High nickel positive electrode material and preparation method thereof, positive electrode sheet, battery and electrical device

Abstract

The present application relates to a high-nickel positive electrode material and a preparation method thereof, a positive electrode plate, a battery and an electrical device. The preparation method of the high-nickel positive electrode material comprises the following steps: mixing a positive electrode material precursor and a lithium source, performing a first calcination treatment at 540°C to 700°C, and cooling to below 80°C to obtain a positive electrode material intermediate A; the chemical formula of the positive electrode material precursor is Ni x Co y M 1‑x‑y (OH)2, where M comprises at least one of Mn and Al, 0.88 < x ≤ 0.99, 0 ≤ y < 0.10, and x + y ≤ 1; the positive electrode material intermediate A is subjected to a second calcination treatment at 600°C to 1000°C to obtain the positive electrode material intermediate B; the positive electrode material intermediate B is washed and then dried. This method for preparing a high-nickel positive electrode material, with each step working synergistically, effectively improves the discharge specific capacity, initial efficiency, and cycle life of the high-nickel positive electrode material. It also addresses the issues of high residual alkali and clogged lithium ion transmission channels in conventional high-nickel positive electrode materials, which hinder performance.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a high-nickel positive electrode material and a preparation method thereof, a positive electrode sheet, a battery, and an electrical device. Background Art

[0002] The widespread use of lithium-ion batteries in electric vehicles and power tools has driven their development towards longer battery life and range. Currently, high-nickel cathode materials offer a clear advantage due to their lower cost and higher energy density. However, traditional high-nickel cathode materials suffer from poor cycling performance and low initial efficiency, limiting the further development of high-nickel lithium-ion batteries. Summary of the Invention

[0003] Based on this, the present application provides a high-nickel positive electrode material with high initial efficiency and good cycle performance, as well as its preparation method, positive electrode plate, battery and electrical device.

[0004] The technical solution of this application to solve the above technical problems is as follows.

[0005] On one hand, the present application provides a method for preparing a high-nickel positive electrode material, comprising the following steps:

[0006] The positive electrode material precursor and the lithium source are mixed, and the first calcination treatment is carried out at 540°C to 700°C, and then cooled to below 80°C to obtain a positive electrode material intermediate A; the chemical formula of the positive electrode material precursor is Ni x Co y M 1-x-y (OH)2, wherein M comprises at least one of Mn and Al, 0.88<x≤0.99, 0≤y<0.10, x+y≤1;

[0007] The positive electrode material intermediate A is subjected to a second calcination treatment at 600° C. to 1000° C. to obtain a positive electrode material intermediate B;

[0008] The positive electrode material intermediate B is washed and then dried.

[0009] In some embodiments, in the method for preparing a high-nickel positive electrode material, the time for the first calcination treatment is 4 hours to 15 hours, and the time for the second calcination treatment is 4 hours to 20 hours.

[0010] In some embodiments, in the method for preparing a high-nickel positive electrode material, the washing liquid used in the washing step is an aqueous solution with a pH value of 4 to 11.

[0011] In some embodiments, in the method for preparing a high-nickel positive electrode material, the total molar ratio of the lithium element in the lithium source to the metal elements in the positive electrode material precursor is (1.00-1.08):1.

[0012] In some embodiments, in the method for preparing a high-nickel positive electrode material, the lithium source includes at least one of lithium hydroxide and lithium carbonate.

[0013] In some embodiments, in the method for preparing the high-nickel positive electrode material, the drying temperature is 100° C. to 200° C., and the drying time is 0.5 h to 8 h.

[0014] In some embodiments, in the method for preparing a high-nickel positive electrode material, in the mixing step, a step of adding a compound containing a first element is further added, and the first element includes at least one of Mg, Ti, Al, Zr, Y, Nb, W, Ce, Sb, Sr and Ta.

[0015] In some embodiments, in the method for preparing a high-nickel positive electrode material, the total molar ratio of the first element to the metal elements in the positive electrode material precursor is (0.006-0.02):1.

[0016] In some embodiments, the method for preparing a high-nickel positive electrode material further includes, after the drying step, a step of forming a coating layer on the surface of the positive electrode material substrate obtained in the drying step; optionally, the material of the coating layer includes a fast ion conductor.

[0017] In some embodiments, in the method for preparing a high-nickel positive electrode material, the step of forming a coating layer includes:

[0018] The positive electrode material matrix is mixed with a compound containing a second element and subjected to a third calcination step, wherein the second element includes at least one of B, W, Al, Zr, Ti, Ce and Nb.

[0019] In some embodiments, in the method for preparing a high-nickel positive electrode material, the temperature of the third calcination treatment is 240° C. to 720° C., and the time of the third calcination treatment is 4 hours to 15 hours.

[0020] On the one hand, the present application also provides a high-nickel positive electrode material prepared using the above-mentioned preparation method.

[0021] On the other hand, the present application provides a high nickel positive electrode material, including a positive electrode material matrix, the chemical formula of the positive electrode material matrix is LiNi x Co y M 1-x-y O2, wherein M includes one or more of Mn and Al, 0.88<x≤0.99, 0≤y<0.10, x+y≤1; the sum of the mass of the layered double metal hydroxide and the layered double metal oxide in the high-nickel positive electrode material accounts for less than 0.1% of the mass percentage of the high-nickel positive electrode material.

[0022] In some embodiments, the residual lithium in the high-nickel positive electrode material accounts for less than 1500 ppm by mass of the high-nickel positive electrode material.

[0023] In some embodiments, the mass percentage of lithium carbonate in the high-nickel positive electrode material is less than 1400 ppm.

[0024] In some embodiments, the positive electrode material matrix in the high-nickel positive electrode material is doped with a first element, and the first element includes at least one of Mg, Ti, Al, Zr, Y, Nb, W, Ce, Sb, Sr and Ta.

[0025] In some embodiments, the high-nickel positive electrode material further includes a coating layer disposed on the surface of the positive electrode material substrate; optionally, the coating layer includes a fast ion conductor.

[0026] In some embodiments, in the high-nickel positive electrode material, the fast ion conductor includes at least one of CeO2, Al2O3, TiO2, WO3, ZrO2, NbO, Li2B4O7 and LiBO2.

[0027] The present application also provides a positive electrode plate, comprising the above-mentioned high-nickel positive electrode material.

[0028] The present application provides a battery comprising the above-mentioned positive electrode plate.

[0029] The present application provides an electrical device comprising the above-mentioned battery.

[0030] Compared with the prior art, the preparation method of the high nickel cathode material of the present application has the following beneficial effects:

[0031] The above-mentioned preparation method of the high-nickel positive electrode material comprises mixing the positive electrode material precursor and the lithium source and then performing a first calcination treatment, cooling, a second calcination treatment, washing and drying in sequence, wherein the positive electrode material precursor and the lithium source are mixed and then subjected to a first calcination treatment under specific temperature conditions, so that the lithium ions can be fully embedded and evenly distributed in the positive electrode material intermediate A, effectively reducing the generation of residual alkali during the second calcination treatment and broadening the lithium ion transmission channel; further cooling to a specific temperature, the two work together to effectively reduce the residual alkali in the subsequent washing step and the byproducts layered double metal hydroxides and layered double metal oxides generated by the transition metal in the high-nickel positive electrode material, thereby reducing the loss of transition metals in the high-nickel positive electrode material and the damage to the structure of the high-nickel positive electrode material caused by the layered double metal hydroxides and layered bimetallic oxides, and at the same time solving the problem of high residual alkali and blocked lithium ion transmission channels in traditional high-nickel positive electrode materials that hinder performance; each step works synergistically to effectively improve the first discharge specific capacity, first efficiency and cycle life of the high-nickel positive electrode material. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] Figure 1 This is an SEM image of the high-nickel positive electrode material prepared in Example 1 of the present application;

[0034] Figure 2 This is the XRD pattern of the high nickel positive electrode material prepared in Example 1 of the present application;

[0035] Figure 3 This is an SEM image of the high-nickel positive electrode material prepared in Comparative Example 1 of this application;

[0036] Figure 4 This is a comparison chart of the cycle performance of the high-nickel positive electrode materials prepared in Example 1 of the present application and Comparative Examples 1 and 2. DETAILED DESCRIPTION

[0037] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are described below. Each example is provided to illustrate, not to limit, the present invention. Indeed, it will be apparent to those skilled in the art that various modifications and variations may be made to the present invention without departing from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment may be used in another embodiment to produce further embodiments.

[0038] Therefore, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents. Other objects, features, and aspects of the present invention are disclosed in or are obvious from the following detailed description. Those skilled in the art will appreciate that this discussion is merely a description of exemplary embodiments and is not intended to limit the broader aspects of the present invention.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0040] The term "comprises", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements limited by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method, article or equipment comprising the elements. The indefinite articles "a" and "an" before the elements or components of the present invention have no restriction on the quantity requirements (i.e., the number of occurrences) of the elements or components. Therefore, "a" or "a" should be interpreted as including one or at least one, and elements or components in the singular also include plural forms, unless the quantity obviously refers only to the singular form. The meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] The weights of the relevant components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also represent the weight ratio between the components. Therefore, as long as the content of the relevant components is proportionally increased or decreased according to the description of the embodiments of the present invention, it is within the scope disclosed in the description of the embodiments of the present invention. Specifically, the weights mentioned in the description of the embodiments of the present invention may be mass units known in the chemical industry, such as μg, mg, g, and kg.

[0042] Except as shown in the operating examples or otherwise indicated, all numbers used in the specification and claims to express the amount of ingredients, physicochemical properties, etc. are understood to be adjusted by the term "about" in all cases. For example, therefore, unless otherwise indicated, the numerical parameters listed in the above specification and the appended claims are approximate values, and those skilled in the art will be able to appropriately change these approximate values using the teachings disclosed herein to seek to obtain the desired properties. The use of numerical ranges expressed as endpoints includes all numbers within the range and any range within the range, for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4 and 5, etc.

[0043] After analysis, it is believed that the traditional high-nickel positive electrode material with x>0.88 has poor cycle performance. The low first efficiency is due to the high residual alkali content in the high-nickel positive electrode material, which leads to serious side reactions during the water washing process. The generated by-products are difficult to eliminate in subsequent processes, which seriously affects the full performance of its electrical performance.

[0044] One embodiment of the present application provides a method for preparing a high-nickel positive electrode material, including steps S10 to S30:

[0045] Step S10: Mix the cathode material precursor and the lithium source, perform a first calcination treatment at 540°C to 700°C, and then cool to below 80°C to obtain the cathode material intermediate A; the chemical formula of the cathode material precursor is Ni x Co y M 1-x-y (OH)2, wherein M includes at least one of Mn and Al, 0.88<x≤0.99, 0≤y<0.10, x+y≤1.

[0046] The first calcination treatment allows lithium ions to be fully diffused and evenly distributed. During the second calcination treatment, lithium ions can completely enter the bulk of each primary particle, increasing the number of active lithium ions and thus improving the coulombic efficiency of the lithium-ion battery.

[0047] It can be understood that x can be, for example, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.99, etc., and y can be, for example, 0.01, 0.02, 0.03, 0.04, 0.05 or 0.09, etc.; the first calcination temperature can be any value between 540°C and 700°C, for example: 540°C, 550°C, 560°C, 580°C, 600°C, 630°C, 650°C, 660°C, 690°C, 700°C; in some examples, it can be within the range formed by any two of these point values as end values, the same below.

[0048] Optionally, the first calcination temperature is 540°C to 650°C.

[0049] By controlling the temperature of the first calcination, the incorporation of lithium ions into the bulk of each primary particle during the second calcination can be further promoted, thereby improving the coulombic efficiency of the lithium-ion battery. However, if the temperature is too low or too high, it is impossible to effectively reduce the byproducts of layered double metal hydroxides and layered double metal oxides produced by the residual alkali in the subsequent washing step that binds to the transition metals in the high-nickel cathode material. Consequently, it is impossible to reduce the loss of transition metals in the high-nickel cathode material and the damage caused to the structure of the high-nickel cathode material by the layered double metal hydroxides and layered double metal oxides.

[0050] In some examples, in step S10 , the first calcination treatment lasts for 4 hours to 15 hours.

[0051] It can be understood that the first roasting time can be any value between 4 hours and 15 hours, for example, it can be 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 10 hours, or 15 hours.

[0052] Optionally, the first calcination treatment lasts for 6 hours to 9 hours.

[0053] In some examples, in step S10, the total molar ratio of the lithium element in the lithium source to the metal elements in the positive electrode material precursor is (1.00-1.08):1.

[0054] It can be understood that the total molar ratio of the lithium element in the lithium source to the metal elements in the positive electrode material precursor includes but is not limited to 1.00:1, 1.01:1, 1.02:1, 1.03:1, 1.05:1, 1.06:1, and 1.08:1.

[0055] In some examples, in step S10 , the lithium source includes at least one of lithium hydroxide and lithium carbonate.

[0056] In some examples, the mixing step in step S10 further includes a step of adding a compound containing a first element, and the first element includes at least one of Mg, Ti, Al, Zr, Y, Nb, W, Ce, Sb, Sr and Ta.

[0057] It should be noted that the compound containing the first element can be an oxide or carbonate of the first element, such as: MgO, TiO2, Al2O3, ZrO2, Y2O3, Nb2O5, WO3, CeO2, Sb2O3, Sb2O5, SrO, Ta2O5, Mg(OH)2, Zr(OH)4, Al(OH)3, Ti(OH)4, Sr(OH)2, MgCO3, Al2(CO3)3, SrCO3, Zr3(CO3)O5, etc.

[0058] It can be understood that in step S10, the added compound containing the first element exists in the positive electrode material matrix in the form of element doping after calcination.

[0059] In some examples, in step S10, the total molar ratio of the first element to the metal elements in the positive electrode material precursor is (0.006-0.02):1.

[0060] It can be understood that the total molar ratio of the first element to each metal element in the positive electrode material precursor includes but is not limited to 0.006:1, 0.008:1, 0.010:1, 0.012:1, 0.014:1, 0.015:1, 0.016:1, 0.018:1, and 0.02:1.

[0061] In some examples, in step S10 , the mass of the compound containing the first element accounts for 6000 ppm or more of the total mass of the raw materials of the positive electrode material intermediate A.

[0062] It is understood that the first calcination is carried out in an atmosphere containing oxygen; it is further understood that after the first calcination treatment, cooling is carried out in an oxygen atmosphere, and the cooling method is not limited, including but not limited to air cooling, water cooling, natural cooling, etc.

[0063] Step S20: subjecting the cathode material intermediate A to a second calcination treatment at 600° C. to 1000° C. to obtain a cathode material intermediate B.

[0064] It can be understood that the temperature of the second calcination treatment can be any value between 600°C and 1000°C, for example, it can be 600°C, 650°C, 700°C, 750°C, 800°C, 850°C, 900°C, 950°C or 1000°C.

[0065] Optionally, the temperature of the second calcination treatment is 740°C to 800°C.

[0066] Furthermore, the temperature of the second calcination process is higher than the temperature of the first calcination process.

[0067] Furthermore, the difference between the temperature of the second calcination process and the temperature of the first calcination process is 100°C to 300°C.

[0068] It can be understood that the difference between the temperature of the second calcination treatment and the temperature of the first calcination treatment includes but is not limited to 100°C, 120°C, 150°C, 180°C, 200°C, 220°C, 250°C, 280°C, and 300°C.

[0069] Optionally, the difference between the temperature of the second calcination process and the temperature of the first calcination process is 150° C. to 200° C.

[0070] In some examples, in step S20 , the second calcination treatment lasts for 4 hours to 20 hours.

[0071] It can be understood that the time of the second roasting treatment can be 4h, 5h, 6h, 7h, 8h, 9h, 10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h, 18h, 19h or 20h, or other values between 4h and 20h.

[0072] Optionally, the second calcination treatment lasts for 12 hours to 20 hours.

[0073] In some examples, in step S20, after the second calcination step, the positive electrode material obtained in the second calcination step is further crushed and sieved.

[0074] Step S30: washing the positive electrode material intermediate B and then drying it.

[0075] The above-mentioned preparation method of high-nickel positive electrode material, by mixing the positive electrode material precursor and the lithium source and then performing a first calcination treatment under specific temperature conditions, can make the lithium ions fully embedded and evenly distributed in the positive electrode material intermediate A, effectively reducing the generation of residual alkali during the second calcination treatment and broadening the lithium ion transmission channel; further cooling to a specific temperature, the two work together to effectively reduce the residual alkali in the subsequent washing step and the byproducts layered double metal hydroxides and layered bimetallic oxides produced by the transition metal in the high-nickel positive electrode material, thereby reducing the loss of transition metals in the high-nickel positive electrode material and the damage to the structure of the high-nickel positive electrode material caused by the layered double metal hydroxides and layered bimetallic oxides, and at the same time solves the problem of high residual alkali and blocked lithium ion transmission channels in traditional high-nickel positive electrode materials that hinder performance; the synergistic effect of each step effectively improves the discharge specific capacity, first efficiency and cycle life of the high-nickel positive electrode material.

[0076] The above-mentioned method for preparing high-nickel positive electrode material can save production costs and is conducive to industrial production.

[0077] In some examples, in step S30 , the washing liquid used in the washing step is an aqueous solution with a pH value of 4 to 11.

[0078] It is understood that the pH value of the aqueous solution used in the washing step can be any value between 4 and 11, for example, 4, 5, 6, 7, 8, 9, 10, or 11.

[0079] Optionally, the pH value of the aqueous solution is 5-8.

[0080] It is understood that the aqueous solution used for washing can be water, a weakly acidic aqueous solution, or a weakly alkaline aqueous solution, and the pH value can be within the range of 4 to 11.

[0081] Furthermore, weakly acidic aqueous solutions include but are not limited to carbonic acid solutions, hypochlorous acid solutions, hydrosulfuric acid solutions, ammonium chloride solutions, etc.; weakly alkaline aqueous solutions include but are not limited to ammonia water, sodium carbonate solutions, and sodium bicarbonate solutions.

[0082] In some examples, in step S30 , the drying temperature is 100° C. to 200° C., and the drying time is 0.5 h to 8 h.

[0083] It will be understood that the drying temperature includes but is not limited to 100°C, 110°C, 130°C, 150°C, 160°C, 180°C, and 200°C, and the drying time includes but is not limited to 0.5h, 1.0h, 2.0h, 3.0h, 4.0h, 5.0h, 6.0h, 7.0h, and 8.0h.

[0084] Optionally, the drying temperature is 120° C. to 180° C., and the drying time is 1.5 h to 4 h.

[0085] In some examples, in step S30 , after the washing step and before the drying step, the method further includes dehydrating the washed positive electrode material.

[0086] It is understood that the dehydration method is not limited, and dehydration can be performed by filtering or other methods to reduce the subsequent drying time.

[0087] In some examples, after step S30, step S40 is further included:

[0088] In step S30, a coating layer is formed on the surface of the positive electrode material substrate obtained in the drying step, and the material of the coating layer includes a fast ion conductor.

[0089] Furthermore, the step of forming the coating layer includes step S41:

[0090] The positive electrode material matrix obtained in the drying step S30 is mixed with a compound containing a second element and subjected to a third calcination step, wherein the second element is selected from at least one of B, W, Al, Zr, Ti, Ce and Nb.

[0091] It can be understood that the compound containing the second element forms the oxide of the second element after calcination, which can act as a fast ion conductor to prevent the electrochemical decomposition of the active crystal surface of the high-nickel positive electrode material during the charge and discharge process, thereby achieving effective protection of the active crystal surface; its high-valent characteristics can stabilize the oxygen atoms of the matrix material, further enhance the stability of the surface structure of the high-nickel positive electrode material, and further improve the electrochemical performance.

[0092] It can be understood that among the above-mentioned second elements, W, Al, Zr, Ti, Ce and Nb are metal elements.

[0093] In some examples, the compound containing the second element may be an oxide of a metal element in the second element, such as CeO2, Al2O3, TiO2, WO3, ZrO2, NbO, and the compound containing the B element may be H3BO3.

[0094] It can be understood that when the second element is a metal element, the compound containing the second element exists in the coating layer in the form of an oxide after being calcined in step S40; when the second element is element B, the compound containing the second element exists in the coating layer in the form of Li2B4O7, LiBO2 or a combination thereof after being calcined in step S40.

[0095] In some examples, in step S40 , the temperature of the third calcination process is 240° C. to 720° C., and the time of the third calcination process is 4 hours to 15 hours.

[0096] It can be understood that the temperature of the third roasting treatment can be any value between 240°C and 720°C, for example, it can be 240°C, 260°C, 300°C, 350°C, 400°C, 500°C, 600°C, 700°C or 720°C, etc.; the time of the third roasting treatment can be 4h, 5h, 6h, 7h, 8h, 9h, 10h, 11h, 12h, 13h, 14h or 15h, or other values between 4h and 15h.

[0097] In some examples, in step S40, the mass ratio of the compound containing the second element to the positive electrode material matrix obtained in the drying step of step S30 is (0.0001-0.005):1.

[0098] It can be understood that the ratio of the mass of the compound containing the second element to the mass of the high nickel positive electrode material matrix includes but is not limited to 0.0001:1, 0.00012:1, 0.00015:1, 0.00018:1, 0.0002:1, 0.00022:1, 0.00025:1, 0.00028:1, 0.0003:1, 0.0005:1, 0.0008:1, 0.001:1, 0.002:1, 0.003:1, 0.0035:1, 0.004:1, 0.0045:1, 0.005:1, etc.

[0099] One embodiment of the present application provides a high-nickel positive electrode material, which is prepared using the above-mentioned preparation method.

[0100] It can be understood that the high-nickel positive electrode material provided in this application has a high first discharge specific capacity and first efficiency, and a long cycle life.

[0101] Another embodiment of the present application provides a high nickel positive electrode material, including a positive electrode material matrix, the chemical formula of the positive electrode material matrix is LiNix Co y M 1-x-y O2, wherein M includes one or more of Mn and Al, 0.88<x≤0.99, 0≤y<0.10, x+y≤1; the mass percentage of the layered double metal hydroxide and the layered double metal oxide in the high nickel positive electrode material is less than 0.1%.

[0102] By controlling the content of layered double hydroxides and layered double metal oxides in high-nickel positive electrode materials, the loss of transition metals in the high-nickel positive electrode materials and the damage to the structure of the high-nickel positive electrode materials caused by layered double metal hydroxides and layered double metal oxides can be reduced, thereby effectively improving the first discharge specific capacity, first efficiency and cycle life of the high-nickel positive electrode materials.

[0103] It can be understood that x can be, for example, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.99, etc., and y can be, for example, 0.01, 0.02, 0.03, 0.04, 0.05 or 0.09, etc.

[0104] In some of these examples, the layered double hydroxide in the high nickel cathode material has the formula P r Q s (OH)4, layered bimetallic oxide is P r Q s O2, P is one or more of Ni, Co, Mn or Al, Q is one or more of Mg, Ti, Al, Zr, Y, Nb, W, Ce, Sb, Sr or Ta, 0<r<1, 0<s<1, r+s=1.

[0105] In some of these examples, the residual lithium in the high-nickel cathode material accounts for less than 1500 ppm by mass of the high-nickel cathode material.

[0106] In some of these examples, the lithium carbonate in the high nickel positive electrode material accounts for less than 1400 ppm by mass of the high nickel positive electrode material.

[0107] By further controlling the residual lithium and lithium carbonate content in high-nickel positive electrode materials, the problems of high residual alkali and blocked lithium ion transmission channels in traditional high-nickel positive electrode materials that hinder performance are solved, thereby further improving the first discharge specific capacity, first efficiency and cycle life of high-nickel positive electrode materials.

[0108] In some examples, the positive electrode material matrix in the high-nickel positive electrode material is doped with a first element, and the first element is selected from at least one of Mg, Ti, Al, Zr, Y, Nb, W, Ce, Sb, Sr and Ta.

[0109] Furthermore, the molar ratio of the first element to the positive electrode material matrix is (0.006-0.02):1.

[0110] In some examples, the high-nickel positive electrode material further includes a coating layer disposed on the surface of the positive electrode material substrate, and the material of the coating layer includes a fast ion conductor.

[0111] Further, the fast ion conductor includes at least one element of B, W, Al, Zr, Ti, Ce, and Nb.

[0112] Furthermore, the fast ion conductor includes at least one of CeO2, Al2O3, TiO2, WO3, ZrO2, NbO, Li2B4O7 and LiBO2.

[0113] Furthermore, the total mass of the coating layer and the mass of the positive electrode material matrix are (0.0001-0.005):1.

[0114] One embodiment of the present application provides a positive electrode plate, comprising the above-mentioned high-nickel positive electrode material or the high-nickel positive electrode material prepared by the above-mentioned preparation method.

[0115] It should be noted that the above-mentioned positive electrode plate includes a positive electrode current collector and a positive electrode active material layer provided on at least one surface of the positive electrode current collector. The positive electrode active material layer includes a positive electrode active material, a conductive agent and a binder. The positive electrode active material can be the above-mentioned high-nickel positive electrode material or the high-nickel positive electrode material prepared by the above-mentioned preparation method. The conductive agent and the binder are not particularly limited, and the conductive agents and binders commonly used in the art can be used. For example, the conductive agent can be carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanotubes and graphene or a mixture thereof, and the binder includes but is not limited to vinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose, polytetrafluoroethylene, etc. The preparation process of the above-mentioned positive electrode plate includes but is not limited to: coating a slurry obtained by mixing the positive electrode active material, the conductive agent, the binder and the solvent on the positive electrode current collector, and sequentially performing the steps of drying, rolling and slicing to obtain the positive electrode plate.

[0116] One embodiment of the present application provides a battery, comprising the above-mentioned positive electrode sheet.

[0117] One embodiment of the present application provides the use of the above-mentioned high-nickel positive electrode material or the high-nickel positive electrode material prepared by the above-mentioned preparation method in the preparation of a lithium-ion battery. Another embodiment of the present application provides a lithium-ion battery comprising the above-mentioned positive electrode sheet.

[0118] The preparation method of the lithium-ion battery includes, but is not limited to, laminating or winding the aforementioned positive electrode sheet, separator, and negative electrode sheet to form an electrode assembly, assembling the electrode assembly with a housing, and injecting an electrolyte into the housing to produce the battery. The separator can be a PE film or a PP film, and the negative electrode material can be graphite, soft carbon, hard carbon, composite carbon, silicon material, or metallic lithium.

[0119] Another embodiment of the present application provides an electrical device including the above-mentioned lithium-ion battery.

[0120] The above-mentioned electrical devices include but are not limited to bicycles, calculators, portable recorders, radios, backup power supplies, lighting fixtures, toys, power tools, laptops, mobile computers, game consoles, LCD TVs, motorcycles, motors, cars, cameras, etc.

[0121] The present application will be described in further detail below in conjunction with specific implementation methods, but the implementation methods of the present application are not limited thereto.

[0122] The experimental raw materials used in the following examples and comparative examples can be purchased from the market or prepared according to conventional methods well known to those skilled in the art.

[0123] Example 1

[0124] In this embodiment, the lithium source is LiOH, the compound containing the first element is ZrO2, Al2O3 and Sb2O3, and the high nickel cathode material precursor is Ni 0.90 Co 0.06 Mn 0.04 (OH)2.

[0125] The preparation method of high nickel positive electrode material comprises the following steps:

[0126] S1. LiOH, ZrO2, Al2O3, Sb2O3 and Ni 0.90 Co 0.06 Mn 0.04 (OH)2 was mixed in a molar ratio of 1.04:0.003:0.002:0.001:1, and the mixture was calcined at 600°C for 6 hours and then cooled to below 80°C to obtain intermediate A;

[0127] S2. The intermediate A obtained in step S1 is calcined at 800°C for 12 hours and then crushed and sieved to obtain intermediate B, which is LiNi doped with Zr, Al and Sb. 0.90 Co 0.06 Mn 0.04 O2;

[0128] S3. The intermediate B obtained in step S2 was washed in an aqueous sodium bicarbonate solution having a pH value of 8, and then dried at 150 ° C for 4 h to obtain a high-nickel cathode material matrix;

[0129] S4. The high nickel cathode material matrix obtained in step S3, H3BO3 and Al2O3 were fully mixed in a molar ratio of 1:0.001:0.001 (calculated by element), and then calcined at 280 ° C in an oxygen atmosphere for 9 hours to form a coating layer containing Li2B4O7, LiBO2 and Al2O3 on the surface of the high nickel cathode material matrix. After crushing and screening, a high nickel cathode material was obtained, the SEM image of which is shown as follows: Figure 1 As shown, the XRD pattern is Figure 2 shown.

[0130] Example 2

[0131] In this embodiment, the lithium source is LiOH, the compounds containing the first element are ZrO2, SrO and Sb2O3, and the precursor of the high nickel positive electrode material is Ni 0.92 Co 0.05 Mn 0.03 (OH)2.

[0132] The preparation method of high nickel positive electrode material comprises the following steps:

[0133] S1. LiOH, ZrO2, SrO, Sb2O3 and Ni 0.92 Co 0.05 Mn 0.03 (OH)2 was mixed in a molar ratio of 1.035:0.003:0.002:0.0015:1, and the mixture was calcined at 580°C for 8 hours and then cooled to below 80°C to obtain intermediate A;

[0134] S2. The intermediate A obtained in step S1 is calcined at 775°C for 15 hours and then crushed and sieved to obtain intermediate B. Intermediate B is LiNi doped with Zr, Sr and Sb. 0.92 Co 0.05 Mn 0.03 O2;

[0135] S3. The intermediate B obtained in step S2 was washed in deionized water at a pH of 7, and then dried at 160 ° C for 2 h to obtain a high-nickel cathode material matrix;

[0136] S4. After fully mixing the high-nickel positive electrode material matrix obtained in the previous step S3, WO3 and Al2O3 in a molar ratio of 1:0.001:0.001 (calculated by element), calcining at 300°C for 8h to form a coating layer on the surface of the high-nickel positive electrode material matrix, and then crushing and screening to obtain a high-nickel positive electrode material.

[0137] Example 3

[0138] In this embodiment, the lithium source is LiOH, the compound containing the first element is TiO2, SrO and Y2O3, and the high nickel cathode material precursor is Ni 0.95 Co 0.04 Mn 0.01 (OH)2.

[0139] The preparation method of high nickel positive electrode material comprises the following steps:

[0140] S1. LiOH, TiO2, SrO, Y2O3 and Ni 0.95 Co 0.04 Mn 0.01 (OH)2 was mixed in a molar ratio of 1.035:0.0025:0.0025:0.0015:1, and the mixture was calcined at 560°C for 9 hours and then cooled to below 80°C to obtain intermediate A;

[0141] S2. The intermediate A obtained in step S1 is calcined at 760°C for 17 hours and then crushed and sieved to obtain intermediate B, which is LiNi doped with Ti, Sr and Y. 0.95 Co 0.04 Mn 0.01 O2;

[0142] S3. The intermediate B obtained in step S2 was washed in an aqueous ammonium chloride solution having a pH value of 6, and then dried at 180 ° C for 1.5 h to obtain a high-nickel cathode material matrix;

[0143] S4. After fully mixing the high-nickel positive electrode material matrix obtained in the previous step S3, TiO2 and Al2O3 in a molar ratio of 1:0.0005:0.0015 (calculated by element), calcining at 400°C for 8h to form a coating layer on the surface of the high-nickel positive electrode material matrix, and then crushing and screening to obtain a high-nickel positive electrode material.

[0144] Example 4

[0145] In this embodiment, the lithium sources are LiOH and Li2CO3, the compounds containing the first element are ZrO2, Nb2O5 and Sb2O3, and the precursor of the high nickel cathode material is Ni 0.98 Co 0.01 Mn 0.01 (OH)2.

[0146] The preparation method of high nickel positive electrode material comprises the following steps:

[0147] S1. LiOH, Li2CO3, ZrO2, Nb2O5, Sb2O3 and Ni 0.98 Co 0.01 Mn 0.01 (OH)2 was mixed in a molar ratio of 1.03:0.01:0.003:0.001:0.001:1, and the mixture was calcined at 540°C for 9 hours and then cooled to below 80°C to obtain intermediate A;

[0148] S2. The intermediate A obtained in step S1 is calcined at 740°C for 20 hours and then crushed and sieved to obtain intermediate B, which is LiNi doped with Zr, Nb and Sb. 0.98 Co 0.01 Mn 0.01 O2;

[0149] S3. The intermediate B obtained in step S2 was washed in a carbonated water solution having a pH value of 5, and then dried at 120 ° C for 3 h to obtain a high-nickel cathode material matrix;

[0150] S4. After fully mixing the high-nickel positive electrode material matrix obtained in the previous step S3, CeO2 and Al2O3 in a molar ratio of 1:0.0005:0.0015 (calculated by element), calcining at 600°C for 7h to form a coating layer on the surface of the high-nickel positive electrode material matrix, and then crushing and screening to obtain a high-nickel positive electrode material.

[0151] Example 5

[0152] The process of Example 5 is basically the same as Example 1, except that the calcination temperature in step S1 of Example 1 is adjusted to 650°C.

[0153] Comparative Example 1

[0154] In this embodiment, the lithium source is LiOH, the compound containing the first element is ZrO2, Al2O3 and Sb2O3, and the high nickel cathode material precursor is Ni 0.90 Co 0.06 Mn 0.04 (OH)2.

[0155] The preparation method of high nickel positive electrode material comprises the following steps:

[0156] S1. LiOH, ZrO2, Al2O3, Sb2O3 and Ni 0.90 Co 0.06 Mn 0.04(OH)2 was mixed in a molar ratio of 1.04:0.003:0.002:0.001:1, and the mixture was calcined at 800 ° C for 12 hours and then crushed and sieved to obtain intermediate C. Intermediate C is LiNi doped with Zr, Al and Sb. 0.90 Co 0.06 Mn 0.04 O2;

[0157] S2. The intermediate C obtained in step S1 was washed in a sodium bicarbonate solution having a pH value of 8, and then dried at 150 ° C for 4 h to obtain a high-nickel positive electrode material matrix;

[0158] S3. The high nickel cathode material matrix obtained in step S2, H3BO3 and Al2O3 were fully mixed in a molar ratio of 1:0.001:0.001 (calculated by element), and then calcined at 280 ° C for 9 hours to form a coating layer on the surface of the high nickel cathode material matrix. After crushing and screening, a high nickel cathode material was obtained, the SEM image of which is shown as follows: Figure 3 shown.

[0159] Comparative Example 2

[0160] In this embodiment, the lithium source is LiOH, the compound containing the first element is ZrO2, Al2O3 and Sb2O3, and the high nickel cathode material precursor is Ni 0.90 Co 0.06 Mn 0.04 (OH)2.

[0161] The preparation method of high nickel positive electrode material comprises the following steps:

[0162] S1. LiOH, ZrO2, Al2O3, Sb2O3 and Ni 0.90 Co 0.06 Mn 0.04 (OH)2 was mixed in a molar ratio of 1.04:0.003:0.002:0.001:1, and the mixture was calcined at 600°C for 6 hours and then cooled to below 80°C to obtain intermediate A;

[0163] S2. After mixing the intermediate A obtained in step S1, calcining at 800°C for 12 hours, and then crushing and screening to obtain a high-nickel positive electrode material matrix. The high-nickel positive electrode material matrix is LiNi doped with Zr, Al and Sb. 0.90 Co 0.06 Mn 0.04 O2;

[0164] S3. After fully mixing the high-nickel positive electrode material matrix obtained in step S2, H3BO3 and Al2O3 in a molar ratio of 1:0.001:0.001 (calculated by element), calcining at 280°C for 9 hours to form a coating layer on the surface of the high-nickel positive electrode material matrix, and then crushing and screening to obtain a high-nickel positive electrode material.

[0165] Comparative Example 3

[0166] The process is basically the same as Example 1, except that the calcination temperature in step S1 of Example 1 is adjusted to 480° C., as follows:

[0167] In this embodiment, the lithium source is LiOH, the compound containing the first element is ZrO2, Al2O3 and Sb2O3, and the high nickel cathode material precursor is Ni 0.90 Co 0.06 Mn 0.04 (OH)2.

[0168] The preparation method of high nickel positive electrode material comprises the following steps:

[0169] S1. LiOH, ZrO2, Al2O3, Sb2O3 and Ni 0.90 Co 0.06 Mn 0.04 (OH)2 was mixed in a molar ratio of 1.04:0.003:0.002:0.001:1, and the mixture was calcined at 480°C for 6 hours and then cooled to below 80°C to obtain intermediate A;

[0170] S2. After mixing the intermediate A obtained in step S1, calcining at 800°C for 12 hours, and then crushing and screening to obtain intermediate B, which is LiNi doped with Zr, Al and Sb. 0.90 Co 0.06 Mn 0.04 O2;

[0171] S3. The intermediate B obtained in step S2 was washed in a sodium bicarbonate solution having a pH value of 8, and then dried at 150 ° C for 4 h to obtain a high-nickel cathode material matrix;

[0172] S4. After fully mixing the high-nickel positive electrode material matrix obtained in the previous step S3, H3BO3 and Al2O3 in a molar ratio of 1:0.001:0.001 (calculated by element), calcining at 280°C for 9 hours to form a coating layer on the surface of the high-nickel positive electrode material matrix, and then crushing and screening to obtain a high-nickel positive electrode material.

[0173] Comparative Example 4

[0174] The process is basically the same as Example 1, except that the calcination temperature in step S1 of Example 1 is adjusted to 750°C in Comparative Example 4.

[0175] Comparative Example 5

[0176] In this embodiment, the lithium source is LiOH, the compound containing the first element is ZrO2, Al2O3 and Sb2O3, and the high nickel cathode material precursor is Ni 0.90 Co 0.06 Mn 0.04 (OH)2.

[0177] The preparation method of high nickel positive electrode material comprises the following steps:

[0178] S1. LiOH, ZrO2, Al2O3, Sb2O3 and Ni 0.90 Co 0.06 Mn 0.04 (OH)2 was mixed in a molar ratio of 1.04:0.003:0.002:0.001:1, and the mixture was calcined at 600°C for 6 hours, and then calcined at 800°C for 12 hours, and then pulverized and sieved to obtain intermediate D, which is LiNi doped with Zr, Al and Sb. 0.90 Co 0.06 Mn 0.04 O2;

[0179] S2. The intermediate D obtained in step S1 was washed in a sodium bicarbonate solution with a pH value of 8, and then dried at 150 ° C for 4 hours to obtain a high nickel positive electrode material matrix, which includes LiNi 0.90 Co 0.06 Mn 0.04 O2;

[0180] S3. After fully mixing the high-nickel positive electrode material matrix obtained in step S2, H3BO3 and Al2O3 in a molar ratio of 1:0.001:0.001 (calculated by element), calcining at 280°C for 9 hours to form a coating layer on the surface of the high-nickel positive electrode material matrix, and then crushing and screening to obtain a high-nickel positive electrode material.

[0181] The main parameters of each embodiment and comparative example are shown in Table 1.

[0182] Table 1

[0183]

[0184] Residual alkali content, Li element content and electrochemical performance test

[0185] The residual alkali (LiOH and Li2CO3) content in the high-nickel positive electrode materials prepared in each embodiment and comparative example was tested by titration, and the total residual alkali content Li+ was obtained by the formula Li+=LiOH*7 / 24+Li2CO3*14 / 74; a high-resolution electron microscope was used to observe the number of layered double metal hydroxides and / or layered bimetallic oxides in the high-nickel positive electrode material under a field of view of 500 times (if the number is greater than 2, it is deemed that the content exceeds 0.1wt% of the total mass of the high-nickel positive electrode material). The test results are shown in Table 2.

[0186] Table 2

[0187]

[0188] As can be seen from the data in Table 2, compared with Example 1, Comparative Example 1 did not undergo the first calcination treatment, resulting in more than two layered double hydroxides / layered double oxides being clearly observed under the 500x SEM photograph, indicating that the first calcination treatment at a specific temperature and cooling to a specific temperature before the second calcination treatment can reduce the formation of layered double hydroxide / layered double oxide by-products; Comparative Example 2 did not perform a washing step after the calcination step, and the LiOH and Li2CO3 contents in the high-nickel positive electrode material increased significantly, and the total residual lithium content exceeded 1800 ppm, indicating that the residual alkali content can be effectively reduced after washing in the examples; Comparative Examples 3 and 4, the temperature of the first calcination treatment was adjusted to 480°C or 750°C, resulting in more than two layered double hydroxides / layered double oxides being clearly observed under the 500x SEM photograph; Comparative Example 5, after the first calcination treatment, the second calcination treatment was performed immediately without cooling to a specific temperature. The Li2CO3 content in the high-nickel positive electrode material increased, hindering lithium ion conduction, resulting in a decrease in the discharge specific capacity.

[0189] The high-nickel positive electrode materials prepared in each example and comparative example were made into positive electrode sheets. The positive electrode sheets were prepared in a mass ratio of high-nickel positive electrode material: conductive agent SUPER carbon black: PVDF = 96.5:2:1.5. The above positive electrode sheets were assembled into button cells, and then the initial discharge specific capacity, initial efficiency, and capacity retention after 100 cycles were tested. The initial capacity of the button cells was tested under the conditions of LR 2032, 0.3C, 2.5-4.25V, vs. Li + / Li, button battery initial capacity test conditions are LR 2032, 0.5C, 2.5 ~ 4.25V, vs.Li + / Li, the test results are shown in Table 3, and the cycle performance comparison of the high nickel positive electrode materials prepared in Example 1, Comparative Example 1 and Comparative Example 2 is shown in Table 3. Figure 4 shown.

[0190] Table 3

[0191]

[0192] It can be seen from the data in Table 3 that the high-nickel positive electrode material prepared in the embodiment of the present application has good kinetic properties, the assembled battery has a high discharge capacity, a high first efficiency, and good cycle performance, and has broad application prospects in the field of lithium-ion batteries; Comparative Example 1 was not treated by the first calcination treatment, resulting in insufficient internal diffusion of lithium ions during the second calcination process, uneven surface distribution, high alkaline content on the surface of the positive electrode material during the washing process, residual lithium combined with transition metals to produce a large amount of by-products, which seriously damaged the surface of the positive electrode material, and significantly reduced the discharge capacity, first efficiency and cycle performance; Comparative Example 2 was not washed, resulting in a high residual lithium content on the surface, and the lithium ion transmission channel was severely blocked, resulting in a significant decrease in the first discharge capacity and efficiency.

[0193] Will Figure 1 and Figure 3 By comparison, it can be seen that the surface of the high-nickel positive electrode material prepared in Example 1 is clean and no by-products are generated, while the high-nickel positive electrode material prepared in Comparative Example 1 contains a large amount of layered by-products.

[0194] In summary, it can be shown that the high nickel cathode material of the present application has the advantages of high first discharge specific capacity and first efficiency, and good cycle performance.

[0195] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0196] The embodiments described above only express several implementation methods of the present application, which are convenient for understanding the technical solutions of the present application in a specific and detailed manner, but they cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several variations and improvements can be made, which all fall within the scope of protection of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the scope of protection of the claims attached to the present application. Therefore, the scope of protection of the patent of this application shall be based on the content of the attached claims, and the description and drawings can be used to interpret the content of the claims.

Claims

1. A method for preparing a high-nickel positive electrode material, characterized in that: The following steps are involved: The positive electrode material precursor and the lithium source are mixed, and a first calcination treatment is performed at 560°C to 650°C, and then cooled to below 80°C to obtain a positive electrode material intermediate A; the chemical formula of the positive electrode material precursor is Ni x Co y M 1-x-y (OH)2, wherein M includes at least one of Mn and Al, 0.88<x≤0.99, 0≤y<0.10, x+y≤1, and the first calcination treatment time is 4h~15h; The cathode material intermediate A is subjected to a second calcination treatment at 700° C. to 850° C. to obtain a cathode material intermediate B; the second calcination treatment time is 4 hours to 20 hours, and the difference between the second calcination treatment temperature and the first calcination treatment temperature is 150° C. to 180° C.; The positive electrode material intermediate B is washed and then dried, wherein the washing liquid used in the washing step is an aqueous solution with a pH value of 4 to 11; The sum of the mass of the layered double metal hydroxide and the layered double metal oxide in the high-nickel positive electrode material accounts for less than 0.1% of the mass of the high-nickel positive electrode material.

2. The method for preparing a high nickel cathode material according to claim 1, wherein: The temperature of the second calcination treatment is 760°C to 800°C.

3. The method for preparing a high nickel cathode material according to claim 1, wherein: The preparation method includes at least one of the following features: (1) The total molar ratio of the lithium element in the lithium source to the metal elements in the positive electrode material precursor is (1.00-1.08):1; (2) The lithium source includes at least one of lithium hydroxide and lithium carbonate; (3) The drying temperature is 100°C to 200°C, and the drying time is 0.5h to 8h.

4. The method for preparing a high-nickel cathode material according to any one of claims 1 to 3, wherein: In the mixing step, there is also a step of adding a compound containing a first element, wherein the first element includes at least one of Mg, Ti, Al, Zr, Y, Nb, W, Ce, Sb, Sr and Ta.

5. The method for preparing a high nickel cathode material according to claim 4, wherein: The total molar ratio of the first element to the metal elements in the positive electrode material precursor is (0.006-0.02):

1.

6. The method for preparing a high-nickel cathode material according to any one of claims 1 to 3 and 5, wherein: After the drying step, the method further includes a step of forming a coating layer on the surface of the positive electrode material substrate obtained in the drying step.

7. The method for preparing a high-nickel cathode material according to claim 6, wherein: The material of the coating layer includes a fast ion conductor.

8. The method for preparing a high-nickel cathode material according to claim 7, wherein: The step of forming the coating layer comprises: The positive electrode material matrix is mixed with a compound containing a second element and subjected to a third calcination treatment, wherein the second element includes at least one of B, W, Al, Zr, Ti, Ce and Nb.

9. The method for preparing a high-nickel cathode material according to claim 8, wherein: The temperature of the third calcination treatment is 240° C. to 720° C., and the time of the third calcination treatment is 4 hours to 15 hours.

10. A high nickel cathode material, characterized in that: The preparation method is described in any one of claims 1 to 9.

11. The high nickel cathode material according to claim 10, wherein: It includes at least one of the following features (1) to (2): (1) The residual lithium in the high-nickel positive electrode material accounts for less than 1500 ppm by mass of the high-nickel positive electrode material; (2) The mass percentage of lithium carbonate in the high-nickel positive electrode material is less than 1400 ppm.

12. The high nickel cathode material according to any one of claims 10 to 11, characterized in that: The positive electrode material matrix in the high-nickel positive electrode material is doped with a first element, and the first element includes at least one of Mg, Ti, Al, Zr, Y, Nb, W, Ce, Sb, Sr and Ta.

13. The high nickel cathode material according to claim 12, wherein: The high-nickel positive electrode material further includes a coating layer arranged on the surface of the positive electrode material substrate.

14. The high nickel cathode material according to claim 13, wherein: The material of the coating layer includes a fast ion conductor.

15. The high nickel cathode material according to claim 14, wherein: The fast ion conductor includes at least one of CeO2, Al2O3, TiO2, WO3, ZrO2, NbO, Li2B4O7 and LiBO2.

16. A positive electrode plate, characterized in that: The invention comprises the high-nickel positive electrode material according to any one of claims 10 to 15.

17. A battery, characterized in that: Including the positive electrode sheet according to claim 16.

18. An electrical device, characterized in that: Including the battery according to claim 17.

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