CN103427118A - Electrode assembly and manufacturing method thereof - Google Patents
Electrode assembly and manufacturing method thereof Download PDFInfo
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- CN103427118A CN103427118A CN2012101876998A CN201210187699A CN103427118A CN 103427118 A CN103427118 A CN 103427118A CN 2012101876998 A CN2012101876998 A CN 2012101876998A CN 201210187699 A CN201210187699 A CN 201210187699A CN 103427118 A CN103427118 A CN 103427118A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 49
- 239000003292 glue Substances 0.000 claims abstract description 48
- 239000002904 solvent Substances 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 39
- 239000000126 substance Substances 0.000 claims description 70
- 238000010030 laminating Methods 0.000 claims description 49
- 230000004888 barrier function Effects 0.000 claims description 46
- -1 cyclic carbonate compounds Chemical class 0.000 claims description 31
- 150000002170 ethers Chemical class 0.000 claims description 30
- 150000001875 compounds Chemical class 0.000 claims description 29
- 150000002148 esters Chemical class 0.000 claims description 15
- 239000004593 Epoxy Chemical class 0.000 claims description 14
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 13
- 238000001125 extrusion Methods 0.000 claims description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract 2
- 238000004804 winding Methods 0.000 abstract 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 11
- 239000003792 electrolyte Substances 0.000 description 10
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 10
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 8
- 229920006395 saturated elastomer Polymers 0.000 description 8
- 239000004215 Carbon black (E152) Substances 0.000 description 7
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 229930195733 hydrocarbon Natural products 0.000 description 7
- 150000002430 hydrocarbons Chemical class 0.000 description 7
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 6
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 6
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 6
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 6
- JWUJQDFVADABEY-UHFFFAOYSA-N 2-methyltetrahydrofuran Chemical compound CC1CCCO1 JWUJQDFVADABEY-UHFFFAOYSA-N 0.000 description 5
- RJUFJBKOKNCXHH-UHFFFAOYSA-N Methyl propionate Chemical compound CCC(=O)OC RJUFJBKOKNCXHH-UHFFFAOYSA-N 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000007731 hot pressing Methods 0.000 description 5
- 229940017219 methyl propionate Drugs 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 230000010412 perfusion Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 238000012407 engineering method Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 150000001721 carbon Chemical group 0.000 description 2
- 125000005587 carbonate group Chemical group 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 2
- 125000004185 ester group Chemical group 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
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- 238000012827 research and development Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- SEZHLKZEWYFCRB-UHFFFAOYSA-N 1,2-dimethoxyethane;oxolane Chemical compound C1CCOC1.COCCOC SEZHLKZEWYFCRB-UHFFFAOYSA-N 0.000 description 1
- 125000006091 1,3-dioxolane group Chemical class 0.000 description 1
- PNWSHHILERSSLF-UHFFFAOYSA-N 4-methylbenzene-1,3-dicarboxylic acid Chemical compound CC1=CC=C(C(O)=O)C=C1C(O)=O PNWSHHILERSSLF-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
- 102000004310 Ion Channels Human genes 0.000 description 1
- 229910013872 LiPF Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 101150058243 Lipf gene Proteins 0.000 description 1
- 230000018199 S phase Effects 0.000 description 1
- 125000003342 alkenyl group Chemical group 0.000 description 1
- 125000000304 alkynyl group Chemical group 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- SIXOAUAWLZKQKX-UHFFFAOYSA-N carbonic acid;prop-1-ene Chemical compound CC=C.OC(O)=O SIXOAUAWLZKQKX-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002931 mesocarbon microbead Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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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
- 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
Abstract
The invention relates to an electrode group and a manufacturing method thereof. The electrode group comprises a positive electrode, a negative electrode, an isolating film inserted between the positive electrode and the negative electrode, and a bonding adhesive arranged between the positive electrode and the isolating film and between the negative electrode and the isolating film. The adhesive includes a high viscosity solvent, and optionally a low viscosity solvent. When the electrode group is manufactured, the bonding glue is used for bonding the positive electrode and the negative electrode to the isolating film respectively, so that the conventional process of stacking or winding the electrode and the isolating film by a stacking machine or a winding machine is omitted, the conventional electrode group manufacturing process is simplified, and the manufacturing cost is reduced.
Description
Technical field
The invention relates to a kind of electrode group and method for making thereof, especially refer to a kind of method for making is simple and cost of manufacture is low electrode group and method for making thereof.
Background technology
In recent years, because of the development of running gear correlation technique and continuing to increase of demand thereof, for example: portable computer, portable telephone and Video Camera etc., be applicable to be inclined to gradually high capacitance, miniaturization, lightweight and extra-thin demand as the secondary cell of Portable electric appliance product power supply.Research and development along with serondary lithium battery, in the secondary cell kind, the research and development of its serondary lithium battery wherein there is high voltage, long-life, high-energy-density with serondary lithium battery again, so, in the secondary cell kind, can reach commercialization and sale.
Secondary cell is the structure with an electrode group, and its electrode group comprises negative pole, anodal and between interelectrode barrier film, and this electrode group is packaged in a battery case.The electrode group can be divided into convoluted and stacked.Negative pole is made with anodal in the two sides that wherein convoluted system coats lengthy motion picture type electric current collection paper tinsel by electrode active material, and barrier film is inserted in to negative pole and positive interpolar is curling forms, stacked is for to coat by electrode active material the two sides that predetermines big or small electric current collection paper tinsel, to make a plurality of negative poles and positive pole, and barrier film is inserted between positive pole and negative pole and sequentially stacked in layers form.
And when manufacturing the required electrode group of secondary cell, the stacked electrode group of take is example, with battery capacity, direct relation is arranged because the electrode group is stacking, thus usually need the stacker of collocation one automation make anodal 1 and negative pole 3 can be suitable staggered and neatly stacking with barrier film 2, as shown in Figure 1.Yet use stacker stacked electrodes group still inevitably may occur that the arrangement of electrode group is uneven, cause the not good formation defective of battery capacity consistency, in addition, in situation about day by day increasing in the demand of high electric weight, microminiaturized battery, use stacker to manufacture the electrode group and will improve the manufacture degree of difficulty, thereby cause the cost of processing procedure and degree of difficulty to increase.
Therefore, simplify electrode group manufacturing process, thereby make its manufacturing cost and degree of difficulty descend, reduce and arrange the uneven defective formed because of the electrode group, and and then provide the operation of a simple and easy stacked electrodes to be beneficial to tight stacked electrodes, reality has its necessity.
Summary of the invention
The object of the present invention is to provide a kind of glue of the laminating for the manufacture of the electrode group, to simplify, have the inconvenience in electrode group manufacturing process now and reduce its manufacturing cost.
Another object of the present invention is to provides a kind of electrode group manufacturing process in conjunction with above-mentioned laminating glue, to simplify the inconvenience in existing electrode group manufacturing process and to reduce its manufacturing cost.
For achieving the above object, electrode group provided by the invention comprises:
One positive pole;
One negative pole;
One barrier film, be inserted between this positive pole and this negative pole; And
One laminating glue, be placed between this positive pole and this barrier film and reach between this negative pole and this barrier film, so that this positive pole and this negative pole are fitted in respectively to this barrier film, wherein this laminating glue comprises the high viscosity solvent of a viscosity higher than 1cP, the group that it selects free cyclic carbonate compounds, lactone compound and combination thereof to form.
Described electrode group, wherein, this laminating glue comprises the low-viscosity solvent of a viscosity lower than 1cP, the group that it selects free chain bis ether compounds, ring-type bis ether compounds, epoxy compounds, chain ester type compound, linear carbonate compounds and combination thereof to form.
Described electrode group, wherein, this cyclic carbonate compounds has the structure shown in following Chemical formula 1, and this lactone compound has the structure shown in following Chemical formula 2:
[Chemical formula 2]
Wherein, R
1For C
1-C
6Alkyl, the integer that n is 1 to 3, the integer that m is 0 to 8, and the p integer that is 0 to 10.
Described electrode group, wherein, this chain bis ether compounds has the structure shown in following chemical formula 3, this ring-type bis ether compounds has the structure shown in following chemical formula 4, this epoxy compounds has the structure shown in following chemical formula 5, this chain ester type compound has the structure shown in following chemical formula 6, and this linear carbonate compounds has the structure shown in following chemical formula 7:
[chemical formula 4]
[chemical formula 7]
Wherein, R
2, R
3, R
4, R
5, R
7, R
8And R
9Independent separately is C
1-C
6Alkyl, R
6For hydrogen or C
1-C
6Alkyl, the integer that r is 1 to 6, the integer that p is 0 to 10, the integer that y is 0 to 12, s and t are respectively 1 to 3 integer, and the s+t integer that is 2 to 4.
Described electrode group, wherein, the viscosity scope of this high viscosity solvent is 1.5cP to 4.0cP.
Described electrode group, wherein, the viscosity scope of this low-viscosity solvent is 0.3cP to 0.8cP.
Described electrode group, wherein, the volume ratio of this high viscosity solvent and this low-viscosity solvent is 1: 1 to 1: 0.01.
The manufacture method of electrode group provided by the invention comprises:
(A) provide a positive pole, a negative pole and a barrier film; And
(B) use a laminating glue, this positive pole and this negative pole are fitted in respectively to this barrier film, wherein this laminating glue comprises the high viscosity solvent of a viscosity higher than 1cP, the group that it selects free cyclic carbonate compounds, lactone compound and combination thereof to form.
Described electrode group manufacture method, wherein, this laminating glue comprises the low-viscosity solvent of a viscosity lower than 1cP, the group that it selects free chain bis ether compounds, ring-type bis ether compounds, epoxy compounds, chain ester type compound, linear carbonate compounds and combination thereof to form.
Described electrode group manufacture method, wherein, this step (B) is by the roll extrusion pressure sintering, and this positive pole and this negative pole are fitted in to this barrier film.
Described manufacture method, wherein, this cyclic carbonate compounds has the structure shown in following Chemical formula 1, and this lactone compound has the structure shown in following Chemical formula 2:
Wherein, R1 is C
1-C
6Alkyl, the integer that n is 1 to 3, the integer that m is 0 to 8, and the p integer that is 0 to 10.
Described manufacture method, wherein, this chain bis ether compounds has the structure shown in following chemical formula 3, this ring-type bis ether compounds has the structure shown in following chemical formula 4, this epoxy compounds has the structure shown in following chemical formula 5, this chain ester type compound has the structure shown in following chemical formula 6, and this linear carbonate compounds has the structure shown in following chemical formula 7:
[chemical formula 6]
Wherein, R
2, R
3, R
4, R
5, R
7, R
8And R
9Independent separately is C
1-C
6Alkyl, R
6For hydrogen or C
1-C
6Alkyl, the integer that r is 1 to 6, the integer that p is 0 to 10, the integer that y is 0 to 12, s and t are respectively 1 to 3 integer, and the s+t integer that is 2 to 4.
Described manufacture method, wherein, the viscosity scope of this high viscosity solvent is 1.5cP to 4.0cP.
Described manufacture method, wherein, the viscosity scope of this low-viscosity solvent is 0.3cP to 0.8cP.
Described manufacture method, wherein, the volume ratio of this high viscosity solvent and this low-viscosity solvent is 1: 1 to 1: 0.01.
By enforcement of the present invention, can omit existing need with stacker or up-coiler be stacking or the operation of rolled electrode and barrier film, reach to simplify have electrode group manufacturing process now and reduce its manufacturing cost.
The accompanying drawing explanation
Fig. 1 is known stacked electrode group manufacture method.
Fig. 2 is that a preferred embodiment of the present invention is for making the roll extrusion hot-press arrangement schematic diagram of electrode group.
Fig. 3 is the sandwich structure schematic diagram of the positive pole/barrier film/negative pole of a preferred embodiment of the present invention.
Fig. 4 is the embodiment of the present invention 4 and 5 and the made battery discharge test comparative result of the electrode group of comparative example 1.
Primary clustering symbol description in accompanying drawing:
Anodal 1; Barrier film 2; Negative pole 3; Laminating glue 4.
Embodiment
The present invention is when manufacturing the electrode group, by positive pole and negative pole respectively with the laminating glue laminating in barrier film, omit thus existing need with stacker or up-coiler be stacking or the operation of rolled electrode and barrier film, wherein, this laminating glue comprises a high viscosity solvent, and also optionally comprises a low-viscosity solvent.
Accordingly, the invention provides a kind of electrode group, it comprise a positive pole, a negative pole, be inserted in barrier film and between this positive pole and this negative pole be placed between this positive pole and this barrier film and this negative pole and this barrier film between laminating glue.Wherein, this laminating glue can be used for this positive pole and this negative pole are fitted in respectively to this barrier film.More particularly, this positive pole and negative pole can fit in respectively the relative both sides of barrier film.
In the present invention, this high viscosity solvent can be any viscosity higher than 1cP and does not cause the deteriorated cyclic carbonate compounds of battery efficiency, lactone compound or its combination, and this low-viscosity solvent can be chain bis ether compounds, ring-type bis ether compounds, epoxy compounds, chain ester type compound, linear carbonate compounds or its combination of any viscosity lower than 1cP.For example, the optional free C of this high viscosity solvent
3-20Cyclic carbonate compounds, C
4-20The group that lactone compound and combination thereof form, and this low-viscosity solvent can be chain bis ether compounds, ring-type bis ether compounds, epoxy compounds, chain ester type compound, chain acid esters compound or its combination of any viscosity lower than 1cP, for example, the optional free C of this low-viscosity solvent
3-10Chain bis ether compounds, C
3-10Ring-type bis ether compounds, C
4-10Epoxy compounds, C
2-10Chain ester type compound, C
3-10The group that chain acid esters compound and combination thereof form.
Illustrate, high viscosity solvent of the present invention can be lactone compound or its combination of structure shown in the cyclic carbonate compounds with structure shown in following Chemical formula 1, following Chemical formula 2:
Wherein, R
1For C
1-C
6Alkyl, the integer that n is 1 to 3, the integer that m is 0 to 8, and the p integer that is 0 to 10.
Low-viscosity solvent of the present invention can be linear carbonate compounds or its combination of structure shown in the chain ester type compound of structure shown in the epoxy compounds of structure shown in the ring-type bis ether compounds of structure shown in the chain bis ether compounds of structure shown in following chemical formula 3, following chemical formula 4, following chemical formula 5, following chemical formula 6, following chemical formula 7:
[chemical formula 6]
[chemical formula 7]
Wherein, R
2, R
3, R
4, R
5, R
7, R
8And R
9Independent separately is C
1-C
6Alkyl, R
6For hydrogen or C
1-C
6Alkyl, the integer that r is 1 to 6, the integer that p is 0 to 10, the integer that y is 0 to 12, s and t are respectively 1 to 3 integer, and the s+t integer that is 2 to 4.
In addition, the viscosity scope of high viscosity solvent of the present invention is preferably 1.5cP to 4.0cP, is beneficial to plastering agent and is coated on material, and for example in the invention process aspect, the viscosity scope of high viscosity solvent is about 1.7cP to 3.2cP.And the viscosity scope of low-viscosity solvent of the present invention is preferably 0.3cP to 0.8cP, for example in the invention process aspect, the viscosity scope of low-viscosity solvent is about 0.33cP to 0.75cP.More particularly, the high viscosity solvent that the embodiment of the present invention is used comprises ethylene carbonate (EC), propene carbonate (PC), butanediol carbonic ester (BC) and gamma-butyrolacton (GBL), and the low-viscosity solvent comprises diethyl carbonate (DEC), glycol dimethyl ether (DME), oxolane (THF), 2-methyltetrahydrofuran (2MeTHF), 1, 3-dioxolanes (DOL), the 4-methyl isophthalic acid, 3-dioxolanes (4MeDOL), methyl formate (MF), methyl acetate (MA), methyl propionate (MP), dimethyl carbonate (DMC) or methyl ethyl carbonate (EMC), but the present invention is not especially as limit.
In the present invention, the volume ratio of this high viscosity solvent and this low-viscosity solvent can be 1: 1 to 1: 0.01.
Positive pole of the present invention and negative pole there is no specific limited, and it can be any known positive pole and negative pole be applicable in electrochemical appliance (as secondary cell).At this, those electrodes (being positive pole and negative pole) can comprise an electrode base material (as sheet metal) and an electrode coating, wherein electrode coating is coated on electrode base material, and this electrode coating can comprise electrode active material, and optionally comprise appropriate adhesive agent (as Kynoar).In addition, barrier film of the present invention is also without specific limited, and it can be any known barrier film (as polypropylene screen) be applicable in electrochemical appliance.
In addition, the present invention also provides a kind of manufacture method of above-mentioned electrode group, and it comprises use one laminating glue, and positive pole and negative pole are fitted in respectively to barrier film.More particularly, this positive pole and negative pole can fit in respectively barrier film by the roll extrusion pressure sintering.Accordingly, the plastering agent that the present invention has plasticising character can, by roll extrusion hot pressing, fit tightly electrode and barrier film.
In addition, the manufacture method of electrode group of the present invention also can comprise a drying steps, to reduce the water content in positive pole and negative pole.For example, can be by the heating in vacuum mode, to carry out this drying steps.
In said method, the manufacture stacked electrode group of take is example, after positive pole, negative pole and barrier film first can being cut into to required suitable size, with laminating glue, coat on anodal and negative pole, the mode by roll extrusion hot pressing makes positive pole, barrier film and negative pole one single the electrode group of formation of entirely fitting again.The formed unitary electrode group of method can be in follow-up while being assembled into battery accordingly, the electric weight of the battery of manufacturing according to wish, can between each unitary electrode group, be coated with laminating glue the barrier film of planting, follow stacking plurality of electrodes group again, and reserved conduction handle is welded to each other and can completes by the electrode slice on the plurality of electrodes group, need not pass through again the stacking plurality of electrodes pole piece of stacker and barrier film.
The manufacture method of above-mentioned stacked electrode group and battery thereof is only for specifically describing advantage of the present invention, the method that the present invention makes electrode group and battery is not limited to above-mentioned exemplary method, and be not limited to make stacked electrode group, any known electrode group structure (as Wound type electrode group etc.) all can be used coating technique of the present invention, that is, except the present invention replaces known stacker Stack Technology with coating technique, the correlation technique of other known making electrode groups and battery all can be applicable in the present invention.
Accordingly, owing to reaching the manufacture method with roll extrusion hot pressing laminating electrode group by laminating glue, the electrode group of manufacturing is made on engineering method compared to the traditional electrode group, the characteristics that the operation of being easier to is arranged, as this electrode group can not cause following process to be difficult for because the traveling electrode group causes pole piece and barrier film dislocation to slip off accidentally because laminating glue fits tightly, even cause the battery capacity of manufacturing to descend.In addition, when known use stacker is made the electrode group, between electrode and barrier film, not fit tightly, still have space therebetween, when pursuing slimming, real is its shortcoming.Battery manufacture skill need be carried out stacking and electrolyte perfusion and contained aqueous vapor with the battery of avoiding made in special dry factory building or hothouse in addition, and then reacts and cause the battery product Quality Down with constituent in battery.Yet pole piece of the present invention fits tightly by laminating glue and barrier film roll extrusion hot pressing after drying, this step only need be carried out in ordinary plant.When follow-up perfusion electrolyte, in drying shed, carry out again, can exempt complete section processing procedure all carries out in hothouse, also can reach the low-moisture demand of battery, better, because the electrode group is easy and simple to handle, can under the inert gas environments such as glove box, carry out electrolyte perfusion and cell package, can make the battery quality of manufacture better, and reduce the high maintenance cost of hothouse.
From the above, due to the electrolyte compatibility that the selected laminating glue of the present invention can be used with general battery, therefore, the present invention can avoid filling with because laminating glue causes electrolyte to permeate the problem that the battery that causes manufacturing between the electrode group forms defective that enters.Accordingly, the present invention also provides a kind of electrochemical appliance (as secondary cell), and it comprises above-mentioned electrode group and an electrolyte, and wherein this electrolyte is the ion channel be used to form between positive pole and negative pole.
In the present invention, " viscosity " word typically refers to k value measured under 25 ℃.Yet, the k value of the viscosity of EC of the present invention for recording under 40 ℃, the viscosity of the solvent in other the present invention is k value measured under 25 ℃.
In the present invention, " cyclic carbonate compounds " word is the saturated or unsaturation ring-type hydrocarbon that comprises carbonate group (OC (O) O-) in ring structure, as: EC, PC, BC etc.; " lactone compound " word is the saturated or unsaturation ring-type hydrocarbon (can be described as again the cyclic ester compounds) that comprises ester group (C (O) O-) in ring structure, as: GBL; " chain bis ether compounds " word refers in chain structure and comprises the saturated of two ethers or unsaturation straight or branched hydrocarbon, as: DEC; " ring-type bis ether compounds " word is to comprise the saturated of two ethers or unsaturation ring-type hydrocarbon in ring structure, as: DOL, 4MeDOL; " epoxy compounds " word is to comprise the saturated of an oxygen atom or unsaturation ring-type hydrocarbon (can be described as again the cyclic ether compounds) in ring structure, as: THF, 2MeTHF; " chain ester type compound " word refers in chain structure and comprises the saturated of ester group or unsaturation straight or branched hydrocarbon, as: MF, MA, MP etc." linear carbonate compounds " word refers in chain structure and comprises the saturated of carbonate group or unsaturation straight or branched hydrocarbon, as: DEC, DMC, EMC etc.; " alkyl " word refers to finger saturated straight chain or branched carbon hydrogen group, as :-CH
3Or-CH (CH
3)
2.
Unless particularly pointed out, otherwise cyclic carbonate compounds described herein, lactone compound, chain bis ether compounds, ring-type bis ether compounds, epoxy compounds, chain ester type compound, linear carbonate compounds may be the compound that is substituted and is unsubstituted, wherein substituting group may be replaced on the either carbon atom on ring structure or chain structure, for example, the substituting group such as alkyl, alkenyl or alkynyl can be replaced on the either carbon atom on ring structure.
Below by specific concrete preparation example explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by content disclosed in the present specification.The present invention also can be different by other concrete preparation example implemented or applied, the every details in this specification also can, for different viewpoints and application, be carried out various modifications and change under not departing from spirit of the present invention.
The electrode fabrication mode of the present invention in embodiment 1-2 is the known method in art technology, only for specifically describing related embodiment of the present invention, states.
Embodiment 1
MnO by 80-95%
2, acetylene carbon black 3-15% and adhesive agent polyvinylidene fluoride (PVDF) 3-10% be dissolved in METHYLPYRROLIDONE (NMP) and form the positive electrode active materials slurry, then this slurry is coated to the aluminium foil of long 50m, wide 15cm, thick 20 μ m, and dry 4 hours under 120 ℃, finally carry out itemize and roll and make required anode plate.
Jie's phase carbosphere (MCMB) by 90% is dissolved in NMP and forms the negative active core-shell material slurry with 10% adhesive agent PVDF, then this slurry is coated to the Copper Foil of long 50m, wide 15cm, thick 20 μ m, and dry 4 hours under 120 ℃, finally carry out itemize and roll and make required negative plates.
EC and DEC are mixed with to required solvent with volume ratio at 1: 1, then again by the LiPF of 152g
6Be dissolved in the above-mentioned mixed solvent of 1L and be prepared into 1M LiPF
6, as the electrolyte in the perfusion battery.
EC is mixed and makes laminating glue a with 1: 1 volume ratio with PC.Then, as shown in Figure 2, by above-described embodiment 1 and 2 prepared anode pole pieces 1 with cathode pole piece 3 respectively with the present embodiment made laminating glue 4 wetting, then barrier film 2 is inserted in to the positive pole 1 wetting through laminating glue and 3, negative pole, in the mode of roll extrusion hot pressing, electrode plates and barrier film 2 is fitted tightly to the sandwich structure of formation as positive pole/barrier film of Fig. 3/negative pole.Wherein, barrier film is selected the polypropylene that engineering properties is high, thickness is 20 μ m (PP) film.
Embodiment 5
The preparation method of the embodiment of the present invention 5 and embodiment 4 are described roughly the same, only difference be in, the laminating glue b that the present embodiment is used is the EC that mixes 0.8: 1: 0.2 (volume ratio): PC: DEC is obtained.
Embodiment 6
The preparation method of the embodiment of the present invention 6 and embodiment 4 are described roughly the same, only difference be in, use respectively the described laminating glue of following table 1-3 c-n, to replace laminating glue a.In table 1-3, except the EC viscosity is 1.9cP at 40 ℃; Remaining solvent under 25 ℃ respectively the PC viscosity be 2.5cP; The BC viscosity is 3.2cP; The GBL viscosity is 1.7cP; The DOL viscosity is 0.59cP; The 4MeDOL viscosity is 0.6cP; The THF viscosity is 0.46cP; The 2MeTHF viscosity is 0.47cP; The MA viscosity is 0.3cP; The MP viscosity is 0.43cP; The MF viscosity is 0.33cP; The DEC viscosity is 0.75cP; The EMC viscosity is 0.65cP; And the DME viscosity is 0.46cP.
Comparative example 1
Electrode plates and barrier film that this comparative example is used are same as the previously described embodiments, and only difference is in engineering method sequentially stacked electrodes pole piece and the barrier film that uses stacker in, this comparative example j, and it does not use laminating glue.
Test example
The made electrode component of above-described embodiment 4, embodiment 5 and comparative example 1 is not in order to be made into stacked batteries, wherein, the electrolyte ingredient used as described in Example 3, the discharge rate of all stacking unitary electrode group of electrode group and battery is all 0.05C, and carries out the battery discharge test under 25 ℃ of normal temperature.As shown in Figure 4, wherein the transverse axis of Fig. 4 is the Unit Weight discharge capacity to its test result, and unit is mAh/g, the about 14mAh of battery capacity; The longitudinal axis is cell voltage, and unit is V.In battery, its electric capacity is relevant to the stacking number of electrode group of this battery, therefore, from Fig. 4, can find, under the identical stacking number of electrode group and identical conditions such as electrolyte, the operational voltage value of the battery of the battery of comparative example 1 and embodiment 4 and 5 is close, shows that the battery with laminating glue of the present invention and manufacture battery engineering method made thereof does not undermine the performance of this battery.
Above-described embodiment is only to give an example for convenience of description, and the interest field that the present invention advocates should be as the criterion with the claim scope of application certainly, but not only limits to above-described embodiment.
Table 1
| EC | PC | BC | DOL | THF | DME | MA | |
| Laminating glue c | 0.1 | 0.2 | 0.2 | 0.5 | 0.5 | 0 | 0 |
| Laminating glue d | 0.3 | 0.4 | 0.2 | 0.01 | 0.03 | 0.06 | 0 |
| Laminating glue e | 0.3 | 0.4 | 0.2 | 0.01 | 0.03 | 0.04 | 0.02 |
Table 2
| EC | PC | GBL | MF | DEC | DME | MP | |
| Laminating glue f | 0.3 | 0.4 | 0.3 | 0 | 0 | 0 | 0 |
| Laminating glue g | 0.3 | 0.4 | 0.2 | 0.04 | 0.06 | 0 | 0 |
| Laminating glue h | 0.3 | 0.4 | 0.2 | 0.03 | 0.04 | 0.03 | 0 |
| Laminating glue i | 0.3 | 0.4 | 0.2 | 0.03 | 0.03 | 0.03 | 0.01 |
Table 3
| EC | PC | GBL | BC | 2MeTHF | 4MeDOL | MA | EMC | |
| Laminating glue j | 0.2 | 0.3 | 0.19 | 0.3 | 0.01 | 0 | 0 | 0 |
| Laminating glue k | 0.2 | 0.3 | 0.2 | 0.2 | 0.1 | 0 | 0 | 0 |
| Laminating glue l | 0.2 | 0.3 | 0.2 | 0.2 | 0.04 | 0.06 | 0 | 0 |
| Laminating glue m | 0.2 | 0.2 | 0.2 | 0.2 | 0.05 | 0.03 | 0.02 | 0 |
| Laminating glue n | 0.2 | 0.2 | 0.2 | 0.2 | 0.04 | 0.03 | 0.02 | 0.01 |
Claims (15)
1. an electrode group comprises:
One positive pole;
One negative pole;
One barrier film, be inserted between this positive pole and this negative pole; And
One laminating glue, be placed between this positive pole and this barrier film and reach between this negative pole and this barrier film, so that this positive pole and this negative pole are fitted in respectively to this barrier film, wherein this laminating glue comprises the high viscosity solvent of a viscosity higher than 1cP, the group that it selects free cyclic carbonate compounds, lactone compound and combination thereof to form.
2. electrode group as claimed in claim 1, wherein, this laminating glue comprises the low-viscosity solvent of a viscosity lower than 1cP, the group that it selects free chain bis ether compounds, ring-type bis ether compounds, epoxy compounds, chain ester type compound, linear carbonate compounds and combination thereof to form.
3. electrode group as claimed in claim 1, wherein, this cyclic carbonate compounds has the structure shown in following Chemical formula 1, and this lactone compound has the structure shown in following Chemical formula 2:
Wherein, R
1For C
1-C
6Alkyl, the integer that n is 1 to 3, the integer that m is 0 to 8, and the p integer that is 0 to 10.
4. electrode group as claimed in claim 2, wherein, this chain bis ether compounds has the structure shown in following chemical formula 3, this ring-type bis ether compounds has the structure shown in following chemical formula 4, this epoxy compounds has the structure shown in following chemical formula 5, this chain ester type compound has the structure shown in following chemical formula 6, and this linear carbonate compounds has the structure shown in following chemical formula 7:
[chemical formula 7]
Wherein, R
2, R
3, R
4, R
5, R
7, R
8And R
9Independent separately is C
1-C
6Alkyl, R
6For hydrogen or C
1-C
6Alkyl, the integer that r is 1 to 6, the integer that p is 0 to 10, the integer that y is 0 to 12, s and t are respectively 1 to 3 integer, and the s+t integer that is 2 to 4.
5. electrode group as claimed in claim 1, wherein, the viscosity scope of this high viscosity solvent is 1.5cP to 4.0cP.
6. electrode group as claimed in claim 2, wherein, the viscosity scope of this low-viscosity solvent is 0.3cP to 0.8cP.
7. electrode group as claimed in claim 2, wherein, the volume ratio of this high viscosity solvent and this low-viscosity solvent is 1: 1 to 1: 0.01.
8. the manufacture method of an electrode group comprises:
(A) provide a positive pole, a negative pole and a barrier film; And
(B) use a laminating glue, this positive pole and this negative pole are fitted in respectively to this barrier film, wherein this laminating glue comprises the high viscosity solvent of a viscosity higher than 1cP, the group that it selects free cyclic carbonate compounds, lactone compound and combination thereof to form.
9. electrode group manufacture method as claimed in claim 8, wherein, this laminating glue comprises the low-viscosity solvent of a viscosity lower than 1cP, the group that it selects free chain bis ether compounds, ring-type bis ether compounds, epoxy compounds, chain ester type compound, linear carbonate compounds and combination thereof to form.
10. electrode group manufacture method as claimed in claim 8, wherein, this step (B) is by the roll extrusion pressure sintering, and this positive pole and this negative pole are fitted in to this barrier film.
11. manufacture method as claimed in claim 8, wherein, this cyclic carbonate compounds has the structure shown in following Chemical formula 1, and this lactone compound has the structure shown in following Chemical formula 2:
Wherein, R1 is C
1-C
6Alkyl, the integer that n is 1 to 3, the integer that m is 0 to 8, and the p integer that is 0 to 10.
12. manufacture method as claimed in claim 9, wherein, this chain bis ether compounds has the structure shown in following chemical formula 3, this ring-type bis ether compounds has the structure shown in following chemical formula 4, this epoxy compounds has the structure shown in following chemical formula 5, this chain ester type compound has the structure shown in following chemical formula 6, and this linear carbonate compounds has the structure shown in following chemical formula 7:
[chemical formula 4]
[chemical formula 6]
Wherein, R
2, R
3, R
4, R
5, R
7, R
8And R
9Independent separately is C
1-C
6Alkyl, R
6For hydrogen or C
1-C
6Alkyl, the integer that r is 1 to 6, the integer that p is 0 to 10, the integer that y is 0 to 12, s and t are respectively 1 to 3 integer, and the s+t integer that is 2 to 4.
13. manufacture method as claimed in claim 8, wherein, the viscosity scope of this high viscosity solvent is 1.5cP to 4.0cP.
14. manufacture method as claimed in claim 9, wherein, the viscosity scope of this low-viscosity solvent is 0.3cP to 0.8cP.
15. manufacture method as claimed in claim 9, wherein, the volume ratio of this high viscosity solvent and this low-viscosity solvent is 1: 1 to 1: 0.01.
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| TW101118687A TWI496341B (en) | 2012-05-25 | 2012-05-25 | Electrode assembly and its fabrication method |
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|---|---|---|---|---|
| CN105811018A (en) * | 2016-05-07 | 2016-07-27 | 合肥国轩高科动力能源有限公司 | Method for fixing pole plate on diaphragm |
| CN110247124A (en) * | 2019-06-24 | 2019-09-17 | 惠州亿纬锂能股份有限公司 | A kind of lithium ion battery high speed laminating method, lamination device and lithium ion battery |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1264927A (en) * | 1999-02-24 | 2000-08-30 | 索尼株式会社 | Non-aqueous electrolyte battery |
| CN1383228A (en) * | 2001-04-27 | 2002-12-04 | 财团法人工业技术研究院 | Lithium battery with self-viscosity high-molecular electrolyte and its preparing process |
| JP2006339011A (en) * | 2005-06-01 | 2006-12-14 | Hitachi Ltd | Lithium ion secondary battery |
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|---|---|---|---|---|
| TW543225B (en) * | 2002-04-11 | 2003-07-21 | Ind Tech Res Inst | Manufacturing method of rechargeable polymer cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1264927A (en) * | 1999-02-24 | 2000-08-30 | 索尼株式会社 | Non-aqueous electrolyte battery |
| CN1383228A (en) * | 2001-04-27 | 2002-12-04 | 财团法人工业技术研究院 | Lithium battery with self-viscosity high-molecular electrolyte and its preparing process |
| JP2006339011A (en) * | 2005-06-01 | 2006-12-14 | Hitachi Ltd | Lithium ion secondary battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811018A (en) * | 2016-05-07 | 2016-07-27 | 合肥国轩高科动力能源有限公司 | Method for fixing pole plate on diaphragm |
| CN110247124A (en) * | 2019-06-24 | 2019-09-17 | 惠州亿纬锂能股份有限公司 | A kind of lithium ion battery high speed laminating method, lamination device and lithium ion battery |
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| Publication number | Publication date |
|---|---|
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| TW201349641A (en) | 2013-12-01 |
| CN103427118B (en) | 2016-10-05 |
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