CN107394116A - One kind has high rate capability lithium ion battery and preparation method thereof - Google Patents
One kind has high rate capability lithium ion battery and preparation method thereof Download PDFInfo
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- CN107394116A CN107394116A CN201710464806.XA CN201710464806A CN107394116A CN 107394116 A CN107394116 A CN 107394116A CN 201710464806 A CN201710464806 A CN 201710464806A CN 107394116 A CN107394116 A CN 107394116A
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- active material
- lithium ion
- conductive agent
- 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
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The present invention relates to the preparation method with high rate capability lithium ion battery, comprise the following steps：It is 1.0~1.5 microns of active material as active material of cathode to use particle diameter D50, and the active material of cathode, conductive agent and bonding agent are mixed with solvent, and by being dispersed with stirring obtained cathode size；The cathode size is coated to dry on collector according to unit area coat weight for 255 ± 5g/ ㎡ negative plate is made；It is 8.0~8.5 microns of active material as active material of positive electrode to use particle diameter D50, the active material of positive electrode, conductive agent and bonding agent is mixed with solvent, by being dispersed with stirring obtained anode sizing agent；The anode sizing agent is coated to dry on collector according to unit area coat weight for 121 ± 5g/ ㎡ positive plate is made；The conductive agent includes tube bank conductive agent and granular conductive agent；The negative plate, the positive plate and barrier film are assembled and to form battery.Have the advantages that the charging interval is short, high rate performance is superior using battery made from this method.
Description
Technical field
The present invention relates to field of lithium ion battery, more specifically to a kind of lithium-ion electric with high rate capability
Pond and preparation method thereof.
Background technology
At present, lithium ion battery has been widely used for the various fields such as electric tool, electric automobile, power network energy storage, with
The development of removable electric tool and other high rate charge-discharge articles for use and the enhancing of environmental consciousness, for high rate charge-discharge
Battery from the common batteries of ni-mh and NI-G rapidly to higher energy density and environmental protection lithium ion battery transformation.In recent years
Come, lithium ion battery is in explosive growth in automobile-used field.
At present, rate lithium ion battery proportion in whole industry is smaller, and problem is：Lithium ion battery charge and discharge
Electric current is less than normal, the time is longer；High current quick charge can not be born；During high current quick charge, lithium ion can not have
The insertion anode of effect, cause to analyse lithium, so as to reduce the service life of battery.
The content of the invention
The technical problem to be solved in the present invention is, there is provided a kind of preparation method of feasible improvement battery high rate performance with
And lithium ion battery obtained by this method.
The technical solution adopted for the present invention to solve the technical problems is：Construction one kind has high rate capability lithium-ion electric
The preparation method in pond；Comprise the following steps：
S1, prepare negative plate：The active material that particle diameter D50 is 1.0~1.5 microns is used to be incited somebody to action as active material of cathode
The active material of cathode, conductive agent and bonding agent mix with solvent, and by being dispersed with stirring obtained cathode size；By described in
Cathode size is that 255 ± 5g/ ㎡ are coated to the obtained negative plate of drying on collector according to unit area coat weight；The conduction
Agent includes tube bank conductive agent and granular conductive agent；
S2, prepare positive plate：The active material that particle diameter D50 is 8.0~8.5 microns is used to be incited somebody to action as active material of positive electrode
The active material of positive electrode, conductive agent and bonding agent mix with solvent, and by being dispersed with stirring obtained anode sizing agent；By described in
Anode sizing agent is that 121 ± 5g/ ㎡ are coated to the obtained positive plate of drying on collector according to unit area coat weight；The conduction
Agent includes tube bank conductive agent and granular conductive agent；
S3, prepare battery：The negative plate, the positive plate and barrier film are assembled and to form battery.
Preferably, in S1 steps, the mass ratio of the active material of cathode, the conductive agent and the binding agent
For：Active material of cathode 94%-98%, conductive agent 0.5%-3.0%, bonding agent 1.5%-3.0%.
Preferably, in S1 steps, the active material of cathode is the LiFePO4 that particle diameter D50 is 1.0~1.5 microns；
The tube bank conductive agent is KS-6, and the solvent is 1-METHYLPYRROLIDONE.
Preferably, in S2 steps, the mass ratio of the active material of positive electrode, the conductive agent and the binding agent
For：Active material of cathode 94%-98%, conductive agent 0.5%-3.0%, bonding agent 1.5%-3.0%.
Preferably, in S1 steps, the active material of cathode is that the particle diameter D50 obtained by improvement is 8.0~8.5 micro-
The Delanium of rice；The tube bank conductive agent is KS-6；The solvent is 1-METHYLPYRROLIDONE.
Preferably, in S3 steps, the interlamellar spacing being made up of in the battery negative electrode, anode and barrier film is micro- for 209 ± 1
Rice.
Preferably, the S1 steps comprise the following steps：
S1.1, weigh by formula rate the active material of cathode, the conductive agent and the binding agent and same with solvent
When be put into mixer, be mixed to prepare negative pole premix slurry；
S1.2, all negative poles premix slurry is added in mixer and adjusts mixing speed；
S1.3, will complete the slurry after the step S1.2 carry out it is scattered at a high speed；
S1.4, the slurry after the step S1.3 will be completed vacuumize de-bubble, negative electrode of lithium ion battery is made in sieving discharging
Slurry；
S1.5, the cathode size is coated on collector according to unit area coat weight for 255 ± 5g/ ㎡ and dried
Negative plate is made.
Preferably, the S2 steps comprise the following steps：
S2.1, weigh by formula rate the active material of positive electrode, the conductive agent and the binding agent and same with solvent
When be put into mixer, be mixed to prepare positive pole premix slurry；
S2.2, all positive poles premix slurry is added in mixer and adjusts mixing speed；
S2.3, will complete the slurry after the step S2.2 carry out it is scattered at a high speed；
Slurry after completing the step S2.3 is vacuumized de-bubble by S2.4, and lithium ion cell positive slurry is made in sieving discharging
Material；
S2.5, by the anode sizing agent according to positive pole unit area coat weight be 121 ± 5g/ ㎡ be coated on collector
Positive plate is made in drying.
Preferably, in S3 steps, comprise the following steps：
Battery core is made in the negative plate, the positive plate, the membrane winding by S3.1；
S3.2, the battery core is put into packaging bag, and injects electrolyte, lithium ion battery is made through secondary encapsulation.
The present invention also construction one kind has high rate capability lithium ion battery, it is characterised in that using of the present invention
Preparation method with high rate capability lithium ion battery is made；It is described that there is high rate capability lithium ion battery to include negative pole
Piece, positive plate and barrier film；The negative plate, the positive plate, the membrane winding into the lithium ion battery battery core.
Implement lithium ion battery with high rate capability of the present invention and preparation method thereof, have the advantages that：
The present invention uses particle diameter D50 as active material of cathode and to use particle diameter D50 as 8.0 for 1.0~1.5 microns of active material
~8.5 microns of active material improves the migration rate of lithium ion as active material of positive electrode, and the present invention will be by the moon
Pole active material, conductive agent and bonding agent mix with solvent, and by being dispersed with stirring obtained cathode size according to unit area
Coat weight is that 255 ± 5g/ ㎡ are coated on collector to dry negative plate is made, and will be by this by the anode activity material
Material, conductive agent and bonding agent mix with solvent, and by being dispersed with stirring obtained anode slurry according to unit area coat weight
It is coated to dry on collector for 121 ± 5g/ ㎡ and positive plate is made, reduces the unit area coat weight of anode and cathode.With
The reduction of the unit area coat weight of anode and cathode, in the case that compacted density is constant, the roll-in thickness of anode and cathode slice is also therewith
Diminish, the interlamellar spacing of negative electrode, anode and barrier film composition is reduced by, and the interlamellar spacing that lithium ion shuttles reduces, so as to improve
The transfer ability of lithium ion；In addition the present invention also uses tubular conductive agent, to improve electronic conduction ability.Tubular conductive agent is uniform
It is dispersed in anode and cathode active material, plays electron bridge beam action, so as to bigger than the conductive capability of general granular conductive agent.
The present invention is by improving inside lithium ion cell lithium ion mobility ability and electronic conduction ability, to improve the fast of lithium ion battery
Fast charge-discharge performance.The battery prepared using the program, has that the charging interval is short, high rate performance is superior, stable cycle performance etc.
Advantage.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the process chart for the preparation method that the present invention has high rate capability lithium ion battery；
Fig. 2 is active material of positive electrode before improving in preparation method of the present invention with high rate capability lithium ion battery
SEM schemes；
Fig. 3 is active material of positive electrode after improving in preparation method of the present invention with high rate capability lithium ion battery
SEM schemes；
Fig. 4 is the SEM figures of tubulose conductive agent in preparation method of the present invention with high rate capability lithium ion battery；
Fig. 5 is the SEM figures of particle conductive agent in preparation method of the present invention with high rate capability lithium ion battery；
Fig. 6 is using the anode activity material after improving in preparation method of the present invention with high rate capability lithium ion battery
The anode and cathode interlamellar spacing variation diagram of lithium ion battery made from material；
Fig. 7 is that the present invention uses 5C constant current charge curve maps before and after the improvement of lithium ion battery made from Fig. 1 methods；
Fig. 8 is that DC internal resistance is closed with cycle-index before and after the present invention uses the improvement of lithium ion battery made from Fig. 1 methods
System's figure；
Fig. 9 is that the present invention uses cyclic curve figure before and after the improvement of lithium ion battery made from Fig. 1 methods.
Embodiment
Fig. 1 shows that the present invention has the preparation method of high rate capability lithium ion battery.
As shown in figure 1, it should comprise the following steps with the preparation method of high rate capability lithium ion battery：
S1, prepare negative plate：The active material that particle diameter D50 is 1.0~1.5 microns is used to be incited somebody to action as active material of cathode
The active material of cathode, conductive agent and bonding agent mix with solvent, and by being dispersed with stirring obtained cathode size；By described in
Cathode size is that 255 ± 5g/ ㎡ are coated to the obtained negative plate of drying on collector according to unit area coat weight.
Wherein, it can be KS-6 that conductive agent, which includes tube bank conductive agent and granular conductive agent, the tube bank conductive agent,；The negative electrode
Active material can be to pass through active material of cathode relatively small the particle diameter D50 obtained after improvement, specifically, the cathode activity
Material can be by improving the LiFePO4 that obtained particle diameter D50 is 1.0~1.5 microns；The solvent can be N- methyl pyrroles
Pyrrolidone；In some other embodiment, the solvent can also be water；The binding agent can select Kynoar, styrene-
One or more in butadiene copolymer, acrylic acid series copolymer, carboxymethyl cellulose and butadiene-styrene rubber.The cathode active material
Material, the mass ratio of the conductive agent and the binding agent are：Active material of cathode 94%-98%, conductive agent 0.5%-3.0%, glue
Meet agent 1.5%-3.0%.The collector can be copper coin.
Specifically, step S1 may include：
S1.1, weigh by formula rate active material of cathode, conductive agent and binding agent and with solvent while being put into mixer
In, it is mixed to prepare negative pole premix slurry.
The mixer wherein used can be twin shaft leaf formula high efficient mixer, and incorporation time can be 3-5min.
S1.2, all negative poles premix slurry is added in mixer and adjusts mixing speed.
Wherein, the mixer revolution speed is≤15rpm, rotational velocity≤1000rpm, mixing time≤60min.
S1.3, will complete the slurry after step S1.2 carry out it is scattered at a high speed.
In this step, can be disperseed using high speed dispersor, the rotating speed of the dispersion machine may be controlled to
14000rpm, linear velocity 66m/s；The slurry temperature may be controlled to 20~45 DEG C, and when higher (slurry heating) can be with if necessary
Pot is homogenized with alcohol wipe or is added cooling water or is reduced rotating speed.
S1.4, the slurry after completion step S1.3 is vacuumized to de-bubble, lithium ion battery cathode slurry is made in sieving discharging.
In this step, the vacuum can be >=-0.08Mpa, and the pumpdown time can be 10-30min.
S1.5, by cathode size according to unit area coat weight be 255 ± 5g/ ㎡ be coated on collector dry be made
Negative plate.
S2, prepare positive plate：The active material that particle diameter D50 is 8.0~8.5 microns is used to be incited somebody to action as active material of positive electrode
The active material of positive electrode, conductive agent and bonding agent mix with solvent, and by being dispersed with stirring obtained anode slurry；By described in
Positive pole pole slurry is that 121 ± 5g/ ㎡ are coated to the obtained positive plate of drying on collector according to unit area coat weight.
Wherein, it can be KS-6 that conductive agent, which includes tube bank conductive agent and granular conductive agent, the tube bank conductive agent,；The anode
Active material can be by active material of positive electrode relatively small the particle diameter D50 obtained after improvement, specifically, anode activity
Material can be by improving the Delanium that obtained particle diameter D50 is 8.0~8.5 microns；The solvent can be N- methyl pyrroles
Pyrrolidone；In some other embodiment, the solvent can also be water；The binding agent can select Kynoar, styrene-
One or more in butadiene copolymer, acrylic acid series copolymer, carboxymethyl cellulose and butadiene-styrene rubber.The anode activity material
Material, the mass ratio of the conductive agent and the binding agent are：Active material of positive electrode 94%-98%, conductive agent 0.5%-3.0%, glue
Meet agent 1.5%-3.0%.The collector can be aluminium sheet.
Specifically, the step 2 can also include：
2.1st, by formula rate weigh the active material of positive electrode, the conductive agent and the binding agent and with solvent simultaneously
It is put into mixer, is mixed to prepare positive pole premix slurry.
Wherein, wherein the mixer used can be twin shaft leaf formula high efficient mixer, incorporation time can be 3-5min.
S2.2, all positive poles premix slurry is added in mixer and adjusts mixing speed.
Wherein, the mixer revolution speed is≤15rpm, rotational velocity≤1000rpm, mixing time≤60min.
S2.3, will complete the slurry after step S2.2 carry out it is scattered at a high speed.
In this step, can be disperseed using high speed dispersor, the rotating speed of the dispersion machine may be controlled to
14000rpm, linear velocity 66m/s；The slurry temperature may be controlled to 20~45 DEG C, and when higher (slurry heating) can be with if necessary
Pot is homogenized with alcohol wipe or is added cooling water or is reduced rotating speed.
Slurry after completing step S2.3 is vacuumized de-bubble by S2.4, and lithium ion battery anode glue size is made in sieving discharging.
In this step, the vacuum can be >=-0.08Mpa, and the pumpdown time can be 10-30min.
S2.5, anode sizing agent is coated on collector according to positive pole unit area coat weight for 121 ± 5g/ ㎡ and dried
Positive plate is made.
It is to be appreciated that step S1 and S2 do not have sequencing restriction, it arbitrarily can successively carry out, can also enter simultaneously
OK.
S3, prepare battery：Obtained negative plate and positive plate and barrier film are assembled to form battery.
Specifically, step S3 includes：
Battery core is made in obtained negative plate and positive plate and membrane winding by S3.1.
Wherein, the negative plate is consistent with the positive plate quantity, and barrier film is placed on to the centre of the positive plate and the negative plate,
It is being wound obtained battery core.
S3.2, the battery core is put into packaging bag, and injects electrolyte, lithium ion battery is made through secondary encapsulation.
Wherein, packaging bag is insulating materials, to stablize the core strueture and prevent battery core contacts with battery from causing short circuit.
As shown in Figures 2 and 3, conventional active material of positive electrode, its D50 are 15 microns；Active material of positive electrode after improvement,
Its D50 is 8.0~8.5 microns；In the preparation method, the active material of positive electrode relatively small D50 of use, because anode is lived
The D50 of property material is smaller, and the path that lithium ion moves to active material from electrolyte is shorter, the resistance suffered by lithium ion mobility
With regard to smaller, be more advantageous to the migration of lithium ion, by selecting to improve obtained particle diameter D50 as 8.0~8.5 microns of Delanium
Lithium ion mobility speed can be improved.
As shown in Figures 4 and 5, the tubular conductive agent is smaller compared to particle conductive agent particle diameter, and specific surface area is larger, and it is in
Tubulose can be filled between active material；In S1 and S2, the conductive agent of use is to restrain conductive agent and particle conductive agent,
Mainly using complementary cooperative effect between the two, to strengthen the electric conductivity while strengthen its absorption to electrolyte.Should
Tubular conductive agent is dispersed in anode and cathode active material, plays electron bridge beam action, so as to than general granular conductive
The conductive capability of agent is big, and its electric conductivity is as shown in the table.
The tubular conductive agent of table 1 and the conductive capability of particle conductive agent
As shown in fig. 6, present invention reduces the unit area coat weight of anode and cathode, weight is coated according to negative electrode unit area
Amount is reduced to 255 ± 5g/ ㎡ by 350 ± 5g/ ㎡ and prepares negative plate；Anode unit area coat weight is reduced to by 166 ± 5g/ ㎡
121 ± 5g/ ㎡ prepare positive plate.With the reduction of the unit area coat weight of anode and cathode, in the case that compacted density is constant,
The roll-in thickness of anode and cathode slice also diminishes therewith so that micro- by original 311 ± 1 by the interlamellar spacing that negative electrode, anode and barrier film form
Rice is reduced to 209 ± 1 microns, decreases by 29%, so as to shorten lithium ion mobility path, improves the transfer ability of lithium ion.
Lithium ion battery, which is made, using the preparation method of the present invention includes negative plate, positive plate and barrier film；The barrier film position
In the centre of the negative plate and the positive plate, and the negative plate is consistent with the quantity of the positive plate, the negative plate, positive plate with
And barrier film is by being wound into the battery core of the lithium ion battery.
Fig. 7 to 9 shows the charging performance test using lithium ion battery made from the preparation method, DC internal resistance with following
The result of volume test after ring number relation test and circulation.
Charging performance is tested：2.0V is discharged to 1.0C multiplying power constant currents first, shelved 30 minutes.Secondly with 5.0C times
Rate constant current charge fills 3.65V, shelves 30 minutes.Then terminate to test；Record simultaneously under the conditions of 5C multiplying powers charging capacity and
Data.Its 5C constant-current charges ability is promoted to 96% rated capacity from 75% original rated capacity.
As shown in fig. 7, its 5C constant-current charges ability is promoted to 96% rated capacity from 75% original rated capacity.
DC internal resistance and cycle-index relation test：DC internal resistance can illustrate battery core under the charging of big multiplying power from side,
Battery core internal polarization degree；It can be seen from Ohm's law R=U/I, DC impedance is smaller, illustrates that degree of polarization is smaller, multiplying power is filled
Electrical property is more excellent.
As shown in figure 8, DC internal resistance is reduced to 1.2m Ω by original 2.0m Ω, 0.8m Ω and cycle performance are improved
Increase.
Volume test after circulation：S1, by the battery in 1C multiplying powers constant-current constant-voltage charging to 3.65V (cut-off current 0.05C),
Shelve 10min；S2, by the battery in 1C multiplying power dischargings to 2.0V, shelve 10min；S3, by the battery in 1C multiplying power constant-current charges
To 45%SOC (charging 27min), 2min is shelved；S4, by the battery 4C multiplying powers constant-current charge to 55%SOC (charging
1.5min), 2min is shelved；S5, by the battery in 4C multiplying power dischargings to 45%SOC (electric discharge 1.5min), shelve 2min；S6, again
Multiple step 4-5, is circulated 1000 times；S7, by the battery in 1C multiplying powers constant-current discharge to 2.0V, shelve 10min；S8, by the battery
In 1C multiplying powers constant-current constant-voltage charging to 3.65V (cut-off current 0.05C), 10min is shelved；S9, by the battery in 1C multiplying power constant currents
It is discharged to 2.0V and records discharge capacity, shelves 10min；10 repeat step 3-9, stop test after circulating 10000 times altogether.
As shown in figure 9, after 10000 circulations, the 1C capability retentions of sample are in 88% or so, relatively improvement after improvement
Preceding sample is superior.
It is to be appreciated that pass through above-mentioned test, it is known that, using lithium ion battery made from this method, its 5C constant-current charge
Ability is promoted to 96% rated capacity from 75% original rated capacity；DC internal resistance is reduced to 1.2m by original 2.0m Ω
Ω, improves 0.8m Ω and cycle performance also increases.
It should be understood that above example only expresses the preferred embodiment of the present invention, it describes more specific and detailed
Carefully, but the limitation to the scope of the claims of the present invention therefore can not be interpreted as；It should be pointed out that the common skill for this area
For art personnel, without departing from the inventive concept of the premise, independent assortment can be carried out to above-mentioned technical characterstic, can also done
Go out several modifications and improvements, these belong to protection scope of the present invention；Therefore, it is all to be done with scope of the invention as claimed
Equivalents and modification, the covering scope of the claims in the present invention all should be belonged to.
Claims (10)
1. a kind of preparation method with high rate capability lithium ion battery, it is characterised in that comprise the following steps：
S1, prepare negative plate：The active material that particle diameter D50 is 1.0~1.5 microns is used as active material of cathode, will described in
Active material of cathode, conductive agent and bonding agent mix with solvent, and by being dispersed with stirring obtained cathode size；By the negative pole
Slurry is that 255 ± 5g/ ㎡ are coated to the obtained negative plate of drying on collector according to unit area coat weight；The conductive agent bag
Include tube bank conductive agent and granular conductive agent；
S2, prepare positive plate：The active material that particle diameter D50 is 8.0~8.5 microns is used as active material of positive electrode, will described in
Active material of positive electrode, conductive agent and bonding agent mix with solvent, and by being dispersed with stirring obtained anode sizing agent；By the positive pole
Slurry is that 121 ± 5g/ ㎡ are coated to the obtained positive plate of drying on collector according to unit area coat weight；The conductive agent bag
Include tube bank conductive agent and granular conductive agent；
S3, prepare battery：The negative plate, the positive plate and barrier film are assembled and to form battery.
2. the preparation method according to claim 1 with high rate capability lithium ion battery, it is characterised in that walked in S1
In rapid, the mass ratio of the active material of cathode, the conductive agent and the binding agent is：Active material of cathode 94%-
98%th, conductive agent 0.5%-3.0%, bonding agent 1.5%-3.0%.
3. the preparation method according to claim 2 with high rate capability lithium ion battery, it is characterised in that walked in S1
In rapid, the active material of cathode is the LiFePO4 that particle diameter D50 is 1.0~1.5 microns；The tube bank conductive agent is KS-6,
The solvent is 1-METHYLPYRROLIDONE.
4. the preparation method according to claim 1 with high rate capability lithium ion battery, it is characterised in that walked in S2
In rapid, the mass ratio of the active material of positive electrode, the conductive agent and the binding agent is：Active material of cathode 94%-
98%th, conductive agent 0.5%-3.0%, bonding agent 1.5%-3.0%.
5. the preparation method according to claim 4 with high rate capability lithium ion battery, it is characterised in that
In S1 steps, the active material of cathode is by improving the artificial stone that obtained particle diameter D50 is 8.0~8.5 microns
Ink；The tube bank conductive agent is KS-6；The solvent is 1-METHYLPYRROLIDONE.
6. the preparation method according to claim 1 with high rate capability lithium ion battery, it is characterised in that walked in S3
In rapid, the interlamellar spacing being made up of in the battery negative electrode, anode and barrier film is 209 ± 1 microns.
7. the preparation method as claimed in any of claims 1 to 6 with high rate capability lithium ion battery, it is special
Sign is that the S1 steps comprise the following steps：
S1.1, weigh by formula rate the active material of cathode, the conductive agent and the binding agent and with solvent while putting
Enter in mixer, be mixed to prepare negative pole premix slurry；
S1.2, all negative poles premix slurry is added in mixer and adjusts mixing speed；
S1.3, will complete the slurry after the step S1.2 carry out it is scattered at a high speed；
S1.4, the slurry after the step S1.3 will be completed vacuumize de-bubble, lithium ion battery cathode slurry is made in sieving discharging；
S1.5, by the cathode size according to unit area coat weight be 255 ± 5g/ ㎡ be coated on collector dry be made
Negative plate.
8. the preparation method as claimed in any of claims 1 to 6 with high rate capability lithium ion battery, it is special
Sign is that the S2 steps comprise the following steps：
S2.1, weigh by formula rate the active material of positive electrode, the conductive agent and the binding agent and with solvent while putting
Enter in mixer, be mixed to prepare positive pole premix slurry；
S2.2, all positive poles premix slurry is added in mixer and adjusts mixing speed；
S2.3, will complete the slurry after the step S2.2 carry out it is scattered at a high speed；
Slurry after completing the step S2.3 is vacuumized de-bubble by S2.4, and lithium ion battery anode glue size is made in sieving discharging；
S2.5, the anode sizing agent is coated on collector according to positive pole unit area coat weight for 121 ± 5g/ ㎡ and dried
Positive plate is made.
9. the preparation method according to claim 1 with high rate capability lithium ion battery, it is characterised in that walked in S3
In rapid, comprise the following steps：
Battery core is made in the negative plate, the positive plate, the membrane winding by S3.1；
S3.2, the battery core is put into packaging bag, and injects electrolyte, lithium ion battery is made through secondary encapsulation.
10. one kind has high rate capability lithium ion battery, it is characterised in that using the tool described in any one of claim 1 to 9
The preparation method for having high rate capability lithium ion battery is made；It is described have high rate capability lithium ion battery include negative plate,
Positive plate and barrier film；The negative plate, the positive plate, the membrane winding into the lithium ion battery battery core.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710464806.XA CN107394116A (en) | 2017-06-19 | 2017-06-19 | One kind has high rate capability lithium ion battery and preparation method thereof |
| PCT/CN2018/079486 WO2018233327A1 (en) | 2017-06-19 | 2018-03-19 | Lithium-ion battery with high rate performance and preparation method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (5)
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| CN108511788A (en) * | 2018-03-29 | 2018-09-07 | 东莞市智盈新能源有限公司 | A kind of high magnification ternary system start and stop lithium ion battery and preparation method thereof |
| WO2018233327A1 (en) * | 2017-06-19 | 2018-12-27 | 深圳拓邦股份有限公司 | Lithium-ion battery with high rate performance and preparation method therefor |
| CN109786654A (en) * | 2018-12-26 | 2019-05-21 | 惠州亿纬锂能股份有限公司 | Porous electrode lithium ion battery and preparation method thereof |
| WO2020119431A1 (en) * | 2018-12-14 | 2020-06-18 | 宁德时代新能源科技股份有限公司 | Lithium ion battery |
| CN112234199A (en) * | 2020-09-15 | 2021-01-15 | 深圳市拓邦锂电池有限公司 | Lithium ion battery positive electrode slurry, preparation method thereof and lithium ion battery positive electrode plate |
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Also Published As
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| WO2018233327A1 (en) | 2018-12-27 |
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