CN109411696A - A kind of coating method of cell electrode piece - Google Patents
A kind of coating method of cell electrode piece Download PDFInfo
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- CN109411696A CN109411696A CN201811376828.1A CN201811376828A CN109411696A CN 109411696 A CN109411696 A CN 109411696A CN 201811376828 A CN201811376828 A CN 201811376828A CN 109411696 A CN109411696 A CN 109411696A
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- cell electrode
- coating method
- electrode piece
- active material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0419—Methods of deposition of the material involving spraying
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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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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- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a kind of coating methods of cell electrode piece, belong to battery pole piece processing technique field.It solves the problems, such as to be homogenized complex process in existing cell electrode piece coating and pole piece performance is not high.The coating method of this cell electrode piece will be the following steps are included: A, selection collector, electrocondution slurry, which is coated in, make to form conductive glue layer in collection liquid surface on the collection liquid surface chosen；B, by positive electrode active material powder or negative electrode active material powder spray on the surface of above-mentioned glue electricity glue coat；C, the pole piece after dusting is dried and is rolled again, obtain corresponding cell electrode piece.The coating method of this cell electrode piece has the advantages that technique is simplified and pole piece performance is good.
Description
Technical field
The present invention relates to a kind of coating methods of cell electrode piece, belong to battery pole piece processing technique field.
Background technique
Currently, the production technology of existing cell electrode piece mainly include glue, mixing (homogenate), coating, baking and
The processes such as roll-in, wherein mixing is to mix positive/negative active material, conductive agent and other additives and glue
Homogenization process, that is to say, that homogenization process is most heavy in entire battery core production process in the process of existing electrode plates
One of step wanted, the superiority and inferiority of slurry directly affect battery core performance, in addition, homogenate process time-consuming is more, influence entire electricity
The production capacity of core production.In order to make some defects for avoiding homogenate from being deposited and avoid needing to consume a large amount of energy in pole piece preparation process
Amount is to remove organic solvent, the method continuously dusted with hot setting serialization using high energy mixing-, such as Chinese patent application
(publication number: CN 108172767A) discloses a kind of preparation method of electrodes of lithium-ion batteries, by solvent-free existing item
Under part, positive electrode active materials or negative electrode active material, high polymer binder, solid electrolyte and auxiliary agent are carried out it is uniformly mixed,
Corresponding uniformed powder is obtained, then uniformed powder is continuously coated in foil surface and forms one layer of electrode powder layer, passes through solidification
So that material is carried out fusion and forms continuous electrode film layer.Although the pollution this method avoid solvent to environment, still need
Positive electrode active materials or negative electrode active material are subjected to uniformly mixed process, it is often more important that, use pure powder to mix
Be easily lead to the decline of pole piece quality it is difficult to ensure that powder is uniformly mixed, and using pure powder during dusting due to powder
End is very light, and under the micro-disturbance of very little, powder will be fallen, and is difficult to fix on a current collector, not can guarantee the powder on collector
End amount, to influence the quality of pole piece；Meanwhile need to be solidified in the later period, it is substantially equivalent to be to the slow of binder
Melt, can have a large amount of gap and bubble in such pole piece, show pole piece disadvantage as dew foil, make electric conductivity be deteriorated or
The phenomenon that occurring the fracture of pole piece crisp chip in the cross cutting or winding process of later period pole piece or dropping off.
Summary of the invention
The present invention is directed to the above defect existing in the prior art, provides a kind of carbamoylamino pyrazole derivative compounds
Preparation method, solve the problems, such as it is that homogenate how to be avoided to realize the performance for simplifying technique and guaranteeing corresponding pole piece.
The purpose of the present invention is achieved by the following technical programs, a kind of coating method of cell electrode piece, special
Sign is, method includes the following steps:
A, collector is chosen, electrocondution slurry, which is coated on the collection liquid surface chosen, to be made to form conduction in collection liquid surface
Glue coat；
B, by positive electrode active material powder or negative electrode active material powder spray on the surface of above-mentioned glue electricity glue coat；
C, the pole piece after dusting is dried and is rolled again, obtain corresponding cell electrode piece.
The conductive glue layer with certain viscosity is formed by applying electrocondution slurry on a current collector in advance, can be made in this way
Pole piece has high adhesive force and electric conductivity, and this makes it possible to guarantee in positive electrode active materials or the negative electrode active of dusting
When material, their adhesive force between collection liquid surface make the conductive glue layer surface of significantly more efficient attachment, and by mentioning
Preceding painting electrocondution slurry, which forms conductive glue layer, can also make conductive agent more fully play a role；To allow to pass through compacting
Guarantee the dense surface of pole piece and the thickness of entire battery, improves battery pack (PACK) utilization rate；Meanwhile by advance will be conductive
Slurry is coated in collection liquid surface, is the equal of using to coat wet film conducting resinl on a current collector directly next to dusting
Coat directly dusts when conducting resinl also has suitable viscosity, guarantees that active material can effectively be embedded in conducting resinl
It is interior, improve adhesive force；And the present invention needs not move through curing process, more energy efficient in production, strong operability effectively avoids out
Existing gap or bubble.In addition, the present invention by dusting positive/negative active material on conductive gel coating, can live for positive/negative
Property material powder conductive network is provided, the binder, conductive agent after subsequent drying, due to the evaporation of solvent, in electrocondution slurry
It is connected to chain lock shape each other with active material powder substance, formation is network-like, makes have better adhesive force；And the present invention takes
Disappeared homogenate process, the time-consuming more and high problem of energy consumption of homogenate process is effectively eliminated, to also effectively reduce battery
The energy consumption of production and production cost is advantageously reduced, can also guarantee the quality of cell electrode piece.
In the coating method of above-mentioned cell electrode piece, preferably, conductive glue layer described in the step A
With a thickness of 1~3mm.Anode and cathode active materials powder during dusting can be made more effectively to be attached with its surface, make have compared with
Good insertion effect makes the effect for more effectively guaranteeing to improve adhesive force；Meanwhile also can effectively ensure that ultimately form it is higher
Energy density effect.
In the coating method of above-mentioned cell electrode piece, preferably, electrocondution slurry described in step A is mainly by bonding
Agent, conductive agent and solvent composition.Table by the collector that such material is mixed to form electrocondution slurry in advance and is coated in advance
Face can be such that binder preferentially contacts with collector, be conducive to increase cohesive force, improve the effect of adhesive force, and without considering
Be homogenized caused by there are problems that of positive and negative active material, allow to effectively avoid homogenate process, improve production efficiency and
The impact of performance of pole piece.When correspondence is positive electrode active material powder, binder in the electrocondution slurry: solvent: conductive agent=
1:10~20:0.5~3；When correspondence is negative electrode active material powder, binder in the electrocondution slurry: solvent: conductive agent=
1:40~70:0~5.
In the coating method of above-mentioned cell electrode piece, preferably, the conductive agent is selected from carbon black, Ketjen black, carbon
One or more of nanotube, carbon nano-fiber and electrically conductive graphite.Raw material is easy to get and the effect due to conducting electricity very well.As
Further preferred, the conductive agent is carbon ink.
In the coating method of above-mentioned cell electrode piece, preferably, the binder be selected from aqueous binders and/or
Oiliness binder, the solvent are selected from water.Make that there is preferable caking property, more effectively guarantees that electrocondution slurry is adhered to collector
Surface.As a further preference, the aqueous binders be selected from methylcellulose, methylcellulose lithium, polyacrylate,
One or more of polymethyl methacrylate and polyvinyl alcohol；The oiliness binder is selected from Kynoar.
In the coating method of above-mentioned cell electrode piece, preferably, being dusted described in step B using line streaming, point
The mode of dusting of shape stream or planar stream is by positive electrode active material powder or the uniform spray attachment of negative electrode active material powder in afflux body surface
On the conductive glue layer in face.It can make the surface for being sprayed on conductive gel coating that anode and cathode active materials powder is more uniform
On, make that there is better pole piece performance.
In the coating method of above-mentioned cell electrode piece, preferably, the temperature of drying described in step C be 50 DEG C~
130℃.Solvent can be made effectively to volatilize removal, make that chain lock shape can be interconnected between each material, formed network-like, made
With better adhesive force, whole performance is improved, and the present invention only need to remove solvent by drying, without making binder
In melting state, it also can be avoided and gap or bubble phenomenon occur, advantageously ensure that the mass effect of pole piece.
In the coating method of above-mentioned cell electrode piece, positive electrode active material powder or negative electrode active material feed powder therein
End uses active material commonly used in the art, will not influence the key factor that the present invention needs not move through homogenized,
It can guarantee that there is preferable effect.Preferably, the positive electrode active material powder is selected from cobalt acid lithium, LiMn2O4, ferric phosphate
Lithium, phosphoric acid vanadium lithium, ternary material and/or rich manganese material；The negative electrode active material powder is selected from graphite based material, silicon systems material
Material, tin based material, lithium titanate and/or two-dimensional material graphene.
In conclusion compared with prior art, the present invention having the advantage that
1. active material can be made directly next to dusting by the way that electrocondution slurry is coated in collection liquid surface in advance
Material can be effectively embedded in conducting resinl, improve adhesive force；And the present invention needs not move through curing process, it is more energy efficient in production,
Strong operability effectively avoids the occurrence of gap or bubble.
2. the time-consuming more and high problem of energy consumption of homogenate process is effectively eliminated, to also have by cancelling homogenate process
Effect the energy consumption for reducing battery production and advantageously reduce production cost, can also guarantee the quality of cell electrode piece.
Specific embodiment
Below by specific embodiment, the technical solutions of the present invention will be further described, but the present invention is simultaneously
It is not limited to these embodiments.
Embodiment 1
It is proportionally selected to be formed after binder methylcellulose, conductive black and aqueous solvent are mixed evenly and lead
Then plasma-based material, then carries out on the copper foil of affluxion body surface of selection coating and makes to form conductive glue layer on the surface thereof, controls
System coating with a thickness of 2mm；Again and then using powder spraying apparatus by positive electrode active material powder or negative electrode active material powder into
The line streaming spraying method of row continuous spray is sprayed on the surface of above-mentioned glue electricity glue coat；Powder spraying apparatus is set in the present embodiment
Tape running speed be 3m/min, the amount of dusting is 10g/s, and certainly, tape running speed and the amount of dusting can be adjusted according to the actual situation
Whole, positive electrode active material powder can use LiFePO4 here, and negative electrode active material powder can use graphite based material；When
It can also so be substituted using other anode and cathode active materials powder, then the pole piece after dusting is dried, drying temperature
Degree is 100 DEG C, after drying makes solvent volatilization completely, then carries out being rolled into certain thickness, obtains corresponding battery positive pole piece
Or cathode pole piece.By test, obtained cathode pole piece does not occur gap or bubble phenomenon, pole piece be not present because of gap or
The influence of bubble and the defect for generating pole piece dew point, and subsequent cross cutting or winding process in will not occur being broken etc. it is existing
As.
Embodiment 2
Proportionally selected from binder polymethyl methacrylate, Ketjen black and aqueous solvent carry out that rear shape is mixed evenly
At electrocondution slurry, then, then carries out on the current collector aluminum foil surface of selection coating and make to form conductive glue on the surface thereof
Layer, control coating with a thickness of 3mm；And then use powder spraying apparatus by positive electrode active material powder or negative electrode active material feed powder again
The line streaming spraying method that end carries out continuous spray is sprayed on the surface of above-mentioned glue electricity glue coat；Setting is dusted in the present embodiment
The tape running speed of equipment is 5m/min, and the amount of dusting is 13g/s, certainly, tape running speed and the amount of dusting can according to the actual situation into
Row adjustment, positive electrode active material powder can use LiMn2O4 here, and negative electrode active material powder can use two-dimensional material stone
Black alkene；It can certainly be substituted using other anode and cathode active materials powder, then the pole piece after dusting is dried
Dry, drying temperature is 120 DEG C, after drying makes solvent volatilization completely, then carries out being rolled into certain thickness, obtains corresponding battery
Anode pole piece or cathode pole piece.By test, obtained cathode pole piece does not occur gap or bubble phenomenon, and pole piece is not present
Generate the defect of pole piece dew point because of the influence of gap or bubble, and subsequent cross cutting or winding process in will not occur
Phenomena such as fracture.
Embodiment 3
It is formed after proportionally selecting binder polymethyl methacrylate, Ketjen black and aqueous solvent to be mixed evenly
Then electrocondution slurry, then carries out on the current collector aluminum foil surface of selection coating and makes to form conductive glue layer on the surface thereof,
Control coating with a thickness of 1mm；And then use powder spraying apparatus by positive electrode active material powder or negative electrode active material powder again
The line streaming spraying method for carrying out continuous spray is sprayed on the surface of above-mentioned glue electricity glue coat；Setting, which is dusted, in the present embodiment sets
Standby tape running speed is 4m/min, and the amount of dusting is 8g/s, and positive electrode active material powder can use ternary material manganese phosphate here
Iron lithium powder, negative electrode active material powder can use electrically conductive graphite powder；It can certainly be using other positive and negative electrode activity
Material powder is substituted, then is dried to the pole piece after dusting, and drying temperature is 50 DEG C, and drying keeps solvent volatilization complete
Afterwards, it then carries out being rolled into certain thickness, obtains corresponding battery positive pole piece or cathode pole piece.By test, what is obtained is negative
Pole pole piece does not occur gap or bubble phenomenon, and pole piece, which is not present, generates lacking for pole piece dew point because of the influence of gap or bubble
Fall into, and subsequent cross cutting or winding process in phenomena such as fracture will not occur.
Embodiment 4
Proportionally select binder polymethyl methacrylate and polyvinyl alcohol mixture, and poly-methyl methacrylate acid with
The mass ratio of polyvinyl alcohol is 2:1, and Ketjen black and aqueous solvent form electrocondution slurry after being mixed evenly, then, then
Carried out on the current collector aluminum foil surface of selection coating make to form conductive glue layer on the surface thereof, control coating with a thickness of
2mm；And then the dotted stream spraying method that positive electrode active material powder carries out continuous spray is sprayed on using powder spraying apparatus again
The surface of above-mentioned glue electricity glue coat；The tape running speed that powder spraying apparatus is arranged in the present embodiment is 4m/min, and the amount of dusting is 10g/
S makes the surface density 3.0mg/cm of the single side of the pole piece on surface2, positive electrode active material powder can use ternary material here
Iron manganese phosphate lithium powder；The pole piece after dusting to be dried again, drying temperature is 80 DEG C, after drying makes solvent volatilization completely,
It is rolled again, obtains corresponding battery positive pole piece.By test, obtained cathode pole piece does not occur gap or bubble
Phenomenon, pole piece, which is not present, generates the defect of pole piece dew point because of the influence of gap or bubble, and subsequent cross cutting or winding
Will not occur phenomena such as fracture in the process.
Embodiment 5
Conductive paste is formed after proportionally selecting binder polyvinyl alcohol, Ketjen black and aqueous solvent to be mixed evenly
Material, can make polyvinyl alcohol here: Ketjen black: then mass ratio=1:0.5~3:10~20 of aqueous solvent, then are being chosen
Copper foil of affluxion body surface on carry out coating make to form conductive glue layer on the surface thereof, control coating with a thickness of 3mm；Again
And then the dotted stream spraying method that positive electrode active material powder carries out continuous spray is sprayed on by above-mentioned glue using powder spraying apparatus
The surface of electric glue coat；The tape running speed and the amount of dusting that powder spraying apparatus is arranged in the present embodiment make to form single side on pole piece
Surface density is 4.0mg/cm2, positive electrode active material powder can use cobalt acid lithium powder here；The pole piece after dusting is carried out again
Drying, drying temperature are 130 DEG C, after drying makes solvent volatilization completely, then are rolled, obtain corresponding battery positive pole piece.
By test, obtained cathode pole piece does not occur gap or bubble phenomenon, and the influence because of gap or bubble is not present in pole piece
And generate the defect of pole piece dew point, and subsequent cross cutting or winding process in phenomena such as fracture will not occur.
Embodiment 6
Conductive paste is formed after proportionally selecting binder polyvinyl alcohol, conductive black and aqueous solvent to be mixed evenly
Material, can make polyvinyl alcohol here: conductive black: mass ratio=1:0.1~5.0:40~70 of aqueous solvent, then, then
Carried out on the current collector aluminum foil surface of selection coating make to form conductive glue layer on the surface thereof, control coating with a thickness of
2mm；And then the planar stream spraying method that negative electrode active material powder carries out continuous spray is sprayed on using powder spraying apparatus again
The surface of above-mentioned glue electricity glue coat；The tape running speed that powder spraying apparatus is arranged in the present embodiment is 5m/min, and the amount of dusting is 10g/
S, the tape running speed and the amount of dusting that powder spraying apparatus is arranged in the present embodiment make the surface density 3.0mg/ that single side is formed on pole piece
cm2, negative electrode active material powder can use graphite based material powder here；The pole piece after dusting is dried again, is dried
Temperature is 50 DEG C, after drying makes solvent volatilization completely, then is rolled, obtains corresponding negative pole piece of battery.By test, obtain
To cathode pole piece do not occur gap or bubble phenomenon, there is no pole piece dew is generated because of the influence of gap or bubble for pole piece
Point defect, and subsequent cross cutting or winding process in phenomena such as fracture will not occur.
It randomly selects corresponding anode pole piece that above-described embodiment 1 obtains and cathode pole piece is tested for the property, pass through mould
It cuts, lamination, soldering polar ear, the processes such as encapsulation, fluid injection are assembled into battery, are tested accordingly.Specifically: end charge and discharge
Voltage is 1.7V~2.8V (vs.Li/Li+)。
Under 3C charge and discharge carry out cycle performance test, the composite material its show good cycle performance.It puts for the first time
Electric specific capacity reaches 149mAh g-1, by 1000 circulation volume conservation rates 94%, there is preferable cycle performance of battery；
It is able to satisfy 50C and continues charge and discharge.
Specific embodiment described in the present invention only illustrate the spirit of the present invention by way of example.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
It is skilled to this field although present invention has been described in detail and some specific embodiments have been cited
For technical staff, as long as it is obvious for can making various changes or correct without departing from the spirit and scope of the present invention.
Claims (9)
1. a kind of coating method of cell electrode piece, which is characterized in that method includes the following steps:
A, collector is chosen, electrocondution slurry, which is coated on the collection liquid surface chosen, to be made to form conducting resinl painting in collection liquid surface
Coating；
B, by positive electrode active material powder or negative electrode active material powder spray on the surface of above-mentioned glue electricity glue coat；
C, the pole piece after dusting is dried and is rolled again, obtain corresponding cell electrode piece.
2. the coating method of cell electrode piece according to claim 1, which is characterized in that conducting resinl described in step A applies
Coating with a thickness of 1~3mm.
3. the coating method of cell electrode piece according to claim 1, which is characterized in that electrocondution slurry described in step A
Mainly it is made of binder, conductive agent and solvent.
4. the coating method of cell electrode piece according to claim 3, which is characterized in that the conductive agent be selected from carbon black,
One or more of Ketjen black, carbon nanotube, carbon nano-fiber and electrically conductive graphite.
5. according to the coating method of the cell electrode piece of claim 3 or 4, which is characterized in that the binder is selected from water
Property binder and/or oiliness binder, the solvent is selected from water.
6. the coating method of cell electrode piece according to claim 5, which is characterized in that the aqueous binders are selected from first
One or more of base cellulose, methylcellulose lithium, polyacrylate, polymethyl methacrylate and polyvinyl alcohol；Institute
It states oiliness binder and is selected from Kynoar.
7. the coating method of cell electrode piece described in -4 any one according to claim 1, which is characterized in that institute in step B
It states and dusts positive electrode active material powder or negative electrode active material powder using the mode of dusting of line streaming, dotted stream or planar stream
Uniform spray attachment is on the conductive glue layer of collection liquid surface.
8. the coating method of cell electrode piece described in -4 any one according to claim 1, which is characterized in that institute in step C
The temperature for stating drying is 50 DEG C~130 DEG C.
9. the coating method of cell electrode piece described in -4 any one according to claim 1, which is characterized in that the anode is living
Property material powder be selected from cobalt acid lithium, LiMn2O4, LiFePO4, phosphoric acid vanadium lithium, ternary material and/or rich manganese material；The cathode
Active material powder is selected from graphite based material, silicon systems material, tin based material, lithium titanate and/or two-dimensional material graphene.
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| CN110085868A (en) * | 2019-04-25 | 2019-08-02 | 浙江锋锂新能源科技有限公司 | Lithium an- ode and preparation method thereof and the method for preparing all-solid-state battery |
| CN110707292A (en) * | 2019-08-06 | 2020-01-17 | 湖南华慧新能源股份有限公司 | Preparation method of lithium titanate negative electrode plate |
| CN111987373A (en) * | 2020-08-11 | 2020-11-24 | 天津力神电池股份有限公司 | Solid electrolyte coating based on positive electrode protection, positive plate and preparation method |
| CN112201771A (en) * | 2020-10-14 | 2021-01-08 | 惠州亿纬锂能股份有限公司 | Pole piece, preparation method thereof and lithium ion battery |
| CN113036072A (en) * | 2021-03-03 | 2021-06-25 | 昆山宝创新能源科技有限公司 | Dry electrode and preparation method thereof |
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| CN115842092A (en) * | 2021-11-16 | 2023-03-24 | 宁德时代新能源科技股份有限公司 | Multilayer coating pole piece, secondary battery, battery module, battery pack and electric device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110085868A (en) * | 2019-04-25 | 2019-08-02 | 浙江锋锂新能源科技有限公司 | Lithium an- ode and preparation method thereof and the method for preparing all-solid-state battery |
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| CN112201771A (en) * | 2020-10-14 | 2021-01-08 | 惠州亿纬锂能股份有限公司 | Pole piece, preparation method thereof and lithium ion battery |
| CN113036072A (en) * | 2021-03-03 | 2021-06-25 | 昆山宝创新能源科技有限公司 | Dry electrode and preparation method thereof |
| CN113113608A (en) * | 2021-04-13 | 2021-07-13 | 昆山宝创新能源科技有限公司 | Pole piece, preparation method of pole piece, battery core and battery |
| CN113206222A (en) * | 2021-05-06 | 2021-08-03 | 合肥国轩高科动力能源有限公司 | Method for preparing lithium battery pole piece with low solvent and prepared pole piece |
| CN115842092A (en) * | 2021-11-16 | 2023-03-24 | 宁德时代新能源科技股份有限公司 | Multilayer coating pole piece, secondary battery, battery module, battery pack and electric device |
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Application publication date: 20190301 |