CN110512306A - A kind of preparation method for the dielectric film inhibiting solid state lithium battery lithium dendrite growth - Google Patents
A kind of preparation method for the dielectric film inhibiting solid state lithium battery lithium dendrite growth Download PDFInfo
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Abstract
The present invention relates to inhibit solid state lithium battery lithium dendrite growth technical field, and in particular to a kind of preparation method for the dielectric film for inhibiting solid state lithium battery lithium dendrite growth.A kind of preparation method of dielectric film inhibiting solid state lithium battery lithium dendrite growth is made of following steps: being prepared spinning solution respectively using polyacrylonitrile (PAN) and polymetylmethacrylate, linear polymer and is carried out coaxial spinning, it is cooled and solidified rapidly after carrying out heat treatment stretching to the membrane material of formation during the spinning process, each solution flow velocity PMMA > linear polymer > PAN in the solution spinning process；Membrane material is placed in lithium-ion battery electrolytes later and is impregnated；Membrane material is finally placed in 14.5~15.5min of processing at 80~90 DEG C, obtains required solid electrolyte film, the solid electrolyte film is PMMA/ linear polymer/PAN multi-layer core-shell structure fiber composite film forming.The present invention efficiently solves PMMA poor mechanical property and is difficult to the disadvantage for inhibiting lithium dendrite growth and PAN unstable to lithium metal.
Description
Technical field
The present invention relates to inhibit solid state lithium battery lithium dendrite growth technical field, and in particular to a kind of inhibition solid state lithium battery
The preparation method of the dielectric film of lithium dendrite growth.
Background technique
Lithium ion energy density is high, and stability is strong, and memory-less effect has extended cycle life, as a kind of commercialized efficient
Energy storage device is widely applied.Electrolyte used in conventional lithium ion battery is the lithium hexafluoro phosphate of liquid, due to
Its own is extremely unstable, and easy decomposition leads to battery flatulence, at the same in high temperature, short circuit, overcharge or whens physical impacts easily burns
And explosion.Although protection mechanism is added by outer enclosure, still there is biggish security risk.Solid lithium ion battery makes
Liquid electrolyte is substituted with solid electrolyte, can fundamentally solve the safety problem of liquid lithium ionic cell and uses warm area
Problem.Many scientific research personnel are absorbed in research polymer gel electrolyte, and introducing liquid solvent by polymeric inner makes its tool
There is higher ionic mobility.Typical polymer has PVDF, PVC, PAN, PVP, PMMA etc., and this kind of material price is cheap, comes
Source is wide, while its lithium ion conductivity rather moderate, very tempting in the prospect of technology production.But polymer gel electricity
The problem of for solution matter since inside is there are big quantity of fluid, mechanical property is poor, is easy to appear leakage and lithium dendrite growth.Patent
201710003124.9 proposing a kind of PEO base solid polymer electrolyte membrane and preparation method thereof, passes through PEO and PMMA and be copolymerized
Back loading lithium salts prepares gelatinous solid electrolyte, solves the problems, such as conventional solid-state gel-form solid polymer electrolyte leakage, but
It is difficult to the growth for effectively limiting Li dendrite.Therefore, the inhibition for solid gel polymer dielectric lithium dendrite growth has
Highly important practical significance.
Disclosing one kind application No. is the patent application of CN201410715763.4 can be used as lithium ion battery with novel solid
State membrane materials for electrolyte and its preparation method and application.The material is containing poly- fluorine sulfimide base lithium salts and polyethylene oxide structure
Block copolymer, molecular structure such as formula (I).This method is by Han fluorine Dan Ti ﹑ polyethylene oxide mixed dissolution in dry acetonitrile
In, and acid binding agent is added, 1d~10d is reacted under the conditions of being placed in 0~100 DEG C, obtains the polymer of metal ion salt form；It will be golden
The polymer for belonging to ion salt form is dissolved in organic solvent, is added and is carried out lithium ion exchanged reaction, obtains the polymerization of lithium salt form
Object.Material of the present invention can be used as cell solid electrolyte material and be applied in preparing lithium battery.Material of the present invention is as solid
Body electrolyte inhibits lithium dendrite growth in lithium ion battery, improves lithium ion transference number, the high conductivity of room temperature and stable
There is preferable application prospect on circulating battery.
Application No. is the patent applications of CN201810400093.5 to disclose a kind of organo-mineral complexing dielectric film, including
The double-layer structure being made of layer one and layer two；Layer one and layer two are made of the slurry for including ingredient same as below: inorganic solid-state
Electrolyte, lithium salts, film forming agent, conducting lithium ions polymer, plasticizer and solvent；Wherein, the inorganic solid electrolyte of layer one contains
The inorganic solid electrolyte content of amount>layer two, conducting lithium ions polymer content<layer two conducting lithium ions polymer of layer one
Content.The invention also discloses the batteries comprising above-mentioned Organic-inorganic composite dielectric film.Organic-inorganic composite electricity of the present invention
The flexibility of solution plasma membrane is good, conductivity is high, and meets the difference requirement of lithium ion cell positive, cathode to film simultaneously, can
The growth for inhibiting Li dendrite, improves the comprehensive performance of battery.
Application No. is the patent applications of CN201610214376.1 to disclose a kind of lithium battery solid electrolyte film and its system
Preparation Method, this method include the patch negative side Coating Ions conductive particle in the polymer film with gap, patch side of the positive electrode coating
Ionic conduction particle or ionic conductivity particle, are prepared Ranvier's membrane；Assemble lithium battery, Ranvier's membrane be used as lithium battery every
Film；During charging and discharging lithium battery, the liquid electrolyte of negative side is converted into solid electrolyte in the gap of Ranvier's membrane, raw
At solid electrolyte film.The preparation method is a kind of method of in-situ preparation solid electrolyte film, and this method step is simple, can be with
Compatible existing battery manufacturing process, further reduced the production cost of solid metal lithium battery；The solid of this method preparation
Dielectric film can effectively inhibit the growth of Li dendrite and inhibit puncture of the Li dendrite to diaphragm, reduce lithium metal with
It is further chemically reacted between electrolyte, metal lithium electrode can be effectively protected.
Application No. is: a kind of inhibition lithium dendrite growth cobalt acid lithium electrolysis of the patent application publication of CN201810052577.5
The preparation method of matter, the method is simple to operation, at low cost, and time-consuming short, the method adulterates Nb ion in positive electrode,
Same order elements are carried out to the Co ionic sites in positive electrode lattice, changes lattice parameter, obtains the nothing of excellent electrochemical performance
Machine electrolyte；It using lightweight carbon nitrogen polymer as filler in the present invention, is uniformly mixed with electrolyte, forms solid electrolyte,
It can be used for inhibiting the growth of dendrite in lithium metal battery.
Application No. is: the patent application of CN201810163648.9 discloses a kind of composite solid electrolyte, including first
Solid electrolyte layer and the second solid electrolyte layer, wherein the first solid electrolyte layer is polymer solid electrolyte layer, second
Solid electrolyte layer includes copolymer solid electrolyte and inorganic solid electrolyte, and the second solid electrolyte layer is in the composite solid
Mass content in body electrolyte is 50~90%, and mass content of the inorganic solid electrolyte in the second solid electrolyte layer is
10~70%；The invention also discloses method for preparing composite solid electrolyte and its applications；Complex solid disclosed by the invention
Electrolyte combines the advantages of inorganic solid electrolyte and copolymer solid electrolyte, and conductivity is high, and electrochemical window mouth width can have
Effect inhibits lithium dendrite growth, prevents the dusting of metal negative electrode, preparation method is simple, easy to industrialized production.
Summary of the invention
For the serious problem of existing polymer dielectric lithium dendrite growth, the first purpose of this invention is to propose one kind
Inhibit the preparation method of the dielectric film of solid state lithium battery lithium dendrite growth.
In order to achieve the above first purpose, a kind of system for the dielectric film for inhibiting solid state lithium battery lithium dendrite growth of the present invention
Preparation Method, steps are as follows for specific method:
(a) using polyacrylonitrile (PAN) and polymetylmethacrylate, linear polymer prepare respectively spinning solution carry out it is wet
The coaxial spinning of method cools and solidifies rapidly after carrying out heat treatment stretching to the membrane material of formation during the spinning process；The polyacrylonitrile
The spinning solution of preparation is the spinning solution for being 15% as the mass concentration of solvent using dimethyl sulfoxide；The linear polymer spinning solution
For the linear polyethylene spinning solution for being 17% as the mass concentration of solvent using dimethyl sulfoxide；The polymethyl methacrylate is matched
The spinning solution of system is that the dispersion of polymethyl methacrylate micro mist is swollen the spinning that lysigenous mass concentration is 18% in acetone
Liquid；Each spinning flow velocity PMMA > linear polymer > PAN in the spinning process；The coaxial spinning is from the outer to the inner
It is followed successively by polymethyl methacrylate, linear polymer, polyacrylonitrile；
(b) membrane material that (a) step is prepared is placed in lithium-ion battery electrolytes after and is impregnated；
(c) membrane material after finally impregnates (b) step is placed in 14.5~15.5min of processing at 80~90 DEG C, obtains required consolidate
Body dielectric film.
Preferably, each solution flow velocity PMMA in solution spinning process described in (a) step: linear polymer: PAN be 1.3~
1.6:1.1~1.2:0.8~1.0.
It is further preferred that each solution flow velocity PMMA in solution spinning process described in (a) step: linear polymer: PAN is
1.4~1.5:1.1~1.2:0.9~1.0.
Preferably, membrane material described in (a) step carries out heat treatment stretching, is specifically warming up to the membrane material formed in receiver board
120 DEG C of stretchings, stretching ratio are controlled in 3-5.
Preferably, smooth pressed sizing is carried out to membrane material using acrylic board in heat treatment process described in (a) step.Pass through
Membrane material is sandwiched among two plates by acrylic board, is applied certain pressure and is carried out smooth sizing.
Preferably, (b) time of immersion described in step is 5-10min.
Preferably, (b) electrolyte described in step is that lithium battery often uses liquid electrolyte, in order to adsorb more electrolyte,
Further preferred electrolyte is saturated solution of the lithium hexafluoro phosphate in carbonate based organic solvent.
Polyacrylonitrile (PAN) and polymetylmethacrylate of the present invention can be using commercially available conventional poly- third
Alkene nitrile PAN and polymetylmethacrylate；For the ease of the dissolution of polymethyl methacrylate, polymethylacrylic acid is selected
Methyl esters micro mist, the state coexisted in spinning solution for swelling and dissolution.
Fiber internal layer of the present invention uses linear polymer, keeps linear polymer spontaneous by heat treatment after adsorbing electrolyte
It shrinks, electrolyte is fixed on inside dielectric film.
The spinning is using conventional solution-polymerized SBR.(a) each solution flow velocity compares in step solution spinning process
Key, shell solution flow velocity is greater than core solution flow velocity in coaxial spinning process, so that it is thicker to form the fiber of spinning
Shell structure, the polymer film that spinning is formed are presented a large amount of holes after hot-stretch solidifies rapidly, pass through heat after adsorbing electrolyte
Processing makes linear polymer Spontaneous Contraction, to make filament contraction, electrolyte is fixed on inside dielectric film, many experiments hair
Each solution flow velocity in existing solution spinning process, polymetylmethacrylate: linear polymer: the flow velocity of polyacrylonitrile (PAN)
Effect is more excellent when than for 1.3~1.6:1.1~1.2:0.8~1.0, and obtained dielectric film performance is good.
The present invention second purpose to be achieved is to provide a kind of dielectric film for inhibiting solid state lithium battery lithium dendrite growth,
A kind of dielectric film inhibiting solid state lithium battery lithium dendrite growth is prepared by above-mentioned preparation method.
By the present invention in that being matched respectively with polyacrylonitrile (PAN) and polymethyl methacrylate (PMMA), linear polymer
It is made as spinning solution, coaxial spinning is carried out as raw material, heat treatment drawing is carried out to the membrane material for being formed in receiver board during the spinning process
It stretches, membrane material is placed in lithium-ion battery electrolytes impregnates later, finally by the membrane material after immersion by rear cooling and solidifying rapidly
It is placed in and is heat-treated, obtain required solid electrolyte film.Fiber in the solid electrolyte film is PMMA/ linear polymerization
Object/PAN multi-layer core-shell structure fiber, each solution flow velocity PMMA > linear polymer > PAN in the solution spinning process, institute
Stating linear polymer is polyolefins, and the electrolyte is that lithium battery often uses liquid electrolyte, is needed in the heat treatment process
Membrane material is carried out shaping using acrylic board.During the preparation process due in spinning process shell solution flow velocity be greater than core solution
Flow velocity, so that the fiber of spinning be made to form thicker shell, the polymer film that spinning is formed is in after the rapid chilling solidification of hot-stretch
Now a large amount of holes make linear polymer Spontaneous Contraction by heat treatment after adsorbing electrolyte, electrolyte are fixed on electrolyte
Inside film.There is following significant advantage using the dielectric film that method of the invention is prepared:
The utility model has the advantages that
1, the present invention is by the fiber of design special construction, and the PMMA on surface layer and lithium metal compatibility are preferable after spinning forms a film, in
The linear polymer of interbed mechanical strength with higher after shrinking, the PAN of internal layer can effectively improve lithium ion conduction energy
Power, this multi-layer core-shell structure efficiently solve PMMA poor mechanical property be difficult to inhibit lithium dendrite growth and PAN to lithium metal not
Stable disadvantage, while the more uniform densification in surface can be made by surface shrinkage, more effectively prevent the leakage of electrolyte.
2, electrolyte network absorption electrolyte prepared by the present invention is stablized, and lithium ion conduction ability is excellent.
Detailed description of the invention
Attached drawing 1: rear surface lithium dendrite arm shape appearance figure is recycled in the dielectric film that embodiment 1 obtains；Smooth surface, without bright
Aobvious lithium dendrite arm.
Attached drawing 2: rear surface lithium dendrite arm shape appearance figure is recycled in the dielectric film that comparative example 2 obtains；Surface has coarse lithium brilliant
Branch distributed point.
Specific embodiment
In the following, the present invention will be further described in detail by way of specific embodiments, but this should not be interpreted as to the present invention
Range be only limitted to example below.Without departing from the idea of the above method of the present invention, according to ordinary skill
The various replacements or change that knowledge and customary means are made, should be included in the scope of the present invention.
Embodiment 1
(a) using polyacrylonitrile (PAN) and polymetylmethacrylate, linear polymer prepare respectively spinning solution carry out it is wet
The coaxial spinning of method, spinning fineness are controlled in 450-500nm, quick under 120 DEG C of constant temperature to the membrane material of formation during the spinning process
3 times are stretched, is then cooled and solidified rapidly in liquid nitrogen atmosphere, the good micropore of film surface is kept；The spinning that the polyacrylonitrile is prepared
Liquid is the spinning solution for being 15% as the mass concentration of solvent using dimethyl sulfoxide；The linear polymer spinning solution is with dimethyl
Sulfoxide is the linear polyethylene LLDPE7042 spinning solution that the mass concentration of solvent is 17%；The polymethyl methacrylate is prepared
Spinning solution be polymethyl methacrylate micro mist dispersion be swollen the spinning that lysigenous mass concentration is 18% in acetone
Liquid；The polymethyl methacrylate spinning solution, linear polymer spinning solution, polyacryl-nitrile spinning fluid flow velocity be respectively
16mL/min, 12mL/min and 10mL/min；The coaxial spinning be followed successively by from the outer to the inner polymethyl methacrylate,
Linear polymer, polyacrylonitrile.
(b) (a) step membrane material is placed in the lithium hexafluoro phosphate carbonic ester electrolyte of saturation after and carries out immersion 5min；
(c) membrane material after finally impregnates (b) step is taken out, and drains, is placed between two panels acrylic board naturally, applies 0.01MPa
Pressure handle 15min at 80 DEG C, make the smooth sizing of membrane material, obtain the solid electrolyte film with a thickness of 50 μm.
Dielectric film is prepared into test battery after 300 times recycle to dismantle and see electrolytic film, negative electrode tab film surface keeps smooth,
Without obvious lithium dendrite arm, as shown in Figure 1.
Embodiment 2
(a) using polyacrylonitrile (PAN) and polymetylmethacrylate, linear polymer prepare respectively spinning solution carry out it is wet
The coaxial spinning of method, spinning fineness are controlled in 450-500nm, quick under 120 DEG C of constant temperature to the membrane material of formation during the spinning process
4 times are stretched, is then cooled and solidified rapidly in liquid nitrogen atmosphere, the good micropore of film surface is kept；The spinning that the polyacrylonitrile is prepared
Liquid is the spinning solution for being 15% as the mass concentration of solvent using dimethyl sulfoxide；The linear polymer spinning solution is with dimethyl
Sulfoxide is the linear polyethylene LLDPE7042 spinning solution that the mass concentration of solvent is 17%；The polymethyl methacrylate is prepared
Spinning solution be polymethyl methacrylate micro mist dispersion be swollen the spinning that lysigenous mass concentration is 18% in acetone
Liquid；The polymethyl methacrylate spinning solution, linear polymer spinning solution, polyacryl-nitrile spinning fluid flow velocity be respectively
14mL/min, 11mL/min and 10mL/min；The coaxial spinning be followed successively by from the outer to the inner polymethyl methacrylate,
Linear polymer, polyacrylonitrile.
(b) (a) step membrane material is placed in the lithium hexafluoro phosphate carbonic ester electrolyte of saturation after and carries out immersion 5min；
(c) membrane material after finally impregnates (b) step is taken out, and drains, is placed between two panels acrylic board naturally, applies 0.01MPa
Pressure handle 15min at 80 DEG C, make the smooth sizing of membrane material, obtain the solid electrolyte film with a thickness of 50 μm.
Comparative example 1
(a) prepares spinning solution using polyacrylonitrile (PAN) and polymetylmethacrylate respectively and carries out the coaxial spinning of wet process,
Spinning fineness control in 450-500nm, during the spinning process to the membrane material of formation under 120 DEG C of constant temperature 3 times of Rapid stretching, then
It is cooled and solidified rapidly in liquid nitrogen atmosphere, keeps the good micropore of film surface；The spinning solution that the polyacrylonitrile is prepared is with dimethyl
Sulfoxide is the spinning solution that the mass concentration of solvent is 15%；The spinning solution that the polymethyl methacrylate is prepared is poly- methyl-prop
The dispersion of e pioic acid methyl ester micro mist is swollen the spinning solution that lysigenous mass concentration is 18% in acetone；It is each in the spinning process
Spinning flow velocity 16mL/min, 10mL/min；The coaxial spinning be followed successively by from the outer to the inner polymethyl methacrylate,
Polyacrylonitrile.
(b) (a) step membrane material is placed in the lithium hexafluoro phosphate carbonic ester electrolyte of saturation after and carries out immersion 5min；
(c) membrane material after finally impregnates (b) step is taken out, and drains, is placed between two panels acrylic board naturally, applies 0.01MPa
Pressure handle 15min at 80 DEG C, make the smooth sizing of membrane material, obtain the solid electrolyte film with a thickness of 50 μm.
In spinning fibre linear polymer is not arranged in middle layer, the fibre in subsequent thermal finalization in film in comparative example 1
It is poor to tie up self-constriction, influences further to influence conductivity to the stabilizing network of electrolyte.
Comparative example 2
(a) using polyacrylonitrile (PAN) and polymetylmethacrylate, linear polymer prepare respectively spinning solution carry out it is wet
The coaxial spinning of method, spinning fineness are controlled in 450-500nm, quick under 120 DEG C of constant temperature to the membrane material of formation during the spinning process
4 times are stretched, is then cooled and solidified rapidly in liquid nitrogen atmosphere, the good micropore of film surface is kept；The spinning that the polyacrylonitrile is prepared
Liquid is the spinning solution for being 15% as the mass concentration of solvent using dimethyl sulfoxide；The linear polymer spinning solution is with dimethyl
Sulfoxide is the linear polyethylene LLDPE7042 spinning solution that the mass concentration of solvent is 17%；The polymethyl methacrylate is prepared
Spinning solution be polymethyl methacrylate micro mist dispersion be swollen the spinning that lysigenous mass concentration is 18% in acetone
Liquid；The polymethyl methacrylate spinning solution, linear polymer spinning solution, polyacryl-nitrile spinning fluid flow velocity be respectively 6mL/
Min, 12mL/min and 10mL/min；The coaxial spinning is to be followed successively by polymethyl methacrylate, linear from the outer to the inner
Polymer, polyacrylonitrile.
(b) (a) step membrane material is placed in the lithium hexafluoro phosphate carbonic ester electrolyte of saturation after and carries out immersion 5min；
(c) membrane material after finally impregnates (b) step is taken out, and drains, is placed between two panels acrylic board naturally, applies 0.01MPa
Pressure handle 15min at 80 DEG C, make the smooth sizing of membrane material, obtain the solid electrolyte film with a thickness of 50 μm.
For comparative example 2 in spinning fibre, outer layer polymethyl methacrylate supply is less, influences to the affine of electrolyte
Adsorbance has lacked the affine absorption of polymethyl methacrylate, and electrolyte is poor by the stability of network, is easy leakage, shadow
Ring circulating battery stability；Test battery is prepared into dismantle after 300 times recycle and see electrolytic film, lithium dendrite arm occurs in negative electrode tab, such as
Shown in Fig. 2.
Performance test is compared:
Test the conductivity of each sample dielectric film
The conductivity of solid electrolyte film is measured using AC impedence method.Such as table 1.
Mechanical property
It is carried out on Zwick/Roell Z020 universal testing machine, rate of extension 20mm/min.5 samples are cut, are tested
Average tensile strength.Such as table 1.
Battery performance test
The production of positive plate: the acetylene black of 850gLiFePO4,50g, 100g Kynoar are dispersed in -2 pyrrolidines of N- methyl
Ketone high speed dispersion prepares slurry, and blade coating is dried to obtain positive plate on aluminium foil.
The production of negative electrode tab: 900g powdered graphite, 20g conductive black, 80g Kynoar are dispersed in -2 pyrrole of N- methyl
Pyrrolidone high speed dispersion prepares slurry, coated on 10 μm of thickness of copper foils, is dried to obtain negative electrode tab.
Test the production of battery: by positive plate, the dielectric film dielectric film of preparation (embodiment 1-2, comparative example 1-2),
The close roll-in fitting of negative electrode tab, connects positive and negative tab, for testing battery.
Battery testing method:
Test the capacity retention ratio that 0.5C recycles 300 times；And dismantle the battery after recycling 300 times, observe the lithium in negative electrode tab
Dendrite situation.Such as table 1.
Table 1
Claims (8)
1. a kind of preparation method for the dielectric film for inhibiting solid state lithium battery lithium dendrite growth, which is characterized in that specific steps are such as
Under:
(a) using polyacrylonitrile (PAN) and polymetylmethacrylate, linear polymer prepare respectively spinning solution carry out it is wet
The coaxial spinning of method cools and solidifies rapidly after carrying out heat treatment stretching to the membrane material of formation during the spinning process；The polyacrylonitrile
The spinning solution of preparation is the spinning solution for being 15% as the mass concentration of solvent using dimethyl sulfoxide；The linear polymer spinning solution
For the linear polyethylene spinning solution for being 17% as the mass concentration of solvent using dimethyl sulfoxide；The polymethyl methacrylate is matched
The spinning solution of system is that the dispersion of polymethyl methacrylate micro mist is swollen the spinning that lysigenous mass concentration is 18% in acetone
Liquid；Each spinning flow velocity PMMA > linear polymer > PAN in the spinning process；The coaxial spinning is from the outer to the inner
It is followed successively by polymethyl methacrylate, linear polymer, polyacrylonitrile；
(b) membrane material that (a) step is prepared is placed in lithium-ion battery electrolytes after and is impregnated；
(c) membrane material after finally impregnates (b) step is placed in 14.5~15.5min of processing at 80~90 DEG C, obtains required consolidate
Body dielectric film.
2. a kind of preparation method of dielectric film for inhibiting solid state lithium battery lithium dendrite growth according to claim 1,
Be characterized in that, each solution flow velocity PMMA in solution spinning process described in (a) step: linear polymer: PAN is 1.3~1.6:1.1
~1.2:0.8~1.0.
3. a kind of preparation method of dielectric film for inhibiting solid state lithium battery lithium dendrite growth according to claim 1,
Be characterized in that, each solution flow velocity PMMA in solution spinning process described in (a) step: linear polymer: PAN is 1.4~1.5:1.1
~1.2:0.9~1.0.
4. a kind of preparation method of dielectric film for inhibiting solid state lithium battery lithium dendrite growth according to claim 1,
It is characterized in that, membrane material described in (a) step carries out heat treatment stretching, and the membrane material formed in receiver board is specifically warming up to 120 DEG C
It stretches, stretching ratio is controlled at 3-5 times.
5. a kind of preparation method of dielectric film for inhibiting solid state lithium battery lithium dendrite growth according to claim 1,
It is characterized in that, smooth pressed sizing is carried out to membrane material using acrylic board in heat treatment process described in (a) step.
6. a kind of preparation method of dielectric film for inhibiting solid state lithium battery lithium dendrite growth according to claim 1,
It is characterized in that, (b) time of immersion described in step is 5-10min.
7. a kind of preparation method of dielectric film for inhibiting solid state lithium battery lithium dendrite growth according to claim 1,
It is characterized in that, (b) electrolyte described in step is that lithium battery often uses liquid electrolyte, and the electrolyte is lithium hexafluoro phosphate in carbonic acid
Saturated solution in based organic solvent.
8. a kind of dielectric film for inhibiting solid state lithium battery lithium dendrite growth, which is characterized in that a kind of inhibition solid-state lithium electricity
The dielectric film of pond lithium dendrite growth is prepared by the described in any item preparation methods of claim 1~7.
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