CN108305972A - A kind of ceramic-coated separator and preparation method and application - Google Patents
A kind of ceramic-coated separator and preparation method and application Download PDFInfo
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- CN108305972A CN108305972A CN201711490079.0A CN201711490079A CN108305972A CN 108305972 A CN108305972 A CN 108305972A CN 201711490079 A CN201711490079 A CN 201711490079A CN 108305972 A CN108305972 A CN 108305972A
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- inorganic particle
- coated separator
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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
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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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
- 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
-
- 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
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
-
- 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
This application discloses a kind of ceramic-coated separator and preparation method and application.The ceramic-coated separator of the application, including basement membrane and the ceramic coating coated at least one surface of basement membrane, wherein ceramic coating is coated with by the inorganic particle of surface grafting polyethylene glycol.The ceramic-coated separator of the application, the creative inorganic particle using surface grafting polyethylene glycol prepares ceramic coating, so that the interface binding power of inorganic particle and basement membrane is more preferable, improve the peel strength of ceramic-coated separator entirety, retaining the features such as ceramic coating high temperature resistant simultaneously, but solve inorganic particle fall off, dusting problems.The dispersion effect of the inorganic particle of surface grafting polyethylene glycol in water is more preferable so that ceramic-coated separator uniformity is more preferable.Faster, imbibition rate higher forms gel after Electolyte-absorptive so that ceramic-coated separator can preferably be fitted in electrode surface to the ceramic coating rate of liquid aspiration formed using the inorganic particle of surface grafting polyethylene glycol.
Description
Technical field
This application involves lithium ion battery separator fields, more particularly to a kind of ceramic-coated separator and preparation method and answer
With.
Background technology
Lithium ion battery separator is a kind of perforated membrane.Main function of the lithium ion battery separator in lithium ion battery be every
From battery plus-negative plate, internal short-circuit of battery is prevented；The channel of migration of the lithium ion in charge and discharge process is provided, lithium ion is allowed
Pass through.Preceding commercialized diaphragm is broadly divided into dry method simple tension diaphragm, wet method biaxial tension diaphragm.Referring to patent
US5480745、JP2004323820。
To further increase the ability of lithium battery diaphragm Electolyte-absorptive, promoting the thermal stability of diaphragm and resisting lithium branch
Brilliant ability, usually in membrane surface complex fire resistant coating.Ceramics due to that can disperse in water, and the feature of environmental protection is good, at present
Through being widely used in the coating of diaphragm, to be prepared into the good refractory ceramics coated separator of thermal stability.But ceramics are used as inorganic material
Expect, unstressed conduction between ceramic particle so that the mechanical strength of ceramic-coated separator declines serious；And ceramic particle is inorganic
The poor compatibility of material and organic barrier film basement membrane so that ceramic particle is easy to fall off, that is, is lost powder, and the resistance to of ceramic-coated separator is caused
High-temperature behavior declines, and influences battery performance.
Invention content
The purpose of the application is to provide a kind of new ceramic-coated separator and preparation method and application.
To achieve the goals above, the application uses following technical scheme：
The one side of the application discloses a kind of ceramic-coated separator, including basement membrane and is coated at least one surface of basement membrane
Ceramic coating, wherein ceramic coating is coated with by the inorganic particle of surface grafting polyethylene glycol.
It is applied using the inorganic particle preparation ceramics of surface grafting polyethylene glycol it should be noted that the application is creative
Layer, on the one hand, so that the ceramic-coated separator thermal stability of the application is good, high temperature resistant, the energy with preferable resistance Li dendrite
Power；On the other hand, the inorganic particle of surface grafting polyethylene glycol and the interface binding power of basement membrane are more preferable, not easily to fall off, no picking
Phenomenon, and make the application ceramic-coated separator rate of liquid aspiration faster, imbibition rate higher, and after Electolyte-absorptive be easy
Gel is formed, electrode surface can be preferably fitted in.Wherein, rate of liquid aspiration can improve the efficiency of battery production soon；It inhales
Liquid rate height can speed up the rate of battery charging and discharging and improve battery life；Gel, that is, gluing state is formed, is conducive to be bonded
Electrode surface can improve the consistency of internal resistance after fitting, extend the service life of battery.In addition, the surface that the application uses
Be grafted the inorganic particle of polyethylene glycol, dispersion effect in water is more preferable so that the ceramic coating of preparation evenly so that
The ceramic-coated separator performance of the application is more reliable and more stable.
It is appreciated that the key of the application is to prepare ceramic coating using the inorganic particle of surface grafting polyethylene glycol,
As for the concrete type of inorganic particle, inorganic particle used by existing ceramic coating can be referred to.But the application's is excellent
It selects in scheme, in order to reach better effect, inorganic particle is particularly limited to, following technical scheme is referred to.
Preferably, the ceramic-coated separator of the application is more than 40N/m in the peel strength of 180 degree angle.
It should be noted that the ceramic-coated separator of the application, due to the inorganic particle using surface grafting polyethylene glycol
Preparing ceramic coating so that the binding force of ceramic coating and basement membrane is more preferable, not easily to fall off, no picking phenomenon, also, the application
In realization method, the application ceramic-coated separator is more than 40N/m in the peel strength of 180 degree angle, in embodiments herein
For peel strength all in 70N/m or more, highest can reach 98N/m, and the binding force of ceramic coating and basement membrane is strong, has ensured ceramic painting
The properties of layer diaphragm, avoid the influence that ceramic coating falls off to diaphragm or battery.
Preferably, basement membrane is MIcroporous polyolefin film.It is furthermore preferred that MIcroporous polyolefin film is polyethene microporous membrane, polypropylene
The two or more layers composite membrane of microporous barrier or polyethene microporous membrane and microporous polypropylene membrane composition.
Preferably, inorganic particle is selected from alundum (Al2O3), silica, zirconium dioxide, titanium dioxide, zinc oxide, oxidation
At least one of magnesium, calcium carbonate, magnesium hydroxide, aluminium hydroxide and boehmite.
Preferably, the thickness of basement membrane is 5-60 μm, porosity 10%-60%, and aperture is 0.01-0.5 μm.
The another side of the application discloses application of the ceramic-coated separator of the application in lithium ion battery.
The another side of the application discloses a kind of lithium ion battery of the ceramic-coated separator using the application.
It should be noted that due to the ceramic-coated separator of the application, ceramic coating is not easily to fall off, no picking phenomenon,
Influence of the picking to performance of lithium ion battery is avoided, stability and the safety of lithium ion battery are improved；Also, the application
Ceramic-coated separator rate of liquid aspiration is fast, imbibition rate higher, and form gel after Electolyte-absorptive and so that diaphragm is better
It is fitted in electrode surface so that the overall performance of lithium ion battery is more preferable.
The preparation method of the ceramic-coated separator for disclosing the application on one side again of the application, includes the following steps,
Amino is added by inorganic particle dispersion to ethyl alcohol in the step of preparing the inorganic particle of surface grafting polyethylene glycol
Silane coupling agent reacts 1-4 hours at 20 DEG C -80 DEG C, pH value 6-8, and reaction product, which is washed the dry surface that obtains, carries amino
Inorganic particle；The inorganic particle of condensing agent, surface with amino, polyethylene glycol three of the end group with carboxyl are mixed,
20 DEG C -50 DEG C are stirred to react 1-8 hours, and then, washing obtains the inorganic particle of surface grafting polyethylene glycol；
The step of preparing coating slurry, by the inorganic particle dispersion to water of surface grafting polyethylene glycol, stirs evenly, and makes
At coating slurry；
The step of preparing ceramic-coated separator：Coating slurry is coated on at least one surface of the basement membrane, obtains institute
State ceramic-coated separator.
It should be noted that in the preparation method of the application, wherein prepare the inorganic particle of surface grafting polyethylene glycol
Step, the method for comparing other surface grafting polymerization objects, the application are not necessarily to organic solvent, more environmentally-friendly, safety.
Preferably, condensing agent is 1- (3- dimethylamino-propyls) -3- ethyl-carbodiimide hydrochlorides, chloro- 4, the 6- diformazans of 2-
Oxy-1, at least one of 3,5- triazines and N- hydroxysuccinimides.
It should be noted that the effect of condensing agent is that the amino of inorganic particle surfaces and the carboxyl of polyethylene glycol is made to contract
Reaction is closed, to make polyethylene glycol be grafted on inorganic particle surfaces；Based on the principle, however not excluded that can also can be promoted using other
Into the chemical reagent of condensation reaction, it is not specifically limited herein.
Preferably, the step of preparing ceramic-coated separator further includes that coating slurry is coated at least the one of the basement membrane
Behind a surface, heating volatilization moisture content obtains ceramic-coated separator；Wherein, the temperature of heating is 30-80 DEG C, time 5-72s.
Preferably, coating by blade rubbing method, Meyer rod coating method, reverse roll coating method, intaglio plate roller coating method, dip-coating,
At least one of brush.
Due to using the technology described above, the advantageous effect of the application is：
The ceramic-coated separator of the application, the creative inorganic particle using surface grafting polyethylene glycol prepare ceramics and apply
Layer so that the interface binding power of inorganic particle and basement membrane is more preferable, improves the peel strength of ceramic-coated separator entirety, also,
While the features such as the high temperature resistant for remaining ceramic coating, and solve the problems, such as that inorganic particle falls off, loses powder well.Table
It is more preferable that face is grafted the dispersion effect of the inorganic particle of polyethylene glycol in water so that the ceramic-coated separator uniformity of preparation is more
It is good.Using surface grafting polyethylene glycol inorganic particle formed ceramic coating rate of liquid aspiration faster, imbibition rate higher, and inhale
Receive electrolyte after be easy to form gel so that ceramic-coated separator can preferably be fitted in electrode surface, improve lithium from
The whole synthesis performance of sub- battery.
Description of the drawings
Fig. 1 is the schematic diagram of peel strength test in the embodiment of the present application；
Fig. 2 is the structural schematic diagram of ceramic-coated separator in the embodiment of the present application.
Specific implementation mode
In existing ceramic-coated separator, inorganic particle is easy to fall off, and picking phenomenon occurs, is the one of ceramic-coated separator
Hang-up.The application has found during carrying out long-term production practices and research to ceramic-coated separator, is connect using surface
The inorganic particle of branch polyethylene glycol prepares ceramic coating, can not only retain the feature of ceramic coating itself, but also can be very good to solve
The problem of certainly inorganic particle falls off.
According to the above research, this application provides a kind of ceramic-coated separator, including basement membrane and it is coated in basement membrane at least one
The ceramic coating on a surface, wherein ceramic coating is coated with by the inorganic particle of surface grafting polyethylene glycol.The pottery of the application
Porcelain coated separator, structure as shown in Fig. 2, surface grafting polyethylene glycol inorganic particle, the actually table in inorganic particle 21
Face forms a strata ethylene glycol clad 211, forms the particle of nucleocapsid, is then coated in 22 surface of basement membrane.Surface
The interface binding power of the inorganic particle and basement membrane that are grafted polyethylene glycol is more preferable, not easily to fall off, to solve ceramic-coated separator
Dusting problems.
The application is described in further detail below by specific embodiments and the drawings.Following embodiment is only to the application
It is further described, should not be construed as the limitation to the application.
Embodiment 1
This example uses 16 μm of Shenzhen Zhong Xing innovative materials Technology Co., Ltd. thickness, porosity 40%, aperture 0.02-
0.03 μm of microporous polypropylene membrane is as basement membrane；Using the alundum (Al2O3) of surface grafting polyethylene glycol, the ceramics of this example are prepared
Coated separator；Wherein, alundum (Al2O3) is purchased from SUMITOMO CHEMICAL, and grain size is D500.50-0.82 μm.Specific preparation method is as follows：
1. the preparation of surface grafting polyethylene glycol alundum (Al2O3)
Alundum (Al2O3) particle is distributed in ethyl alcohol, amino silicane coupling agent is added, at 60 DEG C, pH value 6.5 or so, instead
3h is answered, reaction product is washed into the dry alundum (Al2O3) for obtaining surface and carrying amino；Condensing agent, surface are carried the three of amino
The polyethylene glycol three of Al 2 O, end group with carboxyl mixes, and is stirred to react at 50 DEG C 1 hour, then, washing obtains surface
It is grafted the alundum (Al2O3) of polyethylene glycol.The condensing agent that this example uses is 1- (3- dimethylamino-propyls) -3- ethyl carbodiimide
Hydrochloride and N- hydroxysuccinimides.
2. preparing coating slurry
Directly by the alundum (Al2O3) 40g of prepared surface grafting polyethylene glycol, carboxymethyl cellulose class viscosity-adjusting agent
Agent 1g, polyacrylate binder 1g, is distributed in 58g deionized waters, stirs 1-3h, coating slurry is made.
The coating slurry of preparation is coated uniformly on using rolling method on a surface of basement membrane, 70 DEG C of baking ovens are subsequently placed in
Middle drying makes moisture evaporation, that is, obtains the ceramic-coated separator that the coating layer thickness of this example is 4 microns.
Embodiment 2-7
Embodiment 2-7 is prepared for the silica of surface grafting polyethylene glycol, zirconium dioxide, titanium dioxide, oxidation respectively
Zinc, magnesia, calcium carbonate, are used to prepare ceramic-coated separator.It is specific as follows：
Embodiment 2 is similar to Example 1, except that replacing alundum (Al2O3) using silica, forms surface and connects
The silica of branch polyethylene glycol, is used to prepare ceramic-coated separator.Remaining condition is same as Example 1.Wherein, silica
Grain size is D50 0.50-0.61 μm.
Embodiment 3 is similar to Example 1, except that replacing alundum (Al2O3) using zirconium dioxide, forms surface and connects
The zirconium dioxide of branch polyethylene glycol, is used to prepare ceramic-coated separator.Remaining condition is same as Example 1.Wherein, zirconium dioxide
Grain size is D50 0.82-1.13 μm.
Embodiment 4 is similar to Example 1, except that replacing alundum (Al2O3) using titanium dioxide, forms surface and connects
The titanium dioxide of branch polyethylene glycol, is used to prepare ceramic-coated separator.Remaining condition is same as Example 1.Wherein, titanium dioxide
Grain size is D50 0.38-0.67 μm.
Embodiment 5 is similar to Example 1, except that replacing alundum (Al2O3) using zinc oxide, forms surface grafting
The zinc oxide of polyethylene glycol, is used to prepare ceramic-coated separator.Remaining condition is same as Example 1.Wherein, zinc oxide grain size is
D50 0.63-0.99μm。
Embodiment 6 is similar to Example 1, except that replacing alundum (Al2O3) using magnesia, forms surface grafting
The magnesia of polyethylene glycol, is used to prepare ceramic-coated separator.Remaining condition is same as Example 1.Wherein, magnesia grain size is
D50 0.58-0.85μm。
Embodiment 7 is similar to Example 1, except that replacing alundum (Al2O3) using calcium carbonate, forms surface grafting
The calcium carbonate of polyethylene glycol, is used to prepare ceramic-coated separator.Remaining condition is same as Example 1.Wherein, calcium carbonate grain size is
D50 0.66-0.83μm。
Comparative example 1-7
Comparative example 1-7 is sequentially corresponding with embodiment 1-7, except that directly could be used without the inorganic particle of surface grafting
Ceramic-coated separator is prepared, it is specific as follows：
Comparative example 1 is directly dispersed in water using the alundum (Al2O3) of 1 identical source of embodiment and specification, and coating materials are made
Expect, each component and dosage are all same as Example 1 in coating slurry, then obtain identical painting thickness using identical preparation method
The ceramic-coated separator of degree.In addition to alundum (Al2O3) does not have surface grafting polyethylene glycol, including basement membrane etc. all with 1 phase of embodiment
Together.
Comparative example 2 is directly dispersed in water using the silica of 2 identical source of embodiment and specification, and coating materials are made
Expect, each component and dosage are all same as Example 2 in coating slurry, then obtain identical painting thickness using identical preparation method
The ceramic-coated separator of degree.In addition to silica does not have surface grafting polyethylene glycol, including basement membrane etc. all with 2 phase of embodiment
Together.
Comparative example 3 is directly dispersed in water using the zirconium dioxide of 3 identical source of embodiment and specification, and coating materials are made
Expect, each component and dosage are all same as Example 3 in coating slurry, then obtain identical painting thickness using identical preparation method
The ceramic-coated separator of degree.In addition to zirconium dioxide does not have surface grafting polyethylene glycol, including basement membrane etc. all with 3 phase of embodiment
Together.
Comparative example 4 is directly dispersed in water using the titanium dioxide of 4 identical source of embodiment and specification, and coating materials are made
Expect, each component and dosage are all same as Example 4 in coating slurry, then obtain identical painting thickness using identical preparation method
The ceramic-coated separator of degree.In addition to titanium dioxide does not have surface grafting polyethylene glycol, including basement membrane etc. all with 4 phase of embodiment
Together.
Comparative example 5 is directly dispersed in water using the zinc oxide of 5 identical source of embodiment and specification, and coating slurry is made,
Each component and dosage are all same as Example 5 in coating slurry, then obtain identical coating layer thickness using identical preparation method
Ceramic-coated separator.It is all same as Example 5 including basement membrane etc. in addition to zinc oxide does not have surface grafting polyethylene glycol.
Comparative example 6 is directly dispersed in water using the magnesia of 6 identical source of embodiment and specification, and coating slurry is made,
Each component and dosage are all same as Example 6 in coating slurry, then obtain identical coating layer thickness using identical preparation method
Ceramic-coated separator.It is all same as Example 6 including basement membrane etc. in addition to magnesia does not have surface grafting polyethylene glycol.
Comparative example 7 is directly dispersed in water using the calcium carbonate of 7 identical source of embodiment and specification, and coating slurry is made,
Each component and dosage are all same as Example 7 in coating slurry, then obtain identical coating layer thickness using identical preparation method
Ceramic-coated separator.It is all same as Example 7 including basement membrane etc. in addition to calcium carbonate does not have surface grafting polyethylene glycol.
To the peel strength of the ceramic-coated separator of above example and comparative example, high temperature resistance, imbibition rate and pole piece
Cohesive force is tested.The specific test method is as follows：
Peel strength, test method are carried out with reference to GB/T 2792-1998, and the sample of 20*80mm sizes is cut out along the directions MD of film
Product 5, as shown in Figure 1, sample is sticked on stainless steel plate 2 with the standard rubber band 3 of 3M, then in the electronic tensile machine thought carefully
On, it with the speed of 300mm/min, is removed along 180 ° of directions, basement membrane 11 and coating 12 is made to remove, after experiment, software
It can automatically process, export the peel strength value of sample.The average value of 5 sample peel strengths is its peel strength.
High temperature resistance is heat-shrinked, and test method is carried out with reference to GB/T 12027-2004, is taken along the directions MD and TD of film
5 each more than or equal to the sample of 100mm × 100mm, the actual size of sample is measured, then specimen holder in two panels A4 paper
Between, after oven temperature stabilization, sample is put into baking oven, is taken out after 120 DEG C of heating 1h, measures the size after heating and calculating
Shrinking percentage.The average value that 5 samples are heat-shrinked is its thermal contraction.
Imbibition rate cuts out 5, the sample of 100*100mm sizes, weighs quality, every sample is dipped in conventional electrolysis liquid
10min takes out sample, the electrolyte on surface is blotted with filter paper, weighs quality again, calculates quality increased hundred after leaching electrolyte
Score, as imbibition rate.The average value of 5 sample imbibition rates is its imbibition rate.
Pole piece cohesive force cuts out 5, the sample of 20*100mm sizes, the tertiary cathode of 30*65mm sizes 5, in 0.9Mpa
Pressure, under the conditions of 90 DEG C, hot pressing 5min tests the cohesive force of diaphragm and pole piece then according to the test method of peel strength.
Every test result is as shown in table 1.
1 membrane properties test result of table
Table 1 the results show that the peel strength of each embodiment diaphragm of the application is increased substantially than comparative example, avoid production
The problem of product lose powder in use improves the security performance of battery.Meanwhile comparative example diaphragm and pole piece do not bond
Power, and each embodiment diaphragm and pole piece have preferable cohesive force, diaphragm that can improve the consistent of the internal resistance of cell with the bonding of pole piece
Property, improve the service life of battery；Also, if diaphragm and pole piece are no preferably cohesive, there is gap between diaphragm and pole piece,
Can cause herein the internal resistance of cell it is larger, be easy to cause analysis lithium the problems such as, battery hardness improve, reduce battery be used for a long time process
In deformation.In addition, the absorbency of each embodiment of the application compares raising 20% or so with comparative example, further shorten chemical conversion
Technique improves the fast charging and discharging performance of battery.The thermal contraction performance and comparative example of each embodiment diaphragm of the application are suitable, ensure
The thermal contraction performance of embodiment diaphragm is with existing product identical.
The foregoing is a further detailed description of the present application in conjunction with specific implementation manners, and it cannot be said that this Shen
Specific implementation please is confined to these explanations.For those of ordinary skill in the art to which this application belongs, it is not taking off
Under the premise of conceiving from the application, a number of simple deductions or replacements can also be made.
Claims (10)
1. a kind of ceramic-coated separator, including basement membrane and the ceramic coating coated at least one surface of basement membrane, it is characterised in that：
The ceramic coating is coated with by the inorganic particle of surface grafting polyethylene glycol.
2. ceramic-coated separator according to claim 1, it is characterised in that：The ceramic-coated separator is in 180 degree angle
Peel strength be more than 40N/m.
3. ceramic-coated separator according to claim 1, it is characterised in that：The basement membrane is MIcroporous polyolefin film, preferably
, the MIcroporous polyolefin film is polyethene microporous membrane, microporous polypropylene membrane or polyethene microporous membrane and microporous polypropylene membrane
The two or more layers composite membrane of composition.
4. according to claim 1-3 any one of them ceramic-coated separators, it is characterised in that：The inorganic particle is selected from three oxygen
Change two aluminium, silica, zirconium dioxide, titanium dioxide, zinc oxide, magnesia, calcium carbonate, magnesium hydroxide, aluminium hydroxide, Bo Mu
At least one of stone.
5. according to claim 1-3 any one of them ceramic-coated separators, it is characterised in that：The thickness of basement membrane is 5-60 μm,
Porosity is 10%-60%, and aperture is 0.01-0.5 μm.
6. according to application of the claim 1-5 any one of them ceramic-coated separators in lithium ion battery.
7. a kind of lithium ion battery using claim 1-5 any one of them ceramic-coated separators.
8. according to the preparation method of claim 1-5 any one of them ceramic-coated separators, it is characterised in that：Including following step
Suddenly,
Amino silane is added by inorganic particle dispersion to ethyl alcohol in the step of preparing the inorganic particle of surface grafting polyethylene glycol
Coupling agent, at 20 DEG C -80 DEG C, pH value 6-8 is stirred to react 1-4h, and reaction product, which is washed the dry surface that obtains, carries amino
Inorganic particle；The inorganic particle of condensing agent, surface with amino, polyethylene glycol three of the end group with carboxyl are mixed, 20
DEG C -50 DEG C are stirred to react 1-8 hours, and then, washing obtains the inorganic particle of surface grafting polyethylene glycol；
The step of preparing coating slurry, by the inorganic particle dispersion to water of the surface grafting polyethylene glycol, stirs evenly, and makes
At coating slurry；
The step of preparing ceramic-coated separator：The coating slurry is coated on at least one surface of the basement membrane, obtains institute
State ceramic-coated separator.
9. preparation method according to claim 8, it is characterised in that：The condensing agent is 1- (3- dimethylamino-propyls)-
At least one in the chloro- 4,6- dimethoxys -1,3,5- triazines of 3- ethyl-carbodiimide hydrochlorides, 2- and N- hydroxysuccinimides
Kind；
Preferably, described the step of preparing ceramic-coated separator further includes that the coating slurry is coated on the basement membrane extremely
Behind a few surface, heating volatilization moisture content obtains the ceramic-coated separator；The temperature of the heating is 30-80 DEG C, and the time is
5-72s。
10. preparation method according to claim 8 or claim 9, it is characterised in that：The coating by blade rubbing method, Meyer
At least one of rod coating method, reverse roll coating method, intaglio plate roller coating method, dip-coating, brushing.
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| CN112362576A (en) * | 2020-07-21 | 2021-02-12 | 万向一二三股份公司 | Method for testing adhesive force of ceramic slurry |
| CN113248986A (en) * | 2021-06-16 | 2021-08-13 | 三能器具（无锡）有限公司 | Inorganic particle/polytetrafluoroethylene composite hydrophobic wear-resistant coating and preparation method thereof |
| CN113851787A (en) * | 2021-09-29 | 2021-12-28 | 中材锂膜有限公司 | Composite diaphragm, preparation method thereof and secondary battery |
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| CN113904058A (en) * | 2021-10-09 | 2022-01-07 | 远景动力技术(江苏)有限公司 | Diaphragm and preparation method and application thereof |
| CN115241603A (en) * | 2022-09-23 | 2022-10-25 | 宁德卓高新材料科技有限公司 | Heavy metal capturing diaphragm and preparation method and application thereof |
| CN116073073A (en) * | 2023-03-09 | 2023-05-05 | 合肥长阳新材料科技有限公司 | High-liquid-absorption lithium battery diaphragm and preparation method thereof |
| CN116073073B (en) * | 2023-03-09 | 2023-06-13 | 合肥长阳新材料科技有限公司 | High-liquid-absorption lithium battery diaphragm and preparation method thereof |
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