CN113517420A - Manufacturing method of battery pole piece and battery pole piece - Google Patents
Manufacturing method of battery pole piece and battery pole piece Download PDFInfo
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- CN113517420A CN113517420A CN202110643786.9A CN202110643786A CN113517420A CN 113517420 A CN113517420 A CN 113517420A CN 202110643786 A CN202110643786 A CN 202110643786A CN 113517420 A CN113517420 A CN 113517420A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention belongs to the technical field of battery manufacturing, and discloses a manufacturing method of a battery pole piece and the battery pole piece, wherein solid raw materials of the pole piece layer are mixed and dry-mixed and stirred to obtain raw material powder, then quantitatively adding the raw material powder, paving the raw material powder into a female die of a pole piece die, compacting, heating and vibrating in a compacting process, compacting the raw material powder to obtain a pole piece layer, then coating conductive adhesive on the pole piece layer to adhere the pole piece layer to the surface of the current collector, pressing the pole piece layer and the current collector, drying and curing the conductive adhesive, obtaining a combined pole piece, finally cutting to obtain a battery pole piece, obtaining the battery pole piece by the manufacturing method, the electrode layer has higher density, can form good interface contact with solid electrolyte, improves the conductivity of the finished solid battery, and is favorable for improving the stability and the safety of the finished solid battery.
Description
Technical Field
The invention relates to the technical field of battery manufacturing, in particular to a manufacturing method of a battery pole piece and the battery pole piece.
Background
The battery refers to a device capable of converting chemical energy into electric energy, and generally comprises two battery pole pieces and a battery electrolyte, wherein the two battery pole pieces are respectively a positive pole piece and a negative pole piece, and the positive pole piece and the negative pole piece are respectively attached to two sides of the battery electrolyte to form a basic unit of the battery. The battery pole piece comprises a current collector and a pole piece layer fixed on the surface of the current collector, the production mode of the existing battery pole piece mostly adopts a slurry method, the core of the slurry method is to mix and disperse pole piece materials in a solvent to form slurry, then coat the slurry on the current collector, and bake and dry to obtain the battery pole piece.
For example, a chinese patent invention entitled "method for manufacturing positive electrode plate of lithium iron phosphate lithium ion battery for large capacity automobile" with an authorization publication number of CN103022426B and an authorization publication date of 2015, 04 and 22 months, includes: (1) putting 86-92% of lithium iron phosphate, 2-4% of conductive agent, 3-4% of PVDF and the balance of solvent in a stirrer according to weight percentage, vacuumizing and fully stirring to prepare slurry; (2) coating the slurry on a positive current collector according to the surface density of 310-320 g/m, and drying to prepare a pole piece; (3) after the pole piece is baked, rolling the pole piece to a thickness of 170-180 mu m according to the process requirement; (4) cutting the rolled pole piece by using an automatic slitting machine to obtain a pole piece with the width of 295 mm; (5) and die-cutting the cut pole piece to obtain the required pole piece by using an automatic die-cutting machine. The preparation method has certain limitations and defects, and is mainly characterized in that the slurry is composed of a pole piece material and a solvent, the solvent is volatilized and removed in the baking and drying process, and a large number of air holes are formed on the surface and inside of the finally obtained pole piece layer, namely, the pole piece layer is of a porous structure and has high porosity. The pole piece layer with the structure is used in a liquid battery, the contact area between a liquid electrolyte and the pole piece layer can be increased, but for a solid battery, the contact area between the pole piece layer and the solid electrolyte is reduced due to the pole piece layer with the porous structure, the interfacial resistance is high, and finally, the stability and the safety of the finished solid battery are reduced.
If the obtained battery pole piece is compacted by a compaction process, the porosity can be reduced, but the structure of the battery pole piece is easy to damage, the performance of the battery pole piece is reduced, and the yield of the battery pole piece is also reduced, so that the conventional slurry method is not suitable for manufacturing the battery pole piece of the solid-state battery.
Disclosure of Invention
The invention aims to provide a manufacturing method of a battery pole piece and the battery pole piece, the obtained battery pole piece has higher density and smaller porosity, and good interface contact between the battery pole piece and a solid electrolyte is ensured, so that the conductivity of a finished solid battery is improved, and the stability and the safety of the finished solid battery are favorably improved.
The invention provides a manufacturing method of a battery pole piece, which comprises the following steps:
s1, mixing the solid raw materials of the pole piece layer to obtain raw material powder;
s2, dry-mixing and stirring the raw material powder to obtain raw material powder;
s3, quantitatively adding and paving the raw material powder into a female die of a pole piece die;
s4, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder, and compacting the raw material powder in the female die through the male die to obtain a pole piece layer;
s5, maintaining the male die to press the pole piece layer, opening the female die after the male die, the female die and the pole piece layer are cooled, and taking out the pole piece layer;
s6, coating a conductive adhesive on one surface of the pole piece layer, adhering the pole piece layer to the surface of the current collector through the conductive adhesive, pressing the pole piece layer and the current collector, heating the pole piece layer and the current collector simultaneously, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
and S7, cutting the combined pole piece to obtain the battery pole piece.
Preferably, the solid raw materials in step S1 include a positive electrode main material, an electron conductive agent, a fast ion conductor, and a binder.
Preferably, the solid raw material in step S1 includes a negative electrode main material, an electron conductive agent, a fast ion conductor, and a binder.
Preferably, the thickness of the raw material powder added into the die in the step 3 is 1.3 to 1.5 times of the thickness of the pole piece layer in the step 4.
Preferably, the heating temperature in step S4 is 170 to 260 ℃.
Preferably, in step S4, the pressure of the embossing die on the raw powder is increased in a stepwise manner, and the maximum pressure value of the pressing is not more than 20 MPa.
If directly adopt great pressure direct compaction raw materials powder, in-process at the compaction raw materials powder is probably with partial raw materials powder compaction earlier, this compacted partial raw materials powder can obstruct other raw materials powder of terrace die compaction, thereby can't effectually with the compaction of all raw materials powder, through adopting above-mentioned technical scheme, pressure is cascaded increase, gather together slowly earlier the granule of the raw materials powder of dispersion, then slowly the compaction again, guarantee that all raw materials powder can both obtain effectual compaction, the inside compaction degree of the polar plate layer that obtains is comparatively even, the density is higher.
Preferably, the pressure exerted on the raw material powder by the convex die in the step S4 is specifically divided into three steps: a1, the pressure of the male die on the raw material powder in the female die is 1MPa to 4MPa, and the pressure is maintained for 100s to 140 s; a2, the pressure of the male die on the raw material powder in the female die is 4MPa to 10MPa, and the pressure is maintained for 20s to 40 s; a3, the pressure of the male die on the raw material powder in the female die is 6MPa to 12MPa, and the pressure is maintained for 20s to 40 s.
Preferably, in the process of embossing the compacted raw material powder in the step S4, the female mold is vibrated in the moving direction of the male mold.
Through adopting above-mentioned technical scheme, be aided with the vibration at the in-process of compaction to increase the contact probability between raw materials powder granule, and make the granule evenly distributed of raw materials powder, thereby reduce the porosity of the inside of the polar plate layer that obtains, and reduce the gas pocket quantity on the surface of the polar plate layer that obtains, further improved the density of polar plate layer, promoted the conductivity of finished product solid-state battery.
Preferably, the vibration frequency of the die in the step S4 is not more than 200 MHz.
The invention also provides a battery pole piece, and the battery pole piece is obtained by adopting the manufacturing method of the battery pole piece.
Compared with the prior art, the manufacturing method of the battery pole piece and the battery pole piece have the advantages that solid raw materials of the pole piece layer are mixed and subjected to dry mixing stirring to obtain raw material powder, then the raw material powder is quantitatively added and paved in a female die of a pole piece die to be compacted, heating is matched in the compacting process, the pole piece layer is obtained after the raw material powder is compacted, compared with a conventional slurry method, no solvent is required to be added, the obtained pole piece layer is high in compactness and can form good interface contact with solid electrolyte, so that the conductivity of a finished solid battery is improved, and the stability and the safety of the finished solid battery are improved.
Drawings
Fig. 1 is a schematic structural diagram of a battery pole piece in the embodiment.
In the figure: 1. a current collector; 2. a pole piece layer; 3. a conductive adhesive layer;
Detailed Description
The invention is described in further detail below with reference to fig. 1 and the examples.
Examples 1,
As shown in fig. 1, a battery pole piece comprises a current collector 1, a pole piece layer 2 and a conductive adhesive layer 3, wherein the pole piece layer 2 and the current collector 1 are fixedly bonded through the conductive adhesive layer 3.
The current collector 1 can be divided into a positive current collector and a negative current collector according to the application of the current collector in a battery, wherein the positive current collector generally adopts an aluminum foil, and the negative current collector generally adopts a copper foil; the pole piece layer 2 can be divided into a positive pole piece and a negative pole piece according to the application of the pole piece layer in the battery, wherein the positive pole piece is matched with a positive current collector for use, and the negative pole piece is matched with a negative current collector for use; the conductive adhesive layer 3 is formed by curing conductive adhesive and is used for bonding and fixing the pole piece layer 2 and the current collector 1, wherein the conductive adhesive is prepared by conductive agent and adhesive slurry.
The manufacturing method of the battery pole piece comprises the following steps:
s1, mixing the solid raw materials of the pole piece layer to obtain raw material powder;
s2, dry-mixing and stirring the raw material powder to obtain raw material powder;
s3, quantitatively adding and paving the raw material powder into a female die of a pole piece die;
s4, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder, and compacting the raw material powder in the female die through the male die to obtain a pole piece layer;
s5, maintaining the male die to press the pole piece layer, opening the female die after the male die, the female die and the pole piece layer are cooled, and taking out the pole piece layer;
s6, coating a conductive adhesive on one surface of the pole piece layer, adhering the pole piece layer to the surface of the current collector through the conductive adhesive, pressing the pole piece layer and the current collector, heating the pole piece layer and the current collector simultaneously, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
and S7, cutting the combined pole piece to obtain the battery pole piece.
When the manufactured battery pole piece is a positive pole piece, the solid raw material in the step S1 includes a positive pole main material, an electronic conductive agent, a fast ion conductor and a binder, wherein the positive pole main material is one or more of nickel cobalt lithium manganate, nickel cobalt lithium aluminate, lithium manganate, lithium cobaltate and lithium iron phosphate.
When the manufactured battery pole piece is a negative pole piece, the solid raw materials in the step S1 include a negative pole main material, an electronic conductive agent, a fast ion conductor and a binder, wherein the negative pole main material is one or more of graphite, mesocarbon microbeads, soft carbon, hard carbon, a silicon carbon material and lithium titanate.
Before step S2 is executed, the raw powder needs to be baked to remove moisture in the raw powder, so as to ensure that the raw powder is always in a dry powder state.
Examples 2,
The difference between this embodiment and embodiment 1 is that in step 3, the thickness of the raw material powder added into the cavity is 1.3-1.5 times of the thickness of the pole piece layer in step 4, in order to facilitate the rapid and accurate addition of a certain amount of raw material powder into the cavity, the depth of the cavity is consistent with the thickness of the raw material powder to be added, and when excessive raw material powder is added, the raw material powder is scraped off by a scraper, so that the raw material powder just fills the grooves.
In step S4, the heating temperature is controlled within the range of 170-260 ℃; the pressure exerted by the male die on the raw material powder is increased in a stepped manner, and the maximum pressure value of the exerted pressure is not more than 20 MPa; meanwhile, in the process of compacting the raw material powder by the male die, the female die vibrates along the moving direction of the male die, and the vibration frequency of the female die does not exceed 200 MHz.
Examples 3,
The difference between this example and example 2 is that the pressure exerted on the raw powder by the embossing die in step S4 is specifically divided into three steps:
a1, the pressure of the male die on the raw material powder in the female die is 1MPa to 4MPa, and the pressure is maintained for 100s to 140 s;
a2, the pressure of the male die on the raw material powder in the female die is 4MPa to 10MPa, and the pressure is maintained for 20s to 40 s;
a3, the pressure of the male die on the raw material powder in the female die is 6MPa to 12MPa, and the pressure is maintained for 20s to 40 s.
Examples 4,
A positive pole piece, the main material of the positive pole is nickel cobalt lithium manganate, and the manufacturing method comprises the following steps:
s1, mixing 77g of nickel cobalt lithium manganate, 1.5g of electronic conductive agent, 16g of fast ion conductor and 5.5g of binder to obtain raw material powder;
s2, baking the raw material powder at 150 ℃ to remove moisture in the raw material powder;
s3, pouring the raw material powder subjected to moisture removal into a stirring cylinder, and carrying out dry mixing and stirring to obtain raw material powder;
s4, adding the raw material powder into a female die with the groove depth of 0.15mm, scraping the raw material powder by using a scraper and scraping redundant raw material powder;
s5, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder to control the temperature in the female die to be 220 +/-3 ℃, applying stepped pressure to the raw material powder in the female die through the male die, and vibrating the female die along the moving direction of the male die (see table 1) to obtain a pole piece layer;
table 1:
| positive electrode main material | Lithium nickel cobalt manganese oxide |
| Pressure of the first step/ |
2 |
| First step pressure holding time/s | 120 |
| Vibration frequency/kHz of the first step | 0 |
| pressure/MPa of the second step | 7 |
| Second step pressure holding time/s | 30 |
| Vibration frequency/kHz of the second step | 40 |
| pressure/MPa of the third step | 11 |
| Third step pressure holding time/s | 30 |
| Vibration frequency/kHz of the third step | 40 |
S6, maintaining the male die to press the pole piece layer, opening the female die when the male die, the female die and the pole piece layer are cooled to the temperature lower than 60 ℃, and taking out the pole piece layer;
s7, taking two obtained pole piece layers, coating wet conductive adhesive with the thickness of 6 microns on the surfaces of the pole piece layers, adhering the two pole piece layers to the upper surface and the lower surface of a current collector, applying pressure of 0.15MPa to the two pole piece layers, wherein the pressure faces the current collector, heating the current collector and the two pole piece layers to 110 ℃ in the pressure applying process for 2min, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
s8: and cutting the combined pole piece to obtain the nickel cobalt lithium manganate positive pole piece.
Examples 5,
A positive pole piece, the main material of the positive pole is lithium iron phosphate, and the manufacturing method comprises the following steps:
s1, mixing 65g of lithium iron phosphate, 2g of an electronic conductive agent, 25g of a fast ion conductor and 8g of a binder to obtain raw material powder;
s2, baking the raw material powder at 150 ℃ to remove moisture in the raw material powder;
s3, pouring the raw material powder subjected to moisture removal into a stirring cylinder, and carrying out dry mixing and stirring to obtain raw material powder;
s4, adding the raw material powder into a female die with the groove depth of 0.15mm, scraping the raw material powder by using a scraper and scraping redundant raw material powder;
s5, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder to control the temperature in the female die to be 220 +/-3 ℃, applying stepped pressure to the raw material powder in the female die through the male die, and vibrating the female die along the moving direction of the male die (see table 2) to obtain a pole piece layer;
table 2:
s6, maintaining the male die to press the pole piece layer, opening the female die when the male die, the female die and the pole piece layer are cooled to the temperature lower than 60 ℃, and taking out the pole piece layer;
s7, taking two obtained pole piece layers, coating wet conductive adhesive with the thickness of 6 microns on the surfaces of the pole piece layers, adhering the two pole piece layers to the upper surface and the lower surface of a current collector, applying pressure of 0.15MPa to the two pole piece layers, wherein the pressure faces the current collector, heating the current collector and the two pole piece layers to 110 ℃ in the pressure applying process for 2min, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
s8: and cutting the combined pole piece to obtain the lithium iron phosphate positive pole piece.
Examples 6,
A positive pole piece, the positive pole main material is lithium manganate, its preparation method includes the following steps:
s1, mixing 72.5g of lithium manganate, 1g of electronic conductive agent, 20g of fast ion conductor and 6.5g of binder to obtain raw material powder;
s2, baking the raw material powder at 150 ℃ to remove moisture in the raw material powder;
s3, pouring the raw material powder subjected to moisture removal into a stirring cylinder, and carrying out dry mixing and stirring to obtain raw material powder;
s4, adding the raw material powder into a female die with the groove depth of 0.15mm, scraping the raw material powder by using a scraper and scraping redundant raw material powder;
s5, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder to control the temperature in the female die to be 220 +/-3 ℃, applying stepped pressure to the raw material powder in the female die through the male die, and vibrating the female die along the moving direction of the male die (see table 3) to obtain a pole piece layer;
table 3:
s6, maintaining the male die to press the pole piece layer, opening the female die when the male die, the female die and the pole piece layer are cooled to the temperature lower than 60 ℃, and taking out the pole piece layer;
s7, taking two obtained pole piece layers, coating wet conductive adhesive with the thickness of 6 microns on the surfaces of the pole piece layers, adhering the two pole piece layers to the upper surface and the lower surface of a current collector, applying pressure of 0.15MPa to the two pole piece layers, wherein the pressure faces the current collector, heating the current collector and the two pole piece layers to 110 ℃ in the pressure applying process for 2min, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
s8: and cutting the combined pole piece to obtain the lithium manganate positive pole piece.
Example 7,
A positive pole piece, the main material of the positive pole is lithium cobaltate, and the manufacturing method comprises the following steps:
s1, mixing 84g of lithium cobaltate, 1g of electronic conductive agent, 11g of fast ion conductor and 4g of binder to obtain raw material powder;
s2, baking the raw material powder at 150 ℃ to remove moisture in the raw material powder;
s3, pouring the raw material powder subjected to moisture removal into a stirring cylinder, and carrying out dry mixing and stirring to obtain raw material powder;
s4, adding the raw material powder into a female die with the groove depth of 0.15mm, scraping the raw material powder by using a scraper and scraping redundant raw material powder;
s5, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder to control the temperature in the female die to be 220 +/-3 ℃, applying stepped pressure to the raw material powder in the female die through the male die, and vibrating the female die along the moving direction of the male die (see table 4) to obtain a pole piece layer;
table 4:
| positive electrode main material | Lithium cobaltate |
| Pressure of the first step/MPa | 1.5 |
| First step pressure holding time/s | 120 |
| Vibration frequency/kHz of the first step | 0 |
| pressure/MPa of the second step | 8.5 |
| Second step pressure holding time/s | 30 |
| Vibration frequency/kHz of the second step | 40 |
| pressure/MPa of the third step | 10.5 |
| Third step pressure holding time/s | 30 |
| Vibration frequency/kHz of the third step | 40 |
S6, maintaining the male die to press the pole piece layer, opening the female die when the male die, the female die and the pole piece layer are cooled to the temperature lower than 60 ℃, and taking out the pole piece layer;
s7, taking two obtained pole piece layers, coating wet conductive adhesive with the thickness of 6 microns on the surfaces of the pole piece layers, adhering the two pole piece layers to the upper surface and the lower surface of a current collector, applying pressure of 0.15MPa to the two pole piece layers, wherein the pressure faces the current collector, heating the current collector and the two pole piece layers to 110 ℃ in the pressure applying process for 2min, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
s8: and cutting the combined pole piece to obtain the lithium cobaltate positive pole piece.
Example 8,
A negative pole piece, the main material of the negative pole is graphite, and the manufacturing method comprises the following steps:
s1, 59.5g of graphite, 0.5g of electronic conductive agent, 30g of fast ion conductor and 10g of binder are mixed to obtain raw material powder;
s2, baking the raw material powder at 150 ℃ to remove moisture in the raw material powder;
s3, pouring the raw material powder subjected to moisture removal into a stirring cylinder, and carrying out dry mixing and stirring to obtain raw material powder;
s4, adding the raw material powder into a female die with the groove depth of 0.15mm, scraping the raw material powder by using a scraper and scraping redundant raw material powder;
s5, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder to control the temperature in the female die to be 220 +/-3 ℃, applying stepped pressure to the raw material powder in the female die through the male die, and vibrating the female die along the moving direction of the male die (see table 5) to obtain a pole piece layer;
table 5:
| negative electrode main material | Graphite |
| Pressure of the first step/MPa | 1.5 |
| First step pressure holding time/s | 120 |
| Vibration frequency/kHz of the first step | 0 |
| pressure/MPa of the second step | 4.5 |
| Second step pressure holding time/s | 30 |
| Vibration frequency/kHz of the second step | 40 |
| pressure/MPa of the third step | 6.5 |
| Third step pressure holding time/s | 30 |
| Vibration frequency/kHz of the third step | 40 |
S6, maintaining the male die to press the pole piece layer, opening the female die when the male die, the female die and the pole piece layer are cooled to the temperature lower than 60 ℃, and taking out the pole piece layer;
s7, taking two obtained pole piece layers, coating wet conductive adhesive with the thickness of 6 microns on the surfaces of the pole piece layers, adhering the two pole piece layers to the upper surface and the lower surface of a current collector, applying pressure of 0.15MPa to the two pole piece layers, wherein the pressure faces the current collector, heating the current collector and the two pole piece layers to 110 ℃ in the pressure applying process for 2min, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
s8: and cutting the combined pole piece to obtain the graphite negative pole piece.
Examples 9,
A positive pole piece, the main material of the positive pole is nickel cobalt lithium manganate, and the manufacturing method comprises the following steps:
s1, mixing 77g of nickel cobalt lithium manganate, 1.5g of electronic conductive agent, 16g of fast ion conductor and 5.5g of binder to obtain raw material powder;
s2, baking the raw material powder at 150 ℃ to remove moisture in the raw material powder;
s3, pouring the raw material powder subjected to moisture removal into a stirring cylinder, and carrying out dry mixing and stirring to obtain raw material powder;
s4, adding the raw material powder into a female die with the groove depth of 0.15mm, scraping the raw material powder by using a scraper and scraping redundant raw material powder;
s5, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder to control the temperature in the female die to be 220 +/-3 ℃, applying stepped pressure to the raw material powder in the female die through the male die, and vibrating the female die along the moving direction of the male die (see table 6) to obtain a pole piece layer;
table 6:
| positive electrode main material | Lithium nickel cobalt manganese oxide |
| Pressure of the first step/MPa | 1 |
| First step pressure holding time/s | 120 |
| Vibration frequency/kHz of the first step | 0 |
| pressure/MPa of the second step | 6 |
| Second step pressure holding time/s | 30 |
| Vibration frequency/kHz of the second step | 40 |
| pressure/MPa of the third step | 10 |
| Third step pressure holding time/s | 30 |
| Vibration frequency/kHz of the third step | 40 |
S6, maintaining the male die to press the pole piece layer, opening the female die when the male die, the female die and the pole piece layer are cooled to the temperature lower than 60 ℃, and taking out the pole piece layer;
s7, taking two obtained pole piece layers, coating wet conductive adhesive with the thickness of 6 microns on the surfaces of the pole piece layers, adhering the two pole piece layers to the upper surface and the lower surface of a current collector, applying pressure of 0.15MPa to the two pole piece layers, wherein the pressure faces the current collector, heating the current collector and the two pole piece layers to 110 ℃ in the pressure applying process for 2min, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
s8: and cutting the combined pole piece to obtain the nickel cobalt lithium manganate positive pole piece.
Examples 10,
A positive pole piece, the main material of the positive pole is nickel cobalt lithium manganate, and the manufacturing method comprises the following steps:
s1, mixing 77g of nickel cobalt lithium manganate, 1.5g of electronic conductive agent, 16g of fast ion conductor and 5.5g of binder to obtain raw material powder;
s2, baking the raw material powder at 150 ℃ to remove moisture in the raw material powder;
s3, pouring the raw material powder subjected to moisture removal into a stirring cylinder, and carrying out dry mixing and stirring to obtain raw material powder;
s4, adding the raw material powder into a female die with the groove depth of 0.15mm, scraping the raw material powder by using a scraper and scraping redundant raw material powder;
s5, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder to control the temperature in the female die to be 220 +/-3 ℃, applying stepped pressure to the raw material powder in the female die through the male die, and vibrating the female die along the moving direction of the male die (see table 7) to obtain a pole piece layer;
table 7:
| positive electrode main material | Lithium nickel cobalt manganese oxide |
| Pressure of the first step/MPa | 3 |
| First step pressure holding time/s | 120 |
| Vibration frequency/kHz of the first step | 0 |
| pressure/MPa of the second step | 8 |
| Second step pressure holding time/s | 30 |
| Vibration frequency/kHz of the second step | 40 |
| pressure/MPa of the third step | 12 |
| Third step pressure holding time/s | 30 |
| Vibration frequency/kHz of the third step | 40 |
S6, maintaining the male die to press the pole piece layer, opening the female die when the male die, the female die and the pole piece layer are cooled to the temperature lower than 60 ℃, and taking out the pole piece layer;
s7, taking two obtained pole piece layers, coating wet conductive adhesive with the thickness of 6 microns on the surfaces of the pole piece layers, adhering the two pole piece layers to the upper surface and the lower surface of a current collector, applying pressure of 0.15MPa to the two pole piece layers, wherein the pressure faces the current collector, heating the current collector and the two pole piece layers to 110 ℃ in the pressure applying process for 2min, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
s8: and cutting the combined pole piece to obtain the nickel cobalt lithium manganate positive pole piece.
Examples 11,
A positive pole piece, the main material of the positive pole is nickel cobalt lithium manganate, and the manufacturing method comprises the following steps:
s1, mixing 77g of nickel cobalt lithium manganate, 1.5g of electronic conductive agent, 16g of fast ion conductor and 5.5g of binder to obtain raw material powder;
s2, baking the raw material powder at 150 ℃ to remove moisture in the raw material powder;
s3, pouring the raw material powder subjected to moisture removal into a stirring cylinder, and carrying out dry mixing and stirring to obtain raw material powder;
s4, adding the raw material powder into a female die with the groove depth of 0.15mm, scraping the raw material powder by using a scraper and scraping redundant raw material powder;
s5, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder to control the temperature in the female die to be 220 +/-3 ℃, applying stepped pressure to the raw material powder in the female die through the male die, and vibrating the female die along the moving direction of the male die (see table 8) to obtain a pole piece layer;
table 8:
s6, maintaining the male die to press the pole piece layer, opening the female die when the male die, the female die and the pole piece layer are cooled to the temperature lower than 60 ℃, and taking out the pole piece layer;
s7, taking two obtained pole piece layers, coating wet conductive adhesive with the thickness of 6 microns on the surfaces of the pole piece layers, adhering the two pole piece layers to the upper surface and the lower surface of a current collector, applying pressure of 0.15MPa to the two pole piece layers, wherein the pressure faces the current collector, heating the current collector and the two pole piece layers to 110 ℃ in the pressure applying process for 2min, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
s8: and cutting the combined pole piece to obtain the nickel cobalt lithium manganate positive pole piece.
Examples 12,
A positive pole piece, the main material of the positive pole is nickel cobalt lithium manganate, and the manufacturing method comprises the following steps:
s1, mixing 77g of nickel cobalt lithium manganate, 1.5g of electronic conductive agent, 16g of fast ion conductor and 5.5g of binder to obtain raw material powder;
s2, baking the raw material powder at 150 ℃ to remove moisture in the raw material powder;
s3, pouring the raw material powder subjected to moisture removal into a stirring cylinder, and carrying out dry mixing and stirring to obtain raw material powder;
s4, adding the raw material powder into a female die with the groove depth of 0.15mm, scraping the raw material powder by using a scraper and scraping redundant raw material powder;
s5, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder to control the temperature in the female die to be 220 +/-3 ℃, applying stepped pressure to the raw material powder in the female die through the male die, and vibrating the female die along the moving direction of the male die (see table 9) to obtain a pole piece layer;
table 9:
s6, maintaining the male die to press the pole piece layer, opening the female die when the male die, the female die and the pole piece layer are cooled to the temperature lower than 60 ℃, and taking out the pole piece layer;
s7, taking two obtained pole piece layers, coating wet conductive adhesive with the thickness of 6 microns on the surfaces of the pole piece layers, adhering the two pole piece layers to the upper surface and the lower surface of a current collector, applying pressure of 0.15MPa to the two pole piece layers, wherein the pressure faces the current collector, heating the current collector and the two pole piece layers to 110 ℃ in the pressure applying process for 2min, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
s8: and cutting the combined pole piece to obtain the nickel cobalt lithium manganate positive pole piece.
Examples 13,
A positive pole piece, the main material of the positive pole is nickel cobalt lithium manganate, and the manufacturing method comprises the following steps:
s1, mixing 77g of nickel cobalt lithium manganate, 1.5g of electronic conductive agent, 16g of fast ion conductor and 5.5g of binder to obtain raw material powder;
s2, baking the raw material powder at 150 ℃ to remove moisture in the raw material powder;
s3, pouring the raw material powder subjected to moisture removal into a stirring cylinder, and carrying out dry mixing and stirring to obtain raw material powder;
s4, adding the raw material powder into a female die with the groove depth of 0.15mm, scraping the raw material powder by using a scraper and scraping redundant raw material powder;
s5, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder to control the temperature in the female die to be 220 +/-3 ℃, applying stepped pressure to the raw material powder in the female die through the male die, and vibrating the female die along the moving direction of the male die (see table 10) to obtain a pole piece layer;
table 10:
| positive electrode main material | Lithium nickel cobalt manganese oxide |
| Pressure of the first step/ |
2 |
| First step pressure holding time/s | 120 |
| Vibration frequency/kHz of the first step | 0 |
| pressure/MPa of the second step | 7 |
| Second step pressure holding time/s | 30 |
| Vibration frequency/kHz of the second step | 30 |
| pressure/MPa of the third step | 11 |
| Third step pressure holding time/s | 30 |
| Vibration frequency/kHz of the third step | 30 |
S6, maintaining the male die to press the pole piece layer, opening the female die when the male die, the female die and the pole piece layer are cooled to the temperature lower than 60 ℃, and taking out the pole piece layer;
s7, taking two obtained pole piece layers, coating wet conductive adhesive with the thickness of 6 microns on the surfaces of the pole piece layers, adhering the two pole piece layers to the upper surface and the lower surface of a current collector, applying pressure of 0.15MPa to the two pole piece layers, wherein the pressure faces the current collector, heating the current collector and the two pole piece layers to 110 ℃ in the pressure applying process for 2min, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
s8: and cutting the combined pole piece to obtain the nickel cobalt lithium manganate positive pole piece.
Examples 14,
A positive pole piece, the main material of the positive pole is nickel cobalt lithium manganate, and the manufacturing method comprises the following steps:
s1, mixing 77g of nickel cobalt lithium manganate, 1.5g of electronic conductive agent, 16g of fast ion conductor and 5.5g of binder to obtain raw material powder;
s2, baking the raw material powder at 150 ℃ to remove moisture in the raw material powder;
s3, pouring the raw material powder subjected to moisture removal into a stirring cylinder, and carrying out dry mixing and stirring to obtain raw material powder;
s4, adding the raw material powder into a female die with the groove depth of 0.15mm, scraping the raw material powder by using a scraper and scraping redundant raw material powder;
s5, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder to control the temperature in the female die to be 220 +/-3 ℃, applying stepped pressure to the raw material powder in the female die through the male die, and vibrating the female die along the moving direction of the male die (see table 11) to obtain a pole piece layer;
table 11:
| positive electrode main material | Lithium nickel cobalt manganese oxide |
| Pressure of the first step/ |
2 |
| First step pressure holding time/s | 120 |
| Vibration frequency/kHz of the first step | 10 |
| Pressure of the second step/MPa | 7 |
| Second step pressure holding time/s | 30 |
| Vibration frequency/kHz of the second step | 50 |
| pressure/MPa of the third step | 11 |
| Third step pressure holding time/s | 30 |
| Vibration frequency/kHz of the third step | 50 |
S6, maintaining the male die to press the pole piece layer, opening the female die when the male die, the female die and the pole piece layer are cooled to the temperature lower than 60 ℃, and taking out the pole piece layer;
s7, taking two obtained pole piece layers, coating wet conductive adhesive with the thickness of 6 microns on the surfaces of the pole piece layers, adhering the two pole piece layers to the upper surface and the lower surface of a current collector, applying pressure of 0.15MPa to the two pole piece layers, wherein the pressure faces the current collector, heating the current collector and the two pole piece layers to 110 ℃ in the pressure applying process for 2min, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
s8: and cutting the combined pole piece to obtain the nickel cobalt lithium manganate positive pole piece.
Comparative examples 1,
A positive pole piece, the main material of the positive pole is nickel cobalt lithium manganate, and the manufacturing method is as follows:
s1, mixing a proper amount of nickel cobalt lithium manganate, an electronic conductive agent and a binder with a solvent to obtain slurry;
s2, coating the slurry on one surface of the current collector by adopting a coating machine, and baking for 3min by using a baking oven;
s3, turning over the current collector, coating the slurry on the other surface of the current collector by adopting a coating machine, and baking for 3min by using a baking oven to obtain a combined pole piece;
s4, rolling the obtained combined pole piece by using a roller press;
s5: and cutting the combined pole piece to obtain the nickel cobalt lithium manganate positive pole piece.
Comparative examples 2,
A positive pole piece, the main material of the positive pole is lithium iron phosphate, and the manufacturing method comprises the following steps:
s1, mixing a proper amount of lithium iron phosphate, an electronic conductive agent and a binder with a solvent to obtain slurry;
s2, coating the slurry on one surface of the current collector by adopting a coating machine, and baking for 3min by using a baking oven;
s3, turning over the current collector, coating the slurry on the other surface of the current collector by adopting a coating machine, and baking for 3min by using a baking oven to obtain a combined pole piece;
s4, rolling the obtained combined pole piece by using a roller press;
s5: and cutting the combined pole piece to obtain the lithium iron phosphate positive pole piece.
Comparative examples 3,
A positive pole piece, the positive pole main material is lithium manganate, its preparation method is as follows:
s1, mixing a proper amount of lithium manganate, an electronic conductive agent and a binder with a solvent to obtain slurry;
s2, coating the slurry on one surface of the current collector by adopting a coating machine, and baking for 3min by using a baking oven;
s3, turning over the current collector, coating the slurry on the other surface of the current collector by adopting a coating machine, and baking for 3min by using a baking oven to obtain a combined pole piece;
s4, rolling the obtained combined pole piece by using a roller press;
s5: and cutting the combined pole piece to obtain the lithium manganate positive pole piece.
Comparative examples 4,
A positive pole piece, the main material of the positive pole is lithium cobaltate, and the manufacturing method comprises the following steps:
s1, mixing a proper amount of lithium cobaltate, an electronic conductive agent and a binder with a solvent to obtain slurry;
s2, coating the slurry on one surface of the current collector by adopting a coating machine, and baking for 3min by using a baking oven;
s3, turning over the current collector, coating the slurry on the other surface of the current collector by adopting a coating machine, and baking for 3min by using a baking oven to obtain a combined pole piece;
s4, rolling the obtained combined pole piece by using a roller press;
s5: and cutting the combined pole piece to obtain the lithium cobaltate positive pole piece.
Comparative examples 5,
A negative pole piece, the main material of the negative pole is graphite, and the manufacturing method comprises the following steps:
s1, mixing a proper amount of graphite, an electronic conductive agent and a binder with a solvent to obtain slurry;
s2, coating the slurry on one surface of the current collector by adopting a coating machine, and baking for 3min by using a baking oven;
s3, turning over the current collector, coating the slurry on the other surface of the current collector by adopting a coating machine, and baking for 3min by using a baking oven to obtain a combined pole piece;
s4, rolling the obtained combined pole piece by using a roller press;
s5: and cutting the combined pole piece to obtain the graphite negative pole piece.
Comparative examples 6,
A positive pole piece, the main material of the positive pole is nickel cobalt lithium manganate, and the manufacturing method comprises the following steps:
s1, mixing 77g of nickel cobalt lithium manganate, 1.5g of electronic conductive agent, 16g of fast ion conductor and 5.5g of binder to obtain raw material powder;
s2, baking the raw material powder at 150 ℃ to remove moisture in the raw material powder;
s3, pouring the raw material powder subjected to moisture removal into a stirring cylinder, and carrying out dry mixing and stirring to obtain raw material powder;
s4, adding the raw material powder into a female die with the groove depth of 0.15mm, scraping the raw material powder by using a scraper and scraping redundant raw material powder;
s5, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder to control the temperature in the female die to be 220 +/-3 ℃, and applying stepped pressure (see table 12) to the raw material powder in the female die through the male die to obtain a pole piece layer;
table 12:
| positive electrode main material | Lithium nickel cobalt manganese oxide |
| Pressure of the first step/ |
2 |
| First step pressure holding time/s | 120 |
| Vibration frequency/kHz of the first step | 0 |
| pressure/MPa of the second step | 7 |
| Second step pressure holding time/s | 30 |
| Vibration frequency/kHz of the second step | 0 |
| pressure/MPa of the third step | 11 |
| Third step pressure holding time/s | 30 |
| Vibration frequency/kHz of the third step | 0 |
S6, maintaining the male die to press the pole piece layer, opening the female die when the male die, the female die and the pole piece layer are cooled to the temperature lower than 60 ℃, and taking out the pole piece layer;
s7, taking two obtained pole piece layers, coating wet conductive adhesive with the thickness of 6 microns on the surfaces of the pole piece layers, adhering the two pole piece layers to the upper surface and the lower surface of a current collector, applying pressure of 0.15MPa to the two pole piece layers, wherein the pressure faces the current collector, heating the current collector and the two pole piece layers to 110 ℃ in the pressure applying process for 2min, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
s8: and cutting the combined pole piece to obtain the nickel cobalt lithium manganate positive pole piece.
Comparative examples 7,
A negative pole piece, the main material of the negative pole is graphite, and the manufacturing method comprises the following steps:
s1, 59.5g of graphite, 0.5g of electronic conductive agent, 30g of fast ion conductor and 10g of binder are mixed to obtain raw material powder;
s2, baking the raw material powder at 150 ℃ to remove moisture in the raw material powder;
s3, pouring the raw material powder subjected to moisture removal into a stirring cylinder, and carrying out dry mixing and stirring to obtain raw material powder;
s4, adding the raw material powder into a female die with the groove depth of 0.15mm, scraping the raw material powder by using a scraper and scraping redundant raw material powder;
s5, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder to control the temperature in the female die to be 220 +/-3 ℃, and applying stepped pressure (see table 13) to the raw material powder in the female die through the male die to obtain a pole piece layer;
table 13:
| negative electrode main material | Graphite |
| Pressure of the first step/MPa | 1.5 |
| First step pressure holding time/s | 120 |
| Vibration frequency/kHz of the first step | 0 |
| pressure/MPa of the second step | 4.5 |
| Second step pressure holding time/s | 30 |
| Vibration frequency/kHz of the second step | 0 |
| pressure/MPa of the third step | 6.5 |
| Third step pressure holding time/s | 30 |
| Vibration frequency/kHz of the third step | 0 |
S6, maintaining the male die to press the pole piece layer, opening the female die when the male die, the female die and the pole piece layer are cooled to the temperature lower than 60 ℃, and taking out the pole piece layer;
s7, taking two obtained pole piece layers, coating wet conductive adhesive with the thickness of 6 microns on the surfaces of the pole piece layers, adhering the two pole piece layers to the upper surface and the lower surface of a current collector, applying pressure of 0.15MPa to the two pole piece layers, wherein the pressure faces the current collector, heating the current collector and the two pole piece layers to 110 ℃ in the pressure applying process for 2min, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
s8: and cutting the combined pole piece to obtain the graphite negative pole piece.
The results of the tests of examples 4 to 14 and comparative examples 1 to 7 are shown in Table 14.
TABLE 14
| Average porosity (by hexadecane quality soaking quality 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％ |
Comparing the average porosity of the embodiments 4 to 8 with the average porosity of the comparative examples 1 to 5 shows that the porosity of the electrode sheet layer on the battery electrode sheet obtained by the manufacturing method of the battery electrode sheet is much smaller than the porosity of the electrode sheet layer on the battery electrode sheet obtained by the slurry method, when the battery electrode sheet obtained by the manufacturing method of the battery electrode sheet is assembled on a solid-state battery, good interface contact can be formed between the battery electrode sheet and the solid-state electrolyte, the interface impedance is small, the conductivity of the finished solid-state battery is favorably improved, and the stability and the safety of the finished solid-state battery are favorably improved.
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 the contact probability between particles of the raw material powder can be effectively increased by assisting with vibration in the process of compacting the raw material powder, the particles of the raw material powder are uniformly distributed, the porosity inside the obtained pole piece layer is reduced, the number of pores on the surface of the obtained pole piece layer is reduced, the density of the pole piece layer is further improved, and the obtained pole piece layer can meet the expected effect of high quality.
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 the contact probability among raw material powder particles can be effectively improved by increasing the pressure, and the average porosity of the obtained pole piece layer is reduced, and through practical tests, if the pressure is further increased, the change of the average porosity of the pole piece layer is small, and is basically maintained between 3.06% and 3.14%.
As can be seen by comparing the average porosity of example 4, the average porosity of example 11, and the average porosity of example 12, the reduction of the average porosity of the resulting pole piece layer was somewhat facilitated by extending the pressure hold time, but continued extension of the pressure hold time after the pressure hold time reached a certain value did not significantly aid the average porosity of the resulting pole piece layer.
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 contact probability among the raw material powder particles can be effectively increased and the particles of the raw material powder can be uniformly distributed by assisting with vibration during the process of compacting the raw material powder, but after the vibration frequency reaches a certain value, continuing to increase the vibration frequency does not significantly contribute to the average porosity of the obtained pole piece layer.
Compared with the prior art, the battery pole piece has the advantages that solid raw materials of the pole piece layer are mixed and are subjected to dry mixing and stirring in a fully dry powder state to obtain raw material powder, then the raw material powder is quantitatively added and paved in the female die of the pole piece die to be compacted, heating is matched in the compacting process, the pole piece layer is obtained after the raw material powder is compacted, compared with the conventional slurry method, no solvent is required to be added, the obtained pole piece layer has higher density and can form good interface contact with solid electrolyte, so that the conductivity of a finished solid battery is improved, and the stability and the safety of the finished solid battery are improved
Although preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A manufacturing method of a battery pole piece is characterized by comprising the following steps: the method comprises the following steps:
s1, mixing the solid raw materials of the pole piece layer to obtain raw material powder;
s2, dry-mixing and stirring the raw material powder to obtain raw material powder;
s3, quantitatively adding and paving the raw material powder into a female die of a pole piece die;
s4, controlling the male die of the pole piece die to move and close the female die, heating the male die, the female die and the raw material powder, and compacting the raw material powder in the female die through the male die to obtain a pole piece layer;
s5, maintaining the male die to press the pole piece layer, opening the female die after the male die, the female die and the pole piece layer are cooled, and taking out the pole piece layer;
s6, coating a conductive adhesive on one surface of the pole piece layer, adhering the pole piece layer to the surface of the current collector through the conductive adhesive, pressing the pole piece layer and the current collector, heating the pole piece layer and the current collector simultaneously, and obtaining a combined pole piece after the conductive adhesive is dried and cured;
and S7, cutting the combined pole piece to obtain the battery pole piece.
2. The method for manufacturing the battery pole piece according to claim 1, characterized in that: the solid raw materials in the step S1 include a positive electrode main material, an electronic conductive agent, a fast ion conductor, and a binder.
3. The method for manufacturing the battery pole piece according to claim 1, characterized in that: the solid raw material in the step S1 includes a negative electrode main material, an electron conductive agent, a fast ion conductor, and a binder.
4. The method for manufacturing the battery pole piece according to claim 1, characterized in that: the thickness of the raw material powder added into the female die in the step 3 is 1.3-1.5 times of the thickness of the pole piece layer in the step 4.
5. The method for manufacturing the battery pole piece according to claim 1, characterized in that: the heating temperature in the step S4 is 170 to 260 ℃.
6. The method for manufacturing the battery pole piece according to claim 1, characterized in that: in the step S4, the pressure of the convex die on the raw material powder is increased in a step-like manner, and the maximum pressure value of the pressure is not more than 20 MPa.
7. The method for manufacturing the battery pole piece according to claim 6, wherein the method comprises the following steps: the step S4 is that the pressure exerted on the raw material powder by the convex die is divided into three steps:
a1, the pressure of the male die on the raw material powder in the female die is 1MPa to 4MPa, and the pressure is maintained for 100s to 140 s;
a2, the pressure of the male die on the raw material powder in the female die is 4MPa to 10MPa, and the pressure is maintained for 20s to 40 s;
a3, the pressure of the male die on the raw material powder in the female die is 6MPa to 12MPa, and the pressure is maintained for 20s to 40 s.
8. The method for manufacturing the battery pole piece according to claim 1, characterized in that: in the process of molding the solid powder material by the male mold in the step S4, the female mold is vibrated in the moving direction of the male mold.
9. The method for manufacturing the battery pole piece according to claim 8, wherein the method comprises the following steps: and the vibration frequency of the female die in the step S4 is not more than 200 MHz.
10. A battery pole piece is characterized in that: the battery pole piece obtained by the manufacturing method of the battery pole piece according to any one of claims 1 to 9.
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