CN109142149B - Method for detecting dispersion stability of slurry for battery - Google Patents
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- CN109142149B CN109142149B CN201811025989.6A CN201811025989A CN109142149B CN 109142149 B CN109142149 B CN 109142149B CN 201811025989 A CN201811025989 A CN 201811025989A CN 109142149 B CN109142149 B CN 109142149B
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- 239000002002 slurry Substances 0.000 title claims abstract description 217
- 239000006185 dispersion Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000012360 testing method Methods 0.000 claims abstract description 30
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical group [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 9
- 229910001416 lithium ion Inorganic materials 0.000 claims description 9
- 239000007787 solid Substances 0.000 description 33
- 238000004537 pulping Methods 0.000 description 10
- 239000006256 anode slurry Substances 0.000 description 9
- 239000002904 solvent Substances 0.000 description 9
- 238000005303 weighing Methods 0.000 description 9
- 239000011267 electrode slurry Substances 0.000 description 8
- 238000005259 measurement Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000002033 PVDF binder Substances 0.000 description 5
- 238000005119 centrifugation Methods 0.000 description 5
- 239000008367 deionised water Substances 0.000 description 5
- 229910021641 deionized water Inorganic materials 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 description 4
- FBDMTTNVIIVBKI-UHFFFAOYSA-N [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] Chemical compound [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] FBDMTTNVIIVBKI-UHFFFAOYSA-N 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000006257 cathode slurry Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000002427 irreversible effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
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- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a method for detecting dispersion stability of slurry for a battery, which comprises the following steps: step 1, placing slurry for batteries in a container; step 2, placing the container containing the slurry on a vibrating device for vibration; step 3, after vibration, respectively performing fineness test on the upper layer slurry and the lower layer slurry, and evaluating the dispersion stability of the slurry according to the fineness ratio of the upper layer slurry and the lower layer slurry, wherein when the fineness ratio of the upper layer slurry and the lower layer slurry is higher than 0.9, the dispersion stability of the slurry is better; when the fineness ratio of the upper layer pulp to the lower layer pulp is between 0.7 and 0.9, the dispersion stability of the pulp is good, and when the fineness ratio of the upper layer pulp to the lower layer pulp is lower than 0.7, the dispersion stability of the pulp is poor. The invention has short time and low cost; the vibration did not damage the slurry.
Description
Technical Field
The invention belongs to the field of batteries, and particularly relates to a method for detecting dispersion stability of slurry for batteries.
Background
The lithium ion battery has become a main energy source of communication electronic products due to the advantages of cleanness, environmental protection, high energy density, stable discharge voltage, good cycle performance and the like. In recent years, lithium ion batteries are considered to be one of the most promising new energy power forms, and scientists in various countries are constantly working on developing and researching more practical and effective lithium ion batteries. The slurry is an important factor for determining the performance of the lithium ion battery, and poor dispersion stability of the slurry can cause poor consistency and small reversible capacity of the battery and even possibly cause potential safety hazards, so that the test and evaluation of the stability of the slurry in the production process are very important for the performance of the lithium ion battery.
At present, a plurality of methods for evaluating the stability of the slurry exist, and the method proposed by patent CN102539294A is to stand the slurry in a separating funnel, and then measure the particle size difference of slurry particles at the upper layer and the lower layer in the separating funnel to evaluate the stability of the slurry, and the method takes a long time. Patent CN101382489A evaluates slurry stability by testing the difference of backscattering intensity of slurry on the upper layer and the lower layer after centrifugation, although the method is quick, the slurry needs to be centrifuged, then a laser scattering instrument is used for measuring the backscattering intensity, the flow is tedious, and the centrifugation can cause irrecoverable damage to the slurry.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for detecting the dispersion stability of slurry for a battery, which has the advantages of low cost, short time consumption and no damage to the slurry.
The invention is realized by the following technical scheme:
a method for detecting dispersion stability of slurry for a battery comprises the following steps:
step 1, placing slurry for batteries in a container;
step 2, placing the container containing the slurry on a vibrating device for vibration;
and 3, after vibration, respectively performing fineness test on the upper layer slurry and the lower layer slurry, and evaluating the dispersion stability of the slurry according to the fineness ratio of the upper layer slurry and the lower layer slurry.
Preferably, in step 1, the battery slurry is a lithium ion battery slurry, and the height of the container is 5cm or more and the volume is 5mL or more.
Preferably, in step 2, the vibrating device is a tap density meter or a tap platform.
Preferably, in the step 2, the vibration mode is up-and-down vibration, the vibration height is less than or equal to 50cm, the vibration frequency is 60-600 times/min, and the vibration time is 1-720 min.
Preferably, in step 3, a pipette, a syringe or a pipette is used to suck the slurry for the fineness test.
Preferably, in step 3, the upper layer of slurry is slurry within the range from the upper surface of the slurry to the height from the upper surface of the slurry being 1/3 the total height of the slurry, and the lower layer of slurry is slurry within the range from the bottom of the vessel to the height from the bottom of the vessel being 1/3 the total height of the slurry.
Preferably, in step 3, the fineness test is performed by using a blade fineness gauge.
Preferably, in the step 3, a parallel test method is adopted for more than three times during the fineness test, the pulp at the same height position is sucked in each parallel test, the used pulp amount is consistent, and the test value is the average value of the parallel test results of more than three times.
Preferably, the volume of the slurry used for the fineness test is 0.2-2 mL.
Preferably, in the step 3, evaluating the dispersion stability of the slurry according to the fineness ratio of the slurry on the upper layer and the slurry on the lower layer specifically comprises: when the fineness ratio of the upper layer slurry and the lower layer slurry is higher than 0.9, the dispersion stability of the slurry is relatively excellent; when the fineness ratio of the upper layer pulp to the lower layer pulp is between 0.7 and 0.9, the dispersion stability of the pulp is good, and when the fineness ratio of the upper layer pulp to the lower layer pulp is lower than 0.7, the dispersion stability of the pulp is poor.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention adopts a vibration method to process the battery slurry, measures the fineness of the upper layer slurry and the lower layer slurry after vibration, evaluates the stability of the slurry according to the fineness ratio of the upper layer slurry and the lower layer slurry, and has short time and low cost compared with a slurry dispersion stability detection method adopting centrifugation or long-time standing and the like. More importantly, the difference of the solid contents of the upper layer and the lower layer of the slurry is reduced after the slurry is vibrated, which indicates that the solid contents of the upper layer and the lower layer of the slurry are more uniform after the slurry is vibrated, so that the vibration does not damage the slurry, but improves the uniformity of the slurry. The traditional methods of centrifugation, long-time standing and the like test the dispersion stability of the slurry, which can cause the sedimentation of the slurry, thereby causing irreversible damage to the slurry.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The method for detecting the dispersion stability of the slurry for the battery comprises the following steps of:
(1) taking a proper amount of prepared slurry for the battery and placing the slurry in a container with certain height and volume;
(2) placing the container containing the slurry on vibrating equipment such as a tap density instrument or a tap table and the like, and vibrating for a period of time at a certain frequency;
(3) performing fineness test on the upper layer slurry and the lower layer slurry of the vibrated container, and when the fineness ratio of the upper layer slurry and the lower layer slurry is higher than 0.9, indicating that the dispersion stability of the slurry is better; when the fineness ratio of the upper layer pulp to the lower layer pulp is between 0.7 and 0.9, the dispersion stability of the pulp is good, and when the fineness ratio of the upper layer pulp to the lower layer pulp is lower than 0.7, the dispersion stability of the pulp is poor.
In the step (1), the slurry for the battery is the slurry for the lithium ion battery, the slurry for the lithium ion battery is the anode slurry or the cathode slurry, the height of the container is not less than 5cm, and the volume of the container is not less than 5 mL.
The vibration mode of the vibration equipment in the step (2) is up-and-down vibration, the vibration height is not more than 50cm, preferably the vibration height is 1-5cm, the vibration frequency is 60-600 times/min, and the vibration time is 1-720 min.
And (3) measuring the upper layer slurry and the lower layer slurry in the container in the step (3) by adopting a pipette, a syringe or a suction pipe, and the like, wherein when the slurry in the container is measured, the upper layer slurry is taken from the upper surface of the slurry to the position which is at the height of the total height 1/3 of the slurry from the upper surface of the slurry, and the lower layer slurry is taken from the bottom of the container to the position which is at the height of the total height 1/3 of the slurry from the bottom of the container.
The fineness test is carried out by adopting a scraper fineness meter, more than three times of parallel test methods are adopted during the fineness test, and the volume of slurry used in each test is 0.2-2 mL. And in the fineness test, the test value is the average value of more than three parallel test results, and the three parallel tests suck the slurry at the same height position and use the same amount of slurry.
Specific examples are as follows.
Example 1
Weighing lithium nickel cobalt manganese oxide, PVDF, SP and CNT according to the mass ratio of 96:2:1.5:0.5, using NMP as a solvent, designing the solid content to be 68%, pulping by using a stirring kettle according to the process requirements, putting 50mL of slurry-mixed anode slurry into a 50mL measuring cylinder, then putting the measuring cylinder filled with the anode slurry on a tap density instrument, vibrating for 30min at the frequency of 300 times/min, wherein the vibration height is 5cm, sucking 0.5mL of slurry at the position 1cm away from the surface of the slurry by using a suction pipe, measuring the fineness by using a scraper fineness gauge, repeating the sucking and measuring operations, and determining for three times to obtain an average value; then sucking 0.5mL of slurry at a position 1cm away from the bottom of the measuring cylinder by using a suction pipe, measuring the fineness by using a scraper fineness meter, repeating the sucking and measuring operations, continuously measuring for three times, calculating an average value, and calculating the fineness ratio of the upper-layer slurry to the lower-layer slurry. The solid content of the slurry at a distance of 1cm from the surface of the slurry and the solid content of the slurry at a distance of 1cm from the bottom of the measuring cylinder were measured, and the average value was obtained by three measurements.
Example 2
Weighing lithium nickel cobalt manganese oxide, PVDF, SP and CNT according to the mass ratio of 95:3:1.5:0.5, using NMP as a solvent, designing the solid content to be 68%, pulping by using a stirring kettle according to the process requirements, putting 50mL of slurry-mixed anode slurry into a 50mL measuring cylinder, then putting the measuring cylinder filled with the anode slurry on a tap density instrument, vibrating for 30min at the frequency of 300 times/min, wherein the vibration height is 1cm, sucking 0.2mL of slurry at the position 5cm away from the surface of the slurry by using a liquid transfer gun, measuring the fineness by using a scraper fineness gauge, repeating the sucking and measuring operations, and determining for three times to obtain an average value; then sucking 0.2mL of slurry at a position 5cm away from the bottom of the measuring cylinder by using a suction pipe, measuring the fineness by using a scraper fineness meter, repeating the sucking and measuring operations, continuously measuring for three times, calculating an average value, and calculating the fineness ratio of the upper-layer slurry to the lower-layer slurry. The solid content of the slurry at a distance of 1cm from the surface of the slurry and the solid content of the slurry at a distance of 1cm from the bottom of the measuring cylinder were measured, and the average value was obtained by three measurements.
Example 3
Weighing lithium nickel cobalt manganese oxide, PVDF, SP and CNT according to the mass ratio of 97:1:1.5:0.5, using NMP as a solvent, designing the solid content to be 68%, pulping by using a stirring kettle according to the process requirements, putting 50mL of slurry-mixed anode slurry into a 50mL measuring cylinder, then putting the measuring cylinder filled with the anode slurry on a tap density instrument, vibrating for 30min at the frequency of 300 times/min, wherein the vibration height is 5cm, sucking 0.8mL of slurry at the position 8cm away from the surface of the slurry by using a pipette, measuring the fineness by using a scraper fineness meter, repeating the sucking and measuring operations, and determining the average value for three times; then sucking 0.8mL of slurry at a position 8cm away from the bottom of the measuring cylinder by using a suction pipe, measuring the fineness by using a scraper fineness meter, repeating the sucking and measuring operations, measuring for three times in total, calculating an average value, and calculating the fineness ratio of the upper-layer slurry to the lower-layer slurry. The solid content of the slurry at a distance of 1cm from the surface of the slurry and the solid content of the slurry at a distance of 1cm from the bottom of the measuring cylinder were measured, and the average value was obtained by three measurements.
Example 4
Weighing a graphite negative electrode, CMC, SBR and SP according to the mass ratio of 95.8:1.4:1.8:1, using deionized water as a solvent, wherein the designed solid content is 45%, pulping by using a stirred tank according to the process requirements, putting 50mL of the mixed negative electrode slurry into a 50mL measuring cylinder, then putting the measuring cylinder filled with the negative electrode slurry on a tap density instrument, vibrating for 30min at the frequency of 300 times/min, wherein the vibration height is 5cm, sucking 1mL of the slurry at the position 10cm away from the surface of the slurry by using an injector, measuring the fineness by using a scraper fineness gauge, repeating the sucking and measuring operations, determining the average value for three times, sucking 1mL of the slurry at the position 10cm away from the bottom of the measuring cylinder by using a sucking pipe, measuring the fineness by using the scraper fineness, repeating the sucking and measuring operations, determining the average value for three times, and calculating the fineness ratio of the upper layer slurry and the lower layer slurry. The solid content of the slurry at a distance of 1cm from the surface of the slurry and the solid content of the slurry at a distance of 1cm from the bottom of the measuring cylinder were measured, and the average value was obtained by three measurements.
Example 5
Weighing a graphite negative electrode, CMC, SBR and SP according to a mass ratio of 94.5:2:2.5:1, using deionized water as a solvent, wherein the designed solid content is 45%, pulping by using a stirred tank according to the process requirements, putting 50mL of the mixed negative electrode slurry into a 50mL measuring cylinder, then putting the measuring cylinder filled with the negative electrode slurry on a tap density instrument, vibrating for 30min at a frequency of 300 times/min, wherein the vibration height is 10cm, sucking 1.5mL of the slurry at a position 14cm away from the surface of the slurry by using a suction pipe, measuring the fineness by using a scraper fineness gauge, repeating the sucking and measuring operations, determining the average value for three times, sucking 1.5mL of the slurry at a position 14cm away from the bottom of the measuring cylinder by using the suction pipe, measuring the fineness by using the scraper fineness gauge, repeating the sucking and measuring operations, determining the average value for three times, and calculating the fineness ratio of the upper layer slurry and the lower layer slurry. The solid content of the slurry at a distance of 1cm from the surface of the slurry and the solid content of the slurry at a distance of 1cm from the bottom of the measuring cylinder were measured, and the average value was obtained by three measurements.
Example 6
Weighing a graphite negative electrode, CMC, SBR and SP according to a mass ratio of 97:1:1:1, using deionized water as a solvent, designing a solid content to be 45%, pulping by using a stirred tank according to process requirements, loading 50mL of the cathode slurry after being mixed into a 50mL measuring cylinder, then placing the measuring cylinder filled with the cathode slurry on a tap density instrument, vibrating for 30min at a frequency of 300 times/min, wherein the vibration height is 20cm, sucking 2mL of the slurry at a position 12cm away from the surface of the slurry by using a suction pipe, measuring the fineness by using a scraper fineness gauge, repeating the sucking and measuring operations, measuring the average value for three times, sucking 2mL of the slurry at a position 12cm away from the bottom of the measuring cylinder by using the suction pipe, measuring the fineness by using the scraper fineness gauge, repeating the sucking and measuring operations, measuring the average value for three times, and calculating the fineness ratio of the upper layer slurry and the lower layer slurry. The solid content of the slurry at a distance of 1cm from the surface of the slurry and the solid content of the slurry at a distance of 1cm from the bottom of the measuring cylinder were measured, and the average value was obtained by three measurements.
Example 7
Weighing lithium nickel cobalt manganese oxide, PVDF, SP, CNT and NMP as solvents according to a mass ratio of 96:2:1.5:0.5, wherein the designed solid content is 68%, pulping by adopting a stirred tank according to the process requirements, putting 100mL of slurry-mixed anode slurry into a 100mL beaker, then putting the beaker filled with the anode slurry on a tap density instrument, vibrating for 1min at a frequency of 600 times/min, wherein the vibration height is 50cm, sucking 0.5mL of slurry at a position 20cm away from the surface of the slurry by using a suction pipe, measuring the fineness by using a scraper fineness gauge, repeating the sucking and measuring operations, determining the average value for three times, sucking 0.5mL of slurry at a position 20cm away from the bottom of the beaker by using the suction pipe, measuring the fineness by using the scraper fineness gauge, repeating the sucking and measuring operations, determining the average value for three times, and calculating the fineness ratio of the upper slurry to the lower slurry. The solid content of the slurry at a distance of 1cm from the surface of the slurry and the solid content of the slurry at a distance of 1cm from the bottom of the beaker were measured and averaged three times.
Example 8
Weighing a graphite negative electrode, CMC, SBR and SP according to the mass ratio of 95.8:1.4:1.8:1, using deionized water as a solvent, wherein the designed solid content is 45%, pulping by using a stirred tank according to the process requirements, putting 25mL of the negative electrode slurry after being mixed into a 25mL measuring cylinder, then putting the measuring cylinder filled with the negative electrode slurry on a vibrating table, vibrating for 720min at the frequency of 60 times/min, wherein the vibration height is 5cm, sucking 0.5mL of slurry at the position 5cm away from the surface of the slurry by using a suction pipe, measuring the fineness by using a scraper fineness gauge, repeating the sucking and measuring operations, determining the average value for three times, sucking 0.5mL of slurry at the position 5cm away from the bottom of the measuring cylinder by using the suction pipe, measuring the fineness by using the scraper fineness gauge, repeating the sucking and measuring operations, determining the average value for three times, and calculating the fineness ratio of the upper layer slurry and the lower layer slurry. The solid content of the slurry at a distance of 1cm from the surface of the slurry and the solid content of the slurry at a distance of 1cm from the bottom of the measuring cylinder were measured, and the average value was obtained by three measurements.
Example 9
Weighing a graphite negative electrode, CMC, SBR and SP according to the mass ratio of 95.8:1.4:1.8:1, using deionized water as a solvent, wherein the designed solid content is 45%, pulping by using a stirred tank according to the process requirements, putting 5mL of the mixed negative electrode slurry into a 5mL measuring cylinder, then putting the measuring cylinder filled with the negative electrode slurry on a vibrating table, vibrating for 500min at the frequency of 100 times/min, wherein the vibration height is 3cm, sucking 0.2mL of slurry at the position 1cm away from the surface of the slurry by using a suction pipe, measuring the fineness by using a scraper fineness gauge, repeating the sucking and measuring operations, determining the average value for three times, sucking 0.2mL of slurry at the position 1cm away from the bottom of the measuring cylinder by using the suction pipe, measuring the fineness by using the scraper fineness gauge, repeating the sucking and measuring operations, determining the average value for three times, and calculating the fineness ratio of the upper layer slurry and the lower layer slurry. The solid content of the slurry at a distance of 1cm from the surface of the slurry and the solid content of the slurry at a distance of 1cm from the bottom of the measuring cylinder were measured, and the average value was obtained by three measurements.
Table 1 shows the fineness numbers and fineness ratios of the upper and lower layer slurries after the slurries of examples 1 to 6 were vibrated. Examples 1 to 3 are positive electrode pastes, and it can be seen from the data in the table that the pastes of examples 1 to 3 are good in dispersibility, superior and inferior, respectively. From the description of examples 1 to 3, it can be seen that the mass percentages of the PVDF binder in the total amount are, from high to low: example 2 > example 1 > example 3, and there is a direct relationship between the dispersibility of the slurry and the quality. Similarly, the data in the table show that the dispersibility of the slurries of examples 4 to 6 is good, good and poor, respectively, and is directly related to the amounts of the dispersant CMC and the binder SBR used in examples 4 to 6. While the use of more dispersant and binder aids in the dispersion of the slurry, the use of too much results in an increase in the resistivity of the pole piece, thereby reducing the performance and energy density of the battery. Thus the amount of binder and dispersant that is suitable should be as low as possible while maintaining good dispersion of the slurry. The method is beneficial to quickly screening out the appropriate using amount of the binder and the dispersant, and is also beneficial to quickly screening and optimizing the pulping process.
Table 2 shows the solid content values of the slurries of the upper and lower layers before and after the slurries of examples 1 to 6 were vibrated. As can be seen from the data in the table, the difference between the solid contents of the upper layer and the lower layer is reduced after the slurry is vibrated, which indicates that the solid contents of the upper layer and the lower layer of the slurry are more uniform after the slurry is vibrated. The traditional methods of centrifugation, long-time standing and the like test the dispersion stability of the slurry, which can cause the sedimentation of the slurry, thereby causing irreversible damage to the slurry.
TABLE 1 fineness number and fineness ratio of upper and lower layer slurries after vibration of the slurries of examples 1-6
Table 2 solid content values of slurries of upper and lower layers before and after shaking of slurries of examples 1 to 6
Claims (6)
1. A method for detecting dispersion stability of slurry for a battery is characterized by comprising the following steps:
step 1, placing slurry for batteries in a container;
step 2, placing the container containing the slurry on a vibrating device for vibration; the vibration mode is up-down vibration;
step 3, after vibration, respectively performing fineness test on the upper layer slurry and the lower layer slurry, and evaluating the dispersion stability of the slurry according to the fineness ratio of the upper layer slurry and the lower layer slurry;
in the step 2, the vibration equipment is a tap density meter or a tap platform;
in the step 2, the vibration height is less than or equal to 50cm, the vibration frequency is 60-600 times/min, and the vibration time is 1-720 min;
in the step 3, the upper layer of slurry is the slurry within the range from the upper surface of the slurry to the position which is spaced from the upper surface of the slurry and has the height of the total height 1/3 of the slurry, and the lower layer of slurry is the slurry within the range from the bottom of the container to the position which is spaced from the bottom of the container and has the height of the total height 1/3 of the slurry;
in the step 3, evaluating the dispersion stability of the slurry according to the fineness ratio of the upper layer slurry and the lower layer slurry specifically comprises the following steps: when the fineness ratio of the upper layer slurry and the lower layer slurry is higher than 0.9, the dispersion stability of the slurry is relatively excellent; when the fineness ratio of the upper layer pulp to the lower layer pulp is between 0.7 and 0.9, the dispersion stability of the pulp is good, and when the fineness ratio of the upper layer pulp to the lower layer pulp is lower than 0.7, the dispersion stability of the pulp is poor.
2. The method for detecting dispersion stability of battery slurry according to claim 1, wherein in step 1, the battery slurry is lithium ion battery slurry, the height of the container is 5cm or more, and the volume is 5mL or more.
3. The method for detecting dispersion stability of slurry for batteries according to claim 1, wherein in step 3, slurry is sucked up using a pipette, a syringe or a pipette to perform fineness test.
4. The method for detecting dispersion stability of slurry for batteries according to claim 1, wherein in step 3, the fineness test is performed using a blade fineness gauge.
5. The method for detecting dispersion stability of slurry for batteries according to claim 1, wherein in the step 3, a method of parallel testing is adopted for fineness testing for more than three times, slurry at the same height position is sucked in each parallel test, the used slurry amount is consistent, and the test value is the average value of the results of the parallel tests for more than three times.
6. The method for detecting dispersion stability of slurry for batteries according to claim 1, wherein the volume of slurry used for fineness test is 0.2-2 mL.
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| CN109752293A (en) * | 2019-01-24 | 2019-05-14 | 合肥国轩高科动力能源有限公司 | Device for detecting stability of lithium ion battery slurry |
| CN111624136A (en) * | 2020-06-18 | 2020-09-04 | 合肥国轩高科动力能源有限公司 | Method for detecting stability and viscosity of battery slurry |
| CN114235902A (en) * | 2021-11-15 | 2022-03-25 | 湖北亿纬动力有限公司 | Method for testing dispersion stability of carbon black |
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