CN114335418B - Positive electrode plate and preparation method and application thereof - Google Patents
Positive electrode plate and preparation method and application thereof Download PDFInfo
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- CN114335418B CN114335418B CN202111592382.8A CN202111592382A CN114335418B CN 114335418 B CN114335418 B CN 114335418B CN 202111592382 A CN202111592382 A CN 202111592382A CN 114335418 B CN114335418 B CN 114335418B
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- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000011149 active material Substances 0.000 claims abstract description 54
- 239000010955 niobium Substances 0.000 claims abstract description 38
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 28
- 239000002002 slurry Substances 0.000 claims abstract description 28
- 239000002245 particle Substances 0.000 claims description 32
- 239000007774 positive electrode material Substances 0.000 claims description 25
- 238000001035 drying Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 11
- 239000011230 binding agent Substances 0.000 claims description 10
- 239000006258 conductive agent Substances 0.000 claims description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 9
- 229910001416 lithium ion Inorganic materials 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 5
- 229910000484 niobium oxide Inorganic materials 0.000 claims description 4
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims 2
- 239000010410 layer Substances 0.000 description 48
- 238000009826 distribution Methods 0.000 description 14
- 150000002500 ions Chemical class 0.000 description 11
- 239000011247 coating layer Substances 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 239000013543 active substance Substances 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 7
- 230000014759 maintenance of location Effects 0.000 description 5
- 238000013508 migration Methods 0.000 description 5
- 230000005012 migration Effects 0.000 description 5
- 239000002033 PVDF binder Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a positive electrode plate, a preparation method and application thereof, wherein the positive electrode plate comprises a current collector, a first active material layer and a second active material layer arranged between the current collector and the first active material layer, the first active material layer contains a niobium-based material, the positive electrode plate has a three-layer structure and comprises the current collector, an active lower layer and an active upper layer which are sequentially coated on the current collector, and the niobium-based material is added into the slurry of the active upper layer so as to further improve Li + And improves the safety of the battery. The multiplying power performance of the battery is improved by simple combination of the upper layer and the lower layer.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and relates to a positive pole piece, a preparation method and application thereof.
Background
Lithium ion batteries play an increasingly important role in the fields of new energy automobiles, energy storage and the like. Currently, in electric vehicle applications, higher demands are placed on energy density. However, the energy density of the existing power lithium ion battery is insufficient, and the endurance mileage of the electric automobile is limited. In the aspect of electrode structure, the thickness of the electrode is increased and rolling is carried out to increase the ratio of active substances, so that the energy density of the lithium ion battery can be effectively increased, but the tortuosity of the electrode is also increased, and Li + The migration path within the electrode grows and ion diffusion is limited, resulting in a significant decrease in the rate performance of the battery. Therefore, the electrode microstructure design and optimization to ensure energy density and improve battery electrical performance becomes a key to solving the above problems.
CN112510168A discloses a positive electrode plate of a lithium battery, which comprises a positive electrode current collector and a positive electrode coating layer, wherein the positive electrode current collector is provided with two opposite surfaces; the positive electrode coating layer is coated on at least one surface of the positive electrode current collector; the positive electrode coating layer comprises a first positive electrode active material coating layer and a second positive electrode active material coating layer; the first positive electrode active material coating layer is arranged between the positive electrode current collector and the second positive electrode active material coating layer; the thickness of the first positive electrode active material coating layer is 1-30 mu m; the thickness ratio of the first positive electrode active material coating layer to the second positive electrode active material coating layer is 1:5-1:50.
CN111916663a discloses a positive electrode sheet and a lithium ion battery comprising the same; the safety coating is arranged between the positive electrode active material layer and the positive electrode current collector, so that the safety performance of the battery is ensured, safety accidents are avoided, the maximum granularity D1max of the first positive electrode active material in the safety coating is selected, the thickness of the safety coating is regulated, and the loss of the lithium ion battery in the aspect of energy density is further reduced while the safety performance of the battery is ensured.
Li in the positive electrode plate according to the scheme + The migration path in the electrode is increased, ion diffusion is limited, and thus the problem of poor rate performance is caused, and therefore, an improvement in Li has been developed + And the diffusion coefficient of the cathode plate is very necessary to improve the safety performance of the battery and the multiplying power performance of the battery.
Disclosure of Invention
The invention aims to provide a positive electrode plate, a preparation method and application thereof, wherein the positive electrode plate has a three-layer structure and comprises a current collector, an active lower layer and an active upper layer which are sequentially coated on the current collector, and a niobium-based material is added into slurry of the active upper layer so as to further improve Li + And improves the safety of the battery. The multiplying power performance of the battery is improved by simple combination of the upper layer and the lower layer.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a positive electrode sheet, including a current collector, a first active material layer, and a second active material layer disposed between the current collector and the first active material layer, where the first active material layer contains a niobium-based material.
The invention prepares the pole piece with a double-layer structure by simple active upper and lower layer compounding, and canThe energy density and the multiplying power performance of the battery are effectively improved, niobium has good properties and multiple valence states, and the niobium element is applied to the electrode, so that the requirements of different batteries can be met. The addition of the active upper niobium-based material can further improve Li in the pole piece + The diffusion of ions is promoted, the ion rapid migration is promoted, the polarization degree is reduced, and the rate performance of the battery is improved; meanwhile, the structural stability of the electrode material is maintained, and the safety performance of the battery is improved.
Preferably, the niobium-based material comprises niobium oxide and/or a niobium-based composite oxide having the formula M x Nb y O z Wherein M is any one or a combination of at least two of Ti, sn, mn and W, x=1, and y is more than or equal to 0.2 and less than or equal to 48,3.6 and z is more than or equal to 125.
Preferably, the mass fraction of the niobium-based material is 0.1 to 2% based on 100% of the mass of the first active material layer, for example: 0.1%, 0.5%, 1%, 1.5% or 2%, etc.
Preferably, the thickness of the first active material layer is 40 to 160 μm, for example: 40 μm, 60 μm, 80 μm, 100 μm or 160 μm, etc.
Preferably, the thickness of the second active material layer is 100 to 200 μm, for example: 100 μm, 120 μm, 150 μm, 180 μm or 200 μm, etc.
The invention prepares the double-layer thick positive plate with different upper and lower layer porosity structures and the niobium-based material added in the upper layer. The lower layer is high in compaction, the upper layer is high in porosity, and the aim is to improve the multiplying power performance of the thick pole piece while improving the high energy density by preparing the thick pole piece. The addition of the upper niobium-based material aims to further promote Li + Diffusion, improving the rate capability of the battery and improving the safety performance of the battery.
Preferably, each of the first active material layer and the second active material layer independently includes a positive electrode active material, a conductive agent, and a binder.
Preferably, the particle diameter of the positive electrode active material in the first active material layer is in the range of 10 to 20 μm, for example: 10 to 15 μm, 12 to 18 μm, 15 to 20 μm, 10 to 18 μm or 10 to 20 μm, etc.
Preferably, the particle diameter of the positive electrode active material in the second active material layer is in the range of 3 to 30 μm, for example: 3 to 25 μm, 5 to 30 μm, 10 to 28 μm, 3 to 30 μm, 5 to 28 μm or 8 to 30 μm, etc.
The active lower layer with high compaction density is prepared by adopting active substances with wide particle size distribution, so that more conductive paths can be formed, and the electronic conductivity near the current collector end is improved; and an active upper layer with higher porosity is prepared by adopting active substances with narrow particle size distribution, so that the ion conductivity is improved. The gradient porosity structural electrode can realize improvement of electron conductivity and ion conductivity, increase energy density and improve battery electrical performance.
Preferably, the mass fraction of the positive electrode active material is 80 to 98% based on 100% of the mass of the first active material layer, for example: 80%, 85%, 90%, 95% or 98%, etc.
Preferably, the mass fraction of the binder is 1-10%, for example: 1%, 2%, 5%, 8% or 10%, etc.
Preferably, the mass fraction of the conductive agent is 1-10%, for example: 1%, 2%, 5%, 8% or 10%, etc.
Preferably, the mass fraction of the positive electrode active material is 80 to 98% based on 100% of the mass of the second active material layer, for example: 80%, 85%, 90%, 95% or 98%, etc.
Preferably, the mass fraction of the binder is 1-10%, for example: 1%, 2%, 5%, 8% or 10%, etc.
Preferably, the mass fraction of the conductive agent is 1-10%, for example: 1%, 2%, 5%, 8% or 10%, etc.
In a second aspect, the present invention provides a method for preparing the positive electrode sheet according to the first aspect, the method comprising the steps of:
(1) Mixing a first binder, a first conductive agent, a first positive electrode active material and a niobium-based material with a first solvent to obtain a first slurry, and mixing a second binder, a second conductive agent and a second positive electrode active material with a second solvent to obtain a second slurry;
(1) And coating the second slurry on the surface of the current collector, drying for the first time to obtain a second active material layer, coating the first slurry on the surface of the second active material layer, and drying for the second time to obtain the positive electrode plate.
According to the invention, the pore structure of the pole piece along the thickness direction is optimized by changing the particle size distribution of active substances of the upper active layer and the lower active layer; and adding a niobium-based material to the active upper layer slurry to further improve Li + And improves the safety of the battery. The multiplying power performance of the battery is improved by simple combination of the upper layer and the lower layer.
Preferably, the solids content of the first slurry in step (1) is 30-70%, for example: 30%, 40%, 50%, 60% or 70%, etc.
Preferably, the solids content of the second slurry is 30 to 70%, for example: 30%, 40%, 50%, 60% or 70%, etc.
Preferably, the temperature of the primary drying in the step (2) is 110-130 ℃, for example: 110 ℃, 115 ℃, 120 ℃, 125 ℃ or 130 ℃ and the like.
Preferably, the time of the primary drying is 20 to 60 seconds, for example: 20s, 30s, 40s, 50s or 60s, etc.
Preferably, the temperature of the secondary drying is 110-130 ℃, for example: 110 ℃, 115 ℃, 120 ℃, 125 ℃ or 130 ℃ and the like.
Preferably, the secondary drying time is 10-15 hours, for example: 10h, 11h, 12h, 13h, 14h or 15h, etc.
In a third aspect, the present invention provides a lithium ion battery comprising the positive electrode sheet according to the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention prepares the double-layer structure pole piece through simple active upper and lower layer compounding, can effectively improve the energy density and multiplying power performance of the battery, and the active upper layer is added with the niobium-based material, thereby being capable of further improving Li in the pole piece + Promote ion rapid migration, reduce polarization degree, and improveThe rate capability of the battery; meanwhile, the structural stability of the electrode material is maintained, and the safety performance of the battery is improved.
(2) The energy density of 0.5C of the battery prepared by the positive electrode plate can reach more than 262Wh/kg, the capacity retention rate under 3C can reach more than 85%, and the capacity retention rate under 3C can reach 95% while the energy density of 0.5C of the battery prepared by adjusting the granularity distribution of active substances and the doping amount of niobium-based materials can reach 308 Wh/kg.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Example 1
The embodiment provides a positive electrode plate, and the preparation method of the positive electrode plate comprises the following steps:
(1) Mixing NCM523 with particle size distribution of 10-20 [ mu ] m (maximum particle size of 20 [ mu ] m and minimum particle size of 10 [ mu ] m), conductive carbon black, niobium oxide and PVDF according to a mass ratio of 95:2:2:1 and NMP to obtain a first slurry with solid content of 50%, and mixing NCM523 with particle size distribution of 3-30 [ mu ] m (maximum particle size of 30 [ mu ] m and minimum particle size of 3 [ mu ] m, conductive carbon black and PVDF according to a mass ratio of 95:2:3 and NMP to obtain a second slurry with solid content of 50%;
(2) And (3) coating the second slurry on the surface of the aluminum foil, drying for 30s at 120 ℃, coating the first slurry on the surface of the second active material layer, drying for 12h at 120 ℃ to obtain a first active material layer, and rolling to obtain the positive electrode plate, wherein the thickness of the first active material layer is 80 mu m, and the thickness of the second active material layer is 150 mu m.
Example 2
The embodiment provides a positive electrode plate, and the preparation method of the positive electrode plate comprises the following steps:
(1) NCM811 with particle size distribution of 10-20 μm (maximum particle size of 20 μm and minimum particle size of 10 μm), conductive carbon black, ti 0.15 NbO 2.8 Mixing PVDF and NMP according to the mass ratio of 95:2:2:1 to obtainA first slurry with a solid content of 55%, wherein NCM811 with a particle size distribution of 3-30 [ mu ] m (the maximum particle size is 30 [ mu ] m, and the minimum particle size is 3 [ mu ] m), conductive carbon black and PVDF are mixed according to a mass ratio of 95:2:3 and NMP to obtain a second slurry with a solid content of 6%;
(2) And (3) coating the second slurry on the surface of the aluminum foil, drying for 30s at 120 ℃, coating the first slurry on the surface of the second active material layer, drying for 12h at 120 ℃ to obtain a first active material layer, and rolling to obtain the positive electrode plate, wherein the thickness of the first active material layer is 60 mu m, and the thickness of the second active material layer is 120 mu m.
Example 3
This example differs from example 1 only in that the first slurry and the second slurry are used with the same particle size of the active material, the particle size distribution is 3 to 30 μm (the maximum particle size is 30 μm and the minimum particle size is 3 μm), and the other conditions and parameters are exactly the same as in example 1.
Example 4
The present example differs from example 1 only in that the first slurry and the second slurry are used with the same particle size of the active material, the particle size distribution is 10 to 20 μm (the maximum particle size is 20 μm and the minimum particle size is 10 μm), and the other conditions and parameters are exactly the same as in example 1.
Example 5
This example differs from example 1 only in that the mass ratio of the active material to the niobium-based material in the first paste is 95.95:1, and the other conditions and parameters are exactly the same as in example 1.
Example 6
This example differs from example 1 only in that the mass ratio of the active material to the niobium-based material in the first paste is 93.8:2.2, and the other conditions and parameters are exactly the same as in example 1.
Comparative example 1
This comparative example differs from example 1 only in that no niobium-based material was added to the first paste, and other conditions and parameters were exactly the same as example 1.
Performance test:
the positive electrode sheets obtained in examples 1 to 5 and comparative example 1 were subjected to porosity, energy density and rate performance tests. And (5) carrying out pole piece porosity characterization by adopting a mercury porosimeter. The electrochemical performance test method comprises the following steps: the prepared positive electrode plate and graphite negative electrode plate are manufactured into a soft package battery according to the procedures of punching, lamination, drying, liquid injection, sealing, formation, capacity division and standing; and energy density and rate performance tests were performed at 25 ℃ and the test results are shown in table 1:
TABLE 1
As can be seen from Table 1, the positive electrode sheet of the present invention produced a battery with an energy density of 0.5C of 262Wh/kg or more and a capacity retention rate of 3C of 85% or more, and the battery produced by adjusting the particle size distribution of the active material and the doping amount of the niobium-based material had an energy density of 308Wh/kg and a capacity retention rate of 3C of 95%.
As can be seen from the comparison of examples 1 and examples 3-4, the present invention employs active materials with a broad particle size distribution to prepare an active underlayer with a high compaction density, which can form more conductive paths and increase the electron conductivity near the collector end; and an active upper layer with higher porosity is prepared by adopting active substances with narrow particle size distribution, so that the ion conductivity is improved. The gradient porosity structural electrode can realize improvement of electron conductivity and ion conductivity, increase energy density and improve battery electrical performance.
As can be seen from the comparison of the embodiment 1 and the embodiment 5-6, the doping amount of the niobium-based material in the first slurry can affect the performance of the prepared positive electrode plate, the mass fraction of the niobium-based material is controlled to be 0.1-2%, the prepared positive electrode plate has better effect, and if the doping amount of the niobium-based material is too low, the doping amount has a certain effect of improving the diffusion coefficient of lithium ions, and the rate performance of the battery is improved; with the increase of the doping amount, the rate capability is further improved, if the doping amount of the niobium-based material is too high, the distribution of each component in the pole piece can be affected, the effective utilization rate of the active substances and the niobium-based material is reduced, and the capacity retention rate at high rate is reduced, so that the rate capability is reduced.
As can be seen from the comparison of example 1 and comparative example 1, niobium has good properties and various valence states, and the present invention can meet various battery requirements by applying niobium element to an electrode. The addition of the active upper niobium-based material can further improve Li in the pole piece + The diffusion of ions is promoted, the ion rapid migration is promoted, the polarization degree is reduced, and the rate performance of the battery is improved; meanwhile, the structural stability of the electrode material is maintained, and the safety performance of the battery is improved.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.
Claims (18)
1. The positive electrode plate is characterized by comprising a current collector, a first active material layer and a second active material layer arranged between the current collector and the first active material layer, wherein the first active material layer contains a niobium-based material; each of the first active material layer and the second active material layer independently includes a positive electrode active material, a conductive agent, and a binder;
the particle diameter of the positive electrode active material in the first active material layer is in the range of 10-20 mu m;
the particle diameter of the positive electrode active material in the second active material layer is in the range of 3-30 μm;
the niobium-based material comprises niobium oxide and/or niobium-based composite oxide, and the chemical formula of the niobium-based composite oxide is M x Nb y O z Wherein M is any one or a combination of at least two of Ti, sn, mn and W, x=1, and y is more than or equal to 0.2 and less than or equal to 48,3.6 and z is more than or equal to 125.
2. The positive electrode sheet according to claim 1, wherein the mass fraction of the niobium-based material is 0.1 to 2% based on 100% of the mass of the first active material layer.
3. The positive electrode sheet according to claim 1, wherein the first active material layer has a thickness of 40 to 160 μm.
4. The positive electrode sheet according to claim 1, wherein the thickness of the second active material layer is 100 to 200 μm.
5. The positive electrode sheet according to claim 1, wherein the mass fraction of the positive electrode active material is 80 to 98% based on 100% of the mass of the first active material layer.
6. The positive electrode sheet according to claim 1, wherein the mass fraction of the binder is 1 to 10% based on 100% of the mass of the first active material layer.
7. The positive electrode sheet according to claim 1, wherein the mass fraction of the conductive agent is 1 to 10% based on 100% of the mass of the first active material layer.
8. The positive electrode sheet according to claim 1, wherein the mass fraction of the positive electrode active material is 80 to 98% based on 100% of the mass of the second active material layer.
9. The positive electrode sheet according to claim 1, wherein the mass fraction of the binder is 1 to 10% based on 100% of the mass of the second active material layer.
10. The positive electrode sheet according to claim 1, wherein the mass fraction of the conductive agent is 1 to 10% based on 100% of the mass of the second active material layer.
11. A method of producing the positive electrode sheet according to any one of claims 1 to 10, comprising the steps of:
(1) Mixing a first binder, a first conductive agent, a first positive electrode active material and a niobium-based material with a first solvent to obtain a first slurry, and mixing a second binder, a second conductive agent and a second positive electrode active material with a second solvent to obtain a second slurry;
(2) The second slurry is coated on the surface of a current collector, a second active material layer is obtained after primary drying, the first slurry is coated on the surface of the second active material layer, and the positive electrode plate is obtained after secondary drying;
the particle diameter of the positive electrode active material in the first active material layer is in the range of 10-20 mu m;
the particle diameter of the positive electrode active material in the second active material layer is in the range of 3-30 μm;
the niobium-based material comprises niobium oxide and/or niobium-based composite oxide, and the chemical formula of the niobium-based composite oxide is M x Nb y O z Wherein M is any one or a combination of at least two of Ti, sn, mn and W, x=1, and y is more than or equal to 0.2 and less than or equal to 48,3.6 and z is more than or equal to 125.
12. The method of claim 11, wherein the first slurry in step (1) has a solids content of 30 to 70%.
13. The method of claim 11, wherein the second slurry in step (1) has a solids content of 30 to 70%.
14. The method of claim 11, wherein the temperature of the primary drying in step (2) is 110 to 130 ℃.
15. The method of claim 11, wherein the one-time drying in step (2) is performed for 20 to 60 seconds.
16. The method of claim 11, wherein the secondary drying in step (2) is performed at a temperature of 110 to 130 ℃.
17. The method according to claim 11, wherein the secondary drying time in the step (2) is 10 to 15 hours.
18. A lithium ion battery comprising the positive electrode sheet according to any one of claims 1 to 10.
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| CN113517425A (en) * | 2021-04-29 | 2021-10-19 | 厦门大学 | Lithium ion battery anode material and preparation method thereof |
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