CN107706338A - A kind of lithium ion battery separator containing positive electrode and preparation method thereof - Google Patents
A kind of lithium ion battery separator containing positive electrode and preparation method thereof Download PDFInfo
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- CN107706338A CN107706338A CN201711195364.XA CN201711195364A CN107706338A CN 107706338 A CN107706338 A CN 107706338A CN 201711195364 A CN201711195364 A CN 201711195364A CN 107706338 A CN107706338 A CN 107706338A
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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
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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
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The present invention discloses a kind of lithium ion battery separator containing positive electrode, and the lithium ion battery separator is no less than one layer, and the composition of every layer of lithium ion battery separator is：Kynoar hexafluoropropene (PVDF HFP)：60wt% 98wt%, positive electrode：2wt% 40wt%.The present invention also provide it is a kind of this contain positive electrode lithium ion battery separator preparation method.The present invention promotes the formation of barrier film Hole, so as to improve the pick up of lithium ion battery separator and electrical conductivity, then reduces the internal driving of lithium battery by the way that positive electrode is added into lithium ion battery separator.By the way that PVDF HFP are added at twice, the cross-linked structure containing link can be formed, the structural strength of lithium ion battery separator after drying is effectively improved, while positive electrode particle limits the free movement of part PVDF HFP chains, further lifts the structural strength of lithium ion battery separator.
Description
Technical field
The present invention relates to lithium battery diaphragm technical field, more particularly to a kind of lithium ion battery separator containing positive electrode and
Its preparation method.
Background technology
In recent years, as the continuous development of new energy, the demand of lithium ion battery are also being continuously increased, battery is improved
Overall security and chemical property are the emphasis of current development lithium ion battery.Lithium ion battery separator is lithium ion battery
Important component, have impact on interfacial structure and internal driving, to the heat endurance of battery, cycle performance, high rate performance and
Security serves vital effect.Existing lithium battery diaphragm is obtained by polymer film pore-creating, and lithium ion can be with
Hole movement in lithium battery diaphragm, by lithium-ion membrane by adsorbing electrolyte in hole transmits lithium ion, if lithium
The electrolyte adsorbed of ion diaphragm is less, and it is larger to will result in inside lithium ion cell impedance.
Further, during lithium cell charging, lithium ion need from positive pole deviate from, by electrolyte reach lithium ion battery every
Film, through lithium ion battery separator after be inserted into the lattice of negative material, contact of the lithium ion battery separator with positive pole is inadequate
Closely, it is unfavorable for the transmission of lithium ion, lithium battery interior impedance is larger.
Phase inversion method is a kind of common method for preparing lithium ion battery separator, and its advantage is that technique is simple, and cost is cheap, into
There are higher pick up, good ionic conductivity after film, it is considered to be preferable membrane material；But shortcoming be mechanical strength,
Stability test and high rate performance etc. need to extract pore creating material not as conventional Celgard barrier films in preparation process, easily
Environmental pollution is caused, and is unfavorable for large-scale production.
Therefore, the prior art is defective, it is necessary to improve.
The content of the invention
The technical problem to be solved in the present invention is：There is provided a kind of containing the lithium ion battery separator of positive electrode and its preparation side
Method, strengthen the structural strength of lithium ion battery separator, reduce lithium battery interior impedance, reduction uses pore creating material, reduces pollution.
Technical scheme is as follows：A kind of lithium ion battery separator containing positive electrode, the lithium-ion electric are provided
Pond barrier film is no less than one layer, and the composition of every layer of lithium ion battery separator is：
Kynoar-hexafluoropropene (PVDF-HFP)：60wt%-98wt%, positive electrode：2wt%-40wt%.Will
Positive electrode is added into lithium ion battery separator, can be served as the medium of lithium battery anode and lithium battery diaphragm, be made lithium battery
Contact of the barrier film with lithium battery anode is more close, more conducively the transmission of lithium ion, greatly reduces internal battery impedance；Increase
Ionic conductivity, enhance the mechanical strength of barrier film.
Further, if the lithium ion battery separator is dried layer, if the positive electrode in dried layer lithium ion battery separator
Concentration be distributed by gradient, the positive electrode content of layer contact with positive electrode height, the positive pole of the layer contacted with negative material
Material content is low.The concentration of positive electrode gradient in lithium ion battery separator is distributed, and is ensureing the exhausted of lithium ion battery separator
Internal battery impedance is reduced while edge performance.
Further, the positive electrode be lithium ferric manganese phosphate, LiFePO4, cobalt acid lithium, LiMn2O4, nickle cobalt lithium manganate,
One kind in nickelic tertiary cathode material, the particle size range of the positive electrode are：5nm-5000nm.
The present invention also provides a kind of preparation method of the lithium ion battery separator containing positive electrode, comprises the following steps：
S1：PVDF-HFP and positive electrode are weighed by certain mass score ratio.
S2：The part PVDF-HFP powder weighed is added in the solvent of certain mass, and heating stirring, formed homogeneous
First colloidal solution.PVDF-HFP powder is dissolved completely in solvent in the step, forms a cross-linked structure.
S3：Remaining PVDF-HFP powder is added in the solvent of certain mass, stirring at normal temperature uniformly adds step S2 afterwards
Stirred in first mucilage binding solution of middle formation, form the second homogeneous colloidal solution.PVDF-HFP powder in the step is normal
It is not dissolved completely in temperature stirring in solvent, it forms the second colloidal solution after being mixed evenly with the first colloidal solution,
Second colloidal solution is the cross-linked structure containing link, and the PVDF-HFP being completely dissolved in step S2 is gluey second
Main cross-linked structure is served as in solution, the PVDF-HFP not being completely dissolved in this step is served as in the second colloidal solution
Link.
S4：Positive electrode is added in a certain amount of solvent, stirring at normal temperature uniformly adds the second glue that step S3 is formed afterwards
In shape solution, continue to stir, obtain the 3rd homogeneous gluey glue.Positive electrode is first added in solvent, added to second
In colloidal solution, be advantageous to positive electrode and disperse in the second colloidal liquid, obtain the 3rd homogeneous colloidal solution.In the 3rd glue
In shape solution, positive electrode is evenly distributed in the cross-linked structure containing link, the PVDF- being completely dissolved in step S2
HFP serves as main cross-linked structure in the 3rd colloidal solution, in step S3 in the PVDF-HFP that is not completely dissolved
Link is served as in three colloidal solutions.
S5：The 3rd homogeneous colloidal solution that step S4 is obtained is coated with coating machine, after drying, obtains PVDF-HFP/
Positive electrode lithium ion battery barrier film.3rd colloidal solution of coating is dried, solvent volatilization pore-creating, is obtaining PVDF-HFP/ just
Pole material lithium ion battery barrier film, formed by the 3rd colloidal solution contains the PVDF-HFP not being completely dissolved in step S3
Link so that resulting PVDF-HFP/ positive electrodes lithium ion battery membrane configuration is more firm；PVDF-HFP strand phases
Positive electrode particle can be wrapped in wherein by the tridimensional network being mutually wound, and positive electrode particle limits part
The free movement of PVDF-HFP chains further improves the structural strength of barrier film.Positive electrode can reduce PVDF-HFP crystallization
Degree, the ratio of amorphous phase is improved, be advantageous to the hole formation of lithium ion battery separator, and the reunion of positive electrode makes more
Hole formation, so as to absorb more electrolyte, improve PVDF-HFP/ positive electrode lithium ion battery barrier film imbibitions
Rate and electrical conductivity；Further, positive electrode is added into lithium ion battery separator, can serve as lithium battery anode and lithium ion
The medium of battery diaphragm, make contact of the lithium ion battery separator with lithium battery anode more close, the more conducively transmission of lithium ion,
The ionic conductivity of lithium ion battery separator is increased, greatly reduces internal battery impedance；And the superficial layer of positive electrode
Defect is more, the passage that can be transmitted as ion, it is allowed to which ion is with relatively low migration activation energy by so as to improve lithium-ion electric
The electrical conductivity of the ion of pond barrier film, further reduce the impedance of inside battery.
Further, the preparation method of a kind of lithium ion battery separator containing positive electrode, is additionally included in step S5
S6 afterwards：It is other mass fractions that coated positive pole material is applied on resulting PVDF-HFP/ positive electrode lithium ion battery barrier films
PVDF-HFP/ positive electrode glues, dry after, obtain positive electrode for gradient distribution PVDF-HFP/ anode material of lithium from
Sub- battery diaphragm.
Further, the thickness of the PVDF-HFP/ positive electrodes lithium ion battery barrier film is 5 μm -50 μm.
Further, in step s 2, the scope of the mass ratio of PVDF-HFP and solvent is：0.05-0.25, the temperature of heating
Spending scope is：45 DEG C -55 DEG C, the range of viscosities of the first colloidal solution is：1000cp-5000cp.
Further, in step s3, the scope of the mass ratio of PVDF-HFP and solvent is：0.05-0.2, the temperature of stirring
Spending scope is：20 DEG C -40 DEG C, the range of viscosities of second colloidal solution is：1000cp-4000cp.
Further, in step s 4, the scope of the mass ratio of positive electrode and solvent is：0.06-0.8, the temperature of stirring
Spending scope is：20 DEG C -40 DEG C, the 3rd colloidal solution range of viscosities is 1200cp-4000cp.
Further, the scope of the mass ratio that adds PVDF-HFP is added in PVDF-HFP and step S3 in step s 2
For：1.5-8.
Further, the solvent is acetone, DMF, one kind in DMA or extremely
Few two kinds mixture.
Preferably, the solvent is acetone.
Using such scheme, the present invention provides a kind of lithium ion battery separator containing positive electrode and preparation method thereof, by
PVDF-HFP crystallinity can be reduced in positive electrode, improves the ratio of amorphous phase, is advantageous to hole formation, and positive pole
The reunion of material makes more hole formations, so as to absorb more electrolyte, improves PVDF-HFP/ anode material of lithium
Ion battery barrier film pick up and electrical conductivity, reduce the impedance of inside battery；PVDF-HFP/ positive electrode lithium ion batteries simultaneously
Positive electrode in barrier film can serve as the medium of lithium battery anode and lithium battery diaphragm, make lithium battery diaphragm and lithium battery anode
Contact it is more close, the more conducively transmission of lithium ion, increase the ionic conductivity of lithium ion battery separator, greatly reduce
Internal battery impedance；, can be as the passage of ion transmission, it is allowed to which ion is with relatively low and the surface layer defect of positive electrode is more
Migration activation energy by, so as to improve the electrical conductivity of the ion of lithium ion battery separator, further reduce inside battery resistance
It is anti-；By the way that PVDF-HFP is added at twice, the cross-linked structure containing link can be formed, effectively improves lithium after drying
The structural strength of ion battery barrier film, while positive electrode particle limits the free movement of part PVDF-HFP chains, further
Lift the structural strength of lithium ion battery separator.
Brief description of the drawings
Fig. 1 is the flow chart of the inventive method；
Fig. 2 is barrier film, PVDF-HFP barrier films, the ESEM pair of the barrier films of Celgard 2400 of a certain embodiment of the present invention
Than figure；
Fig. 3 is that barrier film, PVDF-HFP barrier films, the barrier films of Celgard 2400 of a certain embodiment of the present invention are assembled into battery
Cycle performance of battery comparison diagram；
Fig. 4 is that barrier film, PVDF-HFP barrier films, the barrier films of Celgard 2400 of a certain embodiment of the present invention are assembled into battery
High rate performance comparison diagram；
Fig. 5 is the barrier film, PVDF-HFP barrier films, the barrier films of Celgard 2400 of a certain embodiment of the present invention after high-temperature process
It is assembled into the cycle performance of battery comparison diagram of battery；
Fig. 6 is barrier film, PVDF-HFP barrier films, the XRD comparison diagrams of lithium ferric manganese phosphate of a certain embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
The present invention provides a kind of lithium ion battery separator containing positive electrode, and the lithium ion battery separator is one layer, should
Layer lithium ion battery separator composition be：
Kynoar-hexafluoropropene (PVDF-HFP)：94wt%, lithium ferric manganese phosphate (LMFP)：6wt%.
The particle size range of the lithium ferric manganese phosphate is 50nm-300nm.
Referring to Fig. 1, the present invention also provides a kind of preparation method of the lithium ion battery separator of phosphoric acid ferrimanganic lithium, including
Following steps：
S1：PVDF-HFP and lithium ferric manganese phosphate are weighed by above-mentioned mass fraction ratio.
S2：The 87.5wt%PVDF-HFP powder weighed is added in the acetone of certain mass, and heating stirring, formed equal
One the first colloidal solution.The mass ratio of PVDF-HFP and solvent in the step is：0.2, the temperature range of heating is：55
DEG C, the range of viscosities of the colloidal solution of gained first is：4000cp.
S3：Remaining PVDF-HFP powder is added in the acetone of certain mass, stirring at normal temperature uniformly adds step S2 afterwards
Stirred in first mucilage binding solution of middle formation, form the second homogeneous colloidal solution.In this step, PVDF-HFP and acetone
Mass ratio is：0.2, the temperature of stirring is：40 DEG C, the range of viscosities of second colloidal solution is：3000cp.
S4：Lithium ferric manganese phosphate is added in a certain amount of solvent, stirring at normal temperature uniformly adds second that step S3 is formed afterwards
In colloidal solution, continue to stir, obtain the 3rd homogeneous gluey glue.The mass ratio of lithium ferric manganese phosphate and solvent is：0.06, stir
The temperature range mixed is：40 DEG C, the 3rd colloidal solution viscosity is 2400cp.
S5：The 3rd homogeneous colloidal solution that step S4 is obtained is coated with coating machine, after drying, obtains PVDF-HFP/
Lithium ferric manganese phosphate lithium ion battery separator.
The thickness of the PVDF-HFP/ positive electrodes lithium ion battery barrier film is 20 μm.
Embodiment 2
The present invention provides a kind of lithium ion battery separator containing positive electrode, and the lithium ion battery separator is one layer, should
Layer lithium ion battery separator composition be：
Kynoar-hexafluoropropene (PVDF-HFP)：83wt%, lithium ferric manganese phosphate：17wt%.
The particle size range of the lithium ferric manganese phosphate is：50nm-300nm.
Referring to Fig. 1, the present invention also provides a kind of preparation method of the lithium ion battery separator of phosphoric acid ferrimanganic lithium, including
Following steps：
S1：PVDF-HFP and lithium ferric manganese phosphate are weighed by above-mentioned mass fraction ratio.
S2：The 87.5wt%PVDF-HFP powder weighed is added in the acetone of certain mass, and heating stirring, formed equal
One the first colloidal solution.The mass ratio of PVDF-HFP and solvent in the step is：0.2, the temperature range of heating is：55
DEG C, the range of viscosities of the colloidal solution of gained first is：3000cp.
S3：Remaining PVDF-HFP powder is added in the acetone of certain mass, stirring at normal temperature uniformly adds step S2 afterwards
Stirred in first mucilage binding solution of middle formation, form the second homogeneous colloidal solution.In this step, PVDF-HFP and acetone
Mass ratio is：0.2, the temperature of stirring is：40 DEG C, the range of viscosities of second colloidal solution is：2500cp.
S4：Lithium ferric manganese phosphate is added in a certain amount of solvent, stirring at normal temperature uniformly adds second that step S3 is formed afterwards
In colloidal solution, continue to stir, obtain the 3rd homogeneous gluey glue.The mass ratio of lithium ferric manganese phosphate and solvent is：0.06, stir
The temperature range mixed is：40 DEG C, the 3rd colloidal solution viscosity is 2000cp.
S5：The 3rd homogeneous colloidal solution that step S4 is obtained is coated with coating machine, after drying, obtains PVDF-HFP/
Lithium ferric manganese phosphate lithium ion battery separator.
The thickness of the PVDF-HFP/ positive electrodes lithium ion battery barrier film is 15 μm.
Embodiment 3
The present invention provides a kind of lithium ion battery separator containing positive electrode, and the lithium ion battery separator is one layer, should
Layer lithium ion battery separator composition be：
Kynoar-hexafluoropropene (PVDF-HFP)：60wt%, lithium ferric manganese phosphate：40wt%.
The particle size range of the lithium ferric manganese phosphate is：50nm-300nm.
Referring to Fig. 1, the present invention also provides a kind of preparation method of the lithium ion battery separator of phosphoric acid ferrimanganic lithium, including
Following steps：
S1：PVDF-HFP and lithium ferric manganese phosphate are weighed by above-mentioned mass fraction ratio.
S2：The 87.5wt%PVDF-HFP powder weighed is added in the acetone of certain mass, and heating stirring, formed equal
One the first colloidal solution.The mass ratio of PVDF-HFP and solvent in the step is：0.2, the temperature range of heating is：55
DEG C, the range of viscosities of the colloidal solution of gained first is：1500cp.
S3：Remaining PVDF-HFP powder is added in the acetone of certain mass, stirring at normal temperature uniformly adds step S2 afterwards
Stirred in first mucilage binding solution of middle formation, form the second homogeneous colloidal solution.In this step, PVDF-HFP and acetone
Mass ratio is：0.2, the temperature of stirring is：40 DEG C, the range of viscosities of second colloidal solution is：1400cp.
S4：Lithium ferric manganese phosphate is added in a certain amount of solvent, stirring at normal temperature uniformly adds second that step S3 is formed afterwards
In colloidal solution, continue to stir, obtain the 3rd homogeneous gluey glue.The mass ratio of lithium ferric manganese phosphate and solvent is：0.06, stir
The temperature range mixed is：40 DEG C, the 3rd colloidal solution viscosity is 1200cp.
S5：The 3rd homogeneous colloidal solution that step S4 is obtained is coated with coating machine, after drying, obtains PVDF-HFP/
Lithium ferric manganese phosphate lithium ion battery separator.
The thickness of the PVDF-HFP/ positive electrodes lithium ion battery barrier film is 30 μm.
Embodiment 4
Obtained in the PVDF-HFP/ positive electrode lithium ion batteries membrane surface coating embodiment 1 obtained by embodiment 3
The 3rd colloidal solution obtained, after drying, obtain the PVDF-HFP/ positive electrode lithium ion batteries that lithium ferric manganese phosphate is gradient distribution
Barrier film.
Referring to Fig. 2, (a), (b), (c) in Fig. 2 be respectively the barrier films of Celgard 2400, simple PVDF-HFP lithiums from
The scanning electron microscope (SEM) photograph of sub- battery diaphragm and the gained PVDF-HFP/LMFP lithium ion battery separators of embodiment 2.Tied from the surface of barrier film
After structure can be seen that addition LMFP materials, diaphragm micro-hole increases, and is advantageous to improve the pick up and electrical conductivity of barrier film, is advantageous to
The transmission of lithium ion, so as to improve battery performance.
Referring to Fig. 3, Fig. 3 is using LMFP/C as positive pole, lithium piece assembles button as negative pole, different types of barrier film
The cycle performance of battery that battery is showed in 0.1C, the assembling of the gained PVDF-HFP/LMFP lithium ion battery separators of embodiment 2
The cycle performance of battery of battery is than the battery by Celgard2400 barrier films and the assembling of simple PVDF-HFP lithium ion battery separators
Cycle performance of battery it is good.
Referring to Fig. 4, Fig. 4 is using LMFP/C as positive pole, lithium piece assembles button as negative pole, different types of barrier film
The high rate performance of battery, the gained PVDF-HFP/LMFP lithium ion battery separators of embodiment 2 assembling battery high rate performance ratio by
The good rate capability of the barrier films of Celgard 2400 and the battery of simple PVDF-HFP lithium ion battery separators assembling.
Referring to Fig. 5, Fig. 5 is the barrier films of Celgard 2400, PVDF-HFP lithium ion battery separators and the gained lithium of embodiment 2
Cycle performance of battery of the ion battery barrier film when calcining the battery assembled under the same conditions after 2h in 0.5C for 140 DEG C, implements
The gained PVDF-HFP/LMFP lithium ion battery separators of example 2 assembling battery cycle performance of battery ratio by Celgard 2400 every
The cycle performance of battery of film and the battery of simple PVDF-HFP lithium ion battery separators assembling is good.
Referring to Fig. 6, Fig. 6 is the gained PVDF-HFP/LMFP lithium ion battery separators of embodiment 2, PVDF-HFP lithium ions
The XRD of battery diaphragm, LMFP, it can be seen that the LMFP drops added in PVDF-HFP/LMFP lithium ion battery separators
Low PVDF-HFP crystallization, improves the ratio of amorphous phase, is advantageous to hole formation.
In summary, the present invention provides a kind of lithium ion battery separator containing positive electrode and preparation method thereof, due to just
Pole material can reduce PVDF-HFP crystallinity, improve the ratio of amorphous phase, be advantageous to hole formation, and positive electrode
Reunion make more hole formations, so as to absorb more electrolyte, improve PVDF-HFP/ positive electrode lithium ions
Liquid absorption rate of battery diaphragm and electrical conductivity, reduce the impedance of inside battery；PVDF-HFP/ positive electrode lithium ion battery barrier films simultaneously
In positive electrode can serve as the medium of lithium battery anode and lithium battery diaphragm, make connecing for lithium battery diaphragm and lithium battery anode
It is tactile more close, the more conducively transmission of lithium ion, the ionic conductivity of lithium ion battery separator is increased, greatly reduces battery
Internal driving；, can be as the passage of ion transmission, it is allowed to which ion is moved with relatively low and the surface layer defect of positive electrode is more
Activation energy is moved by so as to improve the electrical conductivity of the ion of lithium ion battery separator, further reducing the impedance of inside battery；It is logical
Cross and add PVDF-HFP at twice, the cross-linked structure containing link can be formed, effectively improve lithium ion after drying
The structural strength of battery diaphragm, while positive electrode particle limits the free movement of part PVDF-HFP chains, further lifting
The structural strength of lithium ion battery separator.
These are only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made within principle etc., should be included in the scope of the protection.
Claims (10)
- A kind of 1. lithium ion battery separator containing positive electrode, it is characterised in that the lithium ion battery separator is no less than one layer, The composition of every layer of lithium ion battery separator is：Kynoar-hexafluoropropene (PVDF-HFP)：60wt%-98wt%,Positive electrode：2wt%-40wt%.
- A kind of 2. lithium ion battery separator containing positive electrode according to claim 1, it is characterised in that the lithium ion If battery diaphragm is dried layer, if the concentration of the positive electrode in dried layer lithium ion battery separator is distributed by gradient, with positive electrode The positive electrode content of the layer of contact is high, and the positive electrode content of the layer contacted with negative material is low.
- A kind of 3. lithium ion battery separator containing positive electrode according to claim 1, it is characterised in that the positive pole material Expect for one kind in lithium ferric manganese phosphate, LiFePO4, cobalt acid lithium, LiMn2O4, nickle cobalt lithium manganate, nickelic tertiary cathode material, institute The particle size range for stating positive electrode is 5nm-5000nm.
- 4. a kind of preparation method of the lithium ion battery separator containing positive electrode, it is characterised in that comprise the following steps：S1：PVDF-HFP and positive electrode are weighed by certain mass score ratio；S2：The part PVDF-HFP powder weighed is added in the solvent of certain mass, and heating stirring, form homogeneous first Colloidal solution；S3：Remaining PVDF-HFP powder is added in the solvent of certain mass, stirring at normal temperature uniformly adds step S2 and formed afterwards The first mucilage binding solution in stir, form the second homogeneous colloidal solution；S4：Positive electrode is added in a certain amount of solvent, it is molten that stirring at normal temperature uniformly adds the second glue that step S3 is formed afterwards In liquid, continue to stir, obtain the 3rd homogeneous gluey glue；S5：The 3rd homogeneous colloidal solution that step S4 is obtained is coated with coating machine, after drying, obtains PVDF-HFP/ positive poles Material lithium ion battery barrier film.
- A kind of 5. preparation method of lithium ion battery separator containing positive electrode according to claim 4, it is characterised in that The S6 being additionally included in after step S5：Coated positive pole material is applied on resulting PVDF-HFP/ positive electrode lithium ion battery barrier films For the PVDF-HFP/ positive electrode glues of other mass fractions, after drying, the PVDF- that positive electrode is gradient distribution is obtained HFP/ positive electrode lithium ion battery barrier films.
- 6. a kind of preparation method of lithium ion battery separator containing positive electrode according to claim 4 or 5, its feature exist In the thickness of the PVDF-HFP/ positive electrodes lithium ion battery barrier film is 5 μm -50 μm.
- A kind of 7. preparation method of lithium ion battery separator containing positive electrode according to claim 4, it is characterised in that In step s 2, the scope of the mass ratio of PVDF-HFP and solvent is：0.05-0.25, the temperature range of heating are：45℃-55 DEG C, the range of viscosities of the first colloidal solution is：1000cp-5000cp；In step s3, the scope of the mass ratio of PVDF-HFP and solvent is：0.05-0.2, the temperature range of stirring are：20℃- 40 DEG C, the range of viscosities of second colloidal solution is：1000cp-4000cp；In step s 4, the scope of the mass ratio of positive electrode and solvent is：0.06-0.8, the temperature range of stirring are：20℃- 40 DEG C, the 3rd colloidal solution range of viscosities is 1200cp-4000cp.
- A kind of 8. preparation method of lithium ion battery separator containing positive electrode according to claim 4, it is characterised in that The scope of mass ratio for adding PVDF-HFP and addition PVDF-HFP in step S3 in step s 2 is：1.5-8.
- A kind of 9. preparation method of lithium ion battery separator containing positive electrode according to claim 4, it is characterised in that The solvent is acetone, N,N-dimethylformamide, one kind in DMAC N,N' dimethyl acetamide or at least two mixture.
- 10. a kind of preparation method of lithium ion battery separator containing positive electrode according to claim 9, its feature exist In the solvent is acetone.
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| CN109728228A (en) * | 2018-12-11 | 2019-05-07 | 溧阳天目先导电池材料科技有限公司 | A kind of film and preparation method thereof and secondary cell |
| CN109817865A (en) * | 2018-12-19 | 2019-05-28 | 长沙新材料产业研究院有限公司 | A kind of composite diaphragm and preparation method thereof |
| WO2020151357A1 (en) * | 2019-01-25 | 2020-07-30 | 深圳锂硫科技有限公司 | Lithium battery separator and preparation method therefor |
| CN113328207A (en) * | 2021-06-02 | 2021-08-31 | 电子科技大学 | Lithium ion battery composite diaphragm and preparation method thereof |
| CN114335883A (en) * | 2021-12-06 | 2022-04-12 | 河北金力新能源科技股份有限公司 | Lithium ion battery diaphragm with high heat exchange stability and preparation method thereof |
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| WO2020151357A1 (en) * | 2019-01-25 | 2020-07-30 | 深圳锂硫科技有限公司 | Lithium battery separator and preparation method therefor |
| CN113328207A (en) * | 2021-06-02 | 2021-08-31 | 电子科技大学 | Lithium ion battery composite diaphragm and preparation method thereof |
| CN114335883A (en) * | 2021-12-06 | 2022-04-12 | 河北金力新能源科技股份有限公司 | Lithium ion battery diaphragm with high heat exchange stability and preparation method thereof |
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