CN106450156A - Electrode plate and manufacturing method thereof - Google Patents
Electrode plate and manufacturing method thereof Download PDFInfo
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- CN106450156A CN106450156A CN201610859570.5A CN201610859570A CN106450156A CN 106450156 A CN106450156 A CN 106450156A CN 201610859570 A CN201610859570 A CN 201610859570A CN 106450156 A CN106450156 A CN 106450156A
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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
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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
- 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
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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
- H01M4/13—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
Abstract
The invention belongs to the technical field of lithium-ion batteries, and particularly relates to an electrode plate and a manufacturing method thereof. The electrode plate comprises a current collector, an electrode film and a conductive layer coating the part between the current collector and the electrode film, wherein the conductive layer comprises a conductive agent and a binder; and the surface density of the electrode film is greater than or equal to 20mg/cm<2>. The conductive layer is arranged between the current collector and the electrode film, so that the conductivity and the bonding effect between the current collector and the electrode film are effectively strengthened; the surface density of the electrode film is over 20mg/cm<2>; and relatively high power density can still be kept. Therefore, the problem that the power density of the battery is greatly reduced due to improvement of the surface density of the electrode film in the prior art is effectively solved. Furthermore, compared with an existing multi-stage discontinuous production procedure, the manufacturing method of the electrode plate has the advantages that the process is simple, production is continuous, operation is simple and convenient, the production procedure can be effectively simplified, the production cycle is accelerated and the production efficiency is improved.
Description
Technical field
The invention belongs to technical field of lithium ion, more particularly to a kind of electrode slice and preparation method thereof.
Background technology
Lithium ion battery has become by the advantage such as high-energy-density, high working voltage, long circulation life, safety non-pollution
For the secondary cell of main flow in the market, on the products such as smart mobile phone, panel computer, Intelligent worn device, all adopt substantially
With lithium ion battery as power supply.But with intelligent portable mobile device integrated level be continuously increased and mobile device day by day
Tend to miniaturization, lightening development trend so as to the requirement more and more higher to battery energy density.
In order to lift the energy density of lithium ion battery further, widespread practice is to reduce inert matter in the industry at present
Shared proportion.Specific practice includes following two：First, reduce the unit volume of inert matter itself.For example：Work as precursor
Product energy density is 650Wh/L or gravimetric energy density is the polymer Li-ion battery of 230Wh/kg, the barrier film thickness which uses
Degree has had been reduced to 10～12 μm；And the Copper Foil of the aluminium foil as plus plate current-collecting body and negative current collector is reduced to respectively
10～12 μm and 6～8 μm.Second, reduce the consumption of inert matter.For example：Current volume energy density be 700Wh/L or
Gravimetric energy density is the polymer Li-ion battery of 250Wh/kg, inert matter in its both positive and negative polarity diaphragm (including conductive agent,
Binding agent, other nonactive functional additives) shared by proportion had been reduced within 2%；And its positive pole diaphragm is in collector
On coating surface density reached 20mg/cm2.
However, the way of the energy density of above two raising at present all encounters bottleneck.The bottleneck of the first way is,
Collector and barrier film its intensity thinner is weaker, causes the technique in battery manufacturing process and control cost increase.Second way
Bottleneck be, with binding agent and conductive agent minimizing and apply surface density increase so that between diaphragm and collector
Cementability and ionic conductivity all declined, simultaneously because ionic conductivity is die-offed, necessarily cause the internal resistance of cell to increase,
So that the power density of battery reduces.
Although additionally, first collector applied electrocondution slurry, dry again at present, and the primary coat in this, as composite collector
Scheme improves the mechanical attachment performance between diaphragm and collector to a certain extent, but its electrode slice for being brought is produced not
Continuously, the production cycle is long, energy consumption is wasted, cost is also urgently to be resolved hurrily the problems such as increase.
In view of this, it is necessory to provide a kind of electrode slice and preparation method thereof, to realize lifting battery energy density
While keeping higher cell power density.
Content of the invention
It is an object of the invention to：For the deficiencies in the prior art, and a kind of electrode slice is provided, to solve existing electrode slice
With the increase of electrode diaphragm surface density, and the problem that ionic conductivity and cell power density reduce.
To achieve these goals, the present invention adopts solution below：
A kind of electrode slice, including collector, electrode diaphragm and the conductive layer being coated between collector and electrode diaphragm,
The conductive layer includes conductive agent and binding agent, the surface density >=20mg/cm of the electrode diaphragm2.
Preferably, the conductive agent include conductive carbon black, electrically conductive graphite, acetylene black, Ketjen black, carbon fiber, CNT,
At least one in carbon nanocoils and Graphene.Above-mentioned conductive agent be respectively provided with excellent lead Electronic Performance, electricity can be effectively improved
The electrical conductance of pole piece.
Preferably, the binding agent include sodium carboxymethyl cellulose, politef, butadiene-styrene rubber, Kynoar and
At least one in polyimides.
Preferably, the surface density >=50mg/cm of the electrode diaphragm2；More preferably >=100mg/cm2.
Preferably, the thickness of the conductive layer is 0.1～10 μm；More preferably 1～3 μm.Conductive layer is too thick to reduce electricity
The volume energy density of pole piece；Conductive layer is too thin not to reach raising electrode slice electric conductivity, and then improves the purpose of the power of battery.
Preferably, the mass ratio of the conductive agent and the binding agent is 1.5:1～19:1, more preferably 5:1～12:1.
Electric conductivity and the caking property of conductive layer can effectively ensure that within the range；If consumption of binder is excessive, conductive agent consumption is too small,
The internal resistance of battery can be caused to increase, reduce active substance accounting, so as to cause battery capacity and power density to reduce；If binding agent
Consumption is too small, and conductive agent consumption is excessive, the bond effect of conductive layer can be caused to be deteriorated, be susceptible to dry linting, obscission.
Preferably, the conductive layer also includes at least one in ceramics, additive and electrode active material；The pottery
Porcelain powder is at least one in carborundum, aluminium oxide, silicon oxide, zirconium oxide, calcium oxide, zinc oxide, magnesium oxide and titanium oxide；Institute
State at least one that additive is in solid electrolyte, plasticizer and ionic liquid.
Preferably, the collector is Copper Foil or aluminium foil.When electrode slice is for positive plate, collector elects aluminium foil as；When
When electrode slice is negative plate, collector elects Copper Foil as.
Preferably, the electrode diaphragm includes electrode active material, binding agent and conductive agent.When electrode diaphragm is cathode film
When piece, electrode active material is lithium and cobalt oxides, lithium nickel oxide, lithium manganese oxide, Li, Ni, Mn oxide, lithium nickel cobalt manganese
One or more in thing, lithium nickel cobalt aluminum oxide and LiFePO4；When electrode diaphragm is for cathode membrane, electrode active material
For one or more in soft carbon, hard carbon, Delanium, native graphite, silicon, silicon oxide compound, silicon-carbon complex and lithium titanate.
Binding agent is a kind of or many in sodium carboxymethyl cellulose, politef, butadiene-styrene rubber, Kynoar and polyimides
Kind.Conductive agent is electrically conductive graphite, acetylene black, Ketjen black, carbon fiber, CNT, one kind of carbon nanocoils and Graphene kind or
Multiple.
The beneficial effects of the present invention is：Compared to prior art, the present invention passes through between collector and electrode diaphragm
Conductive layer is set, effectively strengthens the electric conductivity between collector and electrode diaphragm and bond effect so that electrode film is unilateral
Density reaches 20mg/cm2More than, can still keep higher power density；Therefore, the present invention efficiently solves prior art
The difficult problem that the middle cell power density brought because of the raising of electrode diaphragm surface density declines to a great extent.
Another object of the present invention is to：A kind of manufacture method of above-mentioned electrode slice is provided, the manufacture method includes following
Step：
(1) in collection liquid surface, electrocondution slurry is coated by way of intaglio printing or dip-coating, conductive after oven for drying
Slurry is formed as conductive layer；
(2) and then in the electrode coated slurry of conductive layer surface by way of extrusion coated or transfer coated, baking oven dries
Dry rear electrode slurry is formed as electrode diaphragm, that is, obtain described electrode slice.
Wherein, in step (1), oven temperature is 60～100 DEG C；In step (2), oven temperature is 80～120 DEG C.
Compared to existing multisection type Discontinuous manufacture operation, the manufacture method process is simple of the electrode slice of the present invention, production
Continuously, and easy to operate, can effectively simplify production process, reduce production cost, accelerate production cycle, improve production efficiency.
Description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is one of SEM figure of positive plate in comparative example of the present invention 3.
Fig. 3 is two of the SEM figure of positive plate in comparative example of the present invention 3.
In figure：1- collector；2- conductive layer；3- electrode diaphragm.
Specific embodiment
As shown in figure 1, a kind of electrode slice, including collector 1, electrode diaphragm 3 and collector 1 and electrode diaphragm is coated in
Conductive layer 2 between 3, conductive layer 2 includes that the mass ratio of conductive agent and binding agent, conductive agent and binding agent is 1.5:1～19:1；
The thickness of conductive layer 2 is 0.1～10 μm；Surface density >=the 20mg/cm of electrode diaphragm 32；
Wherein, conductive agent includes conductive carbon black, electrically conductive graphite, acetylene black, Ketjen black, carbon fiber, CNT, carbon nanometer
At least one in line and Graphene；Binding agent includes sodium carboxymethyl cellulose, politef, butadiene-styrene rubber, polyvinylidene fluoride
At least one in alkene and polyimides.
Below in conjunction with specific embodiment, the present invention and its advantage are described in further detail.
Embodiment 1
The preparation of positive plate：By electrically conductive graphite and butadiene-styrene rubber in mass ratio 10:1 mixing, using N-Methyl pyrrolidone
Solvent being made, finely dispersed electrocondution slurry is obtained through high-speed stirred, is then coated in aluminium foil surface by way of intaglio printing
Electrocondution slurry, after 80 DEG C of oven for drying, electrocondution slurry is formed as conductive layer 2, and the thickness of conductive layer 2 is 5 μm；Will
The conductive black of the nickle cobalt lithium manganate of 95wt%, the Kynoar of 2.5wt% and 2.5wt% is uniformly mixed to form positive pole slurry
Material, then in 2 surface-coated anode sizing agent of conductive layer by way of extrusion coated, positive pole slurry after 100 DEG C of oven for drying
Material is formed as positive pole diaphragm, and the surface density of positive pole diaphragm is 50mg/cm2.
The preparation of negative plate：By conductive carbon black and sodium carboxymethyl cellulose in mass ratio 1.5:1 mixing, using N- methyl pyrrole
Pyrrolidone makees solvent, obtains finely dispersed electrocondution slurry through high-speed stirred, is led in copper foil surface coating by way of dip-coating
Plasma-based material, after 60 DEG C of oven for drying, electrocondution slurry is formed as conductive layer 2, and the thickness of conductive layer 2 is 5 μm；By 96wt%
Carborundum/Delanium composite, the sodium carboxymethyl cellulose of 1.5wt%, the CNT of 1wt%, the fourth of 1.5wt%
Benzene rubber is uniformly mixed to form cathode size, then by way of transfer coated in 2 surface-coated cathode size of conductive layer,
After 80 DEG C of oven for drying, cathode size is formed as cathode membrane, and the surface density of cathode membrane is 26mg/cm2.
The preparation of lithium ion battery：The isolating membrane of lithium ion battery is 10 μm of polyethylene film, and electrolyte is adopted containing 1M
The electrolyte of lithium hexafluoro phosphate, solvent is 1 using volume ratio:1:1 ethylene carbonate/dimethyl carbonate/1,2-PD carbon
The mixed solvent of acid esters.
Naked battery core is formed after the above-mentioned positive plate for preparing, isolating membrane, negative plate are stacked gradually, through encapsulation, note
The operations such as liquid, chemical conversion, make stack type lithium ion battery or coiled lithium ion battery.
Embodiment 2
As different from Example 1, the preparation of positive plate：By acetylene black and politef in mass ratio 15:1 mixing,
Solvent is made using N-Methyl pyrrolidone, finely dispersed electrocondution slurry is obtained through high-speed stirred, then by intaglio printing
Mode coats electrocondution slurry in aluminium foil surface, and after 70 DEG C of oven for drying, electrocondution slurry is formed as conductive layer 2, and conductive layer 2
Thickness be 1 μm；The conductive black of the nickle cobalt lithium manganate of 97wt%, the Kynoar of 2wt% and 1wt% is uniformly mixed shape
Become anode sizing agent, then in 2 surface-coated anode sizing agent of conductive layer by way of extrusion coated, after 90 DEG C of oven for drying
Anode sizing agent is formed as positive pole diaphragm, and the surface density of positive pole diaphragm is 20mg/cm2.
Remaining repeats no more here with embodiment 1.
Embodiment 3
As different from Example 1, the preparation of positive plate：By Graphene and politef in mass ratio 19:1 mixing,
Solvent is made using N-Methyl pyrrolidone, finely dispersed electrocondution slurry is obtained through high-speed stirred, then by intaglio printing
Mode coats electrocondution slurry in aluminium foil surface, and after 90 DEG C of oven for drying, electrocondution slurry is formed as conductive layer 2, and conductive layer 2
Thickness be 3 μm；The carbon nanocoils of the nickle cobalt lithium manganate of 96wt%, the Kynoar of 2wt% and 2wt% are uniformly mixed shape
Become anode sizing agent, then in 2 surface-coated anode sizing agent of conductive layer by way of extrusion coated, in 120 DEG C of oven for drying
Anode sizing agent is formed as positive pole diaphragm afterwards, and the surface density of positive pole diaphragm is 80mg/cm2.
Remaining repeats no more here with embodiment 1.
Embodiment 4
As different from Example 1, the preparation of positive plate：By carbon fiber and polyimides in mass ratio 5:1 mixing, uses
N-Methyl pyrrolidone makees solvent, obtains finely dispersed electrocondution slurry through high-speed stirred, then by way of intaglio printing
Electrocondution slurry is coated in aluminium foil surface, electrocondution slurry is formed as conductive layer 2, and the thickness of conductive layer 2 after 80 DEG C of oven for drying
Spend for 0.1 μm；The conductive black of the nickle cobalt lithium manganate of 96wt%, the Kynoar of 2wt% and 2wt% is uniformly mixed to form
Anode sizing agent, then in 2 surface-coated anode sizing agent of conductive layer by way of extrusion coated, after 110 DEG C of oven for drying
Anode sizing agent is formed as positive pole diaphragm, and the surface density of positive pole diaphragm is 30mg/cm2.
Remaining repeats no more here with embodiment 1.
Embodiment 5
As different from Example 1, the preparation of positive plate：Acetylene black, Ketjen black, Graphene and Kynoar are pressed matter
Amount compares 3:3:3:1 mixing, makees solvent using N-Methyl pyrrolidone, obtains finely dispersed electrocondution slurry through high-speed stirred, so
In aluminium foil surface, electrocondution slurry is coated afterwards by way of intaglio printing, after 85 DEG C of oven for drying, electrocondution slurry is formed as leading
Electric layer 2, and the thickness of conductive layer 2 is 0.8 μm；By the nickle cobalt lithium manganate of 96wt%, the Kynoar of 2wt% and 2wt%
Conductive black is uniformly mixed to form anode sizing agent, then in 2 surface-coated anode sizing agent of conductive layer by way of extrusion coated,
After 100 DEG C of oven for drying, anode sizing agent is formed as positive pole diaphragm, and the surface density of positive pole diaphragm is 70mg/cm2.
Remaining repeats no more here with embodiment 1.
Embodiment 6
As different from Example 1, the preparation of negative plate：By carbon nanocoils and sodium carboxymethyl cellulose in mass ratio 3:1
Mixing, makees solvent using N-Methyl pyrrolidone, obtains finely dispersed electrocondution slurry through high-speed stirred, by way of dip-coating
Electrocondution slurry is coated in copper foil surface, electrocondution slurry is formed as conductive layer 2, and the thickness of conductive layer 2 after 100 DEG C of oven for drying
Spend for 8 μm；By the Delanium of 95wt%, the sodium carboxymethyl cellulose of 1.5wt%, the conductive black of 1.5wt%, 2wt%
Butadiene-styrene rubber is uniformly mixed to form cathode size, then in 2 surface-coated cathode size of conductive layer by way of transfer coated,
After 120 DEG C of oven for drying, cathode size is formed as cathode membrane, and the surface density of cathode membrane is 60mg/cm2.
Remaining repeats no more here with embodiment 1.
Embodiment 7
As different from Example 1, the preparation of negative plate：By CNT and sodium carboxymethyl cellulose in mass ratio 12:1
Mixing, makees solvent using N-Methyl pyrrolidone, obtains finely dispersed electrocondution slurry through high-speed stirred, by way of dip-coating
Electrocondution slurry is coated in copper foil surface, electrocondution slurry is formed as conductive layer 2, and the thickness of conductive layer 2 after 95 DEG C of oven for drying
Spend for 10 μm；By the Delanium of 95wt%, the sodium carboxymethyl cellulose of 1.5wt%, the conductive black of 1.5wt%, 2wt%
Butadiene-styrene rubber is uniformly mixed to form cathode size, then in 2 surface-coated cathode size of conductive layer by way of transfer coated,
After 115 DEG C of oven for drying, cathode size is formed as cathode membrane, and the surface density of cathode membrane is 25mg/cm2.
Remaining repeats no more here with embodiment 1.
Embodiment 8
As different from Example 1, the preparation of negative plate：By CNT, carbon nanocoils, Graphene and carboxymethyl cellulose
Plain sodium in mass ratio 5:5:5:1 mixing, makees solvent using N-Methyl pyrrolidone, obtains finely dispersed conduction through high-speed stirred
Slurry, coats electrocondution slurry in copper foil surface by way of dip-coating, and after 80 DEG C of oven for drying, electrocondution slurry is formed as leading
Electric layer 2, and the thickness of conductive layer 2 is 5 μm；By the Delanium of 95wt%, the sodium carboxymethyl cellulose of 1.5wt%, 1.5wt%
Conductive black, the butadiene-styrene rubber of 2wt% be uniformly mixed to form cathode size, then in conductive layer by way of transfer coated
2 surface-coated cathode sizes, after 100 DEG C of oven for drying, cathode size is formed as cathode membrane, and the face of cathode membrane is close
Spend for 30mg/cm2.
Remaining repeats no more here with embodiment 1.
Embodiment 9
As different from Example 1, the preparation of negative plate：By electrically conductive graphite, acetylene black, Kynoar and butadiene-styrene rubber
In mass ratio 8:8:0.5:0.5 mixing, makees solvent using N-Methyl pyrrolidone, obtains finely dispersed conduction through high-speed stirred
Slurry, coats electrocondution slurry in copper foil surface by way of dip-coating, and after 70 DEG C of oven for drying, electrocondution slurry is formed as leading
Electric layer 2, and the thickness of conductive layer 2 is 4 μm；By the Delanium of 95wt%, the sodium carboxymethyl cellulose of 1.5wt%, 1.5wt%
Conductive black, the butadiene-styrene rubber of 2wt% be uniformly mixed to form cathode size, then in conductive layer by way of transfer coated
2 surface-coated cathode sizes, after 90 DEG C of oven for drying, cathode size is formed as cathode membrane, and the surface density of cathode membrane
For 35mg/cm2.
Remaining repeats no more here with embodiment 1.
Embodiment 10
As different from Example 1, the preparation of negative plate：By CNT, carbon nanocoils, politef and carboxymethyl
Sodium cellulosate in mass ratio 6:6:0.5:0.5 mixing, makees solvent using N-Methyl pyrrolidone, obtains dispersion through high-speed stirred equal
Even electrocondution slurry, coats electrocondution slurry, electrocondution slurry after 80 DEG C of oven for drying in copper foil surface by way of dip-coating
Be formed as conductive layer 2, and the thickness of conductive layer 2 is 6 μm；By the Delanium of 95wt%, the carboxymethyl cellulose of 1.5wt%
Sodium, the conductive black of 1.5wt%, the butadiene-styrene rubber of 2wt% are uniformly mixed to form cathode size, then by the side of transfer coated
Formula is in 2 surface-coated cathode size of conductive layer, and after 100 DEG C of oven for drying, cathode size is formed as cathode membrane, and negative pole
The surface density of diaphragm is 40mg/cm2.
Remaining repeats no more here with embodiment 1.
Comparative example 1
As different from Example 1, conductive layer 2 is not provided with, remaining is with enforcement between the aluminium foil of positive plate and positive pole diaphragm
Example 1, is repeated no more here.
Comparative example 2
As different from Example 1, conductive layer 2 is not provided with, remaining is with enforcement between the Copper Foil of negative plate and cathode membrane
Example 1, is repeated no more here.
Comparative example 3
As different from Example 1, conductive layer 2, the copper of negative plate are not provided between the aluminium foil of positive plate and positive pole diaphragm
Also conductive layer 2 is not provided between paper tinsel and cathode membrane, remaining repeats no more here with embodiment 1.
Respectively energy density, multiplying power are carried out to the lithium ion battery obtained by above-described embodiment 1～10 and comparative example 1～3
Discharge performance and cycle performance test, test result is shown in Table 1.
The battery energy density of 1 embodiment of table and comparative example, multiplying power discharging property and cycle performance test result
From the test result of table 1, conductive layer is set only on positive plate or negative plate compared to comparative example 1～2
2, the present invention has relatively excellent multiplying power discharging property, cycle performance while arranging conductive layer 2 on positive plate and negative plate,
And higher energy density.Compared to the lithium-ion electric for being all not provided with conductive layer 2 on positive plate in comparative example 3 and negative plate
Pond, therefore the present invention can due to increased electric conductivity and caking property between collector 1 and electrode diaphragm 3 after setting conductive layer 2
Enough electrode diaphragms 3 for carrying more high areal density, so as to improve the energy density of lithium ion battery；While the coating of conductive layer 2 can
Reduce the DC internal resistance of battery, the multiplying power discharging property of battery is effectively improved, and keeps higher power density.
Positive plate obtained by comparative example 3 is carried out SEM test, test result is shown in Fig. 2～3.
From Fig. 2～3, the positive plate of conductive layer 2 is not provided with, conductive agent is few, and does not form effective conductive mesh
Network, causes that the electric conductivity between positive pole diaphragm and aluminium foil is poor, and internal resistance is larger, and power density is relatively low.
The announcement of book and teaching according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and is changed.Therefore, above-mentioned specific embodiment the invention is not limited in, every those skilled in the art exist
On the basis of the present invention, done any conspicuously improved, replacement or modification belong to protection scope of the present invention.This
Outward, some specific terms although used in this specification, but these terms are merely for convenience of description, not to the present invention
Constitute any restriction.
Claims (10)
1. a kind of electrode slice, it is characterised in that：Including collector, electrode diaphragm and it is coated between collector and electrode diaphragm
Conductive layer, the conductive layer includes conductive agent and binding agent, the surface density >=20mg/cm of the electrode diaphragm2.
2. electrode slice according to claim 1, it is characterised in that：The conductive agent includes conductive carbon black, electrically conductive graphite, second
At least one in acetylene black, Ketjen black, carbon fiber, CNT, carbon nanocoils and Graphene.
3. electrode slice according to claim 1, it is characterised in that：The binding agent include sodium carboxymethyl cellulose, poly- four
At least one in fluorothene, butadiene-styrene rubber, Kynoar and polyimides.
4. electrode slice according to claim 1, it is characterised in that：Surface density >=the 50mg/cm of the electrode diaphragm2.
5. electrode slice according to claim 1, it is characterised in that：The thickness of the conductive layer is 0.1 ~ 10 μm.
6. electrode slice according to claim 1, it is characterised in that：The mass ratio of the conductive agent and the binding agent is
1.5:1~19:1.
7. electrode slice according to claim 1, it is characterised in that：The conductive layer also includes ceramics, additive and electricity
At least one in the active substance of pole；The ceramics be carborundum, aluminium oxide, silicon oxide, zirconium oxide, calcium oxide, zinc oxide,
At least one in magnesium oxide and titanium oxide；The additive is at least in solid electrolyte, plasticizer and ionic liquid
Kind.
8. electrode slice according to claim 1, it is characterised in that：The electrode diaphragm includes electrode active material, bonding
Agent and conductive agent.
9. a kind of manufacture method of electrode slice according to claim 1, it is characterised in that comprise the following steps：
（1）Electrocondution slurry, electrocondution slurry after oven for drying are coated in collection liquid surface by way of intaglio printing or dip-coating
Be formed as conductive layer；
（2）Then in the electrode coated slurry of conductive layer surface by way of extrusion coated or transfer coated, after oven for drying
Electrode slurry is formed as electrode diaphragm, that is, obtain described electrode slice.
10. the manufacture method of electrode slice according to claim 9, it is characterised in that：Step（1）Middle oven temperature be 60 ~
100℃；Step（2）Middle oven temperature is 80 ~ 120 DEG C.
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| CN107936318A (en) * | 2017-11-10 | 2018-04-20 | 苏州鸿博斯特超净科技股份有限公司 | Antistatic high-cleanness emgloves and preparation method thereof |
| WO2018176979A1 (en) * | 2017-03-31 | 2018-10-04 | 比亚迪股份有限公司 | Battery electrode and method for fabricating same, and lithium-ion battery |
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| CN109786658A (en) * | 2017-11-10 | 2019-05-21 | 宁德时代新能源科技股份有限公司 | Electrode pole piece, electrode pole piece preparation method and lithium ion battery |
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| CN110429348A (en) * | 2019-08-11 | 2019-11-08 | 安徽相源新能源有限公司 | A kind of lithium cell preparation method that stability is high |
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| CN111771300A (en) * | 2018-10-02 | 2020-10-13 | 株式会社Lg化学 | Multi-layer anode comprising silicon-based compound and lithium secondary battery comprising the same |
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| CN110718693A (en) * | 2019-10-24 | 2020-01-21 | 上海奥威科技开发有限公司 | Electrode plate and manufacturing method thereof, super capacitor and lithium ion battery |
| CN112201770A (en) * | 2020-10-15 | 2021-01-08 | 惠州亿纬锂能股份有限公司 | Electrode plate, preparation method thereof and lithium battery |
| CN113193202A (en) * | 2020-12-31 | 2021-07-30 | 佛山市中技烯米新材料有限公司 | Battery current collector and preparation method thereof |
| CN113193204A (en) * | 2021-04-27 | 2021-07-30 | 孚能科技(赣州)股份有限公司 | Electrode plate, preparation method thereof, battery cell structure and battery device |
| CN113193199A (en) * | 2021-04-30 | 2021-07-30 | 中国科学院宁波材料技术与工程研究所 | Graphene-lithium ion conductor material composite conductive slurry, and preparation method and application thereof |
| WO2023230872A1 (en) * | 2022-05-31 | 2023-12-07 | Guangdong Haozhi Technology Co. Limited | Modified current collector for secondary battery |
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