CN110010830A - A kind of lithium battery diaphragm - Google Patents
A kind of lithium battery diaphragm Download PDFInfo
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- CN110010830A CN110010830A CN201910329119.6A CN201910329119A CN110010830A CN 110010830 A CN110010830 A CN 110010830A CN 201910329119 A CN201910329119 A CN 201910329119A CN 110010830 A CN110010830 A CN 110010830A
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- lithium battery
- layer
- inorganic coating
- polyethylene layer
- fire
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 50
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 49
- -1 polyethylene Polymers 0.000 claims abstract description 80
- 239000004698 Polyethylene Substances 0.000 claims abstract description 55
- 239000004743 Polypropylene Substances 0.000 claims abstract description 48
- 229920000573 polyethylene Polymers 0.000 claims abstract description 45
- 239000003063 flame retardant Substances 0.000 claims abstract description 41
- 239000011248 coating agent Substances 0.000 claims abstract description 38
- 238000000576 coating method Methods 0.000 claims abstract description 38
- 229920001155 polypropylene Polymers 0.000 claims abstract description 38
- 239000002775 capsule Substances 0.000 claims abstract description 25
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 229920001903 high density polyethylene Polymers 0.000 claims description 8
- 239000004700 high-density polyethylene Substances 0.000 claims description 8
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 150000001336 alkenes Chemical class 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000002033 PVDF binder Substances 0.000 claims description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims 1
- 238000002844 melting Methods 0.000 claims 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 8
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 8
- 239000011148 porous material Substances 0.000 abstract description 8
- 238000004880 explosion Methods 0.000 abstract description 3
- 238000003780 insertion Methods 0.000 abstract description 2
- 230000037431 insertion Effects 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 66
- 238000000034 method Methods 0.000 description 23
- 239000000463 material Substances 0.000 description 12
- 239000003792 electrolyte Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 239000013078 crystal Substances 0.000 description 7
- 210000004027 cell Anatomy 0.000 description 4
- 239000011162 core material Substances 0.000 description 4
- 210000001787 dendrite Anatomy 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920001410 Microfiber Polymers 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 210000000981 epithelium Anatomy 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 125000002573 ethenylidene group Chemical group [*]=C=C([H])[H] 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001535 kindling effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002641 lithium Chemical group 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000003658 microfiber Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/446—Composite material consisting of a mixture of organic and inorganic materials
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Composite Materials (AREA)
- Inorganic Chemistry (AREA)
- Laminated Bodies (AREA)
- Cell Separators (AREA)
- Secondary Cells (AREA)
Abstract
The invention belongs to lithium-ion technology fields, disclose a kind of lithium battery diaphragm, including inorganic coating, polyethylene layer and polypropylene layer, the two sides of inorganic coating is fitted with polyethylene layer respectively, polyethylene layer is fitted with polypropylene layer away from inorganic coating on one side, fire-retardant capsule is equipped in polyethylene layer, fire-retardant capsule includes Kynoar clad and the triphenyl phosphate fire retardant in Kynoar clad.A kind of lithium battery diaphragm provided by the present invention, it is bonded polyethylene layer and polypropylene layer respectively on inorganic coating two sides, increase lithium battery diaphragm thickness, and because inorganic coating is caught in the middle, greatly increase the safety of diaphragm, effective high temperature closed pore mechanism of PP, PE and the insertion of fire-retardant capsule, improve lithium battery big self-discharge phenomenon and short circuit caused by it is on fire, explosion etc. security risks.
Description
Technical field
The invention belongs to lithium-ion technology fields, and in particular to a kind of lithium battery diaphragm.
Background technique
With the development of new energy industry, the importance of lithium battery is gradually shown especially.Lithium an- ode material has high
Specific discharge capacity, low-density and low reduction potential, it is considered to be a kind of ideal negative electrode of rechargeable batteries material.Lithium battery storage
Deposit that energy density is high, self-discharge rate is low, long service life, adaptable, stand-by time is long, but at high cost, poor safety performance, has
Explosion danger.Lithium battery positive and negative pole material is layer structure, and lithium ion is embedding in the layered structure, and flows between positive and negative anodes
It is dynamic.When lithium battery is in charged state, lithium ion deintercalation from positive electrode is flowed to cathode.Experimental data is shown when charging
When voltage is higher than specified maximum charge limitation voltage, remaining lithium atom quantity is less than normal value half, anode in positive electrode
Material stratiform memory location starts to collapse, and at this time if continuing to charge, lithium ion can be in cathode material after being full of negative electrode material memory location
Expect that surface is accumulated in dendrite state, diaphragm is pierced through in the crystallization of these lithium ions, and inside battery positive and negative anodes can be made short-circuit.Work as charging
When electric current is excessive, lithium ion has little time to enter memory location, will be gathered in positive and negative pole material surface, puncture diaphragm after accumulative crystallization
Short circuit occurs.Short circuit or high temperature caused by overcharging crack electrolyte, generate gas, cause cell internal pressure to increase, shell
Bulging rupture, oxygen enters to react with the lithium for being deposited in electrode surface, and then explodes.So lithium battery diaphragm is lithium battery
In it is most important composition one of, preparing safe and environment-friendly, inexpensive diaphragm is the difficult point in production process.Currently, lithium battery every
The manufacturing method of film has wet process and two kinds of dry method.Wherein wet process is needed using a large amount of organic diluents, and the device is complicated, cost
Height easily causes environmental pollution.Dry method with respect to wet process for, equipment is simple, at low cost, non-environmental-pollution problem.Dry method is mainly divided
For dry method simple tension and dry method biaxial tension technology.The microporous barrier pore-forming of dry method biaxial tension technology preparation is uneven, mainly
It is that the position of pore-forming and the size of pore-forming are uncontrollable during beta crystal is to a transformation of crystal due to polypropylene.So now dry
The prevailing technology of method diaphragm is dry method simple tension.The technique is highly developed in the U.S., Japan after decades of development,
Celgard company, the present U.S., UBE company, Japan produce diaphragm using such technique.
The structure and performance of lithium battery diaphragm are most important to the safety of lithium battery: one side single layer lithium battery diaphragm holds
A small amount of defect is tended to have, procedure for producing controls difficulty height, it is therefore preferred that the lacking each single-layer septum by laminated diaphragm design
It falls into cover；On the other hand further stop or prevent if diaphragm can be breaking in time at the initial stage of battery short circuit heating
Short circuit can greatly improve the safety of lithium battery.Existing wet process diaphragm usually uses ultrahigh molecular weight polyethylene standby, melts
Body flowing velocity is slow, and pyrocondensation is big in temperature-rise period, cannot timely closed pore.Dry method polypropylene diaphragm closed pore temperature is higher, heats up
Pyrocondensation is big in journey, so cell safety cannot be responded and protected faster, dry method polypropylene (abbreviation PP)/polyethylene (abbreviation
PE in)/polypropylene three-layer membrane, only polyethylene layer is as protection, in the case where especially PE layers very thin, when temperature is into one
Step raising can occur rupture of membranes and continue to occur so as to cause short circuit.In addition, the diaphragm with ceramic coating, generally also only one layer anti-
Shield, when accumulative heat causes temperature that cannot effectively play protective action when continuing and increase.When battery is in high temperature ring
Under border, diaphragm can be shunk, cause positive/negative plate contact and it is short-circuit, cause battery steep temperature rise even cause it is on fire, explode etc. it is hidden
Suffer from.In the case that battery is squeezed by external force, pierced through simultaneously, positive and negative anodes are also easy contact, and instantaneous short circuit can also occur for battery, no
Security risk is only caused, also cause cell voltage decrease speed causes self-discharge of battery excessive fastly.Existing PP or PE diaphragm
It is not easy high temperature resistant (shrink under high temperature larger, lead to positive/negative plate) and low puncture strength.Therefore, the safety of lithium battery is logical
Often requiring higher thermal shrinkage can be with higher puncture strength.
Micro- fire-retardant capsule, which refers to, is wrapped up solia particle or liquid droplet using natural or synthesis high molecular material
The miniature vessel come, fire-retardant capsule diameter are generally 5-200 microns.The epithelium of package is known as wall material, and package substance is known as
Core material.In use, made micro- fire-retardant capsule is mixed with high molecular material or other materials, impose on the substrate applied, uses
The means of heating, pressurization or radiation make fire-retardant capsule wall breakdown, release wrapped up substance, application performance required for generating
Or institute's capsule membrane is not destroyed, wrappage discharges outward by packing membrane diffusion, generates the effect of control performance.Micro- fire-retardant capsule
When the advantage of technology is to form fire-retardant capsule, capsule-core is isolated by package and with external environment, its property can have no effect ground
Be retained, and capsule-core can be released again under proper condition, when wall material is destroyed, this to use bring it is many just
Benefit.
Summary of the invention
In order to solve the above problems existing in the present technology, it is an object of that present invention to provide one kind to have fire-retardant capsule structure
Lithium battery diaphragm.
The technical scheme adopted by the invention is as follows:
A kind of lithium battery diaphragm, including inorganic coating, polyethylene layer and polypropylene layer, the two sides of inorganic coating are bonded respectively
There is polyethylene layer, polyethylene layer is fitted with polypropylene layer away from inorganic coating on one side, fire-retardant capsule, resistance are equipped in polyethylene layer
Combustion capsule includes Kynoar (abbreviation PVDF) clad and the triphenyl phosphate (contracting in Kynoar clad
Write TPP) fire retardant.
The fire-retardant capsule is made of the Kynoar clad of the microfibre with core-shell structure, wherein phosphoric acid triphen
Ester fire retardant is core, and Kynoar clad is shell.Triphenyl phosphate fire retardant is encapsulated in Kynoar clad,
It prevents the directly exposure of triphenyl phosphate fire retardant and is dissolved into electrolyte, it is therefore prevented that it is to the negative of battery performance
It influences.In heat triggering, then the triphenyl phosphate fire retardant of encapsulation is discharged into electrolyte by the fusing of Kynoar clad
In, to effectively inhibit the kindling and burning of electrolyte.
Preferably, the weight ratio of the triphenyl phosphate fire retardant and Kynoar clad is (7-9): 2.
Preferably, the inorganic coating is silicon dioxide layer.
Preferably, the polypropylene layer by isotacticity be greater than or equal to 96%, melt index 0.3-5g/10min and into
The polypropylene of row beta nucleater conversion is made；The porosity of polypropylene layer is 20%-60%.
Preferably, the polyethylene layer is made of the high density polyethylene (HDPE) of melt index 0.05-5g/10min, polyethylene layer
Porosity be 20%-60%.
Preferably, the porosity of the inorganic coating is 10%-70%.
Preferably, the polyethylene layer with a thickness of 5-10 μm, polypropylene layer with a thickness of 5-10 μm, the thickness of inorganic coating
Degree is 0.5-1 μm.
Preferably, the fusing-off temperature of the polyethylene layer is 125 DEG C -135 DEG C；The fusing-off temperature of polypropylene layer is 155
℃-165℃；The heat resisting temperature of inorganic coating is higher than 200 DEG C.
The invention has the benefit that
1, a kind of lithium battery diaphragm provided by the present invention is bonded polyethylene layer and polypropylene on inorganic coating two sides respectively
Layer increases lithium battery diaphragm thickness, and because inorganic coating is caught in the middle, greatly increases the safety of diaphragm, PP, PE
Effective high temperature closed pore mechanism and fire-retardant capsule insertion, improve lithium battery big self-discharge phenomenon and short circuit caused by it is on fire,
The security risks such as explosion.
2, a kind of lithium battery diaphragm provided by the present invention, beta crystal PP, the high density PE and inorganic coating three's material of improvement
Puncture strength of the material than conventional PP, PE or PP and PE composite material is high, and lithium battery manufacturing process can be greatly lowered and make
With the short circuit phenomenon generated in the process.The multiple protective of structure layer by layer of lithium battery diaphragm battery is guaranteeing that lithium battery can be high
Under the premise of imitating work, while also solving a series of because flammable electrolyte, ultra-thin diaphragm, the dendrite hidden etc. is brought
Cell safety problem.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the structural schematic diagram of lithium battery diaphragm of the present invention.
Fig. 2 is the plan view of polyethylene layer of the present invention.
In figure: 1- inorganic coating；2- polyethylene layer；3- polypropylene layer；The fire-retardant capsule of 4-.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more of the features.In the description of the present invention,
The meaning of " plurality " is two or more, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.
As depicted in figs. 1 and 2, the present embodiment provides a kind of lithium battery diaphragm, including inorganic coating 1, polyethylene layer 2 and poly-
Propylene layer 3, the two sides of inorganic coating 1 are fitted with polyethylene layer 2 respectively, and polyethylene layer 2 is bonded away from the one side of inorganic coating 1
There is polypropylene layer 3, fire-retardant capsule 4 is equipped in polyethylene layer 2, fire-retardant capsule 4 includes Kynoar clad and is set to poly-
Triphenyl phosphate fire retardant in vinylidene clad.
It is bonded polyethylene layer 2 and polypropylene layer 3 respectively on 1 two sides of inorganic coating, increases lithium battery diaphragm thickness, and
Because inorganic coating 1 is caught in the middle, safety, thermal shrinkage energy and the puncture strength of diaphragm are greatly increased, is significantly dropped
The short circuit phenomenon generated in low lithium battery manufacturing process and use process improves the self-discharge phenomenon of lithium battery and reduces safe hidden
Suffer from.
Silicon dioxide layer can be used in inorganic coating 1, and silicon dioxide layer can not only prevent dendrite puncture from causing battery short circuit,
And due to the high-specific surface area of silicon dioxide layer and its to the good wellability of electrolyte, lithium battery diaphragm also show compared with
High porosity and imbibition rate, the introducing of silicon dioxide layer not only significantly improve the thermal stability and machinery of lithium battery diaphragm
Performance, and enhance the absorption to electrolyte.
The more conventional lithium battery diaphragm of the air permeability of the lithium battery diaphragm (PP, PE, PP and PE meet) is low, battery high rate performance
More preferably, though in battery use process because electrolyte impregnate adhesive be corroded, will not fall off between each layer, because without
Influence the performance of battery product.
Triphenyl phosphate fire retardant is encapsulated in Kynoar clad, it is therefore prevented that triphenyl phosphate fire retardant is directly molten
Otherwise solution can have a negative impact to battery performance into electrolyte.During lithium ion battery thermal runaway, polyethylene layer 2
In fire-retardant capsule 4 can be released triphenyl phosphate (TPP) fire retardant, since temperature raises, Kynoar by heat of solution
Clad can melt, and discharge fire retardant, effectively inhibit the burning of inflammable electrolyte.
In the present embodiment, the weight ratio of triphenyl phosphate fire retardant and Kynoar clad is (7-9): 2.
Polyethylene layer 2 is made of the high density polyethylene (HDPE) of melt index 0.05-5g/10min, the porosity of polyethylene layer 2
For 20%-60%.Using the high density polyethylene (HDPE) of melt index 0.05-5g/10min, it is ensured that the raised mistake of battery temperature
It can be in the quick closed pore of lower temperature in journey.And polypropylene layer 3 is greater than or equal to 96%, melt index 0.3- by isotacticity
5g/10min and carry out beta nucleater conversion polypropylene be made；The porosity of polypropylene layer 3 is 20%-60%.Also for
Guaranteeing being capable of secondary closed pore during battery heats up.The pp of beta crystal has preferable toughness and higher heat distortion temperature.
Adding beta nucleater is to obtain one of most effective approach of beta crystal pp.By being added in pp there is the beta crystal of nucleation to improve
Crystal transfer occurs during stretching and forms micropore using the difference of the density between pp different phase for agent.
The fusing-off temperature of polyethylene layer 2 is 125 DEG C -135 DEG C；The fusing-off temperature of polypropylene layer 3 is 155 DEG C -165 DEG C；Nothing
The heat resisting temperature of organic coating 1 is higher than 200 DEG C.Inorganic coating 1 can play the role of high-temperature support, and due to itself with high temperature resistant
Material hardness prevents greatly the dendrite puncture due to generating in battery use process from causing short circuit.In lithium battery because short circuit is warming up to
When 130 DEG C, polyethylene layer 2 occurs to melt closed pore open circuit first, protects battery, in temperature continuation elevation process, poly- second
The polyethylene of alkene layer 2 can penetrate into the polypropylene hole of polypropylene layer 3, while polypropylene layer 3 can also melt closed pore, carry out the second level
The effect of multilevel security protection is played in protection.
The porosity of inorganic coating 1 is 10%-70%.
In lithium battery diaphragm, the thickness of polyethylene layer 2 and the thickness of polypropylene layer 3 are all larger than the thickness of inorganic coating 1,
The thickness of polyethylene layer 2 is greater than the thickness of fire-retardant capsule 4.The thickness of polyethylene layer 2 can be identical with the thickness of polypropylene layer 3,
Can also be different, specifically, polyethylene layer 2 with a thickness of 5-10 μm, polypropylene layer 3 with a thickness of 5-10 μm, inorganic coating 1
With a thickness of 0.5-1 μm.
In various embodiments, the thickness of the thickness of polyethylene layer 2, the thickness of inorganic coating 1 and polypropylene layer 3
It can be using following setting:
(1) polyethylene layer 2 is with a thickness of 7 microns, and inorganic coating 1 is with a thickness of 1 micron, and polypropylene layer 3 is with a thickness of 7 microns, resistance
Fire capsule 4 with a thickness of 6 microns；
(2) polyethylene layer 2 is with a thickness of 10 microns, and for inorganic coating 1 with a thickness of 0.5 micron, polypropylene layer 3 is micro- with a thickness of 10
Rice, fire-retardant capsule 4 with a thickness of 8 microns；
(3) polyethylene layer 2 is with a thickness of 10 microns, inorganic coating 1 with a thickness of 1 micron, polypropylene layer 3 with a thickness of 6 microns,
Fire-retardant capsule 4 with a thickness of 5 microns.
In various embodiments, the weight ratio of triphenyl phosphate fire retardant and Kynoar clad can be using such as
Lower setting:
(1) weight ratio of triphenyl phosphate fire retardant and Kynoar clad is 7:2；
(2) weight ratio of triphenyl phosphate fire retardant and Kynoar clad is 9:2；
(3) weight ratio of triphenyl phosphate fire retardant and Kynoar clad is 8:2.
The present invention is not limited to above-mentioned optional embodiment, anyone can show that other are each under the inspiration of the present invention
The product of kind form.Above-mentioned specific embodiment should not be understood the limitation of pairs of protection scope of the present invention, protection of the invention
Range should be subject to be defined in claims, and specification can be used for interpreting the claims.
Claims (8)
1. a kind of lithium battery diaphragm, it is characterised in that: inorganic including inorganic coating (1), polyethylene layer (2) and polypropylene layer (3)
The two sides of coating (1) is fitted with polyethylene layer (2) respectively, and polyethylene layer (2) is fitted with poly- third away from inorganic coating (1) on one side
Alkene layer (3), polyethylene layer (2) is interior to be equipped with fire-retardant capsule (4), and fire-retardant capsule (4) includes Kynoar clad and is set to
Triphenyl phosphate fire retardant in Kynoar clad.
2. lithium battery diaphragm according to claim 1, it is characterised in that: the triphenyl phosphate fire retardant and polyvinylidene fluoride
The weight ratio of alkene clad is (7-9): 2.
3. lithium battery diaphragm according to claim 1, it is characterised in that: the inorganic coating (1) is silicon dioxide layer.
4. lithium battery diaphragm according to claim 1 to 3, it is characterised in that: the polypropylene layer (3) is by isotacticity
Polypropylene more than or equal to 96%, melt index by 0.3-5g/10min and progress beta nucleater conversion is made；Polypropylene layer
(3) porosity is 20%-60%.
5. lithium battery diaphragm according to claim 1 to 3, it is characterised in that: the polyethylene layer (2) is referred to by melting
The high density polyethylene (HDPE) of number 0.05-5g/10min is made, and the porosity of polyethylene layer (2) is 20%-60%.
6. lithium battery diaphragm according to claim 1 to 3, it is characterised in that: the porosity of the inorganic coating (1)
For 10%-70%.
7. lithium battery diaphragm according to claim 1 to 3, it is characterised in that: the polyethylene layer (2) with a thickness of
5-10 μm, polypropylene layer (3) with a thickness of 5-10 μm, inorganic coating (1) with a thickness of 0.5-1 μm.
8. lithium battery diaphragm according to claim 1 to 3, it is characterised in that: the fusing temperature of the polyethylene layer (2)
Degree is 125 DEG C -135 DEG C；The fusing-off temperature of polypropylene layer (3) is 155 DEG C -165 DEG C；The heat resisting temperature of inorganic coating (1) is higher than
200℃。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910329119.6A CN110010830A (en) | 2019-04-23 | 2019-04-23 | A kind of lithium battery diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910329119.6A CN110010830A (en) | 2019-04-23 | 2019-04-23 | A kind of lithium battery diaphragm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110010830A true CN110010830A (en) | 2019-07-12 |
Family
ID=67173716
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| CN201910329119.6A Pending CN110010830A (en) | 2019-04-23 | 2019-04-23 | A kind of lithium battery diaphragm |
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Cited By (4)
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| CN113078412A (en) * | 2019-12-17 | 2021-07-06 | 山东海科创新研究院有限公司 | Flame-retardant composite diaphragm, preparation method thereof and lithium ion battery |
| CN113212959A (en) * | 2021-04-21 | 2021-08-06 | 苏州思脉新材料科技有限公司 | Medical sterilization packaging bag and using method thereof |
| CN113471629A (en) * | 2021-06-25 | 2021-10-01 | 湖南中锂新材料有限公司 | Diaphragm of composite coating structure and preparation method thereof |
| CN114094099A (en) * | 2020-07-29 | 2022-02-25 | 辉能科技股份有限公司 | Thermal runaway inhibitor and application thereof |
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| CN114094099B (en) * | 2020-07-29 | 2024-05-07 | 辉能科技股份有限公司 | Thermal runaway inhibitor and application thereof |
| CN113212959A (en) * | 2021-04-21 | 2021-08-06 | 苏州思脉新材料科技有限公司 | Medical sterilization packaging bag and using method thereof |
| CN113471629A (en) * | 2021-06-25 | 2021-10-01 | 湖南中锂新材料有限公司 | Diaphragm of composite coating structure and preparation method thereof |
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