CN104140502B - A kind of lithium ion battery separator binding agent, preparation method and use the barrier film of this binding agent - Google Patents
A kind of lithium ion battery separator binding agent, preparation method and use the barrier film of this binding agent Download PDFInfo
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- CN104140502B CN104140502B CN201310571644.1A CN201310571644A CN104140502B CN 104140502 B CN104140502 B CN 104140502B CN 201310571644 A CN201310571644 A CN 201310571644A CN 104140502 B CN104140502 B CN 104140502B
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- 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 invention discloses a kind of lithium ion battery separator binding agent, preparation method and use the barrier film of this binding agent, this binding agent comprises the raw material of following parts by weight: water-soluble polymer 0.5～1 part, soft segment monomer 1～10 parts, rigid chain segment monomer 1～10 parts, initiator 0.01～0.05 part, plasticizer 1～10 parts.The lithium ion battery separator binding agent of the present invention, the coating material of lithium ion battery separator it is used as with inorganic matter after mixing, improve heat stability and the heat resistanceheat resistant shrinkage of barrier film, thus solve that existing lithium ion battery separator causes due to poor heat stability be susceptible to internal short-circuit problem, make barrier film have good safety and overcharging resisting performance；Meanwhile, binding agent contains polar group, with inorganic matter close adhesion, improves the wettability of barrier film and protects fluidity；While there is rigid chain segment, introduce soft segment, thus improve its mechanical property, it is ensured that its cohesive force and the pliability of barrier film.
Description
Technical field
The invention belongs to lithium ion battery separator technical field, be specifically related to a kind of lithium ion battery separator binding agent, simultaneously
Further relate to the preparation method of a kind of lithium ion battery separator binding agent and use the barrier film of this binding agent.
Background technology
Lithium ion battery, owing to having higher specific energy density, has become as the focus of current electrochemical industry research.At this
The negative electrode of class battery, includes the transition metal oxides such as manganese, cobalt, vanadium or nickel, can according to simplest stoichiometry situation
It is described as LiMn2O4、LiCoO2、LiV2O5Or LiNiO2, also include quickly grew in recent years ferrum, manganese, cobalt, vanadium
Or transition metal phosphate, the silicate etc. such as nickel.These compounds with can be incorporated in lattice lithium ion compound (as
Graphite) there is reversible reaction, from lattice, remove lithium ion；Ferrum manganese cobalt nickel is oxidized in the process, and this reaction can be applied
In order to store electric energy in chemical cell.Wherein, will can accept the compound (anode material) of lithium ion with electrolyte and contain
The compound (cathode material) of lithium is separated from each other, and the lithium ion of lithium-containing compound is by electrolyte to anode material.
During battery charging, along with lithium ion is flowed to the moon by external circuit by anode to anode, electronics by cathode system through electrolyte
Pole.For avoiding chemical cell that short circuit occurs, need to place the material that there is insulating properties and allow lithium ion to pass through between anode and cathode,
Here it is so-called battery diaphragm.
Battery diaphragm refers to one layer of thin porous material between anode and negative pole, is portion the most crucial in battery
Point, safety and cost to battery have a direct impact.Battery diaphragm should have the mechanical strength that macroion permeability is become reconciled,
And chemical substance used by system (such as the electrolyte of battery) and solvent are had long-time stability.In the battery, barrier film must
Negative electrode and anode electrode must be made completely isolated, but make electrolyte pass through simultaneously；Must have lasting elasticity, and in charging
With in discharge process, follow system (such as electrode assemblie) mobile.
Battery diaphragm is the key factor determining lithium ion battery service life, therefore, the development of lithium ion battery receive every
The impact of membrane material development.At present, traditional battery diaphragm is mainly the organic polymer films of porous.Typical organic polymer
Thing film is microporous polyolefin film, such as polyethene microporous membrane, microporous polypropylene membrane.The chemical composition of polyolefin self, structure with
And moulding process, determine its process based prediction model, cause it and have one in lithium-ion power battery dissepiment application aspect
A little defects.
The problem that microporous polyolefin film is primarily present for battery diaphragm has: (1) polyolefin is as non-polar material, and by force
The electrolyte affinity of polarity is poor, causes its liquid-keeping property poor；(2) microporous polyolefin film many employings mechanical stretching pore
Or organic solvent extraction pore after mechanical stretching, then prepared by thermal finalization, this preparation method causes microporous polyolefin film to have
Shape memory effect: when temperature is higher, barrier film trends towards recovering the shape of stretching cephacoria, causes bigger thermal contraction；(3)
Polyolefinic fusion temperature is relatively low, and base material easily produces fusing when temperature is more than 165 DEG C, makes micropore disappear, and blocks ion and passes
Lead (the most so-called hot blackout effect)；When there is fusing due to microporous polyolefin film, also along with volume contraction, membrane area
Reduce, make barrier film lose the iris action between both positive and negative polarity, thus cause inside battery both positive and negative polarity to be short-circuited, cause battery
Burning is even exploded, and produces potential safety hazard.
The safety how improving lithium ion battery is the important topic of the industry, is also an extremely urgent key problem in technology difficult problem.
The main cause causing lithium ion battery generation potential safety hazard is the heat mistake that battery occurs irreversible electrochemistry side reaction to produce
Control is caused.Therefore, the heat stability improving barrier film is the important leverage of lithium ion battery security.
Summary of the invention
It is an object of the invention to provide a kind of lithium ion battery separator binding agent, it mixes with inorganic matter as barrier film coating,
Solve that existing lithium ion battery separator causes due to poor heat stability is susceptible to internal short-circuit problem.
Second object of the present invention is to provide the preparation method of a kind of lithium ion battery separator binding agent.
Third object of the present invention is to provide a kind of lithium ion battery separator using above-mentioned binding agent.
In order to realize object above, the technical solution adopted in the present invention is: a kind of lithium ion battery separator binding agent, bag
Raw material containing following parts by weight: water-soluble polymer 0.5～1 part, soft segment monomer 1～10 parts, rigid chain segment monomer
1～10 part, initiator 0.01～0.05 part, plasticizer 1～10 parts, deionized water or distilled water 10 parts.
Described water-soluble polymer is poly(ethylene oxide) (PEO), polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP)
In any one or a combination thereof.
Described soft segment monomer is acrylic acid fourth diester, methacrylic acid diethylene glycol dimethyl ether ester, vinylacetate, ethylene
Any one or a few in-vinylacetate；Described rigid chain segment monomer is acrylonitrile, styrene, Nomex, poly-connection
Any one or a few in benzene.
Described initiator is any one or two kinds in hydrogen peroxide, Ammonium persulfate., potassium peroxydisulfate.
Described plasticizer is adipate ester, azelate, SA ester, phosphate ester fatty alcohol, triacetin, a contracting
The own ester of diethylene glycol benzoate, trioctyl trimellitate (TOTM), tri trimellitate, triethyl citrate, diethyl carbonate, third
Acid tributyl, triethyl phosphate, tributyl citrate, epoxyoleic acid butyl ester, glycol phthalate, chlorinated paraffin
In any one or a combination thereof.
The preparation method of a kind of above-mentioned lithium ion battery separator binding agent, comprises the following steps:
1) water-soluble polymer taking 0.5～1 weight portion is placed in deionized water or the distilled water of 10 weight portions, is warming up to
50～100 DEG C, stirring makes it be completely dissolved, and obtains solution A；
2) the rigid chain segment monomer of the soft segment monomer and 1～10 weight portions that take 1～10 weight portions is sequentially added into step 1)
In gained solution A, under inert gas shielding, add the initiator of 0.01～0.05 weight portion, at 50～100 DEG C of bars
Under part, stirring carries out polyreaction, and the response time is 5～12h, obtains emulsion after reaction；
3) to step 2) gained emulsion is stirred, and add the plasticizer of 1～10 weight portions and stir, to obtain final product.
A kind of lithium ion battery separator using above-mentioned binding agent, it is characterised in that: include basement membrane, the one side of described basement membrane
Or coated on both sides has coating, described coating to be the mixture of inorganic matter and binding agent, in described mixture, the weight of binding agent
Mark is 1%～99%.
Described inorganic matter be main group I in the periodic table of elements, II, III, IV, the oxide of transition state IV race metal, nitrate,
In sulfate, silicate, carbonate, phosphate, nitride, amide, imide, carbide any one or
A combination thereof；Described inorganic matter is graininess, and granularity is 0.1～10 μm.
Described basement membrane is polyolefin film, polyethylene terephthalate (PET) film, polystyrene (PS) film, polyamides
Any one monofilm in amine (PA) film, polyacrylonitrile (PAN) film, polyimides (PI) film or several being combined
Multilayer film；The thickness of described basement membrane is 15～30 μm.
Described basement membrane had carried out pretreatment before applying coating, and described pretreatment is at corona, Cement Composite Treated by Plasma, illumination
Other common barrier film preprocess methods such as reason, high-energy radiation process.
Described coating can by printing, be coated with, adsorbing, roll-in, impregnate, spray or topple over by the way of basement membrane one side or
Prepared by two sides.
The lithium ion battery separator binding agent of the present invention, uses water-soluble polymer and by soft segment monomer, rigid chain segment
The polymer that monomer copolymerization generates compounds, and is aided with plasticizer, and gained binding agent is used as barrier film with the mixture of inorganic matter
Coating, have the advantages that
1) coating that gained binding agent and inorganic matter are mixed to form, has good resistance to elevated temperatures, makes barrier film ensure heat
On the basis of blackout effect, there is high-fire resistance energy；Improve heat stability and the heat resistanceheat resistant shrinkage of barrier film, thus solve existing
Have what lithium ion battery separator caused due to poor heat stability to be susceptible to internal short-circuit problem, make barrier film have good resistance to
Over-charging；
2) gained binding agent contains polar group (-CN-,-OH-,-O-etc.), can be with inorganic matter close adhesion, and can quilt
Electrolyte soaks rapidly, improves the wettability of barrier film and protects fluidity, makes barrier film keep wetting state；The swelling ratio making barrier film is low
In 1%, dimensional stability is more preferable, it is ensured that battery production is more efficient；
3) gained binding agent and polymer microporous film close adhesion, thus ensure that the tight of inorganic matter and polymer microporous film
Bonding；Make basement membrane with coating bonding closely, it is to avoid shedding phenomenon to occur during vibrating, being bending or folding over, ensures electricity
The uniformity of electric current in the charge and discharge process of pond；
4) bonding force between thin film depends on the molecular structure of binding agent, and the polarity of molecule is bigger, and cementability is stronger, but with
Time, intermolecular active force is the strongest, and the rotation difficulty of strand strengthens, and distortional ability declines, and the elasticity of barrier film will decline,
Film forming rear film can be caused harder；The binding agent of the present invention introduces soft segment while having rigid chain segment, thus improves
Its mechanical property, it is ensured that while its cohesive force, improves again its pliability, thus ensures the pliability of barrier film.
5) gained binding agent contains polar group, and they can be scattered in soft segment by hydrogen bond association together, rises
Arrive physical crosslinking to put and the effect of active-reinforcing fillers, thus the mechanical strength of enhanced film and safety；
6) gained binding agent is in barrier film drying course, without unwanted volatile；Whole production process safety and environmental protection, does not has " three
Useless " discharge, the most there is not burning, explode and the potential safety hazard such as poisoning.
The lithium ion battery separator using above-mentioned binding agent of the present invention, uses the mixture conduct of described binding agent and inorganic matter
Coating material, has good high heat resistance performance, improves the heat resistanceheat resistant shrinkage of barrier film；Ensure barrier film when temperature is higher or
At piercing orientation (short circuit current flow through and cause heat up), internal short-circuit problem will not be caused because there is fusing, improve every
The heat stability of film, thus while meeting the requirement of safety cut-off mechanism, greatly improve the safety of lithium ion battery
With overcharging resisting performance, meet the use requirement of high-power battery.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further illustrated.
Embodiment 1
The lithium ion battery separator binding agent of the present embodiment, comprises the raw material of following weight: poly(ethylene oxide) 1g, acrylonitrile
1g, acrylic acid fourth diester 2g, potassium peroxydisulfate 0.02g, epoxyoleic acid butyl ester 10g, deionized water 10g.
The preparation method of the lithium ion battery separator binding agent of the present embodiment, comprises the following steps:
1) poly(ethylene oxide) taking 1g is placed in the deionized water of 10g, is warming up to 100 DEG C, and stirring makes it be completely dissolved,
Obtain solution A；
2) after step 1) gained solution A is lowered the temperature, acrylonitrile (rigid chain segment monomer) and the acrylic acid fourth of 2g of 1g are taken
Diester (soft segment monomer) is sequentially added in solution A, and under nitrogen protection, the potassium peroxydisulfate adding 0.02g causes
Polymerization, under the conditions of 100 DEG C, stirring carries out polyreaction, and the response time is 6h, obtains white emulsion after reaction；
3) to step 2) gained emulsion is stirred, and adds the epoxyoleic acid butyl ester of 10g and stirs, and obtains described
Binding agent.
The lithium ion battery separator using above-mentioned binding agent of the present embodiment, it is characterised in that: include basement membrane, described basement membrane
One side is coated with coating, and described coating is the mixture of titanium dioxide and binding agent.
The preparation method of above-mentioned lithium ion battery separator, comprises the following steps:
A) taking the surface-treated titania powder of 1g, be added in described binding agent, temperature controls at 100 DEG C so that it is
Generate colloidal sol completely, thus obtain mixture colloidal sol；
B) microporous polypropylene membrane that thickness is 25 μm being carried out corona pre-treatment, machine walking speed is 30m/min, corona discharge power
For 500w, corona voltage 2kV, thus prepare basement membrane；
C) coated for mixture colloidal sol machine is coated in the one side of the preprocessed mistake of basement membrane, controls single spreading layer thickness 4 μm
Left and right, obtains wet thin-film material；
D) being transferred in vacuum drying oven by thin-film material wet for gained, keeping baking temperature is 90 DEG C, is dried 6h, obtains
Thickness is the composite modified porous polyolefin film of the lithium ion battery separator made of 29 μm.
Embodiment 2
The lithium ion battery separator binding agent of the present embodiment, comprises the raw material of following weight: polyvinyl alcohol 1g, acrylonitrile
1g, methacrylic acid diethylene glycol dimethyl ether ester 2g, Ammonium persulfate. 0.01g, triethyl phosphate 10g, deionized water 10g.
The preparation method of the lithium ion battery separator binding agent of the present embodiment, comprises the following steps:
1) polyvinyl alcohol taking 1g is placed in the deionized water of 10g, is warming up to 70 DEG C, and stirring makes it be completely dissolved, and obtains molten
Liquid A；
2) after step 1) gained solution A is lowered the temperature, acrylonitrile (rigid chain segment monomer) and the metering system of 2g of 1g are taken
Acid diethylene glycol methyl ether ester (soft segment monomer) is sequentially added in solution A, under nitrogen protection, adds 0.01g's
Ammonium persulfate. causes polymerization, and under the conditions of 70 DEG C, stirring carries out polyreaction, and the response time is 10h, obtains white after reaction
Emulsion；
3) to step 2) gained emulsion is stirred, and adds the triethyl phosphate of 10g and stirs, and obtains described viscous
Knot agent.
The lithium ion battery separator using above-mentioned binding agent of the present embodiment, it is characterised in that: include basement membrane, described basement membrane
One side is coated with coating, and described coating is the mixture of zirconium dioxide and binding agent.
The preparation method of above-mentioned lithium ion battery separator, comprises the following steps:
A) taking the surface-treated Zirconium dioxide powder of 1g, be dispersed in described binding agent, temperature controls at 70 DEG C so that it is
Generate colloidal sol completely, thus obtain mixture colloidal sol；
B) polyethene microporous membrane that thickness is 20 μm being carried out corona pre-treatment, machine walking speed is 30m/min, corona discharge power
For 500w, corona voltage 10kV, thus prepare basement membrane；
C) coated for mixture colloidal sol machine is coated in the one side of the preprocessed mistake of basement membrane, controls single spreading layer thickness 4 μm
Left and right, obtains wet thin-film material；
D) being transferred in vacuum drying oven by thin-film material wet for gained, keeping baking temperature is 50 DEG C, is dried 10h,
Composite modified porous polyolefin film to the lithium ion battery separator made that thickness is 24 μm.
Embodiment 3
The lithium ion battery separator binding agent of the present embodiment, comprises the raw material of following weight: polyvinyl pyrrolidone 0.5g,
Vinylacetate 2g, styrene 1g, potassium peroxydisulfate 0.01g, diglycol benzoate 10g, deionized water 10g.
The preparation method of the lithium ion battery separator binding agent of the present embodiment, comprises the following steps:
1) polyvinyl pyrrolidone taking 1g is placed in the deionized water of 10g, is warming up to 90 DEG C, and stirring makes it the most molten
Solve, obtain solution A；
2) after step 1) gained solution A is lowered the temperature, vinylacetate (soft segment monomer) and the benzene second of 1g of 2g are taken
Alkene (rigid chain segment monomer) is sequentially added in solution A, and under nitrogen protection, the potassium peroxydisulfate adding 0.01g causes poly-
Closing, under the conditions of 70 DEG C, stirring carries out polyreaction, and the response time is 10h, obtains white emulsion after reaction；
3) to step 2) gained emulsion is stirred, and add the diglycol benzoate of 10g and stir,
Obtain described binding agent.
The lithium ion battery separator using above-mentioned binding agent of the present embodiment, it is characterised in that: include basement membrane, described basement membrane
One side is coated with coating, and described coating is the mixture of zirconium dioxide and binding agent.
The preparation method of above-mentioned lithium ion battery separator, comprises the following steps:
A) taking aluminium sesquioxide powder surface-treated for 1g, be dispersed in described binding agent, temperature controls at 100 DEG C,
Make it generate colloidal sol completely, thus obtain mixture colloidal sol；
B) microporous polypropylene membrane that thickness is 25 μm being carried out corona pre-treatment, machine walking speed is 30m/min, corona discharge power
For 500w, corona voltage 6kV, thus prepare basement membrane；
C) coated for mixture colloidal sol machine is coated in the one side of the preprocessed mistake of basement membrane, controls single spreading layer thickness 5 μm
Left and right, obtains wet thin-film material；
D) being transferred in vacuum drying oven by thin-film material wet for gained, keeping baking temperature is 80 DEG C, is dried 7h, obtains
Thickness is the composite modified porous polyolefin film of the lithium ion battery separator made of 30 μm.
Experimental example 1
The composite modified thin film of this experimental example Example 1～3 gained, as lithium ion battery separator, tests it respectively certainly
By the thermal contraction performance under state.In comparative example, PP, PE thickness is respectively about 25 μm, 20 μm.Experimental result such as table
Shown in 1.
Test method: barrier film sample is cut into the sample of 120mm × 120mm, draws along opposite side center line
The perpendicular bisector of 100mm × 100mm；Barrier film is placed in each temperature spot lower 2 hours, after baking oven taken out by sample, at laboratory ring
Measure again after 10min is placed in border；Length L of perpendicular bisector after measurement thermal contractionfAnd Wf, under the conditions of calculating this
Operating direction (the β of barrier filmMD) and horizontal (βTD) shrinkage factor；Parallel testing 3 times, takes arithmetic mean of instantaneous value.Computing formula
As follows:
The thermal contraction performance test result of table 1 embodiment 1～3 gained barrier film
As it can be seen from table 1 more traditional simple PP, PE film of embodiment 1～3 gained barrier film has more preferable temperature characterisitic；
Solve the big problem that conventional membrane is at high temperature shunk, improve the integrity of high temperature lower diaphragm plate, battery security is carried
Height has the meaning of key.
Experimental example 2
The composite modified thin film of this experimental example Example 1,2,3 gained, as lithium ion battery separator, tests its stripping respectively
From intensity.Experimental result is as shown in table 2.
Test method: intercept wide 25mm, long 180mm sample along barrier film operating direction (MD)；Sample is had coating one
Face adheres on steel bar, light pressure viscosity junction, and effective binding length is 60mm.Requirement adhesive surface is smooth, and dynamics is uniform.Will
Sample one end and steel bar one end are fixed on universal testing machine, and draw speed is 100mm/min.This project parallel testing 3 times,
Take arithmetic mean of instantaneous value.
The peel strength test result of table 2 embodiment 1～3 gained barrier film
| Embodiment 1 | Embodiment 2 | Embodiment 3 | |
| Peel strength, N/m | 123 | 159 | 147 |
From table 2 it can be seen that between coating and the basement membrane of embodiment 1～3 gained barrier film bonding is closely, it is to avoid vibration,
During being bending or folding over, shedding phenomenon occurs, the uniformity of electric current in battery charge and discharge process can be ensured.
Experimental example 3
The composite modified thin film of this experimental example Example 1,2,3 gained, as lithium ion battery separator, tests it saturating respectively
Gas.Experimental result is as shown in table 3.
Test method: use Gurley test instrunment to measure the breathability (Gurley number) of barrier film.Gurley number refers to necessarily
The test gas of amount passes through 1in. under 1.22KPa pressure2Sample required for time, unit: second (s).In this survey
In examination, using Gurley instrument (model: Gurley4110N) test gas is air, and the amount of gas is 100mL, test
Time need to be with stopwatch simultaneously timing.This project parallel testing 3 times, takes arithmetic mean of instantaneous value.
The breathability test result of table 3 embodiment 1～3 gained barrier film
| Embodiment 1 | Embodiment 2 | Embodiment 3 | |
| Basement membrane thickness, μm | 25 | 20 | 25 |
| Basement membrane air penetrability, sec/100ml | 432 | 484 | 432 |
| Finished product thickness, μm | 29 | 24 | 30 |
| Finished product air penetrability, sec/100ml | 481 | 535 | 498 |
From table 3 it can be seen that the laminated film obtained by embodiment 1～3, thickness often increases by 1 μm, and air permeability values is only
Increase about 13 seconds, the conductivity of barrier film is affected and little.
Claims (9)
1. a lithium ion battery separator binding agent, it is characterised in that: it is made up of the raw material of following parts by weight: water-soluble polymer 0.5～1 part, soft segment monomer 1～10 parts, rigid chain segment monomer 1～10 parts, initiator 0.01～0.05 part, plasticizer 1～10 parts, deionized water or distilled water 10 parts；This binding agent is to be prepared by the method comprised the following steps:
1) water-soluble polymer taking 0.5～1 weight portion is placed in deionized water or the distilled water of 10 weight portions, is warming up to 50～100 DEG C, and stirring makes it be completely dissolved, and obtains solution A；
2) the rigid chain segment monomer of the soft segment monomer and 1～10 weight portions that take 1～10 weight portions is sequentially added into step 1) in gained solution A; under inert gas shielding; add the initiator of 0.01～0.05 weight portion; under the conditions of 50～100 DEG C; stirring carries out polyreaction; response time is 5～12h, obtains emulsion after reaction；
3) to step 2) gained emulsion is stirred, and add the plasticizer of 1～10 weight portions and stir, to obtain final product；
Described soft segment monomer is any one or a few in acrylic acid fourth diester, methacrylic acid diethylene glycol dimethyl ether ester, vinylacetate, ethylene-vinyl acetate；Described rigid chain segment monomer is any one or a few in acrylonitrile, styrene, Nomex, poly-biphenyl.
Lithium ion battery separator binding agent the most according to claim 1, it is characterised in that: described water-soluble polymer is any one or a combination thereof in poly(ethylene oxide), polyvinyl alcohol, polyvinylpyrrolidone.
Lithium ion battery separator binding agent the most according to claim 1, it is characterised in that: described initiator is any one or two kinds in hydrogen peroxide, Ammonium persulfate., potassium peroxydisulfate.
Lithium ion battery separator binding agent the most according to claim 1, it is characterised in that: described plasticizer is any one or a combination thereof in adipate ester, azelate, sebacate, phosphate ester fatty alcohol, triacetin, diglycol benzoate, trioctyl trimellitate (TOTM), the own ester of tri trimellitate, triethyl citrate, diethyl carbonate, propanoic acid tributyl, triethyl phosphate, tributyl citrate, epoxyoleic acid butyl ester, glycol phthalate, chlorinated paraffin.
5. the preparation method of a lithium ion battery separator binding agent as claimed in claim 1, it is characterised in that: comprise the following steps:
1) water-soluble polymer taking 0.5～1 weight portion is placed in deionized water or the distilled water of 10 weight portions, is warming up to 50～100 DEG C, and stirring makes it be completely dissolved, and obtains solution A；
2) the rigid chain segment monomer of the soft segment monomer and 1～10 weight portions that take 1～10 weight portions is sequentially added into step 1) in gained solution A; under inert gas shielding; add the initiator of 0.01～0.05 weight portion; under the conditions of 50～100 DEG C; stirring carries out polyreaction; response time is 5～12h, obtains emulsion after reaction；
3) to step 2) gained emulsion is stirred, and add the plasticizer of 1～10 weight portions and stir, to obtain final product.
6. the lithium ion battery separator using binding agent as claimed in claim 1, it is characterized in that: including that basement membrane, the one or both sides of described basement membrane are coated with coating, described coating is the mixture of inorganic matter and binding agent, in described mixture, the weight fraction of binding agent is 1%～99%.
Lithium ion battery separator the most according to claim 6, it is characterised in that: described inorganic matter is any one or a combination thereof in main group I in the periodic table of elements, II, III, IV, the oxide of transition state IV race metal, nitrate, sulfate, silicate, carbonate, phosphate, nitride, amide, imide, carbide；Described inorganic matter is graininess, and granularity is 0.1～10 μm.
Lithium ion battery separator the most according to claim 6, it is characterised in that: described basement membrane is any one monofilm in polyolefin film, polyethylene terephthalate film, polystyrene film, polyamide membrane, polyacrylonitrile film, polyimide film or several composite multilayer membranes；The thickness of described basement membrane is 15～30 μm.
Lithium ion battery separator the most according to claim 8, it is characterised in that: described basement membrane had carried out pretreatment before applying coating, and described pretreatment is that sided corona treatment, Cement Composite Treated by Plasma, photo-irradiation treatment or high-energy radiation process.
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