CN116454398A - Manufacturing method of lithium ion battery - Google Patents
Manufacturing method of lithium ion battery Download PDFInfo
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- CN116454398A CN116454398A CN202310271598.7A CN202310271598A CN116454398A CN 116454398 A CN116454398 A CN 116454398A CN 202310271598 A CN202310271598 A CN 202310271598A CN 116454398 A CN116454398 A CN 116454398A
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- Prior art keywords
- battery
- lithium ion
- ion battery
- manufacturing
- conductive agent
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 239000006258 conductive agent Substances 0.000 claims abstract description 44
- 239000003792 electrolyte Substances 0.000 claims abstract description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000002985 plastic film Substances 0.000 claims abstract description 15
- 229920006255 plastic film Polymers 0.000 claims abstract description 15
- 238000004806 packaging method and process Methods 0.000 claims abstract description 14
- 229910021383 artificial graphite Inorganic materials 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 8
- 238000005755 formation reaction Methods 0.000 claims abstract description 8
- 238000011049 filling Methods 0.000 claims abstract description 7
- 238000001994 activation Methods 0.000 claims abstract description 6
- 230000004913 activation Effects 0.000 claims abstract description 6
- 238000000465 moulding Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 28
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical group [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 claims description 16
- 239000007770 graphite material Substances 0.000 claims description 15
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 13
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 13
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 13
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 claims description 11
- 229910003002 lithium salt Inorganic materials 0.000 claims description 11
- 159000000002 lithium salts Chemical class 0.000 claims description 11
- 239000002904 solvent Substances 0.000 claims description 11
- 239000002033 PVDF binder Substances 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 10
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 239000011889 copper foil Substances 0.000 claims description 9
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 239000006245 Carbon black Super-P Substances 0.000 claims description 5
- 239000002000 Electrolyte additive Substances 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 5
- 239000002041 carbon nanotube Substances 0.000 claims description 5
- 239000011888 foil Substances 0.000 claims description 5
- 229910021389 graphene Inorganic materials 0.000 claims description 5
- 229910021382 natural graphite Inorganic materials 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 230000009897 systematic effect Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 2
- 239000004698 Polyethylene Substances 0.000 description 12
- 239000011812 mixed powder Substances 0.000 description 8
- 238000003756 stirring Methods 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- OTYYBJNSLLBAGE-UHFFFAOYSA-N CN1C(CCC1)=O.[N] Chemical compound CN1C(CCC1)=O.[N] OTYYBJNSLLBAGE-UHFFFAOYSA-N 0.000 description 2
- 238000010277 constant-current charging Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000000010 aprotic solvent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a manufacturing method of a lithium ion battery, which comprises the following steps: fixing a battery positive plate, a battery negative plate and a battery diaphragm in one mode of stacking and winding; packaging the fixed battery positive plate, the battery negative plate and the battery diaphragm in an aluminum plastic film of a battery shell; and filling electrolyte into the aluminum plastic film of the battery shell, which is packaged with the battery positive plate, the battery negative plate and the battery diaphragm, and carrying out activation, formation, packaging and molding to obtain the lithium ion battery. Details in the processing process of the lithium ion battery are systematically controlled, including arrangement modes of a battery diaphragm, a positive plate and a negative plate, and use requirements on a super conductive agent and a negative active layer; according to the systematic requirements, the difference in performance of the lithium ion battery prepared from the artificial graphite or the natural graphite is reduced, the cost is controlled, and the improvement of profit margin of lithium ion battery manufacturers is facilitated.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a manufacturing method of a lithium ion battery.
Background
Conventionally, a lithium ion battery is a rechargeable battery, which relies on lithium ions moving between positive and negative electrodes to generate current, and lithium ions are inserted and removed back and forth between the positive and negative electrodes during the charge and discharge of the lithium ion battery.
In the prior art, a lithium ion battery consists of a battery positive plate, a battery diaphragm, an aluminum plastic film and electrolyte; the manufacturing process of the lithium ion battery generally comprises the steps of anode homogenization, coating, rolling, slitting, baking, winding, shell filling, spot welding, baking, liquid injection, cleaning, drying, storage, formation and the like;
the active powder on the negative plate of the conventional lithium ion battery consists of natural graphite, ding Ben rubber, a super conductive agent and sodium carboxymethyl cellulose, and the natural graphite is widely used in the manufacturing process of the lithium ion battery due to low price, but has different size particles and wide particle size distribution, and needs to be subjected to a series of processing treatments, so that the lithium ion battery needs to achieve the same performance and needs to consume higher cost;
therefore, a method for manufacturing a lithium ion battery is proposed to solve the above problems.
Disclosure of Invention
In order to overcome the defects in the prior art and solve at least one of the problems, the invention provides a manufacturing method of a lithium ion battery.
A method for manufacturing a lithium ion battery, the method comprising:
step S1: fixing a battery positive plate, a battery negative plate and a battery diaphragm in one mode of stacking and winding;
step S2: packaging the fixed battery positive plate, the battery negative plate and the battery diaphragm in an aluminum plastic film of a battery shell;
step S3: and filling electrolyte into the aluminum plastic film of the battery shell, which is packaged with the battery positive plate, the battery negative plate and the battery diaphragm, and carrying out activation, formation, packaging and molding to obtain the lithium ion battery.
Preferably, the battery negative electrode sheet comprises negative electrode active powder, copper foil, negative electrode tab and super conductive agent; the negative electrode active powder is made of artificial graphite material; the battery positive plate comprises positive active powder, aluminum foil, positive lugs, super conductive agent and adhesive; the positive active powder is lithium iron manganese phosphate.
Preferably, the Super conductive agent is one or more of Super-P, graphene and carbon nano tubes; the battery diaphragm is one of a PP film, a PE film and a mixed film of PP+PVDF+ceramic; the battery electrolyte consists of a solvent, an additive and lithium salt.
Preferably, in the battery negative plate, the negative active powder comprises graphite material, ding Ben rubber, super conductive agent and sodium carboxymethyl cellulose, wherein the proportion of the graphite material is 92% -96%, the proportion of the Ding Ben rubber is 1% -3%, the proportion of the super conductive agent is 1% -3%, and the proportion of the sodium carboxymethyl cellulose is 1% -3%.
Preferably, in the battery positive plate, the positive active powder comprises a lithium iron manganese phosphate material, a super conductive agent and vinylidene fluoride, wherein the proportion of the lithium iron manganese phosphate material is 90% -96%, the proportion of the super conductive agent is 1% -3%, and the proportion of the vinylidene fluoride is 2% -4%.
Preferably, the PP film has a thickness of 3um to 25um; the thickness of the PE film is 3um-25um; the thickness of the mixed film of the PP+PVDF+ceramic is 3um to 25um.
Preferably, the battery electrolyte solvent is one or more of PP, EP, DEC, DMC, EC, PC.
Preferably, the electrolyte additive consists of one or more of PS, ES, VEC, VC; the electrolyte lithium salt consists of one or more of LIPF6, LIClO4 and LITFSI.
The invention has the advantages that:
the invention systematically controls details in the processing process of the lithium ion battery, including arrangement modes of a battery diaphragm, a positive plate and a negative plate, and the use requirements on a super conductive agent and a negative active layer; according to the systematic requirements, the difference in performance of the lithium ion battery prepared from the artificial graphite or the natural graphite is reduced, the cost is controlled, and the improvement of profit margin of lithium ion battery manufacturers is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a flow chart of a method of manufacturing an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
a method for manufacturing a lithium ion battery, the method comprising:
step S1: fixing a battery positive plate, a battery negative plate and a battery diaphragm in one mode of stacking and winding;
step S2: packaging the fixed battery positive plate, the battery negative plate and the battery diaphragm in an aluminum plastic film of a battery shell;
step S3: filling electrolyte into an aluminum plastic film of a battery shell, which is packaged with a battery positive plate, a battery negative plate and a battery diaphragm, and carrying out activation, formation, packaging and molding to prepare a lithium ion battery; the lithium ion battery can be manufactured into a square plane structure or a curved surface structure.
As one embodiment of the invention, the battery negative plate comprises negative active powder, copper foil, a negative tab and a super conductive agent; the negative electrode active powder is made of artificial graphite material; the battery positive plate comprises positive active powder, aluminum foil, positive lugs, super conductive agent and adhesive; the positive active powder is lithium iron manganese phosphate.
As one embodiment of the present invention, the Super conductive agent is one or more of Super-P, graphene and carbon nanotubes; the battery diaphragm is one of a PP film, a PE film and a mixed film of PP+PVDF+ceramic; the battery electrolyte consists of a solvent, an additive and lithium salt;
as an embodiment of the invention, in the battery negative electrode sheet, the negative electrode active powder comprises graphite material, ding Ben rubber, super conductive agent and sodium carboxymethyl cellulose, wherein the proportion of the graphite material is 92%, the proportion of the Ding Ben rubber is 1%, the proportion of the super conductive agent is 1%, and the proportion of the sodium carboxymethyl cellulose is 1%;
as one implementation mode of the invention, in the positive plate of the battery, the positive active powder comprises a lithium iron manganese phosphate material, a super conductive agent and vinylidene fluoride, wherein the proportion of the lithium iron manganese phosphate material is 90%, the proportion of the super conductive agent is 1%, and the proportion of the vinylidene fluoride is 2%;
as one embodiment of the present invention, the PP film thickness is 3um; the PE film thickness is 3um; the thickness of the mixed film of PP+PVDF+ceramic is 3um.
As an embodiment of the invention, the battery electrolyte solvent is one or more of PP, EP, DEC, DMC, EC, PC, in particular PP material.
As an embodiment of the invention, the electrolyte additive consists of one or more of PS, ES, VEC, VC, in particular PS material; the electrolyte lithium salt consists of one or more of LIPF6, LIClO4 and LITFSI, and is specifically LIPF6 material.
Embodiment two:
a method for manufacturing a lithium ion battery, the method comprising:
step S1: fixing a battery positive plate, a battery negative plate and a battery diaphragm in one mode of stacking and winding;
step S2: packaging the fixed battery positive plate, the battery negative plate and the battery diaphragm in an aluminum plastic film of a battery shell;
step S3: and filling electrolyte into the aluminum plastic film of the battery shell, which is packaged with the battery positive plate, the battery negative plate and the battery diaphragm, and carrying out activation, formation, packaging and molding to obtain the lithium ion battery.
As one embodiment of the invention, the battery negative plate comprises negative active powder, copper foil, a negative tab and a super conductive agent; the negative electrode active powder is made of artificial graphite material; the battery positive plate comprises positive active powder, aluminum foil, positive lugs, super conductive agent and adhesive; the positive active powder is lithium iron manganese phosphate.
As one embodiment of the present invention, the Super conductive agent is one or more of Super-P, graphene and carbon nanotubes; the battery diaphragm is one of a PP film, a PE film and a mixed film of PP+PVDF+ceramic; the battery electrolyte consists of a solvent, an additive and lithium salt.
In one embodiment of the invention, the negative electrode active powder comprises graphite material, ding Ben rubber, super conductive agent and sodium carboxymethyl cellulose, wherein the proportion of the graphite material is 95%, the proportion of the Ding Ben rubber is 2%, the proportion of the super conductive agent is 2%, and the proportion of the sodium carboxymethyl cellulose is 2%.
In one embodiment of the invention, the positive electrode active powder material of the battery positive electrode comprises a lithium iron manganese phosphate material, a super conductive agent and vinylidene fluoride, wherein the proportion of the lithium iron manganese phosphate material is 94%, the proportion of the super conductive agent is 2%, and the proportion of the vinylidene fluoride is 3%.
As one embodiment of the present invention, the PP film thickness is 10um; the PE film thickness is 10um; the thickness of the mixed film of PP+PVDF+ceramic is 10um.
As an embodiment of the present invention, the battery electrolyte solvent is one or more of PP, EP, DEC, DMC, EC, PC, in particular EP material.
As an embodiment of the present invention, the electrolyte additive consists of one or more of PS, ES, VEC, VC, in particular ES material; the electrolyte lithium salt consists of one or more of LIPF6, LIClO4 and LITFSI, and is specifically LIClO4 material.
Embodiment III:
a method for manufacturing a lithium ion battery, the method comprising:
step S1: fixing a battery positive plate, a battery negative plate and a battery diaphragm in one mode of stacking and winding;
step S2: packaging the fixed battery positive plate, the battery negative plate and the battery diaphragm in an aluminum plastic film of a battery shell;
step S3: and filling electrolyte into the aluminum plastic film of the battery shell, which is packaged with the battery positive plate, the battery negative plate and the battery diaphragm, and carrying out activation, formation, packaging and molding to obtain the lithium ion battery.
As one embodiment of the invention, the battery negative plate comprises negative active powder, copper foil, a negative tab and a super conductive agent; the negative electrode active powder is made of artificial graphite material; the battery positive plate comprises positive active powder, aluminum foil, positive lugs, super conductive agent and adhesive; the positive active powder is lithium iron manganese phosphate.
As one embodiment of the present invention, the Super conductive agent is one or more of Super-P, graphene and carbon nanotubes; the battery diaphragm is one of a PP film, a PE film and a mixed film of PP+PVDF+ceramic; the battery electrolyte consists of a solvent, an additive and lithium salt.
In one embodiment of the invention, the negative electrode active powder comprises a graphite material, ding Ben rubber, a super-conductive agent and sodium carboxymethyl cellulose, wherein the proportion of the graphite material is 96%, the proportion of the Ding Ben rubber is 3%, the proportion of the super-conductive agent is 3%, and the proportion of the sodium carboxymethyl cellulose is 3%.
In one embodiment of the invention, the positive electrode active powder material of the battery positive electrode comprises a lithium iron manganese phosphate material, a super conductive agent and vinylidene fluoride, wherein the proportion of the lithium iron manganese phosphate material is 96%, the proportion of the super conductive agent is 3%, and the proportion of the vinylidene fluoride is 4%.
As one embodiment of the present invention, the PP film thickness is 25um; the PE film thickness is 25um; the thickness of the mixed film of PP+PVDF+ceramic is 25um.
As an embodiment of the present invention, the battery electrolyte solvent is one or more of PP, EP, DEC, DMC, EC, PC, specifically DEC material.
As an embodiment of the invention, the electrolyte additive consists of one or more of PS, ES, VEC, VC, in particular VEC material; the electrolyte lithium salt consists of one or more of LIPF6, LIClO4 and LITFSI, in particular LITFSI material;
embodiment four:
the manufacturing method of the negative plate comprises the following steps: mixing artificial graphite, ding Ben rubber, a super conductive agent and sodium carboxymethyl cellulose in a ratio of 95:2:1.5:1.5; putting the mixed powder into a stirrer, and stirring for 3 hours by using revolution of 25HZ and rotation of 2000 r/min; the mixed powder after being stirred evenly is prepared by the following dry powder: deionized water is added according to the ratio of 1:1, and 25HZ revolution and 2000r/min rotation are used for stirring for 6 hours; and finally, uniformly coating the prepared slurry on a copper foil, and welding an upper tab to prepare the negative plate.
The manufacturing method of the positive plate comprises the following steps: mixing a lithium iron manganese phosphate material, a super conductive agent and vinylidene fluoride according to the proportion of 96:2:2; putting the mixed powder into a stirrer, and stirring for 3 hours by using revolution of 25HZ and rotation of 2500 r/min; the mixed powder after being stirred evenly is prepared by the following dry powder: adding nitrogen methyl pyrrolidone into water according to the ratio of 1:1, and stirring for 6 hours by using revolution of 25HZ and rotation of 2500 r/min; uniformly coating the prepared slurry on a copper foil, and welding an upper tab to prepare a positive plate;
winding a positive plate and a negative plate into a battery core by using a PE (polyethylene) diaphragm by using a diaphragm, packaging the battery core in an aluminum plastic film, and putting the battery core into an oven for baking until liquid injection is performed;
fifth embodiment:
the manufacturing method of the negative plate comprises the following steps: mixing graphite, ding Ben rubber, a super conductive agent and sodium carboxymethyl cellulose in a ratio of 95:2:1.5:1.5; putting the mixed powder into a stirrer, and stirring for 3 hours by using revolution of 25HZ and rotation of 2000 r/min; the mixed powder after being stirred evenly is prepared by the following dry powder: deionized water is added according to the ratio of 1:1, and 25HZ revolution and 2000r/min rotation are used for stirring for 6 hours; and finally, uniformly coating the prepared slurry on a copper foil, and welding an upper tab to prepare the negative plate.
The manufacturing method of the positive plate comprises the following steps: mixing a lithium iron manganese phosphate material, a super conductive agent and vinylidene fluoride according to the proportion of 96:2:2; putting the mixed powder into a stirrer, and stirring for 3 hours by using revolution of 25HZ and rotation of 2500 r/min; the mixed powder after being stirred evenly is prepared by the following dry powder: adding nitrogen methyl pyrrolidone into water according to the ratio of 1:1, and stirring for 6 hours by using revolution of 25HZ and rotation of 2500 r/min; uniformly coating the prepared slurry on a copper foil, and welding an upper tab to prepare a positive plate;
winding a positive plate and a negative plate into a battery core by using a PE (polyethylene) diaphragm by using a diaphragm, packaging the battery core in an aluminum plastic film, and putting the battery core into an oven for baking until liquid injection is performed;
specifically, the battery separator must encase the battery negative plate, and the battery negative plate must encase the battery positive plate; the super conductive agent layer needs to be interposed between two anode active powder layers, and the anode active powder layers need to completely cover the super conductive agent layer; meanwhile, the number of the anode active layers is required to be an even number, and the number of the anode active layers is equal to the number of the super conductive agent layers and two layers are added; the balance coefficient between the positive plate and the negative plate must be greater than 100%; the positive electrode material must be slurried with an organic aprotic solvent; the humidity of the lithium ion battery pole piece during production is required to be less than 20% RH; the dew point of the lithium ion battery is required to be less than-55 ℃ when the lithium ion battery is injected.
Preparing lithium electronic battery electrolyte: solvent system DMC, additive system PS and lithium salt system LIPF6.
Lithium-ion battery formation:
respectively injecting lithium-ion battery electrolyte into the fourth embodiment and the fifth embodiment, and aging for 24 hours at a high temperature of 45 ℃; after that, 1kg/cm of 2 -2kg/cm 2 ，-10kg/cm 2 -10kg/cm 2 The pressure value is formed for the fourth embodiment and the fifth embodiment;
| sequence number | Step of working | Time/min | current/mA | Upper limit voltage/mV | Lower limit voltage/mV |
| 1 | Rest (SLP) | 2 | |||
| 2 | Constant Current Charging (CC) | 20 | 0.2C | 3700 | |
| 3 | Constant Current Charging (CC) | ～ | 0.5C | Full state of electricity | |
| 4 | Rest (SLP) | 5 | |||
| 5 | Constant current Discharge (DC) | 0.2C | Semi-electric state |
The first efficiencies of the batteries prepared by using the materials in the fourth and fifth examples are shown below:
the number of lithium batteries fabricated by the fabrication method of example 4 was 12, while the number of lithium batteries fabricated by the fabrication method of example 5 was 8;
the battery rate performance prepared by using the materials in the fourth and fifth examples is shown below:
| sequence number | Examples | 1C discharge efficiency |
| 1 | 4 | 85.7％ |
| 2 | 4 | 85.2％ |
| 3 | 4 | 79.8％ |
| 4 | 4 | 83.5％ |
| 5 | 4 | 83.9％ |
| 6 | 4 | 78.5％ |
| 7 | 4 | 82.3％ |
| 8 | 4 | 75.6％ |
| 9 | 4 | 80.4％ |
| 10 | 4 | 90.6％ |
| 11 | 4 | 87.6％ |
| 12 | 4 | 85.3％ |
| 13 | 5 | 82.4％ |
| 14 | 5 | 75.3％ |
| 15 | 5 | 80.4％ |
| 16 | 5 | 79.1％ |
| 17 | 5 | 75.3％ |
| 18 | 5 | 81.5％ |
| 19 | 5 | 78.6％ |
| 20 | 5 | 75.3％ |
The self-discharge performance test table of the battery prepared by using the materials in the fourth and fifth examples is as follows:
| sequence number | Examples | mv/h |
| 1 | 4 | 0.043 |
| 2 | 4 | 0.045 |
| 3 | 4 | 0.058 |
| 4 | 4 | 0.057 |
| 5 | 4 | 0.06 |
| 6 | 4 | 0.037 |
| 7 | 4 | 0.055 |
| 8 | 4 | 0.045 |
| 9 | 4 | 0.064 |
| 10 | 4 | 0.033 |
| 11 | 4 | 0.037 |
| 12 | 4 | 0.049 |
| 13 | 5 | 0.049 |
| 14 | 5 | 0.051 |
| 15 | 5 | 0.047 |
| 16 | 5 | 0.044 |
| 17 | 5 | 0.063 |
| 18 | 5 | 0.033 |
| 19 | 5 | 0.057 |
| 20 | 5 | 0.047 |
The battery prepared by the materials in the fourth and fifth examples has the following cycle properties:
from the above table, in the process of manufacturing the negative electrode sheet, the differences in the first efficiency, the battery multiplying power performance, the battery self-discharge performance and the battery cycle performance of the lithium ion battery prepared by graphite and artificial graphite are reduced, so that the lithium ion battery can be obtained, and the natural graphite can be utilized to replace the artificial graphite through systematic control of the lithium ion battery processing technology, so that the cost of manufacturing the lithium ion battery by enterprises is reduced, and the performance of the lithium ion battery is not reduced.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (8)
1. A manufacturing method of a lithium ion battery is characterized in that: the manufacturing method comprises the following steps:
step S1: fixing a battery positive plate, a battery negative plate and a battery diaphragm in one mode of stacking and winding;
step S2: packaging the fixed battery positive plate, the battery negative plate and the battery diaphragm in an aluminum plastic film of a battery shell;
step S3: and filling electrolyte into the aluminum plastic film of the battery shell, which is packaged with the battery positive plate, the battery negative plate and the battery diaphragm, and carrying out activation, formation, packaging and molding to obtain the lithium ion battery.
2. The method for manufacturing a lithium ion battery according to claim 1, wherein: the battery negative electrode sheet comprises negative electrode active powder, copper foil, negative electrode lugs and super conductive agent; the negative electrode active powder is made of artificial graphite material; the battery positive plate comprises positive active powder, aluminum foil, positive lugs, super conductive agent and adhesive; the positive active powder is lithium iron manganese phosphate.
3. The method for manufacturing a lithium ion battery according to claim 2, wherein: the Super conductive agent is one or more of Super-P, graphene and carbon nano tubes; the battery diaphragm is one of a PP film, a PE film and a mixed film of PP+PVDF+ceramic; the battery electrolyte consists of a solvent, an additive and lithium salt.
4. A method of manufacturing a lithium ion battery according to claim 3, wherein: in the battery negative plate, the negative active powder comprises graphite material, ding Ben rubber, super conductive agent and sodium carboxymethyl cellulose, wherein the proportion of the graphite material is 92% -96%, the proportion of the Ding Ben rubber is 1% -3%, the proportion of the super conductive agent is 1% -3%, and the proportion of the sodium carboxymethyl cellulose is 1% -3%.
5. The method for manufacturing a lithium ion battery according to claim 4, wherein: in the battery positive plate, the positive active powder comprises 90% -96% of lithium iron manganese phosphate material, 1% -3% of super conductive agent and 2% -4% of vinylidene fluoride.
6. The method for manufacturing a lithium ion battery according to claim 5, wherein: the thickness of the PP film is 3um-25um; the thickness of the PE film is 3um-25um; the thickness of the mixed film of the PP+PVDF+ceramic is 3um to 25um.
7. The method for manufacturing a lithium ion battery according to claim 6, wherein: the battery electrolyte solvent is one or more of PP, EP, DEC, DMC, EC, PC.
8. The method for manufacturing a lithium ion battery according to claim 7, wherein: the electrolyte additive consists of one or more of PS, ES, VEC, VC; the electrolyte lithium salt consists of one or more of LIPF6, LIClO4 and LITFSI.
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