CN109950467A - A kind of preparation method that pole piece table applies, the pole piece and lithium ion battery applied with table - Google Patents
A kind of preparation method that pole piece table applies, the pole piece and lithium ion battery applied with table Download PDFInfo
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- CN109950467A CN109950467A CN201910233859.XA CN201910233859A CN109950467A CN 109950467 A CN109950467 A CN 109950467A CN 201910233859 A CN201910233859 A CN 201910233859A CN 109950467 A CN109950467 A CN 109950467A
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- pole piece
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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 preparation method applied the present invention provides a kind of pole piece table, the pole piece and lithium ion battery that are applied with table, the following steps are included: table is applied slurry coated on the release layer of release film by (1), table applies slurry and forms top coat on the surface of release layer the preparation method that the pole piece table applies；(2) pole piece will be transferred to coated on the top coat on release layer in advance by hot pressing transfer device.The present invention prepares the painting of battery pole piece table using dry method hot pressing transfer method, the method that wet coating table applies again after alternative traditional pole piece rolls, it avoids during traditional coating table applies, table applies the small molecules such as the solvent in slurry and causes to damage to pole piece activity nitride layer, also avoid the mechanical damage of pole piece, the coating efficiency and yield for improving table painting, reduce VOC emission, shorten the manufacturing cycle of pole piece, battery.
Description
Technical field
The invention belongs to technical field of lithium ion, the preparation method applied more particularly, to a kind of pole piece table has table
The pole piece and lithium ion battery of painting.
Background technique
Lithium ion battery long service life, operating voltage is high, and energy density is big, has a safety feature and is widely used in society
Every field.Electric automobiles in recent years constantly promote the demand of lithium ion battery energy density, high-energy density, height
It is more and more harsh that rate charge-discharge, high security, injecting electrolytic solution amount such as constantly reduce at the demands, positive and negative anodes especially silicon-carbon system
Low thermal expansion also put forward higher requirements.
For lithium ion battery after multiple charge and discharge cycles, positive and negative anodes can all have a different degrees of expansion, expand it is excessive for
Battery capacity performance, circulation, high temperature performance, security performance etc. seriously affect.In the industry by positive and negative anodes pole piece activity
Object surface coats an insulating coating, such as ceramic coating inhibits the excessive expansion of positive and negative anodes by the intensity of insulating coating itself
Rebound, has the effect of certain.
A kind of method for preparing pole piece table and applying more ceramic of compact coating of the Chinese patent of Publication No. CN107565089A
And battery, the method in pole piece setting ceramic of compact coating is mentioned to inhibit the expansion of pole piece to rebound.
Chinese patent electrodes of lithium-ion batteries, battery and the high battery security method of Publication No. CN02222787A, mentions
Security performance, cycle performance and the big multiplying power discharging of lithium ion battery are improved to the insulating layer of positive electrode surface coating specific thicknesses
Performance etc..
Chinese patent positive plate of Publication No. CN107681113A and preparation method thereof and secondary cell, using nanometer
Inorganic oxide ceramic material is coated on positive electrode active material surface and forms porous mineral film layer, to improve security performance and follow
Ring performance.
Chinese patent based lithium-ion battery positive plate of Publication No. CN107437623A and preparation method thereof, discloses just
Pole active matter surface setting interval convex conducting polymer coating, forms support frame, so that pole between pole piece and isolation film
There are buffer gaps between piece and isolation film, create cushion space to the pole piece that swelling stress in cyclic process is concentrated, can be effective
The swelling stress of pole piece during release cycle, torsional deformation caused by reducing because of pole piece expansion, improves the peace of lithium ion battery
Full performance and cycle life.
In conventional solution, table painting is all that table painting slurry is directly coated on positive or negative pole by wet coating mode
In active nitride layer, table, which applies the small molecules such as organic solvent, moisture, additive present in slurry, can penetrate into active nitride layer, influence to live
Property nitride layer in binder, conductive agent arrangement, or in active nitride layer hole exist residual, to cause difference to pole piece performance
The influence of degree brings uncertain influence to circulating battery, high rate performance；Usual table painting thickness is all relatively thin, generally
0.5-5 μm etc., pole piece subject to damage during being coated with table and applying, slurry solid content is lower than 40%, and coating speed is lower than 40m/
Min, coating process mode select to be restricted, and virtually increase the consumption of VOC emission and the energy, limit coating yield
It is promoted.The coating of traditional table is carried out after the completion of pole piece rolls, and it is inevitable that this mode inferior pole piece production cycle, which extends,.
Summary of the invention
In view of this, the present invention is directed to propose a kind of preparation method of pole piece table painting, the pole piece and lithium ion that are applied with table
Battery, the method that wet coating table applies again after the alternative traditional pole piece of preparation method which applies rolls, avoids biography
During system coating table applies, table applies the small molecules such as the solvent in slurry and causes to damage to pole piece activity nitride layer, also avoids pole piece
Mechanical damage, improve table painting coating efficiency and yield, reduce VOC emission, shorten pole piece, battery manufacture week
Phase.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of preparation method that pole piece table applies, comprising the following steps:
(1) it is coated with table on release film to apply: table is applied into slurry and is coated on the release layer of release film, table applies slurry in release layer
Surface formed top coat, top coat and release film composition have top coat release film；
(2) top coat hot pressing is shifted: being provided with hot pressing transfer device between pole piece rolling machine and pole piece winding machine, is passed through heat
Top coat in step (1) is transferred to the surface of the pole piece after rolling by pressure transfer device, obtains the pole piece that there is table to apply.
Further, the hot pressing transfer device in step (2) includes the upper hot pressing transfer above the pole piece after rolling
Lower hot pressing transfer device below device, the pole piece after rolling, upper hot pressing transfer device and lower hot pressing transfer device are symmetrical
Setting, upper hot pressing transfer device include upper let off roll, the upper pressure roller, upper receipts that the direction of motion of the pole piece after rolling is set gradually
Winding up roller, lower hot pressing transfer device include lower let off roll, the lower compression roller, lower receipts that the direction of motion of the pole piece after rolling is set gradually
Winding up roller, upper hot pressing transfer device and lower hot pressing transfer device shift top coat to the two sides hot pressing simultaneously of the pole piece after rolling, and grind
The lower section of pole piece after pressure is equipped with the first transfer roller and the second transfer roller for transmitting the pole piece after rolling.
Further, Deviation rectifier and upper spreader roll, upper pressure roller and upper receipts are successively arranged between upper let off roll and upper pressure roller
Machine speed sensor and upper deflector roll are successively arranged between winding up roller；Lower be equipped between let off roll and lower compression roller is successively arranged lower Deviation rectifier
With lower spreader roll, lower machine speed sensor and lower guide roll are successively arranged between lower compression roller and lower wind-up roll.
By adopting the above technical scheme, upper Deviation rectifier and lower Deviation rectifier prevent material sideslip, upper machine speed sensor and lower machine speed
The speed of sensor examinations material.
Further, upper pressure roller is identical with the diameter of lower compression roller, is 100-500mm, the material of upper pressure roller and lower compression roller
For any one in metal, nylon, silica gel.
Further, the top coat in step (1) is transferred to the surface of the pole piece after rolling by hot pressing transfer device
Specific steps are as follows:
Pole piece after rolling is placed on the first transfer roller and the second transfer roller, the pole piece after rolling is to pole piece winding machine
Direction movement；
The release film with top coat that step (1) obtains is wound on upper let off roll, top coat, which is located remotely from, to be unreeled
The side of roller, the release film with top coat successively passes through upper Deviation rectifier, upper spreader roll, upper pressure roller, by the hot pressing of upper pressure roller
Afterwards, under heat and pressure, top coat is stripped down from release layer, shifts and be bonded to the surface of the pole piece after rolling,
The pole piece that there is table to apply and the release film without top coat are obtained, is successively passed by upper machine speed without the release film of top coat
Sensor, upper deflector roll, are finally wound on wind-up roll with recycling and reusing；
The release film with top coat that step (1) obtains is wound on lower let off roll, top coat, which is located remotely from down, to be unreeled
The side of roller, the release film with top coat successively passes through lower Deviation rectifier, lower spreader roll, lower compression roller, by the hot pressing of lower compression roller
Afterwards, under heat and pressure, top coat is stripped down from release layer, shifts and be bonded to the surface of the pole piece after rolling,
The pole piece that there is table to apply and the release film without top coat are obtained, is successively passed by lower machine speed without the release film of top coat
Sensor, lower guide roll are finally wound on lower wind-up roll with recycling and reusing；
Upper hot pressing transfer device, lower hot pressing transfer device, pole piece rolling machine keep linkage.
Further, the rolling pressure of upper pressure roller and lower compression roller is 0.1-0.6MPa, the surface temperature of upper pressure roller and lower compression roller
Degree is 20-150 DEG C.
Further, table applies solid content >=50% of slurry in step (1), and table applies slurry and applied by the method for wet coating
It is overlying on the release layer of release film.
Further, the substrate of release film be PET film, PET film with a thickness of 10-25 μm, between top coat and release layer
Peel strength be 0.1-2N/m, the peel strength of release layer and PET film is 20-100N/m, top coat with roll after pole piece
Between peel strength be 10-100N/m.
Preferably, when reusing 10 times without the release film of top coat, the removing between top coat and release layer is strong
Degree is 0.1-2N/m.
The present invention also provides the pole pieces of a kind of preparation method production applied using above-mentioned pole piece table applied with table.
The present invention also provides a kind of lithium ion batteries using the above-mentioned pole piece applied with table.
Compared with the existing technology, the preparation method of pole piece table painting of the present invention, the pole piece and lithium ion that are applied with table
Battery has the advantage that
By hot pressing transfer device pole piece activity nitride layer will be transferred to coated on the top coat (see Fig. 2) on release layer in advance
Surface obtains the pole piece that there is required table to apply, and during avoiding traditional coating table painting, solvent, additive in slurry etc. are small
Molecule causes to damage to pole piece activity nitride layer, also avoids the mechanical damage of pole piece, improves coating efficiency and yield that table applies；Cause
PET film has good mechanical property, temperature tolerance, dimensional stability and higher tensile strength, it is thus possible to improve dry temperature
Degree realizes high-speed coating；Slurry is applied by wet coating mode using the table of high solids content simultaneously, reaches reduction VOC emission, is dropped
The purpose of low energy expenditure；By being reintegrated to pole piece production procedure, comparison diagram 3 and Fig. 4, it is known that side of the present invention
Method shortens the manufacturing cycle of pole piece, battery.
The pole piece table of method preparation of the present invention applies mechanical strength with higher and the good bonding of active nitride layer
Intensity can inhibit pole piece expansion rebound, improve liquid-keeping property, improve security and stability, the cycle performance of lithium ion battery.
Detailed description of the invention
Fig. 1 is the overall structure diagram of hot pressing transfer device of the present invention；
Fig. 2 is the structural schematic diagram of the release film of the present invention with top coat；
Fig. 3 is the flow chart of traditional pole piece table coating preparation method；
Fig. 4 is the flow chart of pole piece table coating preparation method of the present invention；
Fig. 5 is the top coat for the positive plate that embodiment 1 of the present invention is prepared and the section SEM of active nitride layer
Figure；
Fig. 6 is the surface SEM figure of the top coat for the positive plate that embodiment 1 of the present invention is prepared；
Fig. 7 is the high temperature cyclic performance test knot for the battery being prepared in each embodiment of the present invention and comparative example
Fruit.
Wherein attached drawing mark is described as follows:
1, the pole piece after rolling；11, collector；12, active nitride layer；13, the top coat being transferred in active nitride layer；2, band
There is the release film of top coat；20, PET film；21, release layer；22, top coat；23, without the release film of top coat；3, have
The pole piece that table applies；30, the first transfer roller；31a, upper let off roll；31b, lower let off roll；32a, upper spreader roll；32b, lower spreader roll；
33a, upper pressure roller；33b, lower compression roller；34a, upper deflector roll；34b, lower guide roll；35a, upper wind-up roll；35b, lower wind-up roll；36, second
Transfer roller；41a, upper Deviation rectifier；41b, lower Deviation rectifier；42a, upper machine speed sensor；42b, lower machine speed sensor.
Specific embodiment
In addition to being defined, technical term used in following embodiment has universal with those skilled in the art of the invention
The identical meanings of understanding.Test reagent used in following embodiment is unless otherwise specified conventional biochemical reagent；It is described
Experimental method is unless otherwise specified conventional method.
Below with reference to examples and drawings, the present invention will be described in detail.
Embodiment 1
Prepare the positive plate for being coated with positive electrode, the table that solid content is 50% is applied into slurry, is applied with the machine speed of 60m/min
Be distributed on release film, obtain the required release film 2 with top coat, top coat 22 with a thickness of 1.5 μm.Wherein, release layer
21 with the peel strength of PET film 20 be 21N/m, and the peel strength between top coat 22 and release layer 21 is 0.1N/m.Such as Fig. 1 institute
Show, the positive plate being coated with is loaded on the unwinding device of pole piece rolling machine；The release film 2 of top coat will be had (see Fig. 2)
It is loaded on the upper let off roll 31a and lower let off roll 31b of hot pressing transfer device, top coat 22 is located at close to the side of pole piece；Heat
The upper pressure roller 33a and lower compression roller 33b of transfer device is pressed to use metal smooth roll, the temperature on surface is set as 20 DEG C；Start pole piece to grind
Press, the positive plate after rolling enter hot pressing transfer device, while starting hot pressing transfer device, the release film 2 with top coat
Pressure roller 33a and lower compression roller 33b, pressure are set as 0.1Mpa in pressing, and after upper pressure roller 33a and lower compression roller 33b pressing, table is applied
Layer 22 is stripped down from release layer 21, completely shifts and be bonded in 12 surface of positive-active nitride layer, obtains that there is table to apply just
Pole piece B, the top coat 22 being transferred in active nitride layer 12 are shown in Fig. 1.Keep sample, tests 22 peel strength of top coat, exterior appearance, thickness
Degree etc..The positive plate B applied with table and negative electrode tab A0 is melted by punching, lamination, welding, fluid injection, encapsulation, preliminary filling, high temperature,
Partial volume obtains lithium ion battery.Test safety, the cycle performance of obtained lithium ion battery.
As shown in Figure 1, the pole piece 1 after rolling in step (2) includes collector 11, the two sides coating of collector 11 is active
Nitride layer 12.
As shown in figure 4, the flow chart of pole piece table coating preparation method of the invention；As shown in figure 3, traditional pole piece table coats
The flow chart of Preparation Method.Comparison diagram 3 and Fig. 4, it is known that method of the present invention shortens the manufacturing cycle of pole piece, battery.
As shown in figure 5, scheming for the obtained top coat 22 of positive plate and the section SEM of active nitride layer 12, the upper left corner is table
Coating 22, the lower right corner are active nitride layer 12, it can be seen that top coat 22 is complete and is entirely coated in the surface of active nitride layer 12.
As shown in fig. 6, the surface SEM figure of the top coat 22 for obtained positive plate, it can be seen that the surface of top coat 22
Very smooth and no breakage.
Embodiment 2
Prepare the negative electrode tab for being coated with negative electrode material, the table that solid content is 55% is applied into slurry, is applied with the machine speed of 80m/min
Be distributed on release film, obtain the required release film 2 with top coat, top coat 22 with a thickness of 2 μm.Wherein, release layer 21
Peel strength with PET film 20 is 23N/m, and the peel strength between top coat 22 and release layer 21 is 0.3N/m.Such as Fig. 1 institute
Show, the negative electrode tab being coated with is loaded on the unwinding device of pole piece rolling machine；The release film 2 of top coat will be had (see Fig. 2)
It is loaded on the upper let off roll 31a and lower let off roll 31b of hot pressing transfer device, top coat 22 is located at close to the side of pole piece；Heat
The upper pressure roller 33a of transfer device is pressed to use metal smooth roll, lower compression roller 33b uses silica gel roller, and the temperature on the surface upper pressure roller 33a is set
It is 30 DEG C, the temperature on the surface lower compression roller 33b is set as 50 DEG C；Start pole piece rolling machine, the negative electrode tab after rolling enters hot pressing and turns
Moving device, while starting hot pressing transfer device, the release film 2 with top coat presses upper pressure roller 33a and lower compression roller 33b, pressure
It is set as 0.2Mpa, after upper pressure roller 33a and lower compression roller 33b pressing, top coat 22 is stripped down from release layer 21, completely
12 surface of negative electrode active nitride layer is shifted and be bonded in, the negative electrode tab C that there is table to apply is obtained.Keep sample, test top coat 22 is removed by force
Degree, exterior appearance, thickness etc..Positive plate B0 and negative electrode tab C is passed through into punching, lamination, welding, fluid injection, encapsulation, preliminary filling, high temperature
Chemical conversion, partial volume obtain lithium ion battery.Test safety, the cycle performance of obtained lithium ion battery.
Embodiment 3
Prepare the negative electrode tab for being coated with negative electrode material, the table that solid content is 60% is applied into slurry, with the machine speed of 100m/min
Be coated on release film, obtain the required release film 2 with top coat, top coat 22 with a thickness of 3 μm.Wherein, release layer
21 with the peel strength of PET film 20 be 20N/m, and the peel strength between top coat 22 and release layer 21 is 0.5N/m.Such as Fig. 1 institute
Show, the negative electrode tab being coated with is loaded on the unwinding device of pole piece rolling machine；The release film 2 of top coat will be had (see Fig. 2)
It is loaded on the upper let off roll 31a and lower let off roll 31b of hot pressing transfer device, top coat 22 is located at close to the side of pole piece；Heat
The upper pressure roller 33a and lower compression roller 33b of transfer device is pressed to use nylon roller, the temperature on surface is set as 70 DEG C；Starting pole piece rolls
Machine, the negative electrode tab after rolling enter hot pressing transfer device, while starting hot pressing transfer device, and the release film 2 with top coat is pressed
Pressure roller 33a and lower compression roller 33b are closed, pressure is set as 0.3Mpa, after upper pressure roller 33a and lower compression roller 33b pressing, top coat
22 strip down from release layer 21, completely shift and be bonded in 12 surface of negative electrode active nitride layer, obtain the cathode that there is table to apply
Piece D.Keep sample, test 22 peel strength of top coat, exterior appearance, thickness etc..By positive plate B0 and negative electrode tab D by being punched, folding
Piece, welding, fluid injection, encapsulation, preliminary filling, high temperature chemical conversion, partial volume obtain lithium ion battery.Test the peace of obtained lithium ion battery
Entirely, cycle performance.
Embodiment 4
Prepare the negative electrode tab for being coated with negative electrode material, the table that solid content is 60% is applied into slurry, is applied with the machine speed of 80m/min
Be distributed on release film, obtain the required release film 2 with top coat, top coat 22 with a thickness of 5 μm.Wherein, release layer 21
Peel strength with PET film 20 is 20N/m, and the peel strength between top coat 22 and release layer 21 is 0.8N/m.Such as Fig. 1 institute
Show, the negative electrode tab being coated with is loaded on the unwinding device of pole piece rolling machine；The release film 2 of top coat will be had (see Fig. 2)
It is loaded on the upper let off roll 31a and lower let off roll 31b of hot pressing transfer device, top coat 22 is located at close to the side of pole piece；Heat
The upper pressure roller 33a and lower compression roller 33b of transfer device is pressed to use silica gel roller, the temperature on surface is set as 120 DEG C；Starting pole piece rolls
Machine, the negative electrode tab after rolling enter hot pressing transfer device, while starting hot pressing transfer device, and the release film 2 with top coat is pressed
Pressure roller 33a and lower compression roller 33b are closed, pressure is set as 0.4Mpa, after upper pressure roller 33a and lower compression roller 33b pressing, top coat
22 strip down from release layer 21, completely shift and be bonded in 12 surface of negative electrode active nitride layer, obtain the cathode that there is table to apply
Piece E.Keep sample, test 22 peel strength of top coat, exterior appearance, thickness etc..By positive plate B0 and negative electrode tab E by being punched, folding
Piece, welding, fluid injection, encapsulation, preliminary filling, high temperature chemical conversion, partial volume obtain lithium ion battery.Test the peace of obtained lithium ion battery
Entirely, cycle performance.
Embodiment 5
Prepare the negative electrode tab for being coated with negative electrode material, the table that solid content is 65% is applied into slurry, is applied with the machine speed of 80m/min
Be distributed on release film, obtain the required release film 2 with top coat, top coat 22 with a thickness of 4 μm.Wherein, release layer 21
Peel strength with PET film 20 is 20N/m, and the peel strength between top coat 22 and release layer 21 is 1.0N/m.Such as Fig. 1 institute
Show, the negative electrode tab being coated with is loaded on the unwinding device of pole piece rolling machine；The release film 2 of top coat will be had (see Fig. 2)
It is loaded on the upper let off roll 31a and lower let off roll 31b of hot pressing transfer device, top coat 22 is located at close to the side of pole piece；Heat
The upper pressure roller 33a of transfer device is pressed to use silica gel roller, lower compression roller 33b uses nylon roller, and the temperature on the surface upper pressure roller 33a is set as
120 DEG C, the temperature on the surface lower compression roller 33b is set as 110 DEG C；Start pole piece rolling machine, the negative electrode tab after rolling enters hot pressing and turns
Moving device, while starting hot pressing transfer device, the release film 2 with top coat presses upper pressure roller 33a and lower compression roller 33b, pressure
It is set as 0.5Mpa, after upper pressure roller 33a and lower compression roller 33b pressing, top coat 22 is stripped down from release layer 21, completely
12 surface of negative electrode active nitride layer is shifted and be bonded in, the negative electrode tab F that there is table to apply is obtained.Keep sample, test top coat 22 is removed by force
Degree, exterior appearance, thickness etc..Positive plate B0 and negative electrode tab F is passed through into punching, lamination, welding, fluid injection, encapsulation, preliminary filling, high temperature
Chemical conversion, partial volume obtain lithium ion battery.Test safety, the cycle performance of obtained lithium ion battery.
Comparative example 1
Positive plate B0, the negative electrode tab A0 after being coated with, rolling, by punching, lamination, welding, note after preparing coating, rolling
Liquid, encapsulation, preliminary filling, high temperature chemical conversion, partial volume obtain lithium ion battery.
Comparative example 2
Positive plate B0, the negative electrode tab A0 after being coated with, rolling after preparing coating, rolling.By the table pasting of 30% solid content
Material is coated on negative electrode tab A0, and dry coating thickness is 3.8 μm, obtains the negative electrode tab A1 that there is table to apply；By positive plate B0 and cathode
Piece A1 obtains lithium ion battery by punching, lamination, welding, fluid injection, encapsulation, preliminary filling, high temperature chemical conversion, partial volume.
Comparative example 3
Positive plate B0 after preparing coating, rolling, the negative electrode tab A0 being coated with after rolling.The table of 30% solid content is applied into slurry
It is coated on positive plate B0, dry coating thickness is 1.5 μm, obtains the positive plate B1 that there is table to apply；By positive plate B1 and negative electrode tab
A0 obtains lithium ion battery by punching, lamination, welding, fluid injection, encapsulation, preliminary filling, high temperature chemical conversion, partial volume.
Test example 1
The physicochemical property for the pole piece that each embodiment and comparative example are prepared is detected, detection data is shown in Table 1.
The physicochemical property for the pole piece that each embodiment of table 1 and comparative example are prepared
As shown in Table 1, the pole piece and lithium applied with table being prepared using the preparation method that pole piece table of the invention applies
Ion battery, in the case where processing technology is shifted in different hot pressing, the rebound of the pole piece obtained applied with table reduces, with top coat
It is the increase of thickness, the intensity of top coat increases, and rebound effect is inhibited to improve；In the case of same thickness, comparative example 3 and reality are compared
Apply example 1 (in terms of improving cathode rebound), comparative example 2 and embodiment 5 (in terms of improving cathode rebound), pole piece table of the invention
The preparation method of painting is lower than the pole piece rebound amount applied with table that the preparation method that traditional pole piece table applies is prepared.
Test example 2
Needle thorn experiment is carried out to the lithium ion battery being prepared in each embodiment and comparative example, the results are shown in Table 2.
The needle for the lithium ion battery that each embodiment of table 2 and comparative example are prepared pierces experimental data
As shown in Table 2, smoke event on fire does not occur for embodiment 1-5 and comparative example 2-3, and maximum temperature is no more than 150
DEG C, and lithium ion battery keeps stablizing in the whole process, it is prepared by the lithium ion battery and conventional method that the present invention is prepared
Obtain lithium ion battery showed in terms of safety quite illustrate to apply using table of the invention lithium that positive/negative plate is prepared from
Security performance of the sub- battery in pin prick test is improved.
Test example 3
The high temperature cyclic performance for the lithium ion battery that each embodiment and comparative example are prepared is tested, test result
See Fig. 7.
Test condition: 45 DEG C, 1C-1C circulation.
As shown in Figure 7, the lithium ion battery that embodiment 1-5 is prepared in cyclic process, capacity retention ratio relative to
Comparative example 1 is improved.Reach and has improved cycle performance of lithium ion battery in the surface of pole piece activity nitride layer setting top coat
Purpose.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. the preparation method that a kind of pole piece table applies, it is characterised in that: the following steps are included:
(1) it is coated with table on release film to apply: table is applied into slurry and is coated on the release layer (21) of release film, table applies slurry in release layer
(21) surface forms top coat (22), the release film (2) of top coat (22) and release film composition with top coat；
(2) top coat hot pressing is shifted: being provided with hot pressing transfer device between pole piece rolling machine and pole piece winding machine, is turned by hot pressing
Top coat (22) in step (1) is transferred to the surface of the pole piece after rolling (1) by moving device, obtains the pole piece that there is table to apply
(3)。
2. the preparation method that pole piece table according to claim 1 applies, it is characterised in that: dress is shifted in the hot pressing in step (2)
It sets including the upper hot pressing transfer device above the pole piece (1) after rolling, the lower hot pressing below the pole piece (1) after rolling
Transfer device, upper hot pressing transfer device and lower hot pressing transfer device are symmetrical arranged, and upper hot pressing transfer device includes after rolling
Upper let off roll (31a) that the direction of motion of pole piece (1) is set gradually, upper pressure roller (33a), upper wind-up roll (35a), lower hot pressing transfer
Device includes lower let off roll (31b), the lower compression roller (33b), lower winding that the direction of motion of the pole piece (1) after rolling is set gradually
Hot pressing transfer table applies simultaneously on the two sides of roller (35b), upper hot pressing transfer device and lower hot pressing transfer device to the pole piece (1) after rolling
Layer (22), the lower section of the pole piece (1) after rolling are equipped with the first transfer roller (30) and second for transmitting the pole piece (1) after rolling
Transfer roller (36).
3. the preparation method that pole piece table according to claim 2 applies, it is characterised in that: upper let off roll (31a) and upper pressure roller
Deviation rectifier (41a) and upper spreader roll (32a) are successively arranged between (33a), between upper pressure roller (33a) and upper wind-up roll (35a)
It is successively arranged machine speed sensor (42a) and upper deflector roll (34a)；It is equipped with successively between lower let off roll (31b) and lower compression roller (33b)
Equipped with lower Deviation rectifier (41b) and lower spreader roll (32b), lower machine speed is successively arranged between lower compression roller (33b) and lower wind-up roll (35b)
Sensor (42b) and lower guide roll (34b).
4. the preparation method that pole piece table according to claim 3 applies, it is characterised in that: upper pressure roller (33a) and lower compression roller
The diameter of (33b) is identical, is 100-500mm, and the material of upper pressure roller (33a) and lower compression roller (33b) is metal, nylon, silica gel
One of.
5. the preparation method that pole piece table according to claim 4 applies, it is characterised in that: by hot pressing transfer device by step
(1) top coat (22) in is transferred to the specific steps on the surface of the pole piece after rolling (1) are as follows:
Pole piece after rolling (1) is placed on the first transfer roller (30) and the second transfer roller (36), the pole piece (1) after rolling to
The movement of pole piece winding machine direction；
The release film (2) with top coat that step (1) obtains is wound on upper let off roll (31a), top coat (22) is located at remote
Side from upper let off roll (31a), the release film (2) with top coat successively pass through upper Deviation rectifier (41a), upper spreader roll
(32a), upper pressure roller (33a), after the hot pressing of upper pressure roller (33a), under heat and pressure, top coat (22) is from release layer
(21) stripped down on, shift and be bonded to the surface of the pole piece after rolling (1), the pole piece (3) that obtains having table to apply and without
There is the release film (2) of top coat, successively passes through upper machine speed sensor (42a), upper deflector roll without the release film (2) of top coat
(34a) is finally wound on wind-up roll (35a) with recycling and reusing；
The release film (2) with top coat that step (1) obtains is wound on lower let off roll (31b), top coat (22) is located at remote
Side from lower let off roll (31b), the release film (2) with top coat successively pass through lower Deviation rectifier (41b), lower spreader roll
(32b), lower compression roller (33b), after the hot pressing of lower compression roller (33b), under heat and pressure, top coat (22) is from release layer
(21) stripped down on, shift and be bonded to the surface of the pole piece after rolling (1), the pole piece (3) that obtains having table to apply and without
There is the release film (2) of top coat, successively passes through lower machine speed sensor (42b), lower guide roll without the release film (2) of top coat
(34b) is finally wound on lower wind-up roll (35b) with recycling and reusing；
Upper hot pressing transfer device, lower hot pressing transfer device, pole piece rolling machine keep linkage.
6. the preparation method that pole piece table according to claim 5 applies, it is characterised in that: upper pressure roller (33a) and lower compression roller
The rolling pressure of (33b) is 0.1-0.6MPa, and the surface temperature of upper pressure roller (33a) and lower compression roller (33b) is 20-150 DEG C.
7. the preparation method that pole piece table according to claim 1 applies, it is characterised in that: table applies consolidating for slurry in step (1)
Content >=50%, table apply slurry and are coated on the release layer (21) of release film by the method for wet coating.
8. the preparation method that pole piece table according to claim 1 applies, it is characterised in that: the substrate of release film is PET film
(20), PET film (20) with a thickness of 10-25 μm, peel strength between top coat (22) and release layer (21) is 0.1-2N/m,
The peel strength of release layer (21) and PET film (20) is 20-100N/m, between top coat (22) and pole piece (1) after rolling
Peel strength is 10-100N/m.
9. a kind of pole piece of the preparation method production applied using pole piece table described in above-mentioned any one applied with table.
10. a kind of lithium ion battery using the pole piece as claimed in claim 9 applied with table.
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| CN201910233859.XA CN109950467B (en) | 2019-03-26 | 2019-03-26 | Preparation method of pole piece surface coating, pole piece with surface coating and lithium ion battery |
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| CN112038576A (en) * | 2020-09-28 | 2020-12-04 | 合肥国轩高科动力能源有限公司 | Electrode, manufacturing method thereof and lithium ion battery comprising electrode |
| CN112802987A (en) * | 2020-12-31 | 2021-05-14 | 蜂巢能源科技有限公司 | Method for preparing electrode slice by dry rolling |
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| CN109950467B (en) | 2022-05-10 |
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