configured to collect peel tape (PTP) remaining amount information obtained through the supply roll replacement unit and control the operation of the supply roll replacement unit.

[0037] Referring back to FIG. 1, the tape recovery unit (TRU) may be configured to recover the peel tape (PTP). Specifically, the tape recovery unit (TRU) may include a tape recovery roll (TRR). The peel tape (PTP) unwound from the tape supply roll (TSR) may be wound onto the tape recovery roll (TRR) via the peel unit (PEU) described below. A protective layer (PRL) of an electrode described below is adhered to the peel tape (PTP), so that the peel tape (PTP) and the protective layer (PRL) may be wound together onto the tape recovery roll (TRR).

[0038] In one embodiment, the tape recovery unit (TRU) may further include a plurality of second guide rollers (GUR2). The plurality of second guide rollers (GUR2) may adjust the running direction of the peeling tape (PTP). For example, the second guide roller (GUR2) may be an idle roller.

[0039] Although not shown, the tape recovery unit (TRU) may further include a recovery roll replacement unit. In one embodiment, the recovery roll replacement unit may be configured to detect the amount of peel tape (PTP) wound on the tape recovery roll (TRR) and replace the tape recovery roll (TRR) in which the peel tape (PTP) is wound more than a reference amount. The recovery roll replacement unit may include a sensor configured to detect the amount of peel tape (PTP) wound.

[0040] Although not shown, the tape recovery unit (TRU) may further include a control unit configured to control the recovery roll replacement unit. The control unit may be configured to collect information on the amount of peel tape (PTP) obtained through the recovery roll replacement unit and control the operation of the supply roll replacement unit.

[0041] In one embodiment, the peel tape (PTP) unwinding speed of the tape supply roll (TSR) can be synchronized with the peel tape (PTP) winding speed of the tape return roll (TRR).

[0042] Referring again to FIG. 1, the peeling unit (PEU) may be configured to pass a running peeling tape (PTP) through the protective layer (PRL) of the electrode (ELT) in close contact therewith. As a result, the protective layer (PRL) may be peeled from the electrode (ELT). The peeled protective layer (PRL) may be attached to the peeling tape (PTP) and recovered by the tape recovery unit (TRU).

[0043] In one embodiment, the peeling unit (PEU) includes at least one of a peeling roller (PRO) and a peeling knife (PKN), and the peeling unit (PEU) may further include a frame (PRM) supporting the peeling roller (PRO) and the peeling knife (PKN).

[0044] The peeling roller (PRO) and the peeling knife (PKN) may be configured to adhere the peeling tape (PTP) to the electrode (ELT). In one embodiment, the peeling roller (PRO) may be configured to adhere the peeling tape (PTP) to the upper surface of the protective layer (PRL). As a result, the protective layer (PRL) may be adhered to the adhesive layer (ADL) of the peeling tape (PTP).

[0045] Additionally, the peeling roller (PRO) can rotate clockwise or counterclockwise depending on the running direction of the peeling tape (PTP). By rotating, the peeling roller (PRO) can assist in the smooth running of the peeling tape (PTP). The peeling roller (PRO) can contribute to the unwinding of the peeling tape (PTP) from the tape supply roll (TSR).

[0046] In one embodiment, the rotation speed of the peel roller (PRO) can be synchronized with the speed of unwinding the peel tape (PTP) of the tape supply roll (TSR) or the speed of winding the peel tape (PTP) of the tape return roll (TRR).

[0047] The peeling knife (PKN) includes a flat surface (FLS) that faces the protective layer (PRL) of the electrode (ELT). By having the flat surface (FLS), the peeling knife (PKN) can increase the contact area between the peeling tape (PTP) and the protective layer (PRL), and consequently, can increase the adhesive strength between the peeling tape (PTP) and the protective layer (PRL).

[0048] A peeling knife (PKN) may include an inclined surface (ICS) adjacent to a flat surface (FLS). A peeling tape (PTP) having a protective layer (PRL) adhered thereto may be withdrawn along the inclined surface, thereby causing the protective layer (PRL) to be peeled off along the inclined surface. For example, the peeling tape (PTP) having a protective layer (PRL) adhered thereto may bend toward the inclined surface (ISC), and stress may be concentrated at the bent portion of the peeling tape (PTP), thereby allowing the remaining portion of the protective layer (PRL) to be easily peeled off from the electrode (ELT).

[0049] The peel knife (PKN) may have a peel angle (x), which is the internal angle formed by the intersection of the flat surface (FLS) and the inclined surface (ICS). The peel angle may be less than 90°, and specifically may be between 30° and 80°.

[0050] FIG. 2 is a cross-sectional view illustrating a peeling unit (PEU) according to one embodiment.

[0051] Referring to FIG. 2, the peeling unit (PEU) may include a peeling roller (PRO). As described above, the peeling roller (PRO) may allow the peeling tape (PTP) passing through it to adhere to the upper surface of the protective layer (PRL). In addition, the peeling roller (PRO) may assist in the smooth running of the peeling tape (PTP) by rotating.

[0052] FIG. 3 is a cross-sectional view illustrating a peeling unit (PEU) according to another embodiment.

[0053] Referring to FIG. 3, the peeling unit (PEU) may include both a peeling roller (PRO) and a peeling knife (PKN). Specifically, the peeling unit (PEU) may include a peeling knife (PKN) and peeling rollers (PRO) adjacent to the peeling knife (PKN). The peeling roller (PRO) helps to smoothly supply the peeling tape (PTP), and the peeling knife (PKN) increases the contact area between the peeling tape (PTP) and the protective layer (PRL), thereby allowing the protective layer (PRL) to be peeled more quickly and cleanly.

[0054] As an example, referring to FIG. 3, the peeling knife (PKN) is positioned between the peeling rollers (PRO), so that the peeling tape (PTP) may not be bent toward the inclined surface of the peeling knife (PKN). As an example, referring to FIGS. 1 and 3, the running direction of the peeling tape (PTP) may be changed by the peeling roller (PRO) and the second guide roller (GUR2), so that the protective layer (PRL) adhered to the peeling tape (PTP) may be peeled from the electrode (ELT).

[0055]

[0056] FIG. 4 is a cross-sectional view illustrating a peeling unit (PEU) according to another embodiment.

[0057] Referring to Fig. 4, the peeling unit (PEU) may include both a peeling roller (PRO) and a peeling knife (PKN). Specifically, the peeling knife (PKN) may be positioned so as to be at the frontmost position in the direction in which the electrode (ELT) passes. The peeling roller (PRO) helps to smoothly supply the peeling tape (PTP), and the peeling knife (PKN) increases the contact area between the peeling tape (PTP) and the protective layer (PRL), so that the protective layer (PRL) can be peeled off more quickly and cleanly. Furthermore, the inclined surface of the peeling tape (PTP) causes the peeling tape (PTP) to which the protective layer (PRL) is adhered to to bend toward the inclined surface (ISC), and stress is concentrated at the bent portion, so that the remaining portion of the protective layer (PRL) can be peeled off from the electrode (ELT).

[0058] Figures 5a and 5b are cross-sectional views illustrating a peeling knife.

[0059] Referring to FIGS. 5A and 5B, the flat surface (FLS) of the peeling knife (PKN) may have a length L2 in the first direction (D1). The flat surface (FLS) of the peeling knife (PKN) may have a width W2 in the second direction (D2). The protective layer (PRL) of the electrode (ELT) may have a length L1 in the first direction (D1). The protective layer (PRL) of the electrode (ELT) may have a width W1 in the second direction (D2).

[0060] In one embodiment, referring to FIG. 5a, L2 may be smaller than L1.

[0061] In one embodiment, referring to FIG. 5b, W2 may be substantially equal to W1, or W2 may be greater than W1.

[0062] Referring again to FIG. 1, the peeling unit (PEU) may further include a drive unit (DRP) that moves the peeling roller (PRO) and the peeling knife (PKN) vertically or horizontally.

[0063] The drive unit (DRP) may include a horizontal drive unit (HDP) and a vertical drive unit (VDP).

[0064] In one embodiment, the vertical drive (VRP) may be configured to raise and lower the peel roller (PRO) and the peel knife (PKN). The vertical drive (VRP) may lower the peel roller (PRO) and the peel knife (PKN) so that the peel tape (PTP) passing through the peel roller (PRO) or the peel knife (PKN) contacts the upper surface of the protective layer (PRL).

[0065] In one embodiment, the horizontal drive unit (HDP) may be configured to horizontally move the peeling roller (PRO) and the peeling knife (PKN) to pass through the upper surface of the protective layer (PRL). For example, the peeling roller may be driven in a first direction (D1).

[0066] Referring to FIG. 1, the electrode protective layer stripping device (PEA) of the present invention may further include a stripping table (TBL). An electrode (ELT) may be provided on the stripping table (TBS).

[0067] The protective layer (PRL) of the electrode (ELT) mounted on the stripping table (TBS) can be stripped by the stripping unit (PEU) described above.

[0068] In one embodiment, the stripping table (TBS) may include a transport belt. The transport belt may be configured to move an electrode (ELT). The direction of movement of the electrode (ELT) may coincide with the direction of movement of a stripping tape (PTP) passing through a stripping roller (PRO) or a stripping knife (PKN).

[0069] For example, a peeling tape (PTP) passing through a peeling roller (PRO) or a peeling knife (PKN) may run in a first direction (D1), and the transport belt may run an electrode (ELT) in the first direction (D1).

[0070] The electrode protective layer peeling device (PEA) of the present invention is configured such that a peeling roller (PRO) or a peeling knife (PKN) passes through the upper surface of the electrode (ELT).

[0071] In one embodiment, the horizontal drive unit (HDP) of the peeling unit (PEU) horizontally moves the peeling roller (PRO) or the peeling knife (PKN) as described above, so that the peeling roller (PRO) or the peeling knife (PKN) can pass over the upper surface of the electrode (ELT). In another embodiment, the transport belt of the peeling table (TBS) drives the electrode (ELT), so that the peeling roller (PRO) or the peeling knife (PKN) can pass over the upper surface of the electrode (ELT).

[0072] In one embodiment, a peel tape (PTP) that is unwound from a tape supply roll (TRR) and rewound to a tape return roll (TSR) is driven at a running speed V T can have a running speed V of the peeling tape (PTP) T is the speed V at which the peeling roller (PRO) or peeling knife (PKN) passes the upper surface of the electrode (ELT). p It can be larger. Because of this, V T Go V p By having a larger value, the peeling of the protective layer (PRL) can be performed smoothly.

[0073]

[0074] Hereinafter, the electrode protective layer peeling method of the present invention will be described.

[0075] In one embodiment, the electrode protective layer peeling method of the present invention can be performed by an electrode protective layer peeling device (PEA) described with reference to FIG. 1.

[0076] In one embodiment, a method for peeling an electrode protective layer may include unwinding a peeling tape (PTP) wound on a tape supply roll (TSR) and running it to a peeling unit (PEU); using the peeling unit (PEU) to cause the peeling tape (PTP) to come into close contact with an upper surface of a protective layer (PRL) of an electrode (ELT) and run it; using the peeling unit (PEU) to change the running direction of the peeling tape (PTP) so that an end of the peeling tape (PTP) is bent and raised; and rewinding the peeling tape (PTP) and the protective layer (PRL) attached to the peeling tape (PTP) to a tape recovery roll (TRR). By running the peeling tape (PTP) in a state in which it is in close contact with the protective layer (PRL), the protective layer (PRL) can be peeled from the electrode (ELT).

[0077] In one embodiment, the electrode (ELT) may include a current collector (COL); an active material layer (AML) on the current collector (COL); a solid electrolyte layer (SEL) on the active material layer (AML); and a protective layer (PRL) on the solid electrolyte layer (SEL). The protective layer (PRL) is positioned on the upper portion of the electrode (ELT), and an upper surface of the protective layer (PRL) may be exposed.

[0078] In one embodiment, the current collector (COL); the active material layer (AML); and the solid electrolyte layer (SEL) may be, in order, a positive electrode current collector (110); a positive electrode active material layer (120); and a positive electrode solid electrolyte layer (310), which will be described later. Alternatively, the current collector (COL); the active material layer (AML); and the solid electrolyte layer (SEL) may be, in order, a negative electrode current collector (210); a negative electrode active material layer (220); and a negative electrode solid electrolyte layer (320).

[0079] In one embodiment, the solid electrolyte layer (SEL) may include a sulfide-based solid electrolyte, which will be described later. By including the sulfide-based solid electrolyte, the solid electrolyte layer (SEL) may be brittle.

[0080] In one embodiment, the peeling tape (PTP) may include a base layer (BAL) and an adhesive layer (ADL) on the base layer (BAL). The adhesive strength of the adhesive layer (ADL) is not particularly limited as long as it can peel the protective layer (PRL) from the electrode (ELTPRL). For example, the adhesive strength of the adhesive layer (ADL) may be 200 gf or more.

[0081] The material of the protective layer (PRL) is not particularly limited as long as it does not react with the components of the solid electrolyte layer (SEL). In one embodiment, the material of the protective layer (PRL) may include one or more metals selected from the group consisting of aluminum, titanium, chromium, nickel, and tin. As an example, the material of the protective layer (PRL) may be aluminum.

[0082] Figures 6 to 10 are cross-sectional views for explaining in detail how to drive a peeling tape (PTP) by adhering it to the upper surface of the protective layer (PRL) of an electrode (ELT) using a peeling unit (PEU).

[0083] In one embodiment, referring to FIG. 6, the method of driving the peeling tape (PTP) to adhere to the upper surface of the protective layer (PRL) of the electrode (ELT) using the peeling unit (PEU) may include lowering the peeling roller (PRO) and the peeling knife (PKN). In one embodiment, the lowering of the peeling roller (PRO) and the peeling knife (PKN) may be performed by the vertical driving unit (VDP) and the control unit described with reference to FIG. 1.

[0084] In one embodiment, the method of applying a peeling tape (PTP) to the upper surface of a protective layer (PRL) of an electrode (ELT) using a peeling unit (PEU) may include passing the electrode (ELT) adjacent to the lower end of a peeling roller (PRO) and a peeling knife (PKN).

[0085] In one embodiment, passing the electrode (ELT) adjacent to the lower end of the peeling roller (PRO) and the peeling knife (PKN) may include moving the electrode (ELT) in a first direction (D1). Moving the electrode (ELT) in the first direction (D1) may be performed by the peeling table (TBL) described with reference to FIG. 1. For example, the electrode (ELT) may be moved in the first direction (D1) using a transport belt of the peeling table (TBL).

[0086] In another embodiment, passing the electrode (ELT) under the peeling roller (PRO) and the peeling knife (PKN) may include horizontally moving the peeling roller (PRO) and the peeling knife (PKN) in the first direction (D1). Horizontally moving the peeling roller (PRO) and the peeling knife (PKN) in the first direction (D1) may be performed by the horizontal driving unit (HDP) described with reference to FIG. 1. For example, by directly moving the peeling roller (PRO) and the peeling knife (PKN) in the first direction (D1), the same effect as driving the electrode (ELT) in the first direction (D1) may be achieved.

[0087] In one embodiment, a peel tape (PTP) that is unwound from a tape supply roll (TRR) and rewound to a tape return roll (TSR) is driven at a running speed V T can have a running speed V of the peeling tape (PTP) T is the speed V at which the electrode (ELT) passes the peeling roller (PRO) or peeling knife (PKN) through the bottom of the electrode (ELT). p may be greater. In other words, the running speed of the peeling tape (PTP) may be greater than the speed at which the peeling roller (PRO) or peeling knife (PKN) passes over the upper surface of the electrode (ELT).

[0088] Referring to FIGS. 7 and 8, the protective layer (PRL) of the electrode (ELT) passing adjacent to the lower end of the peeling roller (PRO) and the peeling knife (PKN) comes into contact with the peeling tape (PTP).

[0089] The peeling roller (PRO) can rotate clockwise or counterclockwise depending on the running direction of the peeling tape (PTP). By rotating, the peeling roller (PRO) can facilitate the running of the peeling tape (PTP).

[0090] The peeling knife (PKN) has a flat surface (FLS), which can increase the contact area between the peeling tape (PTP) and the protective layer (PRL), and consequently, increase the adhesive strength between the peeling tape (PTP) and the protective layer (PRL). However, this can slow down the running speed of the peeling tape (PTP). As described above, the peeling roller (PRO) can prevent the reduction in running speed of the peeling tape (PTP) caused by the peeling knife (PKN).

[0091] Referring to FIGS. 8 and 9, the peeling knife (PKN) can change the running direction of the peeling tape (PTP) so that the end of the peeling tape is bent upward.

[0092] The peel tape (PTP) can be bent along the inclined surface (ICS) of the peel knife (PKN), and the stress is concentrated at the bent portion of the peel tape (PTP), so that the remaining portion of the protective layer (PRL) can be easily peeled from the electrode (ELT).

[0093] The peel angle (x), which is the internal angle formed by the intersection of the flat surface (FLS) and the inclined surface (ICS) of the peeling knife (PKN), may be less than 90°. In other words, the peel angle (x) formed by the end of the bent peeling tape (PTP) and the remaining part of the peeling tape (PTP) may be less than 90°. Specifically, the peel angle (x) may be 30° to 80°. By having the above angle, the protective layer (PRL) can be peeled more cleanly.

[0094] Referring to FIG. 10, the peeled protective layer (PRL) may be wound onto a tape recovery roll (TRR) together with the peeling tape (PTP) while being attached to the peeling tape (PTP).

[0095] The electrode (ELT) with the protective layer (PRL) removed can be used for assembling an all-solid-state battery.

[0096] Fig. 11 is a cross-sectional view illustrating an all-solid-state battery according to one embodiment.

[0097] Referring to FIG. 11, the all-solid-state battery (CEL) may include a cathode layer (200); a solid electrolyte layer (300) on the cathode layer (200); and a cathode layer (100) on the solid electrolyte layer (300).

[0098] The positive electrode layer (100) may include a positive electrode current collector (110) and a positive electrode active material layer (120) disposed on the positive electrode current collector (110). The positive electrode active material layer (120) may include a positive electrode active material, a solid electrolyte, a conductive material, and a binder.

[0099] The positive electrode current collector (110) can provide a reference surface on which the positive electrode active material layer (120) is arranged. The positive electrode current collector (110) can include a plate or foil including, for example, indium (In), copper (Cu), magnesium (Mg), stainless steel, titanium (Ti), iron (Fe), cobalt (Co), nickel (Ni), zinc (Zn), aluminum (Al), germanium (Ge), lithium (Li), or an alloy thereof.

[0100] Meanwhile, unlike as illustrated in FIG. 110, in one embodiment of the present invention, the positive electrode current collector (110) may be omitted. Although not illustrated, a carbon layer having a thickness of 0.1 μm to 4 μm may be additionally disposed between the positive electrode current collector (110) and the positive electrode active material layer (120) to increase the bonding strength between the positive electrode current collector (110) and the positive electrode active material layer (120).

[0101] The cathode active material may include a material that can reversibly absorb and desorb lithium ions. The cathode active material may include a plurality of particles. The cathode active material may include, but is not necessarily limited to, lithium transition metal oxides such as lithium cobalt oxide (LCO), lithium nickel oxide, lithium nickel cobalt oxide, lithium nickel cobalt aluminum oxide (NCA), lithium nickel cobalt manganese oxide (NCM), lithium manganate, and lithium iron phosphate, nickel sulfide, copper sulfide, lithium sulfide, iron oxide, or vanadium oxide. The cathode active materials may be used alone or as a mixture of two or more.

[0102] Lithium transition metal oxides include, for example, Li a A 1-b B b D2(0.90≤a≤1, 0≤b≤0.5), Li a E 1-b B b O 2-c D c (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05), LiE 2-b B b O 4-c D c (0≤b≤0.5, 0≤c≤0.05), Li a Ni 1-b-c Co b B c Dα (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α<2), Li a Nor 1-b-c Co b B c O 2-α F α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α<2), Li a Nor 1-b-c Mn b B c D α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α≤2), Li a Nor 1-b-c Mn b B c O 2-α F α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α<2), Li a Nor b E c G d O2(0.90≤a≤1, 0≤b≤0.9, 0≤c≤0.5, 0.001≤d≤0.1), Li a Nor b Co c Mn d GeO2(0.90≤a≤1, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0.001≤e≤0.1), Li a NiG b O2(0.9≤a≤1, 0.001≤b≤0.1), Li a CoG b O2(0.90≤a≤1, 0.001≤b≤0.1), Li a MnG b O2(0.90≤a≤1, 0.001≤b≤0.1), Li a Mn2GbO4(0.90≤a≤1, 0.001≤b≤0.1), QO2, QS2, LiQS2, V2O5, LiV2O5, LiIO2, LiNiVO4, Li 3-f J2(PO4)3(0≤f≤2), Li 3-fA compound represented by any one of Fe2(PO4)3(0≤f≤2), LiFePO4. In these compounds, the capital letter “A” is Ni, Co, Mn, or a combination thereof, the capital letter “B” is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof, the capital letter “D” is O, F, S, P, or a combination thereof, the capital letter “E” is Co, Mn, or a combination thereof, the capital letter “F” is F, S, P, or a combination thereof, the capital letter “G” is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof, the capital letter “Q” is Ti, Mo, Mn, or a combination thereof, the capital letter “I” is Cr, V, Fe, Sc, Y, or a combination thereof, and the capital letter “J” is V, Cr, Mn, Co, Ni, Cu, or a combination thereof.

[0103] The cathode active material may include, for example, a lithium salt of a transition metal oxide having a layered rock salt type structure among the lithium transition metal oxides described above. The "layered rock salt type structure" is, for example, a cubic rock salt type structure. <111> It is a structure in which oxygen atomic layers and metal atomic layers are alternately and regularly arranged in a direction, and thereby each atomic layer forms a two-dimensional plane. The "cubic rock salt structure" refers to the sodium chloride type (NaCl type) structure, which is a type of crystal structure, and specifically refers to a structure in which the face-centered cubic lattice (fcc) formed by each cation and anion is arranged with a displacement of half of the ridge of the unit lattice. Lithium transition metal oxides having this layered rock salt structure include, for example, LiNi x Co y Al z O2(NCA) or LiNi x Co y Mn zO2(NCM) (0 <x<1,0<y<1, 0<z<1, x+y+z=1) 등의 삼원계 리튬전이금속산화물일 수 있다. 양극 활물질이 층상암염형 구조를 갖는 삼원계 리튬전이금속산화물을 포함하는 경우, 전고체 단위셀(UCL)의 에너지 밀도가 커지고 열안정성이 향상될 수 있다.

[0104] The above-described compound included in the positive electrode active material may be covered by a coating layer (not shown). The positive electrode active material may also be a mixture of the above-described compound and a compound to which a coating layer is added. Meanwhile, the coating layer added to the surface of the positive electrode active material may include, for example, an oxide, a hydroxide, an oxyhydroxide, an oxycarbonate, or a hydroxycarbonate of the coating elements below. The compound forming the coating layer is amorphous or crystalline. The coating elements included in the coating layer may include Mg, Al, Co, K, Na, Ca, Si, Ti, V, Sn, Ge, Ga, B, As, Zr, or mixtures thereof. The coating layer may include, for example, Li2O-ZrO2 (LZO). The method for forming the coating layer is selected within a range that does not adversely affect the physical properties of the positive electrode active material (PAM). The method for forming the coating layer includes, for example, spray coating, dipping, etc.

[0105] When the positive electrode active material is a ternary lithium transition metal oxide such as NCA or NCM and contains nickel (Ni), it is possible to increase the capacity density of the all-solid-state unit cell (UCL) and reduce metal dissolution of the positive electrode active material (PAM) in a charged state. As a result, the cycle characteristics of the all-solid-state unit cell (UCL) in a charged state are improved. Meanwhile, the "cycle characteristics" are characteristics indicating the degree to which the all-solid-state unit cell (UCL) is deteriorated by charge / discharge of the all-solid-state unit cell (UCL). An all-solid-state unit cell (UCL) with high cycle characteristics may have a small degree of deterioration of the all-solid-state unit cell (UCL) due to charge / discharge, and an all-solid-state unit cell (UCL) with low cycle characteristics may have a large degree of deterioration of the all-solid-state unit cell (UCL) due to charge / discharge.

[0106] The positive electrode active material may have a particle shape such as a sphere or an ellipsoid, for example. The particle size and content of the positive electrode active material are not particularly limited.

[0107] The solid electrolyte may have a particle shape. The solid electrolyte may be dispersed between the positive electrode active materials. The solid electrolyte may include a sulfide-based solid electrolyte having excellent lithium ion conductivity characteristics. Examples of the sulfide-based solid electrolyte include Li2S-P2S5, Li2S-P2S5-LiX (X is a halogen element), Li2S-P2S5-Li2O, Li2S-P2S5-Li2O-LiI, Li2S-SiS2, Li2S-SiS2-LiI, Li2S-SiS2-LiBr, Li2S-SiS2-LiCl, Li2S-SiS2-B2S3-LiI, Li2S-SiS2-P2S5-LiI, Li2S-B2S3, Li2S-P2S5-Z m S n (m, n are positive numbers, capital letter “Z” represents Ge, Zn or Ga), Li2S-GeS2, Li2S-SiS2-Li3PO4, Li2S-SiS2-Li p MO q(p, q are positive numbers, capital letter “M” is one of P, Si, Ge, B, Al, Ga In), Li 7-x PS 6-x Cl x (0≤x≤2), Li 7-x PS 6-x Br x (0≤x≤2), and Li 7-x PS 6-x I x It may include at least one selected from (0≤x≤2).

[0108] Sulfide-based solid electrolytes include, for example, Li 7-x PS 6-x Cl x (0≤x≤2), Li 7-x PS 6-x Br x (0≤x≤2), and Li 7-x PS 6-x I x It may be an argyrodite-type compound including at least one selected from (0≤x≤2). In particular, the sulfide-based solid electrolyte may be an argyrodite-type compound including at least one selected from Li6PS5Cl, Li6PS5Br, and Li6PS5I.

[0109] Alternatively, the sulfide-based solid electrolyte is Li 7-a M a PS 6-c X cIt may be an argyrodite-type compound containing (0≤a≤2, (0≤c≤2)), where X may be F, Br, Cl, or a combination thereof. M is candium (Sc), yttrium (Y), titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), manganese (Mn), technetium (Tc), rhenium (Re), iron (Fe), ruthenium (Ru), osmium (Os), cobalt (Co), rhodium (Rh), iridium (Ir), nickel (Ni), palladium (Pd), platinum (Pt), copper (Cu), silver (Ag), gold (Au), zinc (Zn), cadmium (Cd), mercury (Hg), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), arsenic (As), antimony (Sb), bismuth (Bi), or a combination thereof. Can be.

[0110] The density of the argyrodite-type solid electrolyte may be 1.5 g / cc to 2.0 g / cc. Since the argyrodite-type solid electrolyte has a density of 1.5 g / cc or more, the internal resistance of the all-solid-state battery is reduced, and the defect of the solid electrolyte membrane being penetrated and short-circuited due to the formation of lithium dendrites can be prevented. The elastic modulus of the solid electrolyte may be, for example, 15 GPa to 35 GPa.

[0111] The solid electrolyte in the positive electrode active material layer (120) may have a smaller median particle size average particle diameter (D50) than the first and second solid electrolytes (SE1, SE2) in the solid electrolyte layer (300) to be described later. For example, the median particle size average particle diameter (D50) of the solid electrolyte included in the positive electrode active material layer (120) may be 90% or less, 80% or less, 70% or less, 60% or less, 50% or less, 40% or less, 30% or less, or 20% or less of the median particle size average particle diameter (D50) of the solid electrolyte included in the solid electrolyte layer (300). Meanwhile, the median particle size average particle diameter (D50) may be a median diameter measured using a laser particle size distribution meter.

[0112] The positive electrode active material layer (120) may include a conductive material. The conductive material may have conductivity without causing chemical changes in the all-solid-state unit cell (UCL), thereby increasing the conductivity of the positive electrode active material and the solid electrolyte. The conductive material may include a carbon-based material. For example, the conductive material may include one or more selected from graphite, carbon black, acetylene black, carbon nanofibers, and carbon nanotubes.

[0113] The positive electrode active material layer (120) may further include a binder. The binder may bind the positive electrode active material, the solid electrolyte, and the conductive material within the positive electrode active material layer (120) to each other. The binder may include a material for improving the bonding strength between the positive electrode active material layer (120) and the positive electrode current collector (110). The binder may include, for example, polyvinylidene fluoride, styrene butadiene rubber (SBR), polytetrafluoroethylene, polyvinylidene fluoride, vinylidene fluoride / hexafluoropropylene copolymer, polyacrylonitrile, and polymethyl methacrylate.

[0114] Based on 100 parts by weight of the total of the positive electrode active material, the solid electrolyte, the conductive agent, and the binder, the positive electrode active material layer (120) may include 7085 parts by weight or more and 92 parts by weight or less of the positive electrode active material. Based on 100 parts by weight of the total of the positive electrode active material (PAM), the solid electrolyte, the conductive agent, and the binder, the positive electrode active material layer (120) may include 0.5 parts by weight or more and 1.5 parts by weight or less of the binder.

[0115] Based on 100 parts by weight of the solid electrolyte, the positive electrode active material layer (120) may include 1 part by weight or more and 50 parts by weight or less of a conductive material. If the conductive material is included in the positive electrode active material layer (120) in an amount of less than 1 part by weight based on 100 parts by weight of the solid electrolyte, the proportion of the conductive material may decrease, thereby lowering the electrical conductivity of the positive electrode active material layer (120). If the conductive material is included in the positive electrode active material layer (120) in an amount of more than 50 parts by weight based on 100 parts by weight of the solid electrolyte, the proportion of the conductive material may be excessively high, so that a covering layer covering the surface of the solid electrolyte may not be properly formed.

[0116] The positive electrode active material layer (120) may further include additives such as fillers, coating agents, dispersants, and ion conductive aids in addition to the above-described positive electrode active material, solid electrolyte, conductive agent, and binder.

[0117] The negative electrode layer (200) may include a negative electrode current collector (210) and a negative electrode coating layer (220) on the negative electrode current collector (210). The negative electrode current collector (210) may provide a reference surface on which the negative electrode coating layer (220) is disposed. The negative electrode current collector (210) may include, for example, a material that does not react with lithium, i.e., does not form an alloy or a compound with lithium. For example, the negative electrode current collector (210) may include at least one metal selected from the group consisting of copper (Cu), stainless steel, titanium (Ti), iron (Fe), cobalt (Co), and nickel (Ni). The thickness of the negative electrode current collector (210) may be 1 μm to 20 μm, more specifically 5 μm to 15 μm, and more specifically 7 μm to 10 μm.

[0118] The negative electrode current collector (210) may be composed of one of the above-described metals, or may include an alloy or coating material of two or more metals. The negative electrode current collector (210) may have, for example, a plate shape or a foil shape. Meanwhile, in one embodiment, the negative electrode current collector (210) may be omitted.

[0119] The cathode coating layer (220) can allow lithium metal to grow between the cathode current collector (210) and the all-solid-state unit cell (UCL) when charging. The cathode coating layer (220) can act as a protective layer for the lithium metal and simultaneously suppress the precipitation and growth of lithium dendrites.

[0120] The cathode coating layer (220) may include a metal and carbon. For example, the cathode coating layer (220) may include at least one metal selected from the group consisting of gold (Au), platinum (Pt), palladium (Pd), silicon (Si), silver (Ag), aluminum (Al), bismuth (Bi), tin (Sn), and zinc (Zn). The cathode coating layer (220) may include at least one carbon selected from the group consisting of carbon black, acetylene black, furnace black, ketjen black, and graphene. In one embodiment, the cathode coating layer (220) may include a mixture of carbon black and silver (Ag).

[0121] The cathode coating layer (220) may further include additives other than metal and carbon. The cathode coating layer (220) may further include, for example, at least one additive selected from the group consisting of a binder, a filler, a coating agent, a dispersant, and an ion conductive additive.

[0122] The negative electrode coating layer (220) may have a smaller thickness than the positive electrode active material layer (120). The thickness of the negative electrode coating layer (220) may be, for example, 50% or less, 40% or less, 30% or less, 20% or less, 10% or less, or 5% or less of the thickness of the positive electrode active material layer (120). The thickness of the negative electrode coating layer (220) may be, for example, 1 um to 20 um, 2 um to 10 um, or 3 um to 7 um. If the thickness of the negative electrode coating layer (220) is too thin, lithium dendrites formed between the negative electrode coating layer (220) and the negative electrode current collector (210) may collapse the negative electrode coating layer (220), thereby deteriorating the cycle characteristics of the all-solid-state unit cell (UCL). If the thickness of the cathode coating layer (220) increases excessively, the energy density of the all-solid-state unit cell (UCL) may decrease and the internal resistance of the all-solid-state unit cell (UCL) due to the cathode coating layer (220) may increase, thereby deteriorating the cycle characteristics of the cell.

[0123] Meanwhile, although not shown, a carbon layer may be further included to improve adhesion between the cathode coating layer (220) and the solid electrolyte layer (300).

[0124] A solid electrolyte layer (300) may be provided between the positive electrode layer (100) and the negative electrode layer (200). The solid electrolyte layer (300) may include a sulfide-based solid electrolyte having excellent lithium ion conductivity characteristics. The solid electrolyte in the solid electrolyte layer (300) may be the same as or different from any one of the materials included in the solid electrolyte in the positive electrode active material layer (120) described above.

[0125] The solid electrolyte layer (300) may include an anode solid electrolyte layer (310) and a cathode solid electrolyte layer (320). The anode solid electrolyte layer (310) may be adjacent to the anode layer (100), and the cathode solid electrolyte layer (320) may be adjacent to the cathode layer (200).

[0126] The positive electrode solid electrolyte layer (310) may include a first solid electrolyte (SE1), and the negative electrode solid electrolyte layer (320) may include a second solid electrolyte (SE2). Each of the first and second solid electrolytes (SE1, SE2) may have a particle shape such as a sphere or an ellipsoid.

[0127] Each of the first and second solid electrolytes (SE1, SE2) may include a sulfide-based solid electrolyte. The first and second solid electrolytes (SE1, SE2) may be the same or different. Each of the first and second solid electrolytes (SE1, SE2) may be amorphous, crystalline, or a mixture thereof. In addition, the solid electrolyte may include, for example, at least sulfur (S), phosphorus (P), and lithium (Li) as constituent elements among the above-described sulfide-based solid electrolyte materials. For example, the solid electrolyte may be a material including Li2S-P2S5. When using a sulfide-based solid electrolyte material including Li2S-P2S5 to form the solid electrolyte, the mixing molar ratio of Li2S and P2S5 is, for example, in the range of Li2S:P2S5=50:50 to 90:10.

[0128] Sulfide-based solid electrolytes include, for example, Li 7-x PS 6-x Cl x (0≤x≤2), Li 7-x PS 6-x Br x (0≤x≤2), and Li 7-x PS 6-x I x It may be an argyrodite-type compound including at least one selected from (0≤x≤2). In particular, the sulfide-based solid electrolyte may be an argyrodite-type compound including at least one selected from Li6PS5Cl, Li6PS5Br, and Li6PS5I.

[0129] Alternatively, the sulfide-based solid electrolyte is Li 7-a Ma PS 6-c X c It may be an argyrodite-type compound containing (0≤a≤2, (0≤c≤2)), where X may be F, Br, Cl, or a combination thereof. M is candium (Sc), yttrium (Y), titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), manganese (Mn), technetium (Tc), rhenium (Re), iron (Fe), ruthenium (Ru), osmium (Os), cobalt (Co), rhodium (Rh), iridium (Ir), nickel (Ni), palladium (Pd), platinum (Pt), copper (Cu), silver (Ag), gold (Au), zinc (Zn), cadmium (Cd), mercury (Hg), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), arsenic (As), antimony (Sb), bismuth (Bi), or a combination thereof. Can be.

[0130] The density of the argyrodite-type solid electrolyte may be 1.5 g / cc to 2.0 g / cc. Since the argyrodite-type solid electrolyte has a density of 1.5 g / cc or more, the internal resistance of the all-solid-state battery is reduced, and the defect of the solid electrolyte membrane being penetrated and short-circuited due to the formation of lithium dendrites can be prevented. The elastic modulus of the first solid electrolyte (SE1) is, for example, 15 GPa to 35 GPa.

[0131] Each of the positive and negative electrode solid electrolyte layers (310, 320) may further include a binder. The binder included in the solid electrolyte layer (300) may be, for example, styrene butadiene rubber (SBR), polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, or the like, but is not limited thereto. The binder of the positive and negative electrode solid electrolyte layers (310, 320) may be the same as or different from the binder included in the positive electrode active material layer (120) or the binder included in the negative electrode coating layer (220).

[0132] Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications can be made within the scope of the patent claims, the detailed description of the invention, and the attached drawings, and it is obvious that this also falls within the scope of the present invention.

Claims

1. A device for peeling off the protective layer exposed on the upper part of the electrode. A tape supply unit configured to supply a peeling tape; A peeling unit configured to adhere the peeling tape to the upper surface of the protective layer and to drive the peeling tape adhered to the protective layer, the peeling unit including at least one of a peeling roller and a peeling knife; and A tape recovery unit configured to recover the above peeling tape is included, An electrode protective layer peeling device in which the peeling unit causes the peeling tape to travel in a state of being in close contact with the protective layer, thereby peeling the protective layer from the electrode.

2. In paragraph 1, The above peeling knife includes a flat surface facing the protective layer, An electrode protective layer peeling device, wherein the peeling tape running along the flat surface is in surface contact with the protective layer.

3. In paragraph 2, The above peeling knife further includes a sloped surface adjacent to the flat surface, An electrode protective layer peeling device in which the protective layer is adhered to the peeling tape and peeled along the inclined surface.

4. In paragraph 3, An electrode protective layer peeling device, wherein the peeling angle formed by the above-mentioned inclined surface and the above-mentioned flat surface is less than 90 degrees.

5. In paragraph 2, An electrode protective layer peeling device, wherein the peeling unit further includes a driving unit that drives the peeling knife or the peeling roller horizontally or vertically.

6. In paragraph 1, The above peeling tape includes a base layer and an adhesive layer on the base layer, An electrode protective layer peeling device in which the adhesive layer is adhered to the protective layer.

7. In paragraph 1, An electrode protective layer peeling device, wherein the traveling speed of the peeling tape is greater than the speed at which the peeling knife or the peeling roller passes through the upper surface of the protective layer.

8. In paragraph 1, An electrode protective layer peeling device further comprising a peeling table on which the electrode is mounted.

9. In paragraph 1, An electrode protective layer peeling device, wherein the peeling table includes a transport belt configured to drive the electrode.

10. In paragraph 1, The above electrodes are: An electrode protective layer stripping device comprising: a current collector; an active material layer on the current collector; a solid electrolyte layer on the active material layer; and the protective layer on the solid electrolyte layer.

11. In paragraph 10, An electrode protective layer stripping device, wherein the solid electrolyte layer comprises a sulfide-based solid electrolyte.

12. Unwinding the peeling tape wound on the tape supply roll and running it to the peeling unit; Using the above peeling unit, the peeling tape is driven to adhere to the upper surface of the protective layer of the electrode, Changing the running direction of the peeling tape so that the end of the peeling tape is bent upward using the peeling unit; and A method for peeling an electrode protective layer, comprising rewinding the above peeling tape onto a tape recovery roll.

13. In paragraph 12, A method for peeling off an electrode protective layer, wherein the peeling angle formed by the bent end and the remaining portion of the peeling tape is less than 90°.

14. In paragraph 13, The above peeling unit: At least one of a peeling roller and a peeling knife, The above peeling tape is driven while being adhered to the upper surface of the protective layer: Lowering the above peeling roller or the above peeling knife; and A method for peeling an electrode protective layer, comprising passing the electrode adjacent to the lower end of the peeling roller or the peeling knife.

15. In paragraph 14, The above peeling knife: A flat surface facing the above protective layer; and Including a slope adjacent to the above flat surface, A method for peeling off an electrode protective layer, wherein the above peeling tape is bent upward along the slope.

16. In paragraph 14, Passing the electrode adjacent to the lower end of the peeling roller and the peeling knife: A method for peeling off an electrode protective layer, which is performed by driving the above electrode.

17. In paragraph 14, Passing the electrode adjacent to the lower end of the peeling roller and the peeling knife: A method for peeling an electrode protective layer, which is performed by horizontally moving the peeling roller and the peeling knife.

18. In paragraph 12, A method for peeling off an electrode protective layer, wherein the peeling tape comprises a base layer and an adhesive layer on the base layer, and the adhesive layer is adhered to the protective layer.

19. In paragraph 12, The above electrodes are: A method for stripping an electrode protective layer, comprising: a current collector; an active material layer on the current collector; a solid electrolyte layer on the active material layer; and the protective layer on the solid electrolyte layer.

20. In paragraph 19, A method for stripping an electrode protective layer, wherein the solid electrolyte layer comprises a sulfide-based solid electrolyte.

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