CN109004161A - Caking property battery diaphragm and preparation method thereof - Google Patents
Caking property battery diaphragm and preparation method thereof Download PDFInfo
- Publication number
- CN109004161A CN109004161A CN201810635878.0A CN201810635878A CN109004161A CN 109004161 A CN109004161 A CN 109004161A CN 201810635878 A CN201810635878 A CN 201810635878A CN 109004161 A CN109004161 A CN 109004161A
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- China
- Prior art keywords
- caking property
- battery diaphragm
- ceramic particle
- coating
- flame
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Classifications
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
-
- 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/431—Inorganic material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention provides a kind of caking property battery diaphragm and preparation method thereof, and caking property battery diaphragm includes basement membrane and is set to epilamellar caking property coat, wherein the composition raw material of caking property coat includes Kynoar and organic solvent.The present invention provides a kind of coating paste, the caking property battery diaphragm coating formed by its preparation and the caking property battery diaphragm obtained based on it, coating paste of the invention is made of Kynoar (PVDF), and using organic solvent as solvent, solvent is used as relative to water etc., significantly improve the caking property to form battery diaphragm coating, the bond effect of finally obtained caking property battery diaphragm is greatly improved, and the service life of battery and each performance are effectively promoted.
Description
Technical field
The invention belongs to battery preparation technology fields, more particularly to a kind of caking property battery diaphragm and preparation method thereof.
Background technique
Lithium ion battery is usually mainly made of anode, cathode, diaphragm, electrolyte and battery case.Lithium ion battery
In structure, diaphragm is crucial one of interior layer assembly.The main function of diaphragm is to separate the positive and negative electrode of battery, is prevented
Positive and negative anodes directly contact and short-circuit, while electrolyte ion also to be enable to pass through in battery charge and discharge process, are formed
Electric current；When battery operating temperature is abnormal raising, the migrating channels of electrolyte ion are closed, cutting electric current guarantees battery peace
Entirely.It can be seen that the performance of diaphragm determines the interfacial structure of battery, internal resistance etc., directly affect the capacity of battery, circulation and
The characteristics such as security performance, the diaphragm haveing excellent performance play an important role the comprehensive performance for improving battery.Presently commercially available lithium
Ion battery diaphragm generally uses polyolefin porous membrane.However, existing diaphragm is all viscous in coating on base films coating, but generally
Knot property is not very well that service life and performance to battery etc. have a serious impact.
Therefore, how providing a kind of caking property battery diaphragm and preparation method thereof, real to solve the above technical problems belong to must
It wants.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of caking property battery diaphragm and systems
Preparation Method is unable to satisfy for solving the problems such as battery diaphragm viscosity is insufficient in the prior art and caused battery performance
It is required that the problems such as.
In order to achieve the above objects and other related objects, the present invention also provides a kind of caking property battery diaphragms, including basement membrane；
And it is set to the epilamellar caking property coat, wherein the composition raw material of the caking property coat includes gathering inclined fluorine
Ethylene and organic solvent.
As a preferred solution of the present invention, the weight ratio of the Kynoar and the organic solvent is between 1:10
Between~1:15.
As a preferred solution of the present invention, the organic solvent is selected from N-Methyl pyrrolidone, dimethylacetamide
One of amine, acetone, N,N-dimethylformamide and dimethyl sulfoxide or a variety of combinations.
As a preferred solution of the present invention, the caking property battery diaphragm further includes flame-retardant layer, wherein described fire-retardant
Layer is located on an at least surface for the basement membrane, and the caking property coat is located at the surface of the flame-retardant layer.
As a preferred solution of the present invention, the composition raw material of the flame-retardant layer includes that at least two particle sizes are different
Ceramic particle.
As a preferred solution of the present invention, the outer profile of the ceramic particle includes aspherical.
As a preferred solution of the present invention, the ceramic particle is in aluminium oxide, boehmite and magnesia
One or more combinations.
As a preferred solution of the present invention, the composition raw material of the flame-retardant layer includes the first ceramic particle and the second pottery
Porcelain particle, wherein the partial size of mono- ceramic particle of is greater than the partial size of second ceramic particle, and first ceramics
The specific surface area of particle is less than the specific surface area of second ceramic particle.
As a preferred solution of the present invention, the parts by weight range of first ceramic particle 68%-78% with
It is interior；The parts by weight range of second ceramic particle is within 25%-32%.
As a preferred solution of the present invention, the composition raw material of the flame-retardant layer includes the first ceramic particle and the second pottery
Porcelain particle, wherein the particle size range of first ceramic particle is within 550nm-580nm, the grain of second ceramic particle
Diameter range is within 220nm-480nm, and the specific surface area range of first ceramic particle is in 20m2/g-25m2It is described within/g
The specific surface area range of second ceramic particle is in 25m2/g-35m2Within/g.
As a preferred solution of the present invention, the thickness range of the caking property coat is within 1.8 μm -5 μm；Institute
The thickness range of flame-retardant layer is stated within 0.5 μm -1.3 μm.
The present invention also provides a kind of lithium ion battery, the lithium ion battery includes as described in above-mentioned any one scheme
Caking property battery diaphragm.
The present invention also provides a kind of preparation methods of caking property battery diaphragm, include the following steps:
1) basement membrane is provided；
2) ceramic slurry is prepared, the ceramic slurry is coated on an at least surface for the basement membrane, it is fire-retardant to be formed
Layer；
3) prepares coating slurry, and the coating paste is coated in the fire-retardant layer surface, to form caking property painting
Coating, wherein the coating paste includes Kynoar and organic solvent.
As a preferred solution of the present invention, in step 2), the ceramics are uniformly coated using gravure roll coating method
Slurry；In step 3), the coating paste, the coating speed model of the coating paste are uniformly coated using gravure roll coating method
It is trapped among within 60-80m/min；It further include the step being dried using more piece baking oven after the coating paste coating in step 3)
Suddenly.
As described above, coating paste of the invention, coating, caking property battery diaphragm and preparation method, have beneficial below
Effect:
The present invention is provided a kind of coating paste, the caking property battery diaphragm coating formed by its preparation and is obtained based on it
Caking property battery diaphragm, coating paste of the invention is made of Kynoar (PVDF), and using organic solvent as molten
Agent is used as solvent relative to water etc., significantly improves the caking property to form battery diaphragm coating, finally obtained caking property electricity
The bond effect of pond diaphragm is greatly improved, and the service life of battery and each performance are effectively promoted.
Detailed description of the invention
Fig. 1 is shown as the structural schematic diagram of caking property battery diaphragm provided by the invention.
Fig. 2 is shown as the preparation technology flow chart of caking property battery diaphragm provided by the invention.
Component label instructions
11 basement membranes
21 flame-retardant layers
22 caking property coats
S1~S3 step 1)~step 3)
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Fig. 1 is please referred to Fig. 2.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, though only show in diagram with related component in the present invention rather than package count when according to actual implementation
Mesh, shape and size are drawn, when actual implementation form, quantity and the ratio of each component can arbitrarily change for one kind, and its
Assembly layout form may also be increasingly complex.
As shown in Figure 1, the caking property battery diaphragm includes basement membrane the present invention also provides a kind of caking property battery diaphragm
11；And it is set to the epilamellar caking property coat 22, wherein the composition raw material of the caking property coat 22 includes
Kynoar and organic solvent.
As an example, the weight ratio of the Kynoar and the organic solvent is between 1:10~1:15.
As an example, the organic solvent is selected from N-Methyl pyrrolidone, dimethyl acetamide, acetone, N, N- diformazan
One of base formamide and dimethyl sulfoxide or a variety of combinations.
Specifically, in this example, constitute the coating paste of the caking property coat by Kynoar (pvdf) and
Organic solvent composition, organic solvent can be also possible to two kinds of combination or two or more among the above selected from one kind among the above
Combination, in addition, the weight ratio of the Kynoar and the organic solvent is preferably between 1:12-1:14, wherein this
In text " between ... between " and " ... within " refer to the numberical range including endpoint.The present invention carries out the painting of above-mentioned design
Layer slurry is controlled the suitable component ratio of Kynoar and organic solvent, is improved it and be prepared by the improvement of solvent
The caking property of coating has been widened and has obtained the application range of coating, and the performance for obtaining battery is improved.
As an example, the caking property battery diaphragm further includes flame-retardant layer 21, wherein the flame-retardant layer 21 is located at the base
On an at least surface for film 11, the caking property coat 22 is located at the surface of the flame-retardant layer 21.
Specifically, including using painting provided by the invention in the structure the present invention also provides a kind of structure of battery diaphragm
The battery diaphragm coating of layer slurry preparation, so as to improve the caking property of battery diaphragm, in a preferred embodiment, battery
Membrane configuration further includes flame-retardant layer 21, wherein institute other than including above-mentioned battery diaphragm coating (the i.e. described caking property coat)
It states flame-retardant layer 21 to be formed on the surface of the basement membrane 11, the specific position that coats is selected according to actual conditions, it is preferable that described
The opposite two sides of basement membrane 11, which respectively coat, forms one layer of flame-retardant layer, in addition, in a preferred embodiment, the caking property coat
22 are arranged on the surface of each described flame-retardant layer far from the basement membrane and corresponding thereto, certainly, the not shape of the basement membrane 11
The caking property coat 22 can also be coated at the surface of the flame-retardant layer, depending on actual conditions.
As an example, the composition raw material of the flame-retardant layer 21 includes the different ceramic particle of at least two particle sizes.
As an example, the outer profile of the ceramic particle includes aspherical.
As an example, the type of the ceramic particle includes inorganic filler, is selected from aluminium oxide, boehmite, oxidation
The combination of one or both of magnesium or more.
Specifically, this example provides a kind of composition of flame-retardant layer, in one example, it is made of ceramic slurry, Ye Jiyou
Ceramic particle is constituted, and in a preferable example, is made of the different ceramic particle of particle size, such as can be by two kinds of particle sizes
Ceramic particle constitute, can also be made of three kinds and three kinds or more of ceramic particle, the difference of ceramic particle partial size is conducive to
The flame-retarding characteristic and compactness etc. of the flame-retardant layer formed are improved, it, can also be at this point it is possible to using the ceramic material of identical type
Select different types of ceramic material.In addition, in one example, the ceramic particle of at least one of described ceramic particle partial size
The pattern of outer profile is aspherical, such as spheroid shape, irregular shape, certainly, in a preferred embodiment, all particle sizes
Ceramic particle is selected as aspherical particle, so as to be conducive to enhance the cementitiousness of particle and solvent.
As an example, the composition raw material of the flame-retardant layer includes the first ceramic particle and the second ceramic particle, wherein described
The partial size of first ceramic particle is greater than the partial size of second ceramic particle, and the specific surface area of first ceramic particle is less than
The specific surface area of second ceramic particle.
As an example, the parts by weight range of first ceramic particle is within 68%-78%；Second ceramics
The parts by weight range of grain is within 25%-32%.
Specifically, this example provides the composition of another flame-retardant layer, the ceramic particle including two kinds of particle sizes is gone forward side by side
The specific surface area that one step both controls during selecting ceramic particle, thus at above-mentioned group of particle size and specific surface area
It can be further improved the flame-retarding characteristic of flame-retardant layer under conjunction, and be conducive to the formation and performance raising of subsequent caking property coat.
Further, in a further preferred embodiment, the parts by weight for controlling first ceramic particle are greater than institute
State the parts by weight of the second ceramic particle, it is preferable that the parts by weight range of first ceramic particle 70%-75% with
It is interior；The parts by weight range of second ceramic particle is within 27%-30%.
As an example, the composition raw material of the flame-retardant layer includes the first ceramic particle and the second ceramic particle, wherein described
The particle size range of first ceramic particle is within 550nm-580nm, preferably within 560nm-570nm, second ceramics
The particle size range of grain is within 220nm-480nm, preferably within 300nm-400nm, the specific surface of first ceramic particle
Product range is in 20m2/g-25m2Within/g, preferably in 21m2/g-24m2Within/g, the specific surface area model of second ceramic particle
It is trapped among 25m2Within/g-35m2/g, preferably in 28m2/g-32m2Within/g.
As an example, the thickness range of the caking property coat is within 1.8 μm -5 μm, preferably at 2.5 μm -3.5 μm
Within；The thickness range of the flame-retardant layer is within 0.5 μm -1.3 μm, preferably within 0.8 μm -1.1 μm.In addition, of the invention
Basement membrane include polyethylene micropore diaphragm, thickness range is within 7 μm -11 μm, 9 μm of this example selection.
The present invention provides a kind of coating paste for being used to prepare caking property battery diaphragm, and the component of the coating paste includes
Kynoar and organic solvent, wherein the weight ratio of the Kynoar and the organic solvent is between 1:10~1:15
Between.
As an example, the organic solvent is selected from N-Methyl pyrrolidone, dimethyl acetamide, acetone, N, N- diformazan
One of base formamide and dimethyl sulfoxide or a variety of combinations.
Specifically, in this example, coating paste is made of Kynoar (pvdf) and organic solvent, and organic solvent can
To be also possible to two kinds of combination among the above or two or more combinations, in addition, described gather inclined fluorine selected from one kind among the above
The weight ratio of ethylene and the organic solvent is preferably between 1:12-1:14, wherein herein " between ... between " and
" ... within " refer to the numberical range including endpoint.The present invention carries out the coating paste of above-mentioned design, by the improvement of solvent,
The suitable component ratio for controlling Kynoar and organic solvent, improves its caking property that coating is prepared, widens terrible
To the application range of coating, the performance for obtaining battery is improved.
The present invention also provides a kind of caking property battery diaphragm coatings, which is characterized in that the caking property battery diaphragm coating
The coating paste as described in any one of above scheme is prepared.
As shown in Fig. 2, the present invention also provides a kind of preparation methods of caking property battery diaphragm, wherein provided by the invention
Caking property battery diaphragm preferably uses this preparation method to be prepared, and includes the following steps:
1) basement membrane 11 is provided；
2) ceramic slurry is prepared, the ceramic slurry is coated on an at least surface for the basement membrane, it is fire-retardant to be formed
Layer 21；
3) prepares coating slurry, and the coating paste is coated on 21 surface of flame-retardant layer, to form caking property
Coat 22, wherein the coating paste includes Kynoar and organic solvent.
Specifically, the present invention also provides a kind of preparation methods of caking property battery diaphragm, wherein the institute formed in step 2)
It states flame-retardant layer and preferably uses the flame-retardant layer of the invention provided in the description of caking property battery diaphragm, constitute raw material and also use
Present invention ceramic slurry provided in the description of caking property battery diaphragm namely above-mentioned ceramic particle, wherein preparation ceramics
Slurry namely ceramic slurry is prepared according to the proportion for constituting fire-retardant layer component.In addition, the coating paste in step 3) preferably uses
Provided by the present invention for preparing the coating paste of caking property battery diaphragm, wherein prepares coating slurry namely retouched according to above-mentioned
The component proportion prepares coating slurry that the coating stated is constituted.
As an example, the weight ratio of the Kynoar and the organic solvent is between 1:10~1:15.
As an example, the organic solvent is selected from N-Methyl pyrrolidone, dimethyl acetamide, acetone, N, N- diformazan
One of base formamide and dimethyl sulfoxide or a variety of combinations.
As an example, the composition raw material of the flame-retardant layer, i.e., the described ceramic slurry includes that at least two particle sizes are different
Ceramic particle.
As an example, the outer profile of the ceramic particle includes aspherical.
As an example, the ceramic particle is selected from one of aluminium oxide, boehmite and magnesia or a variety of combinations.
As an example, the composition raw material of the flame-retardant layer, i.e., the described ceramic slurry includes the first ceramic particle and the second pottery
Porcelain particle, wherein the partial size of first ceramic particle is greater than the partial size of second ceramic particle, and first ceramics
The specific surface area of grain is less than the specific surface area of second ceramic particle.
As an example, the parts by weight range of first ceramic particle is within 68%-78%；Second ceramics
The parts by weight range of grain is within 25%-32%.
As an example, the composition raw material of the flame-retardant layer, i.e., the described ceramic slurry includes the first ceramic particle and the second pottery
Porcelain particle, wherein the particle size range of first ceramic particle is within 550nm-580nm, the grain of second ceramic particle
Diameter range is within 220nm-480nm, and the specific surface area range of first ceramic particle is in 20m2/g-25m2It is described within/g
The specific surface area range of second ceramic particle is in 25m2/g-35m2Within/g.
As an example, uniformly coating the ceramic slurry using gravure roll coating method in step 2)；In step 3), adopt
The coating paste is uniformly coated with gravure roll coating method, the coating speed range of the coating paste is in 60m/min-80m/
Within min；In step 3), further include the steps that being dried using more piece baking oven after the coating paste coating.
Specifically, the coating speed of the coating paste is selected as 70m/min, and passes through after coating in a preferable example
Cross 5 section oven dryings, oven temperature range is followed successively by 63-67 DEG C, and 71-79 DEG C, 71-79 DEG C, 71-79 DEG C, 68-72 DEG C, preferably
Oven temperature is followed successively by 65 DEG C, 75 DEG C, 75 DEG C, 75 DEG C, 70 DEG C, obtains required lithium ion battery separator after dry.
In addition, the lithium ion battery includes such as above-mentioned any one scheme the present invention also provides a kind of lithium ion battery
The caking property battery diaphragm, the present invention also provides a kind of preparation method of lithium ion battery, the system of the lithium ion battery
Preparation Method includes the steps that preparing battery diaphragm using the preparation method of the battery diaphragm as described in above-mentioned any one scheme.This
The invention lithium ion battery is preferably prepared using the preparation method of lithium ion battery provided by the invention.Using this hair
The lithium ion battery that bright caking property battery diaphragm obtains, adhesive property are greatly improved, the service life of battery and each performance
Effectively promoted.
Method structure, preparation and effect of the invention are further illustrated below with reference to specific example data.
1): weighing partial size is 3 μm of alumina powder 20Kg, is added in 40Kg water and is sufficiently stirred that be made into aluminium oxide water-soluble
The sodium hexametaphosphate solution 1.3Kg that solid content is 35% is added in liquid, stirring 30min is fully ground, so that the partial size of particulate matter
Between 0.5-3 μm, the hydroxypropyl guar glue solution 4Kg that solid content 35% is then added is stirred evenly range, is made and is contained admittedly
Amount is 35% ceramic slurry；
2) the cosolvent LiCl for weighing 0.1Kg, which is added in the first solvent acetone of 3Kg, to be stirred to being completely dissolved, side stirring
While be slowly added to molecular weight be 10-100 ten thousand dispersing agent polyethylene glycol oxide powder 0.1Kg and 0.1Kg aluminium oxide stir to
It is uniformly dispersed, is slow added into Kynoar solution (Kynoar content is 8%) 7Kg and stirs evenly, can be prepared by gathering
Vinylidene slurry；
3) obtained ceramic slurry is coated uniformly on basement membrane using gravure roll coating method by the basement membrane for taking 9 μ m thicks
Unilateral side, then obtained pvdf slurry is coated uniformly on to the unilateral side of basement membrane.Coating speed is 75m/min, coated film warp
It is directly entered five section baking ovens after coating to be dried, oven temperatures at different levels are respectively 60 DEG C, 70 DEG C, 75 DEG C, 75 DEG C, 75 DEG C, are done
Can be obtained lithium ion battery separator after dry, the lithium ion battery separator with a thickness of 9 μm, coating layer thickness is 5 μm.Through
The caking property for crossing the battery diaphragm that the above process obtains is significantly improved, and properties are advanced optimized.
In conclusion the present invention provides a kind of caking property battery diaphragm and preparation method thereof, the caking property battery diaphragm
Including basement membrane and it is set to the epilamellar caking property coat, wherein the composition raw material packet of the caking property coat
Include Kynoar and organic solvent.The caking property battery diaphragm painting that the present invention provides a kind of coating paste, formed by its preparation
Layer and based on the caking property battery diaphragm that it is obtained, coating paste of the invention is made of Kynoar (PVDF), and is adopted
It uses organic solvent as solvent, is used as solvent relative to water etc., significantly improves the caking property to form battery diaphragm coating, most
The bond effect of the caking property battery diaphragm obtained eventually is greatly improved, and the service life of battery and each performance are effectively mentioned
It rises.So the present invention effectively overcomes various shortcoming in the prior art and has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (13)
1. a kind of caking property battery diaphragm, which is characterized in that the caking property battery diaphragm includes basement membrane and is set to described
Epilamellar caking property coat, wherein the composition raw material of the caking property coat includes Kynoar and organic solvent.
2. caking property battery diaphragm according to claim 1, which is characterized in that the Kynoar with it is described organic molten
The weight ratio of agent is between 1:10~1:15.
3. caking property battery diaphragm according to claim 1, which is characterized in that the organic solvent is selected from N- methyl pyrrole
One of pyrrolidone, dimethyl acetamide, acetone, N,N-dimethylformamide and dimethyl sulfoxide or a variety of combinations.
4. caking property battery diaphragm described in any one of -3 according to claim 1, which is characterized in that the caking property battery
Diaphragm further includes flame-retardant layer, wherein the flame-retardant layer is located on an at least surface for the basement membrane, caking property coat position
In the surface of the flame-retardant layer.
5. caking property battery diaphragm according to claim 4, which is characterized in that the thickness range of the caking property coat
Within 1.8 μm -5 μm；The thickness range of the flame-retardant layer is within 0.5 μm -1.3 μm.
6. caking property battery diaphragm according to claim 4, which is characterized in that the composition raw material of the flame-retardant layer includes extremely
The different ceramic particle of few two kinds of particle sizes.
7. caking property battery diaphragm according to claim 6, which is characterized in that the outer profile of the ceramic particle includes non-
It is spherical；The ceramic particle is selected from one of aluminium oxide, boehmite and magnesia or a variety of combinations.
8. caking property battery diaphragm according to claim 6, which is characterized in that the composition raw material of the flame-retardant layer includes the
One ceramic particle and the second ceramic particle, wherein the partial size of mono- ceramic particle of is greater than the grain of second ceramic particle
Diameter, and the specific surface area of first ceramic particle is less than the specific surface area of second ceramic particle.
9. caking property battery diaphragm according to claim 8, which is characterized in that the parts by weight of first ceramic particle
Range is within 68%-78%；The parts by weight range of second ceramic particle is within 25%-32%.
10. caking property battery diaphragm according to claim 6, which is characterized in that the composition raw material of the flame-retardant layer includes
First ceramic particle and the second ceramic particle, wherein the particle size range of first ceramic particle within 550nm-580nm,
Within 220nm-480nm, the specific surface area range of first ceramic particle exists the particle size range of second ceramic particle
20m2/g-25m2Within/g, the specific surface area range of second ceramic particle is in 25m2/g-35m2Within/g.
11. a kind of lithium ion battery, which is characterized in that the lithium ion battery includes such as any one of claim 1-10 institute
The caking property battery diaphragm stated.
12. a kind of preparation method of caking property battery diaphragm, which comprises the steps of:
1) basement membrane is provided；
2) ceramic slurry is prepared, the ceramic slurry is coated on an at least surface for the basement membrane, to form flame-retardant layer；
3) prepares coating slurry, and the coating paste is coated in the fire-retardant layer surface, to form caking property coat,
Wherein, the coating paste includes Kynoar and organic solvent.
13. caking property battery diaphragm according to claim 12, which is characterized in that in step 2), be coated with using gravure roll
Mode uniformly coats the ceramic slurry；In step 3), the coating paste is uniformly coated using gravure roll coating method, it is described
The coating speed range of coating paste is within 60m/min-80m/min；In step 3), further include after the coating paste coating
The step of being dried using more piece baking oven.
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| CN201810635878.0A CN109004161A (en) | 2018-06-20 | 2018-06-20 | Caking property battery diaphragm and preparation method thereof |
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| CN201810635878.0A CN109004161A (en) | 2018-06-20 | 2018-06-20 | Caking property battery diaphragm and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742298A (en) * | 2019-01-08 | 2019-05-10 | 桑顿新能源科技有限公司 | Porous ceramics diaphragm slurry and preparation method thereof, battery diaphragm and battery |
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Address after: 201399 No. 155 Nanlu Highway, Pudong New Area, Shanghai Applicant after: SHANGHAI ENJIE NEW MATERIAL TECHNOLOGY Co.,Ltd. Address before: 201399 No. 155 Nanlu Highway, Pudong New Area, Shanghai Applicant before: SHANGHAI ENERGY NEW MATERIALS TECHNOLOGY Co.,Ltd. |
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Application publication date: 20181214 |