CN109904385A - A kind of pole piece and preparation method thereof and lithium battery - Google Patents
A kind of pole piece and preparation method thereof and lithium battery Download PDFInfo
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Abstract
The present invention provides a kind of pole piece and preparation method thereof and lithium batteries.It the described method comprises the following steps: (1) high-speed mixing granulating machine is added in active material and conductive agent, is mixed, obtain mixed powder；(2) step (1) described mixed powder is mixed with binder, is mixed in the high-speed mixing granulating machine, obtains hybrid particles；(3) whole grain and screening are carried out to step (2) hybrid particles, is pressed into the pole piece.Preparation method provided by the invention makes the pole piece of preparation have preferable porosity while keeping higher pressure real density by the optimization to pelletization.Such pole piece makes battery have better discharge capability, the especially discharge capability under larger current and lower temperature conditions.Preparation method simple process provided by the invention, process is short, and automatization level height is, it can be achieved that from one process output of particle is dosed into.
Description
Technical field
The invention belongs to energy storage technologies field, it is related to a kind of pole piece and preparation method thereof and lithium battery.
Background technique
The common preparation method of lithium battery pole slice is to promote grain density by way of roll-in granulating, further promoted
The density of pole piece later mixes powder with binder specifically includes the following steps: powder is mixed, and is being rolled (usually
For roll-in), then carry out broken and sieve (i.e. granulating), finally it is pressed into pole piece.
As shown in Figure 1, rolling process in the prior art includes the powder that will be mixed and binder by rolling to roller
Using broken and screening, the lesser particle of partial size is obtained, completes roll-in granulating.
But the prior art, for lifting powder density as far as possible, usually at 10 tons or more, this will lead to pressure:
(1) roller-crushing mill damage speed is fast, and the consistency that the variation of roller compaction process roll gap will lead to particle is deteriorated；
(2) nipping process pressure is big, and binder is broken fracture in this process, cause made of the easy shedding of pole piece；
(3) particle internal void is forced to be squeezed and deformed, and pole piece internal holes are unevenly distributed.
The above problem is unevenly distributed aperture inside pole piece, will lead to the electricity of battery discharge procedure pole piece different zones
Current density is different, cannot utmostly play the discharge capability of battery；The depth of discharge of pole piece different zones is different simultaneously, expansion
Situation is not also identical, and Yi Fashengyin active material and collector are detached from battery resistance value caused by (picking) to battery during discharge
Become larger, the decline of latter stage pulse ability is rapid；Internal short-circuit of battery caused by may occurring when serious because of part picking.
CN103904303A discloses a kind of nano-scale lithium iron phosphate electrode piece preparation method of high capacity longevity.The program
The following steps are included: select Nano level powder of lithium iron phosphate be used as powder material, configuration LiFePO4 premixed liquid, mixed grinding,
Slurry is prepared, take pre- utter misery aluminium foil that slurry is evenly coated in the surface of pre- utter misery aluminium foil and passes through hot calender hot-rolling pressure, heating,
Being rolled compacted density is 2.8 ± 0.3g/cm3, smooth and uniform nano-grade lithium iron phosphate anode pole piece；And it is included in step
The step of any position before rapid four configures glue.
CN108470648A discloses a kind of porous electrode piece and preparation method thereof and capacitor.The program includes: that will lead
Electric agent, binder, active carbon and pore creating material carry out mixed processing and obtain mixture, wherein the binder is selected from Weight-average molecular
The polytetrafluoroethylene (PTFE) that amount is 5,000,000 or more；Air-flow crushing is carried out to the mixture；Roll-in is carried out to the mixture and obtains film
Piece；And hot combined processing is carried out after the diaphragm and collector are laminated and obtains the porous electrode piece.
CN108735528A discloses a kind of preparation process of super capacitor electrode slice containing PTFE fiber.The program is logical
The mode for crossing air-flow crushing makes PTFE powder realize fibrosis, and slurry is uniformly dispersed using stirring dispersion machine, utilizes roll-in
Electrode interior structure stabilization is finally obtained a kind of high-performance super capacitor electrode of binder system containing 3 D stereo by machine
Piece.
Above scheme realizes rolling and being crushed for powder using roll-in mode, there is roller-crushing mill damage speed is fast,
The consistency that the variation of roller compaction process roll gap will lead to particle is deteriorated；Nipping process pressure is big, and binder is broken disconnected in this process
It splits, leads to the easy shedding of manufactured pole piece；Particle internal void is forced to be squeezed and deformed, and pole piece internal holes are unevenly distributed to ask
Topic.
Summary of the invention
For the above-mentioned problems in the prior art, the purpose of the present invention is to provide a kind of pole pieces and preparation method thereof
And lithium battery.It is preferable that pole piece preparation method provided by the invention can be such that pole piece has while keeping higher pressure real density
Porosity, pole piece provided by the invention are the porous pole piece of high density.
To achieve this purpose, the present invention adopts the following technical scheme:
In a first aspect, the present invention provides a kind of pole piece preparation method, the described method comprises the following steps:
(1) high-speed mixing granulating machine is added in active material and conductive agent, is mixed, obtains mixed powder；
(2) step (1) described mixed powder is mixed with binder, is mixed in the high-speed mixing granulating machine,
Obtain hybrid particles；
(3) whole grain and screening are carried out to step (2) hybrid particles, is pressed into the pole piece.
In the present invention, by using high-speed mixing granulating machine, realizing makes pole piece while keeping higher pressure real density
With preferable porosity, the pole piece of preparation is the porous pole piece of high density.Such pole piece makes battery have preferably electric discharge
Ability, the especially discharge capability under larger current and lower temperature conditions.
In preparation method provided by the invention, step (1) can be achieved active material and mix with the uniform of conductive agent, and step
(2) the evenly dispersed and molecule of binder can be guaranteed by the superpower shearing force of high-speed mixing granulating machine and higher centrifugal force
Chain expansion, to achieve the purpose that make high density granular.
And preparation method manufacturing process provided by the invention is simple, and automatization level height is, it can be achieved that from particle is dosed into
By a process output.
High-speed mixing granulating machine of the present invention refers to stirring rate up to 100rpm or more, and shredder bar rate is reachable
The mixer-granulator of 1000rpm or more.
It is used as currently preferred technical solution below, but not as the limitation to technical solution provided by the invention, leads to
Following preferred technical solution is crossed, can preferably reach and realize technical purpose and beneficial effect of the invention.
As currently preferred technical solution, step (1) described active material includes graphite, hard carbon, soft carbon, ferric phosphate
In lithium, LiMn2O4, cobalt acid lithium, nickle cobalt lithium manganate, nickel cobalt lithium aluminate or manganese dioxide any one or at least two combination.
It is typical but be non-limiting combination and have: the combination of the combination of graphite and hard carbon, hard carbon and soft carbon, LiFePO4 and LiMn2O4
Combination, the combination of LiMn2O4 and cobalt acid lithium, nickle cobalt lithium manganate and the combination of nickel cobalt lithium aluminate etc..
Preferably, the conductive agent include in conductive black, electrically conductive graphite and conductive carbon nanotube any one or extremely
Few two kinds of combination.It is typical but be non-limiting combination and have: the combination of conductive black and electrically conductive graphite, electrically conductive graphite and conduction
The combination etc. of the combination of carbon nanotube, conductive black and conductive carbon nanotube.
The mass ratio of step (1) active material and conductive agent is 90:5-93:4, such as 90:5,91:5,92:5,93:
5 or 93:4 etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable.
As currently preferred technical solution, step (1) is described mixed during, high-speed mixing granulating machine
Stirring rate is 40-100rpm.Such as 40rpm, 50rpm, 60rpm, 70rpm, 80rpm, 90rpm or 100rpm etc., but not
It is only limitted to cited numerical value, other unlisted numerical value are equally applicable in the numberical range.In the present invention, if step (1)
It is described mixed during, the stirring rate of high-speed mixing granulating machine is too fast, will lead to powder spilling；If mixed at high speed
Granulator stirring rate is excessively slow, and will lead to material cannot be taken up, and mixing is uneven.
Preferably, step (1) is described mixed during, the shredder bar rate of high-speed mixing granulating machine is 400-
1000rpm, such as 400rpm, 500rpm, 600rpm, 700rpm, 800rpm, 900rpm or 1000rpm etc., it is not limited to
Cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable.If step (1) the mixed mistake
The shredder bar rate of Cheng Zhong, high-speed mixing granulating machine are too fast, will lead to conductive material and are broken up, are not able to maintain original performance；
If the shredder bar rate of high-speed mixing granulating machine is excessively slow, it is uneven to will lead to mixing.
Preferably, step (1) the mixed time is 3-10 minutes, such as 3 minutes, 4 minutes, 5 minutes, 6 points
Clock, 7 minutes, 8 minutes, 9 minutes or 10 minutes etc., it is not limited to cited numerical value, other are not arranged in the numberical range
The numerical value of act is equally applicable.
As currently preferred technical solution, step (2) described binder includes polytetrafluoroethylene (PTFE), carboxymethyl cellulose
In plain, poly- fluorinated ethylene derivative, Kynoar, Lithium polyacrylate or butadiene-styrene rubber any one or at least two group
It closes.It is typical but be non-limiting combination and have: the combination of polytetrafluoroethylene (PTFE) and carboxymethyl cellulose, polytetrafluoroethylene (PTFE) and butylbenzene rubber
The combination etc. of the combination of glue, carboxymethyl cellulose and butadiene-styrene rubber.
Preferably, in step (2), the mass ratio of mixed powder and binder is 95:5-97:3, such as 95:5,95.5:
4.5,96:4,96.5:3.5 or 97:3 etc., it is not limited to cited numerical value, other interior unlisted numbers of the numberical range
It is worth equally applicable.If binder additional amount is excessive, off-capacity will lead to, discharge performance is deteriorated；If binder additional amount
It is very few, will lead to anode can not form or anode picking.
Preferably, in step (2), the binder is added in the form of a solution.
Preferably, the binder is added in the form of a solution, and the solvent that the solution uses includes water.
Preferably, the binder is added in the form of a solution, and the concentration of binder is 0.4-1.0wt% in the solution,
Such as 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt% or 1.0wt% etc., it is not limited to cited number
Value, other interior unlisted numerical value of the numberical range are equally applicable.
As currently preferred technical solution, step (2) is described mixed during, high-speed mixing granulating machine
Stirring rate is 40-100rpm, such as 40rpm, 50rpm, 60rpm, 70rpm, 80rpm, 90rpm or 100rpm etc., but not
It is only limitted to cited numerical value, other unlisted numerical value are equally applicable in the numberical range.In the present invention, if step (2)
It is described mixed during, the stirring rate of high-speed mixing granulating machine is too fast, will lead to material spilling；If mixed at high speed
Granulator stirring rate is excessively slow, and it is uneven to will lead to mixing.
Preferably, step (2) is described mixed during, the shredder bar rate of high-speed mixing granulating machine is 400-
800rpm, such as 400rpm, 500rpm, 600rpm, 700rpm or 800rpm etc., it is not limited to cited numerical value, it should
Other unlisted numerical value are equally applicable in numberical range.In the present invention, if step (2) is described mixed during,
The stirring rate of high-speed mixing granulating machine is too fast, will lead to particle and is broken up, cannot be formed；If high-speed mixing granulating machine stirs
Rate is excessively slow, and will lead to can not be at particle, and grain density is relatively low.
Preferably, step (2) the mixed time is 3-10 minutes, such as 3 minutes, 4 minutes, 5 minutes, 6 points
Clock, 7 minutes, 8 minutes, 9 minutes or 10 minutes etc., it is not limited to cited numerical value, other are not arranged in the numberical range
The numerical value of act is equally applicable.
As currently preferred technical solution, the method for step (3) described whole grain is ball blast.
Preferably, step (3) mesh size used that sieves is 10-60 mesh.
Preferably, the method for step (3) described compacting is to be carried out beating piece with tablet machine.
As currently preferred technical solution, step (3) further include: after whole grain and screening, carried out to hybrid particles
Drying.
Preferably, the temperature of the drying be 130-200 DEG C, such as 130 DEG C, 140 DEG C, 150 DEG C, 160 DEG C, 170 DEG C,
180 DEG C, 190 DEG C or 200 DEG C etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are same
Sample is applicable in.
As the further preferred technical solution of preparation method of the present invention, the described method comprises the following steps:
(1) active material and conductive agent are added in high-speed mixing granulating machine and are mixed, high-speed mixing granulating machine is set
Stirring rate be 40-100rpm, shredder bar rate be 400-1000rpm, incorporation time be 3-10 minutes, obtain mixed powder
Material；
Wherein, the mass ratio of active material and conductive agent is 90:5-93:4；
(2) step (1) described mixed powder is mixed with adhesive solution, is carried out in the high-speed mixing granulating machine
Mixing, the stirring rate that high-speed mixing granulating machine is arranged is 40-100rpm, and shredder bar rate is 400-800rpm, incorporation time
It is 3-10 minutes, obtains hybrid particles；
Wherein, the mass ratio of mixed powder and binder is 95:5-97:3, in the adhesive solution, binder
Concentration is 0.4-1.0wt%；
(3) it carries out ball blast and 10-60 mesh screen to step (2) hybrid particles to sieve, 130-200 DEG C of drying, with beating
Piece machine breaks into the pole piece.
Second aspect, the present invention provide a kind of pole piece of preparation of preparation method as described in relation to the first aspect.
The third aspect, the present invention provide a kind of lithium battery, and the lithium battery pack is containing pole piece as described in relation to the first aspect.This hair
In bright, the lithium battery includes lithium metal battery and lithium ion battery.
Compared with prior art, the invention has the following advantages:
(1) preparation method provided by the invention makes the pole piece of preparation keep higher pressure by the optimization to pelletization
There is preferable porosity while real density.Such pole piece make battery have better discharge capability, especially compared with
Discharge capability under high current and lower temperature conditions.The apparent density of pole piece provided by the invention can achieve 1.30-
1.45g/cm3, compacted density can achieve 2.7-2.75g/cm3, while pole piece liquid absorption amount can achieve 17-19%.
(2) preparation method simple process provided by the invention, process is short, and automatization level is high, it can be achieved that from being dosed into
One process output of grain.
Detailed description of the invention
Fig. 1 is the operation chart of the existing roll-in process of granulation in background technique.
The flow diagram for the pole piece preparation method that Fig. 2 embodiment of the present invention 1 provides.
Specific embodiment
In order to better illustrate the present invention, it is easy to understand technical solution of the present invention, below further specifically to the present invention
It is bright.But following embodiments is only simple example of the invention, does not represent or limit the scope of the present invention, this
Invention protection scope is subject to claims.
The following are typical but non-limiting embodiments of the invention:
Embodiment 1
The present embodiment is prepared as follows positive plate:
(1) by active material MnO2It is added in high-speed mixing granulating machine and is mixed with conductive agent conductive carbon black, setting is high
The stirring rate of fast mixer-granulator is 40rpm, and shredder bar rate is 800rpm, and incorporation time is 7 minutes, obtains mixed powder
Material；
Wherein, the mass ratio of active material and conductive agent is 92:4；
(2) step (1) described mixed powder is mixed with polyfluortetraethylene of binding element aqueous solution, in the mixed at high speed system
It is mixed in grain machine, the stirring rate that high-speed mixing granulating machine is arranged is 80rpm, and shredder bar rate is 600rpm, when mixing
Between be 5 minutes, obtain hybrid particles, that is, pelletize；
Wherein, the mass ratio of mixed powder and binder is 96:4, and in the adhesive solution, the concentration of binder is
0.8wt%；
(3) ball blast is carried out to step (2) hybrid particles, and is sieved respectively with 12 mesh and 40 mesh screens, 160 DEG C of bakings
It is dry, pole piece is broken into tablet machine.
The flow diagram of pole piece preparation method provided in this embodiment is as shown in Figure 2.
The test result of pole piece manufactured in the present embodiment is shown in Table 1.
Embodiment 2
The present embodiment is prepared as follows negative electrode tab:
(1) by active material MnO2It is added in high-speed mixing granulating machine and is mixed with conductive agent conductive carbon black, setting is high
The stirring rate of fast mixer-granulator is 60rpm, and shredder bar rate is 1000rpm, and incorporation time is 7 minutes, obtains mixed powder
Material；
Wherein, the mass ratio of active material and conductive agent is 90:5；
(2) step (1) described mixed powder is mixed with polyfluortetraethylene of binding element aqueous solution, in the mixed at high speed system
It is mixed in grain machine, the stirring rate that high-speed mixing granulating machine is arranged is 100rpm, and shredder bar rate is 400rpm, when mixing
Between be 3 minutes, obtain hybrid particles；
Wherein, the mass ratio of mixed powder and binder is 95:5, and in the adhesive solution, the concentration of binder is
0.4mg/mL；
(3) ball blast is carried out to step (2) hybrid particles, and is sieved respectively with 12 mesh and 40 mesh screens, 160 DEG C of bakings
It is dry, pole piece is broken into tablet machine.
The test result of pole piece manufactured in the present embodiment is shown in Table 1.
Embodiment 3
The present embodiment is prepared as follows negative electrode tab:
(1) active material LiMn2O4 and conductive agent electrically conductive graphite are added in high-speed mixing granulating machine and are mixed, is arranged
The stirring rate of high-speed mixing granulating machine is 100rpm, and shredder bar rate is 400rpm, and incorporation time is 3 minutes, is mixed
Powder；
Wherein, the mass ratio of active material and conductive agent is 91:5；
(2) step (1) mixed powder is mixed with binder butadiene-styrene rubber aqueous solution, is pelletized in the mixed at high speed
It is mixed in machine, the stirring rate that high-speed mixing granulating machine is arranged is 40rpm, and shredder bar rate is 800rpm, incorporation time
It is 10 minutes, obtains hybrid particles；
Wherein, the mass ratio of mixed powder and binder is 96:4, and in the adhesive solution, the concentration of binder is
1.0wt%；
(3) ball blast is carried out to step (2) hybrid particles, and is sieved respectively with 10 mesh and 30 mesh screens, 130 DEG C of bakings
It is dry, pole piece is broken into tablet machine.
The test result of pole piece manufactured in the present embodiment is shown in Table 1.
Embodiment 4
The present embodiment is prepared as follows negative electrode tab:
(1) active material nickle cobalt lithium manganate and conductive agent conductive carbon nanotube are added in high-speed mixing granulating machine and are mixed
It closes, the stirring rate that high-speed mixing granulating machine is arranged is 80rpm, and shredder bar rate is 800rpm, and incorporation time is 10 minutes, is obtained
To mixed powder；
Wherein, the mass ratio of active material and conductive agent is 92:4；
(2) step (1) described mixed powder is mixed with binder carboxymethyl cellulose aqueous solution, in the mixed at high speed
It is mixed in granulator, the stirring rate that high-speed mixing granulating machine is arranged is 80rpm, and shredder bar rate is 1000rpm, mixing
Time is 5 minutes, obtains hybrid particles；
Wherein, the mass ratio of mixed powder and binder is 97:3, and in the adhesive solution, the concentration of binder is
0.8wt%；
(3) ball blast is carried out to step (2) hybrid particles, and is sieved respectively with 30 mesh and 60 mesh screens, 200 DEG C of bakings
It is dry, pole piece is broken into tablet machine.
The test result of pole piece manufactured in the present embodiment is shown in Table 1.
Comparative example 1
The pole piece of this comparative example the preparation method is as follows:
(1) by active material MnO2It is sufficiently mixed with conductive agent conductive carbon, then is sufficiently mixed with polytetrafluoroethylene (PTFE) binder
Afterwards, hybrid particles are prepared by the way of rolling to roller；
Wherein, active material, conductive agent, binder mass ratio be 92:4:4；
(2) ball blast is carried out to step (1) hybrid particles, and is sieved respectively with 12 mesh and 40 mesh screens, 160 DEG C of bakings
It is dry, pole piece is broken into tablet machine.
The test result of the pole piece of this comparative example preparation is shown in Table 1.
Test method
Pole piece prepared by each embodiment and comparative example is as positive plate, with lithium cathode sheet, electrolyte (1mol/L perchloric acid
The glycol dimethyl ether and carbonic allyl ester solution of lithium) and diaphragm be assembled into CR2032 battery, battery is tested.
Apparent density is tested using funnel method.
Pole piece compaction density is tested using pressed disc method.
Using the porosity of BET test pole piece.
Using the liquid absorption amount of minusing test pole piece.
Using Maccor pulse tester test pole piece under -40 DEG C, the pulse of 9mA electric current and 11ms on, 1s off into
Load voltage after row 256 times circulations.
The result of above-mentioned test see the table below:
Table 1
Based on the above embodiments with comparative example it is found that the pole piece that preparation method provided by the invention obtains is keeping higher pressure
There is preferable porosity while real density.Such pole piece make battery have better discharge capability, especially compared with
Discharge capability under high current and lower temperature conditions.Comparative example does not use the solution of the present invention but using common to roller
Rolling method, therefore in the comparable situation of compacted density, porosity directly results in the pole piece imbibition of comparative example not as good as embodiment
Measure the result not as good as embodiment.Meanwhile the present invention removes the button cell that can be used for tabletting mode, can obtain preferable battery performance
Outside, equally there is apparent improvement to the load capacity under the room temperature and cryogenic conditions of coiling type power type battery.
The Applicant declares that the present invention is explained by the above embodiments detailed features and method detailed of the invention, but
The invention is not limited to above-mentioned detailed features and method detaileds, that is, do not mean that the present invention must rely on above-mentioned detailed features
And method detailed could be implemented.It should be clear to those skilled in the art, any improvement in the present invention, to this hair
The bright equivalence replacement for selecting component and addition, the selection of concrete mode of auxiliary element etc., all fall within protection scope of the present invention
Within the open scope.
Claims (10)
1. a kind of pole piece preparation method, which is characterized in that the described method comprises the following steps:
(1) high-speed mixing granulating machine is added in active material and conductive agent, is mixed, obtains mixed powder；
(2) step (1) described mixed powder is mixed with binder, is mixed, is obtained in the high-speed mixing granulating machine
Hybrid particles；
(3) whole grain and screening are carried out to step (2) hybrid particles, is pressed into the pole piece.
2. preparation method according to claim 1, which is characterized in that step (1) described active material includes graphite, hard
In carbon, soft carbon, LiFePO4, LiMn2O4, cobalt acid lithium, nickle cobalt lithium manganate, nickel cobalt lithium aluminate or manganese dioxide any one or
At least two combination；
Preferably, the conductive agent includes any one in conductive black, electrically conductive graphite and conductive carbon nanotube or at least two
The combination of kind；
Preferably, the mass ratio of step (1) active material and conductive agent is 90:5-93:4.
3. preparation method according to claim 1 or 2, which is characterized in that step (1) is described mixed during,
The stirring rate of high-speed mixing granulating machine is 40-100rpm；
Preferably, step (1) is described mixed during, the shredder bar rate of high-speed mixing granulating machine is 400-
1000rpm；
Preferably, step (1) the mixed time is 3-10 minutes.
4. preparation method according to claim 1-3, which is characterized in that step (2) binder includes poly-
Appointing in tetrafluoroethene, carboxymethyl cellulose, poly- fluorinated ethylene derivative, Kynoar, Lithium polyacrylate or butadiene-styrene rubber
It anticipates a kind of or at least two combinations；
Preferably, in step (2), the mass ratio of mixed powder and binder is 95:5-97:3；
Preferably, in step (2), the binder is added in the form of a solution；
Preferably, the binder is added in the form of a solution, and the solvent that the solution uses includes water；
Preferably, the binder is added in the form of a solution, and the concentration of binder is 0.4-1.0wt% in the solution.
5. preparation method according to claim 1-4, which is characterized in that step (2) the mixed mistake
Cheng Zhong, the stirring rate of high-speed mixing granulating machine are 40-100rpm；
Preferably, step (2) is described mixed during, the shredder bar rate of high-speed mixing granulating machine is 400-
800rpm；
Preferably, step (2) the mixed time is 3-10 minutes.
6. preparation method according to claim 1-5, which is characterized in that the method for step (3) described whole grain is
Ball blast；
Preferably, step (3) mesh size used that sieves is 10-60 mesh；
Preferably, the method for step (3) described compacting is to be carried out beating piece with tablet machine.
7. preparation method according to claim 1-6, which is characterized in that step (3) further include: in whole grain and sieve
After point, hybrid particles are dried；
Preferably, the temperature of the drying is 130-200 DEG C.
8. preparation method according to claim 1-7, which is characterized in that the described method comprises the following steps:
(1) active material and conductive agent are added in high-speed mixing granulating machine and are mixed, stirring for high-speed mixing granulating machine is set
Mixing rate is 40-100rpm, and shredder bar rate is 400-1000rpm, and incorporation time is 3-10 minutes, obtains mixed powder；
Wherein, the mass ratio of active material and conductive agent is 90:5-93:4；
(2) step (1) described mixed powder is mixed with adhesive solution, is mixed in the high-speed mixing granulating machine
It closes, the stirring rate that high-speed mixing granulating machine is arranged is 40-100rpm, and shredder bar rate is 400-800rpm, and incorporation time is
3-10 minutes, obtain hybrid particles；
Wherein, the mass ratio of mixed powder and binder is 95:5-97:3, in the adhesive solution, the concentration of binder
For 0.4-1.0wt%；
(3) ball blast is carried out to step (2) hybrid particles and 10-60 mesh screen sieves, tablet machine is used in 130-200 DEG C of drying
Break into the pole piece.
9. a kind of pole piece prepared such as any one of claim 1-8 the method.
10. a kind of lithium battery, which is characterized in that the lithium battery pack contains pole piece as claimed in claim 9.
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| CN111146401A (en) * | 2019-12-17 | 2020-05-12 | 惠州亿纬锂能股份有限公司 | Preparation method of battery pole piece and battery |
| CN111864272A (en) * | 2020-06-09 | 2020-10-30 | 江苏大学 | High-safety volume energy density quasi-solid lithium ion battery and manufacturing method thereof |
| CN113740195A (en) * | 2021-08-03 | 2021-12-03 | 蜂巢能源科技有限公司 | Powder wettability evaluation method and application thereof |
| CN114899355A (en) * | 2022-06-29 | 2022-08-12 | 深圳市一众自动化技术有限公司 | Lithium ion battery electrode and preparation method thereof |
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