CN114023952B - Positive active material, positive plate and lithium ion battery - Google Patents

Positive active material, positive plate and lithium ion battery Download PDF

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Publication number
CN114023952B
CN114023952B CN202111287181.7A CN202111287181A CN114023952B CN 114023952 B CN114023952 B CN 114023952B CN 202111287181 A CN202111287181 A CN 202111287181A CN 114023952 B CN114023952 B CN 114023952B
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particles
positive electrode
active material
specific surface
aluminum
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CN114023952A (en
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胡典洋
彭冲
李俊义
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Zhuhai Cosmx Battery Co Ltd
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Zhuhai Cosmx Battery Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/523—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron for non-aqueous cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • 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

Abstract

The invention provides a positive electrode active material, a positive plate and a lithium ion battery, wherein the positive electrode active material is lithium cobaltate, the positive electrode active material comprises first particles and/or second particles, and the specific surface areas, the particle diameters and the aluminum doping amounts of the first particles and the second particles satisfy the following relations: the first particles had a specific surface area of 0.5m 2 /g～2m 2 (iv)/g, when Dv50 is 0.5 to 5 μm, the aluminum content of the first particles is 4500 to 9000ppm; the specific surface area of the second particles was 0.1m 2 /g～1.2m 2 And when the Dv50 is more than 5 mu m and less than or equal to 20 mu m, the aluminum doping amount of the second particles is 3000 ppm-5400 ppm. The loss caused by excessive lithium ion deintercalation can be improved through the aluminum element, and the energy density of the battery is improved and the cycle performance of the battery is improved at the same time by setting different specific surface areas according to different particles.

Description

Positive active material, positive plate and lithium ion battery
Technical Field
The invention relates to the technical field of batteries, in particular to a positive active material, a positive plate and a lithium ion battery.
Background
With the development of lithium ion secondary batteries, consumers have increasingly high demands on charging speed, endurance time, and safety performance. Meanwhile, with the advent of the 5G era, the power consumption of 5G universal equipment is increased, so that higher requirements on the cruising ability of the battery are also put forward. In order to increase higher energy in a limited volume, the voltage of the battery is increased by a commonly used means at present, but the problem of battery high-temperature performance deterioration caused by the increase of the battery voltage is solved, and meanwhile, the higher voltage also brings irreversible loss to the battery material, so that the cycle performance of the battery is influenced, and the performance attenuation of the high-voltage battery is particularly obvious under the high-temperature use condition.
Disclosure of Invention
In view of the above, the present invention provides a positive electrode active material, a positive electrode sheet and a lithium ion battery, and the present invention improves loss of the material itself by doping the positive electrode material with Al element. In addition, the present invention can achieve a balance between high temperature performance and energy density of an electrochemical device by controlling the relationship between the specific surface area of the positive electrode active material and the amount of aluminum doped.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a positive electrode active material, the positive electrode active material being lithium cobaltate, the positive electrode active material including first particles and/or second particles, specific surface areas, particle diameters, and aluminum doping amounts of the first particles and the second particles satisfying the following relationships:
the first particles had a specific surface area of 0.5m 2 /g～2m 2 The aluminum doping amount of the first particles is 4500ppm to 9000ppm when the Dv50 is 0.5 μm to 5 μm;
the specific surface area of the second particles was 0.1m 2 /g～1.2m 2 When the Dv50 is more than 5 mu m and less than or equal to 20 mu m, the aluminum doping amount of the second particles is 3000 ppm-5400 ppm.
Further, the ratio of the aluminum doping amount of the first particles to the aluminum doping amount of the second particles is 1.2 to 3.
Further, the particle size of the positive electrode active material and the aluminum doping amount satisfy the following relationship:
aluminum doping amount = k × Dv50 (-b) *1000, wherein k is 6-10, b is 0.1-0.5.
Further, k is 8.5 and b is 0.3.
Further, the specific surface area, the particle diameter and the aluminum content of the first particles and the second particles satisfy the following relationship:
the first particles had a specific surface area of 1.5m 2 /g～2m 2 (iv) the aluminum content of the first particles is 6300ppm to 9000ppm when Dv50 is 0.5 μm to 5 μm;
the specific surface area of the second particles was 0.1m 2 /g～1.2m 2 And when the Dv50 is more than 5um and less than or equal to 20um, the aluminum doping amount of the second particles is 3000 ppm-5400 ppm.
Furthermore, the mass ratio of the first particles to the second particles is 1:9-9:1.
In a second aspect, the present invention provides a positive electrode sheet comprising the positive electrode active material as described above.
Further, the positive electrode sheet includes:
and at least one side surface of the current collector is coated with a coating, and the coating contains the positive active material.
In a third aspect, the invention provides a method for preparing a positive plate, wherein the positive active material is used for preparing positive slurry, and then the positive slurry is coated on a current collector in a single-layer or multi-layer manner to obtain the positive plate.
In a fourth aspect, the invention provides a lithium ion battery comprising the positive electrode sheet as described above.
The technical scheme of the invention has the following beneficial effects:
the invention provides a positive electrode active material, which is lithium cobaltate, and comprises first particles and/or second particles, wherein the specific surface areas, the particle diameters and the aluminum-doped amounts of the first particles and the second particles satisfy the following relations: the first particles had a specific surface area of 0.5m 2 /g～2m 2 The aluminum doping amount of the first particles is 4500ppm to 9000ppm when the Dv50 is 0.5 μm to 5 μm; the specific surface area of the second particles was 0.1m 2 /g～1.2m 2 And when the Dv50 is more than 5 mu m and less than or equal to 20 mu m, the aluminum doping amount of the second particles is 3000 ppm-5400 ppm. In the electrode plate, the positive active material with smaller particle size has larger specific surface area and better performance of releasing and inserting lithium, compared with the particles with large particle size and small specific surface area, more lithium is often released on the surface of the positive active material, higher voltage is achieved, and the positive active material is irreversibly damaged. The loss due to excessive lithium ion deintercalation can be improved by the aluminum element, but the increase of the aluminum element affects the energy density of the battery. The invention researches the relationship between the specific surface area and the aluminum content of different particles through continuous exploration, so that the energy density of the battery is improved and the cycle performance of the battery is improved.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention in conjunction with the following examples, but it will be understood that the description is intended to illustrate the features and advantages of the invention further, and not to limit the invention.
In a first aspect, the present invention provides a positive electrode active material, the positive electrode active material being lithium cobaltate, the positive electrode active material including first particles and/or second particles, specific surface areas, particle diameters, and aluminum doping amounts of the first particles and the second particles satisfying the following relationships: the first particles had a specific surface area of 0.5m 2 /g～2m 2 (iv)/g, when Dv50 is 0.5 to 5 μm, the aluminum content of the first particles is 4500 to 9000ppm; the specific surface area of the second particles was 0.1m 2 /g～1.2m 2 And when the Dv50 is more than 5 mu m and less than or equal to 20 mu m, the aluminum doping amount of the second particles is 3000 ppm-5400 ppm.
In order to improve the energy density of the battery, the voltage of the battery is increased by a commonly used means at present, but the problem of battery high-temperature performance deterioration caused by the increase of the voltage of the battery is solved, and meanwhile, the higher voltage also causes irreversible loss to the battery material, so that the cycle performance of the battery is influenced, and the attenuation of the high-voltage battery performance is particularly obvious under the high-temperature use condition. The loss of the material itself caused by high voltage and high temperature can be improved by doping the anode material with Al element. In the electrode plate, the positive active material with smaller particle size has larger specific surface area and better performance of releasing and inserting lithium, compared with the particles with large particle size and small specific surface area, more lithium is often released on the surface of the positive active material, higher voltage is achieved, and the positive active material is irreversibly damaged. The loss due to excessive lithium ion deintercalation can be improved by the aluminum element, but the increase of the aluminum element affects the energy density of the battery. The invention researches the relation between the specific surface area and the aluminum content according to different particles through continuous exploration, so that the energy density of the battery is improved and the cycle performance of the battery is improved. Specifically, the positive electrode active material is divided into first particles and second particles by the specific surface area and the particle size of the particles, and the specific surface area, the particle size, and the aluminum content of the first particles and the second particles satisfy the following relationships: the first particles had a specific surface area of 0.5m 2 /g～2m 2 G, dv50 of 0.5. Mu.When the particle size is m-5 mu m, the aluminum doping amount of the first particle is 4500 ppm-9000 ppm; the specific surface area of the second particles was 0.1m 2 /g～1.2m 2 And when the Dv50 is more than 5 mu m and less than or equal to 20 mu m, the aluminum doping amount of the second particles is 3000 ppm-5400 ppm.
According to some embodiments of the invention, a ratio of the amount of aluminum doped in the first particles to the amount of aluminum doped in the second particles is 1.2 to 3. In the present invention, the amount of aluminum doped to the small particles (first particles) having a large specific surface area is larger than that to the large particles (second particles) having a small specific surface area because the first particles can remove more lithium from the surface thereof under a high voltage. In the invention, the ratio of the aluminum doping amount of the first particles to the aluminum doping amount of the second particles is 1.2-3, and the specific ratio is defined by referring to the size of the specific surface area.
According to some embodiments of the present invention, the particle diameter of the positive electrode active material and the amount of aluminum doped satisfy the following relationship: aluminum doping amount = k × Dv50 (-b) *1000, wherein k is 6-10, b is 0.1-0.5.
According to some embodiments of the invention, k has a value of 8.5 and b has a value of 0.3. The invention explores the relationship between the aluminum doping amount and the Dv50 through a large number of experiments, and finds that when the particle size of the positive electrode active material and the aluminum doping amount satisfy the following relationship: aluminum doping amount = k × Dv50 (-b) *1000, k is 8.5, b is 0.3; the aluminum doping amount is the preferred aluminum doping amount, and the aluminum doping amount can effectively improve the performance of the positive electrode active material under high voltage.
According to some embodiments of the invention, the specific surface area, the particle size and the aluminum content of the first particles and the second particles satisfy the following relationship:
the first particles had a specific surface area of 1.5m 2 /g～2m 2 The aluminum doping amount of the first particles is 6300ppm to 9000ppm when the Dv50 is 0.5 μm to 5 μm;
the specific surface area of the second particles was 0.1m 2 /g～1.2m 2 And when the Dv50 is more than 5 mu m and less than or equal to 20 mu m, the aluminum doping amount of the second particles is 3000 ppm-5400 ppm.
According to some embodiments of the invention, the mass ratio of the first particles to the second particles is 1:9 to 9:1.
In a second aspect, the present invention provides a positive electrode sheet comprising the positive electrode active material as described above.
According to some embodiments of the invention, the positive electrode sheet comprises: and at least one side surface of the current collector is coated with a coating, and the coating contains the positive active material.
In a third aspect, the invention provides a method for preparing a positive plate, wherein the positive active material is used for preparing positive slurry, and then the positive slurry is coated on a current collector in a single-layer or multi-layer manner to obtain the positive plate.
In a fourth aspect, the present invention provides a lithium ion battery comprising a positive electrode sheet as described above. In the invention, the lithium ion battery made of the positive plate can improve the energy density of the battery and simultaneously improve the cycle performance of the battery.
The invention is further illustrated by the following specific examples.
Example 1
(1) Preparing a positive plate: mixing two lithium cobaltate particles with different specific surface areas, wherein the Dv50 of the first particle is 3 μm, and the specific surface area is 1.5m 2 The aluminum doping amount is 6300ppm; the Dv50 of the second particles was 15 μm, and the specific surface area was 0.5m 2 The amount of doped aluminum is 3800ppm. Taking the first particles and the second particles according to the mass ratio of 1:4 as a positive electrode active material. According to the mass ratio of 96% of lithium cobaltate, 2.5% of conductive agent and 1.5% of binder, the positive electrode slurry is prepared by the existing batching process, the viscosity of the slurry is 2000-7000mPa.s, and the solid content is 70-80 wt.%. And (3) coating the slurry on a positive current collector after passing through a screen, wherein the coating thickness is 55 mu m, drying, and rolling and slitting to obtain the positive plate.
(2) Preparing a negative plate: the negative electrode slurry is prepared by taking artificial graphite as a negative electrode active material, and the negative electrode slurry is prepared by the existing batching process according to the mass ratio of 97.8% of artificial graphite, 1.2% of conductive agent and 2% of binder, wherein the viscosity of the slurry is 2000-5000mPa.s, and the solid content is 40-50 wt.%. And (3) coating the slurry on a negative current collector after passing through a screen, wherein the coating thickness is 130 mu m, drying, and rolling and slitting to obtain a negative plate.
(3) Preparing an electric core: and (3) rolling, die cutting and cutting the positive and negative electrode sheets obtained in the steps (1) and (2), winding to assemble a roll core, packaging with an aluminum-plastic film after a short circuit test is qualified, baking in an oven to remove moisture until the moisture reaches a moisture standard required by liquid injection, injecting electrolyte, aging for 24-48h, and completing primary charging by a hot pressing process to obtain an activated battery cell.
Example 2
(1) Preparing a positive plate: mixing two lithium cobaltate particles with different specific surface areas, wherein the Dv50 of the first particle is 1 μm, and the specific surface area is 1.85m 2 The aluminum content is 8300ppm; the Dv50 of the second particles was 10 μm, and the specific surface area was 0.8m 2 The amount of aluminum doped is 4200ppm. Taking the first particles and the second particles according to the mass ratio of 1:4 as a positive electrode active material. According to the mass ratio of 96% of lithium cobaltate, 2.5% of conductive agent and 1.5% of binder, the positive electrode slurry is prepared by the existing batching process, the viscosity of the slurry is 2000-7000mPa.s, and the solid content is 70-80 wt.%. And (3) coating the slurry on a positive current collector after passing through a screen, wherein the coating thickness is 55 mu m, drying, and rolling and slitting to obtain the positive plate.
(2): the same as (2) in example 1.
(3): the same as (3) in example 1.
Example 3
(1) Preparing a positive plate: mixing two lithium cobaltate particles with different specific surface areas, wherein the Dv50 of the first particle is 0.5 μm, and the specific surface area is 2m 2 Per gram, the aluminum doping amount is 9000ppm; the Dv50 of the second particles was 20 μm, and the specific surface area was 0.1m 2 The amount of aluminum added was 3000 ppm/g. Taking the first particles and the second particles according to the mass ratio of 1:4 as a positive electrode active material. According to the mass ratio of 96% of lithium cobaltate, 2.5% of conductive agent and 1.5% of binder, the positive electrode slurry is prepared by the existing batching process, the viscosity of the slurry is 2000-7000mPa.s, and the solid content is 70-80 wt.%. The slurry is coated on a positive electrode afflux flow after passing through a screen meshAnd coating on the body to 55 mu m, drying, and rolling and slitting to obtain the positive plate.
(2): the same as (2) in example 1.
(3): the same as in (3) in example 1.
Comparative example 1
(1) Preparing a positive plate: mixing two lithium cobaltate particles with different specific surface areas, wherein the Dv50 of the first particle is 3 mu m, and the specific surface area is 1.5m 2 The aluminum doping amount is 3800ppm; the Dv50 of the second particles was 15 μm, and the specific surface area was 0.5m 2 The amount of doped aluminum is 3800ppm. Taking the first particles and the second particles according to the mass ratio of 1:4 as a positive electrode active material. According to the mass ratio of 96% of positive active substance, 2.5% of conductive agent and 1.5% of binding agent, the positive slurry is prepared by the existing batching process, the viscosity of the slurry is 2000-7000mPa.s, and the solid content is 70-80 wt.%. And (3) coating the slurry on a positive current collector after passing through a screen, wherein the coating thickness is 55 mu m, drying, and rolling and slitting to obtain the positive plate.
(2): the same as (2) in example 1.
(3): the same as in (3) in example 1.
Comparative example 2
(1) Preparing a positive plate: mixing two lithium cobaltate particles with different specific surface areas, wherein the Dv50 of the first particle is 3 μm, and the specific surface area is 1.5m 2 The aluminum doping amount is 6300ppm; the Dv50 of the second particles was 15 μm, and the specific surface area was 0.5m 2 The amount of aluminum doped is 6300ppm. Taking the first particles and the second particles according to the mass ratio of 1:4 as a positive electrode active material. According to the mass ratio of 96% of positive active substance, 2.5% of conductive agent and 1.5% of binding agent, the positive slurry is prepared by the existing batching process, the viscosity of the slurry is 2000-7000mPa.s, and the solid content is 70-80 wt.%. And (3) coating the slurry on a positive current collector after passing through a screen mesh, wherein the coating thickness is 55 mu m, drying, and rolling and slitting to obtain a positive plate.
(2): the same as (2) in example 1.
(3): the same as in (3) in example 1.
Comparative example 3
(1) Preparing a positive plate: preparing positive electrode slurry from lithium cobaltate single particles, wherein the Dv50 of the lithium cobaltate single particles is 3 mu m, and the specific surface area is 1.5m 2 The amount of aluminum doped is 6300ppm. According to the mass ratio of 96% of positive active substance, 2.5% of conductive agent and 1.5% of binder, the positive slurry is prepared by the existing batching process, the slurry viscosity is 2000-7000mPa.s, and the solid content is 70-80 wt.%. And (3) coating the slurry on a positive current collector after passing through a screen, wherein the coating thickness is 55 mu m, drying, and rolling and slitting to obtain the positive plate.
(2): the same as (2) in example 1.
(3): the same as (3) in example 1.
Comparative example 4
(1) Preparing a positive plate: the positive electrode slurry was prepared from a single particle having a Dv50 of 15 μm and a specific surface area of 0.5m 2 The amount of doped aluminum is 3800ppm. According to the mass ratio of 96% of positive active substance, 2.5% of conductive agent and 1.5% of binding agent, the positive slurry is prepared by the existing batching process, the viscosity of the slurry is 2000-7000mPa.s, and the solid content is 70-80 wt.%. And (3) coating the slurry on a positive current collector after passing through a screen, wherein the coating thickness is 55 mu m, drying, and rolling and slitting to obtain the positive plate.
(2): the same as (2) in example 1.
(3): the same as (3) in example 1.
And (3) testing:
the cells prepared in examples 1 to 4 and comparative examples 1 to 4 were fully charged at 0.5C, discharged at 0.5C, and the energy density was the ratio of the energy E to the cell volume V.
The cells prepared in examples 1-4 and comparative examples 1-4 above were charged at a rate of 3C at 45C and discharged at a rate of 1C for a life test of 500 cycles. The test results are shown in table 1.
Table 1 performance testing of cells prepared in examples 1 to 4 and comparative examples 1 to 4
Figure BDA0003333548860000081
As can be seen from the results in table 1, example 1 prepared according to the present invention solves the high temperature cycle difference problem compared to comparative example 1 in the conventional manner; compared with a conventional mode, the energy density is improved on the premise of ensuring the high-temperature cycle retention rate in a comparative example 2. Comparative examples 3 and 4 use the particles alone compared to example 1, where comparative example 3 uses small particles with a large loss in energy density and comparative example 4 uses large particles with no guarantee of high temperature cycling performance.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A positive electrode active material, characterized in that the positive electrode active material is lithium cobaltate, the positive electrode active material includes first particles and second particles, and specific surface areas, particle diameters, and aluminum-doped amounts of the first particles and the second particles satisfy the following relationships:
the specific surface area of the first particles was 0.5m 2 /g～2m 2 (iv)/g, when Dv50 is 0.5 to 5 μm, the aluminum content of the first particles is 4500 to 9000ppm;
the specific surface area of the second particles was 0.1m 2 /g～1.2m 2 And when the Dv50 is more than 5 mu m and less than or equal to 20 mu m, the aluminum doping amount of the second particles is 3000 ppm-5400 ppm.
2. The positive electrode active material according to claim 1, wherein a ratio of the amount of aluminum doped in the first particles to the amount of aluminum doped in the second particles is 1.2 to 3.
3. The positive electrode active material according to claim 1, wherein the particle diameter and the amount of aluminum doped satisfy the following relationship:
aluminum doping amount = k × Dv50 (-b) *1000, wherein k is 6-10, b is 0.1-0.5.
4. The positive electrode active material according to claim 3, wherein k is 8.5 and b is 0.3.
5. The positive electrode active material according to claim 1, wherein the specific surface area, the particle diameter, and the aluminum content of the first particles and the second particles satisfy the following relationship:
the first particles had a specific surface area of 1.5m 2 /g～2m 2 (iv) the aluminum content of the first particles is 6300ppm to 9000ppm when Dv50 is 0.5 μm to 5 μm;
the specific surface area of the second particles was 0.1m 2 /g～1.2m 2 And when the Dv50 is more than 5 mu m and less than or equal to 20 mu m, the aluminum doping amount of the second particles is 3000 ppm-5400 ppm.
6. The positive electrode active material according to claim 1, wherein the mass ratio of the first particles to the second particles is 1:9 to 9:1.
7. A positive electrode sheet, characterized by comprising the positive electrode active material according to any one of claims 1 to 6.
8. The positive electrode sheet according to claim 7, comprising:
and at least one side surface of the current collector is coated with a coating, and the coating contains the positive active material.
9. A method for producing a positive electrode sheet, comprising preparing a positive electrode slurry from the positive electrode active material according to any one of claims 1 to 6, and coating the positive electrode slurry on a current collector in a single layer or in multiple layers to obtain the positive electrode sheet.
10. A lithium ion battery comprising the positive electrode sheet according to claim 7 or 8.
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