CN106784857A - A kind of lithium ion battery water system primary coat collector and its preparation method and application - Google Patents
A kind of lithium ion battery water system primary coat collector and its preparation method and application Download PDFInfo
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- CN106784857A CN106784857A CN201710012108.6A CN201710012108A CN106784857A CN 106784857 A CN106784857 A CN 106784857A CN 201710012108 A CN201710012108 A CN 201710012108A CN 106784857 A CN106784857 A CN 106784857A
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- Prior art keywords
- water system
- primary coat
- collector
- system primary
- conductive carbon
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
- H01M4/662—Alloys
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
-
- 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
Abstract
The invention provides a kind of preparation method of lithium ion battery water system primary coat collector, comprise the following steps：Prepare water system primary coat slurry：Water system dispersant and water are first mixed, sheets of conductive carbon and the stirring of spherical conductive carbon are added afterwards, add water-based binder, obtain water system primary coat slurry；The water system primary coat slurry is coated in the collector substrate surface, a priming coat is formed after drying, obtain water system primary coat collector.The surface roughness of the water system primary coat collector is higher, the peel strength between water system primary coat collector and active matter can be improved, and improve contact resistance between the two, and then reduce the internal resistance of cell, improve the compacted density and energy density of battery, for battery power continuation of the journey provides possibility.
Description
Technical field
The present invention relates to the preparation method of lithium ion battery functional properties conductivity collector, and in particular to a kind of lithium ion battery
With water system primary coat collector and its preparation method and application.
Background technology
Typical electrochemical cell has the negative electrode and anode for participating in electrochemical reaction.It is manufacture electrode, can be by electrode
Active material (electroactive material) is coated on collector, its positive and negative pole material that can serve as battery.Protect
The electrical contact held between electrode active material and conductive current collector is most important for the effective operation of electrochemical cell.
It is known that the transition zone being coated between electrode active material and collector, referred to as " primer " or " primary coat
Layer ", can be bonded between electrode active material and collector, and provide the conductance between electrode active material and collector
It is logical, and then reduce the contact resistance between active material and collector.At present, primary coat slurry is had now to occur, but it is many existing
Having primer can not also improve the excellent bonds of electrode active material and collector while the good electrical contact of offer interlayer.
The content of the invention
In view of this, the invention provides a kind of lithium ion battery water system primary coat collector, collector can improved
And electrode active material between while good conductive ability, electrode active material can also be improved and be coated with water system primary coat slurry
Caking property on the collector (the water system primary coat collector for obtaining) of material, and then improve compacted density, the energy density of battery
Etc. performance.
In a first aspect, the invention provides a kind of preparation method of water system primary coat collector, comprising the following steps：
(1) water system dispersant and water are mixed, is stirred, obtain mixture A；
(2) sheets of conductive carbon and spherical conductive carbon are added in the mixture A, after stirring and be sanded straight
D50 to the sheets of conductive carbon and spherical conductive carbon is 20~90 μm, obtains mixture B；
(3) to water-based binder is added in the mixture B, stirring obtains lithium ion battery water system primary coat slurry, institute
State in water system primary coat slurry, the mass fraction of water system dispersant is 0.5-10%, and the mass fraction of sheets of conductive carbon is 5-25%,
The mass fraction of spherical conductive carbon is 5-50%, and the mass fraction of water-based binder is 2-10%；
(4) collector base material is taken, the water system primary coat slurry is coated in the collector substrate surface, formed after drying
One priming coat, obtains water system primary coat collector.
Preferably, the viscosity of the water system primary coat slurry is 0.05~8Pas.
Preferably, in the water system primary coat slurry, the mass fraction of water is 30-80%.More preferably 40-70%.
Preferably, in step (1), the time of the stirring is 0.5-4h hours.
Preferably, in step (2), the time of the stirring is 0.5-4h hours.
Preferably, in step (3), the speed of the stirring is 3000~5000r/min.
In the present invention, during primary coat slurry is prepared, while using sheets of conductive carbon and spherical conductive carbon as leading
Electric agent, wherein, sheets of conductive carbon can effectively reduce interface resistance, and spherical conductive carbon can effectively strengthen electric conductivity, increase
Strong roughness, can be by the interaction of sheet and spherical conductive carbon, and it (can be that sheet is led to be collectively forming conductive network structure
Electrical carbon forms conductive network framework, and spherical conductive carbon is interspersed between the aspect of sheets of conductive carbon, it is to avoid the group of sheets of conductive carbon
Gather, or spherical conductive carbon is well dispersed between sheets of conductive carbon molecule).The primary coat slurry is being applied to collector
When upper, beneficial to the raising of electric conductivity between collector and electrode active material, be more conducive to be formed large area with uneven
Rough surface priming coat, contribute to electrode active material adhesion on a current collector, and carry more electrode activity materials
Material, so as to improve the energy density of battery, reduces the internal resistance of cell.
Additionally, during primary coat slurry is prepared, first being mixed water system dispersant with water, conductive agent is added,
Water-based binder is eventually adding, can so avoid first adding the slurry viscosity caused by water-based binder to increase, added after influence
The dispersion of the sheet and spherical conductive carbon that enter, extends mixing time.
The mass fraction difference of major control sheets of conductive carbon and spherical conductive carbon in water system primary coat slurry in the present invention
Be 5-25%, 5-50%, and based on water system dispersant, binding agent, water synergy so that the roughness of the priming coat is closed
Suitable, space is suitable, is easy to electrode active material stabilization, carrying of adhesion amount high on the priming coat of water system primary coat collector.
Spherical conductive carbon should be controlled in certain limit with sheets of conductive carbon mass fraction in the slurry, if ball conductive carbon
Too much, very little, then spherical conductive carbon itself may form closs packing to sheets of conductive carbon in base coating surface, influence electrode activity material
Expect the adhesion amount on water system primary coat collector, and then influence the energy density of battery；If sheets of conductive carbon is too many, spherical conductive
Very little, then the overall structure void for being formed is too big for carbon, and not enough, electrode active material is in water system primary coat collection for the roughness of priming coat
Attachment on fluid is unstable.
Preferably, mass fraction of the sheets of conductive carbon in oil system primary coat slurry is 4-15%.
Preferably, mass fraction of the spherical conductive carbon in oil system primary coat slurry is 10-25%.More preferably
12-23%.
In the present invention, the spherical conductive carbon is (0.2-10) with the mass ratio of the sheets of conductive carbon：1.Preferably, institute
It is (1-5) that spherical conductive carbon is stated with the mass ratio of the sheets of conductive carbon：1.
In the step of the application (2), the sheets of conductive carbon and spherical conductive carbon conduct for being ground to D50 for 20~90 μm are used
The main component of the water system primary coat slurry is constituted, the conductive agent of such particle size range can be in the water system primary coat slurry
Preferably dispersion, the primary coat performance of slurry is more excellent, can avoid the thickness of the too big influence coating of particle size range, can also avoid
Particle diameter is too small so that the roughness of the priming coat of formation is inadequate.
Preferably, the sheets of conductive carbon is selected from the one kind or many in Graphene, crystalline flake graphite, expanded graphite and KS-6
Kind.
Preferably, the spherical conductive carbon is in the carbon black conductive agent (SP) such as Supper P, Ketjen black, acetylene black, 350G
One or more.
In the present invention, more than the Graphene or two-layer of the Graphene including individual layer and less than 100 layers of Multi-layer graphite
Alkene.The Graphene of the individual layer refers to the carbon molecule piece of 1 atomic layer with sp2 keys.Preferably, the Graphene is 2-10 layers
Multi-layer graphene.
Preferably, a diameter of 5~10 μm of the Graphene, thickness is 10~20nm.
In an embodiment of the present invention, the sheets of conductive carbon is Graphene, and the spherical conductive carbon is 350G.
In an embodiment of the present invention, the sheets of conductive carbon is KS-6, and the spherical conductive carbon is Ketjen black.
In an embodiment of the present invention, the sheets of conductive carbon is Graphene and expanded graphite, the spherical conductive carbon
It is acetylene black and Ketjen black.
In an embodiment of the present invention, the sheets of conductive carbon is crystalline flake graphite and KS-6, and the spherical conductive carbon is
Acetylene black and 350G.
Preferably, the water system dispersant is ethanol, lauryl sodium sulfate (SDS), neopelex
(SDBS), in octyl phenyl polyoxyethylene ether (triton x-100), polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG)
One or more.
In an embodiment of the present invention, the molecular weight of the PEG is 1-5 ten thousand.
Preferably, the water-based binder includes sodium carboxymethylcellulose (CMC), polyvinyl alcohol (being abbreviated as PVA) and LA
One or more in serial aqueous binders (such as LA133, LA132, LA135), but not limited to this.
It is further preferred that mass fraction of the water-based binder in water system primary coat slurry is 2-6%.More preferably
3-5%.
In an embodiment of the present invention, the molecular weight of the PVA is 5-30 ten thousand.
Preferably, in the water system primary coat slurry, also including surfactant, defoamer, the one kind or many in stabilizer
Kind.
Preferably, the thickness of the priming coat is 0.2-10 μm.More preferably 0.5-2 μm.
Preferably, the peel strength of the priming coat is 0.05-1N.The peel strength is using omnipotent mechanics machine
Measure, peeling force is started from scratch and gradually increase by this instrument, increase to used when separating coating and collector matrix
Power is the peeling force of the coating.
Preferably, the collector base material is Copper Foil or aluminium foil.More preferably aluminium foil.
The preparation method of the water system primary coat collector that first aspect present invention is provided, simple to operation, primary coat slurry
Preparation time it is short, be easy to get the primary coat slurry for stirring.
Second aspect, the invention provides a kind of water system primary coat collector, the water system primary coat collector is using the present invention
Method described in first aspect is obtained.Wherein, the water system primary coat collector includes collector base material and is formed in the afflux
Priming coat on body base material.Wherein, the priming coat is viscous including water system dispersant, sheets of conductive carbon, spherical conductive carbon and water system
Knot agent.
In the application, sheets of conductive carbon, spherical conductive carbon be dispersed in constitute priming coat slurry water system dispersant and
In water-based binder, the priming coat formed after drying has rough rough surface.
The water system primary coat collector that second aspect present invention is provided has rough rough surface, works as electrode activity thing
When matter is coated in the water system primary coat collection liquid surface, except ensureing between active material and water system primary coat collector with good
Outside conductive capability, the viscosity and peel strength that can also increase between consequent activities material and water system primary coat collector (are about carried
More than 50%) high.
The third aspect, the invention provides a kind of electrode plates, the battery pole piece includes water system primary coat collector and electricity
Pole active material layer, the water system primary coat collector includes collector base material and the primary coat being formed on the collector base material
Layer, is provided with the electrode active material layer on the priming coat.
Wherein, the electrode active material layer includes positive electrode active materials, conductive agent and solvent.The electrode active material
Can also be including binding agent etc. in layer.
Wherein, the electrode active material layer includes negative active core-shell material, conductive agent and solvent.The electrode active material
Can also be including binding agent etc. in layer.
The common positive electrode including LiFePO4, iron manganese phosphate for lithium, nickel cobalt lithium aluminate etc. of the positive electrode active materials.Institute
Negative active core-shell material is stated including graphite etc..
Fourth aspect, present invention also offers a kind of lithium ion battery, positive pole is coated on above-mentioned water system primary coat collector
Or negative electrode active material, by coating, film-making, fluid injection, chemical conversion, partial volume obtains lithium ion battery.
Collector base material is larger with the internal resistance of active material, influences the migration rate of lithium ion, and then influence lithium-ion electric
The performance in pond.Compared with simple collector base material, the water system primary coat collector that the present invention is provided, based on the priming coat
Effect, it is possible to reduce the electromigration resistance between collector base material and active material, the square resistance of battery pole piece can be made
Reduce by more than 85%, the AC impedance reduction by more than 40% of the half-cell to be formed can be made, make full battery it is inherent reduce by 30% with
On.
Importantly, the special surface structure of priming coat can substantially increase active matter in the water system primary coat collector
Caking property and peel strength (about improving more than 50%) between matter and water system primary coat collector, can also greatly increase active material
Loading level on water system primary coat collector, improves the compacted density of battery, increases the energy density of battery, is battery power
Continuation of the journey is provided may.
The water system primary coat collector that the present invention is provided, can make the compacting of battery (such as LiFePO4 is positive electrode) close
Spend from 2.2-2.3g/cm3Bring up to 2.4-2.6g/cm3, the energy density of battery is risen to 130- from 115-125wh/kg
140wh/kg。
Advantages of the present invention will be illustrated partly in the following description, and a part is apparent according to specification
, or can be known by the implementation of the embodiment of the present invention.
Brief description of the drawings
Fig. 1 is a kind of structural representation of water system primary coat collector that the embodiment of the present invention 1 is provided；
Fig. 2 is ESEM (SEM) photo of priming coat on gained water system primary coat collector in the embodiment of the present invention 1；
Fig. 3 is a kind of structural representation of battery positive pole piece that the embodiment of the present invention 1 is provided.
Specific embodiment
As described below is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as
Protection scope of the present invention.
Embodiment 1
A kind of preparation method of water system primary coat collector, comprises the following steps：
1. 60g PEG are added in the deionized water of 1400g, 30min is stirred in dispersion tank, be completely dissolved it；
2., to (spherical) the stirring 30min of 350G that 180g Graphenes (sheet) and 435g are added in above-mentioned dispersion tank, treat point
After dissipating uniformly, carry out being sanded 4-5 times using sand mill, until the granularity D50 of mixture is 20 μm, stop being sanded；
3. to the CMC that 80g is added in the dispersion tank of step 2, it is stirred, it is the water system of 4mPas or so to obtain viscosity
Primary coat slurry；
4. resulting water system primary coat slurry is coated in the surface of aluminum foil current collector base material using technique, after drying
The priming coat that thickness is 1 micron is formed, water system primary coat collector is obtained.
Fig. 1 is the structural representation of gained water system primary coat collector in the embodiment of the present invention 1.In Fig. 1,10 is Copper Foil afflux
Body base material, 20 is priming coat, and 20 and 10 being layered on 10 collectively form the water system primary coat collector.Additionally, the priming coat
Peel strength be 0.07N.
Fig. 2 is ESEM (SEM) photo of priming coat in the present embodiment, from fig. 2 it can be seen that concavo-convex in priming coat
Uneven, roughness is higher, and with certain space, can be easy to adhesion, the insertion of subsequent electrode active material.
Using 1：Positive active material is coated on the water system primary coat collector that the present embodiment 1 is obtained and (including takes 5g particle diameters
For in 0.1 micron of LiFePO4 (LFP), the deionized water of 3g, the conduction liquid of 7.8g be mixed to form positive active material), and
5min is dried prior to 100 DEG C, then 2min is dried at 120 DEG C, battery positive pole piece is obtained after cut-parts.The conduction liquid for using is CN-
Nanosecond science and technology limited company of 1N/CN-1F German sides.
Using 2：The making of half-cell：Positive active material is coated on the water system primary coat collector that the present embodiment 1 is obtained
(including in taking the deionized water of LFP, 3g that 5g particle diameters are 0.1 micron, the conduction liquid of 7.8g be mixed to form positive active material),
Drying, roll-in, punching obtains anode pole piece, and the positive plate that will be obtained is sticky on anode cover, and negative pole uses lithium piece, and is pressed into
Button cell, is obtained half-cell.
Using 3：The making of full battery：The negative plate that positive plate obtained above and graphite are constituted with and barrier film carry out layer
Folded and winding, obtains battery core, and barrier film is arranged between positive plate and negative plate, and battery core is loaded in the receiving space of housing, note
Enter electrolyte, lithium ion battery (as full battery, such as 18650 common batteries soft-package battery in other words) is obtained after sealing
Fig. 3 is the structural representation of gained battery positive pole piece in the embodiment of the present invention 1.In Fig. 3,10 is copper foil current collector
Base material, 20 is priming coat, and it is positive-active that 20 and 10 being layered on 10 collectively form the water system primary coat collector 100,30
Position.It can clearly be seen that active material can be substantially embedded into in the priming coat in water system primary coat collector from Fig. 3, and
By uneven, roughness priming coat higher, its secure adhesion in water system primary coat collector is realized, increase water system
Peel strength and stripping difficulty between primary coat collector and active material.
It is protrusion technique effect of the invention, by comparative example 1 below：Common copper foil current collector is taken, in its table
Face coats same positive active material, is made battery positive pole piece, and tests its performance, as a result as shown in table 1 below.
The performance comparison of the example 1 of the present invention of table 1 and comparative example 1
Wherein, in above-mentioned table 1, peeling force, square resistance, compacted density are directed to the test of electrode anode pole piece；Internal resistance,
AC impedance is directed to the test of half-cell, and energy density is directed to the test of battery.
By table 1, it is apparent that the priming coat that is formed of the water system primary coat slurry that provides of the present invention, can be well
Modification collector base material, obtains surface roughness water system primary coat collector higher, and the water system primary coat collector can improve water
It is the conductive capability between primary coat collector and electrode activity thing, viscosity between the two can also be provided, improves battery
Compacted density and energy density, for battery power continuation of the journey provides possibility.
It is protrusion technique effect of the invention, following 2 comparative examples is provided with also directed to embodiment 1：
Comparative example 2
A kind of preparation method of water system primary coat collector, comprises the following steps：
1. will:The PEG of 60g is added in the deionized water of 215g, and 30min is stirred in dispersion tank, is completely dissolved it；
2., to (spherical) the stirring 30min of 350G that 600g Graphenes (sheet) and 1200g are added in above-mentioned dispersion tank, treat point
After dissipating uniformly, carry out being sanded 4-5 times using sand mill, until the granularity D50 of mixture is 20 μm, stop being sanded；
3. to the CMC that 80g is added in the dispersion tank of step 2, it is stirred, obtains water system primary coat slurry；
4. resulting water system primary coat slurry is coated in the surface of aluminum foil current collector base material using technique, after drying
A priming coat is formed, water system primary coat collector is obtained.
Comparative example 3
A kind of preparation method of water system primary coat collector, comprises the following steps：
1. will:The PEG of 60g is added in the deionized water of 1855g, and 30min is stirred in dispersion tank, is completely dissolved it；
2., to (spherical) the stirring 30min of 350G for adding 75g Graphenes (sheet) and 85g in above-mentioned dispersion tank, wait to disperse
After uniform, carry out being sanded 4-5 times using sand mill, until the granularity D50 of mixture is 20 μm, stop being sanded；
3. to the CMC that 80g is added in the dispersion tank of step 2, it is stirred, obtains water system primary coat slurry；
4. resulting water system primary coat slurry is coated in the surface of aluminum foil current collector base material using technique, after drying
A priming coat is formed, water system primary coat collector is obtained.
Using method same as Example 1, water system primary coat collector obtained in comparative example 2,3 is respectively prepared electricity
Pond anode pole piece, half-cell, battery, and correlated performance is tested, it is as a result as shown in table 2 below：
The performance comparison of the example 1 of the present invention of table 2 and comparative example 2,3
| Performance | Comparative example 2 | Comparative example 3 | Example 1 |
| Peeling force (N) | 0.3821 | 0.2991 | 0.581 |
| Square resistance (Ω) | 10 | 21 | 0.103 |
| Internal resistance (m Ω) | 21 | 37,6 | 9 |
| AC impedance (1000Hz) (Ω) | 14.6 | 25 | 9.27 |
| Compacted density (g/cm3) | 2.32 | 2.28 | 2.32 |
| Energy density (wh/kg) | 121 | 118 | 132 |
In embodiment 1, the mass fraction of sheets of conductive carbon is 8.35%, and the mass fraction of spherical conductive carbon is 20%, and
In comparative example 2, the mass fraction of sheets of conductive carbon is 27.8%, and the mass fraction of spherical conductive carbon is 55.6%, comparative example 3
In, the mass fraction of sheets of conductive carbon is 3.4%, and the mass fraction of spherical conductive carbon is 4%.
From upper table 2, when in water system primary coat slurry, when the mass fraction of sheets of conductive carbon is beyond 25% or less than 5%,
The peeling force of gained priming coat is relatively low when the mass fraction of spherical conductive carbon is beyond 50% or less than 5%, the pressure of battery pole piece
Real density is relatively low, and in this explanation water system primary coat slurry, sheets of conductive carbon and spherical conductive carbon should be controlled in certain content
Scope, just may be such that the properties of gained water system primary coat collector are more superior.
Embodiment 2
A kind of preparation method of water system primary coat collector, comprises the following steps：
1. the triton x-100 of 72g is added in the deionized water of 1485g, 60min is stirred in dispersion tank, make its complete
CL；
2., to (spherical) the stirring 2h of KS-6 (sheet) and 500g Ketjen blacks of addition and 115g in above-mentioned dispersion tank, wait to disperse
After uniform, carry out being sanded 4-5 times using sand mill, until the granularity D50 of mixture is 20~90 μm, stop being sanded；
3. to the LA132 that 90g is added in the dispersion tank of step 2, it is stirred, it is the water of 3mPas or so to obtain viscosity
It is primary coat slurry；
4. resulting water system primary coat slurry is coated in the surface of copper foil current collector base material using technique, after drying
A priming coat is formed, water system primary coat collector is obtained.
Positive active material is coated on the priming coat of the water system primary coat collector that the present embodiment 2 is obtained, and (including particle diameter is
0.2 micron of LFP, distilled water also have the mixed slurry that conduction liquid is constituted), obtain battery positive pole piece after drying.
Embodiment 3
A kind of preparation method of water system primary coat collector, comprises the following steps：
1. the polyvinylpyrrolidone PVP of 65g is added in the deionized water of 1480g, 45min is stirred in dispersion tank,
It is completely dissolved it；
2., to (spherical) the stirring 2h of the acetylene black of crystalline flake graphite (sheet) and 350g that 250g is added in above-mentioned dispersion tank, treat
After being uniformly dispersed, carry out being sanded 4-5 times using sand mill, until the granularity D50 of mixture is 20~90 μm, stop sand
Mill；
3. to the water-based binder LA133 that 70g is added in the dispersion tank of step 2, it is stirred, obtains viscosity for 8Pas
The water system primary coat slurry of left and right；
4. resulting water system primary coat slurry is coated in the surface of copper foil current collector base material using technique, after drying
A priming coat is formed, water system primary coat collector is obtained.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of lithium ion battery preparation method of water system primary coat collector, it is characterised in that comprise the following steps：
(1) water system dispersant and water are mixed, is stirred, obtain mixture A；
(2) sheets of conductive carbon and spherical conductive carbon are added in the mixture A, carry out being sanded after stirring until described
The D50 of sheets of conductive carbon and spherical conductive carbon is 20~90 μm, obtains mixture B；
(3) to water-based binder is added in the mixture B, stirring obtains lithium ion battery water system primary coat slurry, the water
It is that the mass fraction of water system dispersant is 0.5-10%, and the mass fraction of sheets of conductive carbon is 5-25%, spherical in primary coat slurry
The mass fraction of conductive carbon is 5-50%, and the mass fraction of water-based binder is 2-10%；
(4) collector base material is taken, the water system primary coat slurry is coated in the collector substrate surface, a bottom is formed after drying
Coating, obtains water system primary coat collector.
2. preparation method as claimed in claim 1, it is characterised in that the viscosity of the water system primary coat slurry is 0.05~
8Pa·s。
3. preparation method as claimed in claim 1, it is characterised in that the sheets of conductive carbon be selected from Graphene, crystalline flake graphite,
One or more in expanded graphite and KS-6.
4. preparation method as claimed in claim 1, it is characterised in that the spherical conductive carbon is Supper P, Ketjen black, second
One or more in acetylene black and 350G.
5. preparation method as claimed in claim 1, it is characterised in that the matter of the sheets of conductive carbon and the spherical conductive carbon
Amount is than being 1：(0.5-8).
6. preparation method as claimed in claim 1, it is characterised in that the thickness of the priming coat is 0.2-10 μm.
7. preparation method as claimed in claim 1, it is characterised in that the peel strength of the priming coat is 0.05-1N.
8. a kind of water system primary coat collector, it is characterised in that the water system primary coat collector is using such as claim any one of 1-7
Described method is obtained, and the water system primary coat collector includes collector base material and the primary coat being formed on the collector base material
Layer.
9. a kind of electrode plates, it is characterised in that including water system primary coat collector as claimed in claim 8 and electrode activity thing
Matter layer, the electrode active material is arranged on the priming coat of the water system primary coat collector.
10. a kind of lithium ion battery, it is characterised in that including electrode plates as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710012108.6A CN106784857B (en) | 2017-01-06 | 2017-01-06 | Water-based undercoat current collector for lithium ion battery and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710012108.6A CN106784857B (en) | 2017-01-06 | 2017-01-06 | Water-based undercoat current collector for lithium ion battery and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN106784857A true CN106784857A (en) | 2017-05-31 |
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| CN108365227A (en) * | 2018-04-20 | 2018-08-03 | 福建猛狮新能源科技有限公司 | A kind of various dimensions conduction composite current collector and its manufacturing method |
| CN108550779A (en) * | 2018-03-05 | 2018-09-18 | 湖北大学 | A kind of production method of the aquo-lithium ion battery electrode with high stability |
| CN109888295A (en) * | 2019-02-28 | 2019-06-14 | 合肥国轩高科动力能源有限公司 | A kind of affluxion body in lithium ion batteries coating paste, collector and preparation method thereof |
| CN111477848A (en) * | 2020-04-13 | 2020-07-31 | 江苏中兴派能电池有限公司 | Electrode and battery prepared from cathode water system conductive slurry |
| CN111566849A (en) * | 2018-02-05 | 2020-08-21 | 富士胶片株式会社 | Electrode sheet for all-solid-state secondary battery, electrode sheet for all-solid-state secondary battery, and method for manufacturing all-solid-state secondary battery |
| CN111916748A (en) * | 2020-08-14 | 2020-11-10 | 张超 | Spherical nano graphene conductive paste |
| CN113745511A (en) * | 2020-05-29 | 2021-12-03 | 广州汽车集团股份有限公司 | Conductive slurry, preparation method of conductive slurry, negative current collector, negative plate, lithium ion battery cell, lithium ion battery pack and application of negative current collector, negative plate, lithium ion battery cell and lithium ion battery pack |
| EP4044276A4 (en) * | 2020-09-07 | 2023-08-02 | LG Energy Solution, Ltd. | Secondary battery electrode and method for manufacturing secondary battery electrode |
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| CN107492665A (en) * | 2017-08-10 | 2017-12-19 | 重庆鲁岳新能源科技有限公司 | A kind of novel graphite alkene positive electrode piece of lithium-ion power battery and preparation method thereof |
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| CN109888295A (en) * | 2019-02-28 | 2019-06-14 | 合肥国轩高科动力能源有限公司 | A kind of affluxion body in lithium ion batteries coating paste, collector and preparation method thereof |
| CN111477848A (en) * | 2020-04-13 | 2020-07-31 | 江苏中兴派能电池有限公司 | Electrode and battery prepared from cathode water system conductive slurry |
| CN113745511A (en) * | 2020-05-29 | 2021-12-03 | 广州汽车集团股份有限公司 | Conductive slurry, preparation method of conductive slurry, negative current collector, negative plate, lithium ion battery cell, lithium ion battery pack and application of negative current collector, negative plate, lithium ion battery cell and lithium ion battery pack |
| CN111916748A (en) * | 2020-08-14 | 2020-11-10 | 张超 | Spherical nano graphene conductive paste |
| EP4044276A4 (en) * | 2020-09-07 | 2023-08-02 | LG Energy Solution, Ltd. | Secondary battery electrode and method for manufacturing secondary battery electrode |
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