CN207615663U - Passive metal lithium powder preparation facilities - Google Patents
Passive metal lithium powder preparation facilities Download PDFInfo
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- CN207615663U CN207615663U CN201721733935.6U CN201721733935U CN207615663U CN 207615663 U CN207615663 U CN 207615663U CN 201721733935 U CN201721733935 U CN 201721733935U CN 207615663 U CN207615663 U CN 207615663U
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Abstract
The utility model is related to lithium ion battery manufacturing fields, disclose a kind of passive metal lithium powder preparation facilities.The lithium powder preparation facilities includes atomising mechanism and closed passivation storehouse, is connected inside the dispersive nozzle of the atomising mechanism and passivation storehouse, the passivation air-flow spout being connected with inside passivation storehouse is provided in the passivation storehouse.The device will be atomized and passivation carries out integrated design, it is directly in contact with the lithium jet stream of atomization using passivation air-flow, the temperature taken out of by lithium jet stream is passivated reaction, compared to the tradition mode that first cooling is passivated again, it not only can be energy saving, moreover it is possible to keep the passivation of lithium powder more abundant；And passivation air-flow can promote lithium metal to be further atomized to a certain extent with lithium jet interactions, improve the balling-up effect of passivation of lithium powder；In addition, passivation air-flow may also function as cooling effect, lithium powder is made to be fully cooled setting before contacting bulkhead.
Description
Technical field
The utility model is related to lithium ion battery manufacturing field, especially a kind of passive metal lithium powder preparation facilities.
Background technology
Lithium ion battery is one of highest battery system of energy density in current commercialization secondary cell, commercialization lithium from
Sub- battery has good circulation and safety in utilization, it is obtained in fields such as communication, electronic equipment, industrial products and gas vehicles
A large amount of application.
It is found in the research of lithium ion battery operation principle, before lithium ion battery several times in charge and discharge cycles, electricity
Tankage will appear 10~20% or so rapid decay.It has been investigated that this is because in initial cyclic process several times,
Surface (mainly cathode) meeting one layer of solid electrolyte layer with protective effect of self-assembling formation of positive and negative electrode material, that is, be commonly called as
SEI films.This tunic can constantly consume the lithium ion in battery system in growth course, cause to can move freely in system
Lithium ion lacks, so as to cause the decaying of battery capacity.
In order to solve to reduce battery capacity due to generating SEI films and lithium ion is caused to consume, FMC Corp. of U.S. researcher is first
First propose that lithium powder is added in lithium ion battery can effectively offset above-mentioned irreversible capacity, lithium powder is molten in cell operations
Solution releases lithium ion to make up the lithium ion consumed in SEI film forming processes.As a result show that this method achieves significantly
Achievement, the addition of lithium powder are effectively offset the loss of lithium ion, improve the first charge-discharge efficiency of battery, and then improve electricity
The ratio energy (battery capacity improves 10%~20%) in pond.In addition, the introducing of metallic lithium powder can also effectively extend battery
Cycle life.These conclusions are proven in the research of follow-up Japanese SHIN-ETSU HANTOTAI chemistry, South Korea SKC Power Tech etc..
The method for preparing metallic lithium powder mainly has paddling process, liquid ammonia process for caustic soda purification and spray-on process.Paddling process is in inert liquid medium
It is middle to melt lithium, with high speed machine stir method, be allowed to be emulsifiable in liquid-carrier, be then cooled to melting point metal hereinafter,
And the metal powder of carrier must be scattered in.Liquid ammonia process for caustic soda purification is that lithium metal is dissolved in liquefied ammonia, and all solution are poured into inert media,
It stirs at normal temperatures, makes ammonia volatilization to get metal powder.Spray-on process is the pressure using argon gas, and the lithium of fusing is sprayed powdering,
It is collected in inert media.
Paddling process technology is the most ripe, and utilization is the most extensive, as patent US5567474, US5776369,
The files such as US5976403, CN105489852A, WO2007/005983, CN200780037907.3 disclose stirring legal system
The relevant programme of standby metallic lithium powder.The advantage of paddling process is that safe operation, controllability are high, and lithium Powder Particle Size is uniform.But it stirs
Method prepares metallic lithium powder needs and is carried out in hydrocarbon ils, is inevitably produced in the heating process of hydrocarbon ils using the above method
Phenomena such as coking of hydrocarbon oil, thus will produce largely rotten hydrocarbon ils.The hydrocarbon ils of these coking can not reuse, and not
Easy removal of impurities processing, can only be burnt as waste.Also, carrys out stable metal lithium powder in hydrocarbon ils and be necessarily required to organic solvent
Come remove metallic lithium powder surface attachment hydrocarbon ils, the most commonly used is be attached to passive metal lithium powder surface using pentane to wash away
Hydrocarbon ils.First, the volatility of pentane is stronger, is easy for volatilizing at normal temperatures, the respiratory tract of the serious stimulation applications personnel of meeting, behaviour
Need wearing correlative protection apparatus that could operate as personnel.Secondly, in order to ensure the hydrocarbon ils on passive metal lithium powder surface is complete
It washes off, the amount of the pentane of each washing needs consumption is also larger.Lithium Powder Particle Size made from liquid ammonia process for caustic soda purification is thin, can be in room temperature, low temperature
Lower progress, but need freezing equipment, and ammonia consumption is big, therefore, rare report in the prior art.
In contrast, the equipment of spray-on process and operation are the simplest, cost is the cheapest, and not will produce extra dirt
Contaminate object.But the controllability that the technique of lithium powder is prepared in existing spray-on process is relatively low, and the second-rate of lithium powder is made, therefore,
Very understatement road in the prior art, but with the improvement of technique, spray-on process has more good relative to paddling process and liquid ammonia process for caustic soda purification
Foreground.
Utility model content
The technical problem to be solved by the utility model is to provide one kind, low energy consumption and the better passive metal of passivation effect
Lithium powder preparation facilities.
Passive metal lithium powder preparation facilities disclosed by the utility model, including atomising mechanism and closed passivation storehouse, it is described
The dispersive nozzle of atomising mechanism and passivation storehouse inside be connected, be provided in the passivation storehouse be passivated storehouse inside be connected it is blunt
Change air-flow spout.
Preferably, the dispersive nozzle of the atomising mechanism is arranged in opposite directions with passivation air-flow spout.
Preferably, the atomising mechanism is set to passivation the top of the warehouse center, and the passivation air-flow notch setting is in passivation storehouse
Bottom centre, the passivation orlop portion are also associated with passivation of lithium powder collecting mechanism.
Preferably, the passivation of lithium powder collecting mechanism includes rotor segment and lithium powder collecting bin, the lithium powder collecting bin with
Passivation orlop portion is connected, the rotor segment fitting be set to passivation storehouse lower part and with lithium powder collecting bin lower section shape
It is adapted.
Preferably, the passivation storehouse is up-small and down-big taper.
Preferably, the passivation orlop portion is provided with up-small and down-big frustum structure, and the passivation air-flow spout is through cone
It is connected inside platform structure and passivation storehouse.
Preferably, the top top in the passivation storehouse is provided with exhaust outlet.
Preferably, the atomising mechanism is plasma gun.
Preferably, the spacing between the dispersive nozzle and passivation air-flow spout is 150cm~300cm.
The utility model has the beneficial effects that：The passive metal lithium powder preparation facilities will be atomized and passivation carries out integration and sets
Meter is directly in contact with the lithium jet stream of atomization using passivation air-flow, and the temperature taken out of by lithium jet stream is passivated reaction, compares
It, not only can be energy saving in the tradition mode that first cooling is passivated again, moreover it is possible to keep the passivation of lithium powder more abundant；And passivation air-flow
Lithium metal can be promoted further to be atomized to a certain extent with lithium jet interactions, improve the balling-up effect of passivation of lithium powder；
In addition, passivation air-flow may also function as cooling effect, lithium powder is made to be fully cooled setting before contacting bulkhead.
Description of the drawings
Fig. 1 is the schematic diagram of the utility model；
Reference numeral：Atomising mechanism 1 is passivated storehouse 2, passivation air-flow spout 3, rotor segment 4, lithium powder collecting bin 5, exhaust outlet
6, lithium jet stream 7 is passivated air-flow 8, passivation reaction area 9.
Fig. 2 is the SEM figures of passive metal lithium powder prepared by the embodiment of the present invention 1 (engineer's scale is 100 μm).
Fig. 3 is the SEM figures of passive metal lithium powder prepared by the embodiment of the present invention 1 (engineer's scale is 10 μm).
Specific implementation mode
The utility model is further illustrated below in conjunction with the accompanying drawings.
As shown in Figure 1, the passive metal lithium powder preparation facilities of the utility model, including atomising mechanism 1 and closed passivation
It is connected inside storehouse 2, the dispersive nozzle of the atomising mechanism 1 and passivation storehouse 2, be provided in the passivation storehouse 2 and is passivated in storehouse 2
The passivation air-flow spout 3 that portion is connected.
When using the lithium powder preparation facilities, lithium metal is put into and melts in atomising mechanism 1 and is made using inert gas
It is sprayed into the state of dispersed jet in passivation storehouse 2, meanwhile, passivation air-flow 8 is admitted to from passivation air-flow spout 3 in passivation storehouse 2,
Lithium jet stream 7, which is in contact with passivation air-flow 8 in passivation storehouse 2, occurs passivation reaction, generates passive metal lithium powder.Atomising mechanism 1 can
Using existing all kinds of metal atomization equipment, wherein with plasma gun best results.Carbon dioxide may be used in passivation air-flow 8
Or the gaseous mixture etc. of carbon dioxide and inert gas.
For the interaction reinforced lithium jet stream 7 be passivated air-flow 8, the dispersive nozzle and passivating gas of the atomising mechanism 1
Flow spout 3 in opposite directions arrange, lithium jet stream 7 with passivation air-flow 8 realize reverse contact-impact in passivation reaction area 9, can make lithium powder with
It is more abundant to be passivated the contact of air-flow 8, is conducive to improve passivation effect.In lithium jet stream 7, bulky grain cooling velocity is slower, uncolled
At solid bulky grain under the impact of reverse passivation air-flow, it can be further crushed, to which passivation of lithium powder can be improved
The uniformity of degree.By adjusting the speed of lithium jet stream 7, the flow velocity of reverse passivation air-flow 8 and dispersive nozzle and passivation air-flow spout 3
Between spacing the adjusting of granularity and passivation effect to passivation of lithium powder may be implemented.For obtaining the lithium powder of high quality, when
7 speed v of lithium jet stream1It is reverse to be passivated air velocity v for 50~250m/s2For 100~300m/s, dispersive nozzle and reverse passivating gas
When stream 3 spacing of spout is 150~300cm, best results.
After passivation of lithium powder generates in passivation storehouse 2, a variety of collection modes may be used and collected, for example, can adopt
It is collected with pneumatic extract into dust collecting, but such mode can together be extracted together with the gas in passivation storehouse 2, be produced
Raw gas flowing can increase the control difficulty of lithium jet stream 7 and passivation air-flow, do to lithium jet stream 7 and the raw disturbance of passivating gas miscarriage
Disturb the control to passivation of lithium silty amount.For this purpose, the utility model preferably use airless disturb gravity sinking mode to lithium powder into
Row is collected, specifically, the atomising mechanism 1 is set to passivation 2 top center of storehouse, the passivation air-flow spout 3 is set to blunt
2 bottom centre of Hua Cang, 2 bottom of passivation storehouse are also associated with passivation of lithium powder collecting mechanism.Wherein lithium powder collecting mechanism can be used
Common loophole shape structure etc., and it is preferred that, the passivation of lithium powder collecting mechanism includes that rotor segment 4 and lithium powder are received
Collect storehouse 5, the lithium powder collecting bin 5 is connected with passivation 2 bottom of storehouse, and the fitting of the rotor segment 4 is set to passivation 2 lower part of storehouse simultaneously
And it is adapted with 5 lower section shape of lithium powder collecting bin.It is preferred that hinge type scraper plate is used, in order to arrange transmission.Rotor segment 4
The lithium powder that rotation will fall to passivation 2 bottom of storehouse is scraped to collecting in lithium powder collecting bin 5.
Lithium powder is collected as a result of the mode of gravitational settling, in order to reduce raising up for lithium powder, the passivation storehouse 2 is upper
Small lower big taper.This structure make majority raise up lithium powder contact passivation 2 conical inboard wall of storehouse, with storehouse conical inboard wall collide after again
Sinking is got off.And in order to further facilitate the collection of lithium powder, passivation 2 bottom of storehouse is provided with up-small and down-big frustum structure,
The passivation air-flow spout 3 is connected inside frustum structure and passivation storehouse 2.Passivation air-flow spout 3 has gas outflow, lithium powder
It is difficult to enter, the lithium powder part of sinking is collected as the side wall of frustum structure falls to passivation 2 bottom of storehouse.
Passivation storehouse 2 in, participate in atomization inert gas and part unreacted it is complete passivation air-flow 8 needs be discharged, arrange
Gas port 6 can be unified with lithium powder collecting mechanism, and collecting lithium powder for example, by using extraction mode then need not separately set exhaust outlet 6, if but
Collect lithium powder using gravitational settling mode then need to be arranged exhaust outlet 6 on the top top in passivation storehouse 2, to prevent exhaust from influencing lithium powder
Collection, and reduce lithium powder from exhaust outlet 6 overflow.
The preparation that metallic lithium powder is passivated using the utility model patent is further illustrated in the form of embodiment below.
Embodiment 1
Before powder processed, the air in passivation storehouse 2 is taken away with vaccum-pumping equipment, then argon gas is filled with to normal pressure toward the inside, with
Ensure that entire pulverizing process carries out under protection of argon gas, prevents oxygen and nitrogen in air from reacting with lithium powder.Using etc.
Ion spray gun is atomising mechanism, and ensures that the dispersive nozzle of atomising mechanism 1 and passivation air stream outlet spacing are 150cm.By metal
Lithium silk is put into fusing in atomising mechanism 1 and so that it is sprayed into passivation storehouse 2 with the state of dispersed jet using argon gas, meanwhile, often
Temperature passivation air-flow 8 (carbon dioxide) is admitted to from passivation gas channel 3 in passivation storehouse 2, and lithium jet stream 7 is being passivated with passivation air-flow 8
It is in contact in storehouse 2 and passivation reaction occurs, it is cooling simultaneously, generate passive metal lithium powder.The spouting velocity of control lithium jet stream 7 is
50m/s, the spouting velocity for being passivated air-flow are 100m/s.
The SEM figures for the passive metal lithium powder being prepared using this method are shown in Fig. 2 and Fig. 3, the performance of passive metal lithium powder
It is shown in Table 2.
Embodiment 2~5
Using the method for embodiment 1, only change the spouting velocity of lithium jet stream 7 and spray temperature, is passivated the ejection speed of air-flow
Degree, dispersive nozzle and passivation air stream outlet spacing, the setting of parameter are shown in Table 1, and obtained metallic lithium powder performance is shown in Table 2.
Table 1
Table 2
Wherein, practical passivation effect characterizes in the following way：Passivation of lithium powder is exposed in the environment of relative humidity 40%,
When pure metal lithium content is reduced to for 80% time.
Claims (9)
1. passive metal lithium powder preparation facilities, it is characterised in that：Including atomising mechanism (1) and closed passivation storehouse (2), the mist
Change and be connected inside the dispersive nozzle and passivation storehouse (2) of mechanism (1), is provided in the passivation storehouse (2) internal with passivation storehouse (2)
The passivation air-flow spout (3) being connected.
2. passive metal lithium powder preparation facilities as described in claim 1, it is characterised in that：The atomization of the atomising mechanism (1)
Spout is arranged in opposite directions with passivation air-flow spout (3).
3. passive metal lithium powder preparation facilities as claimed in claim 2, it is characterised in that：The atomising mechanism (1) is set to
It is passivated storehouse (2) top center, the passivation air-flow spout (3) is set to passivation storehouse (2) bottom centre, passivation storehouse (2) bottom
Portion is also associated with passivation of lithium powder collecting mechanism.
4. passive metal lithium powder preparation facilities as claimed in claim 3, it is characterised in that：The passivation of lithium powder collecting mechanism packet
Rotor segment (4) and lithium powder collecting bin (5) are included, the lithium powder collecting bin (5) is connected with passivation storehouse (2) bottom, the rotation
Scraper plate (4) fitting is set to passivation storehouse (2) lower part and is adapted with lithium powder collecting bin (5) lower section shape.
5. passive metal lithium powder preparation facilities as claimed in claim 4, it is characterised in that：Passivation storehouse (2) inner space
For up-small and down-big taper.
6. passive metal lithium powder preparation facilities as described in claim 4 or 5, it is characterised in that：Passivation storehouse (2) bottom is set
It is equipped with up-small and down-big frustum structure, the passivation air-flow spout (3) is connected inside frustum structure and passivation storehouse (2).
7. passive metal lithium powder preparation facilities as claimed in claim 3, it is characterised in that：On the top of passivation storehouse (2)
Portion is provided with exhaust outlet (6).
8. passive metal lithium powder preparation facilities as claimed in claim 2, it is characterised in that：The dispersive nozzle and passivation air-flow
Spacing between spout (3) is 150cm~300cm.
9. passive metal lithium powder preparation facilities as described in claim 1, it is characterised in that：The atomising mechanism (1) be it is equal from
Sub- spray gun.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721733935.6U CN207615663U (en) | 2017-12-13 | 2017-12-13 | Passive metal lithium powder preparation facilities |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108015294A (en) * | 2017-12-13 | 2018-05-11 | 天齐锂业股份有限公司 | The preparation method and device of passive metal lithium powder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108015294A (en) * | 2017-12-13 | 2018-05-11 | 天齐锂业股份有限公司 | The preparation method and device of passive metal lithium powder |
| CN108015294B (en) * | 2017-12-13 | 2024-09-20 | 天齐锂业股份有限公司 | Method and device for preparing passivated metal lithium powder |
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