CN113540574A - Lithium battery assembly process for heating in-situ solidified electrolyte - Google Patents
Lithium battery assembly process for heating in-situ solidified electrolyte Download PDFInfo
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- CN113540574A CN113540574A CN202110707771.4A CN202110707771A CN113540574A CN 113540574 A CN113540574 A CN 113540574A CN 202110707771 A CN202110707771 A CN 202110707771A CN 113540574 A CN113540574 A CN 113540574A
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- electrolyte
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- heating
- lithium battery
- lithium
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 92
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 56
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 238000010438 heat treatment Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 12
- 238000007789 sealing Methods 0.000 claims abstract description 42
- 229920000642 polymer Polymers 0.000 claims abstract description 25
- 239000000178 monomer Substances 0.000 claims abstract description 23
- 239000003999 initiator Substances 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000002347 injection Methods 0.000 claims abstract description 15
- 239000007924 injection Substances 0.000 claims abstract description 15
- 238000004804 winding Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims description 18
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 14
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 8
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 claims description 8
- STVZJERGLQHEKB-UHFFFAOYSA-N ethylene glycol dimethacrylate Chemical compound CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 7
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 claims description 6
- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 claims description 6
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 5
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 claims description 4
- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 claims description 4
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 claims description 4
- JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical compound CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 claims description 4
- MTLWTRLYHAQCAM-UHFFFAOYSA-N 2-[(1-cyano-2-methylpropyl)diazenyl]-3-methylbutanenitrile Chemical compound CC(C)C(C#N)N=NC(C#N)C(C)C MTLWTRLYHAQCAM-UHFFFAOYSA-N 0.000 claims description 4
- DBCAQXHNJOFNGC-UHFFFAOYSA-N 4-bromo-1,1,1-trifluorobutane Chemical compound FC(F)(F)CCCBr DBCAQXHNJOFNGC-UHFFFAOYSA-N 0.000 claims description 4
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 claims description 4
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 4
- ZQMHJBXHRFJKOT-UHFFFAOYSA-N methyl 2-[(1-methoxy-2-methyl-1-oxopropan-2-yl)diazenyl]-2-methylpropanoate Chemical compound COC(=O)C(C)(C)N=NC(C)(C)C(=O)OC ZQMHJBXHRFJKOT-UHFFFAOYSA-N 0.000 claims description 4
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 claims description 3
- LELOWRISYMNNSU-UHFFFAOYSA-N Hydrocyanic acid Natural products N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 claims description 3
- NHARPDSAXCBDDR-UHFFFAOYSA-N propyl 2-methylprop-2-enoate Chemical compound CCCOC(=O)C(C)=C NHARPDSAXCBDDR-UHFFFAOYSA-N 0.000 claims description 3
- PNXMTCDJUBJHQJ-UHFFFAOYSA-N propyl prop-2-enoate Chemical compound CCCOC(=O)C=C PNXMTCDJUBJHQJ-UHFFFAOYSA-N 0.000 claims description 3
- GIPPRHYVOCDBSQ-UHFFFAOYSA-N COCC(=O)O.C(C=C)(=O)N Chemical compound COCC(=O)O.C(C=C)(=O)N GIPPRHYVOCDBSQ-UHFFFAOYSA-N 0.000 claims description 2
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 2
- OOTFVKOQINZBBF-UHFFFAOYSA-N cystamine Chemical compound CCSSCCN OOTFVKOQINZBBF-UHFFFAOYSA-N 0.000 claims description 2
- 229940099500 cystamine Drugs 0.000 claims description 2
- 239000008151 electrolyte solution Substances 0.000 claims description 2
- VSYIJNDEXXBJFH-UHFFFAOYSA-N 5-isocyanato-2-methylpent-1-en-3-one Chemical compound CC(=C)C(=O)CCN=C=O VSYIJNDEXXBJFH-UHFFFAOYSA-N 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 17
- 229910002804 graphite Inorganic materials 0.000 abstract description 14
- 239000010439 graphite Substances 0.000 abstract description 14
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 6
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 6
- 239000007784 solid electrolyte Substances 0.000 abstract description 6
- 238000007711 solidification Methods 0.000 abstract description 4
- 230000008023 solidification Effects 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 210000001787 dendrite Anatomy 0.000 abstract description 2
- 230000014759 maintenance of location Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 description 28
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 27
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 22
- 239000002033 PVDF binder Substances 0.000 description 20
- 238000002156 mixing Methods 0.000 description 20
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 16
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 12
- 239000011267 electrode slurry Substances 0.000 description 12
- 239000011888 foil Substances 0.000 description 12
- 229910052782 aluminium Inorganic materials 0.000 description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 11
- -1 lithium hexafluorophosphate Chemical group 0.000 description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 239000011889 copper foil Substances 0.000 description 10
- 238000005520 cutting process Methods 0.000 description 10
- 238000001035 drying Methods 0.000 description 10
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 10
- 238000005096 rolling process Methods 0.000 description 10
- 238000001029 thermal curing Methods 0.000 description 10
- 238000003466 welding Methods 0.000 description 10
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 9
- 229910010941 LiFSI Inorganic materials 0.000 description 7
- 229910013716 LiNi Inorganic materials 0.000 description 7
- VDVLPSWVDYJFRW-UHFFFAOYSA-N lithium;bis(fluorosulfonyl)azanide Chemical compound [Li+].FS(=O)(=O)[N-]S(F)(=O)=O VDVLPSWVDYJFRW-UHFFFAOYSA-N 0.000 description 7
- 239000011572 manganese Substances 0.000 description 7
- 238000007664 blowing Methods 0.000 description 6
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000010405 anode material Substances 0.000 description 3
- 238000001723 curing Methods 0.000 description 3
- 229910003002 lithium salt Inorganic materials 0.000 description 3
- 159000000002 lithium salts Chemical class 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910032387 LiCoO2 Inorganic materials 0.000 description 2
- 229910001290 LiPF6 Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 150000002148 esters Chemical group 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 239000011244 liquid electrolyte Substances 0.000 description 2
- 229910001486 lithium perchlorate Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 description 2
- 239000005486 organic electrolyte Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 2
- NFDUZRAWLHASSQ-UHFFFAOYSA-N 2-hydroxyacetic acid;n-methylprop-2-enamide Chemical compound OCC(O)=O.CNC(=O)C=C NFDUZRAWLHASSQ-UHFFFAOYSA-N 0.000 description 1
- UFQDKRWQSFLPQY-UHFFFAOYSA-N 4,5-dihydro-1h-imidazol-3-ium;chloride Chemical compound Cl.C1CN=CN1 UFQDKRWQSFLPQY-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- JVTAAEKCZFNVCJ-UHFFFAOYSA-M Lactate Chemical compound CC(O)C([O-])=O JVTAAEKCZFNVCJ-UHFFFAOYSA-M 0.000 description 1
- 229910013075 LiBF Inorganic materials 0.000 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 229910002099 LiNi0.5Mn1.5O4 Inorganic materials 0.000 description 1
- 229910013872 LiPF Inorganic materials 0.000 description 1
- 101150058243 Lipf gene Proteins 0.000 description 1
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 150000001408 amides Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- YDVJBLJCSLVMSY-UHFFFAOYSA-N carbamoyl cyanide Chemical compound NC(=O)C#N YDVJBLJCSLVMSY-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- FRMOHNDAXZZWQI-UHFFFAOYSA-N lithium manganese(2+) nickel(2+) oxygen(2-) Chemical compound [O-2].[Mn+2].[Ni+2].[Li+] FRMOHNDAXZZWQI-UHFFFAOYSA-N 0.000 description 1
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 description 1
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 description 1
- MCVFFRWZNYZUIJ-UHFFFAOYSA-M lithium;trifluoromethanesulfonate Chemical compound [Li+].[O-]S(=O)(=O)C(F)(F)F MCVFFRWZNYZUIJ-UHFFFAOYSA-M 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- RBQRWNWVPQDTJJ-UHFFFAOYSA-N methacryloyloxyethyl isocyanate Chemical compound CC(=C)C(=O)OCCN=C=O RBQRWNWVPQDTJJ-UHFFFAOYSA-N 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
-
- 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 & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Electrochemistry (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
A lithium battery assembly process for heating in-situ curing electrolyte is characterized in that a polymer monomer and a thermal initiator are added into the electrolyte and uniformly stirred to obtain the electrolyte capable of being heated and cured; assembling the positive plate, the negative plate and the diaphragm together, and winding into a core to obtain a battery core; the battery core is arranged in the shell to complete top sealing and side sealing, so that a soft package battery without liquid injection is formed; and injecting the electrolyte capable of being cured by heating into the soft package battery, sealing, and heating the electrolyte to cure to obtain the lithium battery. The electrolyte is heated to initiate in-situ solidification after the lithium battery is packaged, so that good contact between the solid electrolyte and the electrode is ensured, the formation of lithium dendrites can be reduced, and the service life of the battery is prolonged. The lithium ion battery assembled by the invention has better cycle performance and rate capability. Taking the NCM 523/graphite battery as an example, the capacity retention rate after 100 cycles is 98-99.8%, and the better cycle stability is shown.
Description
Technical Field
The invention relates to a lithium battery assembly process for heating in-situ solidified electrolyte, and belongs to the field of lithium battery assembly.
Background
With the increasing demand of energy in the current market and the high attention of the current situation on clean energy, the field of lithium ion batteries has become a hot point of research. At present, the most widely used lithium battery electrolyte is an organic liquid electrolyte, but there are many potential safety hazards in the practical application process, mainly because the organic electrolyte components are easy to volatilize and leak under extreme conditions, and are easy to cause safety accidents such as fire and explosion.
Compared with organic electrolyte, the solid electrolyte has the advantages of higher safety, better thermal stability, good machining performance and the like. However, in practical application, the application of the solid electrolyte is still limited due to the complexity of the preparation process and the disadvantage of low ionic conductivity at room temperature. The method for upgrading the commercial liquid electrolyte into the solid electrolyte is a simpler and easier method for improving the safety of the commercial electrolyte, and the solid state upgrading of the electrolyte is realized by adding a small amount of polymer into the commercial electrolyte, so that the raw material cost for preparing the electrolyte is greatly saved. However, the processing steps of diaphragm modification, liquid absorption, ultraviolet light-initiated polymerization, positive and negative electrode modification and the like can not be separated in the conventional method, so that the processing flow of the lithium battery is greatly complicated, and the process cost is increased.
Therefore, a new electrolyte solidification upgrading idea is needed to be provided, and the processing flow of the lithium battery is simplified, so that conditions are provided for the safe popularization of the lithium ion battery.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a lithium battery assembling process for heating in-situ solidified electrolyte. The lithium battery can be assembled by only adding two steps of preparation of the curable electrolyte and heating and curing after the lithium battery is packaged, the process is simple and feasible, the operation is convenient, and the method can be applied to large-scale production.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a lithium battery assembly process for heating in-situ solidified electrolyte comprises the following steps:
s1, adding a polymer monomer and a thermal initiator into the electrolyte, and uniformly stirring to obtain the electrolyte capable of being cured by heating;
assembling the positive plate, the negative plate and the diaphragm together, and winding into a core to obtain a battery core;
s2, the battery cell is arranged in the shell to complete top sealing and side sealing, and a soft package battery without liquid injection is formed;
and S3, injecting the electrolyte capable of being cured by heating into a soft package battery, sealing, and heating the electrolyte to cure to obtain the lithium battery.
The invention further improves that the polymer monomer is one or two of methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, dimethylaminoethyl methacrylate, hydroxyethyl methacrylate, polyethylene glycol dimethacrylate, itaconic acid, maleic anhydride, methyl acrylamide glycolate, 2-methacryloyloxyethyl isocyanate, 2- (1-ethyleneimine) ethyl methacrylate, N' -bisacryloyl cystamine, N-methylenebisacrylamide, triallyl isocyanurate and ethylene glycol dimethacrylate.
In a further improvement of the present invention, the thermal initiator is one of azobisisobutyronitrile, azobisisovaleronitrile, azobisisoheptonitrile, azobisisobutyronitrile formamide, azobisdicyclohexylcarbonitrile, dimethyl azobisisobutyrate, azobisisobutyramidine hydrochloride, azobisisopropylimidazoline hydrochloride, and azobiscyanovaleric acid.
In a further development of the invention, in step S1, the concentration by mass of the polymer monomer in the heat-curable electrolyte is 10 to 25%.
In a further development of the invention, in step S1, the thermal initiator is present in the heat-curable electrolyte in a mass concentration of 0.1 to 0.25%.
The invention is further improved in that in the step S1, the stirring time is 0.5-6 h; the stirring temperature is 25-45 ℃.
The invention further improves the method that in the step S3, the heating temperature is 50-110 ℃, and the heating time is 3-24 h.
A lithium battery made according to the assembly process described above.
Compared with the prior art, the invention has the beneficial effects that: on the basis of the mature lithium battery assembly process, the invention only adds two steps of preparation of the curable electrolyte and heating and curing after the lithium battery is packaged, has simple and feasible process and convenient operation, and can be applied to large-scale production. The electrolyte is heated to initiate in-situ solidification after the lithium battery is packaged, so that good contact between the solid electrolyte and the electrode is ensured, the formation of lithium dendrites can be reduced, and the service life of the battery is prolonged. The lithium ion battery assembled by the invention has better cycle performance and rate capability. Taking the NCM 523/graphite battery as an example, the capacity retention rate after 100 cycles is 98-99.8%, and the better cycle stability is shown.
Furthermore, the proportion of the polymer monomer in the prepared curable electrolyte is low, so that the high ionic conductivity of the cured solid electrolyte is ensured.
Furthermore, the polymer formed by heating the electrolyte contains functional groups such as carboxyl, hydroxyl, ester, amide and the like, so that the thermal stability, electrochemical window, hydrophilicity, ionic conductivity and other characteristics of the electrolyte can be improved, and the electrolyte is matched with a high-voltage positive electrode material, namely ternary NCM811, lithium cobaltate and lithium nickel manganese oxide, so that the energy density of the battery is improved.
Drawings
Fig. 1 is a graph showing discharge capacity and coulombic efficiency of a lithium battery prepared according to example 1 of the present invention.
Fig. 2 is a graph showing the discharge capacity and the coulombic efficiency of the lithium battery prepared in example 2 according to the present invention.
Fig. 3 is a graph showing the discharge capacity and coulombic efficiency of a lithium battery prepared according to example 3 of the present invention.
Detailed Description
The invention is further described in the following description with reference to the figures and specific preferred embodiments, but without thereby limiting the scope of protection of the invention. The examples are preferred in the experimental process and are only used for more complete illustration of the present invention, but are not to be construed as limiting the scope of the present invention.
The instruments and drug materials used in the present invention are commercially available.
First, the electrolyte solution of the present invention which can be cured by heating will be described.
In the present invention, an electrolyte is provided which can be cured by heating, the electrolyte comprising: commercial electrolyte, polymer monomer and initiator.
The conductive lithium salt in the commercial electrolyte is lithium hexafluorophosphate (LiPF)6) Lithium perchlorate (LiCiO)4) Lithium tetrafluoroborate (LiBF)4) And lithium trifluoromethanesulfonate (LiFSI), wherein the solvent is one or more of Ethylene Carbonate (EC), Propylene Carbonate (PC), dimethyl carbonate (DEC), diethyl carbonate (DMC) and Ethyl Methyl Carbonate (EMC).
Preferably, the concentration of the conductive lithium salt in the electrolyte is 1 mol/L. The solute in the commercial electrolyte is conductive lithium salt LiPF6The solvent is ethylene carbonate, dimethyl carbonate and diethyl carbonate (volume ratio is 1:1: 1).
The polymer monomer is one or two of methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, dimethylaminoethyl methacrylate, hydroxyethyl methacrylate, polyethylene glycol dimethacrylate, itaconic acid, maleic anhydride, acrylamide glycolic acid methyl ether, 2-methacryloyl isocyanate oxyethyl ester, 2- (1-ethyleneimine) ethyl methacrylate, N' -bisacrylamide, N-methylenebisacrylamide, triallyl isocyanurate and ethylene glycol dimethacrylate.
The thermal initiator is one of azobisisobutyronitrile, azobisisovaleronitrile, azobisisoheptonitrile, azobisisobutyronitrile formamide, azobiscyclohexylcarbonitrile, dimethyl azobisisobutyrate, azobisisobutyramidine hydrochloride, azobisisopropylimidazoline hydrochloride and azobiscyanovaleric acid.
Next, a lithium battery assembly process based on a curable electrolyte is described.
The invention provides a lithium battery assembly process for heating in-situ solidified electrolyte, which specifically comprises the following steps:
s1, preparing electrolyte: adding a polymer monomer and a thermal initiator into the electrolyte, and uniformly stirring to obtain a heat-curable electrolyte;
the total concentration of the modifier monomer in the mixed solution is 10-25 wt%, and the concentration of the thermal initiator in the mixed solution is 0.1-0.25 wt%.
The mixed solution containing the polymer monomer and the thermal initiator is stirred for sufficient mixing. The stirring method is not particularly required, and may be selected according to the actual conditions. For example, in embodiments of the present invention, mechanical agitation is used. The stirring time and temperature are not particularly required, and in the embodiment of the present invention, the preferable stirring time is 0.5 to 6 hours; stirring is carried out at 25-45 ℃.
S2, preparing a battery cell: assembling the positive and negative pole pieces and the diaphragm together, and winding the positive and negative pole pieces and the diaphragm into a core to obtain a battery core;
the positive plate comprises a positive current collector, a positive active material coated on the positive current collector, a positive conductive agent and a binder. The positive current collector can be selected from aluminum foil, nickel foil, carbon foil or stainless steel sheet; the positive electrode active material may be selected according to the actual LiCoO2、LiFePO4、NCM523、NCM811、LiNi0.5Mn1.5O4And the like cathode materials; the positive electrode conductive agent can be acetylene black, graphite, Super P or conductive fiber according to actual selection.
The anode material to be applied according to the present invention may be selected according to the actual. For example, the anode is a lithium metal-based anode material or a carbon-based anode material.
S3, assembling the soft package battery: the battery core is arranged in the shell to complete top sealing and side sealing, so that a soft package battery without liquid injection is formed;
s4, liquid injection and solidification: and injecting the electrolyte into the soft package battery, sealing, and heating the lithium battery at a certain temperature to solidify the electrolyte in the lithium battery to obtain the solid-state upgraded lithium battery.
The heating temperature has no special requirement and can be adjusted according to the actual requirement. For example, in embodiments of the present invention, the heating temperature is 50-110 ℃.
The heating time has no special requirements and can be adjusted according to actual requirements. For example, in the examples of the present invention, the heating time is 3 to 24 hours.
The present invention will be described in more detail with reference to examples.
Example 1
A lithium battery assembly process for heating in-situ solidified electrolyte comprises the following steps:
firstly, dissolving polymer monomers of methyl methacrylate, polyethylene glycol dimethacrylate and thermal initiator of azodiisoheptonitrile into electrolyte respectively in mass fractions of 5 wt%, 10 wt% and 0.15 wt%, wherein the electrolyte is 1mol/L LiPF6Ethylene Carbonate (EC)/diethyl carbonate (DEC)/dimethyl carbonate (DMC) (volume ratio 1:1: 1). Mechanically stirred at 25 ℃ for 1h to obtain the electrolyte with thermocuring capability.
Mixing NCM523, Super P, PVDF (polyvinylidene fluoride) and NMP in a mass ratio of 8:1:1 to obtain positive slurry, and coating the positive slurry on an aluminum foil; the negative electrode slurry was obtained by mixing graphite, Super P, PVDF, 8:1:1 in NMP in a mass ratio, and the slurry was coated on a copper foil. Drying, rolling and cutting to obtain the positive and negative pole pieces.
And then, placing the diaphragm between the positive and negative pole pieces according to a conventional lithium battery assembly process, welding the lugs, and winding into a core to obtain the battery core.
And (3) putting the battery core into the shell, bonding, and then finishing top sealing and side sealing to form the soft package battery without liquid injection.
And injecting the prepared electrolyte into a soft package battery, then exhausting, sealing, and heating in a constant-temperature blowing oven at 60 ℃ for 3h to obtain the solid-state upgraded lithium battery.
Example 2
Firstly, polymer monomer of dimethylaminoethyl methacrylate is polymerized2-methacryloyloxyethyl isocyanate and a thermal initiator azobisisobutyronitrile are respectively dissolved in electrolyte with the mass fractions of 2.5 wt%, 7.5 wt% and 0.1 wt%, wherein the electrolyte is selected to be 1mol/L LiClO4Ethylene Carbonate (EC)/diethyl carbonate (DEC)/Ethyl Methyl Carbonate (EMC) (volume ratio 1:1: 1). Mechanically stirring at 30 ℃ for 2h to obtain the electrolyte with thermocuring capability.
Mixing NCM811, Super P, PVDF (polyvinylidene fluoride) and NMP in a mass ratio of 8:1:1 to obtain positive electrode slurry, and coating the positive electrode slurry on an aluminum foil; the negative electrode slurry was obtained by mixing graphite, Super P, PVDF, 8:1:1 in NMP in a mass ratio, and the slurry was coated on a copper foil. Drying, rolling and cutting to obtain the positive and negative pole pieces.
And then, placing the diaphragm between the positive and negative pole pieces according to a conventional lithium battery assembly process, welding the lugs, and winding into a core to obtain the battery core.
And (3) putting the battery core into the shell, bonding, and then finishing top sealing and side sealing to form the soft package battery without liquid injection.
And injecting the prepared electrolyte into a soft package battery, then exhausting, sealing, and heating for 6 hours in a constant-temperature air blast oven at 80 ℃ to obtain the solid-state upgraded lithium battery.
Example 3
Firstly, polymer monomers of hydroxyethyl methacrylate, N-methylene bisacrylamide and a thermal initiator of azodicyclohexyl formonitrile are dissolved in electrolyte respectively according to the mass fractions of 12.5 wt%, 12.5 wt% and 0.25 wt%, wherein the electrolyte is selected from 1mol/L LiFSI/Ethylene Carbonate (EC)/diethyl carbonate (DEC)/Ethyl Methyl Carbonate (EMC) (volume ratio of 1:1: 1). Mechanically stirred at 45 ℃ for 4h to obtain the electrolyte with thermocuring capability.
According to the mass ratio LiCoO2Mixing PVDF (polyvinylidene fluoride) in NMP (N-methyl pyrrolidone) to obtain positive slurry, and coating the positive slurry on an aluminum foil; the negative electrode slurry was obtained by mixing graphite, Super P, PVDF, 8:1:1 in NMP in a mass ratio, and the slurry was coated on a copper foil. Drying, rolling and cutting to obtain the positive and negative pole pieces.
And then, placing the diaphragm between the positive and negative pole pieces according to a conventional lithium battery assembly process, welding the lugs, and winding into a core to obtain the battery core.
And (3) putting the battery core into the shell, bonding, and then finishing top sealing and side sealing to form the soft package battery without liquid injection.
And injecting the prepared electrolyte into a soft package battery, then exhausting, sealing, and heating in a constant-temperature blowing oven at 85 ℃ for 12h to obtain the solid-state upgraded lithium battery.
Example 4
Firstly, polymer monomers of butyl acrylate, 2- (1-ethyleneimine) ethyl methacrylate and thermal initiator of azodicyclohexyl carbonitrile are dissolved in electrolyte with the mass fractions of 10 wt%, 5 wt% and 0.15 wt%, respectively, wherein the electrolyte is selected from 1 mol/LLIFSI/Propylene Carbonate (PC)/diethyl carbonate (DEC)/dimethyl carbonate (DMC) (volume ratio 1:1: 1). And mechanically stirring the mixture for 6 hours at 25 ℃ to obtain the electrolyte with the thermocuring capability.
LiNi according to mass ratio0.5Mn1.5O4Mixing PVDF (polyvinylidene fluoride) in NMP (N-methyl pyrrolidone) to obtain positive slurry, and coating the positive slurry on an aluminum foil; the negative electrode slurry was obtained by mixing graphite, Super P, PVDF, 8:1:1 in NMP in a mass ratio, and the slurry was coated on a copper foil. Drying, rolling and cutting to obtain the positive and negative pole pieces.
And then, placing the diaphragm between the positive and negative pole pieces according to a conventional lithium battery assembly process, welding the lugs, and winding into a core to obtain the battery core.
And (3) putting the battery core into the shell, bonding, and then finishing top sealing and side sealing to form the soft package battery without liquid injection.
And injecting the prepared electrolyte into a soft package battery, then exhausting, sealing, and heating in a constant-temperature air blast oven at 65 ℃ for 8h to obtain the solid-state upgraded lithium battery.
Example 5
Firstly, a polymer monomer methyl acrylate and a thermal initiator azobisisovaleronitrile are respectively dissolved in an electrolyte with the mass fraction of 25 wt% and 0.1 wt%, wherein the electrolyte is selected from 1mol/L LiFSI/Propylene Carbonate (PC)/diethyl carbonate (DEC)/dimethyl carbonate (DMC) (volume ratio is 1:1: 1). Mechanically stirring at 35 ℃ for 0.5h to obtain the electrolyte with thermocuring capability.
LiNi according to mass ratio0.5Mn1.5O4Mixing PVDF (polyvinylidene fluoride) in NMP (N-methyl pyrrolidone) to obtain positive slurry, and coating the positive slurry on an aluminum foil; the negative electrode slurry was obtained by mixing graphite, Super P, PVDF, 8:1:1 in NMP in a mass ratio, and the slurry was coated on a copper foil. Drying, rolling and cutting to obtain the positive and negative pole pieces.
And then, placing the diaphragm between the positive and negative pole pieces according to a conventional lithium battery assembly process, welding the lugs, and winding into a core to obtain the battery core.
And (3) putting the battery core into the shell, bonding, and then finishing top sealing and side sealing to form the soft package battery without liquid injection.
And injecting the prepared electrolyte into a soft package battery, then exhausting, sealing, and heating in a constant-temperature blowing oven at 50 ℃ for 24 hours to obtain the solid-state upgraded lithium battery.
Example 6
Firstly, polymer monomers of itaconic acid, maleic anhydride and thermal initiator azodicyano valeric acid are respectively dissolved in electrolyte with the mass fractions of 10 wt%, 10% and 0.2%, wherein the electrolyte is selected from 1mol/L LiFSI/Propylene Carbonate (PC)/diethyl carbonate (DEC)/dimethyl carbonate (DMC) (the volume ratio is 1:1: 1). And mechanically stirring the mixture for 5 hours at the temperature of 30 ℃ to obtain the electrolyte with the thermocuring capability.
LiNi according to mass ratio0.5Mn1.5O4Mixing PVDF (polyvinylidene fluoride) in NMP (N-methyl pyrrolidone) to obtain positive slurry, and coating the positive slurry on an aluminum foil; the negative electrode slurry was obtained by mixing graphite, Super P, PVDF, 8:1:1 in NMP in a mass ratio, and the slurry was coated on a copper foil. Drying, rolling and cutting to obtain the positive and negative pole pieces.
And then, placing the diaphragm between the positive and negative pole pieces according to a conventional lithium battery assembly process, welding the lugs, and winding into a core to obtain the battery core.
And (3) putting the battery core into the shell, bonding, and then finishing top sealing and side sealing to form the soft package battery without liquid injection.
And injecting the prepared electrolyte into a soft package battery, then exhausting, sealing, and heating for 3h in a constant-temperature blowing oven at 110 ℃ to obtain the solid-state upgraded lithium battery.
Example 7
Firstly, a polymer monomer of acrylamide, methyl glycolate and thermal initiator of azo-isobutyryl cyano formamide are dissolved in electrolyte respectively in mass fractions of 7 wt% and 0.25 wt%, wherein the electrolyte is selected from 1mol/L LiFSI/Propylene Carbonate (PC)/diethyl carbonate (DEC)/dimethyl carbonate (DMC) (volume ratio is 1:1: 1). And mechanically stirring the mixture for 3 hours at 40 ℃ to obtain the electrolyte with the thermocuring capability.
LiNi according to mass ratio0.5Mn1.5O4Mixing PVDF (polyvinylidene fluoride) in NMP (N-methyl pyrrolidone) to obtain positive slurry, and coating the positive slurry on an aluminum foil; the negative electrode slurry was obtained by mixing graphite, Super P, PVDF, 8:1:1 in NMP in a mass ratio, and the slurry was coated on a copper foil. Drying, rolling and cutting to obtain the positive and negative pole pieces.
And then, placing the diaphragm between the positive and negative pole pieces according to a conventional lithium battery assembly process, welding the lugs, and winding into a core to obtain the battery core.
And (3) putting the battery core into the shell, bonding, and then finishing top sealing and side sealing to form the soft package battery without liquid injection.
And injecting the prepared electrolyte into a soft package battery, then exhausting, sealing, and heating for 5 hours in a constant-temperature blowing oven at 90 ℃ to obtain the solid-state upgraded lithium battery.
Example 8
Firstly, polymer monomers of N, N-methylene bisacrylamide, triallyl isocyanurate and thermal initiator of dimethyl azodiisobutyrate are dissolved in electrolyte respectively with the mass fractions of 7 wt%, 8 wt% and 0.15 wt%, wherein the electrolyte is selected to be 1 mol/LLIFSI/Propylene Carbonate (PC)/diethyl carbonate (DEC)/dimethyl carbonate (DMC) (volume ratio is 1:1: 1). Mechanically stirred at 35 ℃ for 2h to obtain the electrolyte with thermocuring capability.
LiNi according to mass ratio0.5Mn1.5O4Mixing PVDF (polyvinylidene fluoride) in NMP (N-methyl pyrrolidone) to obtain positive slurry, and coating the positive slurry on an aluminum foil; according to the mass ratio of graphite to Super P to PVDF to 8 to 1 in NMPMixing to obtain negative electrode slurry, and coating the slurry on a copper foil. Drying, rolling and cutting to obtain the positive and negative pole pieces.
And then, placing the diaphragm between the positive and negative pole pieces according to a conventional lithium battery assembly process, welding the lugs, and winding into a core to obtain the battery core.
And (3) putting the battery core into the shell, bonding, and then finishing top sealing and side sealing to form the soft package battery without liquid injection.
And injecting the prepared electrolyte into a soft package battery, then exhausting, sealing, and heating for 15h in a constant-temperature blast oven at 70 ℃ to obtain the solid-state upgraded lithium battery.
Example 9
Firstly, polymer monomer ethylene glycol dimethacrylate and thermal initiator azobisisobutyramidine hydrochloride are respectively dissolved in electrolyte with the mass fraction of 18 wt% and 0.12 wt%, wherein the electrolyte is selected to be 1mol/L LiFSI/Propylene Carbonate (PC)/diethyl carbonate (DEC)/dimethyl carbonate (DMC) (volume ratio is 1:1: 1). And mechanically stirring the mixture for 6 hours at 25 ℃ to obtain the electrolyte with the thermocuring capability.
LiNi according to mass ratio0.5Mn1.5O4Mixing PVDF (polyvinylidene fluoride) in NMP (N-methyl pyrrolidone) to obtain positive slurry, and coating the positive slurry on an aluminum foil; the negative electrode slurry was obtained by mixing graphite, Super P, PVDF, 8:1:1 in NMP in a mass ratio, and the slurry was coated on a copper foil. Drying, rolling and cutting to obtain the positive and negative pole pieces.
And then, placing the diaphragm between the positive and negative pole pieces according to a conventional lithium battery assembly process, welding the lugs, and winding into a core to obtain the battery core.
And (3) putting the battery core into the shell, bonding, and then finishing top sealing and side sealing to form the soft package battery without liquid injection.
And injecting the prepared electrolyte into a soft package battery, then exhausting, sealing, and heating in a constant-temperature air blast oven at 65 ℃ for 8h to obtain the solid-state upgraded lithium battery.
Example 10
Firstly, polymer monomers of butyl acrylate, 2- (1-ethyleneimine) ethyl methacrylate and azodiisopropyl imidazoline hydrochloric acid serving as a thermal initiator are dissolved in electrolyte according to the mass fractions of 10 wt%, 5 wt% and 0.15 wt%, wherein the electrolyte is 1mol/L LiFSI/Propylene Carbonate (PC)/diethyl carbonate (DEC)/dimethyl carbonate (DMC) (volume ratio is 1:1: 1). And mechanically stirring the mixture for 2 hours at 40 ℃ to obtain the electrolyte with the thermocuring capability.
LiNi according to mass ratio0.5Mn1.5O4Mixing PVDF (polyvinylidene fluoride) in NMP (N-methyl pyrrolidone) to obtain positive slurry, and coating the positive slurry on an aluminum foil; the negative electrode slurry was obtained by mixing graphite, Super P, PVDF, 8:1:1 in NMP in a mass ratio, and the slurry was coated on a copper foil. Drying, rolling and cutting to obtain the positive and negative pole pieces.
And then, placing the diaphragm between the positive and negative pole pieces according to a conventional lithium battery assembly process, welding the lugs, and winding into a core to obtain the battery core.
And (3) putting the battery core into the shell, bonding, and then finishing top sealing and side sealing to form the soft package battery without liquid injection.
And injecting the prepared electrolyte into a soft package battery, then exhausting, sealing, and heating in a constant-temperature blowing oven at 55 ℃ for 20 hours to obtain the solid-state upgraded lithium battery.
And (3) performance testing:
and (3) charge and discharge test: the lithium ion batteries obtained in the examples 1 to 3 and upgraded by curing were tested, and were charged and discharged at a current of 1C with the NCM523 as the positive electrode, graphite as the negative electrode, and a charge-discharge interval of 2.8 to 4.2V. Referring to fig. 1, fig. 2 and fig. 3, the lithium ion batteries of examples 1-3 still have a specific discharge capacity of 130-140mAh/g after 100 charge-discharge cycles at a current density of 1C, which indicates that the electrolyte has high ionic conductivity and good interface compatibility.
Claims (8)
1. A lithium battery assembly process for heating in-situ solidified electrolyte is characterized by comprising the following steps:
s1, adding a polymer monomer and a thermal initiator into the electrolyte, and uniformly stirring to obtain the electrolyte capable of being cured by heating;
assembling the positive plate, the negative plate and the diaphragm together, and winding into a core to obtain a battery core;
s2, the battery cell is arranged in the shell to complete top sealing and side sealing, and a soft package battery without liquid injection is formed;
and S3, injecting the electrolyte capable of being cured by heating into a soft package battery, sealing, and heating the electrolyte to cure to obtain the lithium battery.
2. A lithium battery assembly process with heating of in-situ solidified electrolyte according to claim 1, the polymer is characterized in that the polymer monomer is one or two of methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, dimethylaminoethyl methacrylate, hydroxyethyl methacrylate, polyethylene glycol dimethacrylate, itaconic acid, maleic anhydride, acrylamide glycolic acid methyl ether, 2-methacryloyl ethyl isocyanate, 2- (1-ethyleneimine) ethyl methacrylate, N' -bisacryloyl cystamine, N-methylenebisacrylamide, triallyl isocyanurate and ethylene glycol dimethacrylate.
3. The process of claim 1, wherein the thermal initiator is one of azobisisobutyronitrile, azobisisovaleronitrile, azobisisoheptonitrile, azobisisobutyronitrile, azobisdicyclohexyl formamide, azobiscyclohexyl carbonitrile, dimethyl azobisisobutyrate, azobisisobutyramidine hydrochloride, azobisisopropylimidazoline hydrochloride, and azobiscyanovaleric acid.
4. The process of claim 1, wherein in step S1, the concentration of the polymer monomer in the electrolyte solution is 10-25% by mass.
5. The process of claim 1 or 4, wherein in step S1, the thermal initiator in the heat-curable electrolyte has a mass concentration of 0.1-0.25%.
6. The process of claim 1, wherein in step S1, the stirring time is 0.5-6 h; the stirring temperature is 25-45 ℃.
7. The process of claim 1, wherein in step S3, the heating temperature is 50-110 ℃ and the heating time is 3-24 h.
8. A lithium battery produced by the assembly process according to any one of claims 1 to 7.
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