CN106531961A - Electrode pole plate of lithium ion battery, pole plate rolling device and lithium ion battery - Google Patents
Electrode pole plate of lithium ion battery, pole plate rolling device and lithium ion battery Download PDFInfo
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- CN106531961A CN106531961A CN201710026308.7A CN201710026308A CN106531961A CN 106531961 A CN106531961 A CN 106531961A CN 201710026308 A CN201710026308 A CN 201710026308A CN 106531961 A CN106531961 A CN 106531961A
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- ion battery
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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
- H01M4/043—Processes of manufacture in general involving compressing or compaction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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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
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The invention discloses an electrode pole plate of a lithium ion battery. The electrode pole plate comprises a current collector and active substance coating layers, wherein the active substance coating layers are uniformly coated at two sides of the current collector, and grooves are symmetrically and uniformly formed in surfaces of the active substance coating layers at two sides. A thick pole plate with specially-shaped grooves in a surface are prepared, the electrolyte retention quantity in the battery can be remarkably increased, and long-term recycle of the battery is promoted; moreover, the specially-shaped grooves are uniformly formed in the surface of the thick pole plate, electrolyte penetration and diffusion are facilitated, and the rate charge-discharge electrochemical performance of the battery is improved; and meanwhile, the specially-shaped grooves are uniformly formed in the surface of the thick pole plate, thus, the specific area of the pole plate is expanded, the polarization current density of the battery during the charge-discharge process is reduced, a lithium precipitation risk of a large-current charging positive electrode separator is improved, and the application safety of the battery is improved.
Description
Technical field
The present invention relates to new energy field, especially relate to lithium ion battery electrode piece, pole piece rolling device and
Lithium ion battery.
Background technology
With wideling popularize for new-energy automobile, electrokinetic cell demand increasingly increases.Measure especially for high energy, it is high
Safety, the craving of long circulation life lithium-ion-power cell are especially prominent.Energy density lithium ion power battery generally has
Have：(1) activity substance content in high unit mass (volumetric spaces), (2) high gram volume positive/negative material, (3) more low quality
Packaging material of density etc..In recent years, numerous lithium battery manufacturers are by increasing pole piece coating layer of active substance thickness or compacted density
To improve the space hold ratio of active substance, the purpose for lifting battery integral energy density is reached.However, thick coat electrode
Pole piece increased contact distance of the bottom active substance with electrolyte, extend lithium-ion electric migration distance, will cause electrolysis
The infiltration and absorption of liquid is more difficult, so that the internal resistance of cell is larger, battery charge and discharge process polarization potential is higher, and capacity is sent out
Wave a series of problems, such as abnormal, high rate performance is poor, low temperature analyses lithium, Capacity fading is fast.Especially in high current density and
Discharge and recharge under low temperature environment causes Li dendrite to be formed, and Li dendrite pierces through isolating membrane causes both positive and negative polarity short circuit, there is certain safety
Hidden danger.And, the generation of Li dendrite increased the side reaction of electrolyte and lithium metal, consume lithium active substance, reduces battery and follows
Ring utilization rate.
Mainly adopt with the following method to change for existing thick coating or high compacted density electrode plates those skilled in the art
The infiltration of kind electrolyte, to improve the migration rate of lithium ion, so as to solving because of heavy coated electrode pole piece internal concentration polarization
Greatly, the problem that high rate performance is poor, pole piece concordance is poor：(1) prepare the active material slurry coating containing different pore-creating agent concentrations
Collector obtains having porosity gradient coating pole piece in a thickness direction, is infiltrated with the infiltration for improving electrolyte, improves electrode
The transmission of middle lithium ion/electronics is (such as patent of invention：CN102324493A, CN102694150A, CN102655229A)；(2) adopt
Multiple layered coatings mode is carried out with low-solid content slurry and prepares the heavy coated electrode pole piece with different porosities gradient
(such as patent of invention：CN102969483A)；(3) roll pressing is carried out using band felting needle roller to current collector aluminum foil and must contains some holes
Base material, the problem for being conducive to improving electrode two sided coatings became uneven is coated using this base material (such as patent of invention：
CN102760863A)。
But in above-mentioned existing improved method, bring while thick coating pole piece electrolyte permeability sex chromosome mosaicism is improved and make
The different negative effects such as hole agent residual, multi-layer coated complex procedures, the easily broken band of punching collector, therefore, existing high-energy is close
The manufacture method of degree lithium-ion-power cell thickness coated electrode pole piece could be improved.
The content of the invention
The main object of the present invention is a kind of lithium ion battery electrode piece of offer, it is intended to solve existing high-energy density lithium
The negative issue that ion battery is brought because adopting thick coating layer of active substance pole piece.
The present invention proposes a kind of lithium ion battery electrode piece, including：Collector and coating layer of active substance；The active matter
Matter coating uniform is coated in collector both sides, and the coating layer of active substance surface of the both sides is symmetrically uniformly distributed groove.
Preferably, the coating layer of active substance thickness of the both sides is 200 μm to 300 μm.
Preferably, the groove is one or more in cone-shaped groove, wedge-shaped impression or square groove；The groove
Interstice coverage is 100 μm to 500 μm.
Preferably, the collector is in metal aluminum foil, metal copper foil, conductive coating aluminium foil or conductive coating Copper Foil
Kind.
Preferably, the groove is colded pressing and is prepared from by the roll-in of specific boss roll shaft or specific boss flat board.
The present invention also proposes a kind of pole piece rolling device, including：Roll shaft and roll shaft surface are uniformly distributed boss；The roller
Axle surface is uniformly distributed boss, and during roll-in pole piece, on the coating layer of active substance surface of the pole piece both sides, symmetrically roll-in goes out
It is uniformly distributed groove.
Preferably, during the equally distributed boss in the roll shaft surface is conical boss, wedge shape boss or square boss
One or more；The boss interstice coverage is 100 μm to 500 μm.
The present invention also proposes a kind of lithium ion battery, including：Anode pole piece, cathode pole piece, isolating membrane, shell and electrolysis
Liquid, the coating layer of active substance surface of the anode pole piece both sides are symmetrically uniformly distributed groove；The work of the cathode pole piece both sides
Property matter coatings surface is uniformly distributed groove.
Preferably, the collector of the anode pole piece is metal aluminum foil, and the aluminum foil thickness is 10 μm to 15 μm；It is described negative
The collector of pole pole piece is metal copper foil, and the copper thickness is 6 μm to 10 μm；The anode pole piece, cathode pole piece both sides
Coating layer of active substance thickness is 200 μm to 300 μm.
Preferably, the anode pole piece positive active material, conductive agent, the mass ratio of binding agent are 93～97:2～5:1
～3；The cathode pole piece negative electrode active material, conductive agent, binding agent mass ratio are 91～95:2～5:3～6.
Beneficial effect of the present invention：
Contrasting existing thick coating or high compacted density electrode plates improves the infiltration of electrolyte, improves the migration speed of lithium ion
The method of rate, the present invention program is colded pressing by the roll-in of specific boss roll shaft or specific boss flat board makes the active matter of thick pole piece both sides
Matter coating surface is symmetrically uniformly distributed groove, improves the infiltration of electrolyte, improving the migration rate of lithium ion, and then solution lithium
The series of negative problem that ion battery is brought because electrode plates are blocked up.Active substance in the present invention program in coated collector
Layer does not add any pore creating material, therefore can avoid, as pore creating material distils or it is incomplete to decompose, there is residual to battery in pole piece
Capacity will be adversely affected；And compared to multiple coating process is layered, this method is simple to operate and pole piece hole is easily controlled
System；Compared to active substance mode is coated with after collector punching, the present invention program operation will not lose battery energy density, and roller
Press operation is easy, and production efficiency is high.
The present invention prepares the groove that thick pole piece has given shape, can significantly improve battery electrolyte recoverable amount, have
Use beneficial to battery long circulating；And thick pole piece is uniformly distributed given shape groove, is conducive to the infiltration and expansion of electrolyte
Dissipate, improve the discharge and recharge chemical property of battery；Thick pole piece is uniformly distributed given shape groove and increased pole piece simultaneously
Specific surface area, reduce the polarized current density in battery charge and discharge process, improve large current charge anode diaphragm analysis lithium
Risk, improves the safe handling of battery.
Description of the drawings
Electrodes of lithium-ion batteries surface topography schematic diagram in Fig. 1 one embodiment of the invention；
Electrodes of lithium-ion batteries cross-sectional view in Fig. 2 one embodiment of the invention；
The roll shaft structure schematic diagram of pole piece rolling device in Fig. 3 one embodiment of the invention；
The roll shaft surface boss top view of pole piece rolling device in Fig. 4 one embodiment of the invention；
The roll shaft surface boss profile of pole piece rolling device in Fig. 5 one embodiment of the invention.
The realization of the object of the invention, functional characteristics and advantage will be described further in conjunction with the embodiments referring to the drawings.
Specific embodiment
It should be appreciated that specific embodiment described herein is not intended to limit the present invention only to explain the present invention.
See figures.1.and.2, the embodiment of the present invention proposes a kind of lithium ion battery electrode piece, including：Collector 3 and work
Property matter coatings 1；1 even application of the coating layer of active substance is on collector both sides, 1 surface of coating layer of active substance of the both sides
Groove 2 is uniformly distributed symmetrically.
The battery negative effect brought to improve thick pole coating in prior art employs some improving countermeasures, but existing
Technology still has many weak points, and the pore creating material being such as added in slurry has the volatile characteristic of high temperature, in coating baking, does
If temperature control is improper during dry and can cause pore creating material distillation or decompose incomplete, there is residual and battery capacity will be caused to bear
Face rings.Additionally, preparing with different porosities gradient coating pole piece electrode, generally realized using the multiple coating method of layering,
Preparation section is considerably complicated.Hole knockout is carried out using band felting needle roller to collector foil and obtains high porosity diaphragm structure, though
Infiltration and diffusion of the electrolyte on diaphragm thickness direction can be so effectively improved, but pore-creating will cause the drop of battery energy density
It is low, meanwhile, high porosity diaphragm easily broken band in follow-up high intensity tension force stretching nipping process causes production and processing efficiency low.
In consideration of it, embodiments provide a kind of highly secure lithium ion battery electrode plates manufacture method, adopt the method can be with
Produce thick coating pole piece pore-size distribution adjustable, operation implements simple, and to pole piece active substance without destruction, the short time can criticize
Amount production.Additionally, having high electrolyte recoverable amount using the battery of this pole piece structure, charging and discharging currents even density is effectively kept away
The formation for exempting from Li dendrite causes to pierce through isolating membrane generation internal short-circuit risk.
Further, the thickness of the coating layer of active substance 1 of the both sides is 200 μm to 300 μm.The groove 2 is circular cone
One or more in connected in star, wedge-shaped impression or square groove；2 interstice coverage of the groove is 100 μm to 500 μm.
Increase pole piece coating layer of active substance thickness or compacted density to improve the space hold ratio of active substance, reach and carry
Rise the purpose of battery integral energy density.However, thick coating pole piece increased contact distance of the bottom active substance with electrolyte,
Extend lithium-ion electric migration distance, will cause electrolyte infiltration and absorb it is more difficult so that the internal resistance of cell compared with
Greatly, battery charge and discharge process polarization potential is higher, and capacity plays poor abnormal, high rate performance, low temperature analysis lithium, Capacity fading
Fast a series of problems, such as.Especially under high current density and low temperature environment charge cause Li dendrite to be formed, Li dendrite pierce through every
Cause both positive and negative polarity short circuit from film, there is certain potential safety hazard.And, the generation of Li dendrite increased electrolyte with lithium metal
Side reaction, consumes lithium active substance, reduces circulating battery utilization rate.
The embodiment of the present invention employs heavy coated electrode structure design to improve battery energy density, but to improve thick pole
The negative performance effects that piece brings, the present invention prepare thick pole piece and are uniformly distributed the groove with given shape, significantly can carry
High battery electrolyte recoverable amount, is conducive to the infiltration and diffusion of electrolyte, improves the discharge and recharge chemical property of battery；Simultaneously
The trench gap for keeping certain can increase the specific surface area of pole piece, reduce the polarized current density in battery charge and discharge process,
High current or low temperature charged anode diaphragm analysis lithium risk are improved, the safe handling of battery is improve.
Further, during the collector 3 is metal aluminum foil, metal copper foil, conductive coating aluminium foil or conductive coating Copper Foil
One kind.
The electric current that cell active materials are produced mainly is collected defeated to form larger current versus by collector
Go out, therefore collector should be fully contacted with active substance, and internal resistance as little as possible should be preferred.Battery is led using functional coating
Electric base material is surface-treated, and reduces the contact resistance between both positive and negative polarity active substance and collector, and increase between the two is attached
Put forth effort, the static conductive ability of collector can be increased, and then lift the overall performance of battery.
Further, the groove 2 is colded pressing and is prepared from by the roll-in of specific boss roll shaft or specific boss flat board.
Positive and negative electrode pole piece coiled strip after the completion of coating is put into the roll-in with drawing tension for 25N by the embodiment of the present invention
On winding device, it is 10m/min to control tape running speed, arranges specific boss roll shaft roll-in and rolls power sizes values, cathode pole piece roll-in
Power is rolled for 15 tons, anode pole piece roll-in rolls power for 50 tons, carries out continuous rolling, pole piece both sides symmetrically equally distributed ditch is obtained
Groove 2.Also pole piece after coating can be horizontally placed at into two with identical using similar to the flat board with identical boss appearance structure
Between the flat board of boss appearance structure, apply a certain size pressure and carry out compacting to obtain pole piece both sides symmetrically equally distributed ditch
Groove 2.
With reference to Fig. 3, Fig. 4 and Fig. 5, the embodiment of the present invention also proposes a kind of pole piece rolling device, including：Roll shaft 5 and roller
5 surface of axle is uniformly distributed boss 4；5 surface of the roll shaft is uniformly distributed boss 4, in the pole piece both sides during roll-in pole piece
Symmetrically roll-in goes out to be uniformly distributed groove 2 on coating layer of active substance 1 surface.
Above-mentioned specific roll shaft 5 can be prepared using laser ablation cylindrical roll shaft, and the roll shaft for preparing has equal
The film layer structure of even distribution boss 4, by the synchronous roll-in of above-mentioned two identical roll shaft 5 preparing pole piece active matter coating surface
Double-sided symmetrical distribution groove 2.
Further, the equally distributed boss 4 in 5 surface of the roll shaft is wedge shape boss；4 interstice coverage of the boss is
100 μm to 500 μm.
The embodiment of the present invention is prepared simply from wedge shape boss 4, low manufacture cost, and can realize sending out for the embodiment of the present invention
Improving eyesight.4 interstice coverage of boss described in the embodiment of the present invention is 100 μm to 500 μm, can have higher ratio table with holding electrode
Area, both positive and negative polarity surface pore corresponding region are conducive to the storage of electrolyte.
The embodiment of the present invention also proposes a kind of lithium ion battery, including：Anode pole piece, cathode pole piece, isolating membrane, shell with
And electrolyte, the coating layer of active substance surface of the anode pole piece both sides is symmetrically uniformly distributed groove；The cathode pole piece two
The coating layer of active substance surface of side is symmetrically uniformly distributed groove.
The anode pole piece of above-mentioned lithium ion battery, cathode pole piece employ the coating layer of active substance surface of both sides symmetrically
The structure design of groove is uniformly distributed, the recoverable amount of battery pole piece electrolyte is maximally improved, is maximized and is improved lithium ion battery
Electrolytic solution permeability, and then improve lithium ion battery comprehensive electrochemical properties.
In the embodiment of the present invention, involved anode pole piece, cathode pole piece, can be anode pole piece or cathode pole piece
The coating layer of active substance surface of both sides is symmetrically uniformly distributed groove.And the shape of the groove, size, spacing are for same
The both positive and negative polarity pole piece of battery can random fit, but should be uniformly right for the groove on the both sides coating layer of active substance surface of same pole piece
The distribution of title property, to meet the requirement of pole piece balanced current distribution, reduces electrode plates localizing electrode phenomenon.
Further, the collector of the anode pole piece is metal aluminum foil, and the aluminum foil thickness is 10 μm to 15 μm；It is described
The collector of cathode pole piece is metal copper foil, and the copper thickness is 6 μm to 10 μm；The anode pole piece, cathode pole piece both sides
Coating layer of active substance thickness be 200 μm to 300 μm.
Further, the anode pole piece positive active material, conductive agent, the mass ratio of binding agent are 93～97:2～5:
1～3；The cathode pole piece negative electrode active material, conductive agent, binding agent mass ratio are 91～95:2～5:3～6.
Prepare above-mentioned based lithium-ion battery positive plate：By anode material nickel cobalt manganic acid lithium LiNi0.5Co0.2Mn0.3O2, conductive agent
Carbon black, binding agent Kynoar (PVDF) are 95 according to mass ratio:3:After 2 mix homogeneously, Solvents N-methyl pyrrolidine is added
Ketone (NMP) uniform stirring mixes, and obtains uniform slurry of pole piece of positive pole.Above-mentioned slurry is coated on into the metal aluminum foil collection of 12 μ m thicks
Fluid is two-sided, about 300 μm of coating double thickness, then dries in 110 DEG C of vacuum ovens.
The roll shaft of wedge shape boss is evenly distributed with using two identical surfaces, under 50 tons of pressure, to positive pole after drying
Pole piece two sides carries out continuous rolling, and after roll-in, anode pole piece surface has vee-cut, and trench gap distance is 100 μm, groove
Width is 100 μm, and gash depth is 100 μm, and is symmetrically evenly distributed on anode pole piece both side surface.
It is prepared by negative plate：By negative electrode active material Delanium FSN-1, conductive agent carbon black, binding agent carboxymethyl cellulose
(CMC) and butadiene-styrene rubber (SBR) according to mass ratio be 93:3:2:2 mix homogeneously, add solvent deionized water uniform stirring to mix
Close, obtain uniform cathode pole piece slurry.The metal copper foil collector that above-mentioned slurry is coated on 8 μ m thicks is two-sided, coats two-sided
About 300 μm of thickness, then dries in 100 DEG C of vacuum ovens.
The roll shaft of wedge shape boss is evenly distributed with using two identical surfaces, under 15 tons of pressure, to negative pole after drying
Pole piece two sides carries out continuous rolling, and after roll-in, cathode pole piece surface has vee-cut, and trench gap distance is 100 μm, groove
Width is 120 μm, and gash depth is 120 μm, and is symmetrically evenly distributed on cathode pole piece both side surface.
Make lithium-ion-power cell：Above-mentioned technique is prepared into anode pole piece, cathode pole piece is ceramic with PE/PP/PE
Isolating membrane is assembled into battery core according to winding or lamination process, and above-mentioned ceramic diaphragm has aluminium oxide ceramics for isolating membrane dual coating
Layer.Battery core is placed in battery case, welding encapsulation is carried out after vacuum drying treatment, and is injected electrolyte, above-mentioned electrolyte is
The lithium hexafluorophosphate electrolyte solution of 1.0mol/L, with lithium hexafluoro phosphate (LiPF6) for lithium salts, ethylene carbonate (EC), propylene carbonate
Ester (PC), dimethyl carbonate (DMC) are solvent, and each solvent quality ratio is 1:1:1.
The embodiment of the present invention has been given in comparative example for the lithium-ion-power cell in above-mentioned specific embodiment
Lithium-ion-power cell, lithium ion power battery cathode pole piece, the dispensing of cathode pole piece, coating process in comparative example,
Coating layer thickness, collector parameter etc. are identical with the lithium-ion-power cell in above-mentioned specific embodiment, and distinctive points only exist
In pole piece rolling process, using the smooth cylindrical roller bearing in surface, under 50 tons of pressure, to positive pole diaphragm two after drying
Face carries out continuous rolling, and using the smooth cylindrical roller bearing in surface, under 15 tons of pressure, to cathode membrane after drying
Two sides carries out continuous rolling.Lithium-ion-power cell system in the Making programme of lithium-ion-power cell and above-mentioned specific embodiment
Make flow process consistent.
Lithium-ion-power cell in above-mentioned specific embodiment is carried out with the lithium-ion-power cell in comparative example
High rate performance is tested, and test condition is as follows：
(1) under the conditions of room temperature (25 ± 2 DEG C), monomer lithium-ion-power cell is first with 1I1(A) current discharge is to 2.8V,
30min is shelved, then with 1I1(A) electric current constant-current charge to 4.3V when turn constant-voltage charge, be down to 0.05I to charging current1(A) when
Stop charging, after charging, shelve 30min；
(2) and then with 1I1(A) electric current constant-current discharge shelves 30min to 2.8V；
(3) respectively with 1/2I1(A)、1.0I1(A)、2.0I1(A)、3.0I1(A) multiplying power electric current constant-current charge turns to during 4.3V
Constant-voltage charge, is down to 0.05I to charging current1(A) stop charging when, after charging, shelve 30min.Test obtains different multiplying electricity
The charging capacity for flowing down.
The multiplying power of the lithium-ion-power cell in lithium-ion-power cell and comparative example in above-mentioned specific embodiment
The performance test results contrast is as follows：
High rate performance test result contrast from above-mentioned two groups of lithium-ion-power cells is as can be seen that the present invention is embodied as
The high rate performance of the lithium-ion-power cell prepared by the thick electrode pole piece being distributed with uniform double-sided symmetrical groove in example, hence it is evident that
The high rate performance of the lithium-ion-power cell in the comparative example prepared better than the thick electrode pole piece by smooth surface.From above-mentioned
The thick coat electrode plates surface that data are provided in more particularly illustrating the embodiment of the present invention has the groove of given shape,
It is more beneficial for the performance of thick coated electrode pole piece chemical property.The thick wound for applying pole piece processing technology in the embodiment of the present invention
The negative effect that thick pole piece brings not only is overcome newly, while thick pole piece performance is applied and band to improve in avoiding prior art
The various drawbacks come.
The thick coat electrode plates surface provided in the embodiment of the present invention has the groove of given shape, can significantly improve
Battery electrolyte recoverable amount, is conducive to battery long circulating to use；And thick coat electrode plates surface is uniformly distributed specific shape
Shape groove, is conducive to the infiltration and diffusion of electrolyte, improves the discharge and recharge chemical property of battery；While thick coat electrode
Pole piece is uniformly distributed the specific surface area that given shape groove increased pole piece, reduces the polarization in battery charge and discharge process
Electric current density, improves large current charge or low temperature charging cathode pole piece analysis lithium risk, improves the safe handling of battery.This
Scheme of the invention is simple to operate and pole piece hole is easily controlled, and production efficiency is high, and will not lose battery energy density.
The preferred embodiments of the present invention are the foregoing is only, the scope of the claims of the present invention, every utilization is not thereby limited
Equivalent structure or equivalent flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other correlations
Technical field, be included within the scope of the present invention.
Claims (10)
1. a kind of lithium ion battery electrode piece, it is characterised in that include：Collector and coating layer of active substance；The active matter
Matter coating uniform is coated in collector both sides, and the coating layer of active substance surface of the both sides is symmetrically uniformly distributed groove.
2. lithium ion battery electrode piece according to claim 1, it is characterised in that the coating layer of active substance of the both sides
Thickness is 200 μm to 300 μm.
3. lithium ion battery electrode piece according to claim 1, it is characterised in that the groove be cone-shaped groove,
One or more in wedge-shaped impression or square groove；The trench gap scope is 100 μm to 500 μm.
4. lithium ion battery electrode piece according to claim 1, it is characterised in that the collector be metal aluminum foil,
One kind in metal copper foil, conductive coating aluminium foil or conductive coating Copper Foil.
5. lithium ion battery electrode piece according to claim 1, it is characterised in that the groove is by specific boss roll shaft
Roll-in or specific boss flat board are colded pressing and are prepared from.
6. a kind of pole piece rolling device, it is characterised in that include：The equally distributed boss of roll shaft and roll shaft surface；The roller
Axle surface is uniformly distributed boss, and during roll-in pole piece, on the coating layer of active substance surface of the pole piece both sides, symmetrically roll-in goes out
Groove is uniformly distributed symmetrically.
7. pole piece rolling device according to claim 6, it is characterised in that the equally distributed boss in the roll shaft surface is
One or more in conical boss, wedge shape boss or square boss；The boss interstice coverage is 100 μm to 500 μm.
8. a kind of lithium ion battery, including：Anode pole piece, cathode pole piece, isolating membrane, shell and electrolyte, it is characterised in that
The coating layer of active substance surface of the anode pole piece both sides is symmetrically uniformly distributed groove；The active matter of the cathode pole piece both sides
Matter coating surface is uniformly distributed groove.
9. lithium ion battery according to claim 8, it is characterised in that the collector of the anode pole piece is metallic aluminium
Paper tinsel, the aluminum foil thickness are 10 μm to 15 μm；The collector of the cathode pole piece is metal copper foil, and the copper thickness is 6 μm
To 10 μm；The anode pole piece, the coating layer of active substance of cathode pole piece both sides are 200 μm to 300 μm.
10. lithium ion battery according to claim 8, it is characterised in that the anode pole piece positive active material, conduction
Agent, the mass ratio of binding agent are 93～97:2～5:1～3；The cathode pole piece negative electrode active material, conductive agent, binding agent matter
Amount is than being 91～95:2～5:3～6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710026308.7A CN106531961B (en) | 2017-01-13 | 2017-01-13 | Lithium ion battery electrode piece, pole piece rolling device and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710026308.7A CN106531961B (en) | 2017-01-13 | 2017-01-13 | Lithium ion battery electrode piece, pole piece rolling device and lithium ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106531961A true CN106531961A (en) | 2017-03-22 |
| CN106531961B CN106531961B (en) | 2019-07-23 |
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| CN201710026308.7A Active CN106531961B (en) | 2017-01-13 | 2017-01-13 | Lithium ion battery electrode piece, pole piece rolling device and lithium ion battery |
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