Method for manufacturing battery pole piece and battery pole piece

Abstract

The present invention belongs to the technical field of battery manufacturing and discloses a method for manufacturing a battery pole piece and a battery pole piece. The solid raw materials of the pole piece layer are mixed and dry-mixed to obtain raw material powder. The raw material powder is then quantitatively added and spread into the concave mold of the pole piece mold for compaction. The compaction process is coordinated with heating and vibration. After the raw material powder is compacted, a pole piece layer is obtained. Then, a conductive glue is coated on the pole piece layer to adhere the pole piece layer to the surface of the current collector, and the pole piece layer and the current collector are pressed together. After the conductive glue is dried and solidified, a combined pole piece is obtained. Finally, the battery pole piece is cut to obtain the battery pole piece. The battery pole piece obtained by this production method has a high density of its pole piece layer, can form a good interface contact with the solid electrolyte, improve the conductivity of the finished solid-state battery, and is conducive to improving the stability and safety of the finished solid-state battery.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing, and in particular to a method for manufacturing a battery pole piece and a battery pole piece. Background Art

[0002] A battery is a device that converts chemical energy into electrical energy. It generally consists of two battery electrodes, one positive and one negative, and a battery electrolyte. The positive and negative electrodes are attached to either side of the battery electrolyte to form the basic unit of the battery. The battery electrode comprises a current collector and a electrode layer fixed to the current collector surface. Existing battery electrode production methods mostly use a slurry method. The core of the slurry method is to mix and disperse the electrode materials in a solvent to form a slurry, then apply the slurry to the current collector and bake and dry it to obtain the battery electrode.

[0003] For example, the Chinese invention patent with the authorization announcement number CN103022426B and the authorization announcement date of April 22, 2015, entitled "Method for preparing positive electrode sheets of lithium iron phosphate lithium-ion batteries for large-capacity automobiles", includes the following: (1) placing 86%-92% of lithium iron phosphate, 2%-4% of conductive agent, 3-4% of PVDF and the remaining solvent in a blender by weight, vacuuming and fully stirring to form a slurry; (2) coating the above slurry on the positive electrode collector at a surface density of 310-320 g / m, and forming a pole sheet after drying; (3) after the pole sheet is baked, rolling it to a pole sheet with a thickness of 170-180 μm according to the process requirements; (4) the rolled pole sheet is cut by an automatic slitting machine to obtain a pole sheet with a width of 295 mm; (5) the cut pole sheet is die-cut into the required pole sheet by an automatic die-cutting machine. This preparation method has certain limitations and defects. The fundamental reason is that the slurry is composed of electrode material and solvent. During the baking and drying process, the solvent evaporates and escapes, resulting in a large number of pores on the surface and inside of the resulting electrode layer. In other words, the electrode layer has a porous structure and a large porosity. This structure of the electrode layer is more advantageous for use in liquid batteries, as it can increase the contact area between the liquid electrolyte and the electrode layer. However, for solid-state batteries, the porous structure of the electrode layer will reduce the contact area between it and the solid electrolyte, resulting in a large interfacial impedance, which will ultimately lead to reduced stability and safety of the finished solid-state battery.

[0004] If the obtained battery electrode is compacted again through a compaction process, although the porosity can be reduced, the structure of the battery electrode is easily destroyed, which not only reduces the performance of the battery electrode, but also reduces the yield of the battery electrode. Therefore, the conventional slurry method is not suitable for the production of battery electrodes for solid-state batteries. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for manufacturing a battery electrode and a battery electrode. The obtained battery electrode has a high density and a small porosity, ensuring good interface contact between the battery electrode and the solid electrolyte, thereby improving the conductivity of the finished solid-state battery, and is conducive to improving the stability and safety of the finished solid-state battery.

[0006] The present invention provides a method for manufacturing a battery electrode, comprising the following steps:

[0007] S1. Mixing the solid raw materials of the electrode layer to obtain raw material powder;

[0008] S2. dry-mixing and stirring the raw material powder to obtain raw material powder;

[0009] S3, quantitatively adding the raw material powder and paving it into the concave mold of the electrode mold;

[0010] S4, controlling the movement of the convex mold of the electrode mold and closing the concave mold, heating the convex mold, the concave mold and the raw material powder, and compacting the raw material powder in the concave mold through the convex mold to obtain the electrode layer;

[0011] S5, keep the convex mold pressing the pole piece layer, wait for the convex mold, the concave mold and the pole piece layer to cool, open the concave mold and take out the pole piece layer;

[0012] S6. Applying a conductive adhesive on one side of the electrode layer, then adhering the electrode layer to the surface of the current collector through the conductive adhesive, pressing the electrode layer and the current collector together, and heating the electrode layer and the current collector at the same time. After the conductive adhesive is dried and solidified, a combined electrode is obtained;

[0013] S7. Cut and combine the electrodes to obtain battery electrodes.

[0014] Preferably, the solid raw materials in step S1 include a positive electrode main material, an electronic conductive agent, a fast ion conductor and a binder.

[0015] Preferably, the solid raw materials in step S1 include a negative electrode main material, an electronic conductive agent, a fast ion conductor and a binder.

[0016] Preferably, the thickness of the raw material powder added to the concave mold in step 3 is 1.3 to 1.5 times the thickness of the electrode layer in step 4.

[0017] Preferably, the heating temperature in step S4 is 170°C to 260°C.

[0018] Preferably, in step S4, the pressure applied by the punch on the raw material powder increases in a stepwise manner, and the maximum pressure value does not exceed 20 MPa.

[0019] If a higher pressure is directly used to compact the raw material powder, it is very likely that part of the raw material powder will be compacted first during the compaction process. The compacted part of the raw material powder will hinder the punch from compacting other raw material powders, making it impossible to effectively compact all the raw material powders. By adopting the above technical solution, the pressure increases in a step-by-step manner, and the dispersed raw material powder particles are first slowly gathered, and then slowly compacted to ensure that all raw material powders can be effectively compacted. The internal compaction degree of the obtained electrode layer is relatively uniform and the density is higher.

[0020] Preferably, the pressure applied by the punch on the raw material powder in step S4 is specifically divided into three steps: A1, the pressure applied by the punch on the raw material powder in the die is 1MPa~4MPa, which is maintained for 100s~140s; A2, the pressure applied by the punch on the raw material powder in the die is 4MPa~10MPa, which is maintained for 20s~40s; A3, the pressure applied by the punch on the raw material powder in the die is 6MPa~12MPa, which is maintained for 20s~40s.

[0021] Preferably, during the process of the punch compacting the raw material powder in step S4, the die vibrates along the moving direction of the punch.

[0022] By adopting the above technical solution, vibration is used during the compaction process to increase the contact probability between the raw material powder particles and make the raw material powder particles evenly distributed, thereby reducing the internal porosity of the obtained electrode layer and the number of pores on the surface of the obtained electrode layer, further improving the density of the electrode layer and enhancing the conductivity of the finished solid-state battery.

[0023] Preferably, the vibration frequency of the die in step S4 does not exceed 200 MHz.

[0024] The present invention also provides a battery pole piece obtained by using the above-mentioned method for manufacturing the battery pole piece.

[0025] Compared with the prior art, the advantages of the battery electrode manufacturing method and the battery electrode of the present invention are that the solid raw materials of the electrode layer are mixed and dry-mixed to obtain raw material powder, and then the raw material powder is quantitatively added and spread into the concave mold of the electrode mold for compaction. The compaction process is combined with heating, and the raw material powder is compacted to obtain the electrode layer. Compared with the conventional slurry method, no solvent is required, and the obtained electrode layer has a higher density and can form a good interface contact with the solid electrolyte, thereby improving the conductivity of the finished solid-state battery, and is beneficial to improving the stability and safety of the finished solid-state battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of the battery electrode in this embodiment.

[0027] In the figure: 1. Current collector; 2. Pole layer; 3. Conductive adhesive layer; DETAILED DESCRIPTION

[0028] The following combination Figure 1 The present invention is further described in detail with reference to the accompanying drawings and examples.

[0029] Example 1

[0030] like Figure 1 As shown, a battery electrode comprises a current collector 1, an electrode layer 2 and a conductive adhesive layer 3, wherein the electrode layer 2 and the current collector 1 are bonded and fixed by the conductive adhesive layer 3.

[0031] The current collector 1 can be divided into a positive electrode current collector and a negative electrode current collector according to its application in the battery. The positive electrode current collector is usually made of aluminum foil, and the negative electrode current collector is usually made of copper foil; the electrode layer 2 can be divided into a positive electrode plate and a negative electrode plate according to its application in the battery. The positive electrode plate is used in combination with the positive electrode collector, and the negative electrode plate is used in combination with the negative electrode collector; the conductive adhesive layer 3 is formed by curing the conductive adhesive and is used to bond and fix the electrode layer 2 and the current collector 1, wherein the conductive adhesive is prepared by a conductive agent and an adhesive slurry.

[0032] The above-mentioned method for manufacturing a battery electrode comprises the following steps:

[0033] S1. Mixing the solid raw materials of the electrode layer to obtain raw material powder;

[0034] S2. dry-mixing and stirring the raw material powder to obtain raw material powder;

[0035] S3, quantitatively adding the raw material powder and paving it into the concave mold of the electrode mold;

[0036] S4, controlling the movement of the convex mold of the electrode mold and closing the concave mold, heating the convex mold, the concave mold and the raw material powder, and compacting the raw material powder in the concave mold through the convex mold to obtain the electrode layer;

[0037] S5, keep the convex mold pressing the pole piece layer, wait for the convex mold, the concave mold and the pole piece layer to cool, open the concave mold and take out the pole piece layer;

[0038] S6. Applying a conductive adhesive on one side of the electrode layer, then adhering the electrode layer to the surface of the current collector through the conductive adhesive, pressing the electrode layer and the current collector together, and heating the electrode layer and the current collector at the same time. After the conductive adhesive is dried and solidified, a combined electrode is obtained;

[0039] S7. Cut the combined electrode pieces to obtain battery electrode pieces.

[0040] When the battery electrode produced above is a positive electrode, the solid raw materials in step S1 include a positive electrode main material, an electronic conductive agent, a fast ion conductor and a binder, wherein the positive electrode main material is one or more of lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium manganese oxide, lithium cobalt oxide and lithium iron phosphate.

[0041] When the battery electrode produced above is a negative electrode, the solid raw materials in step S1 include a negative electrode main material, an electronic conductive agent, a fast ion conductor and a binder, wherein the negative electrode main material is one or more of graphite, mesophase carbon microbeads, soft carbon, hard carbon, silicon carbon material, and lithium titanate.

[0042] Before executing step S2, the raw material powder needs to be baked to remove moisture in the raw material powder to ensure that the raw material powder is always in a dry powder state.

[0043] Example 2

[0044] The difference between this embodiment and embodiment 1 is that in step 3, the thickness of the raw material powder added to the die is 1.3 to 1.5 times the thickness of the electrode layer in step 4. In order to facilitate the rapid and accurate addition of a fixed amount of raw material powder into the die, the groove depth of the die is consistent with the thickness of the raw material powder to be added. When excess raw material powder is added, the raw material powder is scraped flat by a scraper so that the raw material powder just fills the groove.

[0045] In step S4, the heating temperature is controlled in the range of 170°C to 260°C; the pressure applied by the punch on the raw material powder increases in a step-by-step manner, and the maximum pressure value does not exceed 20 MPa; at the same time, in the process of the punch compacting the raw material powder, the die vibrates along the moving direction of the punch, and the vibration frequency of the die does not exceed 200 MHz.

[0046] Example 3

[0047] The difference between this embodiment and embodiment 2 is that the pressure exerted by the punch on the raw material powder in step S4 is specifically divided into three steps:

[0048] A1. The pressure exerted by the punch on the raw material powder in the die is 1MPa~4MPa and maintained for 100s~140s;

[0049] A2. The pressure exerted by the punch on the raw material powder in the die is 4MPa~10MPa and maintained for 20s~40s;

[0050] A3. The pressure exerted by the punch on the raw material powder in the die is 6MPa to 12MPa and maintained for 20s to 40s.

[0051] Example 4

[0052] A positive electrode sheet, wherein the main material of the positive electrode is lithium nickel cobalt manganese oxide, and the manufacturing method thereof comprises the following steps:

[0053] S1. Mix 77 g of lithium nickel cobalt manganese oxide, 1.5 g of an electronic conductive agent, 16 g of a fast ion conductor, and 5.5 g of a binder to obtain a raw material powder;

[0054] S2. Baking the raw material powder at 150° C. to remove moisture from the raw material powder;

[0055] S3, pouring the raw material powder after removing moisture into a mixing tank, and performing dry mixing and stirring to obtain a raw material powder;

[0056] S4. Add the raw material powder into a concave mold with a groove depth of 0.15 mm, use a scraper to flatten the raw material powder, and scrape off the excess raw material powder;

[0057] S5. Control the movement of the convex mold of the electrode mold and close the concave mold, heat the convex mold, the concave mold and the raw material powder, so that the temperature in the concave mold is controlled at 220±3°C, and at the same time, apply a stepped pressure to the raw material powder in the concave mold through the convex mold, and vibrate the concave mold along the moving direction of the convex mold (see Table 1) to obtain the electrode layer;

[0058] Table 1:

[0059] Positive electrode material lithium nickel cobalt manganese oxide Pressure of the first step / MPa 2 First step pressure holding time / s 120 Vibration frequency of the first step / kHz 0 Pressure of the second step / MPa 7 Second step pressure holding time / s 30 Vibration frequency of the second step / kHz 40 Pressure of the third step / MPa 11 Step 3: Pressure holding time / s 30 Vibration frequency of the third step / kHz 40

[0060] S6. Maintain the convex mold to press the pole piece layer. When the convex mold, the concave mold and the pole piece layer cool to a temperature below 60°C, open the concave mold and take out the pole piece layer.

[0061] S7. Take two obtained electrode layers, apply 6 μm thick wet conductive glue on the surface of the electrode layer, and then adhere the two electrode layers to the upper and lower surfaces of the current collector, and apply a pressure of 0.15 MPa on the two electrode layers, with the pressure facing the current collector. During the pressure application process, heat the current collector and the two electrode layers to 110° C. for 2 minutes. After the conductive glue is dried and solidified, a combined electrode is obtained;

[0062] S8: Cut the combined electrode to obtain a lithium nickel cobalt manganese oxide positive electrode.

[0063] Example 5

[0064] A positive electrode sheet, wherein the main material of the positive electrode is lithium iron phosphate, and the manufacturing method thereof comprises the following steps:

[0065] S1. Mix 65 g of lithium iron phosphate, 2 g of an electronic conductive agent, 25 g of a fast ion conductor, and 8 g of a binder to obtain a raw material powder;

[0066] S2. Baking the raw material powder at 150° C. to remove moisture from the raw material powder;

[0067] S3, pouring the raw material powder after removing moisture into a mixing tank, and performing dry mixing and stirring to obtain a raw material powder;

[0068] S4. Add the raw material powder into a concave mold with a groove depth of 0.15 mm, use a scraper to flatten the raw material powder, and scrape off the excess raw material powder;

[0069] S5. Control the movement of the convex mold of the electrode mold and close the concave mold, heat the convex mold, concave mold and raw material powder, so that the temperature in the concave mold is controlled at 220±3°C, and at the same time apply a stepped pressure to the raw material powder in the concave mold through the convex mold, and the concave mold vibrates along the moving direction of the convex mold (see Table 2) to obtain the electrode layer;

[0070] Table 2:

[0071]

[0072]

[0073] S6. Maintain the convex mold to press the pole piece layer. When the convex mold, the concave mold and the pole piece layer cool to a temperature below 60°C, open the concave mold and take out the pole piece layer.

[0074] S7. Take two obtained electrode layers, apply 6 μm thick wet conductive glue on the surface of the electrode layer, and then adhere the two electrode layers to the upper and lower surfaces of the current collector, and apply a pressure of 0.15 MPa on the two electrode layers, with the pressure facing the current collector. During the pressure application process, heat the current collector and the two electrode layers to 110° C. for 2 minutes. After the conductive glue is dried and solidified, a combined electrode is obtained;

[0075] S8: Cut the combined electrode to obtain a lithium iron phosphate positive electrode.

[0076] Example 6

[0077] A positive electrode sheet, wherein the main material of the positive electrode is lithium manganate, and the manufacturing method thereof comprises the following steps:

[0078] S1. Mix 72.5 g of lithium manganate, 1 g of an electronic conductive agent, 20 g of a fast ion conductor, and 6.5 g of a binder to obtain a raw material powder;

[0079] S2. Baking the raw material powder at 150° C. to remove moisture from the raw material powder;

[0080] S3, pouring the raw material powder after removing moisture into a mixing tank, and performing dry mixing and stirring to obtain a raw material powder;

[0081] S4. Add the raw material powder into a concave mold with a groove depth of 0.15 mm, use a scraper to flatten the raw material powder, and scrape off the excess raw material powder;

[0082] S5. Control the movement of the convex mold of the electrode mold and close the concave mold, heat the convex mold, the concave mold and the raw material powder, so that the temperature in the concave mold is controlled at 220±3°C, and at the same time, apply a stepped pressure to the raw material powder in the concave mold through the convex mold, and vibrate the concave mold along the movement direction of the convex mold (see Table 3) to obtain the electrode layer;

[0083] Table 3:

[0084]

[0085]

[0086] S6. Maintain the convex mold to press the pole piece layer. When the convex mold, the concave mold and the pole piece layer cool to a temperature below 60°C, open the concave mold and take out the pole piece layer.

[0087] S7. Take two obtained electrode layers, apply 6 μm thick wet conductive glue on the surface of the electrode layer, and then adhere the two electrode layers to the upper and lower surfaces of the current collector, and apply a pressure of 0.15 MPa on the two electrode layers, with the pressure facing the current collector. During the pressure application process, heat the current collector and the two electrode layers to 110° C. for 2 minutes. After the conductive glue is dried and solidified, a combined electrode is obtained;

[0088] S8: Cut the combined electrode to obtain a lithium manganese oxide positive electrode.

[0089] Example 7

[0090] A positive electrode sheet, wherein the main material of the positive electrode is lithium cobalt oxide, and the manufacturing method thereof comprises the following steps:

[0091] S1. Mix 84 g of lithium cobalt oxide, 1 g of an electronic conductive agent, 11 g of a fast ion conductor, and 4 g of a binder to obtain a raw material powder;

[0092] S2. Baking the raw material powder at 150° C. to remove moisture from the raw material powder;

[0093] S3, pouring the raw material powder after removing moisture into a mixing tank, and performing dry mixing and stirring to obtain a raw material powder;

[0094] S4. Add the raw material powder into a concave mold with a groove depth of 0.15 mm, use a scraper to flatten the raw material powder, and scrape off the excess raw material powder;

[0095] S5. Control the movement of the convex mold of the electrode sheet mold and close the concave mold, heat the convex mold, concave mold and raw material powder, so that the temperature in the concave mold is controlled at 220±3°C, and at the same time, apply a stepped pressure to the raw material powder in the concave mold through the convex mold, and vibrate the concave mold along the movement direction of the convex mold (see Table 4) to obtain the electrode layer;

[0096] Table 4:

[0097] Positive electrode material lithium cobalt oxide Pressure of the first step / MPa 1.5 First step pressure holding time / s 120 Vibration frequency of the first step / kHz 0 Pressure of the second step / MPa 8.5 Second step pressure holding time / s 30 Vibration frequency of the second step / kHz 40 Pressure of the third step / MPa 10.5 Step 3: Pressure holding time / s 30 Vibration frequency of the third step / kHz 40

[0098] S6. Maintain the convex mold to press the pole piece layer. When the convex mold, the concave mold and the pole piece layer cool to a temperature below 60°C, open the concave mold and take out the pole piece layer.

[0099] S7. Take two obtained electrode layers, apply 6 μm thick wet conductive glue on the surface of the electrode layer, and then adhere the two electrode layers to the upper and lower surfaces of the current collector, and apply a pressure of 0.15 MPa on the two electrode layers, with the pressure facing the current collector. During the pressure application process, heat the current collector and the two electrode layers to 110° C. for 2 minutes. After the conductive glue is dried and solidified, a combined electrode is obtained;

[0100] S8: Cut the combined electrode to obtain a lithium cobalt oxide positive electrode.

[0101] Example 8

[0102] A negative electrode sheet, wherein the main material of the negative electrode is graphite, and the manufacturing method thereof comprises the following steps:

[0103] S1. Mix 59.5 g of graphite, 0.5 g of an electronic conductive agent, 30 g of a fast ion conductor, and 10 g of a binder to obtain a raw material powder;

[0104] S2. Baking the raw material powder at 150° C. to remove moisture from the raw material powder;

[0105] S3, pouring the raw material powder after removing moisture into a mixing tank, and performing dry mixing and stirring to obtain a raw material powder;

[0106] S4. Add the raw material powder into a concave mold with a groove depth of 0.15 mm, use a scraper to flatten the raw material powder, and scrape off the excess raw material powder;

[0107] S5. Control the movement of the convex mold of the electrode mold and close the concave mold, heat the convex mold, the concave mold and the raw material powder, so that the temperature in the concave mold is controlled at 220±3°C, and at the same time, apply a stepped pressure to the raw material powder in the concave mold through the convex mold, and vibrate the concave mold along the movement direction of the convex mold (see Table 5) to obtain the electrode layer;

[0108] Table 5:

[0109] Negative electrode main material graphite Pressure of the first step / MPa 1.5 First step pressure holding time / s 120 Vibration frequency of the first step / kHz 0 Pressure of the second step / MPa 4.5 Second step pressure holding time / s 30 Vibration frequency of the second step / kHz 40 Pressure of the third step / MPa 6.5 Step 3: Pressure holding time / s 30 Vibration frequency of the third step / kHz 40

[0110] S6. Maintain the convex mold to press the pole piece layer. When the convex mold, the concave mold and the pole piece layer cool to a temperature below 60°C, open the concave mold and take out the pole piece layer.

[0111] S7. Take two obtained electrode layers, apply 6 μm thick wet conductive glue on the surface of the electrode layer, and then adhere the two electrode layers to the upper and lower surfaces of the current collector, and apply a pressure of 0.15 MPa on the two electrode layers, with the pressure facing the current collector. During the pressure application process, heat the current collector and the two electrode layers to 110° C. for 2 minutes. After the conductive glue is dried and solidified, a combined electrode is obtained;

[0112] S8: Cut the combined electrode sheet to obtain a graphite negative electrode sheet.

[0113] Example 9

[0114] A positive electrode sheet, wherein the main material of the positive electrode is lithium nickel cobalt manganese oxide, and the manufacturing method thereof comprises the following steps:

[0115] S1. Mix 77 g of lithium nickel cobalt manganese oxide, 1.5 g of an electronic conductive agent, 16 g of a fast ion conductor, and 5.5 g of a binder to obtain a raw material powder;

[0116] S2. Baking the raw material powder at 150° C. to remove moisture from the raw material powder;

[0117] S3, pouring the raw material powder after removing moisture into a mixing tank, and performing dry mixing and stirring to obtain a raw material powder;

[0118] S4. Add the raw material powder into a concave mold with a groove depth of 0.15 mm, use a scraper to flatten the raw material powder, and scrape off the excess raw material powder;

[0119] S5. Control the movement of the convex mold of the electrode sheet mold and close the concave mold. Heat the convex mold, concave mold and raw material powder to control the temperature in the concave mold at 220±3°C. At the same time, the convex mold applies a stepped pressure to the raw material powder in the concave mold, and the concave mold vibrates along the moving direction of the convex mold (see Table 6) to obtain the electrode layer.

[0120] Table 6:

[0121] Positive electrode material lithium nickel cobalt manganese oxide Pressure of the first step / MPa 1 First step pressure holding time / s 120 Vibration frequency of the first step / kHz 0 Pressure of the second step / MPa 6 Second step pressure holding time / s 30 Vibration frequency of the second step / kHz 40 Pressure of the third step / MPa 10 Step 3: Pressure holding time / s 30 Vibration frequency of the third step / kHz 40

[0122] S6. Maintain the convex mold to press the pole piece layer. When the convex mold, the concave mold and the pole piece layer cool to a temperature below 60°C, open the concave mold and take out the pole piece layer.

[0123] S7. Take two obtained electrode layers, apply 6 μm thick wet conductive glue on the surface of the electrode layer, and then adhere the two electrode layers to the upper and lower surfaces of the current collector, and apply a pressure of 0.15 MPa on the two electrode layers, with the pressure facing the current collector. During the pressure application process, heat the current collector and the two electrode layers to 110° C. for 2 minutes. After the conductive glue is dried and solidified, a combined electrode is obtained;

[0124] S8: Cut the combined electrode to obtain a lithium nickel cobalt manganese oxide positive electrode.

[0125] Example 10

[0126] A positive electrode sheet, wherein the main material of the positive electrode is lithium nickel cobalt manganese oxide, and the manufacturing method thereof comprises the following steps:

[0127] S1. Mix 77 g of lithium nickel cobalt manganese oxide, 1.5 g of an electronic conductive agent, 16 g of a fast ion conductor, and 5.5 g of a binder to obtain a raw material powder;

[0128] S2. Baking the raw material powder at 150° C. to remove moisture from the raw material powder;

[0129] S3, pouring the raw material powder after removing moisture into a mixing tank, and performing dry mixing and stirring to obtain a raw material powder;

[0130] S4. Add the raw material powder into a concave mold with a groove depth of 0.15 mm, use a scraper to flatten the raw material powder, and scrape off the excess raw material powder;

[0131] S5. Control the movement of the convex mold of the electrode mold and close the concave mold, heat the convex mold, concave mold and raw material powder, so that the temperature in the concave mold is controlled at 220±3°C, and at the same time apply a stepped pressure to the raw material powder in the concave mold through the convex mold, and the concave mold vibrates along the movement direction of the convex mold (see Table 7) to obtain the electrode layer;

[0132] Table 7:

[0133] Positive electrode material lithium nickel cobalt manganese oxide Pressure of the first step / MPa 3 First step pressure holding time / s 120 Vibration frequency of the first step / kHz 0 Pressure of the second step / MPa 8 Second step pressure holding time / s 30 Vibration frequency of the second step / kHz 40 Pressure of the third step / MPa 12 Step 3: Pressure holding time / s 30 Vibration frequency of the third step / kHz 40

[0134] S6. Maintain the convex mold to press the pole piece layer. When the convex mold, the concave mold and the pole piece layer cool to a temperature below 60°C, open the concave mold and take out the pole piece layer.

[0135] S7. Take two obtained electrode layers, apply 6 μm thick wet conductive glue on the surface of the electrode layer, and then adhere the two electrode layers to the upper and lower surfaces of the current collector, and apply a pressure of 0.15 MPa on the two electrode layers, with the pressure facing the current collector. During the pressure application process, heat the current collector and the two electrode layers to 110° C. for 2 minutes. After the conductive glue is dried and solidified, a combined electrode is obtained;

[0136] S8: Cut the combined electrode to obtain a lithium nickel cobalt manganese oxide positive electrode.

[0137] Example 11

[0138] A positive electrode sheet, wherein the main material of the positive electrode is lithium nickel cobalt manganese oxide, and the manufacturing method thereof comprises the following steps:

[0139] S1. Mix 77 g of lithium nickel cobalt manganese oxide, 1.5 g of an electronic conductive agent, 16 g of a fast ion conductor, and 5.5 g of a binder to obtain a raw material powder;

[0140] S2. Baking the raw material powder at 150° C. to remove moisture from the raw material powder;

[0141] S3, pouring the raw material powder after removing moisture into a mixing tank, and performing dry mixing and stirring to obtain a raw material powder;

[0142] S4. Add the raw material powder into a concave mold with a groove depth of 0.15 mm, use a scraper to flatten the raw material powder, and scrape off the excess raw material powder;

[0143] S5. Control the movement of the convex mold of the electrode sheet mold and close the concave mold. Heat the convex mold, concave mold and raw material powder to control the temperature in the concave mold at 220±3°C. At the same time, the convex mold applies a stepped pressure to the raw material powder in the concave mold, and the concave mold vibrates along the moving direction of the convex mold (see Table 8) to obtain the electrode layer.

[0144] Table 8:

[0145]

[0146]

[0147] S6. Maintain the convex mold to press the pole piece layer. When the convex mold, the concave mold and the pole piece layer cool to a temperature below 60°C, open the concave mold and take out the pole piece layer.

[0148] S7. Take two obtained electrode layers, apply 6 μm thick wet conductive glue on the surface of the electrode layer, and then adhere the two electrode layers to the upper and lower surfaces of the current collector, and apply a pressure of 0.15 MPa on the two electrode layers, with the pressure facing the current collector. During the pressure application process, heat the current collector and the two electrode layers to 110° C. for 2 minutes. After the conductive glue is dried and solidified, a combined electrode is obtained;

[0149] S8: Cut the combined electrode to obtain a lithium nickel cobalt manganese oxide positive electrode.

[0150] Example 12

[0151] A positive electrode sheet, wherein the main material of the positive electrode is lithium nickel cobalt manganese oxide, and the manufacturing method thereof comprises the following steps:

[0152] S1. Mix 77 g of lithium nickel cobalt manganese oxide, 1.5 g of an electronic conductive agent, 16 g of a fast ion conductor, and 5.5 g of a binder to obtain a raw material powder;

[0153] S2. Baking the raw material powder at 150° C. to remove moisture from the raw material powder;

[0154] S3, pouring the raw material powder after removing moisture into a mixing tank, and performing dry mixing and stirring to obtain a raw material powder;

[0155] S4. Add the raw material powder into a concave mold with a groove depth of 0.15 mm, use a scraper to flatten the raw material powder, and scrape off the excess raw material powder;

[0156] S5. Control the movement of the convex mold of the electrode mold and close the concave mold, heat the convex mold, concave mold and raw material powder, so that the temperature in the concave mold is controlled at 220±3°C, and at the same time, apply a stepped pressure to the raw material powder in the concave mold through the convex mold, and vibrate the concave mold along the movement direction of the convex mold (see Table 9) to obtain the electrode layer;

[0157] Table 9:

[0158]

[0159]

[0160] S6. Maintain the convex mold to press the pole piece layer. When the convex mold, the concave mold and the pole piece layer cool to a temperature below 60°C, open the concave mold and take out the pole piece layer.

[0161] S7. Take two obtained electrode layers, apply 6 μm thick wet conductive glue on the surface of the electrode layer, and then adhere the two electrode layers to the upper and lower surfaces of the current collector, and apply a pressure of 0.15 MPa on the two electrode layers, with the pressure facing the current collector. During the pressure application process, heat the current collector and the two electrode layers to 110° C. for 2 minutes. After the conductive glue is dried and solidified, a combined electrode is obtained;

[0162] S8: Cut the combined electrode to obtain a lithium nickel cobalt manganese oxide positive electrode.

[0163] Example 13

[0164] A positive electrode sheet, wherein the main material of the positive electrode is lithium nickel cobalt manganese oxide, and the manufacturing method thereof comprises the following steps:

[0165] S1. Mix 77 g of lithium nickel cobalt manganese oxide, 1.5 g of an electronic conductive agent, 16 g of a fast ion conductor, and 5.5 g of a binder to obtain a raw material powder;

[0166] S2. Baking the raw material powder at 150° C. to remove moisture from the raw material powder;

[0167] S3, pouring the raw material powder after removing moisture into a mixing tank, and performing dry mixing and stirring to obtain a raw material powder;

[0168] S4. Add the raw material powder into a concave mold with a groove depth of 0.15 mm, use a scraper to flatten the raw material powder, and scrape off the excess raw material powder;

[0169] S5. Control the movement of the convex mold of the electrode sheet mold and close the concave mold, heat the convex mold, concave mold and raw material powder, so that the temperature in the concave mold is controlled at 220±3°C, and at the same time, apply stepped pressure to the raw material powder in the concave mold through the convex mold, and vibrate the concave mold along the movement direction of the convex mold (see Table 10) to obtain the electrode sheet layer;

[0170] Table 10:

[0171] Positive electrode material lithium nickel cobalt manganese oxide Pressure of the first step / MPa 2 First step pressure holding time / s 120 Vibration frequency of the first step / kHz 0 Pressure of the second step / MPa 7 Second step pressure holding time / s 30 Vibration frequency of the second step / kHz 30 Pressure of the third step / MPa 11 Step 3: Pressure holding time / s 30 Vibration frequency of the third step / kHz 30

[0172] S6. Maintain the convex mold to press the pole piece layer. When the convex mold, the concave mold and the pole piece layer cool to a temperature below 60°C, open the concave mold and take out the pole piece layer.

[0173] S7. Take two obtained electrode layers, apply 6 μm thick wet conductive glue on the surface of the electrode layer, and then adhere the two electrode layers to the upper and lower surfaces of the current collector, and apply a pressure of 0.15 MPa on the two electrode layers, with the pressure facing the current collector. During the pressure application process, heat the current collector and the two electrode layers to 110° C. for 2 minutes. After the conductive glue is dried and solidified, a combined electrode is obtained;

[0174] S8: Cut the combined electrode to obtain a lithium nickel cobalt manganese oxide positive electrode.

[0175] Example 14

[0176] A positive electrode sheet, wherein the main material of the positive electrode is lithium nickel cobalt manganese oxide, and the manufacturing method thereof comprises the following steps:

[0177] S1. Mix 77 g of lithium nickel cobalt manganese oxide, 1.5 g of an electronic conductive agent, 16 g of a fast ion conductor, and 5.5 g of a binder to obtain a raw material powder;

[0178] S2. Baking the raw material powder at 150° C. to remove moisture from the raw material powder;

[0179] S3, pouring the raw material powder after removing moisture into a mixing tank, and performing dry mixing and stirring to obtain a raw material powder;

[0180] S4. Add the raw material powder into a concave mold with a groove depth of 0.15 mm, use a scraper to flatten the raw material powder, and scrape off the excess raw material powder;

[0181] S5. Control the movement of the convex mold of the electrode sheet mold and close the concave mold, heat the convex mold, concave mold and raw material powder, so that the temperature in the concave mold is controlled at 220±3°C, and at the same time, apply stepped pressure to the raw material powder in the concave mold through the convex mold, and vibrate the concave mold along the movement direction of the convex mold (see Table 11) to obtain the electrode layer;

[0182] Table 11:

[0183] Positive electrode material lithium nickel cobalt manganese oxide Pressure of the first step / MPa 2 First step pressure holding time / s 120 Vibration frequency of the first step / kHz 10 Pressure of the second step / MPa 7 Second step pressure holding time / s 30 Vibration frequency of the second step / kHz 50 Pressure of the third step / MPa 11 Step 3: Pressure holding time / s 30 Vibration frequency of the third step / kHz 50

[0184] S6. Maintain the convex mold to press the pole piece layer. When the convex mold, the concave mold and the pole piece layer cool to a temperature below 60°C, open the concave mold and take out the pole piece layer.

[0185] S7. Take two obtained electrode layers, apply 6 μm thick wet conductive glue on the surface of the electrode layer, and then adhere the two electrode layers to the upper and lower surfaces of the current collector, and apply a pressure of 0.15 MPa on the two electrode layers, with the pressure facing the current collector. During the pressure application process, heat the current collector and the two electrode layers to 110° C. for 2 minutes. After the conductive glue is dried and solidified, a combined electrode is obtained;

[0186] S8: Cut the combined electrode to obtain a lithium nickel cobalt manganese oxide positive electrode.

[0187] Comparative Example 1

[0188] A positive electrode sheet, wherein the main material of the positive electrode is lithium nickel cobalt manganese oxide, and the manufacturing method thereof is as follows:

[0189] S1. Take appropriate amounts of lithium nickel cobalt manganese oxide, an electronic conductive agent, and a binder, and mix them with a solvent to obtain a slurry;

[0190] S2. Use a coating machine to apply the slurry on one surface of the current collector and bake it in an oven for 3 minutes;

[0191] S3, flip the current collector, use a coating machine to apply the slurry on the other surface of the current collector, and bake it in an oven for 3 minutes to obtain a combined electrode;

[0192] S4, using a roller press to roll the obtained combined electrode sheet;

[0193] S5: Cut the combined electrode to obtain a lithium nickel cobalt manganese oxide positive electrode.

[0194] Comparative Example 2

[0195] A positive electrode sheet, wherein the main material of the positive electrode is lithium iron phosphate, and the manufacturing method thereof is as follows:

[0196] S1. Take appropriate amounts of lithium iron phosphate, an electronic conductive agent, and a binder, and mix them with a solvent to obtain a slurry;

[0197] S2. Use a coating machine to apply the slurry on one surface of the current collector and bake it in an oven for 3 minutes;

[0198] S3, flip the current collector, use a coating machine to apply the slurry on the other surface of the current collector, and bake it in an oven for 3 minutes to obtain a combined electrode;

[0199] S4, using a roller press to roll the obtained combined electrode sheet;

[0200] S5: Cut the combined electrode to obtain a lithium iron phosphate positive electrode.

[0201] Comparative Example 3

[0202] A positive electrode sheet, wherein the main material of the positive electrode is lithium manganate, and the manufacturing method thereof is as follows:

[0203] S1. Take appropriate amounts of lithium manganate, an electronic conductive agent, and a binder, and mix them with a solvent to obtain a slurry;

[0204] S2. Use a coating machine to apply the slurry on one surface of the current collector and bake it in an oven for 3 minutes;

[0205] S3, flip the current collector, use a coating machine to apply the slurry on the other surface of the current collector, and bake it in an oven for 3 minutes to obtain a combined electrode;

[0206] S4, using a roller press to roll the obtained combined electrode sheet;

[0207] S5: Cut the combined electrode to obtain a lithium manganese oxide positive electrode.

[0208] Comparative Example 4

[0209] A positive electrode sheet, wherein the main material of the positive electrode is lithium cobalt oxide, and the manufacturing method thereof is as follows:

[0210] S1. Take appropriate amounts of lithium cobalt oxide, an electronic conductive agent, and a binder, and mix them with a solvent to obtain a slurry;

[0211] S2. Use a coating machine to apply the slurry on one surface of the current collector and bake it in an oven for 3 minutes;

[0212] S3, flip the current collector, use a coating machine to apply the slurry on the other surface of the current collector, and bake it in an oven for 3 minutes to obtain a combined electrode;

[0213] S4, using a roller press to roll the obtained combined electrode sheet;

[0214] S5: Cut the combined electrode to obtain a lithium cobalt oxide positive electrode.

[0215] Comparative Example 5

[0216] A negative electrode sheet, wherein the main material of the negative electrode is graphite, and the manufacturing method thereof is as follows:

[0217] S1. Take appropriate amounts of graphite, an electronic conductive agent, and a binder, and mix them with a solvent to obtain a slurry;

[0218] S2. Use a coating machine to apply the slurry on one surface of the current collector and bake it in an oven for 3 minutes;

[0219] S3, flip the current collector, use a coating machine to apply the slurry on the other surface of the current collector, and bake it in an oven for 3 minutes to obtain a combined electrode;

[0220] S4, using a roller press to roll the obtained combined electrode sheet;

[0221] S5: Cut the combined electrode sheet to obtain a graphite negative electrode sheet.

[0222] Comparative Example 6

[0223] A positive electrode sheet, wherein the main material of the positive electrode is lithium nickel cobalt manganese oxide, and the manufacturing method thereof comprises the following steps:

[0224] S1. Mix 77 g of lithium nickel cobalt manganese oxide, 1.5 g of an electronic conductive agent, 16 g of a fast ion conductor, and 5.5 g of a binder to obtain a raw material powder;

[0225] S2. Baking the raw material powder at 150° C. to remove moisture from the raw material powder;

[0226] S3, pouring the raw material powder after removing moisture into a mixing tank, and performing dry mixing and stirring to obtain a raw material powder;

[0227] S4. Add the raw material powder into a concave mold with a groove depth of 0.15 mm, use a scraper to flatten the raw material powder, and scrape off the excess raw material powder;

[0228] S5. Control the movement of the convex mold of the electrode sheet mold and close the concave mold, heat the convex mold, the concave mold and the raw material powder, and control the temperature in the concave mold to 220±3°C. At the same time, apply a stepped pressure (see Table 12) to the raw material powder in the concave mold through the convex mold to obtain the electrode layer;

[0229] Table 12:

[0230] Positive electrode material lithium nickel cobalt manganese oxide Pressure of the first step / MPa 2 First step pressure holding time / s 120 Vibration frequency of the first step / kHz 0 Pressure of the second step / MPa 7 Second step pressure holding time / s 30 Vibration frequency of the second step / kHz 0 Pressure of the third step / MPa 11 Step 3: Pressure holding time / s 30 Vibration frequency of the third step / kHz 0

[0231] S6. Maintain the convex mold to press the pole piece layer. When the convex mold, the concave mold and the pole piece layer cool to a temperature below 60°C, open the concave mold and take out the pole piece layer.

[0232] S7. Take two obtained electrode layers, apply 6 μm thick wet conductive glue on the surface of the electrode layer, and then adhere the two electrode layers to the upper and lower surfaces of the current collector, and apply a pressure of 0.15 MPa on the two electrode layers, with the pressure facing the current collector. During the pressure application process, heat the current collector and the two electrode layers to 110° C. for 2 minutes. After the conductive glue is dried and solidified, a combined electrode is obtained;

[0233] S8: Cut the combined electrode to obtain a lithium nickel cobalt manganese oxide positive electrode.

[0234] Comparative Example 7

[0235] A negative electrode sheet, wherein the main material of the negative electrode is graphite, and the manufacturing method thereof comprises the following steps:

[0236] S1. Mix 59.5 g of graphite, 0.5 g of an electronic conductive agent, 30 g of a fast ion conductor, and 10 g of a binder to obtain a raw material powder;

[0237] S2. Baking the raw material powder at 150° C. to remove moisture from the raw material powder;

[0238] S3, pouring the raw material powder after removing moisture into a mixing tank, and performing dry mixing and stirring to obtain a raw material powder;

[0239] S4. Add the raw material powder into a concave mold with a groove depth of 0.15 mm, use a scraper to flatten the raw material powder, and scrape off the excess raw material powder;

[0240] S5. Control the movement of the convex mold of the electrode mold and close the concave mold, heat the convex mold, the concave mold and the raw material powder, so that the temperature in the concave mold is controlled at 220±3°C, and at the same time apply a stepped pressure (see Table 13) to the raw material powder in the concave mold through the convex mold to obtain the electrode layer;

[0241] Table 13:

[0242] Negative electrode main material graphite Pressure of the first step / MPa 1.5 First step pressure holding time / s 120 Vibration frequency of the first step / kHz 0 Pressure of the second step / MPa 4.5 Second step pressure holding time / s 30 Vibration frequency of the second step / kHz 0 Pressure of the third step / MPa 6.5 Step 3: Pressure holding time / s 30 Vibration frequency of the third step / kHz 0

[0243] S6. Maintain the convex mold to press the pole piece layer. When the convex mold, the concave mold and the pole piece layer cool to a temperature below 60°C, open the concave mold and take out the pole piece layer.

[0244] S7. Take two obtained electrode layers, apply 6 μm thick wet conductive glue on the surface of the electrode layer, and then adhere the two electrode layers to the upper and lower surfaces of the current collector, and apply a pressure of 0.15 MPa on the two electrode layers, with the pressure facing the current collector. During the pressure application process, heat the current collector and the two electrode layers to 110° C. for 2 minutes. After the conductive glue is dried and solidified, a combined electrode is obtained;

[0245] S8: Cut the combined electrode sheet to obtain a graphite negative electrode sheet.

[0246] The test results of Examples 4 to 14 and Comparative Examples 1 to 7 are shown in Table 14.

[0247] Table 14

[0248] Average porosity (using hexadecane mass immersion mass difference method) Example 4 3.14％ Example 5 9.61％ Example 6 4.05％ Example 7 2.76％ Example 8 6.30％ Example 9 3.43％ Example 10 3.11％ Example 11 3.17％ Example 12 3.14％ Example 13 4.70％ Example 14 3.14％ Comparative Example 1 22.56％ Comparative Example 2 25.81％ Comparative Example 3 23.95％ Comparative Example 4 22.03％ Comparative Example 5 21.62％ Comparative Example 6 12.89％ Comparative Example 7 14.57％

[0249] By comparing the average porosity of Examples 4 to 8 and the average porosity of Comparative Examples 1 to 5, it can be seen that the porosity of the electrode layer on the battery electrode obtained by the battery electrode manufacturing method of the present application is much smaller than the porosity of the electrode layer on the battery electrode obtained by the slurry method. When the battery electrode obtained by the battery electrode manufacturing method of the present application is assembled onto a solid-state battery, good interface contact can be formed between the battery electrode and the solid-state electrolyte, and the interface impedance is small, which is beneficial to improving the conductivity of the finished solid-state battery, as well as improving the stability and safety of the finished solid-state battery.

[0250] By comparing the average porosity of Example 4 with the average porosity of Comparative Example 6, and comparing the average porosity of Example 8 with the average porosity of Comparative Example 7, it can be seen that vibration is used during the compaction of the raw material powder, which can effectively increase the contact probability between the raw material powder particles and make the raw material powder particles evenly distributed, thereby reducing the internal porosity of the obtained electrode layer and the number of pores on the surface of the obtained electrode layer, further improving the density of the electrode layer, and making the obtained electrode layer meet the expected high-quality effects.

[0251] By comparing the average porosity of Example 4, the average porosity of Example 9 and the average porosity of Example 10, it can be seen that increasing the pressure can effectively increase the contact probability between the raw material powder particles and reduce the average porosity of the obtained electrode layer. After actual testing, if the pressure is further increased, the average porosity of the electrode layer changes little, basically maintaining between 3.06% and 3.14%.

[0252] By comparing the average porosity of Example 4, the average porosity of Example 11 and the average porosity of Example 12, it can be seen that extending the pressure holding time is helpful in reducing the average porosity of the obtained electrode layer, but when the pressure holding time reaches a certain value, continuing to extend the pressure holding time has no obvious help to the average porosity of the obtained electrode layer.

[0253] By comparing the average porosity of Example 4, the average porosity of Example 13, the average porosity of Example 14 and the average porosity of Comparative Example 6, it can be seen that the use of vibration during the compaction of the raw material powder can effectively increase the contact probability between the raw material powder particles and make the raw material powder particles evenly distributed. However, after the vibration frequency reaches a certain value, continuing to increase the vibration frequency has no obvious help to the average porosity of the obtained electrode layer.

[0254] Compared with the prior art, the advantages of the battery electrode of the present invention are that the solid raw materials of the electrode layer are mixed and dry-mixed in a fully dry powder state to obtain raw material powder, and then the raw material powder is quantitatively added and paved into the concave mold of the electrode mold for compaction. The compaction process is combined with heating, and the raw material powder is compacted to obtain the electrode layer. Compared with the conventional slurry method, no solvent is required to be added, and the obtained electrode layer has a higher density and can form a good interface contact with the solid electrolyte, thereby improving the conductivity of the finished solid-state battery, and is conducive to improving the stability and safety of the finished solid-state battery.

[0255] Although the preferred embodiments of the present invention have been described in detail above, it should be clearly understood that various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for manufacturing a battery electrode, characterized in that: The following steps are involved: S1. Mixing the solid raw materials of the electrode layer to obtain a raw material powder, wherein the solid raw materials include a positive electrode main material or a negative electrode main material, an electronic conductive agent, a fast ion conductor and a binder; S2. dry-mixing and stirring the raw material powder to obtain raw material powder; S3, quantitatively adding the raw material powder and paving it into the concave mold of the electrode mold; S4, controlling the movement of the punch of the electrode mold and closing the die, heating the punch, die and raw material powder to 170°C to 260°C, and applying step-by-step pressure to the raw material powder in the die through the punch to compact it, wherein the step-by-step pressure application includes: A1. The pressure exerted by the punch on the raw material powder in the die is 1MPa~4MPa and maintained for 100s~140s; A2. The pressure exerted by the punch on the raw material powder in the die is 4MPa~10MPa and maintained for 20s~40s; A3. The pressure exerted by the punch on the raw material powder in the die is 6MPa to 12MPa and maintained for 20s to 40s; During the process of the punch compacting the raw material powder, the die vibrates along the moving direction of the punch, with the vibration frequency not exceeding 200MHz, to obtain the pole piece layer; During the compaction process, vibration is added to increase the contact probability between the raw material powder particles and to evenly distribute the raw material powder particles, thereby reducing the porosity inside the obtained electrode layer and reducing the number of pores on the surface of the obtained electrode layer; S5, keep the convex mold pressing the pole piece layer, wait for the convex mold, the concave mold and the pole piece layer to cool, open the concave mold and take out the pole piece layer; S6. Applying a conductive adhesive on one side of the electrode layer, then adhering the electrode layer to the surface of the current collector through the conductive adhesive, pressing the electrode layer and the current collector together, and heating the electrode layer and the current collector at the same time. After the conductive adhesive is dried and solidified, a combined electrode is obtained; S7. Cut and combine the electrodes to obtain battery electrodes.

2. The method for manufacturing a battery electrode according to claim 1, wherein: The thickness of the raw material powder added to the concave mold in step S3 is 1.3 to 1.5 times the thickness of the electrode layer in step S4.

3. A battery electrode, characterized in that: A battery pole piece obtained by the method for manufacturing a battery pole piece according to claim 1 or 2.

Images