CN115869810A - Slurry stirring device, electrode slurry, and preparation method and application thereof - Google Patents
Slurry stirring device, electrode slurry, and preparation method and application thereof Download PDFInfo
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- CN115869810A CN115869810A CN202211731800.1A CN202211731800A CN115869810A CN 115869810 A CN115869810 A CN 115869810A CN 202211731800 A CN202211731800 A CN 202211731800A CN 115869810 A CN115869810 A CN 115869810A
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- 238000003756 stirring Methods 0.000 title claims abstract description 239
- 239000002002 slurry Substances 0.000 title claims abstract description 87
- 239000011267 electrode slurry Substances 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 47
- 239000006185 dispersion Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims description 38
- 230000005540 biological transmission Effects 0.000 claims description 27
- 239000007787 solid Substances 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 16
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 7
- 229910001416 lithium ion Inorganic materials 0.000 claims description 7
- 238000004898 kneading Methods 0.000 abstract description 29
- 238000010790 dilution Methods 0.000 abstract description 2
- 239000012895 dilution Substances 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 23
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 21
- 238000007865 diluting Methods 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 239000000203 mixture Substances 0.000 description 9
- 239000002033 PVDF binder Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 7
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 7
- 239000002003 electrode paste Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 230000001174 ascending effect Effects 0.000 description 5
- 239000006258 conductive agent Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000013543 active substance Substances 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006182 cathode active material Substances 0.000 description 1
- 239000006257 cathode slurry Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003113 dilution method Methods 0.000 description 1
- 239000011883 electrode binding agent Substances 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Battery Electrode And Active Subsutance (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
The invention provides a slurry stirring device, electrode slurry, a preparation method and application thereof, wherein the slurry stirring device comprises a stirring container, a planetary stirring paddle is arranged in the stirring container, a disperser is integrated in the planetary stirring paddle, the slurry stirring device also comprises a lifting controller connected with the disperser, and a driver connected with the disperser and the planetary stirring paddle; the lifting controller is used for controlling the disperser to lift along the axial direction of the planetary stirring paddle, and the driver is used for controlling the disperser and the planetary stirring paddle to rotate. According to the slurry stirring device provided by the invention, the freely lifting disperser is integrated in the planetary stirring paddle, so that compared with the existing double planetary or planetary dispersing equipment, dead angles in the kneading process of the equipment can be effectively reduced, and the kneading efficiency and the overall dispersion uniformity of the final slurry are improved; compared with the existing three-planetary equipment, the kneading dilution capacity is obviously improved, and the preparation time of the slurry is shortened.
Description
Technical Field
The invention belongs to the technical field of batteries, relates to a slurry stirring device, and particularly relates to a slurry stirring device, electrode slurry, and a preparation method and application thereof.
Background
The planetary power mixer is a high-efficiency mixing device, and is suitable for liquid-liquid mixing, liquid-solid mixing, dispersing, homogenizing, emulsifying and other processes of lithium ion battery electrode slurry, adhesive, printing ink, pigment, cosmetics and the like. Planetary power mixers in the prior art generally adopt planetary gear transmission and are provided with low-speed stirring components or high-speed dispersing components. The low-speed stirring part adopts planetary gear transmission, and the stirring paddle also rotates during revolution, so that the materials can achieve an ideal mixing effect in a short time; the high-speed dispersion component and the planet carrier revolve together, and simultaneously rotate at high speed, so that the materials are mixed through strong shearing and dispersion. Planetary power mixers in the lithium ion battery industry are generally divided into the following parts according to the number of low-speed stirring components of the mixer and whether high-speed dispersing components are included: double planetary, triple planetary or planetary decentralized. In the existing lithium ion battery dry-type slurry manufacturing process, a dry mixing-kneading-diluting mode that a mixture of active substances, a conductive agent and a binder which are composed of different particle sizes is firstly and commonly adopted, then certain liquid is added for kneading, and finally the mixed slurry is regulated to be slurry with proper solid content by adding the residual required liquid is adopted, in the kneading process of double planetary and planetary distributed equipment, a dead angle is formed between the running track of a stirring paddle and a stirring tank, the slurry in the dead angle is difficult to be sufficiently kneaded and mixed, and meanwhile, in the kneading process, the slurry is generally in a clay state, a dispersing shaft of a planetary distributed stirrer cannot disperse the slurry, and the slurry in the stirring tank is hindered to flow due to the existence of the dispersing shaft, so that the kneading capacity of the stirring equipment is further deteriorated, and the working time of the equipment is prolonged; although the three-star stirrer effectively reduces dead angles in the kneading process by increasing the number of the stirring paddles, the three-star stirrer does not need a dispersing shaft, so that the kneaded clay-like slurry is difficult to quickly and efficiently dilute in the diluting process after kneading, and the working time of equipment is prolonged.
CN101785978a discloses a method for producing a slurry, in which slurry production can be efficiently performed in a short time with a small power by providing three or more stirring blades that perform planetary motion in a stirring tank (stirring tank) with opposite rotation directions of revolution and rotation, and a large cooling system is not required. However, although the method eliminates the dead zone phenomenon caused by using two stirring blades with the same revolution direction and rotation direction in the traditional stirrer by arranging more than three stirring blades with the opposite revolution direction and rotation direction in the stirring tank, thereby achieving the purposes of reducing the dosage of the kneaded liquid and shortening the dispersion time, the method only uses the stirring blades to knead and prepare the slurry in the subsequent dispersion process step, and for the mixture with larger physical property difference or easy agglomeration, the overall efficiency is lower in the dilution process, the dilution time of the equipment needs to be prolonged, and the whole slurry preparation process cannot be effectively shortened.
The currently disclosed slurry stirring devices have certain defects, dead angles are formed between the running track of the stirring paddle and the stirring tank, slurry in the dead angles is difficult to be fully kneaded and mixed, and the slurry is in a clay state in the kneading process of preparing battery slurry by adopting the slurry stirring devices, so that the dispersion of the slurry is difficult to realize, and the slurry preparation efficiency is low.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a slurry stirring device, electrode slurry, a preparation method and application thereof, and the slurry stirring device provided by the invention has the advantages that by adopting a mode of integrally arranging a freely lifting disperser in a planetary stirring paddle, compared with the existing double planetary or planetary dispersive equipment, dead angles in the kneading process of the equipment can be effectively reduced, and the kneading efficiency is improved, so that the integral dispersion uniformity of the final slurry is improved; compared with the prior three-star type equipment, the kneading and diluting device has the advantages that the kneading and diluting capabilities are obviously improved, and the preparation time of the slurry can be shortened under the condition of ensuring that the slurry obtains the same dispersing effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a slurry stirring device, which comprises a stirring container, wherein a planetary stirring paddle is arranged in the stirring container, a disperser is integrally arranged in the planetary stirring paddle, the slurry stirring device further comprises a lifting controller connected with the disperser, and a driver connected with the disperser and the planetary stirring paddle;
the lifting controller is used for controlling the disperser to lift along the axial direction of the planetary stirring paddle, and the driver is used for controlling the disperser and the planetary stirring paddle to rotate.
The driver comprises but is not limited to a servo motor in the prior art, and the driver is used for controlling the rotation and the revolution of the planetary stirring paddle and controlling the rotation of the disperser.
According to the slurry stirring device provided by the invention, by adopting the mode that the freely lifting disperser is integrated in the planetary stirring paddle, compared with the existing double planetary or planetary dispersive equipment, dead angles in the kneading process of the equipment can be effectively reduced, and the kneading efficiency is improved, so that the overall dispersion uniformity of the final slurry is improved.
According to the slurry stirring device provided by the invention, by adopting a mode of integrally arranging the freely lifting disperser in the planetary stirring paddle, compared with the traditional three-planetary equipment, the kneading diluting capacity is obviously improved, and the preparation time of slurry can be shortened under the condition of ensuring that the slurry obtains the same dispersing effect.
Preferably, the planet stirring rake includes stirring paddle leaf and set up in the rake of planet stirring rake shoulder and with stirring paddle leaf fixed connection's stirring transmission shaft, stirring transmission shaft with the driver is connected, the last through-hole that is provided with of stirring transmission shaft.
The stirring transmission shaft is connected with the driver, the connection mode is not limited, and the driver can smoothly drive the stirring transmission shaft to rotate.
Preferably, the disperser includes a dispersing disk and a dispersing transmission shaft fixedly connected with the dispersing disk, and the dispersing transmission shaft passes through the through hole and then is connected with the driver.
The dispersive transmission shaft is connected with the driver, the connection mode is not limited, and the driver can smoothly drive the dispersive transmission shaft to rotate.
Preferably, the inner diameter of the through hole is larger than the outer diameter of the dispersion drive shaft.
The inner diameter of the through hole is larger than the outer diameter of the dispersing transmission shaft, and the dispersing transmission shaft and the stirring transmission shaft are not in contact with each other and operate independently.
Preferably, the dispersion impeller is arranged on the axis of the stirring paddle and is positioned between the cross beam and the paddle shoulder of the planetary stirring paddle.
In a second aspect, the present invention provides a method for preparing an electrode slurry using the slurry stirring apparatus of the first aspect, the method comprising:
(1) The driver controls the planetary stirring paddle to rotate and revolve, the disperser rotates, and solid components of the electrode slurry arranged in the stirring container are mixed to obtain a first mixed material;
(2) The lifting controller controls the disperser to lift and leave the first mixed material, the first liquid component of the electrode slurry is added into the first mixed material at least once, and the driver controls the planetary stirring paddle to rotate and revolve after the first liquid component of the electrode slurry is added each time, so that a second mixed material is obtained;
(3) And the lifting controller controls the disperser to descend and then enter the second mixed material, at least one second liquid component of the electrode slurry is added into the second mixed material, the driver controls the planetary stirring paddle to rotate and revolve after the second liquid component of the electrode slurry is added every time, and the disperser rotates to obtain the electrode slurry.
According to the method for preparing the electrode slurry by using the slurry stirring device, the kneading efficiency can be improved, the liquid addition amount in the slurry kneading and diluting process can be reduced, and the solid content of the slurry prepared by adopting the method is correspondingly improved, so that the preparation cost of the slurry is reduced.
The electrode slurry prepared by the method provided by the invention has high uniformity and dispersibility, so that the content proportion of active substances in the slurry prepared by using the slurry stirring device can be increased under the condition of obtaining the same conductivity of the electrode plate, and the energy density of the electrode plate prepared by using the electrode slurry can be increased.
Preferably, the electrode slurry of step (1) includes a positive electrode slurry or a negative electrode slurry.
The solid components of the positive electrode slurry comprise a positive electrode active material, a positive electrode conductive agent and a positive electrode binder, wherein the positive electrode active material comprises lithium iron phosphate, the positive electrode conductive agent comprises conductive carbon black, the binder comprises polyvinylidene fluoride, and the mass ratio of the lithium iron phosphate to the conductive carbon black to the polyvinylidene fluoride is 94.5; the liquid component of the positive electrode slurry includes N-methylpyrrolidone.
The solid components of the cathode slurry comprise a cathode active material, a cathode conductive agent and a cathode dispersing agent; the negative electrode active material comprises graphite, the negative electrode conductive agent comprises conductive carbon black, the negative electrode dispersing agent comprises sodium carboxymethyl cellulose, the mass ratio of the graphite to the conductive carbon black to the sodium carboxymethyl cellulose is 96.
Preferably, the rotation speed of the planetary stirring paddle in the step (1) is 7-13 m/s, the revolution speed is 2-7 m/s, and the time is 20-60 min.
In the present invention, the rotation speed of the planetary paddles in step (1) is 7 to 13m/s, and may be, for example, 7m/s, 8m/s, 9m/s, 10m/s, 11m/s, 12m/s or 13m/s, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned values are also applicable.
In the present invention, the revolution speed of the planetary paddles in step (1) is 2 to 7m/s, and may be, for example, 2m/s, 3m/s, 4m/s, 5m/s, 6m/s or 7m/s, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In the invention, the time for the planetary stirring paddle to rotate and revolve in the step (1) is 20 to 60min, for example, 20min, 25min, 30min, 35min, 40min, 45min, 50min, 55min or 60min, but the time is not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the rotation speed of the disperser in the step (1) is 18-23 m/s, and the time is 20-60 min.
In the present invention, the rotation speed of the disperser in step (1) is 18 to 23m/s, and may be, for example, 18m/s, 18.5m/s, 19m/s, 19.5m/s, 20m/s, 20.5m/s, 21m/s, 21.5m/s, 22m/s, 22.5m/s or 23m/s, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned value range are also applicable.
In the present invention, the period of time for which the disperser rotates in step (1) is 20 to 60min, and may be, for example, 20min, 25min, 30min, 35min, 40min, 45min, 50min, 55min or 60min, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
Preferably, the method further comprises a standing period of 5-30 min between step (1) and step (2), such as 5min, 10min, 12min, 20min, 25min or 30min, but not limited to the recited values, and other values not recited in the range of values are also applicable.
Preferably, the planetary stirring paddle in the step (2) is divided into at least one stage, the rotation speed of the planetary stirring paddle in each stage is 15-45 m/s independently, the revolution speed of the planetary stirring paddle in each stage is 5-15 m/s independently, and the time is 20-90 min independently.
In the invention, in the step (2), the rotation and revolution of the planetary stirring paddle are divided into at least one stage, the rotation speed of the planetary stirring paddle in each stage is 15-45 m/s, for example, 15m/s, 20m/s, 25m/s, 30m/s, 35m/s, 40m/s or 45m/s, but the rotation speed is not limited to the recited values, and other values not recited in the numerical value range are also applicable.
In the invention, the rotation and revolution of the planetary stirring paddle in the step (2) are divided into at least one stage, the revolution speed of the planetary stirring paddle in each stage is 5-15 m/s, for example, 5m/s, 6m/s, 7m/s, 8m/s, 9m/s, 10m/s, 11m/s, 12m/s, 13m/s, 14m/s or 15m/s, but the rotation speed is not limited to the recited values, and other values in the range of the recited values are also applicable.
In the invention, the rotation and revolution of the planetary stirring paddle in the step (2) are divided into at least one stage, and the time of each stage is 20-90 min, for example, 20min, 30min, 40min, 50min, 60min, 70min, 80min or 90min, but the invention is not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the solids content of the second composition of step (2) is 60% to 85%, for example 60%, 65%, 70%, 75%, 80% or 85%, but not limited to the recited values, and other values not recited in this range are equally applicable.
Preferably, the disperser descends in the step (3) to reach the central position between the cross beam and the paddle shoulder of the planetary stirring paddle.
Preferably, the rotation speed of the planetary stirring paddle in the step (3) is 15-30 m/s, the revolution speed is 5-10 m/s, and the time is 20-90 min.
In the present invention, the rotation speed of the planetary stirring paddle in step (3) is 15 to 30m/s, and may be, for example, 15m/s, 20m/s, 25m/s or 30m/s, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In the present invention, the revolution speed of the planetary stirring blade in the step (3) is 5 to 10m/s, and may be, for example, 5m/s, 6m/s, 7m/s, 8m/s, 9m/s or 10m/s, but it is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In the invention, the rotation and revolution time of the planetary stirring paddle in the step (3) is 20-90 min, for example, 20min, 30min, 40min, 50min, 60min, 70min, 80min or 90min, but the planetary stirring paddle is not limited to the values listed, and other values not listed in the range of the values are also applicable.
Preferably, the rotation speed of the disperser in the step (3) is 18-23 m/s, and the time is 20-90 min.
In the present invention, the rotation speed of the disperser in step (3) is 18 to 23m/s, and may be, for example, 18m/s, 19m/s, 20m/s, 21m/s, 22m/s or 23m/s, but the present invention is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In the present invention, the time for rotating the disperser in step (3) is 20 to 90min, and may be, for example, 20min, 30min, 40min, 50min, 60min, 70min, 80min or 90min, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
Preferably, the viscosity of the electrode slurry in the step (3) is 4000-30000 cp, for example, 4000cp, 5000cp, 6000cp, 8000cp, 10000cp, 12000cp, 14000cp, 16000cp, 18000cp, 20000cp, 22000cp, 24000cp, 26000cp, 28000cp or 30000cp, but is not limited to the enumerated values, and other non-enumerated values in the range of the enumerated values are also applicable.
Preferably, the solid content of the electrode slurry in step (3) is 50-80%, for example, 50%, 55%, 60%, 65%, 70%, 75% or 80%, but not limited to the recited values, and other unrecited values in the range of the recited values are also applicable.
Preferably, the step (3) further comprises defoaming the electrode paste.
Preferably, the defoaming comprises the step that a driver controls the rotation and revolution of the planetary stirring paddle, the rotation speed is 9-18 m/s, the revolution speed is 3-6 m/s, and the time is 5-40 min, wherein the rotation and the revolution of the planetary stirring paddle are both reversed in the defoaming process.
The defoaming includes that the driver controls the rotation and revolution of the planetary stirring paddle, the rotation speed is 9-18 m/s, such as 9m/s, 10m/s, 11m/s, 12m/s, 13m/s, 14m/s, 15m/s, 16m/s, 17m/s or 18m/s, but the defoaming is not limited to the numerical value, and other numerical values not listed in the numerical value range are also applicable.
The defoaming includes that the driver controls the rotation and revolution of the planetary stirring paddle, the revolution speed is 3-6 m/s, for example, 3m/s, 3.5m/s, 4m/s, 4.5m/s, 5m/s, 5.5m/s or 6m/s, but the defoaming is not limited to the numerical values listed, and other numerical values not listed in the numerical value range are also applicable.
The defoaming comprises that the driver controls the planetary stirring paddle to rotate and revolve, the rotation and revolution time is 5-40 min, for example, 5min, 10min, 15min, 20min, 25min, 30min, 35min or 40min, but the defoaming is not limited to the enumerated values, and other non-enumerated values in the numerical range are also applicable.
In the defoaming process, the rotation and the revolution of the planetary stirring paddle are both reversed, the reversal is opposite to the rotation and the revolution of the planetary stirring paddle in other steps except the defoaming step, if the rest steps are operated clockwise, the reversal is operated anticlockwise, and if the rest steps are operated anticlockwise, the reversal is operated clockwise.
In a third aspect, the present invention provides an electrode paste obtained by the method of the second aspect.
In a fourth aspect, the invention provides a lithium ion battery comprising the electrode slurry of the third aspect.
In a fifth aspect, the present invention provides a vehicle including the lithium ion battery of the fourth aspect.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the slurry stirring device provided by the invention, by adopting the mode that the freely lifting disperser is integrated in the planetary stirring paddle, compared with the existing double planetary or planetary dispersive equipment, dead angles in the kneading process of the equipment can be effectively reduced, and the kneading efficiency is improved, so that the integral dispersion uniformity of the final slurry is improved;
(2) According to the slurry stirring device provided by the invention, by adopting the mode that the freely lifting disperser is integrated in the planetary stirring paddle, compared with the traditional three-planetary equipment, the kneading diluting capacity is obviously improved, and the preparation time of the slurry can be shortened under the condition that the same dispersing effect of the slurry is ensured;
(3) According to the method for preparing the electrode slurry by using the slurry stirring device, the kneading efficiency can be improved, the liquid addition amount in the slurry kneading and diluting processes can be reduced, and the solid content of the slurry prepared by adopting the method is correspondingly improved, so that the preparation cost of the slurry is reduced;
(4) The electrode slurry prepared by the method provided by the invention has high uniformity and dispersibility, so that the content proportion of active substances in the slurry prepared by using the slurry stirring device can be increased under the condition of obtaining the same conductivity of the electrode plate, and the energy density of the electrode plate prepared by using the electrode slurry can be increased.
Drawings
Fig. 1 is a schematic structural diagram of a slurry stirring device according to an embodiment of the present invention.
Wherein, 1-planet stirring paddle; 2-a disperser; 3-stirring blades; 4-paddle shoulder; 5-stirring a transmission shaft; 6-through holes; 7-a dispersion tray; 8-dispersing the transmission shaft; 9-beam.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
In one embodiment, as shown in fig. 1, the present invention provides a slurry stirring apparatus, which includes a stirring container (not shown in the figure), a planetary stirring paddle 1 disposed in the stirring container, a disperser 2 integrated inside the planetary stirring paddle 1, a lifting controller (not shown in the figure) connected to the disperser 2, and a driver (not shown in the figure) connected to the disperser 2 and the planetary stirring paddle 1;
the lifting controller is used for controlling the disperser 2 to lift along the axial direction of the planet stirring paddle 1, and the driver is used for controlling the disperser 2 and the planet stirring paddle 1 to rotate.
Further, planet stirring rake 1 includes stirring paddle leaf 3 and sets up on the oar shoulder 4 of planet stirring rake 1 and with stirring paddle leaf 3 fixed connection's stirring transmission shaft 5, stirring transmission shaft 5 is connected with the driver, be provided with through-hole 6 on the stirring transmission shaft 5.
Further, the disperser 2 comprises a dispersing disk 7 and a dispersing transmission shaft 8 fixedly connected with the dispersing disk 7, and the dispersing transmission shaft 8 is connected with the driver after passing through the through hole 6.
Further, the inner diameter of the through hole 6 is larger than the outer diameter of the dispersion transmission shaft 8.
Further, the dispersion disc 7 is arranged on the axis of the stirring paddle 3 and is positioned between the paddle shoulder 4 and the cross beam 9 of the planetary stirring paddle 1.
Example 1
The embodiment provides a method for preparing electrode slurry by using the slurry stirring device, which comprises the following steps:
(1) The driver controls the planetary stirring paddle 1 to rotate at the rotating speed of 10.5m/s and revolve at the rotating speed of 3.5m/s for 30min, the disperser 2 rotates at the rotating speed of 23m/s for 30min, and the lithium iron phosphate, the conductive carbon black and the polyvinylidene fluoride which are mixed and arranged in the stirring container according to the mass ratio of 94.5;
(2) The ascending and descending controller controls the disperser 2 to ascend and then leave the first mixed material, N-methyl pyrrolidone is added into the first mixed material, the driver controls the planetary stirring paddle 1 to rotate and revolve, the rotation and revolution of the planetary stirring paddle 1 are divided into two stages, the rotation speed of the planetary stirring paddle 1 in the first stage is 22.5m/s, the revolution speed is 7.5m/s, the time is 20min, the rotation speed of the planetary stirring paddle 1 in the second stage is 34.5m/s, the revolution speed is 11.5m/s, the time is 40min, N-methyl pyrrolidone is added, the driver controls the rotation and revolution of the planetary stirring paddle 1, the rotation speed of the planetary stirring paddle 1 is 34.5m/s, the revolution speed is 11.5m/s, and the time is 60min, and the second mixed material with the solid content of 69.32% is obtained;
(3) The ascending and descending controller controls the disperser 2 to descend and then reach the central position between the paddle shoulder 4 and the crossbeam 9 of the planetary stirring paddle 1, so that the mixture enters the second mixed material, N-methyl pyrrolidone is added into the second mixed material, the driver controls the planetary stirring paddle 1 to rotate at the rotating speed of 22.5m/s and revolve at the rotating speed of 7.5m/s for 40min, the disperser 2 rotates at the rotating speed of 23m/s for 40min, then N-methyl pyrrolidone is added, the driver controls the planetary stirring paddle 1 to rotate at the rotating speed of 22.5m/s and revolve at the rotating speed of 7.5m/s for 20min, the disperser 2 rotates at the rotating speed of 23m/s for 20min, so that the electrode slurry with the viscosity of 5000cp and the solid content of 56.5% is obtained, and the driver controls the planetary stirring paddle 1 to rotate at the rotating speed of 13.5m/s and revolve at the rotating speed of 4.5m/s so as to perform reverse rotation of 10min on the electrode slurry.
The fineness of the electrode slurry prepared by the embodiment is 20 microns, the anti-settling time is 30 hours, and the total slurry preparation time is 230min.
Example 2
The embodiment provides a method for preparing electrode slurry by using the slurry stirring device, and the method comprises the following steps:
(1) The driver controls the planetary stirring paddle 1 to rotate at the rotating speed of 7m/s and revolve at the rotating speed of 2m/s for 20min, the disperser 2 rotates at the rotating speed of 18m/s for 20min, and the graphite, the conductive carbon black and the sodium carboxymethyl cellulose which are arranged in the stirring container in a mass ratio of 96;
(2) The lifting controller controls the disperser 2 to lift and leave the first mixed material, deionized water is added into the first mixed material, the driver controls the planetary stirring paddle 1 to rotate and revolve, the rotation and revolution of the planetary stirring paddle 1 are divided into two stages, the rotation speed of the planetary stirring paddle 1 in the first stage is 15m/s, the revolution speed is 5m/s, the time is 40min, the rotation speed of the planetary stirring paddle 1 in the second stage is 24m/s, the revolution speed is 8m/s, and the time is 90min, then the deionized water is added, the driver controls the planetary stirring paddle 1 to rotate and revolve, the rotation speed of the planetary stirring paddle 1 is 45m/s, the revolution speed is 15m/s, and the time is 30min, and a second mixed material with 60% of solid content is obtained;
(3) The ascending and descending controller controls the disperser 2 to descend and then reach the central position between a paddle shoulder 4 of the planetary stirring paddle 1 and the crossbeam 9, so that the mixture enters a second mixture, deionized water is added into the second mixture, the driver controls the planetary stirring paddle 1 to rotate at the rotating speed of 15m/s and revolve at the rotating speed of 5m/s for 90min, the disperser 2 rotates at the rotating speed of 18m/s for 90min, styrene-butadiene rubber aqueous solution is added, the mass ratio of styrene-butadiene rubber in the styrene-butadiene rubber aqueous solution to graphite in the second mixture is 2.
The fineness of the electrode slurry prepared by the embodiment is 30 micrometers, the anti-settling time is 15 hours, and the total slurry preparation time is 335min.
Example 3
The embodiment provides a method for preparing electrode slurry by using the slurry stirring device, which comprises the following steps:
(1) The driver controls the planetary stirring paddle 1 to rotate at the rotating speed of 13m/s and revolve at the rotating speed of 7m/s for 60min, the disperser 2 rotates at the rotating speed of 18m/s for 60min, and the lithium iron phosphate, the conductive carbon black and the polyvinylidene fluoride which are mixed and arranged in the stirring container according to the mass ratio of 94.5 are mixed and arranged in the stirring container;
(2) The ascending and descending controller controls the disperser 2 to ascend and then leave the first mixed material, N-methyl pyrrolidone is added into the first mixed material, the driver controls the planetary stirring paddle 1 to rotate and revolve, the rotation and the revolution of the planetary stirring paddle 1 are divided into two stages, the rotation speed of the planetary stirring paddle 1 in the first stage is 15m/s, the revolution speed is 5m/s and the time is 90min, the rotation speed of the planetary stirring paddle 1 in the second stage is 30m/s, the revolution speed is 10m/s and the time is 50min, then the N-methyl pyrrolidone is added, the driver controls the rotation and the revolution of the planetary stirring paddle 1, the rotation speed of the planetary stirring paddle 1 is 45m/s, the revolution speed is 15m/s and the time is 20min, and the second mixed material with the solid content of 85% is obtained;
(3) The ascending and descending controller controls the disperser 2 to descend and then reach the central position between the paddle shoulder 4 and the beam 9 of the planetary stirring paddle 1, so that the mixture enters the second mixed material, N-methyl pyrrolidone is added into the second mixed material, the driver controls the planetary stirring paddle 1 to rotate at the rotating speed of 18m/s and revolve at the rotating speed of 6m/s for 50min, the disperser 2 rotates at the rotating speed of 23m/s for 50min, then the N-methyl pyrrolidone is added, the driver controls the planetary stirring paddle 1 to rotate at the rotating speed of 24m/s and revolve at the rotating speed of 8m/s for 90min, the disperser 2 rotates at the rotating speed of 23m/s for 90min, so that electrode slurry with the viscosity of 30000cp and the solid content of 80% is obtained, and the driver controls the planetary stirring paddle 1 to rotate at the rotating speed of 18m/s and revolve at the rotating speed of 6m/s so as to defoam the electrode slurry for 40min.
The fineness of the electrode slurry prepared by the embodiment is 20 micrometers, the anti-settling time is 31 hours, and the total slurry preparation time is 405min.
Comparative example 1
The present comparative example provides a method of preparing an electrode slurry using a double planetary stirring apparatus, the method comprising:
(1) The driver controls the planetary stirring paddle to rotate at the rotating speed of 10.5m/s and revolve at the rotating speed of 3.5m/s for 60min, and the lithium iron phosphate, the conductive carbon black and the polyvinylidene fluoride which are mixed and arranged in the stirring container according to the mass ratio of 94.5;
(2) Adding N-methyl pyrrolidone into the first mixed material, controlling the planetary stirring paddle to rotate and revolve by a driver, wherein the rotation and revolution of the planetary stirring paddle are divided into two stages, the rotation speed of the planetary stirring paddle in the first stage is 22.5m/s, the revolution speed is 7.5m/s, the time is 40min, the rotation speed of the planetary stirring paddle in the second stage is 34.5m/s, the revolution speed is 11.5m/s, the time is 80min, adding N-methyl pyrrolidone, controlling the rotation and revolution of the planetary stirring paddle by the driver, the rotation speed of the planetary stirring paddle is 34.5m/s, the revolution speed is 11.5m/s, and the time is 120min, so as to obtain a second mixed material with the solid content of 65.32%;
(3) And adding N-methyl pyrrolidone into the second mixed material, controlling the planetary stirring paddle to rotate at the rotating speed of 22.5m/s and revolve at the rotating speed of 7.5m/s for 80min by a driver, then adding the N-methyl pyrrolidone, controlling the planetary stirring paddle to rotate at the rotating speed of 22.5m/s and revolve at the rotating speed of 7.5m/s for 40min by the driver, thus obtaining the electrode slurry with the viscosity of 6000cp and the solid content of 51.5%, and controlling the planetary stirring paddle to rotate at the rotating speed of 13.5m/s and revolve at the rotating speed of 4.5m/s to perform reverse defoaming on the electrode slurry for 20min by the driver.
The fineness of the electrode slurry prepared by the embodiment is 30 micrometers, the anti-settling time is 12 hours, and the total time for preparing the slurry is 450min.
Comparative example 2
The present comparative example provides a method of preparing an electrode slurry with a three-planetary stirring apparatus, the method comprising:
(1) The driver controls the planetary stirring paddle to rotate at the rotating speed of 10.5m/s and revolve at the rotating speed of 3.5m/s for 60min, and the lithium iron phosphate, the conductive carbon black and the polyvinylidene fluoride which are mixed and arranged in the stirring container according to the mass ratio of 94.5;
(2) Adding N-methyl pyrrolidone into the first mixed material, controlling the planetary stirring paddles to rotate and revolve by a driver, wherein the rotation and revolution of the planetary stirring paddles are divided into two stages, the rotation speed of the planetary stirring paddles in the first stage is 22.5m/s, the revolution speed is 7.5m/s, the time is 20min, the rotation speed of the planetary stirring paddles in the second stage is 34.5m/s, the revolution speed is 11.5m/s, and the time is 40min, adding N-methyl pyrrolidone, controlling the rotation and revolution of the planetary stirring paddles by the driver, the rotation speed of the planetary stirring paddles is 34.5m/s, the revolution speed is 11.5m/s, and the time is 60min, so as to obtain a second mixed material with the solid content of 69.32%;
(3) And adding N-methyl pyrrolidone into the second mixed material, controlling a planetary stirring paddle to rotate at a rotating speed of 22.5m/s and revolve at a rotating speed of 7.5m/s for 180min by a driver, then adding the N-methyl pyrrolidone, controlling the planetary stirring paddle to rotate at a rotating speed of 22.5m/s and revolve at a rotating speed of 7.5m/s for 60min by the driver, thus obtaining the electrode paste with viscosity of 5500cp and solid content of 54.5%, and controlling the planetary stirring paddle to rotate at a rotating speed of 13.5m/s and revolve at a rotating speed of 4.5m/s to perform reverse defoaming on the electrode paste for 10min by the driver.
The fineness of the electrode slurry prepared by the embodiment is 25 micrometers, the anti-settling time is 20 hours, and the total slurry preparation time is 440min.
Comparative example 3
The present comparative example provides a method of preparing an electrode slurry with a planetary dispersive mixing apparatus, the method comprising:
(1) The driver controls the planetary stirring paddle to rotate at the rotating speed of 10.5m/s and revolve at the rotating speed of 3.5m/s for 40min, the disperser rotates at the rotating speed of 23m/s for 40min, and the first mixed material is obtained by mixing lithium iron phosphate, conductive carbon black and polyvinylidene fluoride which are arranged in the stirring container according to the mass ratio of 94.5;
(2) Adding N-methylpyrrolidone into the first mixed material, controlling the rotation and revolution of the planetary stirring paddle by a driver, wherein the rotation and revolution of the planetary stirring paddle are divided into two stages, the rotation speed of the planetary stirring paddle in the first stage is 22.5m/s, the revolution speed of the planetary stirring paddle in the first stage is 7.5m/s, the time is 80min, the rotation speed of the planetary stirring paddle in the second stage is 34.5m/s, the revolution speed of the planetary stirring paddle in the second stage is 11.5m/s, the time is 120min, adding N-methylpyrrolidone, controlling the rotation and revolution of the planetary stirring paddle by the driver, the rotation speed of the planetary stirring paddle in the second stage is 34.5m/s, the revolution speed of the planetary stirring paddle in the second stage is 11.5m/s, and the time is 160min, and obtaining a second mixed material with 65.32% of solid content;
(3) Adding N-methyl pyrrolidone into the second mixed material, controlling a planetary stirring paddle to rotate at the rotating speed of 22.5m/s and revolve at the rotating speed of 7.5m/s for 40min by a driver, controlling a disperser to rotate at the rotating speed of 23m/s for 40min, then adding the N-methyl pyrrolidone, controlling the planetary stirring paddle to rotate at the rotating speed of 22.5m/s and revolve at the rotating speed of 7.5m/s for 20min by the driver, controlling the disperser to rotate at the rotating speed of 23m/s for 20min to obtain the electrode paste with the viscosity of 5300cp and the solid content of 54.5%, and controlling the planetary stirring paddle to rotate at the rotating speed of 13.5m/s and revolve at the rotating speed of 4.5m/s to defoam the electrode paste for 10 min.
The fineness of the electrode slurry prepared by the embodiment is 24 microns, the anti-settling time is 20 hours, and the total slurry preparation time is 480min.
As can be seen by comparing the total time for preparing the electrode slurry in the above examples and comparative examples with the solid content of the obtained electrode slurry: according to the slurry stirring device provided by the invention, by adopting the mode that the freely lifting disperser 2 is integrated in the planetary stirring paddle 1, compared with the existing double planetary or planetary dispersive equipment, dead angles in the kneading process of the equipment can be effectively reduced, and the kneading efficiency is improved, so that the integral dispersion uniformity of the final slurry is improved; according to the slurry stirring device provided by the invention, by adopting the mode that the freely lifting disperser 2 is integrated in the planetary stirring paddle 1, compared with the traditional three-planetary equipment, the kneading diluting capacity is obviously improved, and the preparation time of slurry can be shortened under the condition of ensuring that the slurry obtains the same dispersing effect; according to the method for preparing the electrode slurry by using the slurry stirring device, the kneading efficiency can be improved, the liquid addition amount in the slurry kneading and diluting process can be reduced, and the solid content of the slurry prepared by adopting the method is correspondingly improved, so that the preparation cost of the slurry is reduced; the electrode slurry prepared by the method provided by the invention is high in uniformity and dispersibility, so that the content proportion of active substances in the slurry prepared by using the slurry stirring device can be increased under the condition of obtaining the same conductivity of the electrode plate, and the energy density of the electrode plate prepared by using the electrode slurry is increased.
The above description is only for the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure of the present invention.
Claims (10)
1. The slurry stirring device is characterized by comprising a stirring container, wherein a planetary stirring paddle is arranged in the stirring container, a disperser is integrally arranged in the planetary stirring paddle, the slurry stirring device further comprises a lifting controller connected with the disperser and a driver connected with the disperser and the planetary stirring paddle;
the lifting controller is used for controlling the disperser to lift along the axial direction of the planetary stirring paddle, and the driver is used for controlling the disperser and the planetary stirring paddle to rotate.
2. The slurry stirring device according to claim 1, wherein the planetary stirring paddle comprises a stirring paddle blade and a stirring transmission shaft which is arranged on a paddle shoulder of the planetary stirring paddle and is fixedly connected with the stirring paddle blade, the stirring transmission shaft is connected with the driver, and a through hole is arranged on the stirring transmission shaft.
3. The slurry stirring apparatus according to claim 2, wherein the disperser comprises a dispersing disk and a dispersing transmission shaft fixedly connected with the dispersing disk, and the dispersing transmission shaft passes through the through hole and then is connected with the driver.
4. The slurry stirring apparatus according to claim 3, wherein an inner diameter of the through-hole is larger than an outer diameter of the dispersion drive shaft.
5. The slurry stirring apparatus according to claim 3, wherein the dispersion plate is disposed on an axis of the stirring paddle and between a cross member of the planetary stirring paddle and the paddle shoulder.
6. A method for preparing an electrode slurry using the slurry stirring apparatus of any one of claims 1 to 5, comprising:
(1) The driver controls the planetary stirring paddle to rotate and revolve, the disperser rotates, and solid components of the electrode slurry arranged in the stirring container are mixed to obtain a first mixed material;
(2) The lifting controller controls the disperser to lift and leave the first mixed material, the first liquid component of the electrode slurry is added into the first mixed material at least once, and the driver controls the planetary stirring paddle to rotate and revolve after the first liquid component of the electrode slurry is added each time, so that a second mixed material is obtained;
(3) And the lifting controller controls the disperser to descend and then enter the second mixed material, at least one second liquid component of the electrode slurry is added into the second mixed material, the driver controls the planetary stirring paddle to rotate and revolve after the second liquid component of the electrode slurry is added every time, and the disperser rotates to obtain the electrode slurry.
7. The method as claimed in claim 6, wherein the rotation speed of the planetary stirring paddle in the step (1) is 7-13 m/s, the revolution speed is 2-7 m/s, and the time is 20-60 min;
preferably, the rotation speed of the disperser in the step (1) is 18-23 m/s, and the time is 20-60 min;
preferably, the method further comprises standing for 5-30 min between the step (1) and the step (2);
preferably, the planetary stirring paddles in the step (2) are divided into at least one stage, the rotation speed of the planetary stirring paddles in each stage is 15-45 m/s, the rotation speed of the planetary stirring paddles in each stage is 5-15 m/s, and the time is 20-90 min;
preferably, the solid content of the second mixed material in the step (2) is 60-85%;
preferably, in the step (3), the disperser descends to reach the central position between the cross beam and the paddle shoulder of the planetary stirring paddle;
preferably, the rotation speed of the planetary stirring paddle in the step (3) is 15-30 m/s, the revolution speed is 5-10 m/s, and the time is 20-90 min;
preferably, the rotation speed of the disperser in the step (3) is 18-23 m/s, and the time is 20-90 min;
preferably, the viscosity of the electrode slurry in the step (3) is 4000-30000 cp;
preferably, the solid content of the electrode slurry in the step (3) is 50-80%;
preferably, the step (3) further comprises defoaming the electrode slurry;
preferably, the defoaming comprises the step that the driver controls the rotation and revolution of the planetary stirring paddle, the rotation speed is 9-18 m/s, the revolution speed is 3-6 m/s, and the time is 5-40 min, wherein the rotation and the revolution of the planetary stirring paddle are both reversed in the defoaming process.
8. An electrode slurry obtained by the method according to claim 6 or 7.
9. A lithium ion battery comprising the electrode slurry of claim 8.
10. A vehicle characterized in that the vehicle comprises the lithium ion battery of claim 9.
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| CN216704005U (en) * | 2021-04-26 | 2022-06-10 | 欣旺达电动汽车电池有限公司 | Stirring device |
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