CN100418251C - Preparation method of electrode plates of lithium cell - Google Patents
Preparation method of electrode plates of lithium cell Download PDFInfo
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- CN100418251C CN100418251C CNB2005100021441A CN200510002144A CN100418251C CN 100418251 C CN100418251 C CN 100418251C CN B2005100021441 A CNB2005100021441 A CN B2005100021441A CN 200510002144 A CN200510002144 A CN 200510002144A CN 100418251 C CN100418251 C CN 100418251C
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- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 10
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 40
- 238000005096 rolling process Methods 0.000 claims abstract description 29
- 239000002002 slurry Substances 0.000 claims abstract description 27
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 26
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000005520 cutting process Methods 0.000 claims description 24
- 239000011149 active material Substances 0.000 claims description 23
- 239000000853 adhesive Substances 0.000 claims description 16
- 230000001070 adhesive effect Effects 0.000 claims description 16
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000000280 densification Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 6
- 238000012797 qualification Methods 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000007774 positive electrode material Substances 0.000 description 13
- 239000007773 negative electrode material Substances 0.000 description 11
- 230000004888 barrier function Effects 0.000 description 10
- -1 polytetrafluoroethylene Polymers 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000008151 electrolyte solution Substances 0.000 description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 description 6
- 239000002033 PVDF binder Substances 0.000 description 5
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000006258 conductive agent Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 239000005030 aluminium foil Substances 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical compound O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910018871 CoO 2 Inorganic materials 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 229910012820 LiCoO Inorganic materials 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 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
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 229920002367 Polyisobutene Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 235000019241 carbon black Nutrition 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229960002317 succinimide Drugs 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical group 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 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
Abstract
The present invention relates to a preparation method for electrode plates of a lithium battery, which comprises a slurry process, a rolling process, a parting cut process and a cut-off process, wherein the slurry process is followed by the parting cut process and then the rolling process. By adopting the method, the number of burrs existing on the electrode plates of the lithium ion battery can be greatly reduced, and the height of the burrs is also decreased. Therefore, the present invention can greatly reduce the short circuit rate of the battery, and improves the qualification rate of the battery.
Description
Technical field
The invention relates to a kind of preparation method of electrode for secondary battery pole piece, more specifically say so about a kind of preparation method of electrode plates of lithium cell.
Background technology
Flourish along with information technology, and improving constantly to the environmental protection attention degree, lithium secondary battery has obtained huge development with its high-energy-density, high voltage, advantage such as volume is little, in light weight, fail safe is good over past ten years, become one of main energy sources of communication class electronic product.
Lithium ion battery comprises electrode label and nonaqueous electrolytic solution, described electrode label and nonaqueous electrolytic solution are sealed in the battery container, described electrode label comprises anode pole piece, cathode pole piece and barrier film, and anode pole piece, cathode pole piece and barrier film are reeled by the volume pin and formed.
In the prior art, the preparation method of anode pole piece comprises the slurry operation successively, and rolling process divides cutting process and cuts off operation, and wherein, the slurry operation refers to go up a kind of slurries that contain positive active material and adhesive of coating, drying at wide cut conducting base (collector body).Rolling process refers to carry out rolling with being coated with the conducting base that is covered with active material, makes to be coated with to be covered with the coating that active material forms densification.Divide cutting process to refer in cutting machine, the pole piece after the rolling be cut into preset width.Cut off operation and refer to the pole piece after cutting is cut off, make pole piece length meet the operation of different battery needs.The preparation method of cathode pole piece is except positive active material wherein is changed to the negative electrode active material, and is identical with the preparation method of anode pole piece.
Because among the preparation method of above-mentioned pole piece, slurry, rolling, to cut and cut off and can form a kind of tinuous production, automaticity is higher, therefore, and preparation work efficient height, the manual operation cost is lower.So for a long time, the preparation method of electrodes of lithium-ion batteries has formed this fixing pattern, all producers all adopt this method to prepare electrodes of lithium-ion batteries basically.
Yet, there is an insurmountable fatal shortcoming in said method, there is a large amount of burrs on the electrode that promptly adopts this method to prepare, these burrs very easily puncture barrier film in the process of follow-up coiling and preparation battery, thereby cause battery short circuit, the short circuit ratio of battery is higher, greatly reduces the qualification rate of battery, thereby increased production cost, reduced production efficiency.
Summary of the invention
The objective of the invention is to overcome on the electrodes of lithium-ion batteries of prior art for preparing and have a large amount of burrs, the higher shortcoming of short circuit ratio that causes battery, provide on a kind of battery pole piece burr less, the preparation method of the lithium ion cell electrode pole piece that the short circuit ratio of battery is lower.
The preparation method of lithium ion cell electrode pole piece provided by the invention comprises the slurry operation, and rolling process divides cutting process and cuts off operation, wherein, after the slurry operation, cuts operation earlier, carries out rolling process again.
Adopt method of the present invention can significantly reduce the burr that exists on the electrodes of lithium-ion batteries, reduce the height of burr, thereby can reduce the battery short circuit rate greatly, improve the qualification rate of battery.
Description of drawings
Fig. 1 is the stereoscan photograph that adopts the anode pole piece of method preparation provided by the invention;
Fig. 2 is the stereoscan photograph that adopts the anode pole piece of prior art for preparing.
Embodiment
The preparation method of lithium ion cell electrode pole piece provided by the invention comprises the slurry operation, and rolling process divides cutting process and cuts off operation, wherein, after the slurry operation, cuts operation earlier, carries out rolling process again.
Wherein, electrode plates can be anode pole piece or cathode pole piece.
Described slurry operation can adopt existing slurry operation, promptly goes up at wide cut conducting base (or being called collector body) and applies a kind of slurries that contain active material and adhesive, drying.On the wide cut conducting base, apply the method that the slurries that contain active material and adhesive can adopt artificial coating, perhaps adopt the method that on tensile pulp machine, applies, be preferably the method that on tensile pulp machine, applies.Dry condition is conventionally known to one of skill in the art, and dry temperature is generally 50-160 ℃, preferred 80-150 ℃.
When described electrode plates was anode pole piece, the described slurries that contain active material and adhesive referred to contain the slurries of positive active material and adhesive, and described conducting base is the conducting base that is suitable as lithium ion cell positive.The described conducting base that is suitable as lithium ion cell positive is conventionally known to one of skill in the art, for example can be aluminium foil.Described positive active material can be selected from the positive active material of lithium secondary battery routine, as Li
xNi
1-yCoO
2(wherein, 0.9≤x≤1.1,0≤y≤1.0), Li
mMn
2-nB
nO
2(wherein, B is a transition metal, 0.9≤m≤1.1,0≤n≤1.0), Li
1+aM
bMn
2-bO
4In (wherein ,-0.1≤a≤0.2,0≤b≤1.0, M is a kind of in lithium, boron, magnesium, aluminium, titanium, chromium, iron, cobalt, nickel, copper, zinc, gallium, yttrium, fluorine, iodine, the element sulphur) one or more.The kind of described adhesive and content are conventionally known to one of skill in the art, for example one or more in fluorine resin and polyolefin compound such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), the butadiene-styrene rubber (SBR).In general, the content of positive active material is 40-90 weight % in the described slurries that contain positive active material and adhesive, is preferably 50-85 weight %; The content of described adhesive is the 0.01-8 weight % of positive active material, is preferably 1-5 weight %.
When described electrode plates was cathode pole piece, the described slurries that contain active material and adhesive referred to contain the slurries of negative pole utmost point active material and adhesive, and described conducting base is the conducting base that is suitable as lithium ion battery negative.The described conducting base that is suitable as lithium ion battery negative is conventionally known to one of skill in the art, for example can be selected from
The copper poolDescribed negative electrode active material can be selected from the negative electrode active material of lithium secondary battery routine, as in native graphite, Delanium, petroleum coke, organic cracking carbon, carbonaceous mesophase spherules, carbon fiber, ashbury metal, the silicon alloy one or more.Described adhesive can be selected from the adhesive of lithium secondary battery routine, as in fluorine resin and polyolefin compound such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), the butadiene-styrene rubber (SBR) one or more.In general, negative pole utmost point content of active substance is 40-90 weight % in the described slurries that contain negative electrode active material and adhesive, is preferably 50-85 weight %; The content of described adhesive is the 0.01-8 weight % of negative electrode active material, is preferably 1-5 weight %.Can also comprise the negative pole auxiliary agent in the described slurries that contain negative electrode active material and adhesive, the kind of described negative pole auxiliary agent and content are conventionally known to one of skill in the art, for example, described negative pole auxiliary agent can be selected from conductive agent, as in acetylene black, conductive carbon black, the electrically conductive graphite one or more, its content is the 0-15 weight % of negative electrode active material, is preferably 0-10 weight %.
Described minute cutting process is meant and cuts being coated with the wide cut conducting base that is covered with active material that the width of cutting makes the width that is coated with the conducting base that is covered with active material that obtains be suitable as electrodes of lithium-ion batteries after rolling.In general, the width of cutting can in very large range change according to the size of battery, and making the width that is coated with the conducting base that is covered with active material that obtains as the width that cuts after rolling is the 10-200 millimeter, and along with the development of technology, can be wideer or narrower.Described method of cutting can adopt existing cutting method arbitrarily, as method of manually cutting or the method for cutting with cutting machine.
Described rolling process refers to be coated with the coating that the active material that is covered with forms densification with making.The degree of active material densification makes the density of active material meet the requirement of battery, and the degree of active material densification is conventionally known to one of skill in the art.According to the difference of battery, the thickness that is coated with the conducting base that is covered with active material that obtains after the rolling can in very large range change, and for existing small-scale lithium ion cell, this thickness is generally the 0.08-0.15 millimeter.Described rolling method can adopt existing rolling method arbitrarily, as carry out the method for rolling with rolling mill.
Described cut-out operation refers to that the conducting base that being coated with after the rolling is covered with active material cuts off, and makes pole piece length be suitable as electrodes of lithium-ion batteries.The method of described cut-out can adopt the existing method of cutting off arbitrarily, as the method for artificial cut-out or the method for cutting with cutting machine.
Pole piece according to method preparation provided by the invention can comprise anode pole piece and cathode pole piece as the pole piece of lithium ion battery.Anode pole piece, barrier film, cathode pole piece are reeled, place in the battery case, add luxuriant and rich with fragrance water electrolysis liquid, sealing just can obtain lithium ion battery.The method of the kind of described method for winding, barrier film, nonaqueous electrolytic solution and consumption, sealing is conventionally known to one of skill in the art.
The following examples will the invention will be further described.
This example illustrates method provided by the invention and contains the lithium ion battery of the pole piece of method preparation provided by the invention.
(1) preparation of anode pole piece
A:100 part weight positive active material LiCoO
2, 4 parts of weight bonding agent PVDF (polyvinylidene fluoride), 4 parts of weight conductive agent acetylene blacks join among 40 parts of weight NMP (N-methyl pyrrolidone), in de-airing mixer, stir then and form dispersion anode sizing agent stable, homogeneous.This slurry is coated on the wide cut aluminium foil (wide is 500 millimeters, and thickness is 0.2 millimeter) equably with tensile pulp machine, and then, 120 ℃ of oven dry obtain being coated with the wide cut pole piece that is covered with positive active material.
B: to cut into width be 44 millimeters narrow pole piece to the wide cut pole piece that is covered with positive active material that is coated with that will obtain.
C: rolling on roller mill obtains thickness and is 0.1 millimeter narrow pole piece.
D: the narrow pole piece that is covered with positive active material that is coated with after the rolling that (C) obtained cuts off on cutting machine, obtain 433 * 44 * 0.1 millimeter anode pole piece.Positive active material LiCoO on the anode pole piece
2Content be 7.5 the gram.The electronic scanning electromicroscopic photograph of the middle part of the long arris of this pole piece (amplifying 20 times) as shown in Figure 1.
(2) preparation of cathode pole piece
A:100 part weight negative electrode active material native graphite, 4 parts of weight bonding agent PTFE (polytetrafluoroethylene), 4 parts of weight conductive agent carbon blacks join among 40 parts of weight DMSO (dimethyl sulfoxide (DMSO)), add 0.3 part of weight fraction powder (polyisobutene succinimide: poly(ethylene oxide) ether=1: 1), in de-airing mixer, stir then and form dispersion cathode size stable, homogeneous again.This slurry is coated on the wide cut Copper Foil (wide is 500 millimeters, and thickness is 0.2 millimeter) equably with tensile pulp machine, and then, 120 ℃ of oven dry obtain being coated with the wide cut pole piece that is covered with negative electrode active material.
B: to cut into width be 45 millimeters narrow pole piece to the wide cut pole piece that is covered with negative electrode active material that is coated with that will obtain.
C: rolling on roller mill obtains thickness and is 0.1 millimeter narrow pole piece.
D: the narrow pole piece that is covered with negative pole utmost point active material that is coated with after the rolling that (C) obtained cuts off on cutting machine, obtains 400 * 45 * 0.1 millimeter negative pole utmost point pole piece.The content of negative electrode active material native graphite is 3.6 grams on the cathode pole piece.
(3) preparation of electrode label
Anode pole piece, cathode pole piece and the barrier film polypropylene screen (thickness is 0.01mm, produces) of (1) and (2) preparation are wound into the electrode label.
(4) assembling of battery
With LiPF
6Be configured to LiPF with EC and DMC
6Concentration is that (volume ratio of EC/DMC is 1: 1 for the solution of 1 mol.EC is an ethylene carbonate, and DMC is a dimethyl carbonate), obtain nonaqueous electrolytic solution, the consumption of nonaqueous electrolytic solution is 2.2 grams/only.The electrode label that (3) are obtained places in 5 * 34 * 50 millimeters the rectangular cell shell, injects above-mentioned nonaqueous electrolytic solution, and lithium ion battery is made in sealing.Prepare 20000 same batteries altogether.
Comparative Examples 1
The preparation method and the lithium ion battery that comprises this pole piece of the existing electrode plates of this Comparative Examples explanation.
Method according to example 1 prepares pole piece and lithium ion battery, different just, in the preparation process of anode pole piece and cathode pole piece, C and B reversed order.The electronic scanning electromicroscopic photograph of the middle part of the long arris of anode pole piece (amplifying 20 times) as shown in Figure 2.Prepare 20000 same batteries altogether.
Example 2
Following example illustrates the short circuit ratio of battery provided by the invention.
Short circuit ratio to the battery of example 1-4 preparation is measured.Assay method is: adopt universal instrument to survey the internal resistance of cell, internal resistance is a short circuit battery less than the battery of 20 megaohms, sort out the battery that is short-circuited in 20000 batteries, then, the battery that is short-circuited is taken apart, analyze the reason that it is short-circuited, obtain because the pole piece burr pierces through the number that barrier film causes the battery of internal short-circuit of battery.The result is as follows: the short circuit ratio of 20000 batteries of example 1 preparation is 0.01%.Wherein, short circuit ratio refer to since the pole piece burr pierce through the short circuit ratio that barrier film causes internal short-circuit of battery, promptly short circuit ratio=since the pole piece burr pierce through battery number/20000. that barrier film causes internal short-circuit of battery
Comparative Examples 2
The explanation of this Comparative Examples comprises the short circuit ratio of the lithium ion battery of the electrode plates that adopts existing method preparation.
The method of pressing example 2 is measured the short circuit ratio of 20000 batteries of Comparative Examples 1 preparation, and its short circuit ratio is 0.05%.
The result of Fig. 1 and 2 shows, adopts on the electrode plates of method preparation provided by the invention, and the size and the quantity of burr are all obviously reduced, and the surface of electrode plates is more level and smooth.The result of example 2 and Comparative Examples 2 shows, compares with the lithium ion battery that comprises the electrode plates that adopts existing method preparation, comprises that the short circuit ratio of the battery of the electrode plates that adopts method preparation provided by the invention has reduced by 80%.Adopt method of the present invention, do not increasing operating procedure, not obvious change operating condition, just changed under the situation of cutting in the prior art with the order of rolling, just make because the pole piece burr pierces through the battery short circuit rate that barrier film causes is reduced greatly, this to those skilled in the art, outside being all beyond one's expectations.
Claims (2)
1. the preparation method of an electrode plates of lithium cell, this method comprises the slurry operation, rolling process divides cutting process and cuts off operation, it is characterized in that, after the slurry operation, cuts operation earlier, carries out rolling process again, cuts off operation then.
2. method according to claim 1 is characterized in that, described slurry operation refers to apply a kind of slurries that contain active material and adhesive, drying on the wide cut conducting base; Described minute cutting process is meant and cuts being coated with the wide cut conducting base that is covered with active material that the width of cutting makes the width that is coated with the conducting base that is covered with active material be suitable as electrodes of lithium-ion batteries; Described rolling process refers to carry out rolling with being coated with the conducting base that is covered with active material, makes to be coated with the coating that the active material that is covered with forms densification; Described cut-out operation refers to that the conducting base that being coated with after cutting is covered with active material cuts off, and makes pole piece length be suitable as electrodes of lithium-ion batteries.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100021441A CN100418251C (en) | 2005-01-14 | 2005-01-14 | Preparation method of electrode plates of lithium cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100021441A CN100418251C (en) | 2005-01-14 | 2005-01-14 | Preparation method of electrode plates of lithium cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1805178A CN1805178A (en) | 2006-07-19 |
| CN100418251C true CN100418251C (en) | 2008-09-10 |
Family
ID=36867087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100021441A Expired - Fee Related CN100418251C (en) | 2005-01-14 | 2005-01-14 | Preparation method of electrode plates of lithium cell |
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| CN105470448B (en) * | 2015-12-25 | 2017-09-05 | 苏州达力客自动化科技有限公司 | A kind of pole piece feeding rolling device |
| CN106654178B (en) * | 2016-12-13 | 2019-03-15 | 中国电子科技集团公司第十八研究所 | Auxiliary tool for punching laminated lithium ion battery pole piece and punching method |
| CN108110220B (en) * | 2017-11-27 | 2020-08-04 | 国联汽车动力电池研究院有限责任公司 | Preparation method of high-load high-compaction-density lithium ion battery pole piece |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11176424A (en) * | 1997-12-10 | 1999-07-02 | Mitsubishi Cable Ind Ltd | Manufacture of electrode plate tape for battery |
| CN1444303A (en) * | 2002-03-08 | 2003-09-24 | 居永明 | Repeatedly chargeable-dischargeable lithium ion power cell and its production method |
| CN1485940A (en) * | 2003-08-26 | 2004-03-31 | 北大先行科技产业有限公司 | Lithium ion cell, electrode of lithium ion cell and its preparation method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11176424A (en) * | 1997-12-10 | 1999-07-02 | Mitsubishi Cable Ind Ltd | Manufacture of electrode plate tape for battery |
| CN1444303A (en) * | 2002-03-08 | 2003-09-24 | 居永明 | Repeatedly chargeable-dischargeable lithium ion power cell and its production method |
| CN1485940A (en) * | 2003-08-26 | 2004-03-31 | 北大先行科技产业有限公司 | Lithium ion cell, electrode of lithium ion cell and its preparation method |
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