CN220065737U - Thick pole piece structure of battery - Google Patents
Thick pole piece structure of battery Download PDFInfo
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- CN220065737U CN220065737U CN202321104215.9U CN202321104215U CN220065737U CN 220065737 U CN220065737 U CN 220065737U CN 202321104215 U CN202321104215 U CN 202321104215U CN 220065737 U CN220065737 U CN 220065737U
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- active material
- material layer
- current collector
- pole piece
- battery
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- 239000011149 active material Substances 0.000 claims abstract description 167
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 239000010410 layer Substances 0.000 claims description 139
- 229910001415 sodium ion Inorganic materials 0.000 claims description 27
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical group [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 claims description 24
- 239000011888 foil Substances 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 239000002345 surface coating layer Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims 3
- 239000002245 particle Substances 0.000 description 37
- 238000000034 method Methods 0.000 description 19
- 229910052751 metal Inorganic materials 0.000 description 16
- 239000002184 metal Substances 0.000 description 16
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 15
- 229910001416 lithium ion Inorganic materials 0.000 description 15
- 239000013543 active substance Substances 0.000 description 13
- 239000011230 binding agent Substances 0.000 description 6
- 210000001787 dendrite Anatomy 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 229910010272 inorganic material Inorganic materials 0.000 description 4
- 239000011147 inorganic material Substances 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920006280 packaging film Polymers 0.000 description 4
- 239000012785 packaging film Substances 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 210000004027 cell Anatomy 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000676 Si alloy Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- ZVLDJSZFKQJMKD-UHFFFAOYSA-N [Li].[Si] Chemical compound [Li].[Si] ZVLDJSZFKQJMKD-UHFFFAOYSA-N 0.000 description 2
- 229910001413 alkali metal ion Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009830 intercalation Methods 0.000 description 2
- 230000002687 intercalation Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000012858 packaging process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000002210 silicon-based material Substances 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The utility model discloses a thick pole piece structure of a battery, which comprises a current collector and an active material layer positioned on the surface of the current collector; the surface of the current collector is provided with micro pits; the active material layers are of a multi-layer structure, and a microstructure is arranged between two adjacent active material layers; the surface of the outermost active material layer is provided with a coating; the utility model can improve the binding force between the current collector and the active material layer, can improve the binding force inside the thick pole piece, can improve the multiplying power performance and the long cycle performance of the thick pole piece battery, and can improve the safety performance of the thick pole piece battery.
Description
Technical Field
The utility model belongs to the field of batteries, and particularly relates to a thick pole piece.
Background
With the rapid development of new energy industry, the requirements on the comprehensive performance of the battery are increasingly increased, and the battery capacity and the cost performance are mainly concentrated; the battery with the same capacity can be used for preparing the thick pole piece by increasing the coating amount of the electrode, so that the number of layers of the thick pole piece, the use amount of foil materials and the use amount of diaphragms can be reduced, and the double effects of improving the energy density and reducing the cost can be achieved. The existing method for preparing the thick pole piece is mostly to coat a thicker active material layer on a current collector and roll the active material layer to improve the compaction density;
the thick pole piece has two problems:
on one hand, the thickness of the thick pole piece is increased, so that the corresponding ion transmission is more difficult, and the multiplying power performance of the thick pole piece is poor compared with that of a conventional thick pole piece; particularly, in the later cycle of the battery, electrolyte in the battery is consumed in a large amount, so that part of active substances cannot contact the electrolyte, ion transmission is difficult, the problem is more serious in the thick-pole-piece battery, abrupt large-scale capacity decay of the thick-pole-piece battery in the later cycle is easy to cause, and the long cycle performance of the thick-pole-piece battery is influenced;
on the other hand, the thick pole piece is easy to fall off powder, and the reason for the falling powder is that in the process of forming a battery cell by soft winding of the thick pole piece, the winding process causes larger difference of curvatures of different thicknesses of the thick pole piece, so that the active material layer is easy to be separated from the current collector; if the roller pressure is increased on the basis of the conventional roller pressure, although the risk of falling of the thick pole piece is reduced, too small gaps are formed in the active material layer of the thick pole piece, so that the permeation of electrolyte is greatly problematic, the transfer of active lithium ions or sodium ions in the thick pole piece of the battery is affected, and the rate performance and the high-current charge-discharge performance are particularly reduced.
On the other hand, the thick pole piece is difficult to transmit ions, so that the current on the surface of the thick pole piece is concentrated, alkali metal dendrites are easy to form on the surface of the thick pole piece, and the dendrites are generated to puncture the isolating film so as to conduct the positive pole and the negative pole of the pole piece, thereby causing potential safety hazards.
Disclosure of Invention
In order to solve the defects in the prior art, the utility model discloses a thick pole piece structure of a battery, wherein the thick pole piece comprises a current collector and an active material layer positioned on the surface of the current collector;
wherein, the surface of the current collector is provided with micro pits;
the active material layers are of a multi-layer structure, and a microstructure is arranged between two adjacent active material layers, wherein the microstructure refers to a convex or concave structure with the width of 1-5 mm;
the surface of the outermost active material layer is provided with a coating layer, the coating layer is composed of inorganic material particles, such as alumina particles and zirconia particles, and the inorganic material particles can prevent dendrites from growing on the surface of the pole piece and prevent the dendrites from puncturing the isolating film to bring potential safety hazards.
The width of the micro pits is 10-50 micrometers, and the surface density of the micro pits is 80-100 points/mm 2 The upper surface of the current collector is provided with the micro-pits; the lower surface of the current collector is provided with the micro-pits; as shown in fig. 7, the micro-pits on the upper surface of the current collector are staggered from the micro-pits on the lower surface of the current collector; the active material layer can be arranged on the upper surface and the lower surface of the current collector, when the current collector is thin, the micro pits on the upper surface and the lower surface of the current collector are preferably staggered, so that the micro pits on the upper surface and the lower surface are prevented from extruding the cross-section space of the current collector; since the current collector is also required to be rolled after being coated with the active material, and the electrode plate expands during the cycle of the finished battery, so that extrusion force is formed on the current collector, all factors may cause the current collector to be broken, so that the active material on the electrode plate cannot form electric contact, if the current collector is thinner, the current collector is easy to generate broken pieces or microcracks, and therefore, the micro pits on the upper surface and the lower surface are preferably staggered as shown in fig. 7.
The current collector is aluminum foil, the current collector is a negative current collector, the thickness of the pole piece is larger than 1mm, and the pole piece thickness calculating method comprises the step of adding the thicknesses of active substances coated on the upper surface and the lower surface of the current collector before the current collector is used for manufacturing a battery cell after the preparation of a positive pole piece or a negative pole piece is completed; in one embodiment of the utility model, the thickness of the negative electrode plate comprises a negative electrode current collector aluminum foil, an upper active material layer and a lower active material layer; the structure of the utility model is beneficial only for batteries composed of thick pole pieces, otherwise, the structure of the utility model is not needed if the battery is a thin pole piece, if the process complexity of the thin pole piece is increased, the thickness of the positive pole piece and the negative pole piece of the conventional lithium ion or sodium ion battery is 100-500um, and under the thickness of the pole piece of 500um, the requirement of the binding force of the pole piece, including the binding force between a current collector and an active substance layer, can be met through a rolling procedure after one-time coating; the thickness of the positive and negative plates is 500-1000um, the positive and negative plates can be rolled by one-time coating, and in the packaging process, the positive and negative plates are tightly packaged by a packaging film or a fastener is arranged on the periphery of an electric core (a structure formed by winding or laminating the positive and negative plates and an isolating film) in the packaging film, so that the electric core is compacted; the process cannot be realized when the thickness of the electrode plate exceeds 1mm, because electrolyte is consumed to generate SEI and other processes along with the charge and discharge of the battery, the electrode plate is thickened, and even the thickness of the electrode plate can be increased and decreased along with the charge and discharge, such as the electrode plate with charge expansion characteristics, such as a silicon anode, a tin anode, a sulfur anode and the like, when the electrode plate is charged, the thickness of the electrode plate is thickened along with the intercalation or alloying of alkali metal ions (lithium ions or sodium ions), such as the silicon material is used as an active substance to be alloyed with the lithium ions to form lithium silicon alloy, the volume expansion of the active substance exceeds 300 percent, and the volume of the active substance is reduced after lithium removal, so that the binding force between the active substance and a current collector is deteriorated; the binding force between the current collector and the active material layer is improved by manufacturing the microstructure on the surface of the current collector, and the binding force of the pole piece is improved by the pinning effect of the microstructure on the active material layer.
The active material layer comprises a first upper active material layer arranged on the upper surface of the current collector, a second upper active material layer arranged on the upper surface of the first upper active material layer, and a third upper active material layer arranged on the upper surface of the second upper active material layer;
the active material layer further comprises a first lower active material layer arranged on the lower surface of the current collector, a second lower active material layer arranged on the lower surface of the first lower active material layer, and a third lower active material layer arranged on the lower surface of the second lower active material layer.
The outermost active material layer includes the third upper active material layer and the third lower active material layer.
The upper surface of the first upper active material layer is provided with a first upper microstructure; the upper surface of the second upper active material layer is provided with a second upper microstructure; the upper surface of the third upper active material layer is provided with a third upper microstructure;
the lower surface of the first lower active material layer is provided with a first lower microstructure; the lower surface of the second lower active material layer is provided with a second lower microstructure; the lower surface of the third lower active material layer is provided with a third lower microstructure.
The third upper active material layer comprises a third upper active material upper surface and an upper surface coating layer positioned on the third upper active material upper surface; the third lower active material layer comprises a third lower active material lower surface and a lower surface coating layer positioned on the third lower active material lower surface.
The third upper layer microstructure includes first and second grooves disposed crosswise.
The first grooves are multiple and are arranged in parallel; the second grooves are multiple, and the second grooves are arranged in parallel.
The battery is a sodium ion battery, the current collector is a negative current collector of the sodium ion battery, and the theoretical capacity of the sodium ion battery is lower than that of the lithium ion battery, but the theoretical price of the sodium ion battery is lower than that of the lithium ion battery, so that in order to better utilize the price advantage of the sodium ion battery, the pole piece of the sodium ion battery needs to be made thicker, thereby improving the theoretical capacity of the sodium ion battery, and the structure of the utility model is more suitable for the sodium ion battery.
In the step S1, the current collector can be rolled by a roller to form micro pits on the surface of the current collector, wherein the width of each micro pit is not smaller than the average particle size of active material particles in the active material, the width of each micro pit is 10-50 micrometers, and the surface density of each micro pit is 80-100 points/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The roller is subjected to laser texturing treatment in advance, so that the surface of the roller is uniformly distributed with the spurs, and the tips of the spurs form in the process of rolling the current collectorMicropits on the surface of the current collector. The current collector can be aluminum foil serving as a negative current collector of a lithium ion battery, a negative current collector of a sodium ion battery or a positive current collector of the sodium ion battery; the current collector can also be copper foil used as a positive current collector of the lithium ion battery. In the existing battery system, the average grain diameter of the negative electrode graphite particles is generally below 20um, some of the negative electrode graphite particles are below 10um, the average grain diameter of the positive electrode lithium iron phosphate is generally below 10um, the average grain diameters of the lithium cobaltate and the lithium manganate are generally below 10-20um, the evaluation grain diameter of the positive electrode ternary material is also generally below 20um, the active material particles are coated on the surface of the metal current collector together through the binder and dried, the binding force between the active material layer and the metal current collector can be improved through the arrangement of the micro pits, when the width of the micro pits is larger than the average grain diameter of the active material particles, more active material particles are in the micro pits on the binding surface of the metal current collector and the active material layer, and the binder is simultaneously present in the micro pits, so that the binding force between the active material layer and the metal current collector can be increased together, meanwhile, the electric contact area between the active material layer and the metal current collector is larger, and the rate performance of the whole battery is better; if the width of the micro-pits is smaller than the average particle diameter of the active material particles, most of the micro-pits are filled with the binder and a small amount of active material particles, so that the direct binding force between the active material layer and the metal current collector is relatively small, and meanwhile, the electric contact area between the active material layer and the metal current collector is relatively small, and the rate capability of the whole battery is relatively reduced; however, regardless of whether the width of the micropits is larger than the average particle diameter of the active material particles, the binding force between the active material layer and the metal current collector is larger than that in the absence of micropits, and the hardness of the spur is larger than 850.
The utility model has the following advantages:
according to the utility model, the active material layers are arranged in the thick pole piece, and the microstructure is arranged between two adjacent active material layers, so that the binding force between the adjacent active material layers is improved, and the occurrence of powder falling is reduced;
meanwhile, the micro-pit structure is arranged on the surface of the current collector, so that the binding force between the current collector and an active material layer close to the current collector is improved, and the occurrence of powder falling is reduced;
the surface area of the thick pole piece is increased by arranging the first groove and the second groove on the surface of the thick pole piece, so that the current density is reduced, and the rate capability of the battery is improved;
by arranging the coating on the surface of the active material layer of the thick pole piece, the safety performance of the thick pole piece is improved.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described.
FIG. 1 is a top view of a thick pole piece of the present utility model and an EE cut position schematic.
Fig. 2 is a schematic drawing of a thick pole piece after EE cutting and illustrating an H-enlarged position and an F-enlarged position of the present utility model.
Fig. 3 is an enlarged position schematic view of the present utility model H.
Fig. 4 is an enlarged schematic view of the position of the utility model F.
Fig. 5 is a schematic view of the structure of the thick electrode sheet of the present utility model before coating the third active material layer.
Fig. 6 is a schematic diagram of the structure of the thick electrode sheet of the present utility model before coating with a second active material layer.
Fig. 7 is a schematic cross-sectional view of a current collector of a thick pole piece of the present utility model.
| 1 | Current collector |
| 10 | Micro pit |
| 210 | A first upper active material layer |
| 211 | First lower active material layer |
| 220 | Second upper active material layer |
| 221 | Second lower active material layer |
| 230 | Third upper active material layer |
| 231 | Third lower active material layer |
| 2101 | First upper layer microstructure |
| 2201 | A second upper layer microstructure |
| 2301 | Third upper layer microstructure |
| 2111 | First underlying microstructure |
| 2211 | A second underlying microstructure |
| 2311 | Third underlying microstructure |
| H | Upper layer microstructure amplifying position |
| F | Lower microstructure amplifying position |
| 2302 | Upper surface of third upper active material |
| 2303 | Top surface coating |
| 2312 | Third lower active material lower surface |
| 2313 | Lower surface coating |
| 23011 | First groove |
| 23012 | Second groove |
Detailed Description
The following will describe the technical scheme of the embodiment of the utility model clearly and completely; the utility model will be further described with reference to the accompanying drawings. As shown in fig. 1-7, in order to solve the above-mentioned drawbacks in the prior art, the present utility model discloses a thick electrode plate structure of a battery, where the thick electrode plate includes a current collector 1 and an active material layer located on the surface of the current collector 1;
wherein, the surface of the current collector 1 is provided with micro pits 10;
the active material layers are of a multi-layer structure, and a microstructure is arranged between two adjacent active material layers, wherein the microstructure refers to a convex or concave structure with the width of 1-5 mm;
the surface of the outermost active material layer is provided with a coating layer, the coating layer is composed of inorganic material particles, such as alumina particles and zirconia particles, and the inorganic material particles can prevent dendrites from growing on the surface of the pole piece and prevent the dendrites from puncturing the isolating film to bring potential safety hazards.
The width of the micro pit 10 is 10-50 micrometers, and the surface density of the micro pit 10 is 80-100 points/mm 2 The upper surface of the current collector 1 is provided with the micro pits 10; the lower surface of the current collector 1 is provided with the micro-pits 10; as shown in fig. 7, the micro-pits 10 on the upper surface of the current collector 1 are staggered from the micro-pits 10 on the lower surface of the current collector 1; the active material layers may be disposed on the upper and lower surfaces of the current collector 1, and when the current collector 1 is thin, it is preferable that the micro-pits 10 on the upper and lower surfaces of the current collector 1 are staggered, so that the micro-pits 10 on the upper and lower surfaces are prevented from pressing the cross-sectional space of the current collector 1; since the current collector 1 is further rolled after being coated with the active material, and the electrode plates expand during the cycle of the finished battery, so that a pressing force is formed on the current collector 1, all the factors may cause the current collector 1 to be broken, so that the active material on the electrode plates cannot form electrical contact, if the current collector 1 is thinner, the current collector 1 is easy to generate broken pieces or microcracks, and therefore, the micro pits 10 on the upper surface and the lower surface are preferably staggered as shown in fig. 7.
The current collector 1 is aluminum foil, the current collector 1 is a negative current collector 1, the thickness of the pole piece is larger than 1mm, and the pole piece thickness calculating method comprises the step of adding the thicknesses of active substances coated on the upper surface and the lower surface of the current collector 1 and the current collector 1 before the preparation of a positive pole piece or a negative pole piece is completed and used for manufacturing a battery cell; in one embodiment of the utility model, the thickness of the negative electrode plate comprises a negative electrode current collector 1 aluminum foil, an upper active material layer and a lower active material layer; the structure of the utility model is beneficial only when the battery consists of thick pole pieces, otherwise, the structure of the utility model is not needed when the battery is a thin pole piece, if the process complexity of the thin pole piece is increased when the battery is used, the thickness of the positive pole piece and the negative pole piece of the conventional lithium ion or sodium ion battery is 100-500um, and the binding force requirement of the pole piece, comprising the binding force between the current collector 1 and the active substance layer, can be met through a rolling procedure after one-time coating under the thickness of the pole piece of 500 um; the thickness of the positive and negative plates is 500-1000um, the positive and negative plates can be rolled by one-time coating, and in the packaging process, the positive and negative plates are tightly packaged by a packaging film or a fastener is arranged on the periphery of an electric core (a structure formed by winding or laminating the positive and negative plates and an isolating film) in the packaging film, so that the electric core is compacted; the process cannot be realized when the thickness of the electrode plate exceeds 1mm, because the electrolyte is consumed to generate SEI and other processes along with the charge and discharge of the battery, the electrode plate is thickened, and even the thickness of the electrode plate can be increased and decreased along with the charge and discharge, such as the electrode plate with charge expansion characteristics, such as a silicon anode, a tin anode, a sulfur anode and the like, when the electrode plate is charged, the thickness of the electrode plate is thickened along with the intercalation or alloying of alkali metal ions (lithium ions or sodium ions), such as the silicon material is used as an active substance to be alloyed with the lithium ions to form lithium silicon alloy, the volume expansion of the active substance exceeds 300 percent, and the volume of the active substance is reduced after lithium removal, so that the binding force between the active substance and the current collector 1 is deteriorated; the utility model improves the binding force of the current collector 1 and the active material layer by manufacturing the microstructure on the surface of the current collector 1, and improves the binding force of the pole piece by the pinning effect of the microstructure on the active material layer.
The active material layers include a first upper active material layer 210 disposed on the upper surface of the current collector 1, a second upper active material layer 220 disposed on the upper surface of the first upper active material layer 210, and a third upper active material layer 230 disposed on the upper surface of the second upper active material layer 220;
the active material layer further includes a first lower active material layer 211 disposed on the lower surface of the current collector 1, a second lower active material layer 221 disposed on the lower surface of the first lower active material layer 211, and a third lower active material layer 231 disposed on the lower surface of the second lower active material layer 221.
The outermost active material layer includes the third upper active material layer 230 and the third lower active material layer 231.
The upper surface of the first upper active material layer 210 is provided with a first upper microstructure 2101; the second upper active material layer 220 is provided with a second upper microstructure 2201 on its upper surface; the third upper active material layer 230 is provided with a third upper microstructure 2301 on its upper surface;
the lower surface of the first lower active material layer 211 is provided with a first lower microstructure 2111; the lower surface of the second lower active material layer 221 is provided with a second lower microstructure 2211; the third lower active material layer 231 is provided with a third lower microstructure 2311 on the lower surface thereof.
The third upper active material layer 230 includes a third upper active material upper surface 2302, and an upper surface coating 2303 on the third upper active material upper surface 2302; the third lower active material layer 231 includes a third lower active material lower surface 2312 and a lower surface coating 2313 on the third lower active material lower surface 2312.
The third upper layer microstructure 2301 includes a first groove 23011 and a second groove 23012 disposed to intersect.
A plurality of the first grooves 23011, and a plurality of the first grooves 23011 are arranged in parallel; the number of the second grooves 23012 is plural, and the plurality of the second grooves 23012 are arranged in parallel.
The battery is a sodium ion battery, the current collector 1 is a negative current collector 1 of the sodium ion battery, and the theoretical capacity of the sodium ion battery is lower than that of the lithium ion battery, but the theoretical price of the sodium ion battery is lower than that of the lithium ion battery, so that in order to better utilize the price advantage of the sodium ion battery, the pole piece of the sodium ion battery needs to be made thicker, thereby improving the theoretical capacity of the sodium ion battery, and the structure of the utility model is more suitable for the sodium ion battery.
In the step S1, the current collector 1 can be rolled by a roller to form micro pits 10 on the surface of the current collector 1, wherein the width of each micro pit 10 is not less than the average particle diameter of active material particles in the active material, the width of each micro pit 10 is 10-50 micrometers, and the surface density of each micro pit 10 is 80-100 points/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The roller is subjected to laser texturing treatment in advance, so that the surface of the roller is uniformly distributed with the spurs, and the tips of the spurs form a surface of the current collector 1 in the process of rolling the current collector 1Surface micro pits 10. The current collector 1 can be aluminum foil as a negative current collector 1 of a lithium ion battery, a negative current collector 1 of a sodium ion battery or a positive current collector 1 of a sodium ion battery; the current collector 1 may be a copper foil as the positive current collector 1 of a lithium ion battery. In the existing battery system, the average particle size of the negative electrode graphite particles is generally below 20um, some of the negative electrode graphite particles are below 10um, the average particle size of the positive electrode lithium iron phosphate is generally below 10um, the average particle size of the lithium cobaltate and the lithium manganate is generally below 10-20um, the evaluation particle size of the positive electrode ternary material is also generally below 20um, after the active material particles are coated on the surface of the metal current collector 1 together through a binder and dried, the binding force between the active material layer and the metal current collector 1 can be improved by the arrangement of the micro-pits 10, when the width of the micro-pits 10 is larger than the average particle size of the active material particles in the active material, more active material particles are positioned in the micro-pits 10 on the binding surface of the metal current collector 1 and the active material layer, and the binder is simultaneously present in the micro-pits 10, the binding force between the active material layer and the metal current collector 1 can be increased together, and meanwhile, the electric contact area between the active material layer and the metal current collector 1 is larger, and the multiplying power performance of the whole battery is better; if the width of the micro-pits 10 is smaller than the average particle size of the active material particles, most of the micro-pits 10 are filled with the binder and a small amount of active material particles, so that the direct binding force between the active material layer and the metal current collector 1 is relatively small, and meanwhile, the electric contact area between the active material layer and the metal current collector 1 is relatively small, and the rate capability of the whole battery is relatively reduced; however, regardless of whether the width of the micro-pits 10 is larger than the average particle diameter of the active material particles, the binding force of the active material layer to the metal current collector 1 is greater than that in the absence of the micro-pits 10, and the hardness of the spurs is greater than 850.
The utility model has the following advantages:
according to the utility model, the active material layers are arranged in the thick pole piece, and the microstructure is arranged between two adjacent active material layers, so that the binding force between the adjacent active material layers is improved, and the occurrence of powder falling is reduced;
meanwhile, the micro-pits 10 are arranged on the surface of the current collector 1, so that the binding force between the current collector 1 and an active material layer close to the current collector 1 is improved, and the occurrence of powder dropping is reduced;
the first groove 23011 and the second groove 23012 are arranged on the surface of the thick pole piece, so that the surface area of the thick pole piece is increased, the current density is reduced, and the rate capability of the battery is improved;
by arranging the coating on the surface of the active material layer of the thick pole piece, the safety performance of the thick pole piece is improved.
While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. It will be apparent to those skilled in the art that various changes may be made in this particular situation, material, composition of matter, substance, method or process without departing from the true spirit and scope of the utility model as defined by the following claims, so as to adapt the objective, spirit and scope of the utility model. All such modifications are intended to be within the scope of this appended claims.
Claims (10)
1. The thick pole piece structure of the battery is characterized by comprising a current collector and an active material layer positioned on the surface of the current collector;
wherein, the surface of the current collector is provided with micro pits;
the active material layers are of a multi-layer structure, and a microstructure is arranged between two adjacent active material layers;
the surface of the outermost active material layer is provided with a coating.
2. The thick battery pole construction of claim 1, wherein said micro-pits have a width of 10-50 microns and an areal density of 80-100 dots/mm 2 。
3. The thick pole piece structure of claim 2, wherein the current collector is aluminum foil, the current collector is a negative pole current collector, and the pole piece thickness is greater than 1mm.
4. A thick electrode battery sheet structure according to claim 3 wherein said active material layer comprises a first upper active material layer disposed on an upper surface of said current collector, a second upper active material layer disposed on an upper surface of said first upper active material layer, and a third upper active material layer disposed on an upper surface of said second upper active material layer;
the active material layer further comprises a first lower active material layer arranged on the lower surface of the current collector, a second lower active material layer arranged on the lower surface of the first lower active material layer, and a third lower active material layer arranged on the lower surface of the second lower active material layer.
5. The thick battery pole construction of claim 4, wherein said outermost active material layer comprises said third upper active material layer and said third lower active material layer.
6. The thick pole piece structure of claim 5, wherein a first upper microstructure is provided on an upper surface of said first upper active material layer; the upper surface of the second upper active material layer is provided with a second upper microstructure; the upper surface of the third upper active material layer is provided with a third upper microstructure;
the lower surface of the first lower active material layer is provided with a first lower microstructure; the lower surface of the second lower active material layer is provided with a second lower microstructure; the lower surface of the third lower active material layer is provided with a third lower microstructure.
7. The thick electrode structure of claim 6, wherein said third upper active material layer comprises a third upper active material upper surface and an upper surface coating layer on said third upper active material upper surface; the third lower active material layer comprises a third lower active material lower surface and a lower surface coating layer positioned on the third lower active material lower surface.
8. The battery thick pole construction of claim 7, wherein said third upper microstructure comprises first and second slots disposed crosswise.
9. The thick pole piece structure of claim 8, wherein a plurality of said first slots are provided and a plurality of said first slots are arranged in parallel; the second grooves are multiple, and the second grooves are arranged in parallel.
10. The thick pole piece structure of claim 9, wherein the battery is a sodium ion battery and the current collector is a negative current collector of the sodium ion battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321104215.9U CN220065737U (en) | 2023-05-10 | 2023-05-10 | Thick pole piece structure of battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321104215.9U CN220065737U (en) | 2023-05-10 | 2023-05-10 | Thick pole piece structure of battery |
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| CN220065737U true CN220065737U (en) | 2023-11-21 |
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| CN202321104215.9U Active CN220065737U (en) | 2023-05-10 | 2023-05-10 | Thick pole piece structure of battery |
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| CN (1) | CN220065737U (en) |
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