CN113555521A - Method for rapidly detecting processing performance of lithium ion battery negative electrode slurry - Google Patents
Method for rapidly detecting processing performance of lithium ion battery negative electrode slurry Download PDFInfo
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- CN113555521A CN113555521A CN202110763141.9A CN202110763141A CN113555521A CN 113555521 A CN113555521 A CN 113555521A CN 202110763141 A CN202110763141 A CN 202110763141A CN 113555521 A CN113555521 A CN 113555521A
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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
- H01M4/04—Processes of manufacture in general
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- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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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
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- 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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Abstract
The invention discloses a method for rapidly detecting the processing performance of lithium ion battery cathode slurry, which comprises the following steps: placing the prepared lithium ion battery negative electrode slurry in a slurry filling area, and obliquely placing a copper foil below the slurry filling area; enabling the lithium ion battery negative electrode slurry to freely flow downwards and coating the slurry on the surface of a copper foil; drying the copper foil to obtain a pole piece; and measuring the surface density and thickness of the pole piece, and judging the leveling performance and the sagging performance of the slurry. The invention can detect the leveling performance and the sagging performance of the slurry, and has high detection precision and simple method.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery manufacturing, and particularly relates to a method for rapidly detecting the processing performance of lithium ion battery cathode slurry.
Background
At present, the lithium ion battery is widely applied to various fields such as 3C digital, electric vehicles, energy storage and the like due to the advantages of high energy density, good cycle performance, high safety performance and the like. With the increasing market demand, the research and development period of lithium ion battery items is shorter and shorter, and a material system needs to be rapidly screened, and a rapid detection method for the performance of the electrode plate needs to be developed.
The quality of the battery depends on materials, the performance of the materials is shown by the pole pieces, the processing performance of the pole pieces is excellent, and the uniformity of the interior of the pole pieces can be ensured, so that the uniformity of the current density, the uniformity of the electrochemical reaction rate, the uniformity of the thickness of an SEI film, the concentration of electrolyte and the like of the battery are ensured, the polarization is reduced, and the service life of the battery is prolonged.
The sizing agent has the leveling property and the sagging property, the leveling property means that the sizing agent can be automatically leveled on the surface of the copper foil, the lower the general viscosity is, the better the fluidity is, the slower the structure recovery is, the better the leveling property is, the phenomena of orange peel, pits and the like on the surface after coating can be reduced, and the sagging property means that the sizing agent can keep a certain thickness when being coated. These two properties are contradictory, but the slurry needs to achieve a balance between the two.
The processing performance of the cathode slurry is mainly characterized by rheological properties (leveling property, sagging property, viscosity and other properties) of the slurry, a rheometer and a viscometer are required, the viscosity change of a three-stage thixotropy test is generally used for characterization, and the sagging property can be also characterized by a sagging tester, a sagging applicator is used for hanging and coating, the anode slurry is vertically placed, the upper part is kept thin and the lower part is kept thick, and the anode slurry does not flow into a strip film with the next thickness, namely the anode slurry does not sag.
In the prior art, a patent with application number 201210035187.X discloses a method for detecting the leveling property of battery paste, wherein the flow distance of electrode paste with a set volume under a set inclined path and a set time is measured, and the leveling property of the paste is detected according to the flow distance, wherein the longer the flow distance is, the better the leveling property is. The technical scheme has the defects that the error is large, the flowing distance is obtained by visually observing scale marks, fluctuation exists, and the scheme can only measure the leveling property and cannot measure the sagging property.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for rapidly detecting the processing performance of the lithium ion battery cathode slurry, which can detect the leveling property and the sagging property of the slurry and has high measurement precision.
In order to solve the technical problem, the invention provides a method for rapidly detecting the processing performance of lithium ion battery cathode slurry, which comprises the following steps:
placing the prepared lithium ion battery negative electrode slurry in a slurry filling area, and obliquely placing a copper foil below the slurry filling area;
enabling the lithium ion battery negative electrode slurry to freely flow downwards and coating the slurry on the surface of a copper foil;
drying the copper foil to obtain a pole piece;
measuring the surface density of the pole piece, and judging the leveling performance of the slurry according to the surface density;
and measuring the thickness of the pole piece, and judging the sagging performance of the slurry according to the thickness.
Optionally, the method further comprises:
and measuring the warping height of the edge position of the pole piece, and judging the cracking performance of the pole piece according to the warping height.
Optionally, the method further comprises:
and (3) after the prepared lithium ion battery cathode slurry is continuously placed for a period of time, repeating all the processes, measuring to obtain new surface density, and judging the storage performance of the slurry by comparing the surface density with the surface density.
Optionally, the prepared lithium ion battery negative electrode slurry is placed for 2h-8h before detection.
Optionally, the copper foil is fixed on a glass plate.
Optionally, a groove is formed in the glass plate, and the copper foil is fixed in the groove.
Optionally, the copper foil drying process includes:
and (3) putting the copper foil into a blast oven for drying at the temperature of 80-110 ℃ for 5-20 min.
Optionally, the process of measuring the areal density of the pole piece is as follows:
cutting 3 wafers along the set positions of the surface of the pole piece, and measuring the areal densities of the wafers as b1, b2 and b3 respectively;
the average of the areal densities of the 3 wafers was taken as the areal density of the pole piece.
Optionally, the set position refers to a position along the surface of the pole piece with a length of 10cm ± 5cm from the highest point.
Optionally, the measurement position of the warpage height is a position 1-3 cm away from the edge of the pole piece.
Compared with the prior art, the invention has the following beneficial effects: the method has the advantages that the testing method is simple, the quality of the slurry processing performance can be easily judged and compared, the leveling property, the sagging property and the cracking performance can be quickly judged, the testing accuracy is high, and the time and the materials are saved.
Drawings
FIG. 1 is a top view of a detection apparatus provided in an embodiment of the present invention;
fig. 2 is a side view of a detection apparatus provided in an embodiment of the present invention.
Reference numerals: 1. baffle, 2, recess, 3, clip, 4, glass board.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The invention discloses a method for rapidly detecting the processing performance of lithium ion battery negative electrode slurry, which is characterized in that the leveling property and the sagging property of the slurry are represented by the difference of the surface density and the thickness of the slurry coated on a copper foil through the same path and the same acting force, and the drying state (cracking condition) of the slurry at the current set temperature and wind speed can be represented by measuring the warping height of a pole piece, so that the cracking performance of the pole piece is expected.
The invention relates to a method for rapidly detecting the processing performance of lithium ion battery cathode slurry, wherein the processing performance comprises leveling property, sagging property and pole piece cracking property, the specific process of each performance detection is shown in figure 1, and the specific process comprises the following steps:
s1, preparing lithium ion battery cathode slurry according to a specified proportion; standing for 2-8 h;
s2, pasting a copper foil in a groove of a glass plate 4, sucking negative electrode slurry by a dropper, filling the negative electrode slurry in a slurry filling area surrounded by baffles, obliquely placing the whole detection device, quickly loosening the baffle at the top end, enabling the negative electrode slurry to freely fall down to flow into the groove of the glass plate, and flowing down along the surface of the copper foil along with gravity until the slurry is leveled, so that the negative electrode slurry is coated on the surface of the copper foil;
the concrete structure of the detection device is shown in fig. 1 and fig. 2, and comprises a glass plate 4, a slurry filling area enclosed by a baffle 1 is arranged above the glass plate 4, a cross-shaped groove 2 is arranged on the glass plate 4, a copper foil is arranged in the groove 2, during detection, the copper foil is cut into a shape corresponding to the groove and is attached to the groove 2, the depth of the groove 2 is 15 micrometers, and in order to fix the copper foil in the groove 2, the upper end and the lower end of the copper foil are fixed by a clamp 3.
The copper foil is a foil with double-sided light and the thickness of 6-12 μm.
S3, placing the detection device into a blast oven with set temperature, time and wind speed for drying, and taking out the detection device after the negative electrode slurry on the surface of the copper foil is dried to obtain a pole piece;
the set temperature is 80-110 ℃, the time is 5-20min, the drying oven is started to blow air to ensure uniform thermal convection of the temperature, and the device is required to be placed at a fixed position in the drying oven.
And S4, because the surface tension of the pole piece is different after being heated, the edge of the copper foil which is not restrained can be separated from the glass plate and is tilted to a certain height. Testing the warping height at a position (marked as a position a) which is 1-3 cm away from the upper edge of the pole piece, and detecting the cracking performance of the pole piece by comparing the warping heights;
highly reflect the warping degree of the pole piece after being heated, the higher the height is, the higher the warping degree is, the pole piece with high warping degree is easy to crack and orange peel wrinkle under the action of tensile force of a tensile machine. Thus the lower the height the better for the pole piece performance.
In normal production, the cracking position of the pole piece is basically within 3cm of the edge, so that the warping height of the pole piece at the position of 3cm of the edge is selected to indicate whether the pole piece is easy to crack or not, namely the cracking performance of the pole piece.
The height was measured with an end point ruler with a minimum accuracy of 1mm, and the distance of the tip of the warpage farthest from the copper foil (copper foil) was recorded as the height h of the warpage.
S5, taking down the pole piece, cutting 3 wafers along the position of the surface of the pole piece, which is 10cm +/-5 cm away from the highest point, testing the areal densities b1, b2 and b3, and taking the average value as b 4. And judging the leveling performance of the slurry according to the surface density value. The areal density is the mass per unit area, and a smaller areal density indicates a better leveling property of the slurry.
S6, testing the thicknesses of the three round slices by using a height gauge, wherein the thicknesses are respectively H1, H2 and H3, and calculating the range difference HR，HRA smaller value indicates better sagging properties of the slurry.
S6, after the slurry is placed for a period of time, repeating the tests from S2 to S5, and testing to obtain the areal density of b 5.
The time for the slurry to rest was 12 h. The smaller the difference between b5 and b4, the better the storage performance of the slurry.
The slurry with poor storage performance can generate the phenomena of sedimentation, viscosity increase or layering and the like within a short time, and is directly expressed on the difference of leveling property.
The invention has the advantages of simple test method, easy judgment and comparison of the processing performance of the slurry, rapid judgment of the cracking and leveling performance of the pole piece, high test accuracy and time and material saving.
Example 2
A method for rapidly detecting the processing performance of lithium ion battery cathode slurry comprises the following steps:
s1, preparing cathode slurry according to a specified proportion, and standing for 2 hours;
s2, pasting a copper foil with the thickness of 6 microns on equipment, sucking slurry by using a dropper to fill a slurry filling area, and loosening a baffle plate at the top end of the copper foil to naturally level the slurry along with gravity;
s3, placing the device into a blast oven with the temperature of 85 ℃ for 10min, and taking out the device after the slurry is dried;
s4, measuring the curling height of the edge pole piece at the testing position a by using an end point ruler with the minimum precision of 1mm, and comparing the processing performance of the slurry by comparing the warping height;
s5, the copper foil is taken down, 3 round pieces phi 12 mm are cut from a position 10cm away from the top end, the surface densities are measured to be b1, b2 and b3, and the average value is b 4. And comparing the difference of the surface densities to judge the leveling performance of the slurry.
S6, after the slurry is placed for a period of time, testing S2-S5 repeatedly, wherein the obtained area density is b 5. The storage property of the slurry is judged by comparison with b4 in step S5.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for rapidly detecting the processing performance of lithium ion battery cathode slurry is characterized by comprising the following steps:
placing the prepared lithium ion battery negative electrode slurry in a slurry filling area, and obliquely placing a copper foil below the slurry filling area;
enabling the lithium ion battery negative electrode slurry to freely flow downwards and coating the slurry on the surface of a copper foil;
drying the copper foil to obtain a pole piece;
measuring the surface density of the pole piece, and judging the leveling performance of the slurry according to the surface density;
and measuring the thickness of the pole piece, and judging the sagging performance of the slurry according to the thickness.
2. The method for rapidly detecting the processability of the lithium ion battery negative electrode slurry according to claim 1, further comprising the following steps:
and measuring the warping height of the edge position of the pole piece, and judging the cracking performance of the pole piece according to the warping height.
3. The method for rapidly detecting the processability of the lithium ion battery negative electrode slurry according to claim 1 or 2, further comprising the following steps:
and (3) after the prepared lithium ion battery cathode slurry is continuously placed for a period of time, repeating all the processes, measuring to obtain new surface density, and judging the storage performance of the slurry by comparing the surface density with the surface density.
4. The method for rapidly detecting the processability of the lithium ion battery negative electrode slurry according to claim 1, wherein the prepared lithium ion battery negative electrode slurry is placed for 2-8 h before detection.
5. The method for rapidly detecting the processability of the lithium ion battery negative electrode slurry according to claim 1, wherein the copper foil is fixed on a glass plate.
6. The method for rapidly detecting the processability of the lithium ion battery negative electrode slurry according to claim 5, wherein a groove is formed in the glass plate, and the copper foil is fixed in the groove.
7. The method for rapidly detecting the processability of the lithium ion battery negative electrode slurry according to claim 1, wherein the drying process of the copper foil is as follows:
and (3) putting the copper foil into a blast oven for drying at the temperature of 80-110 ℃ for 5-20 min.
8. The method for rapidly detecting the processing performance of the lithium ion battery negative electrode slurry according to claim 1, wherein the process of measuring the surface density of the pole piece is as follows:
cutting 3 wafers along the set positions of the surface of the pole piece, and measuring the areal densities of the wafers as b1, b2 and b3 respectively;
the average of the areal densities of the 3 wafers was taken as the areal density of the pole piece.
9. The method for rapidly detecting the processability of the lithium ion battery negative electrode slurry according to claim 8, wherein the set position is a position which is 10cm +/-5 cm away from the highest point along the surface of the pole piece.
10. The method for rapidly detecting the processing performance of the lithium ion battery negative electrode slurry according to claim 2, wherein the measurement position of the warping height is 1-3 cm away from the edge of the pole piece.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323138A (en) * | 2021-12-29 | 2022-04-12 | 江苏天鹏电源有限公司 | Method for rapidly evaluating dynamic performance of negative electrode binder for lithium ion battery |
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