CN110474016A - A kind of flexible method of improvement positive plate, positive plate and lithium ion battery - Google Patents
A kind of flexible method of improvement positive plate, positive plate and lithium ion battery Download PDFInfo
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- CN110474016A CN110474016A CN201910708076.2A CN201910708076A CN110474016A CN 110474016 A CN110474016 A CN 110474016A CN 201910708076 A CN201910708076 A CN 201910708076A CN 110474016 A CN110474016 A CN 110474016A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a kind of flexible method of improvement positive plate and thus obtained positive plate, includes the following steps: anode sizing agent being coated in plus plate current-collecting body surface, obtain initial positive plate, wherein coating thickness D1；The initial positive plate is subjected to first time cold pressing；Positive plate after first time is cold-pressed carries out second and is cold-pressed；Wherein, the target thickness of positive plate is H, and the positive plate after being cold-pressed for the first time meets with a thickness of D2, D2: D2=D1-(D1-H) × k, wherein k is 40%-80%.The present invention can promote the flexibility of positive plate using the method for secondary cold pressing by adjusting compaction technology, and introduce without additional equipment, and simple process is efficiently, at low cost.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly to a kind of flexible method of improvement positive plate
And thus obtained positive plate, lithium ion battery.
Background technique
Lithium ion battery has high discharge voltage, energy density height, power density height, has extended cycle life, memory-less effect
Equal many merits, consumer electronics, electric tool, medical electronics etc. it is small-sized can charge and discharge field of batteries be applied widely;In
The field of traffic such as electric bicycle, pure electric automobile, hybrid vehicle, rail traffic, aerospace, ship naval vessels are just gradually
It puts it over;In the access of extensive renewable energy, peak load regulation network frequency modulation, distributed-power, microgrid off-network, family power, number
According to the energy fields such as center backup power source, communication base station, energy regenerating, green building and wearable electronic, transparent electron,
The emerging technology areas such as robot also show preferable application prospect.During market development, to battery energy density
Demand is also higher and higher.
Lithium ion battery is grouped as by groups such as anode, cathode, diaphragm, electrolyte, by homogenate, be coated with, roll, point
It cuts, wind, fluid injection, assembly, the process flows such as chemical conversion, completing battery core production.The promotion of battery core energy density can pass through each component
Material gram volume, thickness angularly solve.Positive aspect, energy density can be by introducing high gram volume positive electrode, being promoted just
Pole-face density promotes anode compacting to reach energy density demand.But it is existing to roll with the promotion of surface density, compacted density
Under technique, positive plate flexibility decline, pole piece becomes fragile, and pole piece fold is serious when causing to wind, and influences circularity after electric core winding, and
It may cause positive plate part；The serious position active material of fold is peeled off from collection liquid surface simultaneously, influences the performance of later period capacity
With battery core cycle performance.
Pole piece flexibility is promoted, is improved from material angle, proving period is long, poor universality, as can solving then from technique
It is simple and efficient, it is versatile, it is easy to implement.
Summary of the invention
In order to make up the defect of prior art, the present invention provides a kind of improvement positive plate flexible method and thus
Positive plate, the lithium ion battery arrived solves current high-energy density system positive plate brittleness problems.
The technical problems to be solved by the invention are achieved by the following technical programs:
A kind of flexible method of improvement positive plate, includes the following steps:
Anode sizing agent is coated in plus plate current-collecting body surface, obtains initial positive plate, wherein coating thickness D1；
The initial positive plate is subjected to first time cold pressing；
Positive plate after first time is cold-pressed carries out second and is cold-pressed；
Wherein, the target thickness of positive plate is H, and the positive plate after being cold-pressed for the first time meets with a thickness of D2, D2: D2=D1-
(D1-H) × k, wherein k is 40%-80%.
Further, the initial positive plate includes the face A and the face B being oppositely arranged, and when being cold-pressed for the first time, A is face-up；The
When secondary cold pressing, B is face-up.
Further, the thickness of positive plate is identical as the target thickness of the positive plate after second of cold pressing.
Further, make to prepare positive plate standing after the first time is cold-pressed before being cold-pressed for described second.
Further, the time of repose is 1 hour or more.
The present invention also provides a kind of positive plates, are prepared by the above method.
The present invention also provides a kind of lithium ion batteries comprising above-mentioned positive plate.
The invention has the following beneficial effects:
The present invention can promote the flexibility of positive plate using the method for secondary cold pressing by adjusting compaction technology, and be not necessarily to volume
Outer equipment introduces, and simple process is efficiently, at low cost.
Using this method, anode pole piece design compacting can be promoted, under the premise of guaranteeing performance, promotes battery core energy density.
Detailed description of the invention
Fig. 1 is the comparison diagram of the positive plate after being wound after cold pressing treatment in embodiment 1 and comparative example 1；
Fig. 2 is the maximum compacting comparison diagram of positive plate after cold pressing treatment in embodiment 1 and comparative example 1；
Fig. 3 is the schematic diagram of secondary cold pressing treatment.
In figure: 1, upper milling roller, 2, lower milling roller, 3, the face A, 4, tape transport direction.
Specific embodiment
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term as used herein "and/or" includes one or more
Any and all combinations of relevant listed item.
Herein "include", "comprise", " containing ", " containing ", " having " or other variants be intended to it is non-enclosed include,
It is not distinguished between these terms.Term "comprising", which refers to, can be added not the other steps for influencing final result and ingredient.Term
"comprising" further includes term " Consists of " and "consisting essentially of ...".The compositions and methods of the invention/technique may include,
It is made from it and substantially by essential elements described herein and limit entry and described herein any additional or optional
Ingredient, component, step or limit entry composition.
In order to promote the flexibility of positive plate, the emphasis studied at present is the material for improving positive plate, but proving period
Long, poor universality, it is inconvenient to implement.
In view of the above-mentioned problems, inventor has found by further investigation, by adjusting compaction technology, using the side of secondary cold pressing
Method can promote the flexibility of positive plate.
The compaction technology of positive electrode current piece is generally using primary cold pressing or multiple heat pressing process.High-energy density system,
Positive plate is using after cold-press process, and pole piece is partially crisp, and flexibility is poor, and when winding is also easy to produce fold, causes active material sum aggregate
Fluid separation, influences battery core capacity and performance；Multiple heat pressing process, though pole piece flexibility can be promoted to a certain extent,
Equipment investment is big, and energy consumption increases, and increased costs are big.The present invention is designed by secondary cold-press process, and it is flexible to can reach promotion pole piece
Property purpose, and introduced without extras, simple process is efficiently, at low cost.
Based on above-mentioned thinking, the present invention provides a kind of improvement positive plate flexible method, includes the following steps:
Anode sizing agent is coated in plus plate current-collecting body surface, obtains initial positive plate, wherein coating thickness D1；
The initial positive plate is subjected to first time cold pressing；
Positive plate after first time is cold-pressed carries out second and is cold-pressed；
Wherein, the target thickness of positive plate is H, and the positive plate after being cold-pressed for the first time meets with a thickness of D2, D2: D2=D1-
(D1-H) × k, wherein k is 40%-80%, may be, for example, the section model of 40%, 50%, 60%, 70%, 80% or the formation of these numerical value
It encloses.
Inventors have found that develop it is suitable be cold-pressed for the first time after positive plate thickness, key point 40-80% this
Ratio is more than the proportional region, and it is less obvious that flexibility promotes effect；When lower than 40%, required pressure and primary is rolled for the second time
It rolls quite, pole piece thickness direction distribution of particles is influenced smaller；When higher than 80%, required pressure and primary stone roller are rolled for the first time
Quite, thickness direction pole piece particle uniformity can not be influenced for the second time to pressure by rolling, and it is poor that flexibility promotes effect.
In the present invention, the initial positive plate includes the face A and the face B being oppositely arranged, and when being cold-pressed for the first time, A is face-up；The
When secondary cold pressing, B is face-up.
In the present invention, the thickness of positive plate is identical as the target thickness of the positive plate after second of cold pressing.
In the present invention, cold pressing for the first time and second of cold pressing can be carried out using existing rolling device, it will be understood that work
When making, positive plate is placed between upper milling roller and lower milling roller, cold pressing pressure is loaded, positive plate is compacted to scheduled thickness
Degree.
In the present invention, to specific process parameter (temperature, the pressure of cold pressing such as cold pressing of first time cold pressing and second of cold pressing
Power and the time of cold pressing etc.) it is not especially limited, those skilled in the art can be adjusted according to the scheduled thickness of positive plate.
In the present invention, the anode sizing agent is not especially limited, it can be using existing various anodes in the prior art
Slurry.It is appreciated that the anode sizing agent includes positive active material, conductive agent, binder and solvent；The positive electrode active material
Matter can be selected from lithium and cobalt oxides, lithium nickel oxide, lithium manganese oxide, Li, Ni, Mn oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminium
Oxide, li-contained phosphate of olivine structural etc., but the application is not limited to these materials, can also use other can quilt
Conventional known material as active substance of lithium ion battery anode.The conductive agent include conductive black, carbon nanotube or
In KS-6 any one or at least two combination.
In the present invention, the type of plus plate current-collecting body is not particularly limited, can be used existing various in the prior art
Plus plate current-collecting body.As an example, the plus plate current-collecting body can be one of aluminium foil, carbon-coated aluminum foils and porous aluminium foil.
In the present invention, make to prepare positive plate standing after the first time is cold-pressed before being cold-pressed for described second.
After being cold-pressed for the first time, the stress of positive plate is larger, and in order to discharge the stress of positive plate, the present invention is cold-pressed in first time
Positive plate is subjected to long-time standing afterwards, the stress of positive plate is discharged by the time.
The time of repose is 1 hour or more, such as can be 2 hours, 3 hours etc..
The present invention also provides a kind of positive plates, are prepared by the above method.
The present invention also provides a kind of lithium ion batteries comprising above-mentioned positive plate.
The present invention will now be described in detail with reference to examples, and the examples are only preferred embodiments of the present invention,
It is not limitation of the invention.
Embodiment 1
A kind of flexible method of improvement positive plate, includes the following steps:
Anode sizing agent is coated in plus plate current-collecting body surface, obtains initial positive plate, wherein coating thickness D1；It is described initial
Positive plate includes the face A and the face B being oppositely arranged；
The A of the initial positive plate is face-up, the initial positive plate is carried out by first time cold pressing by rolling device；
1 hour or more is stood after being cold-pressed for the first time, the positive plate B after being then again cold-pressed first time is face-up, by rolling dress
Second of progress is set to be cold-pressed；
Wherein, the target thickness of positive plate is H, and the positive plate after being cold-pressed for the first time meets with a thickness of D2, D2: D2=D1-
(D1-H) × 50%；The thickness of positive plate is identical as the target thickness of the positive plate after second of cold pressing.
Embodiment 2
A kind of flexible method of improvement positive plate, includes the following steps:
Anode sizing agent is coated in plus plate current-collecting body surface, obtains initial positive plate, wherein coating thickness D1；It is described initial
Positive plate includes the face A and the face B being oppositely arranged；
The A of the initial positive plate is face-up, the initial positive plate is carried out by first time cold pressing by rolling device；
1 hour or more is stood after being cold-pressed for the first time, the positive plate B after being then again cold-pressed first time is face-up, by rolling dress
Second of progress is set to be cold-pressed；
Wherein, the target thickness of positive plate is H, and the positive plate after being cold-pressed for the first time meets with a thickness of D2, D2: D2=D1-
(D1-H) × 40%；The thickness of positive plate is identical as the target thickness of the positive plate after second of cold pressing.
Embodiment 3
A kind of flexible method of improvement positive plate, includes the following steps:
Anode sizing agent is coated in plus plate current-collecting body surface, obtains initial positive plate, wherein coating thickness D1；It is described initial
Positive plate includes the face A and the face B being oppositely arranged；
The A of the initial positive plate is face-up, the initial positive plate is carried out by first time cold pressing by rolling device；
1 hour or more is stood after being cold-pressed for the first time, the positive plate B after being then again cold-pressed first time is face-up, by rolling dress
Second of progress is set to be cold-pressed；
Wherein, the target thickness of positive plate is H, and the positive plate after being cold-pressed for the first time meets with a thickness of D2, D2: D2=D1-
(D1-H) × 80%；The thickness of positive plate is identical as the target thickness of the positive plate after second of cold pressing.
Comparative example 1
Based on embodiment 1, the difference is that: it is once cold-pressed in this comparative example 1, the thickness of positive plate after being cold-pressed for the first time
It is identical as the target thickness of the positive plate.
Comparative example 2
Based on embodiment 1, the difference is that: in this comparative example 1, D2=D1-(D1-H) × 30%.
Comparative example 3
Based on embodiment 1, the difference is that: in this comparative example 1, D2=D1-(D1-H) × 85%.
Test example 1
The test of positive plate flexibility: (1) rear positive plate will be rolled and be cut into 4cm*25cm fixed dimension；(2) positive plate is put in
Have on the platform of certain altitude, and push down pole piece with plate and fix position, naturally droops positive plate, when measuring sagging 4cm
Lateral length assesses positive plate flexibility；Wherein the more short then flexibility of lateral length is better.The length of pole piece is pushed down in this test
For 10cm, plate material is stainless steel plate, it is desirable that plate flatness is preferable.
By test, the lateral length in comparative example 1 is 5cm, and the lateral length in comparative example 2 is 4.8cm；Comparative example 3
In lateral length be 4.85cm；Lateral length in embodiment 1-3 is respectively 4.15cm, 4.54cm, 4.2cm.As it can be seen that logical
Adjustment compaction technology is crossed, using the method for secondary cold pressing, the flexibility of positive plate can be promoted.After rationally control is cold-pressed for the first time
The thickness of positive plate plays an important role to the flexibility for improving positive plate, and only D2 meets: D2=D1-(D1-H) × k, and wherein k is
40%-80% just can effectively improve the flexibility of positive plate.
Test example 2
The method that is respectively adopted in embodiment 1 and comparative example 1 is wound battery core after completing film-making, the state after winding referring to
Fig. 1.As it can be seen that can solve positive plate buckling problems by secondary cold-press process, active material is reduced from collector and peels off wind
Danger.
Test example 3
The positive plate that the method being respectively adopted in embodiment 1 and comparative example 1 obtains measures maximum compacting.
Maximum compaction test method: (1) coating drying after positive plate is cut into 10cm*10cm size；(2) it weighs and cuts
Good pole piece quality, is denoted as m1；(3) by adjusting rolling pressure, positive plate is pressed onto certain thickness, record rolls rear pole piece thickness
For h1；(3) rear positive plate will be rolled and carry out a doubling, be unfolded after doubling, and have observed at light folding line position whether light transmission；
Such as non-light transmission is broken, then adjusts pressure again, pole piece thickness h 0 after pressure when finding pole piece and just having started light transmission；Meter
Calculate maximum compacting, maximum compacting=(pole piece quality m1/ pole-piece area-collector surface density)/(just start light transmission pole piece thickness h 0-
Afflux body thickness).
Measurement result is referring to fig. 2.As it can be seen that can promote positive plate design compacting using secondary cold-press process, promote energy
Density.
Embodiments of the present invention above described embodiment only expresses, the description thereof is more specific and detailed, but can not
Therefore limitations on the scope of the patent of the present invention are interpreted as, as long as skill obtained in the form of equivalent substitutions or equivalent transformations
Art scheme should all be fallen within the scope and spirit of the invention.
Claims (7)
1. a kind of flexible method of improvement positive plate, which comprises the steps of:
Anode sizing agent is coated in plus plate current-collecting body surface, obtains initial positive plate, wherein coating thickness D1；
The initial positive plate is subjected to first time cold pressing；
Positive plate after first time is cold-pressed carries out second and is cold-pressed；
Wherein, the target thickness of positive plate is H, and the positive plate after being cold-pressed for the first time meets with a thickness of D2, D2: D2=D1-
(D1-H) × k, wherein k is 40%-80%.
2. improving the flexible method of positive plate as described in claim 1, which is characterized in that the initial positive plate includes phase
To the face A and the face B of setting, when being cold-pressed for the first time, A is face-up；When second of cold pressing, B is face-up.
3. improving the flexible method of positive plate as described in claim 1, which is characterized in that positive plate after second of cold pressing
Thickness is identical as the target thickness of the positive plate.
4. improving the flexible method of positive plate as described in claim 1, which is characterized in that before described second is cold-pressed
Make to prepare positive plate standing after the first time is cold-pressed.
5. improving the flexible method of positive plate as claimed in claim 4, which is characterized in that the time of repose is 1 hour
More than.
6. a kind of positive plate is prepared by the described in any item methods of claim 1-5.
7. a kind of lithium ion battery, which is characterized in that it includes positive plate as claimed in claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910708076.2A CN110474016B (en) | 2019-08-01 | 2019-08-01 | Method for improving flexibility of positive plate, positive plate and lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910708076.2A CN110474016B (en) | 2019-08-01 | 2019-08-01 | Method for improving flexibility of positive plate, positive plate and lithium ion battery |
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| CN110474016A true CN110474016A (en) | 2019-11-19 |
| CN110474016B CN110474016B (en) | 2021-01-12 |
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ID=68509678
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| CN113421992A (en) * | 2021-06-25 | 2021-09-21 | 湖北亿纬动力有限公司 | Negative plate, preparation method thereof and lithium ion battery |
| CN115642217A (en) * | 2021-02-24 | 2023-01-24 | 厦门海辰储能科技股份有限公司 | Manufacturing method of pole piece |
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| Publication number | Publication date |
|---|---|
| CN110474016B (en) | 2021-01-12 |
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