CN104900919A - Fabrication technique of polymer li-ion battery - Google Patents
Fabrication technique of polymer li-ion battery Download PDFInfo
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- CN104900919A CN104900919A CN201510282309.9A CN201510282309A CN104900919A CN 104900919 A CN104900919 A CN 104900919A CN 201510282309 A CN201510282309 A CN 201510282309A CN 104900919 A CN104900919 A CN 104900919A
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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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
- H01M2300/00—Electrolytes
- H01M2300/0088—Composites
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention discloses a fabrication technique of a polymer li-ion battery. The fabrication technique comprises steps as follows: ageing a battery cell after injecting; performing hot-pressing polymerization and formation of the battery cell after ageing with an arbitrary order, so as to get the polymer li-ion battery, wherein the membrane of the battery cell is polyethylene film deposited by polyvinylidene fluoride or polypropylene film deposited by polyvinylidene fluoride. According to the fabrication technique provided by the invention, through hot-pressing polymerization, the prepared polymer li-ion battery has higher electrical performance. In addition, the polymer li-ion battery has higher hardness and higher energy density. Indicated by experimental results, the hardness of the polymer li-ion battery prepared by the fabrication technique is 3 to 7 degrees; the energy density of the polymer li-ion battery is 520 to 580 Wh/L; and the capacity retention ratio of the polymer li-ion battery under 0.5C after charging and discharging circle for 500 times is 80 to 85 percent.
Description
Technical field
The present invention relates to the making field of lithium ion battery, particularly relate to a kind of manufacture craft of polymer Li-ion battery.
Background technology
Consumption electronic product power supply adopts box hat usually, lithium ion battery with aluminum shell, but due to the upgrading of consumption electronic product in recent years, shortening of the cycle upgraded, the project cycle shortened to 1 year even some months by 2 ~ 5 years, conventional box hat, aluminum-shell battery cannot adapt to the change that this new product changes the battery size brought, and be polymerized lithium ion battery and can change according to project, flexibly, make good reaction fast, can at any time for client carries out customized product making, polymer Li-ion battery has higher security performance simultaneously, bring the change of consumption electronic product power supply type thus, by box hat, aluminum hull adjusts to polymer Li-ion battery gradually.
In prior art, the manufacture craft of polymer Li-ion battery comprises: slurry tablet making technology, winding packaging technology, fluid injection chemical synthesis technology, secondary encapsulation technique and partial volume characterization processes, and wherein slurry tablet making technology comprises: foil selects-is coated with-and cuts sheet-entire volume baking-compressing tablet-positive pole to paste large glue-cut small pieces-pole piece stepping-tab welding-lug rubberizing-pole piece dust suction-pole piece secondary baking.Winding packaging technology comprises: and winding-core examines entirely-and core hot pressing-core dust suction short-circuit test-film is shaping-enter shell-top side seal-pad pasting-survey short circuit.Fluid injection chemical synthesis technology comprises: baking-injection test liquid-fluid injection, obtains the battery after fluid injection; Battery is vacuumized-vacuum one envelope-reservoir quantity examines entirely-clean surface electrolyte-ageing-change into-lug sleeve pipe-change into after shelve.
Consumption electronic product is to the change of intelligent, screen enlarging and portability, bring polymer Li-ion battery trend thickness thinning gradually, area becomes large gradually, if because this change causes battery to adopt conventional design, the inside both positive and negative polarity of battery and the interlamellar spacing of barrier film uncontrollable, there is very large space, formed after battery, inside battery has more gas to exist, and causes the problems such as battery electrical property declines, energy density is low, battery hardness is low.In prior art, polymer Li-ion battery adopts lower vacuum to be exhausted when secondary vacuum seals, can the inner Coating combination of lifting to a certain degree tight, reduce internal residual gas, but its side effect is, inner partial electrolyte liquid is also drawn out of, cause resultant battery to owe liquid, the electrical property of battery is declined.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of manufacture craft of polymer Li-ion battery, the polymer Li-ion battery that manufacture craft provided by the invention makes has higher electrical property.
The invention provides a kind of manufacture craft of polymer Li-ion battery, comprise the following steps:
Battery after fluid injection is carried out ageing;
Battery after ageing carried out hot pressing polymerization with any order and changes into, obtaining polymer Li-ion battery;
The barrier film of described battery is the polyethylene film of Kynoar coating or the polypropylene screen of Kynoar coating.
Preferably, the temperature of described hot pressing polymerization is 30 DEG C ~ 80 DEG C.
Preferably, the temperature of described hot pressing polymerization is 40 DEG C ~ 70 DEG C.
Preferably, the time of described hot pressing polymerization is 10s ~ 360s.
Preferably, the time of described hot pressing polymerization is 30s ~ 180s.
Preferably, the pressure of described hot pressing polymerization is 0.1 ~ 0.7N/mm
2.
Preferably, the pressure of described hot pressing polymerization is 0.3 ~ 0.6N/mm
2.
Preferably, the temperature of described ageing is preferably 35 DEG C ~ 45 DEG C; The time of described ageing is preferably 16h ~ 24h.
Preferably, the battery after described ageing carries out hot pressing polymerization and changes into being specially with any order;
Battery after described ageing is carried out hot pressing polymerization, changes into and is again carried out hot pressing polymerization.
Preferably, described carry out hot pressing polymerization with any order and change into after, before obtaining polymer Li-ion battery, also comprise vacuum two envelope;
The pressure of described vacuum two envelope is 0.3 ~ 0.7MPa.
The invention provides a kind of manufacture craft of polymer Li-ion battery, comprise the following steps: the battery after fluid injection is carried out ageing; Battery after ageing carried out hot pressing polymerization with any order and changes into, obtaining polymer Li-ion battery; The barrier film of described battery is the polyethylene film of Kynoar coating or the polypropylene screen of Kynoar coating.Manufacture craft provided by the invention is polymerized by hot pressing, makes the polymer Li-ion battery obtained have higher electrical property.In addition, the battery that manufacture craft provided by the invention makes also has higher battery hardness and higher energy density.Experimental result shows: the battery hardness of the polymer Li-ion battery that manufacture craft provided by the invention makes is 3 degree ~ 7 degree; The energy density of polymer Li-ion battery is 520Wh/L ~ 580Wh/L; The 0.5C charge and discharge of the polymer Li-ion battery 500 cycle capability retentions that circulate are 80% ~ 85%.
Embodiment
The invention provides a kind of manufacture craft of polymer Li-ion battery, comprise the following steps:
Battery after fluid injection is carried out ageing;
Battery after ageing carried out hot pressing polymerization with any order and changes into, obtaining polymer Li-ion battery;
The barrier film of described battery is the polyethylene film of Kynoar coating or the polypropylene screen of Kynoar coating.
In the present invention, the positive pole of described battery is preferably one or more in cobalt acid lithium, LiMn2O4 and lithium nickelate; The negative pole of described battery is preferably Delanium or carbonaceous mesophase spherules.
Barrier film in battery is polypropylene (PP) film of polyethylene (PE) film that applies of Kynoar (PVDF) or PVDF coating.In a particular embodiment of the present invention, described barrier film is specially Korea S W-scope and applies barrier film.
The present invention does not have special restriction to the electrolyte that fluid injection adopts, and adopts electrolyte when preparing polymer Li-ion battery well known to those skilled in the art.In the present invention, the electrolyte of employing preferably includes LiPF
6salt, diethyl carbonate (DEC), ethylene carbonate (EC), polystyrene (PS) and vinylene carbonate (VC).In a particular embodiment of the present invention, described LiPF
6the molar concentration of salt is preferably 0.8 ~ 1.3mol/L, is more preferably 1.0 ~ 1.1mol/L; Described LiPF
6the mass ratio of the amount of substance of salt, the quality of diethyl carbonate, the quality of ethylene carbonate, the quality of polystyrene and vinylene carbonate is preferably (1.0 ~ 1.1) mol:(30 ~ 70) g:(20 ~ 50) g:(3 ~ 10) g:(3 ~ 10) g, be more preferably (1.02 ~ 1.07) mol:(50 ~ 60) g:(30 ~ 40) g:(5 ~ 8) g:(5 ~ 8) g.
The present invention preferably carries out vacuum one envelope by completing the battery after fluid injection.The method of the present invention to vacuum one envelope does not have special restriction, adopts vacuum one encapsulation technique scheme well known to those skilled in the art.In the present invention, during described vacuum one envelope, the temperature of upper cover is preferably 180 DEG C ~ 190 DEG C; The temperature of bottom head is preferably 180 DEG C ~ 190 DEG C; The time of described vacuum one envelope is preferably 4 ~ 6s; The pressure of described vacuum one envelope is preferably 0.35MPa ~ 0.45MPa; Vacuum degree during described vacuum one envelope is preferably below-0.085MPa; The Edge strength of described vacuum one envelope is preferably greater than or equal to 35N/15mm.
The method of the present invention to ageing does not have special restriction, adopts ageing technical scheme well known to those skilled in the art.In the present invention, the temperature of described ageing is preferably 35 DEG C ~ 45 DEG C; The time of described ageing is preferably 16h ~ 24h.
After completing ageing, the present invention carries out hot pressing polymerization to the battery after ageing.Hot pressing polymerization called after first hot pressing after next-door neighbour's ageing, in order to distinguish the hot pressing polymerization described in following technical proposals, is polymerized by the present invention.In the present invention, the temperature of described first hot pressing polymerization is preferably 30 DEG C ~ 80 DEG C, is more preferably 40 DEG C ~ 70 DEG C; The time of described first hot pressing polymerization is preferably 10s ~ 360s, is more preferably 30s ~ 180s; The pressure of described first hot pressing polymerization is preferably 0.1 ~ 0.7N/mm
2, be more preferably 0.3 ~ 0.6N/mm
2.The present invention preferably adopts the automatic cooling/heating spreader bar of the prosperous brightness in Huizhou to carry out hot pressing polymerization.The polymerization of positive pole, negative pole and barrier film is bonded together by hot pressing polymerization by the present invention, forms an entirety.
After completing the first hot pressing polymerization, the battery after the first hot pressing polymerization preferably changes into by the present invention.The present invention does not have special restriction to the method changed into, and adopts forming technology scheme well known to those skilled in the art.In the present invention, change into described in and adopt multistage charging modes; In a particular embodiment of the present invention, the present invention first adopts the electric current of 0.02C, and voltage control carries out changing into 1 ~ 3h within 3.4V; The electric current of 0.2C, voltage control is adopted to carry out changing into 2 ~ 4h within 3.9V again.The present invention makes to form stable, fine and close solid electrolyte interface (SEI) film by changing into of multistage charging modes.
In the present invention, change into or after hot pressing polymerization, before obtaining polymer Li-ion battery, preferably also comprise vacuum two envelope.The present invention can directly carry out vacuum two envelope to the battery after changing into, and obtains polymer Li-ion battery; Also can carry out the second hot pressing polymerization to the battery after changing into, carry out vacuum two envelope again after the second hot pressing polymerization, obtain polymer Li-ion battery.
In the present invention, the temperature of described second hot pressing polymerization is preferably 30 DEG C ~ 80 DEG C, is more preferably 40 DEG C ~ 70 DEG C; The time of described second hot pressing polymerization is preferably 10s ~ 360s, is more preferably 30s ~ 180s; The pressure of described second hot pressing polymerization is preferably 0.1 ~ 0.7N/mm
2, be more preferably 0.3 ~ 0.6N/mm
2.
The method of the present invention to vacuum two envelope does not have special restriction, adopts the technical scheme of vacuum two envelope well known to those skilled in the art.In the present invention, during described vacuum two envelope, the temperature of upper cover is preferably 175 DEG C ~ 185 DEG C; The temperature of bottom head is preferably 175 DEG C ~ 185 DEG C; Pressure during described vacuum two envelope is preferably 0.3 ~ 0.7MPa; The vacuum degree of described vacuum two envelope is preferably-0.85MPa ~-0.95MPa, is more preferably 0.9MPa.
Complete vacuum two to be honored as a queen, the present invention preferably carries out partial volume to the battery that vacuum two is honored as a queen.The method of the present invention to partial volume does not have special restriction, adopts partial volume technical scheme well known to those skilled in the art.
In certain embodiments of the present invention, the manufacture craft of polymer Li-ion battery specifically comprises the following steps:
Battery after fluid injection carried out successively vacuum one envelope, ageing, hot pressing polymerization, change into and vacuum two envelope, obtain polymer Li-ion battery;
The barrier film of described battery is the polyethylene film of Kynoar coating or the polypropylene screen of Kynoar coating.
In certain embodiments of the present invention, the manufacture craft of polymer Li-ion battery specifically comprises the following steps:
Battery after fluid injection is carried out successively vacuum one envelope, ageing, hot pressing is polymerized, changes into, again carries out hot pressing polymerization, vacuum two envelope and partial volume, obtain polymer Li-ion battery;
The barrier film of described battery is the polyethylene film of Kynoar coating or the polypropylene screen of Kynoar coating.
In certain embodiments of the present invention, the manufacture craft of polymer Li-ion battery specifically comprises the following steps:
Battery after fluid injection carried out successively vacuum one envelope, ageing, change into, hot pressing polymerization, vacuum two envelope and partial volume, obtain polymer Li-ion battery;
The barrier film of described battery is the polyethylene film of Kynoar coating or the polypropylene screen of Kynoar coating.
The present invention adopts the method for testing in the patent No. 201210484512.0 to carry out the mensuration of battery hardness to obtained polymer Li-ion battery.
The invention provides a kind of manufacture craft of polymer Li-ion battery, comprise the following steps: the battery after fluid injection is carried out ageing; Battery after ageing carried out hot pressing polymerization with any order and changes into, obtaining polymer Li-ion battery; The barrier film of described battery is the polyethylene film of Kynoar coating or the polypropylene screen of Kynoar coating.Manufacture craft provided by the invention is polymerized by hot pressing, makes the polymer Li-ion battery obtained have higher electrical property.In addition, the polymer Li-ion battery that manufacture craft provided by the invention makes also has higher battery hardness and higher energy density.Experimental result shows: the battery hardness of the polymer Li-ion battery that manufacture craft provided by the invention makes is 3 degree ~ 7 degree; The energy density of polymer Li-ion battery is 520Wh/L ~ 580Wh/L; The 0.5C charge and discharge of the polymer Li-ion battery 500 cycle capability retentions that circulate are 80% ~ 85%.
The present invention is polymerized by hot pressing, by complete for polymer lithium ion battery internal thermal polymerization, but inside battery electrolyte can not be affected infiltrate and the formation of lithium ion battery SEI film, can guarantee that the properties of polymer Li-ion battery prepared by the present invention and non-Kynoar apply the performance of the polymer Li-ion battery of barrier film suitable.
In order to further illustrate the present invention, being described in detail below in conjunction with the manufacture craft of embodiment to a kind of polymer Li-ion battery provided by the invention, but they can not being interpreted as limiting the scope of the present invention.
Embodiment 1
Adopt cobalt acid lithium as positive pole, adopt carbonaceous mesophase spherules as negative pole, adopt the PE film of coating PVDF as barrier film, adopt the LiPF of 600g DEC, 300g EC, 5g PS, 5g VC and 1.05mol
6salt is as electrolyte, and packaging film adopts the C40 of Japanese Showa; Adopt above-mentioned raw material to carry out processing winding, after completing winding, carry out closedtop and side seal, then in the baking oven of 80 DEG C, carry out the baking of vacuum nitrogen filling gas, after the baking being greater than 12h, make battery internal moisture within 100ppm; Lower the temperature afterwards, carry out fluid injection behind temperature≤40 DEG C, obtain the battery after fluid injection, then vacuum placement and vacuum one envelope are carried out to battery;
Complete vacuum one to be honored as a queen, to battery ageing 20h at 43 DEG C that vacuum one is honored as a queen, obtain the battery after ageing;
To the battery after ageing 30 DEG C, pressure is 0.1N/mm
-2under carry out hot pressing polymerization 10s, obtain hot pressing polymerization battery;
The battery of hot pressing polymerization is first adopted to the electric current of 0.02C, voltage control carries out changing into 2h within 3.4V; The electric current of 0.2C, voltage control is adopted to carry out changing into 3h within 3.9V again;
Carry out vacuum two envelope to the battery after changing into, the vacuum degree of vacuum two envelope is-0.9MPa;
Complete vacuum two to be honored as a queen, partial volume detection is carried out to the battery that vacuum two envelope obtains, obtains polymer Li-ion battery.
The present invention carries out performance test to obtained polymer Li-ion battery, and test result is shown in Table 1, and table 1 is the performance test results of the polymer Li-ion battery that the embodiment of the present invention 1 obtains:
The performance test results of the polymer Li-ion battery that table 1 embodiment of the present invention 1 is obtained
Embodiment 2
Adopt LiMn2O4 as positive pole, adopt carbonaceous mesophase spherules as negative pole, adopt the PE film of coating PVDF as barrier film, adopt the LiPF of 600g DEC, 300g EC, 5g PS, 5g VC and 1.05mol
6salt is as electrolyte, and packaging film adopts the C40 of Japanese Showa; Adopt above-mentioned raw material to carry out processing winding, after completing winding, carry out closedtop and side seal, then in the baking oven of 80 DEG C, carry out the baking of vacuum nitrogen filling gas, after the baking being greater than 12h, make battery internal moisture within 100ppm; Lower the temperature afterwards, carry out fluid injection behind temperature≤40 DEG C, obtain the battery after fluid injection, then vacuum placement and vacuum one envelope are carried out to battery;
Complete vacuum one to be honored as a queen, to battery ageing 20h at 43 DEG C that vacuum one is honored as a queen, obtain the battery after ageing;
To the battery after ageing 80 DEG C, pressure is 0.7N/mm
-2under carry out hot pressing polyase 13 60s, obtain hot pressing polymerization battery;
The battery of hot pressing polymerization is first adopted to the electric current of 0.02C, voltage control carries out changing into 2.5h within 3.4V; The electric current of 0.2C, voltage control is adopted to carry out changing into 4h within 3.9V again;
Vacuum two envelope and partial volume detection are carried out to the battery after changing into, obtains polymer Li-ion battery.
The present invention carries out performance test to obtained polymer Li-ion battery, and test result is shown in Table 2, and table 2 is the performance test results of the polymer Li-ion battery that the embodiment of the present invention 2 obtains:
The performance test results of the polymer Li-ion battery that table 2 embodiment of the present invention 2 is obtained
Embodiment 3
Adopt cobalt acid lithium as positive pole, adopt Delanium as negative pole, adopt the PE film of coating PVDF as barrier film, adopt the LiPF of 600g DEC, 300g EC, 5g PS, 5g VC and 1.05mol
6salt is as electrolyte, and packaging film adopts the C40 of Japanese Showa; Adopt above-mentioned raw material to carry out processing winding, after completing winding, carry out closedtop and side seal, then in the baking oven of 80 DEG C, carry out the baking of vacuum nitrogen filling gas, after the baking being greater than 12h, make battery internal moisture within 100ppm; Lower the temperature afterwards, carry out fluid injection behind temperature≤40 DEG C, obtain the battery after fluid injection, then vacuum placement and vacuum one envelope are carried out to battery;
Complete vacuum one to be honored as a queen, to battery ageing 20h at 43 DEG C that vacuum one is honored as a queen, obtain the battery after ageing;
To the battery after ageing 50 DEG C, pressure is 0.3N/mm
-2under carry out hot pressing polymerization 180s, obtain hot pressing polymerization battery;
The battery of hot pressing polymerization is first adopted to the electric current of 0.02C, voltage control carries out changing into 2h within 3.4V; The electric current of 0.2C, voltage control is adopted to carry out changing into 2h within 3.9V again;
Carry out vacuum two envelope to the battery after changing into, the vacuum degree of vacuum two envelope is-0.9MPa;
Complete vacuum two to be honored as a queen, partial volume detection is carried out to the battery that vacuum two envelope obtains, obtains polymer Li-ion battery.
The present invention carries out performance test to obtained polymer Li-ion battery, and test result is shown in Table 3, and table 3 is the performance test results of the polymer Li-ion battery that the embodiment of the present invention 3 obtains:
The performance test results of the polymer Li-ion battery that table 3 embodiment of the present invention 3 is obtained
Embodiment 4
Adopt cobalt acid lithium as positive pole, adopt carbonaceous mesophase spherules as negative pole, adopt the PE film of coating PVDF as barrier film, adopt the LiPF of 600g DEC, 300g EC, 5g PS, 5g VC and 1.05mol
6salt is as electrolyte, and packaging film adopts the C40 of Japanese Showa; Adopt above-mentioned raw material to carry out processing winding, after completing winding, carry out closedtop and side seal, then in the baking oven of 80 DEG C, carry out the baking of vacuum nitrogen filling gas, after the baking being greater than 12h, make battery internal moisture within 100ppm; Lower the temperature afterwards, carry out fluid injection behind temperature≤40 DEG C, obtain the battery after fluid injection, then vacuum placement and vacuum one envelope are carried out to battery;
Complete vacuum one to be honored as a queen, to battery ageing 20h at 43 DEG C that vacuum one is honored as a queen, obtain the battery after ageing;
To the battery after ageing 50 DEG C, pressure is 0.4N/mm
-2under carry out hot pressing polymerization 240s, obtain hot pressing polymerization battery;
The battery of hot pressing polymerization is first adopted to the electric current of 0.02C, voltage control carries out changing into 3h within 3.4V; The electric current of 0.2C, voltage control is adopted to carry out changing into 3.5h within 3.9V again;
To the battery after changing into 50 DEG C, pressure is 0.4N/mm
-2under carry out secondary hot pressing polymerization 240s,
Vacuum two envelope and partial volume detection are carried out to the battery after completing secondary hot pressing polymerization, obtains polymer Li-ion battery.
The present invention carries out performance test to obtained polymer Li-ion battery, and test result is shown in Table 4, and table 4 is the performance test results of the polymer Li-ion battery that the embodiment of the present invention 4 obtains:
The performance test results of the polymer Li-ion battery that table 4 embodiment of the present invention 4 is obtained
Embodiment 5
Adopt cobalt acid lithium as positive pole, adopt carbonaceous mesophase spherules as negative pole, adopt the PE film of coating PVDF as barrier film, adopt the LiPF of 600g DEC, 300g EC, 5g PS, 5g VC and 1.05mol
6salt is as electrolyte, and packaging film adopts the C40 of Japanese Showa; Adopt above-mentioned raw material to carry out processing winding, after completing winding, carry out closedtop and side seal, then in the baking oven of 80 DEG C, carry out the baking of vacuum nitrogen filling gas, after the baking being greater than 12h, make battery internal moisture within 100ppm; Lower the temperature afterwards, carry out fluid injection behind temperature≤40 DEG C, obtain the battery after fluid injection, then vacuum placement and vacuum one envelope are carried out to battery;
Complete vacuum one to be honored as a queen, to battery ageing 20h at 43 DEG C that vacuum one is honored as a queen, obtain the battery after ageing;
The battery of ageing is first adopted to the electric current of 0.02C, voltage control carries out changing into 3h within 3.4V; The electric current of 0.2C, voltage control is adopted to carry out changing into 2h within 3.9V again;
To the battery after changing into 75 DEG C, pressure is 0.6N/mm
-2under carry out hot pressing polymerization 180s, obtain hot pressing polymerization battery;
Vacuum two envelope and partial volume detection are carried out to the battery after hot pressing polymerization, obtains polymer Li-ion battery.
The present invention carries out performance test to obtained polymer Li-ion battery, and test result is shown in Table 5, and table 5 is the performance test results of the polymer Li-ion battery that the embodiment of the present invention 5 obtains:
The performance test results of the polymer Li-ion battery that table 5 embodiment of the present invention 5 is obtained
As seen from the above embodiment, the invention provides a kind of manufacture craft of polymer Li-ion battery, comprise the following steps: the battery after fluid injection is carried out ageing; Battery after changing into carried out hot pressing polymerization with any order and changes into, obtaining polymer Li-ion battery; The barrier film of described battery is the polyethylene film of Kynoar coating or the polypropylene screen of Kynoar coating.Manufacture craft provided by the invention is polymerized by hot pressing, makes the polymer Li-ion battery obtained have higher electrical property.In addition, the battery that manufacture craft provided by the invention makes also has higher battery hardness and higher energy density.Experimental result shows: the battery hardness of the polymer Li-ion battery that manufacture craft provided by the invention makes is 3 degree ~ 7 degree; The energy density of polymer Li-ion battery is 520Wh/L ~ 580Wh/L; The 0.5C charge and discharge of the polymer Li-ion battery 500 cycle capability retentions that circulate are 80% ~ 85%.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a manufacture craft for polymer Li-ion battery, comprises the following steps:
Battery after fluid injection is carried out ageing;
Battery after ageing carried out hot pressing polymerization with any order and changes into, obtaining polymer Li-ion battery;
The barrier film of described battery is the polyethylene film of Kynoar coating or the polypropylene screen of Kynoar coating.
2. manufacture craft according to claim 1, is characterized in that, the temperature of described hot pressing polymerization is 30 DEG C ~ 80 DEG C.
3. manufacture craft according to claim 1, is characterized in that, the temperature of described hot pressing polymerization is 40 DEG C ~ 70 DEG C.
4. manufacture craft according to claim 1, is characterized in that, the time of described hot pressing polymerization is 10s ~ 360s.
5. manufacture craft according to claim 1, is characterized in that, the time of described hot pressing polymerization is 30s ~ 180s.
6. manufacture craft according to claim 1, is characterized in that, the pressure of described hot pressing polymerization is 0.1 ~ 0.7N/mm
2.
7. manufacture craft according to claim 1, is characterized in that, the pressure of described hot pressing polymerization is 0.3 ~ 0.6N/mm
2.
8. manufacture craft according to claim 1, is characterized in that, the temperature of described ageing is preferably 35 DEG C ~ 45 DEG C; The time of described ageing is preferably 16h ~ 24h.
9. manufacture craft according to claim 1, is characterized in that, the battery after described ageing carries out hot pressing polymerization and change into being specially with any order;
Battery after described ageing is carried out hot pressing polymerization, changes into and is again carried out hot pressing polymerization.
10. manufacture craft according to claim 1, is characterized in that, described carry out hot pressing polymerization with any order and change into after, before obtaining polymer Li-ion battery, also comprise vacuum two envelope;
The pressure of described vacuum two envelope is 0.3 ~ 0.7MPa.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106558726A (en) * | 2015-09-24 | 2017-04-05 | 中信国安盟固利动力科技有限公司 | A kind of titanium system negative electrode lithium ion battery |
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| CN113682586A (en) * | 2021-07-15 | 2021-11-23 | 惠州锂威新能源科技有限公司 | Battery manufacturing process, film tearing method and film tearing device |
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