CN211125818U - Battery made of three-dimensional precoated pole piece - Google Patents
Battery made of three-dimensional precoated pole piece Download PDFInfo
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- CN211125818U CN211125818U CN201921443182.4U CN201921443182U CN211125818U CN 211125818 U CN211125818 U CN 211125818U CN 201921443182 U CN201921443182 U CN 201921443182U CN 211125818 U CN211125818 U CN 211125818U
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- 239000007774 positive electrode material Substances 0.000 claims abstract description 12
- 239000003792 electrolyte Substances 0.000 claims abstract description 11
- 239000007773 negative electrode material Substances 0.000 claims abstract description 9
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 238000011049 filling Methods 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 34
- 239000002041 carbon nanotube Substances 0.000 claims description 16
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 16
- 239000011148 porous material Substances 0.000 claims description 16
- 239000000835 fiber Substances 0.000 claims description 9
- 239000006230 acetylene black Substances 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 6
- 239000006229 carbon black Substances 0.000 claims 1
- 239000013543 active substance Substances 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 150000002500 ions Chemical class 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 239000006258 conductive agent Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000011888 foil Substances 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 7
- 239000011149 active material Substances 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 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
- 239000012528 membrane Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- SOXUFMZTHZXOGC-UHFFFAOYSA-N [Li].[Mn].[Co].[Ni] Chemical compound [Li].[Mn].[Co].[Ni] SOXUFMZTHZXOGC-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007600 charging Methods 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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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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- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The utility model discloses a battery made of three-dimensional precoated pole pieces, which comprises a positive pole, a negative pole, a diaphragm and a battery shell, wherein a plurality of penetrating positive micropores are arranged on a positive current collector, positive conducting layers are attached to other areas on the two sides of the positive current collector except the positive micropores, and positive active material layers are distributed on the positive conducting layers and at the positive micropores; the negative electrode is similar in structure to the positive electrode except that the negative electrode active material is different. The scheme can fully combine the advantages of precoating and micropores, improve the adhesive force of the positive and negative active substances to the base material, improve the filling amount of the positive and negative active substances, the adhesive area between the positive and negative active substances and the consistency of the internal structures of the positive and negative electrodes, and simultaneously, the components of moisture, electrolyte, conductive ions of the positive active substances and the negative active substances, and the like can more efficiently realize three-dimensional intercommunication through the micropores, thereby improving the safety, energy density, production efficiency, charge and discharge multiplying power and cycle life of the battery.
Description
Technical Field
The utility model relates to a secondary battery technical field, concretely relates to battery of pole piece is precoated by three-dimensional.
Background
With the spread of electronic devices and electric vehicles, secondary batteries are widely used. Most of the conventional secondary batteries are manufactured by coating active substances on the surface of a two-dimensional metal foil to form an electrode, in order to improve the bonding force between the metal foil and the active substances, a bonding agent needs to be added, the energy density and the cycle life of the battery are influenced, and the pore-free electrode has limited moisture drying and electrolyte diffusion consistency.
Providing through holes in a metal foil is considered to be a method for improving the electrical properties of an electrode, and as disclosed in chinese patent publication CN107871873A, by distributing micro-sized perforations on the surface of the metal foil, the bonding area between an active material and the foil can be increased, the injection efficiency of an electrolyte and the moisture drying efficiency can be improved, and the charge-discharge rate and the capacity of a battery can be improved. The method has the defect that physical defects such as cracks and splits can be generated in the mechanical perforation process, so that the improvement range of the battery performance is limited. With the increasing requirements of the market on the charge-discharge rate, the cycle life and the like of the battery, the market demand is difficult to meet by the application of a single micropore.
SUMMERY OF THE UTILITY MODEL
For solving current secondary battery's above-mentioned performance defect, the utility model provides a by the three-dimensional battery of precoating the pole piece and making, the abundant combination is precoated and micropore advantage, improves battery performance and production efficiency.
The utility model provides an embodiment that its technical problem adopted is:
a battery made of a three-dimensional pre-coated pole piece comprising:
the positive electrode comprises a positive electrode current collector, a plurality of penetrating positive electrode micropores are arranged on the positive electrode current collector, and positive electrode conducting layers are attached to the two surfaces of the positive electrode current collector except the positive electrode micropores; the positive electrode active material layer is distributed on the positive electrode conducting layers on two sides of the positive electrode current collector and in the positive electrode micropores;
the negative electrode is provided with a negative electrode current collector, the negative electrode current collector is provided with a plurality of penetrating negative electrode micropores, and negative electrode conducting layers are attached to the two surfaces of the negative electrode current collector except the negative electrode micropores; the negative electrode active material layer is distributed on the negative electrode conducting layers on two sides of the negative electrode current collector and in the negative electrode micropores;
a separator disposed at an interval between the positive electrode and the negative electrode, with a space therebetween for filling an electrolyte;
a battery case for accommodating the positive electrode, the negative electrode, the separator, and the electrolyte.
Preferably, the anodal micropore is for setting up the burr micropore to wearing on anodal mass flow body both sides, the region except anodal micropore on the anodal mass flow body both sides and attached to anodal conducting layer on the internal and external wall of anodal micropore, anodal active substance layer distributes anodal mass flow body both sides on the anodal conducting layer and in the anodal micropore.
Preferably, the aperture of the positive electrode micropores is 1-200 μm, and the pore density is 1-20000 pores/mm2The porosity is 0.1-90%, and the burr height is less than or equal to 0.1 mm.
Preferably, the negative electrode micropores are burr-free, the aperture is 1-200 mu m, and the pore density is 1-20000 pores/mm2And the porosity is 0.1-90%.
Preferably, the positive conductive layer and the negative conductive layer both include a conductive agent, and the positive conductive layer and the negative conductive layer are made of at least one of conductive carbon black, graphene, acetylene black, carbon nanotubes and carbon nanotube fibers. More preferably a mixture comprising carbon nanotube fibers and at least one of conductive carbon black, graphene, acetylene black, and carbon nanotubes.
The utility model discloses specific embodiment provides a technical scheme has following beneficial effect at least:
the positive and negative conductive layers on the surfaces of the positive and negative current collectors are used for conducting ions, so that the adhesive force of the positive and negative active substances to the base material is improved. The inner cavities of the positive and negative micropores are all used for filling positive and negative active substances, so that the filling amount of the positive and negative active substances, the bonding area between the positive and negative active substances and the internal structure consistency of the battery pole piece are improved, meanwhile, components such as water, electrolyte, conduction ions in the active substances and the like can more efficiently realize three-dimensional intercommunication through the positive and negative micropores, and the safety, the energy density, the production efficiency, the charge-discharge rate and the cycle life of the battery are improved.
Drawings
Fig. 1 is a schematic diagram of a battery structure according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a battery structure according to another embodiment of the present invention;
fig. 3 is cycle performance data for each of the examples and comparative examples.
In the figure: 100-positive electrode; 101-a positive current collector; 102-positive electrode micropores; 103-positive electrode conductive layer; 104-positive electrode active material layer; 200-negative electrode; 201-negative current collector; 202-negative electrode micropores; 203-negative conductive layer; 204-negative electrode active material layer; 300-a membrane; 400-battery case.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solution in the embodiments of the present invention, and the described embodiments are only some embodiments of the present invention, which cannot be understood as limitations to the protection scope of the present invention.
In the description of the present invention, the orientation description is referred to, and the orientation or the positional relationship indicated by, for example, up, down, front, rear, left, right, etc. is based on the orientation or the positional relationship shown in the drawings, and is only for convenience of description. In reference to a numerical description, the singular forms "a", "an", and "the" are intended to include the plural forms as well as plural forms and include plural referents, greater than, less than, greater than, or the like.
As shown in fig. 1, in the battery made of the three-dimensional precoated electrode sheet, a positive electrode 100, a separator 300, and a negative electrode 200 are sequentially provided at intervals in a battery case 400, and the gaps therebetween are used for filling an electrolyte.
The positive electrode 100 includes a positive electrode current collector 101, the positive electrode current collector 101 is provided with a plurality of penetrating positive electrode micropores 102, and positive electrode conductive layers 103 are attached to two surfaces of the positive electrode current collector 101 except the positive electrode micropores 102. In this embodiment, the positive electrode micropores 102 are disposed on the positive electrode current collector 101The positive electrode conductive layer 103 is located on both surfaces of the positive electrode collector 101 except for the positive electrode micropores 102 and on the inner and outer walls of the positive electrode micropores 102. On the positive electrode conductive layers 103 on both sides of the positive electrode current collector 101 and in the positive electrode micropores 102, positive electrode active material layers 104 are distributed. In a preferred embodiment, the pore density of the positive electrode micropores 102 is 1 to 20000 pores/mm2The porosity is 0.1-90%, the pore diameter is 1-200 mu m, and the burr height is less than or equal to 0.1 mm. In order to obtain the positive electrode 100 having the above structure, a preferable processing method is to pre-coat a conductive layer on a current collector substrate, process micropores, and finally coat a positive electrode active material. The micropore processing mode can be modes such as punching press or roll-in, can also roll the micropore after the processing, is convenient for regulate and control burr height and burr direction.
The negative electrode 200 includes a negative electrode current collector 201, and a plurality of penetrating negative electrode micropores 202 are formed on the negative electrode current collector 201, in this embodiment, the negative electrode micropores 202 are in a burr-free shape, and a negative electrode conductive layer 203 is attached to the two sides of the negative electrode current collector 201 except the negative electrode micropores 202 in other areas. On the negative electrode conductive layer 203 on both sides of the negative electrode current collector 201 and in the negative electrode micropores 202, negative electrode active material layers 204 are distributed. In a preferred embodiment, the density of the pores is 1 to 20000 pores/mm2The porosity is 0.1-90%, and the pore diameter is 1-200 μm. The negative electrode 200 having this structure can be obtained by the method for producing the positive electrode 100.
Of course, to further improve the battery performance, the negative electrode micropores 202 may also be burred micropores, as illustrated in fig. 2 and the following example 1.
In this embodiment, the shape and arrangement of the micropores are not particularly limited, and may be circular, polygonal or irregular, and the arrangement may be regular arrangement with equal distance or with non-equal distance.
The positive and negative current collectors 101 and 201 function as current collectors, and are typically metal foils. The positive electrode conductive layer 103 and the negative electrode conductive layer 203 may be formed by using a known conductive agent, with an auxiliary agent such as a binder, and may further contain a carbon-containing compound or an active material component, wherein the conductive agent includes, but is not limited to, at least one of conductive carbon black, graphene, acetylene black, carbon nanotubes, and carbon nanotube fibers, and preferably, the conductive agent is formed by adding at least one of conductive carbon black, graphene, acetylene black, carbon nanotubes, and carbon nanotube fibersA mixture of at least one of conductive carbon black, graphene, acetylene black and carbon nanotubes and carbon nanotube fibers, wherein the diameter of the carbon nanotube fibers is 2-50 nm, the length of the carbon nanotube fibers is 50-1000 mu m, the strength of the carbon nanotube fibers is 3-5 GPa, and the resistivity of the carbon nanotube fibers is 6.9 × 10-6Omega m, its electric conductivity and mechanical properties are good, the major-diameter ratio is high, do benefit to and overlap into the conductive network of high strength, further improve battery capacity and cycle life.
The existing materials which can be used as the positive active material mainly comprise lithium cobaltate, lithium manganate, lithium nickelate, lithium iron phosphate, lithium nickel cobalt manganese and the like; materials that can be used as the negative electrode active material mainly include carbon-containing compounds, silicon-containing compounds, lithium-containing compounds, tin-based negative electrode materials, or the like.
The positive electrode active material or the negative electrode active material can be mixed with a conductive agent, a binder, a solvent and the like to prepare a slurry, the slurry is coated on two sides of a positive electrode current collector 101 or a negative electrode current collector 201 with micropores and precoating layers, and then the processes of drying, rolling, stripping and the like are carried out to prepare the positive electrode 100 or the negative electrode 200. As the binder, a known material such as polytetrafluoroethylene, polyvinylidene fluoride, sodium carboxymethylcellulose, polyvinyl alcohol, polyacrylic acid, styrene-butadiene rubber, polyimide, or the like can be used, and the conductive agent used here is the same as the conductive agent used in the positive and negative electrode conductive layers, and the description thereof is omitted.
Compared with the common plane nonporous current collector, the high-density micropores and the micro burrs in the embodiment can increase the coating thickness of the active material slurry according to the density of the micropores and the burrs and the height of the burrs on the premise of ensuring the migration distance from the outermost lithium ions to the current collector, thereby improving the occupation ratio of the active material in a pole piece, and improving the energy density of a battery and the endurance time after single charging.
In practical application, according to the characteristics and granularity of different anode and cathode materials, the types, thicknesses, micropore shapes and the like of anode and cathode current collectors are reasonably selected according to comprehensive manufacturing cost, so that components such as moisture, electrolyte, conductive ions in anode active substances and cathode active substances can be more efficiently communicated in a three-dimensional mode through micropores, the safety, energy density, charge-discharge multiplying power and cycle life of a battery are improved, the electrolyte injection efficiency and moisture drying efficiency are improved, the production equipment investment and production energy consumption are reduced, and the productivity is improved.
Exemplary embodiments are as follows:
example 1
The positive electrode 100, the diaphragm 300 and the negative electrode 200 are sequentially laminated to prepare a battery core body, and the battery core body is prepared into the soft package battery through the procedures of tab welding, casing entering, sealing, baking, liquid injection, formation, degassing, capacity grading and the like.
The preparation method of the positive electrode and the negative electrode, taking the positive electrode as an example, comprises the following steps: a positive conductive layer is pre-coated on the two sides of a positive current collector, the thickness of the single side of the positive conductive layer is 1 mu m, and then the punched burr micropores are rolled, the aperture is 30-40 mu m, and the pore density is 50 per mm2The porosity is 5 percent, and the single-side burr height is 50 mu m; and then the positive active material is coated on the two sides by extrusion, and the positive electrode 100 is made after drying, rolling, slitting and die cutting. The method of preparing the negative electrode 200 is similar to that of the positive electrode 100, except that the active material is different, and the discussion is not repeated.
In the method, a positive current collector is an aluminum foil with the thickness of 12 microns, a negative current collector is a copper foil with the thickness of 8 microns, and a diaphragm 300 is a double-sided ceramic isolating membrane with the thickness of 12 microns.
The positive electrode conducting layer and the negative electrode conducting layer are CNT conducting layers with the pipe diameter of 6-10 nm and the length of 500 nm. The positive electrode active material is lithium iron phosphate, the proportion of the positive electrode active material is 90-95%, the proportion of the binder is 2-5% of PVDF, the conductive agent is compounded by conductive carbon black and conductive graphite, the proportion of the conductive carbon black and the conductive graphite is 2-5%, and the dosage of NMP is 0.6-1.5 times of that of a solid material. The negative electrode active material is graphite, the proportion of the graphite is 90-95%, the solid proportion of the binder SBR and the thickening agent CMC is 3-5%, the conducting agent is the same as the positive electrode, the proportion of the conducting agent is 2-5%, the solvent is deionized water, and the using amount of the deionized water is 1-1.5 times of that of the solid material.
Example 2
Based on example 1, except that the positive and negative electrode micropores were burr-free micropores (i.e., planar pores), and the pore diameter, pore density and porosity were the same as those of example 1.
Comparative example 1
Example 1 was used as the basis, except that the positive and negative conductive layers were not precoated.
Comparative example 2
Example 2 was used as the basis, except that the positive and negative conductive layers were not precoated.
The cycling performance of the cell was tested as follows: constant current charging and discharging, current 1C, upper limit voltage 3.65V, lower limit voltage 2.5V, and circulation for 500 times.
The test results are shown in fig. 3, and it can be seen that the solutions of the examples are more beneficial to improving the cycle performance of the battery, and the improvement range of the burr micropores is better than that of the planar micropores.
The above embodiments are for explanation of the present invention, however, the present invention is not limited to the details of the above embodiments, and various equivalent substitutions or simple modifications performed by those skilled in the art within the technical concept of the present invention should all belong to the protection scope of the present invention.
Claims (4)
1. A battery made of three-dimensional precoated pole pieces is characterized by comprising a positive pole, a negative pole, a diaphragm and a battery shell;
the positive electrode comprises a positive electrode current collector, a plurality of penetrating positive electrode micropores are arranged on the positive electrode current collector, and positive electrode conducting layers are attached to the two surfaces of the positive electrode current collector except the positive electrode micropores; the positive electrode active material layer is distributed on the positive electrode conducting layers on two sides of the positive electrode current collector and in the positive electrode micropores;
the negative electrode is provided with a negative electrode current collector, a plurality of penetrating negative electrode micropores are formed in the negative electrode current collector, and negative electrode conducting layers are attached to the two surfaces of the negative electrode current collector except the negative electrode micropores; the negative electrode active material layer is distributed on the negative electrode conducting layers on two sides of the negative electrode current collector and in the negative electrode micropores;
a separator disposed at an interval between the positive electrode and the negative electrode, with a space therebetween for filling an electrolyte;
a battery case for accommodating the positive electrode, the negative electrode, the separator, and the electrolyte.
2. The battery made of the three-dimensional pre-coated pole piece according to claim 1, wherein the positive electrode micropores are burr micropores which are arranged on both sides of the positive electrode current collector and penetrate through the two sides, a positive electrode conductive layer is attached to the areas on both sides of the positive electrode current collector except the positive electrode micropores and the inner and outer walls of the positive electrode micropores, and the positive electrode active material layer is distributed on the positive electrode conductive layer on both sides of the positive electrode current collector and in the positive electrode micropores.
3. The battery made of the three-dimensional pre-coated pole piece according to claim 2, wherein the aperture of the positive electrode micropores is 1-200 μm, and the pore density is 1-20000 pores/mm2The porosity is 0.1-90%, and the burr height is less than or equal to 0.1 mm.
4. The battery made of the three-dimensional pre-coated pole piece according to claim 1, wherein the positive electrode conducting layer and the negative electrode conducting layer are made of at least one of conducting carbon black, graphene, acetylene black, carbon nanotubes and carbon nanotube fibers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921443182.4U CN211125818U (en) | 2019-08-30 | 2019-08-30 | Battery made of three-dimensional precoated pole piece |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921443182.4U CN211125818U (en) | 2019-08-30 | 2019-08-30 | Battery made of three-dimensional precoated pole piece |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113078366A (en) * | 2021-03-29 | 2021-07-06 | 中南大学 | In-situ lithium supplement method for flexible package lithium ion battery and battery manufacturing method |
| CN113539690A (en) * | 2021-05-26 | 2021-10-22 | 中天超容科技有限公司 | Battery capacitor and preparation method thereof |
-
2019
- 2019-08-30 CN CN201921443182.4U patent/CN211125818U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113078366A (en) * | 2021-03-29 | 2021-07-06 | 中南大学 | In-situ lithium supplement method for flexible package lithium ion battery and battery manufacturing method |
| CN113078366B (en) * | 2021-03-29 | 2024-02-13 | 中南大学 | In-situ lithium supplementing and battery manufacturing method for flexible package lithium ion battery |
| CN113539690A (en) * | 2021-05-26 | 2021-10-22 | 中天超容科技有限公司 | Battery capacitor and preparation method thereof |
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