CN109830689A - Lithium battery pole slice and preparation method thereof and lithium battery - Google Patents
Lithium battery pole slice and preparation method thereof and lithium battery Download PDFInfo
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- CN109830689A CN109830689A CN201910058686.2A CN201910058686A CN109830689A CN 109830689 A CN109830689 A CN 109830689A CN 201910058686 A CN201910058686 A CN 201910058686A CN 109830689 A CN109830689 A CN 109830689A
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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
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- 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
Abstract
The invention discloses lithium battery pole slices and preparation method thereof and lithium battery.Wherein, the method for lithium battery pole slice is prepared comprising steps of (1) forms carbon containing conductive layer at least part surface of collector；(2) the carbon containing conductive layer is activated；(3) electrode slurry is applied to the carbon containing conductive layer by the activation processing, obtains the lithium battery pole slice.For this method by activating to the carbon containing conductive layer in pole piece, the cohesive force being remarkably improved between carbon containing conductive layer and electrode slurry obtains the lithium battery pole flake products of high-quality.
Description
Technical field
The present invention relates to field of batteries, specifically, the present invention relates to lithium battery pole slices and preparation method thereof and lithium battery.
Background technique
Lithium-ion-power cell has higher requirement, but mesh to the energy density of battery, cyclical stability and high rate performance
The lithium ion battery of preceding listing still has some defects, if active material and collector binding force are poor, the companion in pole piece production process
Battery capacity becomes smaller caused by reducing with more serious 5S problem and because of pole piece active material and Capacity uniformity is deteriorated, and
With the increase of cycle-index in the use process of battery, the film layer of active material is easy to fall off from collector, cause
Cycle performance of battery is deteriorated.
The dusting problems generated for pole piece cohesive force difference in lithium battery pole slice production process, currently used improvement side
Method is the content of binder (SBR, PVDF or LA133 etc.) to be improved in the formula of pole piece, but binder content mentions in being formulated
It is high to will lead to battery deteriorated low temperature performance again.Patent CN105336912A discloses a kind of enhancing affluxion body in lithium ion batteries and work
The method of property substance cohesive force, uses carbon elements gas to utilize under vacuum conditions as carbon source in airtight cavity
Ion glow discharge principle deposits one layer of carbon-coating in collection liquid surface, which can effectively improve active material
With the cohesive force of collector.But this method is expensive and cannot achieve the online deposited carbon layer of coating process, and the carbon-coating deposited
Thinner thickness, it is limited to the improvement of cohesive force.Patent CN108511685A and CN108511689A are individually disclosed containing conduction
Positive and negative anodes electrodes of lithium-ion batteries of coating and preparation method thereof, by coating the carbon containing of one layer of 1~5 μ m-thick on a current collector
Conductive layer improves pole piece cohesive force by increasing the specific surface area of active material layer and collector.But this method is to conductive thickness
Degree is limited less than or equal to the improvement of 5 μm of pole piece cohesive force, and especially for cathode pole piece, dusting problems are still serious.Thus, it is existing
Some lithium battery pole slices and preparation method thereof still have much room for improvement.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is the method that proposition prepares lithium battery pole slice, and the lithium battery pole slice that is prepared by this method and including
The lithium battery of the lithium battery pole slice.This method is remarkably improved carbon containing lead by activating to the carbon containing conductive layer in pole piece
Cohesive force between electric layer and electrode slurry obtains the lithium battery pole flake products of high-quality.
In one aspect of the invention, the invention proposes a kind of methods for preparing lithium battery pole slice.It is according to the present invention
Embodiment, this prepares the method for lithium battery pole slice comprising steps of (1) is formed at least part surface of collector containing carbonaceous conductive
Layer；(2) the carbon containing conductive layer is activated；(3) electrode slurry is applied to by the carbon containing of the activation processing
Conductive layer obtains the lithium battery pole slice.
The method according to an embodiment of the present invention for preparing lithium battery pole slice, forms carbon containing conductive layer on a current collector first,
And by being activated to carbon containing conductive layer, the structure of organic molecule in carbon containing conductive layer can be changed, to lead carbon containing
The surface of electric layer forms a large amount of active function groups being suitable in conjunction with electrode slurry, and then applies on carbon containing conductive layer after activation
Add electrode slurry, the formed film of slurry and the cohesive force of carbon containing conductive interlayer are remarkably improved.In addition, by containing carbonaceous conductive
Layer is activated, and can also be improved the oxidisability of carbon containing conductive layer surface to a certain extent, be improved surface energy, increases
Surface roughness, to further be conducive to the stable bonding of the formed film of electrode slurry and carbon containing conductive interlayer, in production
Pole piece picking phenomenon significantly reduces.Lithium battery pole slice is prepared by this method as a result, pole piece cohesive force is being effectively improved, is improving
While pole piece reliability, reduce the use of conventional binders, conductive agent, enhances the electric conductivity of pole piece, be prepared
Lithium battery pole slice quality more preferably.
In addition, the method according to the above embodiment of the present invention for preparing lithium battery pole slice can also have following additional skill
Art feature:
In some embodiments of the invention, the content of organic matter is not less than 5wt% in the carbon containing conductive layer.As a result,
It can further improve the cohesive force of carbon containing conductive layer Yu the formed film of electrode slurry.
In some embodiments of the invention, described be activated includes sided corona treatment or ozone treatment.It as a result, can be into one
Step improves the cohesive force of carbon containing conductive layer and the formed film of electrode slurry.
In some embodiments of the invention, the sided corona treatment is carried out using corona processor, the corona processor
Power use scope be 5~30kW.
In some embodiments of the invention, the power use scope of the sided corona treatment is 9~10kW.
In some embodiments of the invention, the corona processor at a distance from the carbon containing conductive layer for 0.1~
15mm。
In some embodiments of the invention, the corona processor is 1~5mm at a distance from the carbon containing conductive layer.
In some embodiments of the invention, the time that the sided corona treatment carries out is 0.05s~30min.
In some embodiments of the invention, the time that the sided corona treatment carries out is 0.5s~5min.
In some embodiments of the invention, in the ozone treatment, ozone concentration is 0.1~100ppm.
In some embodiments of the invention, in the ozone treatment, ozone concentration is 10~40ppm.
In some embodiments of the invention, the time that the ozone treatment carries out is 0.05s~60min.
In some embodiments of the invention, the time that the ozone treatment carries out is 5s~30min.
In some embodiments of the invention, after the completion of the activation processing in 30min, by electrode slurry be applied to through
Cross the carbon containing conductive layer of the activation processing.It can further improve carbon containing conductive layer and the formed film of electrode slurry as a result,
Cohesive force.
In some embodiments of the invention, further comprise before the step (2): to the carbon containing conductive layer and described
At least one of collection liquid surface is dusted processing.It can further improve carbon containing conductive layer as a result, to be formed with electrode slurry
The cohesive force of film.
In some embodiments of the invention, the dust removal process includes in microwave ultrasound dedusting and blowing depression dust-removing
At least one.
In some embodiments of the invention, the electrode slurry is anode sizing agent or negative electrode slurry.
In another aspect of this invention, the invention proposes a kind of lithium battery pole slices.The lithium battery pole slice is by above-mentioned
What the method for preparing lithium battery pole slice of embodiment was prepared.Electrode active material and afflux in the lithium battery pole slice as a result,
Cohesive force between body is strong, high reliablity, more preferably relative to traditional lithium battery pole slice quality.
In another aspect of the invention, the invention proposes a kind of lithium batteries.The lithium battery includes the lithium of above-described embodiment
Battery pole piece.Cohesive force as a result, in pole piece used by the lithium battery between electrode active material and collector is strong, reliability
Height, the quality of the lithium battery is more preferably.
In some embodiments of the invention, the lithium battery pole slice is at least one of anode pole piece and cathode pole piece.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the method flow schematic diagram according to an embodiment of the invention for preparing lithium battery pole slice；
Fig. 2 is the method flow schematic diagram for preparing lithium battery pole slice of further embodiment according to the present invention；
Fig. 3 shows that the method according to the invention prepares the improvement of lithium battery pole slice compared with prior art.
Specific embodiment
The embodiment of the present invention is described below in detail.The embodiments described below is exemplary, and is only used for explaining this hair
It is bright, and be not considered as limiting the invention.Particular technique or condition are not specified in embodiment, according to text in the art
It offers described technology or conditions or is carried out according to product description.Reagents or instruments used without specified manufacturer,
For can be with conventional products that are commercially available.
In one aspect of the invention, the invention proposes a kind of methods for preparing lithium battery pole slice.It is according to the present invention
Embodiment, this prepares the method for lithium battery pole slice comprising steps of (1) is formed at least part surface of collector containing carbonaceous conductive
Layer；(2) carbon containing conductive layer is activated；(3) electrode slurry is applied to the carbon containing conductive layer by activation processing, obtained
To lithium battery pole slice.Lithium battery pole slice is prepared by this method as a result, pole piece cohesive force, raising pole piece are reliable effectively improving
While property, reduces the use of conventional binders, conductive agent, enhance the electric conductivity of pole piece, the lithium battery being prepared
Pole piece quality is more preferably.
It is carried out further below with reference to Fig. 1~2 pair method according to an embodiment of the present invention for preparing lithium battery pole slice detailed
Description.According to an embodiment of the invention, this method comprises:
S100: carbon containing conductive layer is formed
In the step, carbon containing conductive layer is formed at least part surface of collector.Lithium battery is prepared in of the invention
In the method for pole piece, specific type and material to collector are simultaneously not particularly limited, and those skilled in the art can be according to reality
Border is selected, such as aluminium foil, copper foil etc..In turn, can be prepared by means of the present invention anode pole piece or
Cathode pole piece.
Specific example according to the present invention, the carbon containing conductive layer can be by coating conductive layer slurry and being solidificated in collector
The mode on surface is formed.In some embodiments, above-mentioned conductive layer slurry include: 60~95 parts of carbon source, 5~40 parts of binder,
0~10 part and 450~1050 parts of solvent of dispersing agent.Wherein, carbon source may include selected from graphite, graphene, carbon nanotube, carbon gas
At least one of gel, carbon particle and carbon black；Binder can be Kynoar, styrene-butadiene emulsion or polyacrylic acid；Dispersion
Agent is polyvinylpyrrolidone or polyvinyl chloride；Solvent can be the common solvents such as N-Methyl pyrrolidone, deionized water.
According to an embodiment of the invention, the content of organic matter is not less than 5wt% in carbon containing conductive layer.In carbon containing conductive layer
Content of organics can be used to form the composition of the slurry of carbon containing conductive layer by adjusting to control.If having in carbon containing conductive layer
Machine object content is too low, then can not make to be formed enough be suitable for and electrode slurry in carbon containing conductive layer by subsequent activation processing
In conjunction with active function groups, and then cause viscous between the formed film of carbon containing conductive layer and electrode slurry by activation processing
Tie power decline.
S200: it is activated
In the step, carbon containing conductive layer is activated.Inventor sends out in the research to above-mentioned carbon containing conductive layer
Existing, the chemical property of the cohesive force of the carbon containing conductive layer and pole piece entirety, needs to control the carbon containing conductive layer in order to balance
Thickness is between 1~10 μm.However, when carbon containing conductive layer thickness is less than or equal to 1 μm, it is limited to the improvement of pole piece cohesive force,
Especially for cathode pole piece, dusting problems are still serious.And the increase of conductive layer thickness, and production cost can be brought to increase,
A series of problems, such as battery performance declines.In turn, for inventor by further investigation discovery, this may be carbon containing to be led due to existing
Caused by electric layer activity deficiency.By being activated to the carbon containing conductive layer, can be formed on the surface of carbon containing conductive layer
A large amount of active function groups being suitable in conjunction with electrode slurry, and then apply electrode slurry on carbon containing conductive layer after activation, it starches
Expect that formed film and the cohesive force of carbon containing conductive interlayer are remarkably improved.Meanwhile by being carried out at activation to carbon containing conductive layer
Reason can also improve the oxidisability of carbon containing conductive layer surface to a certain extent, improve surface energy, increase surface roughness,
It is bonded to further be conducive to the formed film of electrode slurry and carbon containing stablizing for conductive interlayer.
According to an embodiment of the invention, above-mentioned activation processing may include sided corona treatment or ozone treatment.Specifically, at corona
Reason, which refers to, carries out sided corona treatment to carbon containing conductive layer using the common corona processor in this field；Ozone treatment refers to ozone gas
Body is ejected to the surface of carbon containing conductive layer；In addition, ozone treatment can also be by setting the collector for being formed with carbon containing conductive layer
In confined space, and ozone progress is passed through into confined space.It according to some embodiments of the present invention, can be by electric discharge electricity
It is extremely upper to apply high-frequency and high-voltage, plasma ozone is generated on discharge electrode, and then make discharge electrode directly or indirectly with contain
Carbonaceous conductive layer contact, so as to so as to generate polar group (such as carbonyl, nitrogen-containing group on carbon containing conductive layer surface strand
Deng), greatly improve the tension and cohesive force of carbon containing conductive layer surface, and then be further conducive to the formed film of electrode slurry with
Carbon containing conduction interlayer stablizes bonding.
According to some embodiments of the present invention, above-mentioned sided corona treatment is carried out using corona processor, and corona processor
Power use scope can be 5~30kW.Thus, it is possible to effectively be activated to carbon containing conductive layer.Inventor is in an experiment
It was found that conventional technological parameter carries out sided corona treatment to carbon containing conductive layer in the prior art for use, it is easy to make carbon containing conductive layer
At adverse effect (such as breakdown surface, destroy profile pattern, to cause carbon containing conductive rotten etc.), this may be due to
Containing caused by a certain amount of organic matter and conductive material in carbon containing conductive layer.In turn, inventor is comprehensive by further investigation
Consider the activation effect, manufacturing cost and continuous production to carbon containing conductive layer, preferred embodiment in accordance with the present invention, above-mentioned electricity
In dizzy processing, the power use scope of corona processor is 9~10kW.It is living in carbon containing conductive layer Jing Guo sided corona treatment as a result,
The content of property functional group greatly improves, and the cohesive force of carbon containing conductive layer and the formed film of electrode slurry further increases.
According to some embodiments of the present invention, in sided corona treatment, corona processor can be at a distance from carbon containing conductive layer
For 0.1~15mm, it is preferred that distance is 1~5mm.By will be arranged between corona processor and carbon containing conductive layer it is special away from
From the efficiency of sided corona treatment both can be improved, sided corona treatment can also be avoided to destroy carbon containing conductive layer surface.It needs to illustrate
It is that distance here refers to corona processor discharge electrode at a distance from carbon containing conductive layer.
According to some embodiments of the present invention, the time that sided corona treatment carries out can be 0.05s~30min.Specifically, electric
Dizzy processing can carry out in production line, thus the processing time of single workpiece can be very short.Comprehensively consider sided corona treatment
Effect and production efficiency, the time that sided corona treatment carries out is preferably 0.5~5min.
According to some embodiments of the present invention, in above-mentioned ozone treatment, the concentration of ozone can be 0.1~100ppm.By
This, can effectively activate carbon containing conductive layer.Inventor has found in an experiment, use conventional technique in the prior art
Parameter carries out ozone treatment to carbon containing conductive layer, be easy to adversely affect carbon containing conductive layer (such as destroy profile pattern,
It is rotten etc. to cause carbon containing conductive), this may be due to containing a certain amount of organic matter and conduction material in carbon containing conductive layer
Expect described caused.In turn, inventor comprehensively considers the activation effect to carbon containing conductive layer, manufacturing cost by further investigation
And continuous production, preferred embodiment in accordance with the present invention, ozone concentration is 10~40ppm in above-mentioned ozone treatment.
According to some embodiments of the present invention, the time that ozone treatment carries out can be 0.05s~60min, thus, it is possible to
The content and processing for guaranteeing the active function groups in carbon containing conductive layer have the cohesive force of carbon containing organic layer to effectively improve.Comprehensively consider
Ozone treatment effect and production efficiency, the time that ozone treatment carries out is preferably 5s~30min.
According to an embodiment of the invention, in actual production, it can be real in the production line to the activation processing of carbon containing conductive layer
When complete online, in other words, the collector for being formed with carbon containing conductive layer can be directly entered subsequent activation treatment process, and
While still alive subsequent application electrode slurry process is directly entered after handling.According to the needs of different working conditions, by being activated
Carbon containing conductive layer can also carry out again subsequent handling with certain interval of time.Preferred embodiment in accordance with the present invention should activate
After the completion of processing in 30min, electrode slurry is applied to the carbon containing conductive layer by activation processing.Since active function groups are containing
Electrode slurry is applied to carbon containing conductive layer in 30min after the completion of activation processing by restricted lifetime existing for carbonaceous conductive layer surface,
It can further advantageously ensure that the high cohesive force of carbon containing conductive layer, guarantee the formed film of electrode slurry and carbon containing conductive interlayer
Stablize bonding.In addition, inventor has found under study for action, if directly collector is activated (such as by corona or smelly
Oxygen processing), since collector itself has very strong electric conductivity, the active function groups for activating generation can damage in a short period of time
It loses, be unfavorable for the control of production cost or guarantee the continuity of production.
S300: apply electrode slurry
In the step, electrode slurry is applied to the carbon containing conductive layer by activation processing, obtains lithium battery pole slice.Specifically
, electrode slurry can be applied on carbon containing conductive layer using mode well known to those skilled in the art, for example, can will be electric
Pole slurry is coated on carbon containing conductive layer, and by being formed by curing electrode active material film.
According to an embodiment of the invention, above-mentioned electrode slurry can be anode sizing agent or negative electrode slurry.In other words, this hair
It is bright the method that activation processing prepares battery pole piece is carried out to carbon containing conductive layer to be not only suitable for preparing anode pole piece, it is also applied for preparing
Cathode pole piece.Method of the invention is to the specific type of anode sizing agent and negative electrode slurry and is not particularly limited, can be using this
Field common anode sizing agent and negative electrode slurry, details are not described herein.
According to some embodiments of the present invention, electrode slurry can be applied with carbon containing conductive layer above-mentioned by existing volume production
Cloth machine is prepared, and corresponding activating treatment equipment only need to be added in existing production line, thus, method of the invention is very
It is easily applied in large-scale production.
With reference to Fig. 2, the method for preparing lithium battery pole slice of the invention be can further include:
S400: dust removal process
According to an embodiment of the invention, before S200, can at least one of carbon containing conductive layer and collection liquid surface into
Row dust removal process.According to some embodiments of the present invention, the collector foil of carbon containing conductive layer and its two sides is dusted, by
This, can effectively exclude influence of the impurity such as dust granule to carbon containing conductive layer and/or collection liquid surface, improve electrode slurry institute shape
At the bond effect of film.
According to an embodiment of the invention, the concrete mode of dust removal process is not particularly restricted, if can effectively by
The impurity particles such as the dust granule of carbon containing conductive layer and/or collection liquid surface remove, and those skilled in the art can basis
Actual needs is selected.Comprehensively consider the factors such as dust removing effects, continuous production, preferred embodiment in accordance with the present invention, on
Stating dust removal process may include at least one of the common microwave ultrasound dedusting in this field and blowing depression dust-removing.
In summary, the method according to an embodiment of the present invention for preparing lithium battery pole slice forms on a current collector contain first
Carbonaceous conductive layer, and carbon containing conductive layer is activated after dedusting, the structure of organic molecule in carbon containing conductive layer can be changed,
Containing to form a large amount of active function groups being suitable in conjunction with electrode slurry on the surface of carbon containing conductive layer, and then after activation
Apply electrode slurry on carbonaceous conductive layer, the formed film of slurry and the cohesive force of carbon containing conductive interlayer are remarkably improved.In addition, logical
It crosses and carbon containing conductive layer is activated, the oxidisability of carbon containing conductive layer surface can also be improved to a certain extent, improved
Surface energy, increase surface roughness, thus be further conducive to the formed film of electrode slurry with it is carbon containing conduction interlayer it is steady
Fixed to bond, pole piece picking phenomenon significantly reduces (as shown in Figure 3) in production.Lithium battery pole slice is prepared by this method as a result,
While effectively improving pole piece cohesive force, improve pole piece reliability, reduces the use of conventional binders, conductive agent, enhance
The electric conductivity of pole piece, the lithium battery pole slice quality being prepared is more preferably.
In another aspect of this invention, the invention proposes a kind of lithium battery pole slices.The lithium battery pole slice is by above-mentioned
What the method for preparing lithium battery pole slice of embodiment was prepared.Electrode active material and afflux in the lithium battery pole slice as a result,
Cohesive force between body is strong, high reliablity, more preferably relative to traditional lithium battery pole slice quality.
It should be noted that being equally applicable to described previously for feature and advantage described in the method for lithium battery pole slice are prepared
The lithium battery pole slice, this is no longer going to repeat them.
In another aspect of the invention, the invention proposes a kind of lithium batteries.The lithium battery includes the lithium of above-described embodiment
Battery pole piece.Cohesive force as a result, in pole piece used by the lithium battery between electrode active material and collector is strong, reliability
Height, the quality of the lithium battery is more preferably.
According to some embodiments of the present invention, above-mentioned lithium battery pole slice is at least one of anode pole piece and cathode pole piece.
In other words, the anode pole piece in lithium battery proposed by the invention and/or cathode pole piece are to prepare lithium electricity by above-described embodiment
What the method for pond pole piece was prepared.
It should be noted that the lithium battery include described previously for whole feature and advantage described in lithium battery pole slice,
This is no longer repeated one by one.
Below with reference to specific embodiment, present invention is described, it should be noted that these embodiments are only to describe
Property, without limiting the invention in any way.
Embodiment 1
Lithium battery cathode pole piece is prepared according to the following steps:
(1) carbon containing conductive layer is coated in copper foil surface, wherein carbon containing conductive layer is by including 60 parts of carbon black, butadiene-styrene rubber cream
35 parts of liquid, 5 parts of polyvinyl chloride and 400 parts of deionized water of slurry are coated at least part surface of copper foil and are formed by curing.
(2) microwave ultrasound processing or blowing the aspiration of negative pressure processing are carried out to the foil of carbon containing conductive layer and its two sides.
(3) carry out sided corona treatment to carbon containing conductive layer according to following condition: corona processor is 10kW, corona using power
Processing is 1mm at a distance from carbon containing conductive layer, and the sided corona treatment time is 0.5s.
(4) negative electrode slurry is coated in carbon containing conductive layer surface, and solidifies and obtains lithium battery cathode pole piece.
Embodiment 2
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, in step (3), corona
Processor is 5kW using power.
Embodiment 3
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, in step (3), corona
Processor is 20kW using power.
Embodiment 4
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, in step (3), corona
Processor is 30kW using power.
Embodiment 5
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, in step (3), corona
The processing time is 0.05s.
Embodiment 6
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, in step (3), corona
The processing time is 5s.
Embodiment 7
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, in step (3), corona
The processing time is 15min.
Embodiment 8
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, in step (3), corona
The processing time is 30min.
Embodiment 9
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, in step (3), corona
The processing time is 60min.
Embodiment 10
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, in step (3), corona
Processor is 3mm at a distance from carbon containing conductive layer.
Embodiment 11
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, in step (3), corona
Processor is 5mm at a distance from carbon containing conductive layer.
Embodiment 12
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, in step (3), corona
Processor is 15mm at a distance from carbon containing conductive layer.
Embodiment 13
Lithium battery cathode pole piece is prepared according to the following steps:
(1) carbon containing conductive layer is coated in copper foil surface, wherein carbon containing conductive layer is by including 60 parts of carbon black, butadiene-styrene rubber cream
35 parts of liquid, 5 parts of polyvinyl chloride and 400 parts of deionized water of slurry are coated at least part surface of copper foil and are formed by curing.
(2) microwave ultrasound processing or blowing the aspiration of negative pressure processing are carried out to the foil of carbon containing conductive layer and its two sides.
(3) ozone treatment is carried out to carbon containing conductive layer according to following condition: the copper foil for being formed with carbon containing conductive layer is placed in
In confined space, and maintaining the ozone concentration in the confined space is that 0.1ppm continues 60min.
(4) negative electrode slurry is coated in carbon containing conductive layer surface, and solidifies and obtains lithium battery cathode pole piece.
Embodiment 14
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 13, difference is, smelly in step (3)
Oxygen concentration is 10ppm, duration 30min.
Embodiment 15
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 13, difference is, smelly in step (3)
Oxygen concentration is 40ppm, duration 15min.
Embodiment 16
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 13, difference is, smelly in step (3)
Oxygen concentration is 100ppm, duration 5s.
Embodiment 17
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, in step (3), ozone
Concentration is 100ppm, duration 0.05s.
Embodiment 18
Lithium battery anode piece is prepared according to the following steps:
(1) carbon containing conductive layer is coated in aluminium foil surface, wherein carbon containing conductive layer is by including 60 parts of carbon black, Kynoar
(PVDF) 35 parts of powder, 5 parts of polyvinylpyrrolidone and 400 parts of N-Methyl pyrrolidone of slurry are coated at least the one of aluminium foil
Part of the surface is simultaneously formed by curing.
(2) microwave ultrasound processing or blowing the aspiration of negative pressure processing are carried out to the foil of carbon containing conductive layer and its two sides.
(3) carry out sided corona treatment to carbon containing conductive layer according to following condition: corona processor is 10kW, corona using power
Processing is 1mm at a distance from carbon containing conductive layer, and the sided corona treatment time is 0.5s.
(4) anode sizing agent is coated in carbon containing conductive layer surface, and solidifies and obtains lithium battery anode piece.
Comparative example 1
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, saves step (3), no
Negative electrode slurry is directly coated in carbon containing conductive layer surface, and solidifies and obtain lithium battery cathode pole piece by activated processing.
Comparative example 2
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, saves step (2), no
Through dust removal process, sided corona treatment directly is carried out to carbon containing conductive layer.
Comparative example 3
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, carbon containing in step (1)
Conductive layer is by being coated at least one of copper foil comprising 95 parts of carbon black, 5 parts of SBR emulsion and 900 parts of deionized water of slurry
Point surface is simultaneously formed by curing.
Comparative example 4
Lithium battery cathode pole piece is prepared according to method substantially the same manner as Example 1, difference is, after the completion of step (3),
It is spaced after 45min and negative electrode slurry is coated in carbon containing conductive layer surface again, and solidify and obtain lithium battery cathode pole piece.
Comparative example 5
Negative electrode slurry is applied directly to copper foil surface, and solidifies and obtains lithium battery cathode pole piece.
Test case
After the pole piece roll-in being prepared in embodiment 1~18, comparative example 1~5,180 ° of removings are carried out to cathode film
Test.Test result is shown in Table 1, and test result is cohesive force, unit Nm in table 1-1。
1 peel test results of table
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 |
| 30 | 20 | 25 | 22 | 28 | 30 |
| Embodiment 7 | Embodiment 8 | Embodiment 9 | Embodiment 10 | Embodiment 11 | Embodiment 12 |
| 29 | 29 | 24 | 30 | 24 | 16 |
| Embodiment 13 | Embodiment 14 | Embodiment 15 | Embodiment 16 | Embodiment 17 | Embodiment 18 |
| 28 | 26 | 27 | 25 | 26 | 41 |
| Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | |
| 8 | 15 | 18 | 9 | 3 |
Test result shows to prepare anode pole piece and cathode pole according to the method proposed by the present invention for preparing lithium battery pole slice
Piece can effectively improve the cohesive force of pole piece.Activation processing in method it can be seen from comparative example 1 is to pole piece cohesive force
It has a significant impact.Directly carbon containing conductive layer is activated without dust removal process it can be seen from comparative example 2, is unfavorable for carbon containing
The promotion of conductive layer cohesive force.The content of organic matter is too low in carbon containing conductive layer it can be seen from comparative example 3 (being lower than 5wt%),
The effect that activation processing promotes its cohesive force is unobvious.Interval time is too long after the completion of being activated it can be seen from comparative example 4
(being greater than 30min), it is unfavorable for the promotion of carbon containing conductive layer cohesive force.It is of the invention to containing carbonaceous conductive it can be seen from comparative example 5
The method that layer is activated can significantly improve pole piece cohesive force.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of method for preparing lithium battery pole slice, which is characterized in that the method for preparing lithium battery pole slice comprising steps of
(1) carbon containing conductive layer is formed at least part surface of collector；
(2) the carbon containing conductive layer is activated；
(3) electrode slurry is applied to the carbon containing conductive layer by the activation processing, obtains the lithium battery pole slice.
2. the method according to claim 1, wherein the content of organic matter is not less than in the carbon containing conductive layer
5wt%.
3. the method according to claim 1, wherein described be activated includes sided corona treatment or ozone treatment.
4. according to the method described in claim 3, it is characterized in that, the sided corona treatment using corona processor carry out, it is described
The use power bracket of corona processor is 5~30kW, it is preferred that using power bracket is 9~10kW；The corona processor
With at a distance from the carbon containing conductive layer be 0.1~15mm, it is preferred that distance be 1~5mm；The time that the sided corona treatment carries out
For 0.05s~30min, it is preferred that the time is 0.5s~5min.
5. according to the method described in claim 3, it is characterized in that, in the ozone treatment, ozone concentration is 0.1~
100ppm, it is preferred that ozone concentration is 10~40ppm；The time that the ozone treatment carries out is 0.05s~60min, preferably
, the time is 5s~30min.
6. the method according to claim 1, wherein after the completion of the activation processing in 30min, by electrode slurry
Material is applied to the carbon containing conductive layer by the activation processing.
7. the method according to claim 1, wherein further comprising before the step (2): carbon containing being led to described
At least one of electric layer and the collection liquid surface are dusted processing；
Optionally, the dust removal process includes at least one of microwave ultrasound dedusting and blowing depression dust-removing.
8. described in any item methods according to claim 1~7, which is characterized in that the electrode slurry be anode sizing agent or
Negative electrode slurry.
9. a kind of lithium battery pole slice, which is characterized in that the lithium battery pole slice is by according to any one of claims 1 to 8
What method was prepared.
10. a kind of lithium battery characterized by comprising lithium battery pole slice as claimed in claim 9；
Optionally, the lithium battery pole slice is at least one of anode pole piece and cathode pole piece.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113130973A (en) * | 2021-03-30 | 2021-07-16 | 合肥国轩高科动力能源有限公司 | Lithium ion battery, preparation method and battery pack |
| US20220328803A1 (en) * | 2021-04-09 | 2022-10-13 | Applied Materials, Inc. | Pretreatment and post-treatment of electrode surfaces |
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| CN101938010A (en) * | 2009-07-01 | 2011-01-05 | 江苏双登集团有限公司 | Manufacturing method of polymer lithium-ion power battery |
| CN103548190A (en) * | 2011-05-23 | 2014-01-29 | 株式会社钟化 | Conductive film, current collector using same, battery and bipolar battery |
| CN103547451A (en) * | 2011-05-23 | 2014-01-29 | 株式会社钟化 | Multilayer conductive film, current collector using same, battery and bipolar battery |
| JP2017059437A (en) * | 2015-09-17 | 2017-03-23 | トヨタ自動車株式会社 | Manufacturing method of lithium ion secondary battery negative electrode |
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| CN101938010A (en) * | 2009-07-01 | 2011-01-05 | 江苏双登集团有限公司 | Manufacturing method of polymer lithium-ion power battery |
| CN103548190A (en) * | 2011-05-23 | 2014-01-29 | 株式会社钟化 | Conductive film, current collector using same, battery and bipolar battery |
| CN103547451A (en) * | 2011-05-23 | 2014-01-29 | 株式会社钟化 | Multilayer conductive film, current collector using same, battery and bipolar battery |
| JP2017059437A (en) * | 2015-09-17 | 2017-03-23 | トヨタ自動車株式会社 | Manufacturing method of lithium ion secondary battery negative electrode |
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| CN113130973A (en) * | 2021-03-30 | 2021-07-16 | 合肥国轩高科动力能源有限公司 | Lithium ion battery, preparation method and battery pack |
| US20220328803A1 (en) * | 2021-04-09 | 2022-10-13 | Applied Materials, Inc. | Pretreatment and post-treatment of electrode surfaces |
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