CN102303007A - Method for coating electrode plate for lithium ion battery, electrode plate for lithium ion battery, and lithium ion battery - Google Patents
Method for coating electrode plate for lithium ion battery, electrode plate for lithium ion battery, and lithium ion battery Download PDFInfo
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- CN102303007A CN102303007A CN201110258939A CN201110258939A CN102303007A CN 102303007 A CN102303007 A CN 102303007A CN 201110258939 A CN201110258939 A CN 201110258939A CN 201110258939 A CN201110258939 A CN 201110258939A CN 102303007 A CN102303007 A CN 102303007A
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 86
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 238000000576 coating method Methods 0.000 title claims abstract description 64
- 239000011248 coating agent Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title abstract description 14
- 239000007772 electrode material Substances 0.000 claims abstract description 91
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 47
- 229910052799 carbon Inorganic materials 0.000 claims description 46
- 239000007788 liquid Substances 0.000 claims description 36
- 230000000994 depressogenic effect Effects 0.000 claims description 25
- 239000002002 slurry Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 15
- 238000001125 extrusion Methods 0.000 claims description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 7
- 239000010410 layer Substances 0.000 description 52
- 238000005516 engineering process Methods 0.000 description 24
- 230000008569 process Effects 0.000 description 11
- 239000000853 adhesive Substances 0.000 description 9
- 230000001070 adhesive effect Effects 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 6
- 238000004080 punching Methods 0.000 description 6
- 210000000498 stratum granulosum Anatomy 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000005030 aluminium foil Substances 0.000 description 4
- 239000011889 copper foil Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910032387 LiCoO2 Inorganic materials 0.000 description 1
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- -1 comprises housing Chemical compound 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002345 surface coating layer Substances 0.000 description 1
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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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- Cell Electrode Carriers And Collectors (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to the field of lithium ion batteries, and discloses a method for coating an electrode plate for a lithium ion battery, an electrode plate for a lithium ion battery, and a lithium ion battery. The electrode plate for the lithium ion battery comprises a current collector and an electrode material layer, wherein the electrode material layer is coated above the current collector, and the surface of the current collector is provided with a plurality of through holes and a plurality of raised parts and/or sunken parts. By using the structure, the electrode plate for the lithium ion battery is beneficial for the improvement of the bonding degree of the electrode material layer and the current collector and the increase of the thicknesses of electrode materials, thereby facilitating the improvement of capacity of the lithium ion battery.
Description
Technical field
The present invention relates to the lithium ion battery field, particularly the preparation method of the pole piece of a kind of positive/negative plate of lithium battery and lithium battery and lithium ion battery.
Background technology
Lithium ion battery is a kind of chargeable secondary cell; Lithium ion battery because have that capacity is big, safety and the lighter advantage of weight; Extensive use and various handheld terminal; Such as mobile phone, camera etc.; Even it can be carried out to assembly by battery pack and be widely used in various large-scale electric equipments to forming power battery pack, such as power vehicle etc.
Lithium ion battery mainly relies on lithium ion between positive pole and negative pole, to move work.In charge and discharge process, Li+ comes and goes embedding and takes off embedding between two electrodes: during rechargable battery, Li+ takes off embedding from positive pole, embeds negative pole through electrolyte, and negative pole is in rich lithium state; Then opposite during discharge.It is the representative of modern high performance battery.In lithium ion battery, anode or negative pole are used to adhere to the parent metal of active material, and for example the collector of Chang Yong negative pole (graphite) is a Copper Foil, and the collector of anodal (LiCoO2 etc.) is an aluminium foil.
Fig. 1 is the used collector cross-sectional view of a kind of lithium ion battery of the prior art; Used collector is aluminium foil, Copper Foil; Its electrode coated material thickness is limited; The capacity of battery is difficult to promote; Bad phenomenon such as the too thick easy generation pole piece dry linting of coating thickness, the decline of electrodes conduct performance, thus cause battery performance to be affected.
In addition, the amount of the capacity of lithium ion battery and the electrode material of collection liquid surface is closely related, and lithium ion that can the confession activity is many more, and discharge capacity is high more, and the discharge capacity of battery is high more, and then to expire service time of rechargable battery long more, the life that also is convenient for people to.
The inventor finds in carrying out research of the present invention, owing to concentrate the just face cementitiousness of body limited, so its surface coating layer is blocked up, is easy to generate the problem that above-mentioned electrode material comes off.
And along with the fast development of digital product, lithium ion battery applications more and more widely and has improved its performance demands, and high-capacity lithium ion cell is the development trend of lithium ion battery.And the problems referred to above of the prior art have limited the high power capacity development of lithium ion battery.
Summary of the invention
The embodiment of the invention first purpose is to provide: a kind of pole piece preparation method of lithium ion battery; Adopt this method to help increasing the adhesive bond degree of electrode material layer and collector; Help improving the thickness of electrode material, thereby help improving the capacity of lithium ion battery.
The embodiment of the invention second purpose is to provide: a kind of electrodes of lithium-ion batteries, and adopt this structure to help increasing the adhesive bond degree of electrode material layer and collector, help improving the thickness of electrode material, thereby help improving the capacity of lithium ion battery.
The embodiment of the invention the 3rd purpose is to provide: a kind of lithium ion battery, and adopt this structure to help increasing the adhesive bond degree of electrode material layer and collector, help improving the thickness of electrode material, thereby help improving the capacity of lithium ion battery.
The pole piece preparation method of a kind of lithium ion battery that the embodiment of the invention provides comprises:
Having plurality of through holes and surface on the surface has the collection liquid surface of a plurality of lug bosses or depressed part to be coated with the slurry of electrode material, obtains applying pole piece;
Dry said coating pole piece.
Alternatively, on the surface of said collector a plurality of lug bosses and depressed part are arranged.
Alternatively, in step: before the slurry of said collection liquid surface coating electrode material, also comprise:
Surface-coated conductive carbon layer at said collector to be coated;
Dry said coating pole piece;
The said collector of roll extrusion;
Step: at the slurry of said collection liquid surface coating electrode material, specifically:
Slurry to the said electrode material of conductive carbon layer surface coated of the said collector after the roll extrusion obtains said coating pole piece.
Alternatively, the thickness of said conductive carbon layer is less than or equal to 10 μ m more than or equal to 5 μ m.
Alternatively, being equal to or less than more than or equal to 100 degrees centigrade under 130 degrees centigrade the temperature range, dry said collector.
Alternatively, in step: the slurry of coating electrode material, obtain applying in the pole piece,
The slurry of said electrode material at the thickness of said collection liquid surface is: be less than or equal to 300 μ m more than or equal to 50 μ m.
The pole piece of a kind of lithium ion battery that the embodiment of the invention provides is characterized in that, comprising: collector, electrode material layer, and said electrode material layer is coated in the top of said collector;
Wherein, said collection liquid surface has plurality of through holes, and has a plurality of lug bosses and/or depressed part.
Alternatively, said pole piece also comprises: conductive carbon layer,
Said conductive carbon layer is between the surface and said electrode material layer of said collector, and the material of said conductive carbon layer sinks in each through hole of said collection liquid surface.
Alternatively, the thickness of said conductive carbon layer is less than or equal to 10 μ m more than or equal to 5 μ m.
A kind of lithium ion battery that the embodiment of the invention provides, the structure of its pole piece as stated.
Therefore, use the present embodiment technical scheme, because the collector that present embodiment adopted is tridimensional network, promptly has through hole and have lug boss or depressed part at collection liquid surface.With respect to collector smooth in the prior art; The collector in the present embodiment technical scheme and the contact area of electrode material (being bonded area) increase greatly; Improved coated side at collection liquid surface; Help strengthening the electrode material amount of collection liquid surface, help improving the capacity that finally utilizes the lithium ion battery that this pole piece obtains.
In addition; In in this enforcement; With respect to the smooth complete collector of available technology adopting; Collector in this enforcement is except surface irregularity; Also has through hole (this through hole can but be not limited to be uniform small pores distribute); Thereby make the electrode material that is coated with at collection liquid surface fully be absorbed in the through hole; And link together with another surperficial electrode material of collector; Promptly make the coat on collector two surfaces reach integrated bonding; Forming " pawl " shape with collector combines; Make that binder applied in electrode materials intensity is higher, more help with the coating thickness of electrode material do thicker, thereby promote the capacity of lithium ion battery.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute to improper qualification of the present invention, in the accompanying drawings:
Fig. 1 is the current collector structure sketch map of lithium ion battery in this prior art;
Preparation method's schematic flow sheet of the pole piece of a kind of lithium ion battery that Fig. 2 provides for the embodiment of the invention 1;
A kind of tridimensional network current collector structure sketch map of Fig. 3 for providing among the embodiment of the invention 1-4;
Fig. 4 is preparation method's schematic flow sheet of the pole piece of the kind lithium ion battery that provides in the embodiment of the invention 2;
Fig. 5 is the longitudinal cross-section structural representation of the pole piece of a kind of lithium ion battery of providing in the embodiment of the invention 3;
Fig. 6 is the longitudinal cross-section structural representation of the pole piece of the kind lithium ion battery that provides in the embodiment of the invention 4.
The specific embodiment
To combine accompanying drawing and specific embodiment to describe the present invention in detail below, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as to qualification of the present invention.
Embodiment 1:
Referring to shown in Figure 2, the preparation method of the pole piece of a kind of lithium ion battery that provides for present embodiment, referring to shown in Figure 2, this flow process mainly may further comprise the steps:
Step 201: cut-parts, collector wherein are three-dimensional netted collector.
This step can but be not limited to the current collector material of sheet carried out cut-parts according to the size and the capacity requirement of current lithium ion battery according to prior art.Be cut into the collector for use of confirming width.
In practical operation usually but be not limited to before the motor material coating; Earlier cut out the collector of rolling wide according to width collector; Obtain multireel width and the corresponding collector of pole piece width that needs; So that can carry out rolling in the coating process afterwards is coated with continuously; Speed production is carried out, but the present invention is not limited to this.
Collector in the embodiment of the invention is plus plate current-collecting body or the negative current collector in the lithium ion battery, such as Copper Foil or aluminium foil even or new discovery later on can be used as the other materials of affluxion body in lithium ion batteries.
Collector in this enforcement and collector of the prior art (referring to shown in Figure 3) institute difference comprises: embodiment of the invention collector 301 is that the collector mask has netted open-end hole 302, and be formed with a plurality of lug bosses or depressed part on the surface of the collector three-dimensional netted collector of (even both had lug boss also have depressed part).
Step 202: electrode material coating.
Adopt coating machine,, make electrode material be coated on the surface of conductive carbon layer at collection liquid surface coating electrode material slurry.
Coating in the present embodiment specifically can be adopted pole piece coating machine of the prior art; Pass through transmission mechanism; Collector to be coated is carried the slurry outlet through coating machine; Be provided with the slit of the certain altitude that can supply the pole piece process at the slurry outlet place, can control the thickness that is coated on the electrode material on the collector like this.
In the control of coating uniformity, can carry out discharging and be coated with inhomogeneity adjustment through slurry discharging adjusting parts are set at slurry outlet.Wherein so-called uniformity comprises stability, uniformity and discharging opening discharging situation everywhere of load etc.
In coating process, can utilize parts such as correcting device that the smoothness and the accuracy of collector transmission are controlled, avoid the conveying generation deviation of collector, influence coating effect and manufacturing schedule.
In this step, when current pole piece was positive plate, the material of coating was the lithium salts positive electrode that contains the active lithium ion, and when current pole piece was negative plate, the material of coating was a carbon.
Step 203: pole piece oven dry.
The pole piece that will carry out after pole piece material is coated with is sent into drying chamber or dryer, carries out stoving process and handles.
Bake out temperature in the present embodiment can but be not limited to be set at: be equal to or less than 130 degrees centigrade temperature range, promptly 100 ℃ more than or equal to 100 degrees centigrade--130 ℃.
Follow-up, the pole piece that obtains can be cut out farm labourer skill, specifically be that it is cut into definite length according to battery capacity, carry out then that lithium ion battery is reeled, lithium ion is gone into technologies such as shell, fluid injection and obtained lithium ion battery.
Need to prove; The above-mentioned technology of present embodiment both can be applied to the rigid housing battery; Also can be used for various lithium ion batteries such as polymer Soft Roll lithium ion battery,, all fall into the scope of the present invention's protection as long as the pole piece coating process of its anodal perhaps negative pole as stated.
Prove through inventor's long-term experiment, use the present embodiment technical scheme, can make electrode material thickness and be less than or equal to 300 μ m more than or equal to 50 μ m, promptly electrode material coating thickness scope can widely reach: 50 μ m--300 μ m.
Therefore, because the collector that present embodiment adopted is tridimensional network, promptly has through hole and have lug boss or depressed part at collection liquid surface.With respect to collector smooth in the prior art; The collector in the present embodiment technical scheme and the contact area of electrode material (being bonded area) increase greatly; Improved coated side at collection liquid surface; Help strengthening the electrode material amount of collection liquid surface, help improving the capacity that finally utilizes the lithium ion battery that this pole piece obtains.
In addition; In in this enforcement; With respect to the smooth complete collector of available technology adopting; Collector in this enforcement is except surface irregularity; Also has through hole (this through hole can but be not limited to be uniform small pores distribute); Thereby make the electrode material that is coated with at collection liquid surface fully be absorbed in the through hole; And link together with another surperficial electrode material of collector; Promptly make the coat on collector two surfaces reach integrated bonding; Forming " pawl " shape with collector combines; Make that binder applied in electrode materials intensity is higher, more help with the coating thickness of electrode material do thicker, thereby promote the capacity of lithium ion battery.
Need to prove, in order further to strengthen the contact area of present embodiment collector matrix and conductive carbon layer, electrode material layer, can also adopt the surface to have through hole, and the surface promptly is provided with the collector that lug boss also is provided with depressed part.Easy to process and attractive in appearance for lug boss, depressed part can promptly be provided with the depressed part to back side depression so that its surperficial lug boss and depressed part match setting each other between per two lug bosses.
Wherein, the through hole in the present embodiment collector can but be not limited to adopt punching press, punching or technologies such as corrosion to make, lug boss wherein, depressed part can but be not limited to adopt technologies acquisitions such as punching press, corrosion.Its obtain this kind structure collector technology can but be not limited to prior art.
Embodiment 2:
The preparation method of the another kind of electrodes of lithium-ion batteries that provides for present embodiment shown in Figure 4, referring to shown in Figure 3, this flow process mainly may further comprise the steps:
Step 401: cut-parts, collector wherein are three-dimensional netted collector.
The step 201 of this step in can reference implementation example 1.
Referring to shown in Figure 2; Collector in this enforcement and collector of the prior art (referring to shown in Figure 3) institute difference comprises: embodiment of the invention collector 301 is that the collector mask has netted open-end hole 302, and be formed with a plurality of lug bosses or depressed part on the surface of the collector three-dimensional netted collector of (even promptly have lug boss also have depressed part).
Step 402: coated with conductive carbon-coating.
Surface-coated one conductive carbon layer of collector for use after cutting.
Carrying out conductive carbon layer when applying, specifically can but be not limited to adopt coating machine the conductive carbon material of pulp-like to be applied to the surface of the three-dimensional netted collector of step 401.
Carry out finding in the experiment of the present invention the inventor, be coated in the present embodiment this collection liquid surface this conductive carbon layer thickness can but be not limited to be less than or equal to 10 μ m more than or equal to 5 μ m, promptly thickness range is 5 μ m--10 μ m.
Step 403: oven dry.
Collector behind the coated with conductive carbon-coating is sent into drying chamber or dryer, carry out stoving process.
Bake out temperature in the present embodiment can but be not limited to be set at: be equal to or less than 130 degrees centigrade temperature range, promptly 100 ℃ more than or equal to 100 degrees centigrade--130 ℃.
Step 404: roll extrusion.
Collector to after the step 403 place dried carries out roll extrusion.This roll extrusion specifically can but be not limited to adopt automatic conveying equipment with the roller of collector through two relative motions, and can adjust gap between the roller as required with the pressure of the collector that passes through in the middle of the adjustment pair of rollers.
Can cover the surface of collector further that the conductive carbon layer that is coated on collection liquid surface is more closely knit, equably through rolling technology.
Step 405: electrode material coating.
This step is not given unnecessary details at this referring among the embodiment 1 shown in the step 102.
Step 406: oven dry pole piece.
The content of this step specifically referring to the record of step 203 among the embodiment 1, is not given unnecessary details at this.
Follow-up, the pole piece that obtains can be cut out farm labourer skill, specifically be that it is cut into definite length according to battery capacity, carry out then that lithium ion battery is reeled, lithium ion is gone into technologies such as shell, fluid injection and obtained lithium ion battery.
The difference of present embodiment and embodiment 1 mainly is:
Present embodiment in advance in surface-coated one deck conductive carbon layer of collector, and further adopted rolling technology to handle after oven dry before three-dimensional netted collector carries out electrode material coating, just carried out the coating of electrode material then.The present embodiment technical scheme also further has following beneficial effect except the beneficial effect with embodiment 1:
1, before carrying out the electrode material coating, apply the conductive carbon layer that one deck is mixed with conductive material at the collector matrix surface in advance, this conductive carbon layer helps improving the electric conductivity of collector.
2, behind the coated with conductive carbon-coating, also dry successively and roll extrusion is handled, make this be coated in conductive carbon layer collection liquid surface, dry further under the effect of pressure, " pawl " adhesive bond is on the surface of collector matrix more securely.
3; With respect to the prior art that directly is coated with electrode material at smooth collection liquid surface; Present embodiment is through precoating conductive carbon layer surface; Then this firmly " pawl " shape bonding connection go up the electrode material of coating on the conductive carbon layer of collection liquid surface surface (matsurface of fine particle shape); Electrode material layer and conductive carbon layer belong to the bonding of stratum granulosum and stratum granulosum; Be equivalent to the bonding between prior art midplane shiny surface and the stratum granulosum; The bonding of this enforcement is tightr; The adhesive bond degree is stronger; Help improving the thickness of electrode material coating, and then help improving the capacity of lithium ion battery.
To sum up, use the present embodiment technical scheme, for small-capacity cells, the caking ability that it helps improving electrode material and collector prevents in use to come off easily, thereby improves its electric conductivity; Improve the adhesive bond intensity of electrode material and collector owing to it on the other hand, thereby helped improving the thickness of electrode material, helped improving the capacity of battery, be beneficial to the development of technology.
Contrast test:
Comparative Examples: adopt prior art, directly be coated with electrode material on the smooth sheet collector in the prior art;
Inventive embodiments: adopt the present embodiment technical scheme, on three-dimensional netted collector, be coated with conductive carbon layer, then at conductive carbon layer surface coated electrode material.
Coating machine: Shenzhen is great can Science and Technology Ltd. dispatch from the factory continuous blade coating coating machine, model is GR-GU500-12C.
Table one: experimental data is contrast table as a result
Embodiment 3:
Lithium ion mainly comprises housing, coiling body (being electric core) and electrolyte.Wherein electrolyte and coiling body are arranged in the housing, and this coiling body is immersed in the electrolyte.This coiling body is reeled by range upon range of positive plate, barrier film and negative plate and is formed, and its septation is between positive plate and negative plate.
Referring to shown in Figure 5, (positive and negative) pole piece comprises: collector 201 and the electrode material layer above said collector.Referring to shown in Figure 3; Collector 301 in this enforcement mainly comprises with collector 101 of the prior art (referring to shown in Figure 1) institute difference: embodiment of the invention collector 301 is that collection liquid surface has netted open-end hole 302, and be formed with a plurality of lug bosses or depressed part on the surface of the collector 301 three-dimensional netted collector of (even promptly have lug boss also have depressed part).
Specifically for positive plate, its collector can but be not limited to three-dimensional netted Copper Foil, its electrode material layer 501 is the lithium salts material layer, such as LiFePO 4 material layer or other lithium ion materials;
For negative plate, its collector can but be not limited to three-dimensional netted aluminium foil, its electrode material is a carbon-coating.
Positive plate in the lithium ion battery that present embodiment provides and/or negative plate can but be not limited to adopt the technology shown in the embodiment 1 to process.
Need to prove; The above-mentioned technology of present embodiment both can be applied to the rigid housing battery; Also can be used for various lithium ion batteries such as polymer Soft Roll lithium ion battery,, all fall into the scope of the present invention's protection as long as the pole piece coating process of its anodal perhaps negative pole as stated.
Prove through inventor's long-term experiment, use the present embodiment technical scheme, can make electrode material thickness and be less than or equal to 300 μ m more than or equal to 50 μ m, promptly electrode material coating thickness scope can widely reach: 50 μ m--300 μ m.
Therefore, because the collector that present embodiment adopted is tridimensional network, promptly has through hole 302 and have lug boss or depressed part at collection liquid surface.With respect to collector smooth in the prior art; The collector in the present embodiment technical scheme and the contact area of electrode material (being bonded area) increase greatly; Improved coated side at collection liquid surface; Help strengthening the electrode material amount of collection liquid surface, help improving the capacity that finally utilizes the lithium ion battery that this pole piece obtains.
Further; In in this enforcement; With respect to the smooth complete collector of available technology adopting; Collector in this enforcement is except surface irregularity; Also have this through hole 302 of through hole 302(can but be not limited to be uniform small pores and distribute); Thereby make the electrode material that is coated with at collection liquid surface fully be absorbed in the through hole 302; And link together with another surperficial electrode material of collector; Promptly make the coat on collector two surfaces reach integrated bonding; Forming " pawl " shape with collector combines; Make that binder applied in electrode materials intensity is higher, more help with the coating thickness of electrode material do thicker, thereby promote the capacity of lithium ion battery.
Need to prove, in order further to strengthen the contact area of present embodiment collector matrix and conductive carbon layer, electrode material layer 501, can also adopt the surface to have through hole 302, and the surface promptly is provided with the collector that lug boss also is provided with depressed part.Easy to process and attractive in appearance for lug boss, depressed part can promptly be provided with the depressed part to back side depression so that its surperficial lug boss and depressed part match setting each other between per two lug bosses.
Wherein, the through hole 302 in the present embodiment collector can but be not limited to adopt punching press, punching or technologies such as corrosion to make, lug boss wherein, depressed part can but be not limited to adopt technologies acquisitions such as punching press, corrosion.Its obtain this kind structure collector technology can but be not limited to prior art.
Embodiment 4:
Referring to shown in Figure 6, present embodiment mainly is with respect to 3 differences of embodiment:
Be separated with conductive carbon layer 502 between going back between the positive plate of the lithium ion battery that present embodiment provides and/or the collector of negative plate and the electrode material layer 601; This conductive carbon layer 502 is coated in the surface of collector; And the material in the conductive carbon layer 502 is absorbed in the through hole 302 in the collector, is two surfaces that " pawl " dress is bonded in collector.This electrode material (carbon or lithium ion material) is coated in the surface of this conductive carbon layer 502.
Carry out finding in the experiment of the present invention the inventor, be coated in the present embodiment this collection liquid surface this conductive carbon layer 502 thickness can but be not limited to be less than or equal to 10 μ m more than or equal to 5 μ m, promptly thickness range is 5 μ m--10 μ m.
Positive plate/negative plate in the lithium ion battery shown in the present embodiment can but be not limited to adopt the technological process shown in the embodiment 2 to process.
The difference of present embodiment and embodiment 3 mainly is: before three-dimensional netted collector carries out the electrode material coating; In advance in surface-coated one deck conductive carbon layer 502 of collector; And after oven dry, further adopt rolling technology to handle, just carry out the coating of electrode material then.The present embodiment technical scheme also further has following beneficial effect except the beneficial effect with embodiment 1:
1, before carrying out the electrode material coating, apply the conductive carbon layer 502 that one deck is mixed with conductive material at the collector matrix surface in advance, this conductive carbon layer 502 helps improving the electric conductivity of collector.
2, the material that tightly is coated in the conductive carbon layer 502 of collection liquid surface sinks in the through hole 302 of this three-dimensional netted collector, promptly is the integrated adhesive bond of " pawl " shape on two surfaces of collector matrix, and its adhesion strength is stronger.
3; With respect to the prior art that directly is coated with electrode material at smooth collection liquid surface; Present embodiment is through precoating conductive carbon layer 502 surfaces; Then this firmly " pawl " shape bonding connection go up the electrode material of coating on conductive carbon layer 502 surfaces of collection liquid surface (matsurface of fine particle shape); Electrode material layer 601 and conductive carbon layer 502 belong to the bonding of stratum granulosum and stratum granulosum; Be equivalent to the bonding between prior art midplane shiny surface and the stratum granulosum; The bonding of this enforcement is tightr; The adhesive bond degree is stronger; Help improving the thickness of electrode material coating, and then help improving the capacity of lithium ion battery.
To sum up.Use the present embodiment technical scheme, for small-capacity cells, use the caking ability that the present embodiment technical scheme helps improving electrode material and collector, prevent in use to come off easily, thereby improve its electric conductivity; Improve the adhesive bond intensity of electrode material and collector owing to it on the other hand, thereby helped improving the thickness of electrode material, helped improving the capacity of battery, be beneficial to the development of technology.
Contrast test:
Comparative Examples: adopt prior art, directly be coated with electrode material on the smooth sheet collector in the prior art, adopt the pole piece that this technology obtains and the manufacturing capacity is the 1000mAh lithium ion battery;
Inventive embodiments: adopt the present embodiment technical scheme, on three-dimensional netted collector, be coated with conductive carbon layer,, adopt the pole piece that this technology obtains and make lithium ion battery with volume then at conductive carbon layer surface coated electrode material.
Coating machine: Shenzhen is great can Science and Technology Ltd. dispatch from the factory continuous blade coating coating machine, model is GR-GU500-12C.
Table two: data comparative analysis form
Therefore, compare in the prior art, adopt this technical application scheme, electrode material thickness can improve three times.The coating layer thickness that adopts present embodiment to obtain is the pole piece of 300um; With respect to prior art floating coat thickness is the pole piece of 100um; The peel strength of electrode material is almost 2 times of prior art, and after being made into battery, cycle performance is than using common foil battery to have capacity to promote 20%.
To sum up, adopt the present embodiment technical scheme, can improve the peel strength of the electrode material on the pole piece greatly on the one hand, and help improving the capacity of lithium ion battery.
More than the technical scheme that the embodiment of the invention provided has been carried out detailed introduction; Used concrete example among this paper the principle and the embodiment of the embodiment of the invention are set forth, the explanation of above embodiment only is applicable to the principle that helps to understand the embodiment of the invention; Simultaneously, for one of ordinary skill in the art, according to the embodiment of the invention, the part that on the specific embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. the coating process of an electrodes of lithium-ion batteries is characterized in that, comprising:
Having plurality of through holes and surface on the surface has the collection liquid surface of a plurality of lug bosses or depressed part to be coated with the slurry of electrode material, obtains applying pole piece;
Dry said coating pole piece.
2. the coating process of electrodes of lithium-ion batteries according to claim 1 is characterized in that,
On the surface of said collector a plurality of lug bosses and depressed part are arranged.
3. the coating process of electrodes of lithium-ion batteries according to claim 1 and 2 is characterized in that,
In step: before the slurry of said collection liquid surface coating electrode material, also comprise:
Surface-coated conductive carbon layer at said collector to be coated;
Dry said coating pole piece;
The said collector of roll extrusion;
Step: at the slurry of said collection liquid surface coating electrode material, specifically:
Slurry to the said electrode material of conductive carbon layer surface coated of the said collector after the roll extrusion obtains said coating pole piece.
4. the coating process of electrodes of lithium-ion batteries according to claim 1 and 2 is characterized in that,
The thickness of said conductive carbon layer is less than or equal to 10 μ m more than or equal to 5 μ m.
5. the coating process of electrodes of lithium-ion batteries according to claim 1 and 2 is characterized in that,
Being equal to or less than more than or equal to 100 degrees centigrade under 130 degrees centigrade the temperature range, dry said collector.
6. the coating process of electrodes of lithium-ion batteries according to claim 1 and 2 is characterized in that,
In step: the slurry of coating electrode material, obtain applying in the pole piece,
The slurry of said electrode material at the thickness of said collection liquid surface is: be less than or equal to 300 μ m more than or equal to 50 μ m.
7. the pole piece of a lithium ion battery is characterized in that, comprising: collector, electrode material layer, and said electrode material layer is coated in the top of said collector;
Wherein, said collection liquid surface has plurality of through holes, and has a plurality of lug bosses and/or depressed part.
8. the pole piece of a kind of lithium ion battery according to claim 7 is characterized in that,
Said pole piece also comprises: conductive carbon layer,
Said conductive carbon layer is between the surface and said electrode material layer of said collector, and the material of said conductive carbon layer sinks in each through hole of said collection liquid surface.
9. the pole piece of a kind of lithium ion battery according to claim 7 is characterized in that,
The thickness of said conductive carbon layer is less than or equal to 10 μ m more than or equal to 5 μ m.
10. lithium ion battery that comprises claim 7 or 8 or 9 said pole pieces.
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| CN201110258939A CN102303007A (en) | 2011-09-02 | 2011-09-02 | Method for coating electrode plate for lithium ion battery, electrode plate for lithium ion battery, and lithium ion battery |
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