CN105428578A - Battery production method and fiber diaphragm formed thereby - Google Patents
Battery production method and fiber diaphragm formed thereby Download PDFInfo
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- CN105428578A CN105428578A CN201511000761.8A CN201511000761A CN105428578A CN 105428578 A CN105428578 A CN 105428578A CN 201511000761 A CN201511000761 A CN 201511000761A CN 105428578 A CN105428578 A CN 105428578A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/44—Fibrous material
-
- 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
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a diaphragm and a method for producing a battery with the diaphragm. The battery production method comprises the following steps: coating a first substrate with a positive electrode substance to form a positive electrode; adding a thermoplastic polymer in melt-blowing equipment, turning on the melt-blowing equipment, forming an ultrafine fuse at a nozzle of the melt-blowing equipment with the thermoplastic polymer; placing the positive electrode below the nozzle of the melt-blowing equipment, coating the surface of the positive electrode with the ultrafine fuse, forming the diaphragm on the surface of the positive electrode, coating a second substrate with a negative electrode substance to form a negative electrode, covering the diaphragm of the positive electrode with one surface of the negative electrode coated with the negative substance; wherein a thickness of the diaphragm is 8-350 gsm, porosity is 60-90%, and a fiber diameter is 0.1-30 micrometers. According to the battery production method, the diaphragm between the positive electrode and the negative electrode has the advantages of stable performance, good heat stability and high mechanical strength, and hidden trouble of the battery can be reduced.
Description
Technical field
The present invention relates to battery preparation technology field, be specifically related to the fibre diaphragm of a kind of battery preparation method and formation thereof.
Background technology
Positive and negative electrode can be separated by the barrier film in lithium battery and capacitor, prevents the generation of short circuit.Traditional battery or capacitor use polyolefin (being mainly PP and PE) barrier film, preparation method uses dry method or wet-layer preparation, then be added between positive and negative electrode, this barrier film needs when using to shift tensile membrane, cause harmless membrane aperture, porosity, the change of thickness, causes film properties to change; And this film poor heat stability, horizontal mechanical strength is low, when being applied at lithium ion battery, internal short-circuit occurring at high discharge rates or when being heated by mechanical presses, can cause potential safety hazard.
Summary of the invention
Based on this, be necessary to provide a kind of battery preparation method, the cell safety hidden danger of preparation is less, and stability is high.
The fibre diaphragm that the present invention also provides a kind of above-mentioned battery preparation method to be formed, its stable performance, Heat stability is good, horizontal mechanical strength are high.
In order to realize object of the present invention, the present invention by the following technical solutions:
A kind of battery preparation method, it comprises the steps:
Apply positive electrode material on the first substrate, form anode electrode;
Thermoplastic polymer is added melt-blowing equipment, and open melt-blowing equipment, described thermoplastic polymer is at the ultra-fine fuse of shower nozzle interruption-forming of described melt-blowing equipment;
Below the shower nozzle mouth described anode electrode being placed in described melt-blowing equipment, described ultra-fine fuse is coated on the surface of described anode electrode, forms barrier film on the surface of described anode electrode;
Second substrate applies negative material, and form negative electrode, the one side described negative electrode being coated with negative material is covered on the barrier film of described anode electrode.
The present invention is also by the following technical solutions:
A kind of battery preparation method, it comprises the steps:
Second substrate applies negative material, forms negative electrode;
Thermoplastic polymer is added melt-blowing equipment, and open melt-blowing equipment, described thermoplastic polymer is at the ultra-fine fuse of shower nozzle interruption-forming of described melt-blowing equipment;
Be coated with below the shower nozzle mouth being arranged in described melt-blowing equipment by described negative electrode, described ultra-fine fuse is coated on the surface of described negative electrode, forms barrier film on the surface of described negative electrode;
Apply positive electrode material on the first substrate, form anode electrode, the one side described anode electrode being coated with positive electrode material is covered on the barrier film of described negative electrode.
Wherein in some embodiments, described battery preparation method, also comprises the steps: that described anode electrode forms battery after being combined with negative material, injects the electrolyte in described battery.
Wherein in some embodiments, described electrolyte is mixed to form with 1 ~ 2.5 mole often liter by lithium salts and carbonate-based solvent; Or described electrolyte is by ethylene carbonate: mixing with the volume ratio of 1:1 of methyl ethyl carbonate, forms mixed liquor, then in above-mentioned mixed liquor, add lithium hexafluoro phosphate according to 1 mole often liter and be mixed to form.
Wherein in some embodiments, described lithium salts is mixed to form with 1 ~ 5:1 with two fluorine sulfimide lithium by lithium hexafluoro phosphate or lithium hexafluoro phosphate; Described carbonate-based solvent is mixed to form with the volume ratio of 1 ~ 3:1 by ethylene carbonate and methyl ethyl carbonate.
Wherein in some embodiments, described positive electrode material comprises cobalt acid lithium, nickel manganese cobalt ternary material, LiMn2O4 or LiFePO4 wherein one or more; Or described positive electrode material is mixed with the mass ratio of 15 ~ 20:1 with acetylene black by cobalt acid lithium, formation positive pole intermediate material, then be mixed to form with the Kynoar solution that the mass ratio of 0.8 ~ 1:1 adds 5% in described positive pole intermediate material.
Wherein in some embodiments, described negative material by graphite, acetylene black and Kynoar and METHYLPYRROLIDONE be made into 10% solution be mixed to form with 50:1:25 weight ratio; Or described negative material is mixed with the mass ratio of 40 ~ 50:1 with acetylene black by graphite, form negative pole intermediate material, then be mixed to form with the Kynoar solution that the mass ratio of 2 ~ 2.5:1 adds 10% in described negative pole intermediate material.
Wherein in some embodiments, the melt temperature of described melt-blowing equipment is 200 ~ 350 DEG C; The heat of compression air themperature that described melt-blowing equipment uses is 220 ~ 370 DEG C.
Wherein in some embodiments, the speed air flow in described melt-blowing equipment is 0.5 ~ 0.8 velocity of sound.
For achieving the above object, the present invention also adopts following technical scheme:
As described in the fibre diaphragm that formed of battery preparation method, the thickness of described fibre diaphragm is 8 ~ 350gsm, and porosity is 60% ~ 90%, and fibre diameter is 0.1 ~ 30 micron.
The barrier film of battery preparation method of the present invention and formation thereof, its compared with prior art:
This battery preparation method adopts melt-blowing equipment directly to prepare fiber fuse, then being sprayed by fiber fuse is coated on electrode, form fibre diaphragm, when using on electrode without the need to the transfer that stretches, ensure that the stability of barrier film, and after tested, the Heat stability is good of barrier film, horizontal mechanical strength is high; When being applied at lithium ion battery, there is the probability of internal short-circuit in this barrier film, and reduces being heated by potential safety hazard during mechanical presses under can reducing high rate discharge.The cell safety hidden danger be prepared into is less, and stability is high.
Accompanying drawing explanation
Fig. 1 is the melt-blowing equipment structural representation that battery preparation method described in the embodiment of the present invention uses;
Fig. 2 is the fibre diaphragm front SEM schematic diagram adopting PP material to make in battery preparation method described in the embodiment of the present invention;
Fig. 3 is the fibre diaphragm front SEM schematic diagram adopting PBT material to make in battery preparation method described in the embodiment of the present invention;
Fig. 4 is the fibre diaphragm front SEM schematic diagram adopting PC material to make in battery preparation method described in the embodiment of the present invention;
Fig. 5 is the fibre diaphragm front SEM schematic diagram adopting PET material to make in battery preparation method described in the embodiment of the present invention;
Fig. 6 is the fibre diaphragm front SEM schematic diagram adopting PPS material to make in battery preparation method described in the embodiment of the present invention;
Fig. 7 is battery charging and discharging performance schematic diagram prepared by battery preparation method described in the embodiment of the present invention;
Fig. 8 is battery coulombic efficiency figure prepared by battery preparation method described in the embodiment of the present invention.
Embodiment
For the ease of understanding the present invention, below with reference to relevant drawings, the present invention is described more fully.Preferred embodiment of the present invention is given in accompanying drawing.But the present invention can realize in many different forms, is not limited to embodiment described herein.On the contrary, provide the object of these embodiments be make the understanding of disclosure of the present invention more comprehensively thorough.
It should be noted that, when element is called as " being fixed on " another element, directly can there is element placed in the middle in it on another element or also.When an element is considered to " connection " another element, it can be directly connected to another element or may there is centering elements simultaneously.
Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.The object of term used in the description of the invention herein just in order to describe specific embodiment, is not intended to be restriction the present invention.
Battery preparation method of the present invention, comprises the steps:
Be first substrate with aluminium foil, apply positive electrode material on the first substrate, form anode electrode.Wherein positive electrode material is adopted and is made with the following method: adopt cobalt acid lithium, nickel manganese cobalt ternary material (LiNiMnCoO2), LiMn2O4 or LiFePO4 wherein one or more as positive electrode material; Or described positive electrode material is mixed with the mass ratio of 15 ~ 20:1 with acetylene black by cobalt acid lithium, formation positive pole intermediate material, then be mixed to form with the Kynoar solution that the mass ratio of 0.8 ~ 1:1 adds 5% in described positive pole intermediate material.Manufacture method is in the present embodiment: 85 kilograms of positive active material cobalts acid lithium (LiCoO2), 4.5 kilograms of conductive agent acetylene blacks mix, form positive pole intermediate material, then in above-mentioned positive pole intermediate material, add Kynoar (PVDF) solution (solvent is METHYLPYRROLIDONE) that 95 kilogram-mass marks are 5%, stir and form uniform positive electrode material.Painting method is specifically: be coated on uniformly on aluminium foil by this positive electrode material, then dries at 120 DEG C, roll-in obtains the circular anode electrode that thickness is 80 microns.
Thermoplastic polymer is added melt-blowing equipment, this thermoplastic polymer is PE, PP, PET, PBT, PA, PI, PS, PPS or PC, then this melt-blowing equipment is opened, above-mentioned thermoplastic polymer forms ultra-fine fuse and superfine fibre fuse in the shower nozzle mouth of melt-blowing equipment, wherein the melt temperature of melt-blowing equipment is 200 ~ 350 DEG C, the heat of compression air themperature that melt-blowing equipment uses is 220 ~ 370 DEG C, speed air flow in melt-blowing equipment is 0.5 ~ 0.8 velocity of sound, and ultra-fine fuse can be flowed out by shower nozzle mouth.
Below shower nozzle mouth anode electrode being placed in melt-blowing equipment, ultra-fine fuse sprays the surface being coated on anode electrode, and form superfine fibre barrier film on the surface of anode electrode, the thickness of this barrier film is 8 ~ 350gsm, and porosity is 60% ~ 90%., with the coating machine speed of service and melt blowing machine spray silk speeds control fibre diaphragm thickness.
Be second substrate with Copper Foil, second substrate applies negative material, form negative electrode.Wherein negative material is adopted and is made with the following method: negative material by graphite, acetylene black and Kynoar and METHYLPYRROLIDONE be made into 10% solution be mixed to form with 50:1:25 weight ratio; Or described negative material is mixed with the mass ratio of 40 ~ 50:1 with acetylene black by graphite, form negative pole intermediate material, then be mixed to form with the Kynoar solution that the mass ratio of 2 ~ 2.5:1 adds 10% in described negative pole intermediate material.In the present embodiment, the manufacture method of negative material is: by 70 kilograms of negative electrode active material native graphites, 1.5 kilograms of conductive agent acetylene blacks mix, form negative pole intermediate material, then in above-mentioned negative pole intermediate material, add Kynoar (PVDF) solution (solvent is METHYLPYRROLIDONE) that 35 gram mass marks are 10%, stir and form uniform negative material.
After positive pole pole electrode is combined with negative material, is prepared into the battery with aluminum plastic film encapsulation, and injects the electrolyte in battery, battery is installed complete.Wherein, electrolyte adopts described electrolyte to be mixed to form with 1 ~ 2.5 mole often liter by lithium salts and carbonate-based solvent; Wherein, lithium salts is mixed to form with 1 ~ 5:1 with two fluorine sulfimide lithium by lithium hexafluoro phosphate or lithium hexafluoro phosphate; Described carbonate-based solvent is mixed to form with the volume ratio of 1 ~ 3:1 by ethylene carbonate and methyl ethyl carbonate.Or electrolyte is by ethylene carbonate: mixing with the volume ratio of 1 ~ 3:1 of methyl ethyl carbonate, form mixed liquor, then in above-mentioned mixed liquor, add lithium hexafluoro phosphate (LiPF6) formation according to 1 mole often liter.
Battery preparation method of the present invention, also can adopt following steps:
Be second substrate with Copper Foil, second substrate applies negative material, form negative electrode.Wherein, negative material is adopted and is made with the following method: negative material by graphite, acetylene black and Kynoar and METHYLPYRROLIDONE be made into 10% solution be mixed to form with 50:1:25 weight ratio; Or described negative material is mixed with the mass ratio of 40 ~ 50:1 with acetylene black by graphite, form negative pole intermediate material, then be mixed to form with the Kynoar solution that the mass ratio of 2 ~ 2.5:1 adds 10% in described negative pole intermediate material.In the present embodiment, the manufacture method of negative material is: by 70 kilograms of negative electrode active material native graphites, 1.5 kilograms of conductive agent acetylene blacks mix, form negative pole intermediate material, then in above-mentioned negative pole intermediate material, add Kynoar (PVDF) solution (solvent is METHYLPYRROLIDONE) that 35 gram mass marks are 10%, stir and form uniform negative material.
Thermoplastic polymer is added melt-blowing equipment, this thermoplastic polymer is PE, PP, PET, PBT, PA, PI, PS, PPS or PC, then this melt-blowing equipment is opened, above-mentioned thermoplastic polymer forms ultra-fine fuse and superfine fibre fuse in the shower nozzle mouth of melt-blowing equipment, wherein the melt temperature of melt-blowing equipment is 200 ~ 350 DEG C, the heat of compression air themperature that melt-blowing equipment uses is 220 ~ 370 DEG C, speed air flow in melt-blowing equipment is 0.5 ~ 0.8 velocity of sound, and ultra-fine fuse can be flowed out by shower nozzle mouth.
Below shower nozzle mouth negative electrode being placed in melt-blowing equipment, ultra-fine fuse sprays the surface being coated on negative electrode, and form superfine fibre barrier film on the surface of negative electrode, the thickness of this barrier film is 8 ~ 350gsm, and porosity is 60% ~ 90%.
Be first substrate with aluminium foil, apply positive electrode material on the first substrate, form anode electrode.Wherein positive electrode material is adopted and is made with the following method: adopt cobalt acid lithium, nickel manganese cobalt ternary material (LiNiMnCoO2), LiMn2O4 or LiFePO4 wherein one or more as positive electrode material; Or described positive electrode material is mixed with the mass ratio of 15 ~ 20:1 with acetylene black by cobalt acid lithium, formation positive pole intermediate material, then be mixed to form with the Kynoar solution that the mass ratio of 0.8 ~ 1:1 adds 5% in described positive pole intermediate material.Manufacture method is in the present embodiment: 85 kilograms of positive active material cobalts acid lithium (LiCoO2), 4.5 kilograms of conductive agent acetylene blacks mix, form positive pole intermediate material, then in above-mentioned positive pole intermediate material, add Kynoar (PVDF) solution (solvent is METHYLPYRROLIDONE) that 95 kilogram-mass marks are 5%, stir and form uniform positive electrode material.Painting method is specifically: be coated on uniformly on aluminium foil by this positive electrode material, then dries at 120 DEG C, roll-in obtains the circular anode electrode that thickness is 80 microns.One side anode electrode being coated with positive electrode material is covered on the barrier film of negative electrode, thus uses barrier film anode electrode and negative electrode to be separated.
After anode electrode is combined with negative material, is prepared into the battery with aluminum plastic film encapsulation, and injects the electrolyte in battery, battery is installed complete.Wherein, electrolyte adopts described electrolyte to be mixed to form with 1-2.5 mole often liter by lithium salts and carbonate-based solvent; Wherein, lithium salts is mixed to form with 1 ~ 5:1 with two fluorine sulfimide lithium by lithium hexafluoro phosphate or lithium hexafluoro phosphate; Described carbonate-based solvent is mixed to form with the volume ratio of 1 ~ 3:1 by ethylene carbonate and methyl ethyl carbonate.Or electrolyte is by ethylene carbonate: mixing with the volume ratio of 1 ~ 3:1 of methyl ethyl carbonate, form mixed liquor, then in above-mentioned mixed liquor, add lithium hexafluoro phosphate (LiPF6) formation according to 1 mole often liter.
Please refer to Fig. 1, in above-mentioned battery preparation method, one gatherer 20 is set in the below of melt-blowing equipment 10, the collector 30 that anode electrode or negative electrode are formed is placed on gatherer 20, thus the superfine fibre fuse in melt-blowing equipment 10 is flow to by shower nozzle mouth on the collector 30 of below, form barrier film on collector 30 surface.Gatherer 20 is provided with pulley, can carry the slid underneath of collector 30 at melt-blowing equipment 10, so that superfine fibre fuse can be coated on collector 30 equably.
Below detect the main performance of barrier film.
The main membrane properties that need detect: micropore situation, gas permeability, hot shortness, mechanical strength and ionic conductivity.
1, the surface topography of this fibre diaphragm is detected with field emission scanning electron microscope FESEM (HitachiS-4800).The front SEM schematic diagram of this fibre diaphragm is with reference to Fig. 2 ~ Fig. 6, can find out that this fibre diaphragm is made up of a lot of fuse, and fuse intersects the Heat stability is good making this fibre diaphragm mutually, horizontal mechanical strength is high, and membrane porosity can up to 60% ~ 90%, and traditional membrane porosity is 30% ~ 60%, be therefore better than the TPO barrier film of produced in conventional processes.
2, gas permeability is detected with Gurley densitometer (4110N, Gurley), namely under both constant-pressures, the currency needed for a certain amount of air.Gained Gurley value (sec100cc-1) can the microcellular structure of quantitative response barrier film.Testing result is: the electrolyte of this fibre diaphragm Gurley value of being correlated with is better than traditional commodities polyolefin film.
3, the hot shortness of fibre diaphragm detects: at 150 DEG C and 200 DEG C, heat 1h, detects change in size.Testing result is: after 150 DEG C of heating, deformation, colour-change phenomena do not appear in this fibre diaphragm, and thermal stability is better than conventional polyolefins class barrier film.
4, electrolyte infiltrate fibre diaphragm electro-chemical test in demonstrate high-voltage stability, may be used for the high-tension battery of more than 5V.
The battery adopting said method to prepare, tests its performance by the following method.
1, (stainless steel work electrode and lithium metal counter electrode, sweep speed is 1.0mVs to adopt linear sweep voltammetry
-1) detect the electrochemical stability range of battery.Result is with reference to Fig. 7, and as can be seen from this figure, after battery used at one month, battery performance does not have significant change or reduction.
2, in the glove box of argon protection, above-mentioned battery is set up.For contrast use, set up under similarity condition and detect the element cell adopting polypropylene (PP) barrier film.The charge/discharge C-using LAND battery test system to detect battery leads ability and circulation ability.Voltage range 2.75V to 4.2V, discharge current density scope is at 0.2 (154mAg
-1) to 8C (113mAg
-1).Adopt fixing charge/discharge current density 0.5C (65mAg
-1)/0.5C (65mAg
-1) circulate and detect the circulation ability of battery.Result is with reference to Fig. 8, and as can be seen from this figure, the circulation ability of this battery is obviously better than the battery of existing use polypropylene (PP) barrier film.
Wherein, thermoplastic polymer adopts PP, Lanxess company of ExxonMobil company PBT, Pocan, Bayer company PC, Makrolon, DuPont company PET, Rynite or Celanese company PPS, Fortron.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a battery preparation method, is characterized in that, comprises the steps:
Apply positive electrode material on the first substrate, form anode electrode;
Thermoplastic polymer is added melt-blowing equipment, and open melt-blowing equipment, described thermoplastic polymer is at the ultra-fine fuse of shower nozzle interruption-forming of described melt-blowing equipment;
Below the shower nozzle mouth described anode electrode being placed in described melt-blowing equipment, described ultra-fine fuse is coated on the surface of described anode electrode, forms barrier film on the surface of described anode electrode;
Second substrate applies negative material, and form negative electrode, the one side described negative electrode being coated with negative material is covered on the barrier film of described anode electrode.
2. a battery preparation method, is characterized in that, comprises the steps:
Second substrate applies negative material, forms negative electrode;
Thermoplastic polymer is added melt-blowing equipment, and open melt-blowing equipment, described thermoplastic polymer is at the ultra-fine fuse of shower nozzle interruption-forming of described melt-blowing equipment;
Be coated with below the shower nozzle mouth being arranged in described melt-blowing equipment by described negative electrode, described ultra-fine fuse is coated on the surface of described negative electrode, forms barrier film on the surface of described negative electrode;
Apply positive electrode material on the first substrate, form anode electrode, the one side described anode electrode being coated with positive electrode material is covered on the barrier film of described negative electrode.
3. battery preparation method according to claim 1 or 2, is characterized in that, also comprises the steps: that described anode electrode forms battery after being combined with negative material, injects the electrolyte in described battery.
4. battery preparation method according to claim 3, it is characterized in that, described electrolyte is mixed to form with 1 ~ 2.5 mole often liter by lithium salts and carbonate-based solvent; Or described electrolyte is by ethylene carbonate: mixing with the volume ratio of 1:1 of methyl ethyl carbonate, forms mixed liquor, then in above-mentioned mixed liquor, add lithium hexafluoro phosphate according to 1 mole often liter and be mixed to form.
5. battery preparation method according to claim 4, is characterized in that, described lithium salts is mixed to form with 1 ~ 5:1 by lithium hexafluoro phosphate or lithium hexafluoro phosphate and two fluorine sulfimide lithium; Described carbonate-based solvent is mixed to form with the volume ratio of 1 ~ 3:1 by ethylene carbonate and methyl ethyl carbonate.
6. battery preparation method according to claim 1 or 2, is characterized in that, described positive electrode material comprises cobalt acid lithium, nickel manganese cobalt ternary material, LiMn2O4 or LiFePO4 wherein one or more; Or described positive electrode material is mixed with the mass ratio of 15 ~ 20:1 with acetylene black by cobalt acid lithium, formation positive pole intermediate material, then be mixed to form with the Kynoar solution that the mass ratio of 0.8 ~ 1:1 adds 5% in described positive pole intermediate material.
7. battery preparation method according to claim 1 or 2, is characterized in that, described negative material by graphite, acetylene black and Kynoar and METHYLPYRROLIDONE be made into 10% solution be mixed to form with 50:1:25 weight ratio; Or described negative material is mixed with the mass ratio of 40 ~ 50:1 with acetylene black by graphite, form negative pole intermediate material, then be mixed to form with the Kynoar solution that the mass ratio of 2 ~ 2.5:1 adds 10% in described negative pole intermediate material.
8. battery preparation method according to claim 1 or 2, is characterized in that, the melt temperature of described melt-blowing equipment is 200 ~ 350 DEG C; The heat of compression air themperature that described melt-blowing equipment uses is 220 ~ 370 DEG C.
9. battery preparation method according to claim 1 or 2, is characterized in that, the speed air flow in described melt-blowing equipment is 0.5 ~ 0.8 velocity of sound.
10. a fibre diaphragm for battery preparation method formation as claimed in claim 1 or 2, is characterized in that: the thickness of described fibre diaphragm is 8 ~ 350gsm, and porosity is 60% ~ 90%, and fibre diameter is 0.1 ~ 30 micron.
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| CN201511000761.8A CN105428578A (en) | 2015-12-24 | 2015-12-24 | Battery production method and fiber diaphragm formed thereby |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114335886A (en) * | 2021-12-27 | 2022-04-12 | 福建新峰二维材料科技有限公司 | Preparation method of electric spray coating battery |
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