CN105470447A - Preparation method of electrode plate for lithium-ion battery - Google Patents
Preparation method of electrode plate for lithium-ion battery Download PDFInfo
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- CN105470447A CN105470447A CN201510719072.6A CN201510719072A CN105470447A CN 105470447 A CN105470447 A CN 105470447A CN 201510719072 A CN201510719072 A CN 201510719072A CN 105470447 A CN105470447 A CN 105470447A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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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
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The invention discloses a preparation method of an electrode plate for a lithium-ion battery. The method comprises the steps as follows: a foamed gummed paper is attached to a tab welding region of foil; gum in the foamed gummed paper contains a foaming agent; the foil is coated, so that an active material completely covers the foil and the foamed gummed paper; the coated foil is fed into an oven for segmental baking; the oven comprises a plurality of segments of ovens; the last segment of oven is a high-temperature oven; the temperature of the high-temperature oven is the highest and higher than the foaming temperature of the foaming agent in the foamed gummed paper; the foamed gummed paper of which the viscosity is reduced to crimp after being baked at a high temperature is cleared away by a hairbrush after the foil is taken out of the oven, so that blank foil is exposed in the tab region; and baking, rolling, slitting and tab welding are carried out on the electrode plate, so that fabrication of the electrode plate is finished. The foamed gummed paper which can be foamed at the high temperature to cause a viscosity failure is attached to the tab welding region of the electrode plate; and the affinity of the foaming agent added to the gum layer on an adhesive is much greater than that of the foil on the adhesive, so that the foil is prevented from being adhered to the adhesive.
Description
Technical field
The invention belongs to technical field of lithium-ion battery, particularly relate to a kind of preparation method of high-energy-density lithium battery pole slice.
Background technology
Along with communication, digital product are more and more lightening, simultaneously more and more higher to the requirement of device standby time, had higher requirement in the aspect such as energy density, cycle life, internal resistance of battery core.And at present when positive and negative electrode active material gram volume all performs to ultimate attainment, improve the technical bottleneck that battery core capacity has become field of lithium further.
As shown in Figure 1, in the production process of battery pole piece, no matter be positive plate A or negative plate B, all can leave the white space C of one section of uncoated active material in the end of pole piece, for spot welding lug D.Owing to needing to reserve the white space that can not apply active material on pole piece, this white space will take the useful space of battery core, not only affects the lifting of battery core energy density, and too increases the cost of battery core; Secondly, on existing pole piece, the thickness in region, lug position is large with other difference in thickness being coated with the region of active material, causes battery core evenness can not meet high-end customer demand.
In order to overcome the above problems, the patent No. be 201110294572.1 Chinese invention patent disclose a kind of preparation method of battery positive plate, steps of the method are: adopt nickel foam to do matrix, after nickel foam is depressed into desired thickness in advance, on the positive and negative of one side, symmetrical stickup one deck high temperature gummed tape, makes pole plate leave some space matrix in side to be connected with lug; Imported by anode sizing agent in stock tank, the nickel foam posting high temperature gummed tape, by stock tank, makes slurry be filled in the hole of nickel foam uniformly, and is struck off on nickel foam surface; The nickel foam pole plate being soaked with anode sizing agent is dried; Removing high temperature gummed tape, with twin rollers roll extrusion to desired thickness; By the nickel foam pole plate cut-parts pressed, make positive plate.Adopt the positive plate made of the method, except adopting the method for taping to reserve except tab welding region, active material is coated on whole pole plate completely, and therefore specific capacity is higher, internal resistance is lower and have high power characteristic.But the preparation technology of this pole plate attaches high-temp glue on pole piece, because the adhesion of gummed paper and empty paper tinsel exists always, remove in the process of gummed paper, the risk of pulling open foil is unavoidably there is during tearing gummed paper, and still may there is glue-line after removing rubberizing and stick to situation on sky paper tinsel, easily cause lug rosin joint when soldering polar ear, cause lug easily to come off from pole piece, thus affect battery core performance.
Summary of the invention
The object of the present invention is to provide a kind of pole piece preparation method that can improve battery core energy density and improve battery core flatness, the method can also reduce the empty paper tinsel consumption of battery core collector and barrier film consumption, reduces costs.
To achieve these goals, the present invention takes following technical solution:
The preparation method of electrodes of lithium-ion batteries, comprises the following steps:
Foaming gummed paper is sticked, containing blowing agent in the colloid of described foaming gummed paper in the tab welding district of foil;
Foil is coated with, foil and foaming gummed paper are covered by active material completely;
Sent in baking oven by foil after being coated with and carry out segmentation baking, described baking oven comprises some joint baking ovens, and wherein final section baking oven is high temperature oven, and the temperature of high temperature oven is the highest and higher than the blowing temperature of blowing agent in foaming gummed paper;
After foil leaves baking oven, with hairbrush, foaming gummed paper curling for the viscosity reduction through high-temperature baking is cleared away, make region, lug position expose sky paper tinsel;
Pole piece is toasted, roll-in, to cut and tab welding, complete the making of pole piece.
More specifically, after foaming gummed paper curling for viscosity reduction is cleared away by hairbrush, the gummed paper under adopting vacuum slot to be swept by hairbrush is collected.
More specifically, the temperature range of described high temperature oven setting is 115 ~ 140 DEG C.
More specifically, the baking time of described high temperature oven is 10 ~ 30 seconds.
From above technical scheme, the present invention attaches foaming gummed paper in the tab welding district of pole piece, apply completely active material and baking after, the gummed paper that will foam is removed, then by after normal process baking, roll-in, cutting, the region soldering polar ear preset, because the present invention is cover whole pole piece completely when applying active material, do not exist and stay white region, flatness and the battery core energy density on battery core surface can be improved, thus improve the cycle performance of battery core; And containing at high temperature can the blowing agent of foaming and intumescing in the foaming gummed paper glue-line that adopts of the present invention, foaming gummed paper is after high-temperature baking, blowing agent in glue-line to the affinity of bonding agent much larger than the affinity of foil to bonding agent, thus gummed paper viscosity can be reduced, prevent foil viscose glue, avoid and can pull open the risk of foil when removing foaming gummed paper, and glue-line can not be there is stick to situation on sky paper tinsel, lug firm welded can be ensured, thus improve battery core performance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention, simple introduction is done below by the accompanying drawing used required in embodiment or description of the prior art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the pole piece of prior art.
Fig. 2 to Fig. 8 b is the schematic diagram of the anode pole piece preparation process of the embodiment of the present invention.
Fig. 9 to Figure 13 is the schematic diagram of the cathode pole piece preparation process of the embodiment of the present invention.
Figure 14 is the schematic diagram of the battery core adopting the inventive method to prepare.
Embodiment
In order to allow above and other objects of the present invention, feature and advantage can be more obvious, the embodiment of the present invention cited below particularly, and coordinate appended diagram, be described below in detail.
The basic ideas of the inventive method are: at pole piece, the foaming gummed paper that can foam inharmonious under sticking high temperature as foil needed the region of soldering polar ear; Then the empty paper tinsel posting foaming gummed paper is coated with, makes active material by pole piece, comprise the region of posting gummed paper and cover completely; Sent in baking oven by the complete pole piece of coating and toast, pole piece is while baking, and the foamed glue on gummed paper also at high temperature expands, inharmonious, and curlingly micro-ly adheres on sky paper tinsel; After baking, foamed glue is swept down from pole piece, make pole-piece pole-ear position expose sky paper tinsel; Spot welding lug on the lug position of foamed glue isolation.
It is more than core concept of the present invention, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme of the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Set forth a lot of detail in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention, therefore the present invention is by the restriction of following public specific embodiment.
With a specific embodiment, pole piece preparation method of the present invention is described in detail below.
Prepared by the present embodiment, battery core is of a size of: length≤95.7mm, width=37.62 ± 0.6mm, thickness≤3.24;
The making step of positive plate is as follows:
Step 1, stick foaming gummed paper in the tab welding district of foil;
Stick the foaming gummed paper of two 10*40mm in the end of the aluminium foil of wide 120mm, between these two foaming gummed papers, be spaced apart 6 ± 1mm, between the foaming tip edge of gummed paper and the tip edge of aluminium foil, be spaced apart 5 ± 1mm, as shown in Figure 2; Then interval 388 ± 1mm pastes the foaming gummed paper that two are spaced apart 6 ± 1m again, iterative cycles like this, until empty for entire volume paper tinsel is all sticked foaming gummed paper;
Foaming gummed paper of the present invention is the gummed paper containing blowing agent in colloid, and the blowing agent in colloid can start to expand under specific blowing temperature, thus can reduce the adhered area of bonding agent and empty paper tinsel in colloid, reaches the object reducing gummed paper viscosity; Foaming gummed paper of the present invention is product sold on market, and what the present embodiment adopted is the model that Dongguan City Ao Zhong Electron Material Co., Ltd produces is 317H-3635 foaming gummed paper;
Step 2, the foil having pasted foaming gummed paper to be coated with, foil and foaming gummed paper to be covered by active material completely;
When being coated with empty paper tinsel, coating head is concordant with gummed paper, and painting cloth length is 389 ± 1mm, and coating width is 117 ± 1mm, and coated face density is 0.02085 ± 0.00025g/cm2; Pole piece after coating as shown in Figure 3;
Step 3, pole piece is sent into baking oven carry out segmentation baking, the temperature of final section baking oven is higher than the expansion critical temperature of blowing agent in foaming gummed paper, when pole piece enters final section baking oven, in gummed paper, blowing agent starts foaming and intumescing at such a temperature, gummed paper viscosity is reduced, and start curling in tension force effect, micro-ly adhere on sky paper tinsel; In this step, adjustable coater speed is to guarantee pole piece and go out baking oven and foamed glue curl synchronously completes;
Need through 9 joint baking ovens during positive plate baking, the temperature often saving baking oven setting is respectively 100 ± 5 DEG C, 105 ± 5 DEG C, 105 ± 5 DEG C, 105 ± 5 DEG C, 105 ± 5 DEG C, 105 ± 5 DEG C, 105 ± 5 DEG C, 105 ± 5 DEG C, 130 ± 5 DEG C; Wherein, the temperature difference of front 8 joint baking ovens is little, and the temperature of final section baking oven is higher than the temperature respectively saving baking oven above;
After step 4, pole piece leave baking oven, through coming unstuck station, come unstuck hairbrush station is provided with for clearing away foaming gummed paper, the foaming gummed paper that viscosity reduction is curling departs from pole piece under the active force of hairbrush, sky paper tinsel is exposed in region, pole-piece pole-ear position, as shown in Figure 4, vacuum slot hairbrush is swept under gummed paper collect;
Step 5, one side have been coated with rear repetition step 1-4, carry out rubberizing, coating, toast and operation of coming unstuck the another side of empty paper tinsel;
Stick the foaming gummed paper of 10*40mm in the another side end of aluminium foil, paste together again after the 404 ± 1mm of interval, iterative cycles like this until empty for entire volume paper tinsel has been pasted, as shown in Figure 5; Be coated with by one side painting parameter the pole piece back side, toast, come unstuck, the pole piece after coming unstuck as shown in Figure 6;
Step 6, coating is all completed to two sides and the pole piece of Degumming Procedures toasts, roll-in, cut;
Baking temperature is 85 ± 5 DEG C, and baking time is 4 hours; Roll-in thickness is 0.112 ± 3mm, then cuts by 89.3 ± 0.1mm between two parties, and the pole piece after cutting is respectively as shown in Fig. 7 a, Fig. 7 b and Fig. 7 c;
Step 7, soldering polar ear, complete the making of pole piece;
At the lug of lug position spot welding wide 6mm of pole piece, thick 0.08mm, the height of tab is 4.0 ± 0.25mm, and tab top is set to 5.0 ± 0.5mm apart from pole piece distance, and the pole piece after soldering polar ear respectively as figures 8 a and 8 b show.In abovementioned steps, the coating of pole piece and the baking after coming unstuck, roll-in, cut and be common process with tab welding.
Negative pole film-making making step is as follows:
Step 1, stick the foaming gummed paper of 10*40mm in the end of the Copper Foil of wide 120mm, foaming gummed paper bottom margin and Copper Foil bottom margin between be spaced apart 5 ± 1mm, interval 388 ± 1mm pastes one again, iterative cycles like this until the empty paper tinsel of an entire volume has been pasted, as shown in Figure 9;
Step 2, be coated with the empty paper tinsel having pasted foaming gummed paper, coating head surpasses gummed paper 19 ± 1mm, and painting cloth length is 382 ± 1mm, coating width is 117 ± 1mm, and coated face density is 0.01035 ± 0.00012g/cm2, and the pole piece after coating as shown in Figure 10;
Step 3, pole piece sent in baking oven and toasts, need through 11 joint baking ovens during negative plate baking, the temperature often saving baking oven setting is respectively: 80 ± 5 DEG C, 85 ± 5 DEG C, 90 ± 5 DEG C, 95 ± 5 DEG C, 95 ± 5 DEG C, 100 ± 5 DEG C, 100 ± 5 DEG C, 105 ± 5 DEG C, 95 ± 5 DEG C, 85 ± 5 DEG C, 120 ± 5 DEG C, the temperature of final section baking oven is higher than the temperature respectively saving baking oven above;
After step 4, pole piece leave baking oven, through the station that comes unstuck of tail, gummed paper curling for viscosity reduction is swept down from pole piece by hairbrush, and sky paper tinsel is exposed in region, pole-piece pole-ear position;
Step 5, the back side, negative plate back do not need to paste foamed glue, and be coated with by normal process the another side of empty paper tinsel, toast, the pole piece after coating as shown in figure 11;
Step 6, pole piece is carried out to roll-in, cuts, the pole piece after cutting as shown in figure 12;
Step 7, soldering polar ear, complete the making of pole piece;
To pole-piece pole-ear position spot welding wide 6mm, the lug of thick 0.08mm, the height of tab is 4.0 ± 0.25mm, and tab top is set to 5.0 ± 0.5mm apart from pole piece distance, after pole piece film-making as shown in figure 13;
Reel to the pole piece that above-mentioned film-making completes, core thickness distribution 2.65 ~ 2.85mm after winding, the core after winding as shown in figure 14.Adopt the battery core for preparing of the inventive method when battery core capacity is constant, the new thin 0.08mm of core structural rate original structure thickness, thickness qualification rate rises to 87% by 19%; Raffinate amount promotes 0.10g than original structure.
The present invention isolates foil and active contacts by the mode attaching foaming gummed paper in soldering polar ear region, expand at a certain temperature by the glue-line energy short time for this foaming gummed paper, make gummed paper viscosity reduce and curling, at the least significant end of baking station, one joint high temperature oven is set specially, the temperature of this high temperature oven is the highest, and be increased to the foaming window temperature of foamed glue, when pole piece is through this joint baking oven, blowing agent can foaming and intumescing at short notice, make foamed glue curl viscosity reduction, by external force, gummed paper is departed from again, thus make soldering polar ear region expose sky paper tinsel with soldering polar ear.The temperature range of high temperature oven setting of the present invention is 115 ~ 140 DEG C, and can adjust according to the foaming critical temperature of blowing agent and baking time, the baking time of high temperature oven is 10 ~ 30 seconds.
After the region that pole piece is left a blank because needing soldering polar ear originally changes into and attaches foaming gummed paper by the present invention, active material is made to cover whole pole piece completely again, flatness and the battery core energy density on battery core surface is improved with this, can produce with lower compacted density, improve the raffinate amount of battery core, thus improve the cycle performance of battery core.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to embodiment illustrated herein, but will meet the most wide region consistent with principle disclosed herein and features of novelty.
Claims (4)
1. the preparation method of electrodes of lithium-ion batteries, is characterized in that, comprises the following steps:
Foaming gummed paper is sticked, containing blowing agent in the colloid of described foaming gummed paper in the tab welding district of foil;
Foil is coated with, foil and foaming gummed paper are covered by active material completely;
Sent in baking oven by foil after being coated with and carry out segmentation baking, described baking oven comprises some joint baking ovens, and wherein final section baking oven is high temperature oven, and the temperature of high temperature oven is the highest and higher than the blowing temperature of blowing agent in foaming gummed paper;
After foil leaves baking oven, with hairbrush, foaming gummed paper curling for the viscosity reduction through high-temperature baking is cleared away, make region, lug position expose sky paper tinsel;
Pole piece is toasted, roll-in, to cut and tab welding, complete the making of pole piece.
2. the preparation method of electrodes of lithium-ion batteries according to claim 1, is characterized in that: after foaming gummed paper curling for viscosity reduction is cleared away by hairbrush, and the gummed paper under adopting vacuum slot to be swept by hairbrush is collected.
3. the preparation method of electrodes of lithium-ion batteries according to claim 1, is characterized in that: the temperature range of described high temperature oven setting is 115 ~ 140 DEG C.
4. the preparation method of the electrodes of lithium-ion batteries according to claim 1 or 3, is characterized in that: the baking time of described high temperature oven is 10 ~ 30 seconds.
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| CN105958114A (en) * | 2016-07-21 | 2016-09-21 | 新丰杰力电工材料有限公司 | Application method of thermosensitive adhesive tape in lithium ion battery and lithium battery |
| CN106207068A (en) * | 2016-08-29 | 2016-12-07 | 天津力神电池股份有限公司 | Bury the preparation method of lug formula pole piece |
| CN106229466A (en) * | 2016-08-29 | 2016-12-14 | 天津力神电池股份有限公司 | Bury the preparation method of lug formula pole piece, pole piece and lithium ion battery |
| CN106450494A (en) * | 2016-08-29 | 2017-02-22 | 天津力神电池股份有限公司 | Preparation method for tab-embedded type electrode plate, electrode plate and lithium ion battery |
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Application publication date: 20160406 |