CN112670434A - Method for preparing flexible film electrode on large scale by integrated working platform - Google Patents
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Abstract
The invention provides a method for preparing a flexible thin film electrode on a large scale by an integrated working platform, which comprises the steps of firstly weighing active substances, a conductive agent and a binding agent in a preset mass proportion, adding the active substances, the conductive agent and the binding agent into a preset solvent, and preparing electrode slurry with preset solid content by ball milling or magnetic stirring; and then injecting the electrode slurry into an integrated working platform, and performing coating, segmented temperature control drying, peeling and rolling to realize large-scale continuous preparation of the flexible film electrode. The method provided by the invention realizes the large-scale preparation of the independent self-supporting flexible film electrode by using a coating method without a current collector, the preparation process is integrally completed, and the preparation method is simple. The flexible film electrode prepared by the invention has good flexibility, can be folded repeatedly, also eliminates the inevitable powder dropping phenomenon caused by the traditional method for preparing the electrode by loading active substances on the current collector, has excellent electrochemical performance, has huge application prospect, and is suitable for large-scale industrial production.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method for preparing a flexible thin film electrode on a large scale by using an integrated working platform.
Background
In recent years, successful mass production of flexible display screens has opened a new era of flexible electronic products. However, the development of flexible electronic products such as flexible display devices with power supplies, wearable electronic devices, active radio frequency electronic identification tags and sensors cannot depart from flexible power supplies. With the rapid development of these flexible electronic products, there is a need for high-capacity flexible batteries that can continuously supply and store energy for these devices even when the mechanical deformation degree is large. This flexibility is difficult in conventional cell designs, which stack, compress and seal multiple components (positive, separator, negative). Therefore, the flexibility is poor, and even slight curling causes delamination and damage of components, reduces the electrochemical performance of the battery, and even causes the battery to be disconnected and unusable.
Lithium ion batteries occupy a dominant position in flexible wearable devices due to their high energy density, high voltage window, long life and environmental friendliness. However, when the traditional lithium ion battery electrode material is deformed such as bending and kinking, the electrode material is very easy to wrinkle and even crack due to weak interface acting force between the electrode material and the current collector, so that the electrode material cannot recover after being deformed, the performance of the battery is reduced rapidly, the service life of the battery is greatly shortened, and potential safety hazards are caused. In the prior art, the preparation method of the flexible electrode is complex, the preparation time of the material is long, and the adhesive force of the active material and the current collector of the electrode prepared by the traditional coating method cannot meet the use standard of flexibility.
The invention patent with the application number of CN201810895450.X discloses a flexible electrode and a preparation method and application thereof. Weighing 40-90 parts of polyvinylidene fluoride, 10-30 parts of conductive carbon material, 0.001-20 parts of active substance and 5-30 parts of polyethylene glycol, and crushing to prepare mixed powder; then adding a solvent for mixing and processing to obtain uniform slurry; and then heating and drying the slurry to prepare an electrode plate, and fixedly connecting a lead with the electrode plate to finish the preparation of the flexible electrode. The method makes the adhesive become a main body material to obtain a flexible base material with certain mechanical strength, and adds a certain proportion of conductive carbon material to make the flexible base body have the performance of a conductor. However, although the mechanical properties of the flexible electrode prepared by the method are improved, the requirement of equipment for high capacity of the electrode is far not met, and large-scale mass production cannot be realized.
The invention patent with the application number of CN201610873655.9 discloses a flexible integrated film electrode and a preparation method thereof, wherein electrode active substances, a conductive agent, a binder and a solvent are uniformly mixed to prepare electrode slurry; adhering the electrode slurry to one side of the diaphragm to form an electrode layer, and drying; uniformly mixing the conductive material, the binder and the solvent to prepare conductive slurry; and adhering the conductive slurry on the electrode layer, pressing the tab or the tab leading-out strip on the conductive slurry to form a conductive layer, and drying to obtain the flexible integrated film electrode. The method adopts a conductive material which can be adhered on the diaphragm together with an electrode material to replace a metal foil as a current collector of the electrode to prepare the anode-diaphragm integrated electrode. However, the method has the following disadvantages: the preparation method is complex, the prepared electrode is formed by compounding multiple layers, the components are layered and damaged due to repeated folding, the electrochemical performance of the battery is reduced, and large-scale mass production cannot be realized.
The invention patent with the application number of CN201811071209.1 discloses a preparation method of a flexible current collector-free film pole piece for a lithium ion battery, which comprises the steps of uniformly mixing an active substance, a conductive agent, a binder and a solvent to prepare slurry; then coating the surface of the smooth and hydrophobic sapphire substrate to form a continuous film, and drying; then soaking the film in deionized water, and enabling the film to fall off from the surface of the sapphire substrate by a mechanical method; and finally, fishing the falling film out of the water by using a copper mesh, and drying to obtain the flexible current collector-free film pole piece. The flexible current collector-free thin film pole piece prepared by the method can be self-supported and has good mechanical strength and flexibility. However, the method has the following disadvantages: the preparation method is complex, the process is limited, and large-scale mass production cannot be realized by continuous collection.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method for preparing a flexible thin film electrode on a large scale by using an integrated working platform.
In order to solve the above-mentioned object, the present invention provides a method for preparing a flexible thin film electrode by using a large-scale mold of an integrated working platform, which comprises the following steps: the method comprises the following steps:
s1, preparing electrode slurry: weighing active substances, a conductive agent and a binder in a predetermined mass ratio, adding the active substances, the conductive agent and the binder into a predetermined solvent, and preparing electrode slurry with a predetermined solid content by ball milling or magnetic stirring;
and S2, injecting the electrode slurry into an integrated working platform, and sequentially carrying out coating, drying, peeling and rolling to obtain the flexible film electrode, thereby realizing large-scale continuous preparation of the flexible film electrode.
Further, the integrated working platform comprises a conveying belt arranged along the horizontal direction, a slurry hopper, a scraper for coating and a drying box, wherein the slurry hopper, the scraper and the drying box are sequentially arranged above the conveying belt; the integrated working platform also comprises a double-roller coiling machine for continuously collecting the flexible film electrode; the drying box is a sectional type drying box, and the temperature and the air speed of each section are independently adjusted.
Further, the step S2 includes the following steps:
s21, coating: placing continuous substrates on the conveyor belt, injecting the electrode slurry into the slurry hopper, and conveying the substrates loaded with the electrode slurry to the position right below the scraper by the conveyor belt for continuous coating;
s22, drying: conveying the substrate coated in the step S21 into the sectional type drying box through the conveyor belt at a conveying speed of 0.1-20 m/min, and performing sectional type temperature control drying; the sectional type drying box comprises three sections, wherein the drying temperature of the first section is as follows: the temperature is 0-35 ℃, and the air speed of the first section is 0-3 m/s; the drying temperature of the second section is 35-100 ℃, and the air speed of the second section is 2-4 m/s; the drying temperature of the third section is 80-130 ℃, and the air speed of the third section is 0-5 m/s.
S23, peeling and rolling: and (5) enabling the substrate dried in the step (S22) to pass through the double-roller winding machine, peeling the dried and molded flexible film electrode from the substrate, and winding to realize continuous collection.
Further, in the coating process of step S21, the coating thickness is 10 to 800 μm.
Further, in step S1, the mass ratio of the active material to the conductive agent is 45:1 to 5: 1; the mass ratio of the active substance to the binder is 7: 2-9: 0.5; the solid content of the electrode slurry is 100-1000 mg/mL.
Further, the active substance is one of lithium iron phosphate, ternary materials, lithium cobaltate, lithium titanate, graphite and silicon carbon.
Further, the conductive agent is one or a mixture of more of carbon nanotubes, graphene, carbon fibers, acetylene black, carbon black and ketjen black.
Further, the binder is one or a mixture of PU, PAN, PEDOT and PSS.
Further, the solvent is one or more of THF, NMP and DMF.
Further, the substrate is one of release paper, a PET substrate and a PP substrate.
Further, the rotation speed of the ball milling is 250-600 revolutions per minute, and the ball milling time is 0.5-24 hours.
Further, the rotating speed of the magnetic stirring is 500-1000 revolutions per minute, and the stirring time is 4-10 hours.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the method for preparing the flexible film electrode on a large scale by using the integrated working platform, the conveyor belt arranged along the horizontal direction, the coating device (the slurry funnel and the scraper) sequentially arranged above the conveyor belt, the segmented temperature control type drying box and the double-roller winding machine are adopted to form the integrated working platform, so that the large-scale continuous preparation of the flexible film electrode is realized, namely, the preparation of the independent self-supporting flexible film electrode can be satisfied without collecting fluid in large-scale production by using a coating method, the preparation process is integrally completed, and the preparation method is simple. The method has huge prospect in the application of large-scale preparation of the flexible electrode, and has great significance for the development and popularization of the flexible battery.
2. According to the method for preparing the flexible film electrode on a large scale by using the integrated working platform, the prepared flexible electrode has good flexibility, can be repeatedly folded, does not need a current collector, eliminates the inevitable powder falling defect caused by the traditional electrode preparation through the current collector, and has excellent electrochemical performance.
3. The method for preparing the flexible film electrode on a large scale by the integrated working platform adopts a segmented temperature control type drying process, and the temperature control drying is carried out at the front segment, so that the controllable volatilization of a solvent is ensured, and the film forming quality of a self-supporting flexible film is ensured; controlling the temperature at the middle section, further removing residual solvent, increasing the strength of the film, weakening the adhesive force between the film and the substrate, and facilitating the later-stage film winding; and controlling the temperature at the tail end to ensure that the solvent and the water are completely volatilized.
4. The invention provides a method for preparing a flexible film electrode on a large scale by an integrated working platform, which adopts a separating roller and a double-roller coiler to continuously strip and collect the flexible film electrode, and has the following mechanism: the binder has good film forming effect and poor adhesion with the substrate, and the content of the binder ensures the strength of the flexible film and the selection of the flexible substrate, which provides conditions for subsequent serialization and large-scale winding. In the film forming process, the solvent is volatilized, the active substance and the binder are integrated into a film, and in the high-temperature baking of the later section, the adhesive force of the large-area integrated film on the substrate is gradually weakened until the large-area integrated film is easily peeled off.
Drawings
Fig. 1 is a structural diagram of a large-scale preparation of a flexible thin film electrode by using an integrated working platform provided by the invention.
Fig. 2 is a graph showing the cycle stability test of the flexible thin film electrode prepared in example 1 of the present invention.
Fig. 3 is a diagram of a flexible thin film electrode prepared in example 2 of the present invention.
FIG. 4 is an SEM photograph of a flexible thin film electrode of example 3 of the present invention, with a 2 μm scale.
Fig. 5 is a stress-strain curve diagram of the flexible thin film electrode prepared in example 3 of the present invention.
Fig. 6 is a graph illustrating the rate capability test of the flexible thin film electrode prepared in example 4 of the present invention.
FIG. 7 is an SEM photograph of a flexible thin film electrode of example 5 of the present invention, with a scale of 10 μm.
Reference numerals:
1. a conveyor belt; 2. a slurry hopper; 3. a scraper; 4. a belt pulley; 5. leveling rollers; 6. a drying oven; 7. a separation roller; 8. a double-roller coiler; 9. a substrate; 10. a flexible thin film electrode; 11. a first temperature meter; 12. a first hygrometer; 13. a second temperature meter; 14. a second hygrometer; 15. a third thermometer; 16. and a third humidity meter.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Referring to fig. 1, the integrated working platform provided by the present invention comprises a conveyor belt 1, a slurry hopper 2, a scraper 3, a belt pulley 4, a leveling roller 5, a drying box 6, a separation roller 7, a double-roller winding machine 8, a first temperature meter 11, a first humidity meter 12, a second temperature meter 13, a second humidity meter 14, a third temperature meter 15, and a third humidity meter 16.
The integrated working platform comprises a conveying belt 1 arranged along the horizontal direction, a slurry hopper 2 sequentially arranged above the conveying belt 1, a scraper 3 for coating and a drying box 6; the integrated working platform also comprises a double-roller coiling machine 8 for continuously collecting the flexible film electrode; the drying box 6 is a sectional type drying box and is divided into three sections, each section is respectively provided with a temperature meter, a humidity meter and a fan (not marked in the figure), and the temperature and the wind speed of each section are independently adjusted.
The invention provides a method for preparing a flexible film electrode on a large scale by an integrated working platform, which comprises the following steps: comprises the following steps:
s1, preparing electrode slurry: weighing active substances, a conductive agent and a binder in a predetermined mass ratio, adding the active substances, the conductive agent and the binder into a predetermined solvent, and preparing electrode slurry with a predetermined solid content by ball milling or magnetic stirring;
and S2, injecting the electrode slurry into an integrated working platform, and sequentially carrying out coating, drying, peeling and rolling to obtain the flexible film electrode, thereby realizing large-scale continuous preparation of the flexible film electrode.
Further, the integrated working platform comprises a conveying belt arranged along the horizontal direction, a slurry hopper, a scraper for coating and a drying box, wherein the slurry hopper, the scraper and the drying box are sequentially arranged above the conveying belt; the integrated working platform also comprises a double-roller coiling machine for continuously collecting the flexible film electrode; the drying box is a sectional type drying box, and the temperature and the air speed of each section are independently adjusted.
Further, the step S2 includes the following steps:
s21, coating: placing continuous substrates on the conveyor belt, injecting the electrode slurry into the slurry hopper, and conveying the substrates loaded with the electrode slurry to the position right below the scraper by the conveyor belt for continuous coating;
s22, drying: conveying the substrate coated in the step S21 into the sectional type drying box through the conveyor belt at a conveying speed of 0.1-20 m/min, and performing sectional type temperature control drying; the sectional type drying box comprises three sections, wherein the drying temperature of the first section is as follows: the temperature is 0-35 ℃, and the air speed of the first section is 0-3 m/s; the drying temperature of the second section is 35-100 ℃, and the air speed of the second section is 2-4 m/s; the drying temperature of the third section is 80-130 ℃, and the air speed of the third section is 0-5 m/s;
s23, peeling and rolling: and (5) enabling the substrate dried in the step (S22) to pass through the double-roller winding machine, peeling the dried and molded flexible film electrode from the substrate, and winding to realize continuous collection.
Further, in the coating process of step S21, the coating thickness is 10 to 800 μm.
Further, in step S1, the mass ratio of the active material to the conductive agent is 45:1 to 5: 1; the mass ratio of the active substance to the binder is 7: 2-9: 0.5; the solid content of the electrode slurry is 100-1000 mg/mL.
Further, the active substance is one of lithium iron phosphate, ternary materials, lithium cobaltate, lithium titanate, graphite and silicon carbon.
Further, the conductive agent is one or a mixture of more of carbon nanotubes, graphene, carbon fibers, acetylene black, carbon black and ketjen black.
Further, the binder is one or a mixture of PU, PAN, PEDOT and PSS.
Further, the solvent is one or more of THF, NMP and DMF.
Further, the substrate is one of release paper, a PET substrate and a PP substrate.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Example 1
S1, preparing electrode slurry: weighing lithium cobaltate, a carbon nano tube and PU in a mass ratio of 15:3:2, adding into THF, and performing ball milling dispersion treatment for 1h by a ball mill at a rotating speed of 300 r/min to prepare electrode slurry with a solid content of 133 mg/mL.
S2, injecting the electrode slurry into an integrated working platform, coating, drying, peeling and rolling to obtain the flexible film electrode, wherein the specific steps are as follows:
s21, coating: placing continuous PET (polyethylene terephthalate) substrates on the conveyor belt, injecting the electrode slurry into the slurry hopper, and conveying the substrates loaded with the electrode slurry to the position right below the scraper by the conveyor belt for continuous coating; the coating thickness is 500 μm;
s22, drying: conveying the substrate coated in the step S21 into the drying oven through the conveyor belt at a conveying speed of 1m/min, and carrying out sectional type temperature control drying; the sectional type drying box comprises three sections, wherein the drying temperature of the first section is as follows: the wind speed of the first section is 1m/s at 30 ℃; the drying temperature of the second section is 75 ℃, and the wind speed of the second section is 2 m/s; the drying temperature of the third section is 110 ℃, and the wind speed of the third section is 3 m/s;
s23, peeling and rolling: and (4) enabling the substrate dried in the step (S22) to pass through the double-roller winding machine, peeling the dried and molded flexible film electrode from the substrate, and winding.
Referring to fig. 2, as to the cycle stability chart of the flexible thin film electrode prepared in example 1 of the present invention, the lithium cobaltate flexible thin film electrode has good cycle stability, is charged and discharged at a rate of 0.2C, has a specific capacity of 145 mAh/g, and has a better capacity retention rate.
Example 2
S1, preparing electrode slurry: weighing graphite, carbon nano tubes, carbon black, PU and PAN in a mass ratio of 28:4:2:3:3, adding the graphite, the carbon nano tubes, the carbon black, the PU and the PAN into DMF, performing ball milling dispersion treatment for 4 hours by a ball mill at a rotating speed of 250 revolutions per minute, and preparing into electrode slurry with a solid content of 200 mg/mL.
S2, injecting the electrode slurry into an integrated working platform, coating, drying, peeling and rolling to obtain the flexible film electrode, wherein the specific steps are as follows:
s21, coating: placing continuous PP (polypropylene) substrates on the conveyor belt, injecting the electrode slurry into the slurry hopper, and conveying the substrates loaded with the electrode slurry to the position right below the scraper by the conveyor belt for continuous coating; the coating thickness is 750 mu m;
s22, drying: conveying the substrate coated in the step S21 into the drying oven through the conveyor belt at a conveying speed of 1m/min, and carrying out sectional type temperature control drying; the drying temperature in the first stage was: the wind speed of the first section is 2m/s at 25 ℃; the drying temperature of the second section is 85 ℃, and the wind speed of the second section is 2 m/s; the drying temperature of the third section is 120 ℃, and the wind speed of the third section is 4 m/s;
s23, peeling and rolling: and (4) enabling the substrate dried in the step (S22) to pass through the double-roller winding machine, peeling the dried and molded flexible film electrode from the substrate, and winding.
Referring to fig. 3, a real object diagram of the flexible thin film electrode prepared in example 2 of the present invention shows that, as can be seen from fig. 3, the flexible thin film electrode prepared in example 2 of the present invention has good flexibility.
Example 3
S1, preparing electrode slurry: weighing graphite, carbon nano tubes, carbon black and PU in a mass ratio of 16:1:1:2, adding into THF, performing ball milling dispersion treatment for 3 hours by a ball mill at a rotating speed of 250 revolutions per minute, and preparing into electrode slurry with a solid content of 200 mg/mL.
S2, injecting the electrode slurry into an integrated working platform, coating, drying, peeling and rolling to obtain the flexible film electrode, wherein the specific steps are as follows:
s21, coating: placing continuous glass substrates on the conveyor belt, injecting the electrode slurry into the slurry hopper, and conveying the substrates loaded with the electrode slurry to the position right below the scraper by the conveyor belt for continuous coating; the coating thickness is 750 mu m;
s22, drying: conveying the substrate coated in the step S21 into the drying oven through the conveyor belt at a conveying speed of 15m/min, and carrying out sectional type temperature control drying; the sectional type drying box comprises three sections, wherein the drying temperature of the first section is as follows: the wind speed of the first section is 1m/s at 35 ℃; the drying temperature of the second section is 50 ℃, and the wind speed of the second section is 4 m/s; the drying temperature of the third section is 100 ℃, and the wind speed of the third section is 5 m/s;
s23, peeling and rolling: and (4) enabling the substrate dried in the step (S22) to pass through the double-roller winding machine, peeling the dried and molded flexible film electrode from the substrate, and winding.
Table 1 shows the mechanical property data of the flexible thin film electrode prepared in example 3
As can be seen from Table 1, the flexible thin film electrode prepared in the embodiment 3 of the invention has excellent mechanical properties, the elastic modulus reaches 447.86MPa, the elongation at break reaches 10.93%, and the stress at break reaches 7.39 MPa.
Referring to fig. 4, an SEM image of the flexible thin film electrode prepared in example 3 of the present invention shows that, as shown in fig. 4, graphite particles, carbon nanotubes and carbon black are tightly interlaced with each other through PU, which shows that a tight and firm structure is formed inside the flexible thin film electrode, so that the flexible thin film electrode prepared in this embodiment has excellent mechanical properties. As shown in fig. 5, the stress-strain curve of the flexible thin film electrode prepared in example 3 of the present invention further shows that the flexible thin film electrode has excellent mechanical properties, which is helpful for the compact internal structure shown in fig. 4.
Example 4
S1, preparing electrode slurry: weighing lithium iron phosphate, carbon fiber, graphene, PEDOT and PSS according to the mass ratio of 36:1:1:1:1, adding into THF, and performing dispersion treatment for 4 hours through a magnetic stirrer at the rotating speed of 1000 revolutions per minute to prepare electrode slurry with the solid content of 400 mg/mL.
S2, injecting the electrode slurry into an integrated working platform, coating, drying, peeling and rolling to obtain the flexible film electrode, wherein the specific steps are as follows:
s21, coating: placing continuous glass substrates on the conveyor belt, injecting the electrode slurry into the slurry hopper, and conveying the substrates loaded with the electrode slurry to the position right below the scraper by the conveyor belt for continuous coating; the coating thickness is 750 mu m;
s22, drying: conveying the substrate coated in the step S21 into the drying oven through the conveyor belt at a conveying speed of 5m/min, and carrying out sectional type temperature control drying; the sectional type drying box comprises three sections, wherein the drying temperature of the first section is as follows: the wind speed of the first section is 3m/s at 25 ℃; the drying temperature of the second section is 90 ℃, and the wind speed of the second section is 3 m/s; the drying temperature of the third section is 120 ℃, and the wind speed of the third section is 3 m/s.
S23, peeling and rolling: and (4) enabling the substrate dried in the step (S22) to pass through the double-roller winding machine, peeling the dried and molded flexible film electrode from the substrate, and winding.
Referring to fig. 6, a graph of the rate capability of the flexible thin film electrode prepared in example 4 of the present invention is shown. As can be seen from fig. 6, the lithium iron phosphate flexible thin film electrode prepared in example 4 of the present invention has an excellent capacity under the condition of 0.1C times.
Example 5
S1, preparing electrode slurry: weighing lithium titanate, acetylene black, graphene and PAN in a mass ratio of 14:1:1:4, adding the materials into NMP, and performing dispersion treatment for 6 hours by using a magnetic stirrer at a rotating speed of 500 revolutions per minute to prepare electrode slurry with a solid content of 400 mg/mL.
S2, injecting the electrode slurry into an integrated working platform, coating, drying, peeling and rolling to obtain the flexible film electrode, wherein the specific steps are as follows:
s21, coating: placing continuous glass substrates on the conveyor belt, injecting the electrode slurry into the slurry hopper, and conveying the substrates loaded with the electrode slurry to the position right below the scraper by the conveyor belt for continuous coating; the coating thickness is 750 mu m;
s22, drying: conveying the substrate coated in the step S21 into the drying oven through the conveyor belt at a conveying speed of 5m/min, and carrying out sectional type temperature control drying; the sectional type drying box comprises three sections, wherein the drying temperature of the first section is as follows: the wind speed of the first section is 2m/s at 30 ℃; the drying temperature of the second section is 75 ℃, and the wind speed of the second section is 4 m/s; the drying temperature of the third section is 125 ℃, and the wind speed of the third section is 2 m/s;
s23, peeling and rolling: and (4) enabling the substrate dried in the step (S22) to pass through the double-roller winding machine, peeling the dried and molded flexible film electrode from the substrate, and winding.
Referring to fig. 7, an SEM image of a flexible thin film electrode prepared in example 5 of the present invention is shown. As can be seen from fig. 7, the particles of the lithium titanate flexible thin-film electrode prepared in example 5 of the present invention are uniformly distributed, and no obvious agglomeration phenomenon occurs, which indicates that the flexible thin-film electrode prepared in this example has good electrochemical properties.
It should be noted that, as will be understood by those skilled in the art, the solid content in the process of preparing the electrode paste and the coating thickness of the continuous coating process can be adjusted according to actual needs, wherein the solid content of the electrode paste is 100-1000 mg/mL, and the coating thickness is 10-800 μm.
In summary, the invention provides a method for preparing a flexible thin film electrode on a large scale by using an integrated working platform, which comprises the steps of firstly weighing active substances, a conductive agent and a binder in a predetermined mass ratio, adding the active substances, the conductive agent and the binder into a predetermined solvent, and preparing electrode slurry with a predetermined solid content by ball milling or magnetic stirring; and then injecting the electrode slurry into an integrated working platform, and performing coating, segmented temperature control drying, peeling and rolling to realize large-scale continuous preparation of the flexible film electrode. The method provided by the invention realizes the large-scale preparation of the independent self-supporting flexible film electrode by using a coating method without a current collector, the preparation process is integrally completed, and the preparation method is simple. The flexible film electrode prepared by the invention has good flexibility, can be repeatedly folded, eliminates the inevitable powder dropping phenomenon caused by the traditional method for preparing the electrode by loading active substances on the current collector, has excellent electrochemical performance, has huge application prospect, and is suitable for large-scale industrial production.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for preparing a flexible film electrode on a large scale by using an integrated working platform is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing electrode slurry: weighing active substances, a conductive agent and a binder in a predetermined mass ratio, adding the active substances, the conductive agent and the binder into a predetermined solvent, and preparing electrode slurry with a predetermined solid content by ball milling or magnetic stirring;
and S2, injecting the electrode slurry into an integrated working platform, and sequentially carrying out coating, drying, peeling and rolling to obtain the flexible film electrode, thereby realizing large-scale continuous preparation of the flexible film electrode.
2. The method for large-scale preparation of the flexible thin film electrode by using the integrated working platform as claimed in claim 1, wherein the method comprises the following steps: the integrated working platform comprises a conveying belt (1) arranged along the horizontal direction, a slurry hopper (2) sequentially arranged above the conveying belt (1), a scraper (3) for coating and a drying box (6); the integrated working platform also comprises a double-roller winding machine (8) for continuously collecting the flexible film electrode; the drying box (6) is a sectional type drying box, and the temperature and the wind speed of each section are independently adjusted.
3. The method for large-scale preparation of the flexible thin film electrode by the integrated working platform according to claims 1-2, wherein the method comprises the following steps: the step S2 includes the following steps:
s21, coating: placing continuous substrates on the conveyor belt (1), injecting the electrode slurry into the slurry hopper (2), and conveying the substrates loaded with the electrode slurry by the conveyor belt (1) to be directly below the scraper (3) for continuous coating;
s22, drying: conveying the substrate coated in the step S21 into the sectional type drying box through the conveyor belt (1) at a conveying speed of 0.1-20 m/min, and performing sectional type temperature control drying; the sectional type drying box comprises three sections, wherein the drying temperature of the first section is as follows: the temperature is 0-35 ℃, and the air speed of the first section is 0-3 m/s; the drying temperature of the second section is 35-100 ℃, and the air speed of the second section is 2-4 m/s; the drying temperature of the third section is 80-130 ℃, and the air speed of the third section is 0-5 m/s;
s23, peeling and rolling: and (5) enabling the substrate dried in the step (S22) to pass through the double-roller winding machine (8), and peeling the dried and formed flexible film electrode from the substrate, and winding to realize continuous collection.
4. The method for large-scale preparation of the flexible thin film electrode by using the integrated working platform as claimed in claim 3, wherein the method comprises the following steps: in the coating process of step S21, the coating thickness is 10 to 800 μm.
5. The method for large-scale preparation of the flexible thin film electrode by using the integrated working platform as claimed in claim 1, wherein the method comprises the following steps: in step S1, the mass ratio of the active material to the conductive agent is 45: 1-5: 1; the mass ratio of the active substance to the binder is 7: 2-9: 0.5; the solid content of the electrode slurry is 100-1000 mg/mL.
6. The method for large-scale preparation of the flexible thin film electrode by using the integrated working platform as claimed in claim 1, wherein the method comprises the following steps: the active substance is one of lithium iron phosphate, ternary materials, lithium cobaltate, lithium titanate, graphite and silicon carbon.
7. The method for large-scale preparation of the flexible thin film electrode by using the integrated working platform as claimed in claim 1, wherein the method comprises the following steps: the conductive agent is one or a mixture of more of carbon nano tubes, graphene, carbon fibers, acetylene black, carbon black and Ketjen black.
8. The method for large-scale preparation of the flexible thin film electrode by using the integrated working platform as claimed in claim 1, wherein the method comprises the following steps: the binder is one or a mixture of PU, PAN, PEDOT and PSS.
9. The method for large-scale preparation of the flexible thin film electrode by using the integrated working platform as claimed in claim 1, wherein the method comprises the following steps: the solvent is one or a mixture of THF, NMP and DMF.
10. The method for large-scale preparation of the flexible thin film electrode by using the integrated working platform as claimed in claim 3, wherein the method comprises the following steps: the substrate is one of release paper, a PET substrate and a PP substrate.
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