CN104587877A - Ultrasonic stirring apparatus for lithium ion battery electrode slurry - Google Patents
Ultrasonic stirring apparatus for lithium ion battery electrode slurry Download PDFInfo
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- CN104587877A CN104587877A CN201310528257.XA CN201310528257A CN104587877A CN 104587877 A CN104587877 A CN 104587877A CN 201310528257 A CN201310528257 A CN 201310528257A CN 104587877 A CN104587877 A CN 104587877A
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Abstract
Stirring homogenate is a key process during manufacture of a lithium ion secondary battery, and aims at homogenizing a slurry as much as possible. A present widely-known technology employs a motor for driving a stirring paddle for stirring the slurry, the stirring intensity generated by the stirring manner is not uniform in different positions in a slurry barrel, especially when the slurry viscosity is relatively high and the slurry is adhered to barrel walls, barrel corners and other places with relatively large curvature, and additionally, after a solid material is just added into the material barrel, the solid material is inclined to float at the surface of the wetted slurry or attach to barrel walls. During production, the solution is that the slurry or the solid material adhered to barrel walls is artificially stripped off, otherwise the stirring time is prolonged. According to the technical scheme, a spherical slurry stirring barrel is employed, a stirring paddle rotates at the sphere center, the periphery of the spherical material barrel is uniformly provided with ultrasonic transducers which give ultrasonic waves at the same time at the same phase, so that the ultrasonic superposed amplitude at the geometric center position of the spherical material barrel is increased, and violently cavitation mixing effect is generated at the center of the slurry stirring barrel. At the same time, the ultrasonic transducers attaching to the slurry stirring barrel enable the barrel walls to generate high-frequency mechanical oscillation, and the oscillation generates violent acting force at the interface between the metal barrel walls and the slurry because of abrupt change of density and elastic modulus. The comprehensive effect is that the solid material is easily wetted, and the wetted slurry is easy to homogenize.
Description
Technical field
The present invention relates to a kind of slurry agitation mode, in particular for the agitating mode of the both positive and negative polarity electrode slurry of lithium ion battery.
Background technology
At present, known lithium ion secondary battery electrode slurry is made up of electrode active material, conductive agent, adhesive and solvent etc.Positive electrode active materials is generally cobalt acid lithium, LiMn2O4 and LiFePO4, negative active core-shell material is generally graphite, the binding agent of positive pole and solvent are generally the organic system that PVDF and NMP is formed, and the binding agent of negative pole and solvent are then generally respectively the water-based system of SBR and water formation.By making beating to make between the liquid of composition electrode slurry with many kinds of solids material mutual mixes, dissolving, dispersion, finally reach and homogenize as much as possible.Slurry agitation occupies critical positions in lithium battery processing procedure.Stir the uniformity reached and determine the product such as internal resistance and cycle life key parameter to a great extent.Current known technology adopts driven by motor paddle to stir slurry, the diverse location of stirring intensity in charging basket that this agitating mode produces is even not, especially when slurry viscosity is higher, the place that slurry is attached on barrel wall and bucket edge curvature is large, even if the rotating speed strengthening paddle is also not easy to make the slurry be attached on barrel wall scatter.In addition the rotating speed strengthening paddle causes energy consumption to raise even can make slurry overheated.So sometimes in homogenate process by artificial interval with steel ruler being attached on barrel wall and the slurry of edge pushes around slurry slurry, the mode of remedying one of this manual intervention is labor intensive, two is that manual operation has larger uncertainty, affects the uniformity of product.In addition, after solid material just adds charging basket, solid material tends to float over the surface of wetting slurry, or be attached on barrel wall, especially negative active core-shell material graphite, be attached on barrel wall and show very strong orthostatic, the solution in production is attached to solid material or prolongation mixing time on barrel wall under artificial dialling.
Summary of the invention
The object of the invention is to overcome the diverse location of existing slurry stirring barrel stirring intensity in charging basket not evenly and need manual intervention too much, solid material is easy to be attached on barrel wall after adding simultaneously, not easily wetting problem.
For realizing above-mentioned technical purpose, the technical solution adopted in the present invention is:
The present invention adopts spherical slurry stirring barrel, paddle is positioned at centre of sphere place and rotates, at the uniform ultrasonic transducer of the surrounding of spherical charging basket, make each ultrasonic transducer simultaneously same-phase send ultrasonic wave, in spherical charging basket set geometric center position, ultrasonic superposition amplitude increases, produce strong cavitation immixture at slurry stirring barrel center, the efficiency of dispersion and the uniformity of gained slurry can be improved.Simultaneously, the ultrasonic transducer be attached on slurry stirring barrel makes barrel wall produce high-frequency mechanical vibration, the interface of this vibration between metal drum wall and slurry can produce strong active force due to the transition of density and elastic modelling quantity, can make to be attached to viscous syrup on slurry stirring barrel bucket wall or solid powder is peeled off.
Ultrasonic transducer is a kind of energy conversion device, and its function the electrical power of input is converted to mechanical output (i.e. ultrasonic wave) to pass again, and a part of power that its autophage is little.High-frequency electrical energy is converted to mechanical oscillation by transducer by ultrasonic wave.Employing ultrasonic transducer increases the energy utilization efficiency in whipping process.
Further optimization can be evenly arranged the ultrasonic transducer of more than 2 on paddle.Ultrasonic transducer on paddle rotates together with paddle.The efficiency of stirring can be improved further.Ultrasonic transducer on paddle is connected with ultrasound-driven power supply by electric brush slip ring.
The invention has the beneficial effects as follows:
Adopt spherical slurry stirring barrel and in the surrounding and paddle of spherical charging basket, ultrasonic transducer be installed, strong cavitation immixture can be produced at slurry stirring barrel center, make to be attached to active force that viscous syrup on slurry stirring barrel bucket wall or solid powder produce due to ultrasonic interface between metal drum wall and slurry simultaneously and peel off; Resultant effect is that solid material is easy to wetting, and slurry is easy to homogenize.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is electrode slurry agitating mode schematic diagram of the present invention.
In figure: 101: motor, 102: shaft coupling, 103: paddle, 104: size barrel, 105: cooling jacket, 106: ultrasonic transducer, 107: ultrasonic transducer driving power.
Detailed description of the invention
First carry out pretreatment to raw material to dewater to make it.Pretreatment mode is respectively, LiMn2O4 and PVDF120 degree Celsius baking 2 hours, SP and SO200 degree Celsius baking 2 hours, solvent NMP use dry molecular sieves dehydration.Take LiMn2O4 30 kilograms, SP900 gram, SO390 gram, PVDF970 gram, NMP19 kilogram.First NMP and PVDF is added charging basket, start the mixer shown in Fig. 1, dispersion pulp speed setting is 800 revs/min, stirs 60 minutes to obtain uniform glue.Then LiMn2O4, SP, SO are divided into 3 parts respectively, within every 30 minutes, add portion, maintaining dispersion pulp speed setting is 800 revs/min.Treat all powders completely soak by glue after, dispersion pulp speed setting is 2900 revs/min and carries out high-speed stirred, continue high-speed stirred 240 minutes.Ultrasonic transducer is opened, altogether uniform installation 13 ultrasonic transducers on spherical slurry stirring barrel wall, every power 120 watts, total ultrasonic power 1560 watts in whipping process.300 milliliters of slurries are got after stirring completes, use NDJ-1 type viscosimeter to measure viscosity under the condition of No. 4 rotors 30 turns of per minutes, drink according to the adjustment of viscosity measurement result and add NMP and use the mixing parametric identical with back to carry out stirring to reach target viscosities about 5500 centipoises.Then anode sizing agent was taken out 120 mesh sieves from charging basket.The slurry sieved is proceeded to down one painting process be coated with.
Claims (2)
1. a slurry stirring device, in particular for the positive and negative of lithium ion battery and electrode slurry agitating device, comprise the charging basket holding slurry and the paddle being driven adjustable speed by prime mover, paddle is connected with prime mover with transmission mechanism by shaft, it is characterized in that: adopt spherical slurry stirring barrel, described slurry stirring barrel bucket wall evenly installs multiple ultrasonic transducer.
2. a kind of slurry stirring device according to claim 1, it is characterized in that: the ultrasonic transducer being evenly arranged more than 2 on described paddle, ultrasonic transducer on paddle rotates together with paddle, and the ultrasonic transducer on described paddle is connected with ultrasound-driven power supply by electric brush slip ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310528257.XA CN104587877A (en) | 2013-10-31 | 2013-10-31 | Ultrasonic stirring apparatus for lithium ion battery electrode slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310528257.XA CN104587877A (en) | 2013-10-31 | 2013-10-31 | Ultrasonic stirring apparatus for lithium ion battery electrode slurry |
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| CN104587877A true CN104587877A (en) | 2015-05-06 |
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| CN201310528257.XA Pending CN104587877A (en) | 2013-10-31 | 2013-10-31 | Ultrasonic stirring apparatus for lithium ion battery electrode slurry |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299372A (en) * | 2016-08-31 | 2017-01-04 | 天津市捷威动力工业有限公司 | A kind of method improving slurry dispersion stabilization and coating homogeneity |
| CN109224989A (en) * | 2017-07-11 | 2019-01-18 | 湖北航鹏化学动力科技有限责任公司 | A kind of mixing preparation method of anode for lithium battery material |
| CN115025688A (en) * | 2021-03-03 | 2022-09-09 | 中国石油天然气股份有限公司 | Battery thick liquids homogenate equipment |
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| US4302112A (en) * | 1978-01-18 | 1981-11-24 | Reson System Aps | Process for continuous homogenization or emulsification of liquid and an ultrasonic apparatus for carrying out the process |
| CN2472808Y (en) * | 2000-09-28 | 2002-01-23 | 徐萌 | Perfume gas phase supersonic even mixer |
| CN1593742A (en) * | 2004-06-22 | 2005-03-16 | 周凤举 | Spherical kettle type stirred reactor |
| CN1595708A (en) * | 2004-06-24 | 2005-03-16 | 张燕珊 | Lithium ion cell slurry mixing method and special purpose mixing equipment therefor |
| CN201755469U (en) * | 2010-07-29 | 2011-03-09 | 柳州市豪杰特化工机械有限责任公司 | Multifunctional ultrasonic blender |
| CN201906604U (en) * | 2010-02-05 | 2011-07-27 | 严锦璇 | Clamping type ultrasonic processor |
| KR101109260B1 (en) * | 2009-07-09 | 2012-01-30 | 무유에스엠 주식회사 | Recycling mechanism of organic system wastes by subcritical point water and supersonic emission |
| CN202129043U (en) * | 2011-07-08 | 2012-02-01 | 浙江长城减速机有限公司 | Double planetary mixer with ultrasonic reinforced mixing device |
| CN202460531U (en) * | 2011-12-22 | 2012-10-03 | 吴江市德佐日用化学品有限公司 | Ultrasonic wave stirring machine |
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2013
- 2013-10-31 CN CN201310528257.XA patent/CN104587877A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4302112A (en) * | 1978-01-18 | 1981-11-24 | Reson System Aps | Process for continuous homogenization or emulsification of liquid and an ultrasonic apparatus for carrying out the process |
| CN2472808Y (en) * | 2000-09-28 | 2002-01-23 | 徐萌 | Perfume gas phase supersonic even mixer |
| CN1593742A (en) * | 2004-06-22 | 2005-03-16 | 周凤举 | Spherical kettle type stirred reactor |
| CN1595708A (en) * | 2004-06-24 | 2005-03-16 | 张燕珊 | Lithium ion cell slurry mixing method and special purpose mixing equipment therefor |
| KR101109260B1 (en) * | 2009-07-09 | 2012-01-30 | 무유에스엠 주식회사 | Recycling mechanism of organic system wastes by subcritical point water and supersonic emission |
| CN201906604U (en) * | 2010-02-05 | 2011-07-27 | 严锦璇 | Clamping type ultrasonic processor |
| CN201755469U (en) * | 2010-07-29 | 2011-03-09 | 柳州市豪杰特化工机械有限责任公司 | Multifunctional ultrasonic blender |
| CN202129043U (en) * | 2011-07-08 | 2012-02-01 | 浙江长城减速机有限公司 | Double planetary mixer with ultrasonic reinforced mixing device |
| CN202460531U (en) * | 2011-12-22 | 2012-10-03 | 吴江市德佐日用化学品有限公司 | Ultrasonic wave stirring machine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299372A (en) * | 2016-08-31 | 2017-01-04 | 天津市捷威动力工业有限公司 | A kind of method improving slurry dispersion stabilization and coating homogeneity |
| CN109224989A (en) * | 2017-07-11 | 2019-01-18 | 湖北航鹏化学动力科技有限责任公司 | A kind of mixing preparation method of anode for lithium battery material |
| CN115025688A (en) * | 2021-03-03 | 2022-09-09 | 中国石油天然气股份有限公司 | Battery thick liquids homogenate equipment |
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Application publication date: 20150506 |