CN106450261B - A kind of the homogenate coating method and its preparation method of lithium ion battery of cathode lithium titanate - Google Patents
A kind of the homogenate coating method and its preparation method of lithium ion battery of cathode lithium titanate Download PDFInfo
- Publication number
- CN106450261B CN106450261B CN201610944951.3A CN201610944951A CN106450261B CN 106450261 B CN106450261 B CN 106450261B CN 201610944951 A CN201610944951 A CN 201610944951A CN 106450261 B CN106450261 B CN 106450261B
- Authority
- CN
- China
- Prior art keywords
- homogenate
- lithium titanate
- coating
- negative electrode
- cathode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
-
- 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
-
- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present invention provides a kind of homogenate coating methods of cathode lithium titanate, and this method comprises the following steps: a, the homogenate coating apparatus that storing material case, homogenate tank, application chamber are passed through linking into an integrated entity of conveyance conduit；B, storing material case and the humidity being homogenized in tank are controlled in 0%~10%RH range；C, homogenate solvent, negative electrode material are put into storing material case, control the humidity in storing material case in 0%~10%RH range；D, homogenate solvent and negative electrode material are imported into homogenate tank and is stirred；E, solid content, viscosity and the fineness of slurry are examined, discharging coating is prepared；F, control application chamber ambient humidity starts to be coated with to 0%~30%RH, toasted to obtain negative electrode tab pole volume.The homogenate coating method of cathode lithium titanate provided by the invention has prevented to be homogenized the moisture that lithium titanate slurry absorbs in environment in coating process and has formed gel state, reduces the flatulence problem of lithium titanate battery to a certain extent, improves the electrical property of battery.
Description
Technical field
The invention belongs to technical field of lithium ion, and in particular to the cathode lithium titanate material extremely sensitive to ambient humidity
The homogenate of material, coating method and its lithium ion battery preparation method.
Background technique
Lithium ion battery has that operating voltage is high, without memory, self discharge is small, long service life, energy density height etc. are excellent
Point is increasingly becoming the preferred energy of various electronic products；And with the development of electric car and energy storage technology, lithium ion battery
With more wide application field, while the security reliability to lithium ion battery, cycle life, use temperature range and can
The requirement of the performances such as fast charging and discharging is also higher and higher.
Lithium titanate lithium ion battery has higher security reliability relative to the lithium ion battery of conventional graphite cathode, surpasses
Long cycle life, wider use temperature range and the excellent properties that can be quickly charged and discharged, and more and more favored.
Negative electrode material in lithium titanate lithium ion battery is lithium titanate material, lithium titanate (Li4Ti5O12) there is stable spinelle knot
Structure, the characteristic with zero strain, the structure that can be avoided battery electrode material during charge and discharge cycles is destroyed, thus greatly
The cycle life of lithium titanate battery is improved, it is the 3~5 of conventional lithium ion battery that cycle life, which can achieve ten thousand times or more,
Times.The lithium ion diffusion coefficient of lithium titanate is 2 × 10-8cm2/ s, can bear 10C trickle charge and electric discharge, i.e. 6min can be full of
Electricity, and can satisfy electric car starting, climbing, acceleration and the requirement of energy-accumulating power station peak regulation tune paddy.The embedding lithium electricity of lithium titanate
Position is 1.55V (Vs.Li+/Li), will not form Li dendrite in cathode, reduce the risk of internal short-circuit, therefore lithium titanate battery
Security reliability with higher.Lithium titanate lithium ion battery performance between low temperature (- 40 DEG C) and high temperature (60 DEG C) is very prominent
Out, it can be used in most areas.
But be the lithium ion battery of cathode there are serious flatulence problem using lithium titanate, hinder its commercialized development
Speed.One of the main reason for lithium titanate lithium ion battery flatulence, which is exactly that the moisture in battery is higher, to cause.Lithium titanate material
It is mostly nanometer materials, specific surface area is larger, and the total alkali content of lithium titanate anode material is higher, so lithium titanate material
Moisture extremely sensitive to ambient humidity, easily in absorption environment.The biggish lithium titanate material of specific surface area in homogenization process
Easily absorb environment in moisture, cause slurry absorb water after slurry viscosity increase sharply, destroy slurry mobility and uniformly
State, leads to that slurry coated face density is unstable, appearance is coarse for coating, pole piece internal resistance is larger or pole piece covers material caking property not
It is good, it rolls subsequent, be die cut film-making process and seriously drop off, influence the performance in battery later period；Lithium titanate in the case where more serious
Slurry can directly water suction forms gel in homogenization process, and can not be coated with causes all slurries directly to be scrapped, and causes raw material
Cost allowance.After lithium titanate material is homogenized, during being coated, if ambient humidity is bigger, the storage of open type
Slurry and coating process will lead to lithium titanate slurry viscosity and be gradually increased, and slurry form variation causes Painting effect bad.
Lithium titanate lithium ion battery also can gradually absorb the moisture in environment in subsequent each process manufacturing process, even if
Metatitanic acid lithium ion is prepared under the same humidity environment of the conventional lithium ion batteries such as same LiFePO4, nickle cobalt lithium manganate, LiMn2O4
Battery, the battery core moisture after cell package can also be higher by 3~6 times of conventional lithium ion battery；Even if battery core passes through water after encapsulation
Divide baking, the lithium titanate lithium ion battery of volume production is still difficult the very low of moisture content drop, and battery core batch toasts
Moisture removal energy consumption is very big.Moisture in lithium titanate battery can react during the charge and discharge use and storage of battery with electrolyte
Gas is generated, and use can accelerate to produce gas under hot conditions, cause battery producing gas to expand, influence the service performance of battery, and
And very big security risk is brought to battery.
The homogenate of traditional cathode graphite lithium ion battery, coating be typically all under higher ambient humidity open type into
Capable, the reason is that the positive electrodes such as graphite cathode and traditional LiFePO4, nickle cobalt lithium manganate, LiMn2O4, do not have ambient humidity
Have it is so sensitive, as long as ambient humidity be not it is especially high, the later period performance of battery would not be influenced.But lithium titanate material
More sensitive to ambient humidity, carrying, storage, homogenate, the coating of open type can all lead to the quick absorption environment of raw material
In moisture, to influence homogenate and the Painting effect of lithium titanate material.
Therefore, the manufacture craft of lithium titanate battery to ambient humidity require it is all very strict, how in processing procedure control ring
Influence of the border humidity to lithium titanate material, the especially homogenate of lithium titanate material and painting process, to the performance of lithium titanate battery
It is used with the later period most important.
In view of conventional lithium ion battery homogenate, the prior art defect of coating process, technology to be solved by this invention is asked
Topic be to provide a kind of closed, humidity it is controllable, integrated homogenate, coating method and its preparation method of lithium ion battery；I.e.
Homogenate, coating apparatus are connection theory designs controllable based on closed, humidity, integrated, avoid lithium titanate material with outer
The contact of the larger humidity environment in boundary, thus prevented homogenate, in coating process lithium titanate slurry due to absorbing the moisture in environment
Gel state is formed, the uniformity, stability and the effect of coating of homogenate and coating are effectively improved, from lithium titanate battery
Production initial process has carried out stringent moisture control, solves the flatulence problem in lithium titanate battery use to a certain extent,
The electrical property of battery is improved, the lithium titanate lithium ion battery of scale can be instructed to produce in batches, reduces cost of raw material damage
The risk of mistake.
Summary of the invention
To achieve the goals above, the present invention provides a kind of homogenate coating method of cathode lithium titanate and its lithium-ion electrics
Pool preparation method, the technology have prevented that homogenate, lithium titanate slurry because absorbing the moisture in environment forms gel in coating process
State, effectively improves the uniformity, stability and the effect of coating of homogenate and coating, and the production from lithium titanate battery is initial
Process has carried out serious moisture control, reduces the flatulence problem in lithium titanate battery use to a certain extent, improves electricity
The electrical property in pond；The lithium titanate lithium ion battery of scale can be instructed to produce in batches, reduce the risk of cost of raw material loss.
The technical scheme of the present invention is realized as follows:
A kind of homogenate coating method of cathode lithium titanate, this method comprises the following steps:
A, the homogenate by the storing material case of purchase, homogenate tank, application chamber by linking into an integrated entity of conveyance conduit, coating
Equipment；
B, the humidity controlled in the storing material case and homogenate tank (closes each company in 0%~10%RH range later
The valve of connection interface)；
C, homogenate solvent, negative electrode material are put into storing material case, and the humidity controlled in storing material case again exists
0%~10%RH range；The negative electrode material includes negative electrode active material lithium titanate raw material, cathode conductive agent and cathode bonding
Agent (the negative electrode active material lithium titanate raw material, cathode conductive agent and negative electrode binder are respective independent packaging)；(will such as it divide
The material pail pack for not filling homogenate solvent, negative electrode active material lithium titanate raw material, cathode conductive agent and negative electrode binder is first
Transport is transferred in storing material case, later by the closed closing of storing material case, and controls the humidity in storing material case 0%
~10%RH range)
D, by the step c homogenate solvent and negative electrode material imported into homogenate tank in, be uniformly mixing to obtain slurry；
(such as by it is above-mentioned respectively fill homogenate solvent, negative electrode active material lithium titanate raw material, cathode conductive agent and negative electrode binder object
Material packaging barrel breaks a seal in sequence, the junction interface valve of storing material case and homogenate tank on conveyance conduit is opened, by defeated
Pipeline is sent to be added to homogenate tank for solvent, negative electrode active material lithium titanate raw material, cathode conductive agent and negative electrode binder is homogenized
It is interior, be stirred)
E, solid content, viscosity and the fineness of slurry obtained in the step d at room temperature, are examined, discharging coating is prepared；
F, indoor ambient humidity control will be coated with to start to be coated with obtained in the step e to 0%~30%RH range
Slurry obtains negative electrode tab pole volume after toasted later.(such as the step e slurry prepared is transported in application chamber through conveyance conduit
Coating machine on, the control of indoor ambient humidity will be coated with and start continuously to be coated in 0%~30%RH range, born after coating
Pole piece pole volume obtains the negative electrode tab pole volume of cathode process requirement after baking oven toasts)
Further, the humidity in the homogenate coating apparatus controls the (air using air displacer or dehumidifier
Displacement apparatus or dehumidifier are connected respectively in storing material case, homogenate tank and application chamber by gas pipeline).
Further, the mixing speed in the step d is 1000-2000rpm.
Further, the lithium titanate raw material are the seal-packed moisture specification for meeting inspection of raw and process materials standard, preferably
, moisture is in 100~700ppm.
Further, in the step a humidity in 0.1%~10%RH range, the step b humidity 0.1%~
10%RH range, humidity is in 0.1%~30%RH range in the step e.
Further, the discharging coating when viscosity reaches 3500-6500mPas, and fineness reaches 10-30 μm.
Further, the homogenate solvent is N-Methyl pyrrolidone (NMP).
Further, the storing material case is gloves seal box.
The present invention also provides a kind of negative electrode tabs of homogenate coating method preparation by above-mentioned cathode lithium titanate.
The present invention also provides a kind of preparation method of lithium ion battery, this method includes the coating of negative electrode slurry, described
The coating of negative electrode slurry includes the homogenate coating method of above-mentioned cathode lithium titanate.
The present invention also provides a kind of lithium ion batteries prepared by the preparation method by above-mentioned lithium ion battery.
Further, the lithium ion battery includes anode, cathode, diaphragm, electrolyte；The cathode includes negative electrode material,
The negative electrode material includes negative electrode active material, the negative electrode active material be pure lithium titanate, the lithium titanate of doping, cladding titanium
The mixture of one or more of sour lithium material.
The anode includes positive electrode, and the positive electrode includes positive electrode active materials, and the positive electrode active materials are
The mixture of one or more of nickle cobalt lithium manganate, LiMn2O4, cobalt acid lithium, LiFePO4；
The diaphragm is polypropylene (PP) material diaphragm, polyethylene (PE) material diaphragm, polypropylene (PP)/polyethylene
(PE) any one in/polypropylene (PP) three-layer-material diaphragm, non-woven fabrics material diaphragm；
The electrolyte includes lithium salts, solvent and additive；The solvent is ethylene carbonate (EC), propene carbonate
(PC), diethyl carbonate (DEC), dimethyl carbonate (DMC), methyl ethyl carbonate (EMC), two kinds in gamma-butyrolacton solvent with
On mixture；The additive be propylene sulfite (PS), butylene sulfite (BS), succinic anhydride (SA), LiBOB,
LiDFOB, vinylene carbonate (VC), biphenyl (BP), LiFSI, LiPF4C2O4, one or both of trioctyl phosphate (TOP)
Above mixture, wherein additive accounts for the 0.1%~5% of electrolyte quality；The lithium salts is LiPF6、LiBF4、LiCLO4In
One or more kinds of mixtures.
Compared with the existing technology, beneficial effects of the present invention:
A kind of controllable it is an advantage of the present invention to provide closed, humidity, integrated homogenate coating method, i.e. homogenate apply
Cloth equipment be closed, humidity it is controllable, it is integrated, avoid lithium titanate material with the contact of extraneous larger humidity environment, from
And prevented that homogenate, lithium titanate slurry because absorbing the moisture in environment forms gel state in coating process, it effectively improves
Uniformity, stability and the effect of coating of homogenate and coating, have carried out strictly from the production initial process of lithium titanate battery
Moisture control, solve the flatulence problem in lithium titanate battery use to a certain extent, improve the electrical property of battery, can refer to
The lithium titanate lithium ion battery batch production for leading scale, reduces the risk of cost of raw material loss.
Wherein, 1. it is closed refer to Sealing Arrangement and space include closed storing material case, homogenate tank, conveyance conduit,
Application chamber；2. humidity, which controllably refers to ambient humidity integrally, can guarantee in the range of 0~30%RH, in the range according to each
Work step demand Regulate Environment humidity guarantees the effect of homogenate, coating；On the one hand Regulate Environment humidity can use displacement drying sky
Gas or dry N2Etc. dry gas, on the other hand directly can guarantee the dew-point temperature under corresponding humidity i.e. using dehumidification equipment
It can adjust required ambient humidity；3. integrated design refers to the demand equipment of each work step and device is to be locally isolated, is whole
It links together, local demand humidity can be regulated and controled according to each work step requirement by being locally isolated, and the energy is avoided to consume excessively；It is whole
The purpose of design of body integration connection is the necessary condition for the ease of controlling ambient humidity, to guarantee that raw material are thrown in Kaifeng
Pole piece moisture controls after state consistency, and coating during material, slurry homogenate, slurry coating, coating pole piece.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is homogenate, coating apparatus and apparatus integration design diagram；
Fig. 2 difference is homogenized the battery core multiplying power charging performance comparison diagram of coating method preparation；
Description of symbols:
1- storing material case, 2- material pail pack, 3- conveyance conduit, 4- are homogenized tank, 5- application chamber, 6- coater head, 7-
Baking oven, 8- are coated with tail.
Specific embodiment
Unless otherwise stated, term used herein all has the meaning that those skilled in the art routinely understand.
Below with reference to examples and drawings, the present invention will be described in detail.
Embodiment
1, a kind of homogenate coating method of cathode lithium titanate, this method comprises the following steps:
A, the storing material case 1 of purchase, homogenate tank 4 and application chamber 5 are passed through into the even of 3 linking into an integrated entity of conveyance conduit
Air displacer is connected on storing material case 1 and homogenate tank 4 by slurry, coating apparatus by gas pipeline；In application chamber 5
Equipped with dehumidifier；The storing material case 1 is gloves seal box；
B, air displacement button is opened, fills dry N by taking out2, control the humidity in storing material case 1 and homogenate tank 4
Within the scope of 10%RH, the valve of each connecting interface is closed later；
C, homogenate solvent N-methyl pyrilidone (NMP), the pure lithium titanate of negative electrode active material, negative conductive will be filled respectively
The material pail pack 2 of agent conductive black and negative electrode binder Kynoar (PVDF) is first transported and is transferred in storing material case 1,
Later by the closed closing of storing material case 1, it is again turned on air displacement button, is taken out into storing material case 1 and fills dry N2, will
Within the scope of humid control to 10%RH in storing material case 1；
D, above-mentioned each material pail pack 2 is broken a seal in sequence, opens storing material case 1 and homogenate tank on conveyance conduit
4 junction interface valve, the ratio for being 100:138 according to homogenate solvent and the mass ratio of negative electrode material, will first be homogenized solvent
N-Methyl pyrrolidone (NMP) is added in homogenate tank 4 by conveyance conduit 3；Then by the pure lithium titanate of negative electrode active material, negative
Pole conductive agent conductive black, negative electrode binder Kynoar (PVDF) according to each account for negative electrode material weight ratio 88%,
5%, it 7% is added step-wise in the homogenate tank 4 for filling homogenate solvent N-methyl pyrilidone (NMP), is stirred, the speed of stirring
Degree is 1500rpm；
E, after slurry agitation, a small amount of slurry is taken out from discharge port, examines slurry to contain admittedly, viscosity, fineness, solid content reaches
To 42%, viscosity reaches 6500mPas, and fineness reaches 10 μm, and slurry prepares discharging coating later；
F, dehumidifier button is opened, the ambient humidity in application chamber 5 is controlled to 15%-20%RH range, by step e system
Standby slurry is transported to application chamber 5 through conveyance conduit 3, slurry is coated uniformly on to the two sides of aluminium foil by coater head 6, later
After the baking of baking oven 7, negative electrode tab pole is obtained at coating tail 8 and is rolled up.
2, a kind of preparation method of lithium ion battery, this method comprises the following steps:
(1) anode sizing agent and coating are prepared:
Directly homogenate tank 4 is opened according to conventional homogenate mode, by positive electrode active materials nickle cobalt lithium manganate, positive conductive agent
Conductive black, positive electrode binder Kynoar (PVDF) are according to each accounting for the weight ratio 92%, 4%, 4% of positive electrode gradually
It is added in the homogenate tank 4 for filling homogenate solvent N-methyl pyrilidone (NMP), is uniformly mixed into just after 1500rpm is stirred
The anode sizing agent being prepared taking-up is dumped in slurry storage tank, is transferred to application chamber 5 later and passes through coating machine by pole slurry
First 6 are coated uniformly on aluminium foil two sides, are dried to obtain positive plate pole volume, and homogenate coating environment humidity is controlled according to 35-40%RH；
(2) negative electrode slurry and coating are prepared:
The homogenate coating method of for example above-mentioned cathode lithium titanate of the step.
(3) film-making:
The positive plate pole being prepared respectively in step (1) and (2) volume and negative electrode tab pole volume are rolled according to technique requirement,
The positive plate and negative electrode tab that meet the requirement of battery core pole piece size are obtained after cross cutting；
(4) it assembles:
The positive plate prepared, negative electrode tab are stacked or are wound into battery core by anode, the alternate mode of cathode, wherein anode
It is separated with cathode with polyethylene (PE) material diaphragm, positive pole ear, negative lug are by being welded and fixed；By soldered naked electricity
Core is placed into molding aluminum plastic film and is packaged, and there are liquid injection ports for airbag side；
(5) battery core baking, fluid injection encapsulation:
Battery core after encapsulation is subjected to moisture baking, moisture measurement meets after technique requires from electrolyte inlet to battery
The LiPF of 160 ± 1.0g of injection in shell6+ EC+EMC+PS+LiBOB (its mass percent is 12:30:55:1.5:1.5) electricity
Liquid injection port is sealed after solution liquid, and is stood and infiltrated for 24 hours；
(6) it is melted into:
Battery core after infiltration is subjected to charge and discharge chemical conversion: first by battery with 1.0C electric current constant-current constant-voltage charging to 2.8V, so
Afterwards with 1.0C electric current constant-current discharge to 1.5V, charge and discharge 2 circulations are completed, carry out height after battery crossing current is charged to 2.8V again
Warm aging 7 days, degas obtains lithium titanate battery after the completion.
Comparative example:
A kind of slurry and coating method of cathode lithium titanate, include the following steps:
Directly homogenate tank 4 is opened according to conventional homogenate mode, the pure lithium titanate of negative electrode active material, cathode conductive agent are led
Electric carbon black, negative electrode binder Kynoar (PVDF) gradually add according to the weight ratio 88%, 5%, 7% for each accounting for negative electrode material
Enter into the homogenate tank 4 for filling homogenate solvent N-methyl pyrilidone (NMP), is uniformly mixed into cathode after 1500rpm is stirred
Slurry dumps to the negative electrode slurry being prepared taking-up in slurry storage tank, is transferred to application chamber later and passes through coater head 6
It is coated uniformly on the two sides of aluminium foil, is dried to obtain negative electrode tab pole volume, homogenate coating environment humidity is controlled according to 35-40%RH.
Other steps in the preparation method of the lithium battery are identical as embodiment, and details are not described herein.
1 embodiment and comparative example cathode of table is homogenized the comparison of slurry coating result
Fig. 2 is the multiplying power charging performance comparison for the battery core that the different cathode of embodiment and comparative example is homogenized coating method preparation
Figure, the using effect using battery core made from the method for the present invention is better than made from conventional method as we know from the figure.
The above description is only an embodiment of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of homogenate coating method of cathode lithium titanate, it is characterised in that: this method comprises the following steps:
A, the storing material case (1) of purchase, homogenate tank (4), application chamber (5) are passed through into conveyance conduit (3) linking into an integrated entity
It is homogenized coating apparatus；
B, the humidity in the storing material case (1) and homogenate tank (4) is controlled in 0% ~ 10%RH range；
C, homogenate solvent, negative electrode material are put into storing material case (1), and control the humidity in storing material case (1) again
In 0% ~ 10%RH range；The negative electrode material includes negative electrode active material lithium titanate raw material, cathode conductive agent and cathode bonding
Agent；
D, by the step c homogenate solvent and negative electrode material imported into homogenate tank (4) in, be uniformly mixing to obtain slurry；
E, solid content, viscosity and the fineness at room temperature, examining slurry obtained in the step d, when viscosity reaches 3500-
6500 mPas, discharging coating when fineness reaches 10-30 μm；
F, start the interior environment humid control of application chamber (5) to be coated with slurry obtained in the step e to 0% ~ 30%RH range, it
It is rolled up by negative electrode tab pole is obtained after baking.
2. a kind of homogenate coating method of cathode lithium titanate according to claim 1, it is characterised in that: the homogenate coating
Ambient humidity in equipment is controlled using air displacer or dehumidifier.
3. a kind of homogenate coating method of cathode lithium titanate according to claim 1 or 2, it is characterised in that: the step d
In mixing speed be 1000-2000rpm.
4. a kind of homogenate coating method of cathode lithium titanate according to claim 1 or 2, it is characterised in that: the metatitanic acid
Lithium raw material are the seal-packed moisture specification for meeting inspection of raw and process materials standard, and moisture is in 100 ~ 700ppm.
5. a kind of preparation method of lithium ion battery, it is characterised in that: this method includes the coating of negative electrode slurry, the cathode slurry
The coating of material includes the homogenate coating method of the described in any item cathode lithium titanates of claim 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610944951.3A CN106450261B (en) | 2016-11-02 | 2016-11-02 | A kind of the homogenate coating method and its preparation method of lithium ion battery of cathode lithium titanate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610944951.3A CN106450261B (en) | 2016-11-02 | 2016-11-02 | A kind of the homogenate coating method and its preparation method of lithium ion battery of cathode lithium titanate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106450261A CN106450261A (en) | 2017-02-22 |
| CN106450261B true CN106450261B (en) | 2019-10-11 |
Family
ID=58177605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610944951.3A Active CN106450261B (en) | 2016-11-02 | 2016-11-02 | A kind of the homogenate coating method and its preparation method of lithium ion battery of cathode lithium titanate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106450261B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107146873A (en) * | 2017-05-25 | 2017-09-08 | 西藏杭能新能源科技有限公司 | A kind of preparation method of lithium titanate anode electrode |
| CN107221700B (en) * | 2017-07-07 | 2019-08-13 | 安普瑞斯（无锡）有限公司 | A kind of arc lithium ion secondary battery and its manufacturing method |
| CN108565502B (en) * | 2018-01-15 | 2020-06-16 | 江西省汇亿新能源有限公司 | Automatic lithium battery feeding system and using method thereof |
| CN108280555B (en) * | 2018-03-02 | 2021-05-28 | 天津齐物科技有限公司 | Method for optimizing production process of lithium ion battery |
| EP4101523A4 (en) * | 2020-02-03 | 2023-03-22 | Nihon Spindle Manufacturing Co., Ltd. | Slurry storage device, slurry production system and slurry storage method |
| CN114695879B (en) * | 2022-03-14 | 2024-05-28 | 广西燚能新能源有限公司 | Electrolyte of lithium iron phosphate power battery pole piece and experimental method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513260A (en) * | 2011-12-16 | 2012-06-27 | 佛山市锦德机械设备有限公司 | Digital coating system |
| CN203508257U (en) * | 2013-09-27 | 2014-04-02 | 天津神龙兴业科技有限公司 | Vehicle-mounted paint spraying machine |
| CN203695338U (en) * | 2013-11-22 | 2014-07-09 | 广东坚美铝型材厂（集团）有限公司 | Fluorocarbon spraying system of aluminum profile |
| CN204130646U (en) * | 2014-09-19 | 2015-01-28 | 徐敖奎 | A kind of process units of lithium ion battery |
| CN105529430A (en) * | 2015-11-20 | 2016-04-27 | 河北银隆新能源有限公司 | Preparation method of nano lithium titanate anode slurry |
-
2016
- 2016-11-02 CN CN201610944951.3A patent/CN106450261B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513260A (en) * | 2011-12-16 | 2012-06-27 | 佛山市锦德机械设备有限公司 | Digital coating system |
| CN203508257U (en) * | 2013-09-27 | 2014-04-02 | 天津神龙兴业科技有限公司 | Vehicle-mounted paint spraying machine |
| CN203695338U (en) * | 2013-11-22 | 2014-07-09 | 广东坚美铝型材厂（集团）有限公司 | Fluorocarbon spraying system of aluminum profile |
| CN204130646U (en) * | 2014-09-19 | 2015-01-28 | 徐敖奎 | A kind of process units of lithium ion battery |
| CN105529430A (en) * | 2015-11-20 | 2016-04-27 | 河北银隆新能源有限公司 | Preparation method of nano lithium titanate anode slurry |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106450261A (en) | 2017-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106450261B (en) | A kind of the homogenate coating method and its preparation method of lithium ion battery of cathode lithium titanate | |
| EP3113273B1 (en) | Lithium ion secondary battery | |
| CN104300123B (en) | A kind of blended anode material, positive plate and lithium ion battery using the positive electrode | |
| CN201682023U (en) | Lithium ion battery | |
| CN102361095B (en) | Lithium ion battery with high specific power and preparation method for same | |
| CN101436679B (en) | Non-aqueous electrolyte battery | |
| CN103779600B (en) | A kind of lithium titanate battery and manufacture method | |
| CN106941192B (en) | Lithium ion secondary battery | |
| US10756386B2 (en) | Lithium ion battery and method for preparing the same | |
| CN106025334A (en) | Lithium secondary battery and manufacturing method of the same | |
| CN106058322B (en) | A kind of production method of high multiplying power electrokinetic cell | |
| CN106058261B (en) | Non-aqueous electrolyte secondary battery and its manufacturing method | |
| CN104282935A (en) | Lithium titanate battery and manufacturing method thereof | |
| CN105098240A (en) | Method for producing energy storage device and energy storage device | |
| CN106711428A (en) | Lithium-rich ternary composite material and preparation method thereof | |
| CN110335991A (en) | A kind of long circulation life battery and preparation method thereof | |
| EP3451422B1 (en) | Positive electrode for lithium ion secondary battery, and lithium ion secondary battery | |
| CN112768642A (en) | Negative electrode material and preparation method thereof, negative electrode plate, lithium ion battery cell and lithium ion battery pack and application thereof | |
| CN108649262A (en) | A kind of solid state battery organic silicon substrate buffer layer and preparation method thereof and application | |
| JP2003243038A (en) | Positive electrode plate and lithium secondary battery using it | |
| CN106784809A (en) | A kind of LiVOPO4/LiMPO4/ C composite material of core-shell structure and preparation method | |
| WO2024000095A1 (en) | Negative electrode sheet, secondary battery, battery module, battery pack, and electric apparatus | |
| CN108511805A (en) | A kind of solid state battery PMMA base buffer layers and preparation method thereof and application | |
| CN219591429U (en) | Cathode pole piece, electrode assembly, battery cell, battery and electricity utilization device | |
| CN112838196B (en) | Secondary battery and device containing the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |