CN206210903U - A kind of battery diaphragm and the lithium rechargeable battery including it - Google Patents
A kind of battery diaphragm and the lithium rechargeable battery including it Download PDFInfo
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- CN206210903U CN206210903U CN201620970667.9U CN201620970667U CN206210903U CN 206210903 U CN206210903 U CN 206210903U CN 201620970667 U CN201620970667 U CN 201620970667U CN 206210903 U CN206210903 U CN 206210903U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model is related to field of lithium ion secondary, discloses a kind of battery diaphragm and the lithium rechargeable battery including it.Wherein described battery diaphragm includes porous basement membrane, the porous basement membrane includes the first surface and second surface that are oppositely arranged, and the battery diaphragm is additionally included in the first ceramic layer, the first porous heat-resistant layer and the first tack coat set gradually from the inside to the outside on the first surface of the porous basement membrane.The utility model battery diaphragm is conducive to improving the combination property of the battery diaphragm by the first ceramic layer, the first porous heat-resistant layer and the first tack coat that are set gradually from the inside to the outside on the first surface of porous basement membrane.
Description
Technical field
The utility model is related to field of lithium ion secondary, in particular it relates to a kind of battery diaphragm and the lithium including it
Ion secondary battery.
Background technology
Lithium rechargeable battery is main by positive/negative material, electrolyte, battery diaphragm and battery case packaging material group
Into.Wherein battery diaphragm is the important component of lithium ion battery, not only needs to play separation positive and negative electrode, to prevent battery
Internal short-circuit, and also need to allow electrolyte ion to pass freely through, to complete the effect of charge discharge process.Barrier film
Performance determines the interfacial structure of battery, internal resistance etc., directly affects high rate performance, cycle performance and the security performance of battery
Characteristics such as (resistances to elevated temperatures), the barrier film of excellent performance has important effect to the combination property for improving battery, is claimed by industry
It is " the 3rd electrode " of battery.
With the extensive use of lithium rechargeable battery, research staff is also more and more deeper for the research and development of lithium ion battery
Enter, the combination property for the battery diaphragm used in it requires also more and more higher, and it is preferable to provide a kind of combination property
Battery diaphragm has become the another important topic of current research staff.
Utility model content
The purpose of this utility model is to provide a kind of battery diaphragm and the lithium rechargeable battery including it, described to optimize
The combination property of battery.
To achieve these goals, the utility model provides a kind of battery diaphragm, and the battery diaphragm includes porous basement membrane, institute
Stating porous basement membrane includes the first surface and second surface that are oppositely arranged, and the battery diaphragm is additionally included in the porous basement membrane
The first ceramic layer, the first porous heat-resistant layer and the first tack coat set gradually from the inside to the outside on first surface.
Preferably, first porous heat-resistant layer is the fibrage with network of fibers shape structure；In the fibrage
Fibre diameter be 100~2000nm, the porosity of the fibrage is 75%~93%.
Preferably, the thickness of the battery diaphragm is 5-50 μm, the thickness of the porous basement membrane is 5-30 μm, described the
The thickness of one ceramic layer is 0.5-10 μm, and the thickness of first porous heat-resistant layer is 0.5-20 μm, first tack coat
Thickness is 0.1-10 μm.
Preferably, the battery diaphragm has a four-layer structure, and the described porous basement membrane, described by being cascading
First ceramic layer, first porous heat-resistant layer and first tack coat composition.
Preferably, the thickness of the battery diaphragm is 8-23 μm, the thickness of the porous basement membrane is 5-12 μm, described the
The thickness of one ceramic layer is 1-5 μm, and the thickness of first porous heat-resistant layer is 1-5 μm, and the thickness of first tack coat is
0.1-3μm。
Preferably, the battery diaphragm is additionally included on the second surface of the porous basement membrane setting gradually from the inside to the outside
The second optional ceramic layer, the second optional porous heat-resistant layer and the second optional tack coat at least one.
Preferably, the thickness of optional second ceramic layer is 0-10 μm, optional second porous heat-resistant layer
Thickness be 0-20 μm, the thickness of optional second tack coat is 0-10 μm.
Preferably, being provided with following structure sheaf on the second surface of the porous basement membrane：Set gradually from the inside to the outside
The second ceramic layer and the second porous heat-resistant layer；Or the second ceramic layer and the second tack coat for setting gradually from the inside to the outside；Or
The second porous heat-resistant layer and the second tack coat that person sets gradually from the inside to the outside；Or the second ceramics for setting gradually from the inside to the outside
Layer, the second porous heat-resistant layer and the second tack coat.
Preferably, the battery diaphragm has six layer structure, bonded by be cascading in order described second
Layer, second ceramic layer, the porous basement membrane, first ceramic layer, first porous heat-resistant layer and described first
Tack coat is constituted.
Preferably, the thickness of the battery diaphragm is 10-30 μm, the thickness of the porous basement membrane is 5-20 μm, described
The thickness of the first ceramic layer is 1-5 μm, and the thickness of second ceramic layer is 1-5 μm, the thickness of first porous heat-resistant layer
It it is 1-5 μm, the thickness of first tack coat is 0.1-3 μm, the thickness of second tack coat is 0.1-3 μm.
Preferably, the battery diaphragm has seven-layer structure, bonded by be cascading in order described second
It is layer, second porous heat-resistant layer, second ceramic layer, the porous basement membrane, first ceramic layer, described first porous
Refractory layer and first tack coat are constituted.
Preferably, the thickness of the battery diaphragm is 10-30 μm, the thickness of the porous basement membrane is 5-20 μm, described
The thickness of the first ceramic layer is 1-5 μm, and the thickness of second ceramic layer is 1-5 μm, the thickness of first porous heat-resistant layer
It is 1-5 μm, the thickness of second porous heat-resistant layer is 1-5 μm, the thickness of first tack coat is 0.1-3 μm, described the
The thickness of two tack coats is 0.1-3 μm.
Preferably, also including being arranged on first porous heat-resistant layer with first tack coat in the battery diaphragm
Between the 3rd ceramic layer.
Preferably, the battery diaphragm includes second porous heat-resistant layer and second tack coat, and it is described
Also include the 4th ceramic layer being arranged between second porous heat-resistant layer and second tack coat in battery diaphragm.
Meanwhile, a kind of lithium rechargeable battery is additionally provided in the utility model, the lithium rechargeable battery is included just
Pole, negative pole, and the barrier film being placed between the positive pole and the negative pole, the barrier film are the above-mentioned battery diaphragm of the utility model.
By a kind of battery diaphragm of above-mentioned technical proposal and the lithium rechargeable battery including it, with following beneficial effect
Really：
(1) by setting ceramic layer, be conducive to improving the wellability between the battery diaphragm and electrolyte, and then be conducive to
Improve the chemical property of prepared battery；
(2) by setting porous heat-resistant layer, be conducive to improving the resistance to elevated temperatures of the battery diaphragm, and then be conducive to improving
The high temperature safety of prepared battery；
(3) by setting tack coat, be conducive to improving the compatibility between the battery diaphragm and positive/negative so that battery
What is combined between barrier film and positive/negative is more firm, and then is conducive to the chemical property and mechanics of the battery prepared by improvement
Performance；
(4) it is described by the way that first ceramic layer, the first porous heat-resistant layer and the first tack coat be arranged in order
On the surface of porous septum, be conducive to promoting layers of material while each self-applying is realized, using in ceramic layer and tack coat
The characteristics of all containing binding agent, strengthen this four-layer structure adhesion each other, so be conducive to obtaining structure it is more firm,
And the battery diaphragm that combination property is improved.
Other features and advantages of the utility model will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is further understood to of the present utility model for providing, and constitutes a part for specification, and following
Specific embodiment be used to explain the utility model together, but do not constitute to limitation of the present utility model.In the accompanying drawings：
Fig. 1 shows the decomposition texture schematic diagram according to battery diaphragm in a kind of implementation method of the utility model；
Fig. 2 shows the decomposition texture schematic diagram according to battery diaphragm in the utility model another embodiment；
Fig. 3 shows the decomposition texture schematic diagram according to battery diaphragm in the utility model another embodiment.
Description of reference numerals
The ceramic layer of 10 porous basement membrane 21 first
The porous heat-resistant layer of 22 second ceramic layer 31 first
The tack coat of 32 second porous heat-resistant layer 41 first
42 second tack coats
Specific embodiment
Specific embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.It should be appreciated that herein
Described specific embodiment is merely to illustrate and explains the utility model, is not limited to the utility model.
A kind of battery diaphragm is provided in the utility model.As shown in figure 1, the battery diaphragm includes porous basement membrane 10,
The porous basement membrane includes the first surface and second surface that are oppositely arranged, and the battery diaphragm is additionally included in the porous basement membrane
First surface on the first ceramic layer 21, the first porous heat-resistant layer 31 and the first tack coat 41 that set gradually from the inside to the outside.
Above-mentioned battery diaphragm provided by the utility model is conducive to improving the battery diaphragm with electricity by setting ceramic layer
Solution liquid between wellability, and then be conducive to improve prepared by battery chemical property；By setting porous heat-resistant layer, have
Beneficial to improve the battery diaphragm resistance to elevated temperatures, and then be conducive to improve prepared by battery high temperature safety；By setting
Tack coat is put, is conducive to improving the compatibility between the battery diaphragm and positive/negative so that between battery diaphragm and positive/negative
With reference to it is more firm, and then be conducive to improve prepared by battery chemical property and mechanical property；By by described
One ceramic layer, the first porous heat-resistant layer and the first tack coat are arranged on the surface of the porous septum in order, are conducive to
Promote layers of material while each self-applying is realized, the characteristics of using all binding agent is contained in ceramic layer and tack coat, enhancing
This four-layer structure adhesion each other, and then be conducive to obtaining the electricity that structure is more firm and combination property is improved
Pond barrier film.
According to the above-mentioned battery diaphragm of the utility model, wherein first porous heat-resistant layer is with network of fibers shape structure
Fibrage；Fibre diameter in the fibrage is 100~2000nm, and the porosity of the fibrage is 75%~93%.
Be conducive to further improving the lithium of battery diaphragm as porous heat-resistant layer by forming the fibrage with network of fibers shape structure
Ionic conductivity.
According to the above-mentioned battery diaphragm of the utility model, the barrier film that the selection that it can be according to requirements appropriate is used is thick
Degree.The thickness of such as described battery diaphragm is 5-50 μm, and the thickness of the porous basement membrane 10 is 5-30 μm, first ceramic layer
21 thickness is 0.5-10 μm, and the thickness of first porous heat-resistant layer 31 is 0.5-20 μm, the thickness of first tack coat 41
Spend is 0.1-10 μm.
According to above-mentioned battery diaphragm, under preferable case, the battery diaphragm has four-layer structure, as shown in figure 1, the battery
Barrier film by be cascading described porous basement membrane 10, first ceramic layer 21, first porous heat-resistant layer 31 and
First tack coat 41 is constituted.Not only structure is relatively easy for this battery diaphragm with four-layer structure, reduces technique difficult
Degree, and by each Rotating fields of Proper Match, is conducive to reducing the taking up room of the battery diaphragm, improving battery overall space
While utilization rate, optimize the combination property of the battery diaphragm.
According to above-mentioned battery diaphragm, when the battery diaphragm has four-layer structure, the battery diaphragm under preferable case
Thickness is 8-23 μm, and the thickness of the porous basement membrane 10 is 5-12 μm, and the thickness of first ceramic layer 21 is 1-5 μm, described
The thickness of the first porous heat-resistant layer 31 is 1-5 μm, and the thickness of first tack coat 41 is 0.1-3 μm.
According to above-mentioned battery diaphragm, under preferable case, the battery diaphragm is additionally included in the second of the porous basement membrane 10
The second optional ceramic layer 22, optional the second porous heat-resistant layer 32 and optional second set gradually from the inside to the outside on surface
At least one in tack coat 42.Wherein, the thickness of the second optional ceramic layer 22 is -0-10 μm, and optional described second is resistance to
The thickness of thermosphere 32 is 0-20 μm, and the thickness of optional second tack coat 42 is 0-10 μm.
According to above-mentioned battery diaphragm, under preferable case, set on the second surface of the porous basement membrane 10 and set gradually
There is following structure sheaf：The second ceramic layer 22 for setting gradually from the inside to the outside and the second porous heat-resistant layer 32；Or from the inside to the outside according to
Second ceramic layer 22 and the second tack coat 42 of secondary setting；Or the second porous heat-resistant layer 32 and for setting gradually from the inside to the outside
Two tack coats 42；Or the second ceramic layer 22, the second porous heat-resistant layer 32 and the second tack coat for setting gradually from the inside to the outside
42。
According to above-mentioned battery diaphragm, under preferable case, as shown in Fig. 2 the battery diaphragm has six layer structure, by by suitable
Second tack coat 42, second ceramic layer 22, the porous basement membrane 10, first ceramics that sequence is cascading
Layer 21, first porous heat-resistant layer 31 and first tack coat 41 are constituted.This battery diaphragm with six layer structure
In simultaneously include the first tack coat and the second tack coat, with the positive/negative with battery simultaneously be combined, be conducive to further it is excellent
Change the chemical property and mechanical property of prepared battery.
According to above-mentioned battery diaphragm, when the battery diaphragm has six layer structure, the thickness of the preferably battery diaphragm is
10-30 μm, the thickness of the porous basement membrane 10 is 5-20m, and the thickness of first ceramic layer 21 is 1-5 μm, second pottery
The thickness of enamel coating 22 is 1-5 μm；The thickness of first porous heat-resistant layer 31 is 1-5 μm, the thickness of first tack coat 41
It it is 0.1-3 μm, the thickness of second tack coat 42 is 0.1-3 μm.
According to above-mentioned battery diaphragm, under preferable case, as shown in figure 3, the battery diaphragm has seven-layer structure, by by suitable
It is second tack coat 42 that sequence is cascading, second porous heat-resistant layer 32, second ceramic layer 22, described many
Hole basement membrane 10, first ceramic layer 21, first porous heat-resistant layer 31 and first tack coat 41 are constituted.
According to above-mentioned battery diaphragm, when the battery diaphragm has seven-layer structure, the thickness of preferred battery barrier film is 5-
30 μm, the thickness of the porous basement membrane 10 is 5-20 μm, and the thickness of first ceramic layer 21 is 1-5 μm, second ceramics
The thickness of layer 22 is 1-5 μm；The thickness of first porous heat-resistant layer 31 is 1-5 μm, the thickness of second porous heat-resistant layer 32
Spend is 1-5 μm；The thickness of first tack coat 41 is 0.1-3 μm, and the thickness of second tack coat 42 is 0.1-3 μm.
According to above-mentioned battery diaphragm, under preferable case, the battery diaphragm also includes being arranged on first porous heat-resistant
The 3rd ceramic layer between layer 31 and first tack coat 41.By set the 3rd ceramic layer, can be formed the first ceramic layer/
The sandwich of the first porous heat-resistant layer/the 3rd ceramic layer, using ceramic layer to the reinforcement effect of porous heat-resistant layer, further carries
The resistance to elevated temperatures of battery diaphragm high, the supporting role using porous heat-resistant layer to ceramic layer further improves battery diaphragm
Toughness and intensity.Under preferable case, the battery diaphragm has five-layer structure, the specific battery diaphragm by porous basement membrane 10,
First ceramic layer 21, first porous heat-resistant layer 31, the 3rd ceramic layer and first tack coat 41 are constituted.
According to above-mentioned battery diaphragm, under preferable case, the battery diaphragm includes second porous heat-resistant layer 32 and institute
The second tack coat 42 is stated, and the battery diaphragm also includes being arranged on second porous heat-resistant layer 32 with second tack coat
The 4th ceramic layer between 42.The mechanical property being provided with beneficial to further optimization battery diaphragm of the 4th ceramic layer.Pass through
4th ceramic layer is set, the sandwich of the second ceramic layer/the second porous heat-resistant layer/the 4th ceramic layer can be formed, using pottery
Enamel coating further improves the resistance to elevated temperatures of battery diaphragm to the reinforcement effect of porous heat-resistant layer, using porous heat-resistant layer to pottery
The supporting role of enamel coating, further improves the toughness and intensity of battery diaphragm.Under preferable case, the battery diaphragm has nine layers
Structure, the specific battery diaphragm by second tack coat 42, the 4th ceramic layer, second porous heat-resistant layer 32,
Second ceramic layer 22, porous basement membrane 10, first ceramic layer 21, first porous heat-resistant layer 31, the 3rd pottery
Enamel coating and first tack coat 41 are constituted.
In the utility model, composition and preparation method on porous basement membrane, ceramic layer, porous heat-resistant layer and tack coat
The conventional method of this area is referred to, as long as according to the corresponding structure sheaf of structure setting that the utility model is limited.
For example, above-mentioned porous basement membrane can use existing polyalkene diaphragm in the utility model.The polyalkene diaphragm
It is the general barrier film of lithium ion battery, including polypropylene (PP) barrier film, polyethylene (PE) barrier film and PE/PP/PE three-layer membranes etc..
For example, ceramic layer (including the first ceramic layer and second ceramic layer) includes inorganic particle and glues in the utility model
Knot agent.Wherein, the inorganic particle is selected from Al2O3(including α, β, γ type), SiO2、BaSO4, titanium dioxide (TiO2, rutile or
Anatase), CuO, MgO, LiAlO2、ZrO2, CNT (CNT), BN, SiC, Si3N4、WC、BC、AlN、Fe2O3、BaTiO3、
MoS2、α-V2O5、PbTiO3、TiB2、CaSiO3, molecular sieve ZSM-5, one or more in clay or kaolin.The bonding
Agent may be selected from one or more in PVDF, P (VDF-HFP), PMMA, PAN, PI, PVP, PEO, PVA, CMC, SBR.
The above-mentioned method for preparing ceramic layer (including the first ceramic layer and second ceramic layer) includes：Will including inorganic particle,
The slurry of coating solvent and binding agent is coated on membrane surface, and the ceramic layer is formed in membrane surface after drying.More preferably feelings
Under condition, the particle diameter of the inorganic particle is 50nm~3 μm.In concrete operations, preferably above-mentioned coating solvent is used to assign slurry
Certain mobility, is easy to construction, and during subsequent technique, the coating solvent is removed, and is formed only comprising binding agent and upper
State the inorganic particles of inorganic particle.In the utility model, above-mentioned solvent is preferably 1-METHYLPYRROLIDONE (NMP), N ' N- bis-
In NMF (DMF), N ' N- dimethylacetylamides (DMAc), toluene, dichloromethane, chloroform, deionized water, ethanol
One or more.Under preferable case, in above-mentioned slurry, the weight ratio of inorganic particle, coating solvent and binding agent is 9~24：
67~500：1.
According to the utility model, porous heat-resistant layer (including the first porous heat-resistant layer and second porous heat-resistant layer) is preferably included
In PEI, polyacrylonitrile, copolymerization ether ether ketone, polyether sulfone, polyamidoimide, polyamic acid, polyvinylpyrrolidone
One or more；It is preferred that auxiliary polyalcohol can also be included, the auxiliary polyalcohol is selected from Kynoar, polyvinylidene fluoride
Alkene-hexafluoropropene, polyacrylate, PMA, polystyrene, in polymethyl methacrylate and polyethylene glycol oxide
One or more；It is preferred that also including ceramic particle, (specific material is with reference to note of the foregoing ceramic layer segment on ceramic particle
Carry).
According to the utility model, the preparation side of porous heat-resistant layer (including the first porous heat-resistant layer and second porous heat-resistant layer)
Method can be the conventional painting method (such as spraying and silk-screen printing) that can form loose structure.The system of the porous heat-resistant layer
Preparation Method can also be the method for electrostatic spinning.By taking method of electrostatic spinning as an example, the specific preparation method bag of porous heat-resistant layer is prepared
Include：By spinning polymer (active ingredient for forming porous heat-resistant layer, including foregoing described porous heat-resistant layer material)
Dissolving dispersion is configured to the spinning solution that concentration is 3~30wt% in a solvent.The more preferably spinning solution of 8~20wt%；
Then using the spinning solution of above-mentioned acquisition carries out electrostatic spinning to form porous heat-resistant layer.Wherein it is used to prepare spinning solution
Solvent is selected from 1-METHYLPYRROLIDONE, N ' dinethylformamides, N ' N- dimethylacetylamides, toluene, acetone, deionized water
One or more.
The general principle of the electrostatic spinning is known to the skilled person, specially in injection apparatus and receiving device
Between applied voltage, from the spinning solution of the cone end from injection apparatus, jet is set, and be stretched in the electric field, finally
Fiber is formed on receiving device.Wherein, the receiving device includes roller (rotatable) or receiver board.The electrostatic spinning
Method has generally included syringe needle spin processes and needle-less spin processes, and detailed process is known to those skilled in the art, herein not
Repeat.
When the method for electrostatic spinning is to there is syringe needle spin processes, the flow velocity of spinning solution is preferably 0.3-5mL/h, more preferably
It is 0.6-2mL/h；Spinning temperature is preferably 25-70 DEG C, more preferably 30-50 DEG C；Spinning humidity is preferably 2%-60%, more excellent
Elect 2%-50% as；Spinning voltage is preferably 5-25kV, more preferably 8-20kV.When flow velocity is in above-mentioned preferred scope, can
Ensure to obtain suitable fibre diameter, while blocking syringe needle can be prevented effectively from, it is ensured that spinning is smoothed out.Especially using
On the premise of the mixed solvent that the utility model is provided, coutroi velocity can be obtained with optimum porosity and glued within the above range
Tie the porous heat-resistant layer of performance.When spinning temperature and humidity within the above range when, coordinate with foregoing mixed solvent, it is ensured that spin
The smooth Cheng Sihou of fiber that silk is obtained is dried, it is to avoid fiber adhesion occurs and causes porosity to decline, and can avoid porous heat-resistant
The adhesive property of layer declines.When voltage within the above range when, can effectively excite spinning solution formed jet so that in the electric field
Effective stretching action is produced, the suitable fiber of diameter is obtained, it is ensured that the form of the fiber of formation, beneficial to raising porous heat-resistant layer
Porosity and adhesive property.Additionally, the reception device is preferably roller, and the rotating speed of roller is preferably 100-6000rpm,
More preferably 1000-2000rpm.When the linear velocity for collecting the surface of collection device of fiber is too small, due to quick fortune
Dynamic jet is mix, and the fiber for now being formed can be distributed in the state of random accumulation on collection device surface, obtain
Porous heat-resistant layer mechanical strength it is poor.And work as after collection device linear resonance surface velocity reaches to a certain degree, the fiber meeting of formation
Tightly it is attached on collection device surface in the way of circumference, fiber deposition direction is identical, and is substantially at its straight state,
Produce the straight fibre bundle for extending in the same direction.On the other hand, when collection device linear resonance surface velocity is excessive, due to too fast reception
Speed can destroy fiber jet, it is impossible to obtain continuous fiber.By the continuous experiment to conventional electrostatic spinning process, inventor
It was found that, when the rotating speed of collection device is 100-6000rpm, can obtain with the fibre bundle for extending in the same direction straight.It is preferred that feelings
Under condition, when the rotating speed of collection device is 1000-2000rpm, in the porous heat-resistant layer of acquisition, the form of fiber is more preferably, more sharp
In the mechanical strength for improving porous heat-resistant layer.
When the method for electrostatic spinning is needle-less spin processes, the condition of spinning is preferably included：Temperature is 25-70 DEG C, wet
It is 2%-60% to spend, and liquid pool translational speed is 0-2000mm/sec, and base material translational speed 0-20000mm/min (now collects dress
Be set to tabular, do not rotate) or drum rotation speed be 100-6000rpm (now collection device be roller), cathode voltage (is produced fine
The voltage of the source end of dimension) be 0-150kV, cathode voltage (voltage of collection device) be -50~0kV, voltage difference (source end with
Voltage difference between collection device) it is 10-100kV；More preferably include：Temperature is 30-50 DEG C, and humidity is 2%-50%, liquid pool
Translational speed is 100-400mm/sec, and base material translational speed is 1000-15000mm/min or drum rotation speed is 1000-
2000rpm, cathode voltage is 10-40kV, and cathode voltage is -30-0kV, and voltage difference is 20-60kV.
Again for example, the preparation method of tack coat is known to the skilled person in the utility model, including will bond
Agent polymer and organic solvent are mixed with binding agent slurry, and the slurry even application (for example spray and print) that will be obtained is in institute
State at least one side of barrier film, tack coat is formed after drying.Wherein described adhesive polymer can selected from polyvinylidene fluoride-
Co- hexafluoropropene, polyvinylidene fluoride -co- trifluoro-ethylene, polymethyl methacrylate, butyl polyacrylate, polyacrylonitrile,
Cellulose acetate-butyrate, polyvinylpyrrolidone, PEO, cyanoethyl pullulan, cyanoethyl polyvinylalcohol, cyanoethyl
Cellulose, cyanoethyl sucrose, any one or two or more mixtures of carboxymethylcellulose calcium；The solvent can be selected from third
Any one solvent in ketone, tetrahydrofuran, dichloromethane, chloroform, METHYLPYRROLIDONE (NMP), hexamethylene or
Two or more mixtures.
Meanwhile, a kind of lithium rechargeable battery is additionally provided in the utility model, the lithium rechargeable battery includes
Positive plate, negative plate, electrolyte and battery diaphragm, wherein, the battery diaphragm is above-mentioned battery diaphragm.
The electrolyte is known to the skilled person, and it is generally made up of electrolyte lithium salts and organic solvent.Wherein,
Electrolyte lithium salts uses dissociable lithium salts, for example, lithium hexafluoro phosphate (LiPF can be selected from6), lithium perchlorate (LiClO4), four
Lithium fluoroborate (LiBF4) etc. at least one, organic solvent can selected from ethylene carbonate (EC), propene carbonate (PC),
In dimethyl carbonate (DMC), methyl ethyl carbonate (EMC) and diethyl carbonate (DEC), vinylene carbonate (VC) etc. at least one
Kind.Preferably, the concentration of electrolyte lithium salts is 0.8~1.5mol/L in the electrolyte.
The positive plate is to be tuned into slurry by the positive electrode for lithium ion battery, conductive agent and binding agent to coat aluminium
It is made on paper tinsel.Positive electrode used includes arbitrarily can be used for the positive electrode of lithium ion battery, for example, cobalt-lithium oxide
(LiCoO2), nickel oxide lithium (LiNiO2), manganese oxide lithium (LiMn2O4), LiFePO 4 (LiFePO4) etc. at least one.
The negative plate is to be tuned into slurry by the negative material for lithium ion battery, conductive agent and binding agent to coat copper
It is made on paper tinsel.Negative material used includes arbitrarily can be used for the negative material of lithium ion battery, for example, graphite, soft carbon, hard carbon etc.
In at least one.
The lithium rechargeable battery that the utility model is provided it is main the improvement is that employ a kind of new battery every
Film, and the arrangement mode (connected mode) of positive plate, negative plate, battery diaphragm and electrolyte can be right with same as the prior art
This those skilled in the art can know that therefore not to repeat here.
The preparation method of the lithium rechargeable battery that the utility model is provided includes：By positive plate, battery diaphragm and negative pole
Piece stacks gradually or is wound into pole piece, then toward injecting electrolyte in the pole piece and seal, wherein, the battery diaphragm is upper
State battery diaphragm.Wherein, the material or composition of the positive plate, negative plate and electrolyte have been described herein above,
This is not repeated.
Preferred embodiment of the present utility model is described in detail above in association with accompanying drawing, but, the utility model is not limited
Detail in above-mentioned implementation method, in range of the technology design of the present utility model, can be to skill of the present utility model
Art scheme carries out various simple variants, and these simple variants belong to protection domain of the present utility model.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means.In order to avoid unnecessary repetition, the utility model is to each
Possible combination is planted no longer separately to illustrate.
Additionally, can also be combined between a variety of implementation methods of the present utility model, as long as it is not disobeyed
Thought of the present utility model is carried on the back, it should equally be considered as content disclosed in the utility model.
Claims (15)
1. a kind of battery diaphragm, it is characterised in that the battery diaphragm includes porous basement membrane (10), the porous basement membrane includes phase
To set first surface and second surface, the battery diaphragm be additionally included on the first surface of the porous basement membrane by it is interior extremely
Outer the first ceramic layer (21), the first porous heat-resistant layer (31) and the first tack coat (41) for setting gradually.
2. battery diaphragm according to claim 1, it is characterised in that first porous heat-resistant layer (31) is with fiber
The fibrage of network-like structure；Fibre diameter in the fibrage is 100~2000nm, and the porosity of the fibrage is
75%~93%.
3. battery diaphragm according to claim 1, it is characterised in that the thickness of the battery diaphragm is 5-50 μm, described
The thickness of porous basement membrane (10) is 5-30 μm, and the thickness of first ceramic layer (21) is 0.5-10 μm, and described first is porous resistance to
The thickness of thermosphere (31) is 0.5-20 μm, and the thickness of first tack coat (41) is 0.1-10 μm.
4. battery diaphragm according to claim 1, it is characterised in that the battery diaphragm has four-layer structure, by successively
The described porous basement membrane (10) that is stacked, first ceramic layer (21), first porous heat-resistant layer (31) and described
First tack coat (41) is constituted.
5. battery diaphragm according to claim 4, it is characterised in that the thickness of the battery diaphragm is 8-23 μm, described
The thickness of porous basement membrane (10) is 5-12 μm, and the thickness of first ceramic layer (21) is 1-5 μm, first porous heat-resistant layer
(31) thickness is 1-5 μm, and the thickness of first tack coat (41) is 0.1-3 μm.
6. battery diaphragm according to claim 1, it is characterised in that the battery diaphragm is additionally included in the porous basement membrane
(10) optional the second ceramic layer (22), the second optional porous heat-resistant layer set gradually from the inside to the outside on second surface
(32) at least one and in optional the second tack coat (42).
7. battery diaphragm according to claim 6, it is characterised in that the thickness of optional second ceramic layer (22) is
0-10 μm, the thickness of optional second porous heat-resistant layer (32) is 0-20 μm, optional second tack coat (42)
Thickness is 0-10 μm.
8. battery diaphragm according to claim 6, it is characterised in that set on the second surface of the porous basement membrane (10)
It is equipped with following structure sheaf：
The second ceramic layer (22) and the second porous heat-resistant layer (32) for setting gradually from the inside to the outside；Or
The second ceramic layer (22) and the second tack coat (42) for setting gradually from the inside to the outside；Or
The second porous heat-resistant layer (32) and the second tack coat (42) for setting gradually from the inside to the outside；Or
The second ceramic layer (22), the second porous heat-resistant layer (32) and the second tack coat (42) for setting gradually from the inside to the outside.
9. battery diaphragm according to claim 6, it is characterised in that the battery diaphragm has six layer structure, by by suitable
Second tack coat (42), second ceramic layer (22), the porous basement membrane (10), described that sequence is cascading
One ceramic layer (21), first porous heat-resistant layer (31) and first tack coat (41) composition.
10. battery diaphragm according to claim 9, it is characterised in that the thickness of the battery diaphragm is 10-30 μm, institute
It is 5-20 μm to state the thickness of porous basement membrane (10), and the thickness of first ceramic layer (21) is 1-5 μm, second ceramic layer
(22) thickness is 1-5 μm, and the thickness of first porous heat-resistant layer (31) is 1-5 μm, the thickness of first tack coat (41)
It is 0.1-3 μm to spend, and the thickness of second tack coat (42) is 0.1-3 μm.
11. battery diaphragms according to claim 6, it is characterised in that the battery diaphragm has seven-layer structure, by by suitable
Second tack coat (42) that sequence is cascading, second porous heat-resistant layer (32), second ceramic layer (22),
The porous basement membrane (10), first ceramic layer (21), first porous heat-resistant layer (31) and first tack coat
(41) constitute.
12. battery diaphragms according to claim 11, it is characterised in that the thickness of the battery diaphragm is 10-30 μm, institute
It is 5-20 μm to state the thickness of porous basement membrane (10), and the thickness of first ceramic layer (21) is 1-5 μm, second ceramic layer
(22) thickness is 1-5 μm, and the thickness of first porous heat-resistant layer (31) is 1-5 μm, second porous heat-resistant layer (32)
Thickness be 1-5 μm, the thickness of first tack coat (41) is 0.1-3 μm, and the thickness of second tack coat (42) is
0.1-3μm。
13. battery diaphragms as claimed in any of claims 1 to 8, it is characterised in that also wrapped in the battery diaphragm
Include the 3rd ceramic layer being arranged between first porous heat-resistant layer (31) and first tack coat (41).
14. battery diaphragm according to any one in claim 6 to 8, it is characterised in that the battery diaphragm includes
Second porous heat-resistant layer (32) and second tack coat (42), and also include being arranged on described the in the battery diaphragm
The 4th ceramic layer between two porous heat-resistant layers (32) and second tack coat (42).
A kind of 15. lithium rechargeable batteries, including positive pole, negative pole, and the battery being placed between the positive pole and the negative pole
Barrier film, it is characterised in that battery diaphragm of the battery diaphragm described in any one in claim 1 to 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620970667.9U CN206210903U (en) | 2016-08-29 | 2016-08-29 | A kind of battery diaphragm and the lithium rechargeable battery including it |
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|---|---|---|---|
| CN201620970667.9U CN206210903U (en) | 2016-08-29 | 2016-08-29 | A kind of battery diaphragm and the lithium rechargeable battery including it |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018040903A1 (en) * | 2016-08-29 | 2018-03-08 | 比亚迪股份有限公司 | Lithium ion battery separator and preparation method therefor, and lithium ion battery |
| WO2018040905A1 (en) * | 2016-08-29 | 2018-03-08 | 比亚迪股份有限公司 | Polymer composite film and preparation method therefor and lithium ion battery comprising same |
-
2016
- 2016-08-29 CN CN201620970667.9U patent/CN206210903U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018040903A1 (en) * | 2016-08-29 | 2018-03-08 | 比亚迪股份有限公司 | Lithium ion battery separator and preparation method therefor, and lithium ion battery |
| WO2018040905A1 (en) * | 2016-08-29 | 2018-03-08 | 比亚迪股份有限公司 | Polymer composite film and preparation method therefor and lithium ion battery comprising same |
| US11223090B2 (en) | 2016-08-29 | 2022-01-11 | Byd Company Limited | Polymer composite membrane, preparation method thereof, and lithium-ion battery including the same |
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