CN106784848B - Insulating coating composition, the preparation method of insulating coating, positive plate and lithium ion battery - Google Patents
Insulating coating composition, the preparation method of insulating coating, positive plate and lithium ion battery Download PDFInfo
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- CN106784848B CN106784848B CN201710036571.4A CN201710036571A CN106784848B CN 106784848 B CN106784848 B CN 106784848B CN 201710036571 A CN201710036571 A CN 201710036571A CN 106784848 B CN106784848 B CN 106784848B
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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
-
- 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
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
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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 & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present invention relates to Material Fields, specifically, disclose a kind of insulating coating composition, the preparation method of insulating coating, positive plate and lithium ion battery, wherein the composition includes insulating materials, binder and solvent.The present invention is by being mixed to prepare insulating coating for insulating materials, binder and solvent, then insulating coating obtained above and anode sizing agent and/or negative electrode slurry are coated on battery pole piece simultaneously, then the battery pole piece blank for being coated with this insulating coating is punched again, it the burr of battery pole piece that is obtained after being punched in this way and drops off situation and can be controlled effectively, solve the problems, such as that lithium ion battery obtained is easy to appear short circuit.
Description
Technical field
The present invention relates to Material Fields, and in particular, to insulating coating composition, the preparation method of insulating coating, anode
Piece and lithium ion battery.
Background technique
Pure electric vehicle using lithium-ion-power cell is the main force of current new-energy automobile, and restricts pure electric vehicle at present
The big bottleneck of the two of development of automobile is the safety problem and energy density problem of lithium ion battery.In order to further increase lithium ion
The energy density of power battery and the performance for improving lithium-ion-power cell, many power battery producers use coiled lithium ion
Battery production technology.But the preparation process of coiled lithium ion battery is related to pole piece clicking technique, and the mould for being used to be punched
With the increase of frequency of usage, generation burrs on edges and the risk dropped off also increase with it tool.If battery pole piece is being punched
Occurs burr in the process, it will cause batteries to occur positive/negative plate expansion in charge and discharge process and cause to squeeze, and then occurs
Burr drops off puncture diaphragm and causes generation short circuit.
It generates burr therefore it provides one kind can effectively prevent lithium ion battery obtained and drops off, greatly improve obtained
The insulating coating composition of the service performance of lithium ion battery, the preparation method of insulating coating, positive plate and lithium ion battery are
The problem of urgent need to resolve of the present invention.
Summary of the invention
For the above-mentioned prior art, it is an object of the invention to overcome in the prior art battery pole piece go out in blanking process
Existing burr, it will cause batteries to occur positive/negative plate expansion in charge and discharge process and cause to squeeze, and then burr occurs or fall
Material pierces through diaphragm and causes the problem that short circuit occurs, and generates burr to provide one kind and can effectively prevent lithium ion battery obtained
And drop off, greatly improve the insulating coating composition of the service performance of lithium ion battery obtained, the preparation method of insulating coating,
Positive plate and lithium ion battery.
To achieve the goals above, the present invention provides a kind of insulating coating compositions, wherein the composition includes exhausted
Edge material, binder and solvent.
The present invention also provides a kind of preparation methods of insulating coating, wherein the insulating coating is by group described above
Object is closed to be made.
The present invention also provides a kind of positive plates, wherein the positive plate includes according to preparation method system described above
The insulating coating obtained.
The present invention also provides a kind of lithium ion batteries, wherein the lithium ion battery include according to it is described above just
Pole piece.
Through the above technical solutions, the present invention is by being mixed to prepare insulating coating for insulating materials, binder and solvent, and
Insulating coating obtained above and anode sizing agent and/or negative electrode slurry are coated on battery pole piece simultaneously afterwards, then again to painting
The battery pole piece blank for being covered with this insulating coating is punched, the burr of battery pole piece that is obtained after being punched in this way and
Dropping off situation can be controlled effectively, and solve the problems, such as that lithium ion battery obtained is easy to appear short circuit.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the aluminium foil coated with insulating coating and anode sizing agent；
Fig. 2 is positive plate obtained after punching.
Description of symbols
1- aluminium foil 2- insulating coating
3- insulating coating and anode sizing agent coincidence part 4- anode sizing agent.
Specific embodiment
Detailed description of the preferred embodiments below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The present invention provides a kind of insulating coating compositions, wherein the composition includes insulating materials, binder and molten
Agent.
Above-mentioned design, then will be obtained above by the way that insulating materials, binder and solvent are mixed to prepare insulating coating
Insulating coating and anode sizing agent and/or negative electrode slurry are coated on battery pole piece simultaneously, then again to coated with this insulating coating
Battery pole piece blank be punched, the burr of battery pole piece that is obtained after being punched in this way and drop off situation and can obtain
Effective control, solves the problems, such as that lithium ion battery obtained is easy to appear short circuit.
The insulating materials, the binder and the solvent can be adjusted according to actual needs, for example, in this hair
In a kind of bright preferred embodiment, in order to further increase the insulation performance of insulating coating obtained, adhesive property and
Processing performance (for example, die-cutting performance etc.), enables insulating coating obtained to be preferably punched out, after further decreasing punching
Burr the problems such as, on the basis of the total weight of the composition, the content of the insulating materials is 30 weight %-50 weight
% is measured, the content of the binder is 2 weight %-5 weight %, and the content of the solvent is 48 weight %-68 weight %.
Here insulating materials can be insulating materials commonly used in the art, for example, a kind of preferred embodiment
In, the insulating materials can choose as ceramic material.Certainly, ceramic material here can be pottery commonly used in the art
Porcelain type, for example, can be silicon carbide ceramics, silicon nitride ceramics etc., certainly, more preferably in embodiment, in order to more preferable
Ground prevents from occurring burr in pole piece blanking process and drops off phenomenon, is preferably protected to the mold cutter head of punching, and mould is improved
Has cutter head service life, the insulating materials can be further selected as aluminium oxide and/or boehmite.By using aluminium oxide
And/or boehmite, to improve the compactness of insulating coating entirety, finish, cool-hot fatigue, fracture toughness, creep resistance
Energy and wear-resisting property etc..It is further preferred that the partial size of the aluminium oxide and/or the boehmite is not more than 1 μm.
Similarly, binder here can be type commonly used in the art, for example, the binder can be selected from
Polyvinyl alcohol, polytetrafluoroethylene (PTFE), sodium carboxymethylcellulose, polyolefins binder and Viton etc., certainly, of the invention
In one kind more preferably embodiment, occurs burr when preventing pole piece to be die cut to further increase insulating coating obtained
And the effect dropped off, the binder can be further selected as Kynoar.
Certainly, in order to which adhesive property is better achieved, and insulating coating appearance when preventing pole piece to be die cut obtained is improved
Burr and the effect dropped off, the Kynoar can be further defined to its intrinsic viscosity not less than 2.2dl/g.
Here solvent also can choose as type commonly used in the art, for example, can choose for ethylene carbonate,
Propene carbonate etc., certainly, more preferably in embodiment, the solvent can be further selected as N- crassitude
Ketone.
The present invention also provides a kind of preparation methods of insulating coating, wherein the insulating coating is by group described above
Object is closed to be made.The preparation method can be conventional mixing, for example, being directly stirred mixing etc..
Certainly, in a kind of more preferably embodiment, lithium is being coated in order to further increase insulating coating obtained
Die-cutting performance after ion battery, the preparation method include:
1) binder and first part's solvent are mixed, glue is made；
2) glue obtained in step 1) and insulating materials are mixed, coating young bird material is made；
3) coating young bird material obtained in step 2) and second part solvent are mixed, insulating coating is made；
Wherein, on the basis of the total weight of the solvent, the dosage of first part's solvent is 80 weight %-90 weight
% is measured, the dosage of the second part solvent is 10 weight %-20 weight %.
Glue can be carried out directly upon configuration using certainly, in a kind of preferred embodiment party of the invention in step 1)
It can also include that glue obtained is placed in temperature in step 1) to keep the processing performance of insulating coating obtained more preferable in formula
Degree places 120-300min under conditions of being 10-30 DEG C.
It can also include that insulating coating obtained is sieved, and is sieved in step 3) in further preferred embodiment
Sieve pore be 120-150 mesh.
Mixed process can be mode commonly used in the art, for example, in a preferred embodiment, step 1)
In be mixed into and be stirred, stirring rate 1200-1500r/min, mixing time 120-180min；And/or
It is mixed into and is stirred in step 2), stirring rate 1500-2000r/min, mixing time 240-360min；
And/or
It is mixed into and is stirred in step 3), stirring rate 1500-2000r/min, mixing time 30-60min.
The present invention also provides a kind of positive plates, wherein the positive plate includes according to preparation method system described above
The insulating coating obtained.
Certainly, the preparation method of positive plate here can be specific as follows: insulating coating and anode sizing agent are coated on just
Pole sheet metal surface；And/or insulating coating and negative electrode slurry are coated on negative metal piece surface.I.e. by insulating coating and slurry
Coated on sheet metal surface, as shown in Figure 1, being the aluminium foil coated with insulating coating and anode sizing agent.
In order to further make obtained positive plate blank and negative electrode tab the blank burr and to drop off situation less after punching, such as
Shown in Fig. 2, the thickness of the insulating coating can be further selected as 3-8mm；And the insulating coating and the anode sizing agent
Intersection with a thickness of 1-2mm (i.e. the part of appended drawing reference 3 in Fig. 1 and Fig. 2) and/or the insulating coating and described negative
Pole slurry intersection with a thickness of 1-2mm (i.e. the part of appended drawing reference 3 in Fig. 1 and Fig. 2).
The present invention also provides a kind of lithium ion batteries, wherein the lithium ion battery include according to it is described above just
Pole piece.
The present invention will be described in detail by way of examples below.In following embodiment, the aluminium oxide is commercially available grain
Diameter is not more than 1 μm of commercially available product, and the boehmite is conventional commercial products, the Kynoar be the trade mark be 5130 it is commercially available
Product, the N-Methyl pyrrolidone are conventional commercial products.
Preparation example 1
1) N-Methyl pyrrolidone of the Kynoar of 2 weight %, 60 weight % is placed in close in pulp grinder and is stirred
Glue is made in 180min；
2) glue obtained is placed under conditions of temperature is 25 DEG C and places 300min curing；
3) after the aluminium oxide of 30 weight % is added into the glue after above-mentioned curing, coating young bird material is made in stirring 300min；
4) it stirs evenly, makes after the N-Methyl pyrrolidone of 8 weight % being added in coating young bird material obtained into step 3)
Obtain mixture M 1；
5) after mixture M 1 obtained in step 4) being crossed 150 meshes, insulating coating A1 is made.
Preparation example 2
It is prepared according to the preparation method of preparation example 1, unlike, the aluminium oxide is substituted with boehmite, gathers inclined fluorine
The dosage of ethylene is 3 weight %, and the dosage of boehmite is 40 weight %, and the dosage of N-Methyl pyrrolidone is 50 weights in step 1)
% is measured, the dosage of N-Methyl pyrrolidone is 7 weight % in step 4), and insulating coating A2 is made.
Preparation example 3
It is prepared according to the preparation method of preparation example 1, unlike, boehmite, polyvinylidene fluoride are additionally added in step 3)
The dosage of alkene is 5 weight %, and the dosage of boehmite is 25 weight %, and the dosage of aluminium oxide is 25 weight %, N- first in step 1)
The dosage of base pyrrolidones is 40 weight %, and the dosage of N-Methyl pyrrolidone is 5 weight % in step 4), and insulating coating is made
A3。
Preparation example 4
The aluminium oxide of the Kynoar of 2 weight %, the N-Methyl pyrrolidone of 68 weight % and 30 weight % is placed in
It closes after crossing 150 meshes after stirring 180min in pulp grinder, insulating coating A4 is made.
Application examples 1
Insulating coating A1 obtained in preparation example 1 and anode sizing agent are coated in anode collection by extrusion coating machine simultaneously
Body aluminium foil one side, insulating coating A1 go forward side by side along anode sizing agent edge-coating about 5-6mm (i.e. insulating coating with a thickness of 5-6mm)
Row drying after to be dried, continues the another side for coating plus plate current-collecting body aluminium foil.Meanwhile guaranteeing anode sizing agent and insulating coating A1
The degree of registration of side is 0.5-1mm, and positive plate blank is made.Positive plate blank obtained above is punched out, anode is made
Piece B1.
Application examples 2
It is prepared according to the preparation method of application examples 1, unlike, the insulating coating used is insulating coating A2, system
Obtain positive plate B2.
Application examples 3
It is prepared according to the preparation method of application examples 1, unlike, the insulating coating used is insulating coating A2, system
Obtain positive plate B3.
Application examples 4
It is prepared according to the preparation method of application examples 1, unlike, the insulating coating used is insulating coating A4, system
Obtain positive plate B4.
Comparative example 1
It is prepared according to the preparation method of application examples 1, unlike, insulating coating A1 is not used, positive plate D1 is made.
Test case
The burr of B1-B3 and D1 obtained above are detected respectively and drops off situation, while by B1-B3 obtained above and D1
It is assembled into lithium ion battery by this field usual manner, detects its cycle life, obtains that the results are shown in Table 1.
Table 1
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail within the scope of the technical concept of the present invention can be with various simple variants of the technical solution of the present invention are made, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (5)
1. a kind of preparation method of based lithium-ion battery positive plate, which is characterized in that this method includes by insulating coating and anode slurry
Material is coated on aluminium foil surface, the insulating coating along anode sizing agent edge-coating, the insulating coating with a thickness of 3-8mm, institute
State insulating coating and the anode sizing agent intersection with a thickness of 1-2mm,
The composition for being used to prepare the insulating coating includes insulating materials, binder and solvent；
On the basis of the total weight of the composition, the content of the insulating materials is 30 weight %-50 weight %, the bonding
The content of agent is 2 weight %-5 weight %, and the content of the solvent is 48 weight %-68 weight %；
The insulating materials is ceramic material, and the binder is the Kynoar that intrinsic viscosity is not less than 2.2dl/g, described
Solvent is N-Methyl pyrrolidone；
The insulating coating is made by following steps:
1) binder and first part's solvent are mixed, glue is made, glue obtained is placed in the condition that temperature is 10-30 DEG C
Lower placement 120-300 minutes；
2) glue obtained in step 1) and insulating materials are mixed, coating young bird material is made；
3) coating young bird material obtained in step 2) and second part solvent are mixed, insulating coating is made, insulation obtained is applied
Layer sieving, and the sieve pore being sieved is 120-150 mesh；
Wherein, on the basis of the total weight of the solvent, the dosage of first part's solvent is 80 weight %-90 weight %,
The dosage of the second part solvent is 10 weight %-20 weight %；
It is mixed into and is stirred in step 1), stirring rate 1200-1500r/min, mixing time 120-180min；With/
Or
It is mixed into and is stirred in step 2), stirring rate 1500-2000r/min, mixing time 240-360min；With/
Or
It is mixed into and is stirred in step 3), stirring rate 1500-2000r/min, mixing time 30-60min.
2. according to the method described in claim 1, wherein, the insulating materials is selected from aluminium oxide and/or boehmite.
3. according to the method described in claim 2, wherein, the partial size of the aluminium oxide and/or the boehmite is not more than 1 μm.
4. a kind of positive plate, which is characterized in that positive plate method system described in any one of -3 according to claim 1
?.
5. a kind of lithium ion battery, which is characterized in that the lithium ion battery includes positive plate according to claim 4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710036571.4A CN106784848B (en) | 2017-01-18 | 2017-01-18 | Insulating coating composition, the preparation method of insulating coating, positive plate and lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710036571.4A CN106784848B (en) | 2017-01-18 | 2017-01-18 | Insulating coating composition, the preparation method of insulating coating, positive plate and lithium ion battery |
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| CN106784848B true CN106784848B (en) | 2019-10-22 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109148888B (en) * | 2018-08-30 | 2021-01-26 | 成都市银隆新能源产业技术研究有限公司 | Lithium battery electrode plate and preparation method thereof |
| CN110380002B (en) * | 2019-06-03 | 2021-03-23 | 江西力能新能源科技有限公司 | Boehmite/alumina composite lithium ion battery coating pole piece |
| CN110911637B (en) * | 2019-12-05 | 2021-07-30 | 东莞塔菲尔新能源科技有限公司 | Negative plate, preparation method thereof and lithium ion battery |
| CN111564637A (en) * | 2020-05-19 | 2020-08-21 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece, preparation method thereof and lithium ion battery |
| CN111660015A (en) * | 2020-06-18 | 2020-09-15 | 昆山聚创新能源科技有限公司 | Laser die cutting method for pole piece |
| CN111777902B (en) * | 2020-07-24 | 2022-05-10 | 天津市捷威动力工业有限公司 | Preparation method of boehmite slurry for lithium ion battery |
| CN113471578B (en) * | 2021-06-04 | 2023-03-14 | 湖南领湃达志科技股份有限公司 | Power energy storage battery shell, preparation method and battery |
| CN113659103A (en) * | 2021-07-21 | 2021-11-16 | 合肥国轩高科动力能源有限公司 | Preparation method of pole piece for lithium ion battery |
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| CN104449011A (en) * | 2014-12-04 | 2015-03-25 | 中航锂电（洛阳）有限公司 | Lithium ion battery insulating coating, preparation method and pole piece and lithium ion battery using insulating coating |
| CN105244470A (en) * | 2015-09-11 | 2016-01-13 | 合肥国轩高科动力能源有限公司 | Positive plate of high-safety lithium-ion laminated battery and preparation method of positive plate |
| CN106129327A (en) * | 2016-08-10 | 2016-11-16 | 欣旺达电子股份有限公司 | Anode slice of lithium ion battery and lithium ion battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104449011A (en) * | 2014-12-04 | 2015-03-25 | 中航锂电（洛阳）有限公司 | Lithium ion battery insulating coating, preparation method and pole piece and lithium ion battery using insulating coating |
| CN105244470A (en) * | 2015-09-11 | 2016-01-13 | 合肥国轩高科动力能源有限公司 | Positive plate of high-safety lithium-ion laminated battery and preparation method of positive plate |
| CN106129327A (en) * | 2016-08-10 | 2016-11-16 | 欣旺达电子股份有限公司 | Anode slice of lithium ion battery and lithium ion battery |
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Address after: 226200 No.306 Heping South Road, Huilong Town, Qidong City, Nantong City, Jiangsu Province Patentee after: Jiangsu haisida power supply Co.,Ltd. Patentee after: JIANGSU NEW POWER BATTERY & MATERIAL ENGINEERING TECHNOLOGY RESEARCH CENTER CO.,LTD. Address before: 226200 No.306 Heping South Road, Huilong Town, Qidong City, Nantong City, Jiangsu Province Patentee before: JIANGSU HIGHSTAR BATTERY MANUFACTURING Co.,Ltd. Patentee before: JIANGSU NEW POWER BATTERY & MATERIAL ENGINEERING TECHNOLOGY RESEARCH CENTER CO.,LTD. |
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