Positive electrode active material and method for manufacturing the same, positive electrode plate, battery and electrical equipment

Abstract

This application discloses a positive electrode active material, a method for manufacturing the same, a positive electrode plate, a battery, and an electric device. The positive electrode active material includes a plurality of primary particles, and the number N of equivalent sheet layers of the (003) crystal plane of the positive electrode active material (003) and the number N of equivalent sheet layers of the (104) crystal plane (104) are such that N (003) *N (104) is 1×10 4 -3×10 4 and satisfies the condition that, where D 【Equation 20】 TIFF2026521080000025.tif60170 is satisfied. Here, D (003) is the average thickness perpendicular to the direction of the (003) crystal plane in the positive electrode active material microcrystal, with the unit of nm, and d (003) is the spacing of the (003) crystal plane in the positive electrode active material microcrystal, with the unit of nm, and D (104) is the average thickness perpendicular to the direction of the (104) crystal plane in the positive electrode active material microcrystal, with the unit of nm, and d (104) is the spacing of the (104) crystal plane in the positive electrode active material microcrystal, with the unit of nm.

Description

[Technical Field]

[0001] This application belongs to the field of batteries and specifically relates to positive electrode active materials and methods for producing the same, positive electrode plates, batteries, and electrical equipment. [Background technology]

[0002] With the increasing demand in the electric vehicle market, higher demands are being placed on the energy density, rate performance, and lifespan of batteries. Battery cathode materials have long been a major focus of research in the power battery field, as they have the greatest impact on cost and performance within a power battery system. Layered nickel-cobalt-manganate lithium ternary cathode materials have a high gram capacity and are currently the mainstream choice in the power battery cathode material market. However, how to achieve both high energy density, cycle life, and safety performance in batteries supported by layered ternary cathode materials remains a question of interest in both research and application markets. [Overview of the project] [Problems that the invention aims to solve]

[0003] The purpose of this application is to solve, at least to some extent, one of the technical problems in related technologies. Therefore, one of the objectives of this application is to provide a positive electrode active material, a method for manufacturing the same, a positive electrode plate, a battery, and electrical equipment, and by employing this positive electrode active material, a battery supported thereon can achieve high energy density, cycle performance, rate performance, and safety performance simultaneously. [Means for solving the problem]

[0004] In one aspect of the present application, the present application provides a positive electrode active material. According to the embodiment of the present application, the positive electrode active material comprises a plurality of primary particles, and the number of equivalent (003) crystal plane sheets of the positive electrode active material is N (003) (104) Number of equivalent sheet layers of crystal planes N (104) is, N (003) *N (104) but,

number

[0005] The positive electrode active material according to the embodiment of the present application has the number N (003) of equivalent sheet layers of the (003) crystal plane and the number N (104) of equivalent sheet layers of the (104) crystal plane, where N (003) *N (104) satisfies the condition of being 1*10 4 -3*10 4 Thereby, the positive electrode active material has ultra-high capacity and rate performance, and in the long cycle process, the positive electrode active material microcrystal body has sufficient expansion and contraction elasticity, improving the material particle strength and charge-discharge cycle life. Thereby, by adopting the positive electrode active material of the present application, the battery carrying it can achieve high energy density, cycle performance, rate performance and safety performance simultaneously.

[0006] In addition, the positive electrode active material according to the above embodiment of the present application may have the following additional technical features.

[0007] In some embodiments of the present application, N (003) *N (104) is 1.5*10 4 -2.5*10 4 Thereby, the energy density, cycle performance, rate performance and safety performance of the battery can be further improved.

[0008] In some embodiments of the present application, the number N (003) of equivalent sheet layers of the (003) crystal plane of the positive electrode active material is 80 - 140.

[0009] In some embodiments of the present application, the number of equivalent (003) crystal plane sheets N of the positive electrode active material (003) The range is 90-130.

[0010] In some embodiments of the present application, the number of equivalent (104) crystal plane sheets of the positive electrode active material is N (104) The range is 130-200.

[0011] In some embodiments of the present application, the number of equivalent (104) crystal plane sheets of the positive electrode active material is N (104) The range is 140-190.

[0012] In some embodiments of this application,

number

[0013] In some embodiments of this application,

number

[0014] In some embodiments of the present application, the average thickness D perpendicular to the direction of the (003) crystal plane in the positive electrode active material microcrystal is (003) The range is 40nm-60nm.

[0015] In some embodiments of the present application, the average thickness D perpendicular to the direction of the (003) crystal plane in the positive electrode active material microcrystal is (003) The range is 45nm-55nm.

[0016] In some embodiments of the present application, the spacing d of the (003) crystal planes of the positive electrode active material (003)The range is 0.4730nm-0.4760nm.

[0017] In some embodiments of the present application, the spacing d of the (003) crystal planes of the positive electrode active material (003) The range is 0.4732nm-0.4750nm.

[0018] In some embodiments of this application,

number

[0019] In some embodiments of this application,

number

[0020] In some embodiments of the present application, the average thickness D perpendicular to the direction of the (104) crystal plane in the positive electrode active material microcrystal is (104) The range is 20nm-50nm.

[0021] In some embodiments of the present application, the average thickness D perpendicular to the direction of the (104) crystal plane in the positive electrode active material microcrystal is (104) The range is 30nm-40nm.

[0022] In some embodiments of the present application, the spacing d of the (104) crystal planes of the positive electrode active material (104) The range is 0.2035nm-0.2045nm.

[0023] In some embodiments of the present application, the spacing d of the (104) crystal planes of the positive electrode active material (104) The range is 0.2037nm-0.2042nm.

[0024] In some embodiments of the present application, the positive electrode active material includes a substrate, wherein the substrate is Li 1+a Ni x Co y Mn z M m The molecule contains O2, with -0.05≦a≦0.3, 0.8≦x≦1, 0≦y≦0.2, 0≦z≦0.2, and 0.002≦m≦0.01, where M contains at least one of Sb, Nb, Mg, La, Ti, Al, Sr, Ba, Y, Zr, Ca, Fe, S, Zn, and Ta. This further improves the energy density, cycle performance, rate performance, and safety performance of the battery.

[0025] In some embodiments of the present application, the positive electrode active material further comprises a coating layer formed on at least a portion of the surface of the substrate, wherein the coating layer contains element J, and element J comprises at least one of F, B, Cl, Br, I, S, Al, W, Co, Sn, and Mo. This further improves the energy density, cycle performance, rate performance, and safety performance of the battery.

[0026] In a second aspect of the present application, the present application provides a method for producing the above-mentioned positive electrode active material, the method being: A step of providing a cathode active material precursor, The process includes the step of first mixing and sintering the positive electrode active material precursor, a lithium source, and a dopant containing element M to obtain a positive electrode active material-fired material.

[0027] As a result, the positive electrode active material can be manufactured using this method, and the battery carrying it can achieve a balance of high energy density, cycle performance, rate performance, and safety performance.

[0028] In some embodiments of the present invention, the positive electrode active material precursor is produced by the following method: a mixed system containing a nickel salt, a cobalt salt, a manganese salt, a precipitant, and a complexing agent is adjusted to pH 1, and the pH 1 value is set to 9-12 to obtain a precursor crystal nucleus; the Dv50 of the precursor crystal nucleus is set to 2 μm-4 μm; the mixed system is adjusted to pH 2, and the pH 2 value is set to 9-13 to obtain a positive electrode active material precursor, where the pH 2 value is greater than the pH 1 value.

[0029] In some embodiments of this application, the difference between the pH2 value and the pH1 value is 0.1-1.

[0030] In some embodiments of the present application, the positive electrode active material precursor is The Dv50 of the positive electrode active material precursor is 9 μm-20 μm. The number of equivalent (101) crystal plane sheets of the positive electrode active material precursor N (101) The range is 60-120. The number of equivalent sheet layers (001) of the positive electrode active material precursor N (001) The range is 20-60. The number of equivalent (100) crystal plane sheets of the positive electrode active material precursor N (100) It satisfies at least one of the following conditions: the value is between 110 and 140. This makes it possible to improve the capacity and rate performance of the positive electrode active material.

[0031] In some embodiments of the present application, the positive electrode active material precursor is The number of equivalent (101) crystal plane sheets of the positive electrode active material precursor N (101) The range is 60-90. The number of equivalent sheet layers (001) of the positive electrode active material precursor N (001) The range is 20-50. The number of equivalent (100) crystal plane sheets of the positive electrode active material precursor N (100) At least one of the following conditions is met: the value is between 110 and 130. This makes it possible to improve the capacity and rate performance of the positive electrode active material.

[0032] In some embodiments of the present invention, the temperature of the first mixed sintering is 650°C-900°C, and the time is 4h-15h.

[0033] In some embodiments of the present application, the method further includes the step of forming an element J-containing coating layer on at least a portion of the surface of the positive electrode active material-fired material by second mixed sintering of the positive electrode active material-fired material and an element J-containing coating agent. This can improve the cycle stability of the positive electrode active material.

[0034] In some embodiments of the present invention, the temperature of the second mixed sintering is 200°C-700°C, and the time is 3h-10h.

[0035] In a third aspect of the present application, the present application provides a positive electrode plate comprising a positive electrode active material described in the first aspect of the present application or a positive electrode active material obtained by the method described in the second aspect of the present application. As a result, a battery supported thereon can achieve high energy density, cycle performance, rate performance, and safety performance simultaneously.

[0036] In a fourth aspect of the present application, the present application provides a battery comprising the positive electrode plate described in the third aspect of the present application, thereby achieving a balance of high energy density, cycle performance, rate performance, and safety performance.

[0037] In a fifth aspect of the present application, the present application provides an electrical device including a battery as described in the fourth aspect of the present application.

[0038] Additional aspects and advantages of the present invention are shown in part in the following description, some of which become apparent from the following description, or are understood through the practice of the present invention. [Modes for carrying out the invention]

[0039] The embodiments of the present application will be described in detail below, with examples relating to the embodiments shown in the drawings. Throughout, the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and intended to illustrate the present application, and should not be construed as limiting the present application.

[0040] The endpoints and any values ​​of the ranges disclosed herein should be understood to include values ​​close to such exact ranges or values, and not to be limited to such exact ranges or values. In the case of numerical ranges, the intervals between the endpoint values ​​of each range, between the endpoint values ​​of each range and individual point values, and between individual point values ​​combine to obtain one or more new numerical ranges, and these numerical ranges shall be deemed to be specifically disclosed in the specification.

[0041] In one aspect of the present application, the present application proposes a positive electrode active material. According to an embodiment of the present application, the positive electrode active material comprises a plurality of primary particles, and the number of equivalent (003) crystal plane sheets of the positive electrode active material is N (003) (104) Number of equivalent sheet layers of crystal planes N (104) is, N (003) *N (104) is 1*10 4 -3*10 4 And,

number

[0042] The inventors have found that the number of equivalent crystal plane sheets in a layered cathode active material represents the size of the R-3m structure. In the case of a layered cathode active material, the statistical number of layers in a certain direction can reflect the average number of lattice sites in that direction. For a layered cathode active material, the number of equivalent crystal plane sheets in each direction can truly reflect the number of active lithium sites that a single microcrystal can accommodate, which affects capacity, lithium ion transport pathways, and overall structural stability. (003) Number of equivalent crystal plane sheets N of the cathode active material (003 ) and (104) Equivalent number of crystal planes N (104) The product of (N (003) *N (104) ) reflects the product of the number of equivalent crystal plane sheet layers in the c-axis and a-axis directions of the crystal cell, representing the degree of stacking of the layered frame of the entire microcrystal, determining the number of lithium parts that the entire positive electrode active material can accommodate from a structural-performance perspective, affecting not only the total capacity of the material but also the stability of the crystal. The inventors further determined the (003) number of equivalent crystal plane sheet layers N of the positive electrode active material. (003) (104) Number of equivalent sheet layers of crystal planes N (104) is, N (003) *N (104) is 1*10 4 -3*10 4 By satisfying the following conditions, the positive electrode active material can have ultra-high capacity and rate performance, and during long cycle processes, the microcrystalline body of the positive electrode active material has sufficient expansion and contraction elasticity, improving material particle strength and charge / discharge cycle life. As a result, by adopting the positive electrode active material of this invention, batteries supporting it can achieve a balance of high energy density, cycle performance, rate performance, and safety performance.

[0043] According to the embodiment of the present application, the number of equivalent (003) crystal plane sheets N of the positive electrode active material (003 ) and (104) Equivalent number of crystal planes N (104) is, N (003) *N (104) is 1*10 4 -3*10 4 For example, 1*10 4 , 1.5*10 4 , 2*104 , 2.5*10 4 , 3*10 4 The following conditions are met, and according to the specific embodiment of this application, N (003) *N (104) is 1.5*10 4 -2.5*10 4 This allows for further improvements in the battery's energy density, cycle performance, rate performance, and safety performance.

[0044] According to the embodiment of the present application, the number of equivalent (003) crystal plane sheets of the positive electrode active material is N (003) The number of equivalent sheet layers N of the (003) crystal plane of the positive electrode active material is 80-140, for example, 80, 90, 100, 110, 120, 130, 140, and furthermore, the number of equivalent sheet layers N of the (003) crystal plane of the positive electrode active material. (003) The number of equivalent (104) crystal plane sheets of the positive electrode active material is N. (104) The number of (104) crystal plane equivalent sheet layers of the positive electrode active material is 130-200, for example, 130, 140, 150, 160, 170, 180, 190, 200, etc. Furthermore, the number of (104) crystal plane equivalent sheet layers of the positive electrode active material is 140-190.

[0045] The inventors have found that when the number of equivalent sheet layers of the (003) crystal plane of the positive electrode active material is within the above range, there are sufficient lithium sites in the overall layered frame, providing space to accommodate the active lithium and allowing for the maximum reversible gram capacity to be obtained. At the same time, it exhibits a stabilizing effect against expansion and contraction of the c axis during the charge-discharge process, mitigating distortion and collapse of the material structure and conferring excellent cycle stability to the material. The number of equivalent sheet layers of the (104) crystal plane of the positive electrode active material can indirectly reflect the number of layers in the a-axis direction, represent the size of the planar layers, determine the number of lithium ion sites that can be accommodated in each planar layer, and determine the length of the solid phase transfer path when lithium ions are absorbed and released within the layer. When the number of equivalent sheet layers of the (104) crystal plane of the positive electrode active material is within the above range, the material can be given maximum reversible capacity and high rate performance. Thus, the present invention relates to the N of the positive electrode active material. (003) and N (104)By controlling it within the above range, the battery's energy density, cycle performance, rate performance, and safety performance can be further improved.

[0046] Specifically, by calculating the XRD measurement results of the positive electrode active material using the Scherrer and Bragg formulas, the average microcrystalline thickness D along a certain crystal plane of the material can be determined. hkl and the spacing d between crystal planes along a crystal plane in the material. hkl We can find N hkl =D hkl / d hkl Then, the number of equivalent crystal sheet layers along a specific crystal plane in the material is calculated, for example,

number

[0047] For example, the above

number

number

number

number

[0048] According to the embodiment of the present application, the average thickness D perpendicular to the direction of the (003) crystal plane in the positive electrode active material microcrystal (003) is 40 nm - 60 nm, for example, 40 nm, 45 nm, 50 nm, 55 nm, 60 nm, etc., and further, the average thickness D perpendicular to the direction of the (003) crystal plane in the positive electrode active material microcrystal (003) is 45 nm - 55 nm. Thereby, by satisfying that the average thickness D perpendicular to the direction of the (003) crystal plane in the positive electrode active material microcrystal (003) is within the above range, the material has an appropriate microcrystal size in the c-axis direction, not only ensures the release of normal reversible capacity, but also has a certain stabilizing effect when expansion and contraction occur in the c-axis, and can give the material excellent comprehensive performance in terms of capacity and cycle.

[0049] According to the embodiment of the present application, the interplanar spacing d of the (003) crystal plane of the positive electrode active material (003) is 0.4730 nm - 0.4760 nm, for example, 0.4730 nm, 0.4735 nm, 0.4740 nm, 0.4745 nm, 0.4750 nm, 0.4755 nm, 0.4760 nm, etc., and further, the interplanar spacing d of the (003) crystal plane of the positive electrode active material (003) is 0.4732 nm - 0.4750 nm. Thereby, by satisfying that the interplanar spacing d of the (003) crystal plane of the positive electrode active material (003) is within the above range, it is advantageous for the rapid intercalation and deintercalation of lithium ions, improves the rate performance of the material, provides a certain space for the contraction and expansion of the crystal cell in the c-axis direction, reduces the lattice strain and the micro stress of the microcrystal, and improves the material stability.

[0050] According to the embodiment of the present application, the average thickness D perpendicular to the direction of the (104) crystal plane in the positive electrode active material microcrystal (104)is 20 nm - 50 nm, for example, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, etc., and further, the average thickness D perpendicular to the direction of the (104) crystal plane in the positive electrode active material microcrystal (104) is 30 nm - 40 nm. Thereby, the average thickness D perpendicular to the direction of the (104) crystal plane in the positive electrode active material microcrystal (104) satisfies the above range, so that the material has an appropriate microcrystal size in the a-axis direction, the material has an active structure and a lithium ion migration path of an appropriate size, and it is ensured that the material has high capacity and good rate performance.

[0051] According to an embodiment of the present application, the spacing d of the (104) crystal plane of the positive electrode active material (104) is 0.2035 nm - 0.2045 nm, for example, 0.2035 nm, 0.2037 nm, 0.2039 nm, 0.2040 nm, 0.2042 nm, 0.2044 nm, 0.2045 nm, etc., and further, the spacing d of the (104) crystal plane of the positive electrode active material (104) is 0.2037 nm - 0.2042 nm. Thereby, the spacing d of the (104) crystal plane in the positive electrode active material (104) satisfies the above range, which is not only advantageous for the rapid intercalation and deintercalation of lithium ions, but also relaxes the shrinkage of the crystal cell in the a-axis direction, and can improve the rate performance and cycle stability of the material.

[0052] According to an embodiment of the present application, the positive electrode active material includes a matrix, and the matrix is Li 1+a Ni x Co y Mn z M m O2, where -0.05 ≤ a ≤ 0.3, 0.8 ≤ x ≤ 1, 0 ≤ y ≤ 0.2, 0 ≤ z ≤ 0.2, 0.002 ≤ m ≤ 0.01, and M includes at least one of Sb, Nb, Mg, La, Ti, Al, Sr, Ba, Y, Zr, Ca, Fe, S, Zn, and Ta. Thereby, the energy density, cycle performance, rate performance, and safety performance of the battery can be further improved.

[0053] According to some embodiments of the present application, the Li1+a Ni x Co y Mn z M m In O2, a1 satisfies -0.05 ≤ a ≤ 0.3, for example a can be -0.05, -0.02, 0, 0.02, 0.05, 0.1, 0.2, 0.3, etc. This ensures that the substrate contains lithium ions of this content, improving the specific capacity of the positive electrode active material, thereby giving the battery a high energy density.

[0054] According to some embodiments of the present application, the Li 1+a Ni x Co y Mn z M m In O2, x, y, z, and m satisfy 0.8 ≤ x ≤ 1, 0 ≤ y ≤ 0.2, 0 ≤ z ≤ 0.2, and 0.002 ≤ m ≤ 0.01. For example, x can be 0.8, 0.85, 0.9, 0.95, 1, etc., y can be 0, 0.1, 0.15, 0.2, etc., z can be 0, 0.1, 0.15, 0.2, etc., and m can be 0.002, 0.005, 0.007, 0.01, etc.

[0055] According to embodiments of the present application, the positive electrode active material further includes a coating layer formed on at least a portion of the surface of the substrate, the coating layer containing element J, and the element J includes at least one of F, B, Cl, Br, I, S, Al, W, Co, Sn, and Mo. By forming a coating layer containing element J on the substrate, the energy density, cycle performance, rate performance, and safety performance of the battery can be further improved simultaneously.

[0056] Furthermore, the form in which element J exists in the above coating layer may include oxides and / or lithium oxides, and those skilled in the art can select them as needed, which will not be explained again here.

[0057] In a second aspect of the present application, the present application proposes a method for producing the above-mentioned positive electrode active material. According to an embodiment of the present application, the method includes the following steps: S100: Provides a cathode active material precursor.

[0058] According to the embodiments of the present application, the positive electrode active material precursor may be a commercially available product or manufactured by the following steps: Sa: A mixed system containing nickel salt, cobalt salt, manganese salt, precipitant, and complexing agent is adjusted to pH 1, and then to a pH of 9-12 to obtain precursor crystal nuclei. Specifically, nickel salt solution, cobalt salt solution, and manganese salt solution are mixed in the molar ratios x:y:z of nickel, cobalt, and manganese elements to obtain a mixed salt solution. Then, nitrogen gas is introduced into the reaction vessel, and at the same time, the salt solution, precipitant (e.g., sodium hydroxide solution), and complexing agent (e.g., aqueous ammonia) are mixed into the reaction vessel, and the pH of the mixed system is adjusted to a pH of 9-12. The mixture is allowed to react sufficiently to co-precipitate and form precursor crystal nuclei. Sb: When the Dv50 of the precursor crystal nucleus is 2μm-4μm, the mixed system is adjusted to pH 2, and the pH 2 value is set to 9-13. Mixed salt solution, precipitant, and complexing agent are continuously added so that nickel ions, cobalt ions, and manganese ions in the mixed salt solution continue the coprecipitation reaction using the precursor crystal nucleus as a seed crystal, thereby obtaining a positive electrode active material precursor, where the pH 2 value is greater than the pH 1 value. For example, the difference between the pH 2 value and the pH 1 value is 0.1-1.

[0059] The method for producing the positive electrode active material precursor of this invention is simple and feasible, and by controlling the pH value, a precursor having a specific number of crystal plane equivalent sheet layers can be synthesized, and furthermore, the microcrystalline structure in the primary particles of the positive electrode active material can be influenced.

[0060] According to the embodiments of the present application, the Dv50 of the positive electrode active material precursor is 9 μm-20 μm, for example, 9 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, etc.

[0061] In this application, Dv50 refers to the particle size corresponding to the point when the cumulative volume distribution ratio reaches 50%, and is measured using a laser particle size analyzer (e.g., Malvern Master Size 3000) with reference to the standard GB / T 19077-2016.

[0062] According to the embodiment of the present application, the number of (101) equivalent sheet layers of the positive electrode active material precursor is N (101) The number of equivalent (101) crystal plane sheets N of the positive electrode active material precursor is 60-120, for example, 60, 70, 80, 90, 100, 110, 120, etc. (101) The number of equivalent sheet layers of the (001) crystal plane of the positive electrode active material precursor is N. (001) The number of equivalent sheet layers of the (001) crystal plane of the positive electrode active material precursor is N. (001) The number of equivalent sheet layers of the (100) crystal plane of the positive electrode active material precursor is N. (100) The number of equivalent crystal plane sheets N of the positive electrode active material precursor is 110-140, for example, 110, 120, 130, 140, etc. (100) The range is 110-130.

[0063] As a result, the number of equivalent (101) crystal plane sheets N of the positive electrode active material precursor (101) (001) Number of equivalent sheet layers N (001) (100) Equivalent number of crystal planes and sheet layers N (100) By satisfying the above range, the precursor has a wide fission temperature tolerance range, and even when the sintering temperature is increased, the positive electrode active material is sufficiently lithiumed, resulting in high crystallinity and few crystal defects. At the same time, because the precursor can withstand high temperatures, it prevents the positive electrode crystal from growing continuously and the number of equivalent crystal plane sheets from becoming excessive. As a result, a precursor that satisfies the above number of equivalent crystal plane sheets can simplify the fission process, and consequently, the capacity and rate performance of the manufactured positive electrode active material can be improved.

[0064] Note that the number of equivalent (101) crystal plane sheets of the positive electrode active material precursor is N. (101) (001) Number of equivalent sheet layers N (001) and (100) equivalent number of crystal planes sheet layers N (100) The measurement of the N of the positive electrode active material is performed as described above. (003) and N (104) Similar to measurement, for example

number

[0065] For example, the above

number

number

number

number

number

number

[0066] S200: A dopant containing a positive electrode active material precursor, a lithium source, and element M is subjected to a first mixed sintering process.

[0067] According to the embodiment of the present application, the cathode active material precursor obtained in the above step, a lithium source, and a dopant containing element M are subjected to a first mixed sintering in an oxygen-containing atmosphere, where the temperature of the first mixed sintering is 650°C-900°C, for example the sintering temperatures are 650°C, 680°C, 700°C, 720°C, 750°C, 780°C, 800°C, 820°C, 850°C, 880°C, and 900°C, and the time is 4h-15h, for example 4h, 6h, 8h, 10h, 12h, 15h, etc. Next, the sintered compound is allowed to cool to room temperature by natural temperature reduction, then crushed, sieved, and iron removed to obtain the cathode active material-fired material. By selecting a specific doping element M, the growth of microcrystals of the cathode active material in the lithification stage can be controlled, and by combining the above sintering conditions, it is possible to control the number of equivalent crystal plane sheets and the spacing of crystal planes of the cathode active material.

[0068] For example, the nickel salt, cobalt salt, and manganese salt mentioned above may be chlorides, carbonates, and sulfates corresponding to each element, and the lithium source and the dopant containing element M may be at least one of the corresponding chlorides, carbonates, sulfates, and oxides.

[0069] As a result, the positive electrode active material can be manufactured and obtained by this method, and a battery carrying it can achieve high energy density, cycle performance, rate performance, and safety performance simultaneously.

[0070] According to the embodiments of the present application, the method for producing the above-mentioned cathode active material further includes the following steps.

[0071] S300: The positive electrode active material-fired material and the element J-containing coating obtained in step S200 are subjected to a second mixed sintering in an oxygen-containing atmosphere. The temperature of the second mixed sintering is 200°C-700°C, for example, 200°C, 300°C, 400°C, 500°C, 600°C, 700°C, etc., and the time is 3h-10h, for example, 3h, 4h, 5h, 6h, 7h, 8h, 9h, 10h, etc., so that an element J-containing coating layer is formed on at least a portion of the positive electrode active material-fired material surface. Then, the temperature is naturally lowered, and after crushing, sieving, and iron removal, the positive electrode active material is obtained. By forming an element J-containing coating layer on the outer surface of the positive electrode active material, side reactions between the inner core of the positive electrode active material and the electrolyte are reduced, thereby improving the cycle stability of the positive electrode active material.

[0072] Furthermore, the characteristics and advantages described above for the positive electrode active material also apply to the method for manufacturing the positive electrode active material, and will not be repeated here.

[0073] In a third aspect of the present application, the present application proposes a positive electrode plate. According to an embodiment of the present application, the positive electrode plate comprises a positive electrode active material described in the first aspect of the present application or a positive electrode active material obtained by the method described in the second aspect of the present application.

[0074] According to embodiments of the present application, the positive electrode plate includes a positive electrode current collector and a positive electrode active material layer provided on the positive electrode current collector, the positive electrode active material layer includes the positive electrode active material, and the positive electrode current collector may be a metal foil sheet or a composite current collector (a composite current collector may be formed by providing a metal material on a polymer substrate), for example, an aluminum foil may be used for the positive electrode current collector.

[0075] According to some embodiments of the present application, the positive electrode active material layer may optionally contain a binder. For example, the binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, or fluorine-containing acrylic ester resin.

[0076] According to some embodiments of the present application, the cathode active material layer may optionally contain a conductive agent. For example, the conductive agent may include at least one of superconducting carbon, acetylene black, carbon black, Kocheng black, carbon dots, carbon nanotubes, graphene, or carbon nanofibers.

[0077] According to some embodiments of the present application, a positive electrode plate can be manufactured by the following method: components for manufacturing the positive electrode plate, such as a positive electrode active material, a conductive agent, a binder, and any other components, are dispersed in a solvent (e.g., N-methylpyrrolidone) to form a positive electrode slurry; the positive electrode slurry is applied to a positive electrode current collector; and after processes such as drying and cold pressing, a positive electrode plate can be obtained.

[0078] The features and advantages described above for the positive electrode active material and its manufacturing method also apply to the positive electrode plate and will not be repeated here.

[0079] In a fourth aspect of the present application, the present application proposes a battery. According to an embodiment of the present application, the battery includes the positive electrode plate described above.

[0080] For example, a battery includes a positive electrode plate, a negative electrode plate, an electrolyte, and a separator, with the separator located between the positive and negative electrode plates. During the charging and discharging process of the battery, active ions are intercepted and deintercepted as they travel back and forth between the positive and negative electrode plates. The electrolyte plays the role of conducting ions between the positive and negative electrode plates. The separator is provided between the positive and negative electrode plates and primarily serves to prevent short circuits between the positive and negative electrodes while also allowing ions to pass through.

[0081] According to embodiments of the present application, the negative electrode plate includes a negative electrode current collector and a negative electrode active material layer provided on the negative electrode current collector, the negative electrode active material layer includes a negative electrode active material, the negative electrode current collector may be a metal foil sheet or a composite current collector (a composite current collector may be formed by providing a metal material on a polymer substrate), and for example, copper foil may be used for the positive electrode current collector.

[0082] According to some embodiments of the present application, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc.

[0083] According to some embodiments of the present application, the negative electrode active material layer may optionally contain a conductive agent. The conductive agent may include at least one of superconducting carbon, acetylene black, carbon black, Kocheng black, carbon dots, carbon nanotubes, graphene, or carbon nanofibers.

[0084] According to some embodiments of the present application, the negative electrode active material layer may optionally contain other auxiliary agents, such as thickeners (e.g., sodium methylcellulose (CMC-Na)).

[0085] According to some embodiments of the present invention, a negative electrode plate can be manufactured by the following method: components for manufacturing the negative electrode plate, such as a negative electrode active material, a conductive agent, and an adhesive, are dispersed in a solvent (e.g., a deionized solvent) to form a negative electrode slurry; the negative electrode slurry is applied to a negative electrode current collector; and after processes such as drying and cold pressing, a negative electrode plate can be obtained.

[0086] According to some further embodiments of the present application, the negative electrode plate may include a metallic lithium piece or a lithium alloy, such as a lithium indium alloy.

[0087] According to several embodiments of the present application, the type of separator is not particularly limited, and any known porous structure separator with excellent chemical and mechanical stability can be arbitrarily selected. For example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, or polyvinylidene fluoride. The separator may be a single-layer film or a multilayer composite film, and is not particularly limited. If the separator is a multilayer composite film, the materials of each layer may be the same or different, and are not particularly limited.

[0088] According to some embodiments of the present application, the type of electrolyte is not specifically limited and can be selected as needed. For example, the electrolyte may be liquid, gel, or all-solid. According to some specific embodiments of the present application, the electrolyte is an electrolyte solution containing a lithium salt and a solvent.

[0089] According to some specific embodiments of the present application, the lithium salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bistrifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorodisoxalate borate, lithium disoxalate borate, lithium difluorodisoxalate phosphate, or lithium tetrafluorooxalate phosphate.

[0090] According to some specific examples of the present application, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, propylene carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl propionate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, ethylene glycol dimethyl ether, methyl ethyl sulfone, or diethoxysulfone.

[0091] In some embodiments of the present invention, the electrolyte may optionally contain additives. For example, the additives may include additives for negative electrode film formation, additives for positive electrode film formation, and may also include additives that can improve certain performance characteristics of the battery, such as additives that improve the overcharge performance of the battery, or additives that improve the high-temperature or low-temperature performance of the battery.

[0092] The features and advantages described above for the positive electrode plate also apply to this solid-state battery and will not be repeated here.

[0093] In a fifth aspect of the present application, the present application proposes an electrical device. According to an embodiment of the present application, the electrical device includes the above-mentioned battery. According to an embodiment of the present application, the electrical device may include, but is not limited to, a mobile phone, a laptop computer, an electric vehicle, and the like.

[0094] The features and advantages described above for the battery also apply to the electrical equipment in question and will not be repeated here.

[0095] Examples of the present application are described below. The examples described below are illustrative and are used solely to illustrate the present application and should not be considered limiting. Where the examples do not specify any particular technique or conditions, they should be carried out in accordance with the technique or conditions described in the art literature or in accordance with the product specification. Where the manufacturer of the reagents or equipment used is not indicated, they are conventional products available on the market.

[0096] • Example 1 (1) Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate in pure water in a molar ratio of nickel, cobalt, and manganese of 84:10:6 to obtain a mixed salt solution with a concentration of 2 mol / L. Prepare a sodium hydroxide solution with a concentration of 8 mol / L as a precipitating agent solution, and prepare ammonia water with a concentration of 6 mol / L as a complexing agent solution. Add the sodium hydroxide and ammonia water solution to the reaction vessel, adjust the pH to 10.9, protect by introducing nitrogen gas, control the temperature of the reaction system to 60°C, and supply the mixed salt solution, sodium hydroxide solution, and ammonia water from the respective liquid supply pipes. After adding the mixture to the reaction vessel, the stirring speed was maintained at 500 rpm, the supply rate of the mixed salt solution was controlled to 200 mL / h, the flow rates of the sodium hydroxide solution and ammonia water were adjusted, and the pH of the reaction system was maintained at 10.9 ± 0.05. After the Dv50 of the precursor crystal nuclei in the reaction system grew to 3.0 μm, the pH of the solution was adjusted to 11.3 ± 0.05, the flow rate of the mixed salt solution was adjusted to 500 mL / h, the stirring speed was increased to 700 rpm, the reaction temperature remained unchanged, and after the average particle size Dv50 in the solution grew to 14 μm, it was aged for 1 hour, separated, washed, and dried to obtain the precursor of the positive electrode active material. (2) The above precursor, lithium hydroxide, and niobium pentoxide are weighed according to the sum of nickel-cobalt-manganese elements in the precursor and the molar ratio of lithium to niobium elements of 1:1.03:0.007, then uniformly mixed in a mixer, and sintered at a constant temperature in an oxygen furnace, where the oxygen concentration in the oxygen-containing gas in the oxygen furnace is greater than 95% by volume, the heating rate is 5°C / min, the sintering temperature is 810°C, and the sintering time is 10h, and after natural cooling to room temperature, the material is crushed, sieved, and iron is removed to obtain the positive electrode active material - calcined material. (3) The positive electrode active material - calcined material and boric acid are uniformly mixed in a high-speed mixer with a molar ratio of 1:0.001 between the sum of transition metal elements in the positive electrode active material - calcined material and boron. The mixture is then sintered at a constant temperature of 350°C in an oxygen furnace, with the oxygen concentration in the oxygen-containing gas in the oxygen furnace being greater than 90% by volume, and the sintering time being 10 hours. After cooling, sieving, and iron removal, the positive electrode active material Li 1.03 Ni 0.813 Co 0.100 Mn 0.060 Nb 0.004 P 0.003 O2@B is obtained, and in the chemical formula of the positive electrode active material, the part before @ is the substrate component, and the part after @ is the main element in the coating layer.

[0097] Examples 2-8 and Comparative Examples 1-7 The positive electrode active material was manufactured according to the method of Example 1, and the material composition and specific process conditions are shown in Table 1.

[0098] In Example 2, magnesium oxide was used as the dopant and boric acid was used as the coating agent.

[0099] In Example 3, ditantalum pentoxide was used as the dopant, and boric acid was used as the coating agent.

[0100] In Example 4, magnesium oxide was used as the dopant and tungsten trioxide was used as the coating agent.

[0101] In Example 5, molybdenum oxide was used as the dopant and tungsten trioxide was used as the coating agent.

[0102] In Example 6, diniobium pentoxide and diantimony trioxide were used as the dopant, and boric acid was used as the coating agent.

[0103] In Example 7, strontium oxide and antimony trioxide were used as the dopant, and boric acid was used as the coating agent.

[0104] In Example 8, niobium pentoxide was used as the dopant, and no coating agent was used.

[0105] In Comparative Example 1, aluminum trioxide and niobium pentoxide were used as the dopant, and boric acid was used as the coating agent.

[0106] In Comparative Example 2, diniobium pentoxide was used as the dopant, and boric acid was used as the coating agent.

[0107] In Comparative Example 3, diniobium pentoxide and ammonium dihydrogen phosphate were used as the dopant, and boric acid was used as the coating agent.

[0108] In Comparative Example 4, no dopant was used, and boric acid was used as the coating agent.

[0109] In Comparative Example 5, antimony trioxide was used as the dopant, and boric acid was used as the coating agent.

[0110] In Comparative Example 6, diniobium pentoxide was used as the dopant and boric acid was used as the coating agent.

[0111] In Comparative Example 7, diniobium pentoxide was used as the dopant, and boric acid was used as the coating agent.

[0112] [Table 1]

[0113] Note: In Table 1, in Example 6, when the doping elements include Nb and Sb, the precursor, lithium source, and dopant are in the molar ratio of (Ni+Co+Mn), lithium, and M. This should be understood as the molar ratio of (Ni+Co+Mn), lithium, Nb, and Sb. The other examples are the same as the comparative examples.

[0114] Table 2 shows the number of equivalent crystal plane sheets and the composition of the positive electrode active material obtained in Example 2-8 and Comparative Example 1-7.

[0115] [Table 2]

[0116] The average thickness D perpendicular to the direction of the (003) crystal plane in the positive electrode active material microcrystals obtained in Examples 2-8 and Comparative Examples 1-7 (003) , the spacing d between crystal planes (003) in the positive electrode active material microcrystals (003) , the average thickness D perpendicular to the direction of the (10⁴) crystal plane in the positive electrode active material microcrystal. (104) , the spacing d between crystal planes (104) in the positive electrode active material microcrystals (104) Number of equivalent sheet layers of the crystal plane of the positive electrode active material N (003) , the number of equivalent sheet layers of the (10⁴) crystal plane of the positive electrode active material N (104) and N (003) *N (104) This is shown in Table 3.

[0117] [Table 3]

[0118] The positive electrode active materials obtained in Examples 1-8 and Comparative Examples 1-7 were assembled into 2025 type button batteries, and the initial Coulomb efficiency, cycle performance, rate performance, and lithium-ion diffusion coefficient of the batteries were characterized. The characterization results are shown in Table 4.

[0119] The manufacturing process for the 2025 type button cell battery is as follows: Positive electrode plate manufacturing: The positive electrode active material, acetylene black, and polyvinylidene fluoride (PVDF) are thoroughly mixed with an appropriate amount of N-methylpyrrolidone (NMP) in a mass ratio of 95:3:2 to form a uniform slurry. The slurry is applied to both surfaces of aluminum foil and dried at 120°C for 12 hours. After that, it is press-molded at a pressure of 100 MPa to produce a positive electrode plate with a diameter of 12 mm and a thickness of 120 μm. Here, the loading of the positive electrode active material on the aluminum foil is 15-16 mg / cm³. 2 And, Battery assembly: The positive electrode plate, separator, negative electrode plate, and electrolyte were assembled into a 2025 type button cell in a glove box filled with argon gas containing less than 5 ppm of both moisture and oxygen. The cell was then left to stand for 6 hours. In this assembly, a 17 mm diameter, 1 mm thick metallic lithium sheet was used for the negative electrode plate, a 25 μm thick polyethylene porous membrane (Celgard 2325) was used for the separator, and the electrolyte contained lithium salt LiPF6 and a solvent (ethylene carbonate (EC) to diethyl carbonate (DEC) in a volume ratio of 1:1). The LiPF6 concentration in the electrolyte was 1 mol / L.

[0120] Initial measurement of Coulomb efficiency: At 25°C, the battery is charged to 4.4V with a constant current of 0.1C, then further charged to 0.02C with a constant voltage to obtain the initial charge ratio capacity C0 of the battery, and then discharged to 3.0V with a constant current of 0.1C to obtain the initial discharge ratio capacity C1 of the battery. The initial Coulomb efficiency of the battery is C1 / C0 × 100%. The charge and discharge voltage range was controlled to 3.0-4.3V, and button-type batteries were charged and discharged at room temperature at 0.1C to evaluate the electrochemical performance of the multi-component cathode material.

[0121] Cycle performance measurement: At 45°C, the battery was charged to 4.3V with a constant current of 1C to obtain the initial charge ratio capacity C2 of the battery, then discharged to 3.0V with a constant current of 1C, and then subjected to 80 cycles of constant current charge and discharge with a current of 1C to obtain the discharge ratio capacity C at the 80th cycle. 80 The initial Coulomb efficiency of the battery = C 80 / C2 × 100%.

[0122] Rate Performance Measurement: The charge / discharge voltage range is controlled to 3.0-4.3V. At room temperature, the button cell battery is charged and discharged for two cycles at 0.1C, then charged and discharged for one cycle each at 0.2C, 0.33C, 0.5C, and 1C. The rate performance of the battery is characterized by the ratio of the initial discharge ratio capacity at 0.1C to the discharge ratio capacity at 1C. Here, the initial discharge ratio capacity at 0.1C is the discharge ratio capacity of the button cell battery after the first cycle, and the discharge ratio capacity at 1C is the discharge ratio capacity of the button cell battery after the sixth cycle.

[0123] Diffusion coefficient measurement: EIS measurement and analysis were employed. The battery was charged to 4.3V with a constant current of 0.1C, charged at a constant voltage for 30 minutes, discharged to 3.0V with a constant current of 0.1C, and then charged to 4.3V with a constant current of 0.1C. A fully charged half-cell was taken, and EIS measurement was performed in the frequency range of (100)kHz~0.01Hz, with an amplitude of 10mV. According to the following formula, Z re and ω -1 / 2 The slope σ of the fitting line can be determined, Z re =R s +R ct +σω -1 / 2 ω = 2πf Here, Z re R is the real part of the measured impedance spectrum. s is the solution resistance, and R ct ω is the charge transfer resistance, ω is the angular frequency, f is the measurement frequency, and σ is the Warburg factor. Furthermore, the lithium ion diffusion coefficient calculation formula is used to determine the material bulk phase Li + Diffusion coefficient D Li + , D Li + =R 2 T 2 / (2A 2 n 4 F 4 C 2 σ 2 ) seek, Here, R is the ideal gas constant, T is the absolute temperature, A is the electrode cross-sectional area, n is the electron transfer rate, F is the Faraday constant, and C is the lithium ion concentration in the electrode.

[0124] [Table 4]

[0125] As can be seen from Table 3, the N of the positive electrode active material in Examples 1-8 (003) *N (104) is 1*10 4 -3*104 Therefore, the positive electrode active material N in Comparative Examples 1-7 (003) *N (104) All are 1*10 4 -3*10 4 Not within the range, as can be seen from Table 4, the charge ratio capacity, discharge ratio capacity, initial Coulomb efficiency, rate performance, and capacity retention rate of the batteries in Examples 1-8 are significantly higher than those of the batteries in Comparative Examples 1-7, and at the same time, the lithium-ion diffusion coefficient is also kept within an appropriate range, thereby, N (003) *N (104) is 1*10 4 -3*10 4 By employing this positive electrode active material, the battery supporting it can achieve high energy density, cycle performance, and rate performance.

[0126] In this specification, any reference to terms such as “one embodiment,” “several embodiments,” “example,” “specific example,” or “several examples” means that the particular features, structures, materials, or properties described with reference to such embodiment or example are included in at least one embodiment or example of this application. In this specification, the general expressions of the above terms do not necessarily apply to the same embodiment or example. In addition, the particular features, structures, materials, or properties described may be incorporated in an appropriate manner in any one or more embodiments or examples. Furthermore, those skilled in the art can combine and combine the various embodiments or examples and the features relating to the various embodiments or examples described herein without contradiction.

[0127] Although embodiments of this application have been presented and described, these embodiments are illustrative and should not be understood as limiting this application. Those skilled in the art will understand that various changes, modifications, substitutions, and variations are possible within the scope of this application. (See related applications for cross-references.)

[0128] This application claims priority and rights to the Chinese patent application filed with the China National Intellectual Property Administration on April 30, 2024, with patent application number 202410545373.0 and title "Positive electrode active material and method for manufacturing the same, positive electrode plate, battery and electrical equipment," the entire contents of which are incorporated herein by reference.

Claims

1. A positive electrode active material comprising a plurality of primary particles, wherein the number of equivalent crystal plane sheets N of the positive electrode active material （００３） (104) Number of equivalent crystal plane sheets N （１０４） is, N （００３） *N （１０４） 1 * 10 ４ -3*10 ４ And, [Number 19] satisfies the condition and D （００３） is the average thickness perpendicular to the direction of the (003) crystal plane in the positive electrode active material microcrystal, with the unit of nm, and d （００３） is the spacing between the (003) crystal planes in the positive electrode active material microcrystal, with the unit of nm, and D （１０４） is the average thickness perpendicular to the direction of the (104) crystal plane in the positive electrode active material microcrystal, with the unit of nm, and d （１０４） is the spacing between the (104) crystal planes in the positive electrode active material microcrystal, with the unit of nm, which is the positive electrode active material.

2. N （００３） *N （１０４） is 1.5 * 10 ４ -2.5*10 ４ The positive electrode active material according to claim 1.

3. (003) Number of equivalent crystal plane sheets N of the positive electrode active material （００３） The positive electrode active material according to claim 1 or 2, wherein the ratio is 80-140.

4. (003) Number of equivalent crystal plane sheets N of the positive electrode active material （００３） The positive electrode active material according to any one of claims 1 to 3, wherein the ratio is 90-130.

5. Number of equivalent (104) crystal plane sheets N of the positive electrode active material （１０４） The positive electrode active material according to any one of claims 1 to 4, wherein the ratio is 130-200.

6. Number of equivalent (104) crystal plane sheets N of the positive electrode active material （１０４） The positive electrode active material according to any one of claims 1 to 5, wherein the value is 140-190.

7. The average thickness D perpendicular to the direction of the crystal plane in the positive electrode active material microcrystal (003) （００３） The positive electrode active material according to any one of claims 1 to 6, wherein the wavelength is 40 nm to 60 nm.

8. The average thickness D perpendicular to the direction of the crystal plane in the positive electrode active material microcrystal (003) （００３） The positive electrode active material according to any one of claims 1 to 7, wherein the wavelength is 45 nm to 55 nm.

9. The spacing d between the crystal planes of the positive electrode active material (003) （００３） The positive electrode active material according to any one of claims 1 to 8, wherein the wavelength is 0.4730 nm - 0.4760 nm.

10. The spacing d between the crystal planes of the positive electrode active material (003) （００３） The positive electrode active material according to any one of claims 1 to 9, wherein the wavelength is 0.4732 nm to 0.4750 nm.

11. The average thickness D perpendicular to the direction of the (104) crystal plane in the positive electrode active material microcrystal. （１０４） The positive electrode active material according to any one of claims 1 to 10, wherein the wavelength is 20 nm to 50 nm.

12. The average thickness D perpendicular to the direction of the (104) crystal plane in the positive electrode active material microcrystal. （１０４） The positive electrode active material according to any one of claims 1 to 11, wherein the wavelength is 30 nm to 40 nm.

13. The spacing d between the (104) crystal planes of the positive electrode active material. （１０４） The positive electrode active material according to any one of claims 1 to 12, wherein the wavelength is 0.2035 nm to 0.2045 nm.

14. The spacing d between the (104) crystal planes of the positive electrode active material. （１０４） The positive electrode active material according to any one of claims 1 to 13, wherein the wavelength is 0.2037 nm to 0.2042 nm.

15. The positive electrode active material includes a substrate, the substrate being Li １＋ａ Ni ｘ Co ｙ Mn ｚ M ｍ O ２ The positive electrode active material according to any one of claims 1 to 14, comprising -0.05 ≤ a ≤ 0.3, 0.8 ≤ x ≤ 1, 0 ≤ y ≤ 0.2, 0 ≤ z ≤ 0.2, 0.002 ≤ m ≤ 0.01, where M is at least one of Sb, Nb, Mg, La, Ti, Al, Sr, Ba, Y, Zr, Ca, Fe, S, Zn, and Ta.

16. The positive electrode active material according to claim 15, further comprising a coating layer formed on at least a portion of the surface of the substrate, wherein the coating layer contains element J, and element J comprises at least one of F, B, Cl, Br, I, S, Al, W, Co, Sn, and Mo.

17. A method for producing a positive electrode active material according to any one of claims 1 to 16, A step of providing a cathode active material precursor, A method comprising the step of first mixing and sintering the positive electrode active material precursor, a lithium source, and a dopant containing element M to obtain a positive electrode active material-fired material.

18. The positive electrode active material precursor is A mixed system containing nickel salt, cobalt salt, manganese salt, precipitant, and complexing agent is pH １ Adjust to pH １ Set the value to 9-12 to obtain precursor crystal nuclei, and The Dv50 of the precursor crystal nuclei is set to 2 μm-4 μm, and the mixed system is pH ２ Adjust to pH ２ It is manufactured by setting the value to 9-13 and obtaining a precursor of the positive electrode active material. Here, pH ２ The value is pH １ The method according to claim 17, which is greater than the value.

19. pH ２ Value and pH １ The method according to claim 18, wherein the difference from the value is 0.1 - 1.

20. The positive electrode active material precursor is The Dv50 of the positive electrode active material precursor is 9 μm - 20 μm. Number of equivalent sheet layers (101) of the positive electrode active material precursor N （１０１） The range is 60-120. (001) Number of equivalent crystal plane sheets N of the positive electrode active material precursor （００１） The range is 20-60. The number of equivalent crystal plane sheets N of the positive electrode active material precursor (100) （１００） The method according to any one of claims 17 to 19, satisfying at least one of the following: that is 110-140.

21. The positive electrode active material precursor is Number of equivalent sheet layers (101) of the positive electrode active material precursor N （１０１） The range is 60-90. (001) Number of equivalent crystal plane sheets N of the positive electrode active material precursor （００１） The range is 20-50, and The number of equivalent crystal plane sheets N of the positive electrode active material precursor (100) （１００） The method according to any one of claims 17 to 20, wherein the value is 110-130.

22. The method according to any one of claims 17 to 21, wherein the temperature of the first mixed sintering is 650°C to 900°C and the time is 4h to 15h.

23. The method according to any one of claims 17 to 22, further comprising the step of second mixing and sintering the positive electrode active material-fired material and the element J-containing coating agent to form an element J-containing coating layer on at least a portion of the surface of the positive electrode active material-fired material.

24. The method according to claim 23, wherein the second mixed sintering is performed at a temperature of 200°C to 700°C and for a time of 3 hours to 10 hours.

25. A positive electrode plate comprising a positive electrode active material described in any one of claims 1 to 16 or a positive electrode active material obtained by the method described in any one of claims 17 to 24.

26. A battery comprising the positive electrode plate described in claim 25.

27. An electrical device including a battery as described in claim 26.

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