CN110534701A - A kind of electrode plates, electrode plates manufacturing method and electrochemical appliance - Google Patents
A kind of electrode plates, electrode plates manufacturing method and electrochemical appliance Download PDFInfo
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- CN110534701A CN110534701A CN201910721193.2A CN201910721193A CN110534701A CN 110534701 A CN110534701 A CN 110534701A CN 201910721193 A CN201910721193 A CN 201910721193A CN 110534701 A CN110534701 A CN 110534701A
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- material layer
- active material
- electrode plates
- pole piece
- collector
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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
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M4/134—Electrodes based on metals, Si or 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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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 discloses a kind of electrode plates, electrode plates manufacturing method and electrochemical appliances, wherein electrode plates include collector, further include the active material layer being respectively symmetrically set on the collector upper and lower surfaces；The second active material layer being respectively arranged on first active material layer；The collector of second active material layer edge forms tab.The present invention is by changing traditional coating method, on a current collector by the layers of material coating of two kinds of different performances, make its surface layer that there is very fast deintercalate lithium ions ability, it reduces pole piece and analyses lithium risk, improve battery safety, battery is extended, and also improves the power-performance of battery.
Description
Technical field
The present invention relates to battery technology fields, and in particular to a kind of electrode plates, electrode plates manufacturing method and electrochemistry
Device.
Background technique
With the development of new-energy automobile, for lithium ion battery due to its high-energy density, energy without memory is environmental-friendly etc.
Excellent properties are widely applied on the products such as energy storage, portable electronic product, electric car.
But being widely applied with lithium ion battery, more and more problems is also exposed, such as now by pass
The cathode of note analyses lithium problem, this not only results in the loss of the energy content of battery, reduces the service life, and notably, the growth of Li dendrite is also
It is possible that piercing through diaphragm, lead to battery short circuit, causes dangerous.Therefore solve the problems, such as that battery analysis lithium has become extremely urgent ask
Topic.Solve the problems, such as that battery analysis lithium is usually deep from battery design, regulating cell N/P, or control battery charging and discharging at present
Degree etc. considers that, although these methods from battery analysis lithium risk is reduced to a certain degree, the effect is unsatisfactory.
In view of this, improving the safety of battery it is urgent to provide a kind of analysis lithium risk for reducing electrode plates surface, prolonging
Long battery.
Summary of the invention
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is that providing a kind of electrode plates, including
Collector, including the active material layer being respectively symmetrically set on the collector upper and lower surfaces；
The second active material layer being respectively arranged on first active material layer；
The collector of second active material layer edge forms tab.
In the above scheme, the second active material layer thickness is less than the first active material layer thickness.
In the above scheme, first active material layer includes artificial graphite, natural graphite, in MCMB, Si or C
One or more materials；And/or
Second active material layer includes one of active carbon, soft carbon, hard carbon, natural graphite, modified graphite or more
Kind material.
The present invention also provides a kind of manufacturing methods of above-mentioned electrode plates, comprising the following steps:
A1, preparation materials A and material B；
A2, by coating machine, by the materials A of predetermined size, symmetrical, compartment of terrain is coated on collector upper and lower surfaces,
Form the active material layer A for storing lithium ion；
A3, material B is coated on the active material layer A by coating machine, material B is coated on active material layer completely
A forms active material layer B.
In the above-mentioned methods, the step A2 comprising steps of
A21: setting coating machine parameter according to demand, and coating machine is by being sized simultaneously that materials A is symmetrical, compartment of terrain coating
On a current collector, on lower surface；
A22: the collector of the coating material A is dried by drying box, forms the pole of active material layer A
Piece A.
In the above-mentioned methods, the materials A includes artificial graphite, natural graphite, one of MCMB or Si/C material or
The mixture of multiple material；And/or
Material B includes but is not limited to one of active carbon, soft carbon, hard carbon, natural graphite, modified graphite material or a variety of
The mixture of material.
In the above-mentioned methods, step A3 comprising steps of
A31: setting coating machine parameter according to demand, and material B is coated on the active material layer A by coating machine；
A32: the pole piece of step S31 coating material B is dried by drying box, forms active material layer B's
Pole piece B；
It further comprises the steps of: and pole piece B is subjected to roll-in by roll squeezer, cut-parts are carried out to blank area after roll-in, form electrode
Pole piece.
In the above-mentioned methods, the coating thickness of the material B is 2.5 μm -5 μm.
In the above-mentioned methods, the three ranks temperature drying box includes preheating section, the first bringing-up section and the second bringing-up section.
The present invention also provides a kind of electrochemical appliances, including by anode pole piece and cathode pole piece and are set to described positive and negative
The electrode assembly that diaphragm between the pole piece of pole is formed, the electrode assembly are placed in the battery case equipped with electrolyte, the battery case
Lithium ion battery is made in encapsulation, and the cathode pole piece is above-mentioned electrode plates.
The present invention on a current collector by the layers of material coating of two kinds of different performances, is made by changing traditional coating method
Its surface layer has very fast deintercalate lithium ions ability, reduces pole piece and analyses lithium risk, improves battery safety, extend electricity
Pond service life, and also improve the power-performance of battery.
Detailed description of the invention
Fig. 1 is electrode plates layered coatings schematic diagram provided in the present invention；
Fig. 2 is electrode plates schematic cross-section provided in the present invention；
Fig. 3 is electrode plates production method flow chart provided in the present invention；
Fig. 4 is the pole piece bar schematic diagram that does not cut after roll-in provided in the present invention.
Specific embodiment
The present invention on a current collector by the layers of material coating of two kinds of different performances, is made by changing traditional coating method
Its surface layer has very fast deintercalate lithium ions ability, reduces pole piece and analyses lithium risk, improves battery safety, extend electricity
Pond service life, and also improve the power-performance of battery.With reference to embodiment with Figure of description to this hair
It is bright to be described in detail, but the embodiment in application documents should not be construed as the limitation to present specification.
As shown in Figs. 1-2, the present invention provides a kind of electrode plates, including collector, play the role of transmitting electronics；This
The optional electric conductivity of the preferred collector of embodiment excellent copper foil and tinfoil paper；
The first active material layer 1 being respectively symmetrically set on collector upper and lower surfaces, 1 area of the first active material layer are big
It is small related to lithium battery demand, for storing lithium ion；
The second active material layer 2 being respectively arranged on the first active material layer 1 has quick deintercalate lithium ions performance,
It reduces pole piece and analyses lithium risk, reduce battery polarization；
The collector of second active material layer, 2 edge forms tab 3, and edge is uncoated first active material in surface
The afflux body region of layer 1 and the second active material layer 2；
First active material layer 1 can store more lithium ion, but deintercalate lithium ions are slower, the second active material layer
The ability of 2 storage lithium ions is low, but deintercalate lithium ions speed is fast；
First active material layer 1 includes artificial graphite, natural graphite, the materials such as the graphitized carbon materials such as MCMB or Si/C
One of material or multiple material, have good electric conductivity；
Second active material layer 2 can be in the nano-scale carbon materials such as active carbon, soft carbon, hard carbon, natural graphite, modified graphite
A kind of material or multiple material, these materials have quick deintercalate lithium ions performance, and expect that particle is uniform, and wellability is good,
And guarantee that the second active material layer 2 can quick lithium ion deintercalation ability；
Second active material layer 2 and the first active material layer 1 are in the same size；
The thickness of first active material layer 1 is greater than the thickness of the second active material layer 2；Second active material layer 2 mainly rises
Booster action, because battery analysis lithium is generally related with pole piece material deintercalate lithium ions speed, the second active material layer 2
It is only coated in 1 surface of the first active material layer, pole piece is reduced and analyses lithium risk, reduce battery polarization, so the second activity
Thickness is the smaller the better while the design of 2 thickness of material layer only needs to guarantee to reach the function of deintercalate lithium ions, because of electrode
The thickness of pole piece directly affects the thickness of lithium battery, therefore electrode plates more Bao Caineng keeps lithium battery thinner, then with lithium electricity
The volume of the product in pond also will be smaller, for example, lithium battery mobile phone currently on the market, all manufacturers are all by changing what is most asked
The size of dependent element, or guarantee the thickness for reducing lithium battery while lithium battery cruise duration；Second active matter in the present embodiment
Matter layer 2 is with a thickness of 1.5 μm -3 μm, and preferably 2 μm；
The present invention also provides a kind of methods for making above-described embodiment pole piece, as shown in Figure 3, comprising the following steps:
S1, mixing, preparation materials A and material B are carried out according to demand；
S2, by coating machine predetermined size, by materials A, symmetrical, compartment of terrain is coated on collector upper and lower surfaces, shape
Viability material layer A, for storing lithium ion；
S3, material B is coated on the active material layer A by coating machine, material B is coated on active material layer completely
A forms active material layer B, has quick deintercalate lithium ions performance, reduces pole piece and analyses lithium risk, reduces battery polarization
Function.
The layers of material coating of two kinds of different performances on a current collector, has its surface layer very fast de- by the present embodiment method
Embedding lithium ion ability reduces pole piece and analyses lithium risk, improves battery safety, extend battery, and
Also improve the power-performance of battery；
But actually since homogenate, coating, baking and the roll-in during electrode fabrication all have biggish variable,
The admixture of each component is widely different, and this otherness will have a direct impact on the overall performance of electrode.
Above-mentioned steps S2 comprising steps of
S21: setting coating machine parameter according to demand, and coating machine is by being sized simultaneously that materials A is symmetrical, compartment of terrain coating
On a current collector, on lower surface；
The present embodiment, the size of materials A coating on a current collector is configured according to practical application request, with lithium electricity
For pond, electrode plates are formed since the collector after completing cut, irregular marginal portion need to be gone
Fall, such as due to being interval coating when coating material, then both ends generally will form flange, these flanges are conductive to pole piece, analyse
Lithium all exists and influences, so materials A coated area size is greater than lithium battery pack case size, such as lithium battery pack case is big
Small is 20cm × 20cm, then materials A coated area sets at least to 20cm × 21cm.
S22: the collector of above-mentioned coating material A is dried by drying box, forms the pole of active material layer A
Piece A；
The present embodiment is preferred, and drying box is two ranks or three rank temperature drying boxes, and two rank temperature drying boxes include preheating section,
Bringing-up section；Three rank temperature drying boxes include preheating section, the first bringing-up section and the second bringing-up section；
The collector of coating material A passes through the mesh belt in drying box respectively and moves by pre-set velocity from low-temperature zone to high temperature section
Dynamic, such as using three rank temperature drying boxes, the collector of coating material A moves through preheating section respectively, the first bringing-up section and the
Two bringing-up sections；Since the boiling point of water in materials A is lower, surface tension is larger, if being directly over high-temperature baking, coating moisture is sharply
Evaporation, will lead to the surface that the binder wherein carried is more gathered in electrode, or lead to coating cracking.
Since materials A prepares the difference of material, to reach more preferable lithium ion storage capacity, coating thickness is not then identical；
The present embodiment, materials A include but is not limited to artificial graphite, natural graphite, the graphitized carbon materials such as MCMB or Si/C
The mixture of one of equal materials material or multiple material；Material B includes but is not limited to active carbon, soft carbon, hard carbon, high power
One of the nano-scale carbon materials such as graphite, modified graphite material or multiple material mixture；In a particular embodiment materials A/
The material category that material B is formed is different, then the electrode deintercalate lithium ions performance formed, reduces pole piece and analyses lithium degree of risk
It is also different；
Materials A and material B are other than containing above-mentioned material, it is also necessary to conductive agent, binder be added according to ratio；It is specific to lift
Example explanation are as follows:
Each ingredient specific gravity of materials A can be artificial graphite: SP (conductive agent): CMC (binder)=95:2:3 or MCMB:SP:
CMC=90:3:7；
Each ingredient specific gravity of material B can be high power graphite, and: SP:PVDF (binder) is 92:3:5 or hard carbon: SP:PVDF is
89:3:8。
Two kinds of materials As in the present embodiment, B have certain difference, first A material specific capacity with higher in performance,
More lithium ion can be stored, but its speed when deintercalate lithium ions is slow, we are carrying out high current in this way
When charge and discharge, polarization can be generated, surface is caused to analyse lithium.B material specific capacity is lower, and cycle efficieny is poor for the first time, still
Its when high current charge-discharge can quick removal lithium embedded, reduce battery polarization phenomenon, reduce surface analysis lithium risk, because
The advantages of two kinds of materials is utilized in this, and B material is coated in surface, can shift the lithium ion to come with fast storage anode, avoid
Analyse lithium.
In addition, the coating thickness of materials A is set according to battery NP ratio and capacity of material etc., this material
NP ratio will suitably, be will not influence substantially to battery performance within this range, but NP ratio is less than in a certain range
1, battery can analyse lithium, and NP ratio is greater than 1.1 or so, capacity of negative plates will be caused to waste, and capacity of negative plates, which plays, to be reduced, the present embodiment
In,
NP=negative electrode active material gram volume * cathode surface density * negative electrode active material percentage/positive active material gram holds
Measure * anode surface density * positive active material percentage；
Thickness=surface density/area；
From this formula it will be seen that thickness is to materials A gram volume and NP ratio be it is relevant, as shown in the table.
The positive gram volume 150mAh/g of setting, activity substance content 0.95, positive surface density 150, N/P ratio are in the following table 1
1.06, positive electrode various parameters are constant.
Table 1, the coating thickness of materials A and materials A gram volume and NP compare relation table
The coating thickness of materials A is different, then it is also variant in each section of bringing-up section and movement speed for passing through drying box,
The present embodiment preheating section temperature is 50 DEG C -60 DEG C, and the first bringing-up section temperature is 70 DEG C -105 DEG C, and the second bringing-up section is 75 DEG C -85
℃；The movement speed that the collector of coating material A passes through drying box is 1.2-1.8m/s, and the movement speed of drying box is reasonably set
It sets and guarantees that the materials A of collector coating can guarantee drying, and be avoided that prolonged baking leads to coating cracking while saving
Time.
The present embodiment is preferred, and the temperature of preheating section, the first bringing-up section and the second bringing-up section is respectively 60 DEG C, and 90 DEG C, 80
℃；
Preferably, the collector of coating material A is 1.5m/s by baking oven speed, and speed may cause pole piece very much fastly cannot
Drying.
Above-mentioned steps S3 comprising steps of
S31: setting coating machine parameter according to demand, and material B cladding is applied on the active material layer A by coating machine；
S32: similarly, according to above-mentioned steps S22, the pole piece A of step S31 coating material B being dried by drying box,
Form the pole piece B of active material layer B；
Material B coating thickness is 10 μm -20 μm, preferably 15 μm in the present embodiment；
Since active material layer B is mainly the function of can reach deintercalate lithium ions, in order to guarantee the electrode after drying, roll-in
Pole piece thickness is most thin, it is only necessary to material B coating when 3 coating thickness be greater than material B in active material the largest particles it is straight
Diameter, in order to avoid active material particle is crushed or scratches when material coating or roll-in；For example, including active carbon in material B, soft
Two kinds of materials of carbon, and active carbon and the material grains diameter of soft carbon are respectively 13 μm and 18 μm, then the thickness of material B coating is answered
Greater than 18 μm.
The difference of material is prepared according to material B, coating thickness is not then identical, and mobile speed is not also identical when drying, by
It is thinner than the coating thickness of materials A in material B coating thickness, therefore movement speed when heating temperature and heating needs to adjust again
It is whole.
The present embodiment preheating section temperature is 40 DEG C -50 DEG C, and the first bringing-up section temperature is 90 DEG C -105 DEG C, and the second bringing-up section is
60℃-75℃；The movement speed that the pole piece A of coating material B passes through drying box is 2-2.5m/s, and the movement speed of drying box is closed
The setting of reason guarantees that the material B of collector coating can be dried and is avoided that prolonged baking leads to coating cracking.
The present embodiment is preferred, and the temperature of preheating section, the first bringing-up section and the second bringing-up section is respectively 40 DEG C, and 95 DEG C, 60
℃；
Preferably, the pole piece A of coating material B is 2.2m/s by baking oven speed.
The present embodiment, it is to finally cut pole piece B that material B cladding, which is applied on the active material layer A,
When, by each molding pole piece area because the concave-convex edge that coating is formed is cut off, material B cladding is applied to the active matter
It can guarantee that active material layer B and active material layer A are in the same size after cutting, do not influence the electric energy property of pole piece on matter layer A.
The present embodiment, further comprising the steps of:
S4, pole piece B is subjected to roll-in by roll squeezer, cut-parts is carried out to the pole piece B after roll-in, form electrode plates, such as
Shown in Fig. 4, it is illustrated as the pole piece B not cut after roll-in.
In the present embodiment, due to the difference of the active material layer B thickness after the difference of material B material, and drying, roll squeezer
The dynamics for carrying out roll-in will be different, and the preferred roll squeezer pressure of the present embodiment is 1-2.5Mpa, and materials at two layers is compressed reality
Active material layer A and active material layer B will not be crushed simultaneously, and preferably roll squeezer pressure is 1.6Mpa.
Thickness gets over Bao Yuehao, the preferred active material layer B thickness < active material of the present embodiment when because of lithium ion battery use
Layer A thickness；
For the ease of cutting out and making the electrode plates electric energy property after cutting out unaffected, each independent pole piece on pole piece B
The size in area 4 should be greater than the electrode plates after cutting out.
In addition, it is necessary to explanation, in the present embodiment, because collector is continuously, in entire materials A and material B
During coating, it is that coating machine and drying box flowing water can be made to work, saves the time in this way；
Illustrate this method below by specific implementation case, see Table 4 for details, and preheating section temperature is C1, the first heating in table
Duan Wendu is C2, and the second bringing-up section temperature is C3, dryer movement speed V1.
(1) following table is (layer of material A comprising artificial graphite and to include hard carbon using the electrode plates in the present embodiment
B layers of material) and only the electrode plates of setting active material layer A coating are fabricated to Symmetrical cells, and to its ion-transfer impedance
(Rion) it is tested, in following table, only analyzes in materials A and material B the case where all only including a kind of above-mentioned material.
Table 2, different material layer electrode plates are fabricated to the ionic resistance result of Symmetrical cells
By test result in upper table, discovery is superimposed the electrode plates formed (the present embodiment electrode by materials A and material B
Pole piece) have lower ion-transfer impedance, illustrate material B formed active material layer when deintercalate lithium ions by compared with
Small resistance, so battery polarization when this will reduce charge and discharge, reduces analysis lithium risk.
(2) power of battery in upper table is tested, as shown in the table.
Table 3 tests the power of battery in upper table
In upper table, the electrode plates that natural graphite and hard carbon material are used in combination, and battery fills, the condition of putting is respectively
It can find that the single power of its power ratio wants high under the test condition of 3.7C and 5C, internal resistance wants small, this illustrates the present embodiment electrode
Pole piece has lesser internal resistance.Ionic transfer resistance is smaller under the conditions of charge-discharge test, and when high current charge-discharge can reduce
Battery polarization reduces battery and analyses lithium risk.
(3) each influence factor influences electrode plates analysis lithium, as shown in table 4 below.
Table 4, electrode plates, which make each influence factor, influences battery analysis lithium
Following table is the constituent mass of materials A and material B ratio in corresponding table 4
The constituent mass of materials A and material B ratio in table 5, corresponding table 4
In above-mentioned table, when artificial graphite (materials A) and hard carbon (material B) are that coating thickness is respectively 60 μm and 20 μm,
Battery shows higher power and lower internal resistance, and under normal temperature conditions, 5C discharges, under the test condition of 3.75C charging,
Discharge power improves 24% when independent one layer of active material layer made of artificial graphite material is used alone in its power ratio, charging
Power improves 19.7%, and electric discharge internal resistance reduces 17.4%, and internal charging resistance reduces 20%.This is because this experiment is used hard
Carbon has faster lithium ion deintercalation ability, carries out smaller to lithium ion inhibition when charge and discharge, and its particle is opposite
It is smaller in artificial graphite, it can change pole piece flatness coated in artificial graphite surface, reduce material interface internal resistance.Work as electricity
When carrying out charge and discharge, surface hard carbon can carry out rapidly removal lithium embedded in pond, reduce battery and analyse lithium risk.
The present invention also provides a kind of electrochemical appliances, include lithium ion battery made of above-mentioned electrode plates, including
Cathode pole piece made of anode pole piece, above-mentioned electrode plates, by the positive and negative electrode pole piece and the diaphragm between positive and negative electrode pole piece
Electrode assembly placing battery shell is added electrolyte post package and lithium ion battery is made by the electrode assembly of formation.Anode pole piece is
Present conventional use of such as LiFePO4, pole piece made of ternary material.
With the electrochemical appliance of electrode plates provided in this embodiment, electrode plates surface layer has very fast deintercalate lithium ions
Ability, pole piece analysis lithium risk is low, and battery safety is higher, extends battery, and improve battery
Power-performance.
In the present embodiment, the application of above-mentioned electrochemical appliance is not defined, as long as the electronics of this electrochemical appliance can be used
Product, such as energy-storage battery, portable electronic product, electric vehicle etc. fall within protection scope of the present invention.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn that the knots made under the inspiration of the present invention
Structure variation, the technical schemes that are same or similar to the present invention are fallen within the scope of protection of the present invention.
Claims (10)
1. a kind of electrode plates, including collector, which is characterized in that including being respectively symmetrically set to the collector upper and lower surfaces
On active material layer；
The second active material layer being respectively arranged on first active material layer；
The collector of second active material layer edge forms tab.
2. electrode plates as described in claim 1, which is characterized in that the second active material layer thickness is less than described first
Active material layer thickness.
3. electrode plates as claimed in claim 1 or 2, which is characterized in that first active material layer includes artificial graphite,
Natural graphite, one of MCMB, Si or C or multiple material；And/or
Second active material layer includes one of active carbon, soft carbon, hard carbon, natural graphite, modified graphite or a variety of materials
Material.
4. a kind of manufacturing method of any one of claim 1-3 electrode plates, which comprises the following steps:
A1, preparation materials A and material B；
A2, by coating machine, by the materials A of predetermined size, symmetrical, compartment of terrain is coated on collector upper and lower surfaces, is formed
For storing the active material layer A of lithium ion；
A3, material B is coated on the active material layer A by coating machine, material B is coated on active material layer A shape completely
Viability material layer B.
5. electrode plates manufacturing method as described in claim 1, which is characterized in that the step A2 comprising steps of
A21: setting coating machine parameter according to demand, and by being sized simultaneously, by materials A, symmetrical, compartment of terrain is coated in and collects coating machine
On fluid upper and lower surfaces；
A22: the collector of the coating material A is dried by drying box, forms the pole piece A of active material layer A.
6. electrode plates manufacturing method as described in claim 1, which is characterized in that the materials A includes artificial graphite, naturally
Graphite, the mixture of one of MCMB or Si/C material or multiple material；And/or
Material B includes but is not limited to one of active carbon, soft carbon, hard carbon, natural graphite, modified graphite material or multiple material
Mixture.
7. electrode plates manufacturing method as claimed in claim 4, which is characterized in that step A3 comprising steps of
A31: setting coating machine parameter according to demand, and material B is coated on the active material layer A by coating machine；
A32: the pole piece of step S31 coating material B is dried by drying box, forms the pole piece of active material layer B
B；
It further comprises the steps of: and pole piece B is subjected to roll-in by roll squeezer, cut-parts are carried out to blank area after roll-in, form electrode plates.
8. electrode plates manufacturing method as claimed in claim 7, which is characterized in that the coating thickness of the material B is 2.5 μ
m-5μm。
9. electrode plates manufacturing method as described in claim 5 or 7, which is characterized in that the three ranks temperature drying box includes
Preheating section, the first bringing-up section and the second bringing-up section.
10. a kind of electrochemical appliance, including by anode pole piece and cathode pole piece and the barrier film shape between the positive and negative electrode pole piece
At electrode assembly, the electrode assembly is placed in the battery case equipped with electrolyte, and lithium-ion electric is made in the battery case encapsulation
Pond, which is characterized in that the cathode pole piece is the electrode plates of any one of claim 1-3.
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