Aluminum-magnesium co-doped cobalt carbonate precursor as well as preparation method and application thereof

Abstract

The invention discloses an aluminum-magnesium co-doped cobalt carbonate precursor as well as a preparation method and application thereof. The preparation method comprises the following steps: respectively preparing a cobalt-aluminum mixed solution and a magnesium-containing precipitant solution; and adding the cobalt-aluminum mixed salt solution and the magnesium-containing precipitant solution into a base solution, and carrying out a co-precipitation reaction to obtain the aluminum-magnesium co-doped cobalt carbonate precursor. According to the method disclosed by the invention, the magnesium element is introduced into the precipitant solution in advance, so that magnesium ions can be complexed with the precipitant in advance, and the problems of nonuniform doping and segregation caused by difficult control of the precipitation rate of magnesium in the doping process are solved. According to the aluminum-magnesium co-doped cobalt carbonate precursor prepared by the method, magnesium and aluminum are uniformly doped, and the cycling stability of a lithium cobalt oxide battery can be effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries and relates to an aluminum-magnesium co-doped cobalt carbonate precursor and a preparation method and application thereof. Background Art

[0002] Lithium-ion batteries whose main component of positive electrode materials is lithium cobalt oxide are called lithium cobalt oxide batteries. They are mainly used in the 3C field due to their high energy density, good cycle and rate performance. As 3C digital products have increasing requirements for lithium-ion battery life and volume, there is an urgent need to increase the volume energy density of lithium cobalt oxide batteries by increasing the cut-off voltage.

[0003] As an important precursor for preparing lithium cobalt oxide positive electrode materials, cobalt oxide has various physical and chemical indicators that affect the performance of lithium cobalt oxide positive electrode materials and lithium cobalt oxide batteries. In the process of preparing cobalt oxide, cobalt carbonate is first prepared by liquid phase precipitation reaction, and then centrifugal washing, drying and calcination processes are carried out to obtain cobalt oxide. This process has the advantages of process controllability and easy synthesis, and is widely used in large-scale production.

[0004] In order to improve the cycle stability and volume energy density of lithium cobalt oxide batteries, it is usually necessary to dope or coat cobalt tetroxide in production to increase the cut-off voltage and improve the volume energy density of lithium cobalt oxide batteries.

[0005] As an example of coating treatment, aluminum and magnesium elements may be coated on the surface of cobalt tetroxide to improve the surface stability of the material. The conventional method is to coprecipitate and coat on cobalt carbonate, and then sinter to form cobalt tetroxide coated with aluminum oxide and magnesium oxide. CN112366302A discloses a method for preparing a coated cobalt tetroxide precursor, the preparation method comprising the following steps: (1) wet precipitation of cobalt tetroxide: cobalt salt solution, precipitant solution, and complexing agent solution are added to a reactor in parallel, the pH value and reaction temperature of the reaction system are controlled, and when the particle size of the obtained cobalt tetroxide particles reaches the set value, the reaction is stopped, and centrifugal washing and drying are performed; (2) the cobalt tetroxide obtained in step (1) is evenly dispersed in a metal salt solution and stirred, the metal salt solution is Al-containing. 3+ Or Mg 2+ (3) stopping the reaction, centrifugally washing, drying, and calcining to obtain coated cobalt tetroxide.

[0006] However, the precipitation rate of wet precipitation coating magnesium is difficult to control, and uneven doping is prone to occur. If dry coating is used, the cobalt oxide and the solid coating are mixed and sintered, which will also cause uneven coating.

[0007] As an example of doping treatment, aluminum can be added to cobalt tetroxide to stabilize the structure, improve cycle stability and thermal stability, and avoid irreversible phase changes in the structure during the charge and discharge process, which leads to collapse of the crystal structure. Magnesium can also be added to cobalt tetroxide to improve the disorder of cations and improve the high-voltage cycle performance of the material. Aluminum-magnesium synergistic doping can effectively improve the cycle performance of lithium cobalt oxide batteries at high voltages and effectively improve the volume energy density of lithium cobalt oxide batteries. CN118108265A discloses a method for preparing small-particle cobalt oxide for high-voltage lithium cobaltate, which includes the steps of preparing doped cobalt carbonate particles by liquid phase precipitation method using cobalt salt, ammonium bicarbonate and doping agent as raw materials, and the step of calcining doped cobalt carbonate particles to generate cobalt oxide, and its characteristics are: the steps of preparing doped cobalt carbonate particles by liquid phase precipitation method include the nucleation stage of aluminum-magnesium co-doping, the crystal nucleus growth stage of aluminum-magnesium co-doping and the shelling stage of nickel-manganese co-doping in sequence, wherein the aluminum / cobalt mass ratio in the nucleation stage is greater than the aluminum / cobalt mass ratio in the crystal nucleus growth stage, and the magnesium / cobalt mass ratio in the nucleation stage is less than the magnesium / cobalt mass ratio in the crystal nucleus growth stage. CN113716619A uses cobalt salt as raw material, carbonate as precipitant, soluble aluminum, magnesium, nickel, and manganese salts as doping sources, and controls the stable growth of cobalt carbonate particle size by accurately setting the rotation speed, flow rate and pH value of different feeding stages, avoiding the generation of small particles, and finally obtaining a large-particle spherical doped cobalt carbonate with uniform particle size distribution.

[0008] However, when common doping methods are used in precursor materials, the precipitation rate of magnesium is difficult to control, and segregation and even phase separation are prone to occur.

[0009] Therefore, providing a method to solve the phase separation problem caused by uneven doping and segregation during cobalt carbonate doping is a technical problem that needs to be solved urgently. Summary of the invention

[0010] In view of the above technical problems existing in the prior art, the object of the present invention is to provide an aluminum-magnesium co-doped cobalt carbonate precursor and a preparation method and application thereof.

[0011] To achieve the above object, the present invention adopts the following technical solutions:

[0012] In a first aspect, the present invention provides a method for preparing an aluminum-magnesium co-doped cobalt carbonate precursor, the preparation method comprising the following steps:

[0013] respectively preparing a cobalt-aluminum mixed solution and a magnesium-containing precipitant solution;

[0014] The cobalt-aluminum mixed salt solution and the magnesium-containing precipitant solution are added to the base solution to carry out a coprecipitation reaction to obtain an aluminum-magnesium co-doped cobalt carbonate precursor.

[0015] In the method of the present invention, since the magnesium element is introduced into the precipitant solution in advance, the magnesium ions can be pre-complexed with the precipitant, thereby solving the problem that the precipitation rate of magnesium is not well controlled during the doping process, thereby causing uneven doping and segregation. The aluminum-magnesium co-doped cobalt carbonate precursor prepared by the method of the present invention is uniformly doped with magnesium and aluminum, which can effectively improve the initial discharge capacity and cycle stability of the cobalt oxide lithium battery.

[0016] The method of the invention has low cost, simple operation and is convenient for industrial production.

[0017] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the technical objectives and beneficial effects of the present invention can be better achieved and realized.

[0018] Preferably, the cobalt-aluminum mixed solution includes Co element and Al element, and the concentration of Co element is 70g / L-110g / L, for example, it can be 70g / L, 75g / L, 80g / L, 85g / L, 90g / L, 95g / L, 100g / L, 105g / L or 110g / L, etc.; the concentration of Al element is 1.2g / L-2.0g / L, for example, it can be 1.2g / L, 1.3g / L, 1.4g / L, 1.5g / L, 1.6g / L, 1.8g / L or 2.0g / L, etc.

[0019] In one embodiment, the cobalt-aluminum mixed solution is prepared by dissolving a cobalt salt and an aluminum salt in a solvent to obtain a cobalt-aluminum mixed solution.

[0020] Preferably, the magnesium-containing precipitant solution includes magnesium element and precipitant, the precipitant includes ammonium bicarbonate, the concentration of Mg element is 0.5g / L-1.0g / L, for example, it can be 0.5g / L, 0.6g / L, 0.7g / L, 0.8g / L, 0.9g / L or 1.0g / L, etc.; the concentration of precipitant is 150g / L-250g / L, for example, it can be 150g / L, 155g / L, 160g / L, 165g / L, 170g / L, 175g / L, 180g / L, 185g / L, 190g / L, 200g / L, 205g / L, 210g / L, 215g / L, 220g / L, 225g / L, 230g / L, 235g / L, 240g / L, 245g / L or 250g / L, etc.

[0021] In one embodiment, the magnesium-containing precipitant solution is prepared by dissolving a magnesium salt and a precipitant in a solvent to obtain a magnesium-containing precipitant solution.

[0022] Preferably, the base liquid is a solution of ammonium bicarbonate, and the concentration of the base liquid is 10g / L-30g / L, for example, it can be 10g / L, 12g / L, 14g / L, 15g / L, 17g / L, 18g / L, 20g / L, 23g / L, 24g / L, 25g / L, 26g / L, 28g / L or 30g / L, etc.

[0023] Preferably, the cobalt-aluminum mixed salt solution and the magnesium-containing precipitant solution are added to the base liquid in parallel, and the flow rate of the cobalt-aluminum mixed salt solution is 8-20 L / h, for example, it can be 8 L / h, 10 L / h, 12 L / h, 14 L / h, 16 L / h, 18 L / h or 20 L / h, etc.; the flow rate of the magnesium-containing precipitant solution is 10-30 L / h, for example, it can be 10 L / h, 15 L / h, 20 L / h, 25 L / h or 30 L / h, etc.

[0024] Preferably, during the coprecipitation reaction, the stirring speed is 80rpm-200rpm, for example, it can be 80rpm, 90rpm, 100rpm, 110rpm, 120rpm, 130rpm, 140rpm, 150rpm, 160rpm, 170rpm, 180rpm, 190rpm or 200rpm, etc.

[0025] Preferably, the pH of the coprecipitation reaction is 7.0-7.6, for example, it can be 7.0, 7.1, 7.2, 7.3, 7.4, 7.5 or 7.6.

[0026] Preferably, the coprecipitation reaction temperature is 40°C-50°C, for example, 40°C, 42°C, 45°C, 47°C, 48°C or 50°C.

[0027] In a second aspect, the present invention provides an aluminum-magnesium co-doped cobalt carbonate precursor prepared by the preparation method described in the first aspect.

[0028] In a third aspect, the present invention provides an aluminum-magnesium co-doped cobalt oxide precursor, wherein the aluminum-magnesium co-doped cobalt oxide precursor is obtained by calcining the cobalt carbonate precursor described in the second aspect.

[0029] Preferably, the median particle size of the aluminum-magnesium co-doped cobalt oxide precursor is 12 μm-15 μm, for example, it can be 12 μm, 12.5 μm, 13 μm, 13.5 μm, 14 μm, 14.5 μm or 15 μm.

[0030] In a fourth aspect, the present invention provides a method for preparing the aluminum-magnesium co-doped cobalt tetroxide precursor as described in the third aspect, the preparation method comprising the following steps:

[0031] The aluminum-magnesium co-doped cobalt carbonate precursor described in the second aspect is calcined to obtain an aluminum-magnesium co-doped cobalt tetroxide precursor.

[0032] Preferably, the calcination temperature is 700°C-800°C, for example, it may be 700°C, 720°C, 730°C, 740°C, 750°C, 760°C, 775°C, 785°C or 800°C.

[0033] Preferably, a non-reducing gas is passed during the calcination process.

[0034] Preferably, the non-reducing gas includes at least one of air, nitrogen and argon.

[0035] Preferably, the flow rate of the non-reducing gas is 2 L / min-5 L / min, for example, it can be 2 L / min, 2.2 L / min, 2.4 L / min, 2.5 L / min, 2.7 L / min, 3 L / min, 3.3 L / min, 3.5 L / min, 3.8 L / min, 4 L / min, 4.3 L / min, 4.6 L / min or 5 L / min, etc.

[0036] In a fifth aspect, the present invention provides a lithium cobalt oxide, wherein the lithium cobalt oxide is prepared using the aluminum-magnesium co-doped cobalt oxide precursor described in the third aspect.

[0037] In a sixth aspect, the present invention provides a battery, wherein the battery comprises the lithium cobalt oxide described in the fifth aspect.

[0038] The numerical range described in the present invention not only includes the point values ​​listed above, but also includes any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] (1) The method of the present invention introduces magnesium into the precipitant solution in advance, so that magnesium ions can be complexed with the precipitant in advance, thereby solving the problem of uneven doping and segregation caused by poor control of the precipitation rate of magnesium during the doping process. The aluminum-magnesium co-doped cobalt carbonate precursor prepared by the method of the present invention has uniform magnesium and aluminum doping, which can effectively improve the initial discharge capacity and cycle stability of the cobalt oxide lithium battery.

[0041] (2) The method of the present invention is low-cost, simple to operate, and convenient for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 and Figure 2These are SEM images of the aluminum-magnesium co-doped cobalt oxide precursor of Example 1 at different magnifications. DETAILED DESCRIPTION

[0043] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0044] The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] Example 1

[0046] This embodiment provides a method for preparing an aluminum-magnesium co-doped cobalt carbonate precursor, the preparation method comprising the following steps:

[0047] (1) using cobalt aluminum metal salt to prepare a cobalt aluminum salt mixed solution, wherein the concentration of Co is 100 g / L and the concentration of Al is 1.3 g / L;

[0048] A magnesium-containing precipitant solution is prepared using magnesium metal salt and ammonium bicarbonate, wherein the concentration of Mg is 0.6 g / L and the concentration of ammonium bicarbonate is 200 g / L;

[0049] (2) Using an ammonium bicarbonate solution with a concentration of 20 g / L as the base liquid, the base liquid is added into a reactor, and a cobalt-aluminum mixed salt solution and a magnesium-containing precipitant solution are added into the base liquid. The flow rate of the cobalt-aluminum mixed salt solution is 10 L / h, and the flow rate of the magnesium-containing precipitant solution is 10 L / h. The mixture is stirred and mixed at a speed of 100 rpm, the pH is adjusted to 7.2, and the reaction temperature is controlled to 45° C. After the reaction is completed, an aluminum-magnesium co-doped cobalt carbonate slurry is obtained, which is washed and dried to obtain an aluminum-magnesium co-doped cobalt carbonate precursor.

[0050] This embodiment also provides an aluminum-magnesium co-doped cobalt tetroxide precursor, which is obtained by calcining the aluminum-magnesium co-doped cobalt carbonate precursor. The specific preparation method is:

[0051] The aluminum-magnesium co-doped cobalt carbonate precursor was placed in an atmosphere furnace at 750° C. for calcination. Nitrogen was introduced during the calcination process at a nitrogen flow rate of 3 L / min to obtain an aluminum-magnesium doped cobalt tetroxide precursor with a median particle size of 13 μm.

[0052] Figure 1 and Figure 2 These are SEM images of the aluminum-magnesium co-doped cobalt oxide precursor of Example 1 at different magnifications. It can be seen from the figure that the prepared cobalt carbonate particles have good sphericity, and the Al and Mg doping are relatively uniform without segregation problems.

[0053] Example 2

[0054] This embodiment provides a method for preparing an aluminum-magnesium co-doped cobalt carbonate precursor, the preparation method comprising the following steps:

[0055] (1) using cobalt aluminum metal salt to prepare a cobalt aluminum mixed salt solution, wherein the concentration of Co is 70 g / L and the concentration of Al is 1.5 g / L;

[0056] A magnesium-containing precipitant solution is prepared using magnesium metal salt and ammonium bicarbonate, wherein the concentration of Mg is 1.0 g / L and the concentration of ammonium bicarbonate is 150 g / L;

[0057] (2) Using an ammonium bicarbonate solution with a concentration of 15 g / L as the base liquid, the base liquid is added into a reactor, and a cobalt-aluminum mixed salt solution and a magnesium-containing precipitant solution are added into the base liquid. The flow rate of the cobalt-aluminum mixed salt solution is 15 L / h, and the flow rate of the magnesium-containing precipitant solution is 20 L / h. The mixture is stirred and mixed at a speed of 80 rpm, the pH is adjusted to 7.1, and the reaction temperature is controlled at 50° C. After the reaction is completed, an aluminum-magnesium co-doped cobalt carbonate slurry is obtained, which is washed and dried to obtain an aluminum-magnesium co-doped cobalt carbonate precursor.

[0058] This embodiment also provides an aluminum-magnesium co-doped cobalt tetroxide precursor, which is obtained by calcining the aluminum-magnesium co-doped cobalt carbonate precursor. The specific preparation method is:

[0059] The aluminum-magnesium co-doped cobalt carbonate precursor was placed in an atmosphere furnace at 800° C. for calcination. Nitrogen was introduced during the calcination process at a nitrogen flow rate of 5 L / min to obtain an aluminum-magnesium doped cobalt tetroxide precursor with a median particle size of 15 μm.

[0060] Example 3

[0061] This embodiment provides a method for preparing an aluminum-magnesium co-doped cobalt carbonate precursor, the preparation method comprising the following steps:

[0062] (1) using cobalt aluminum metal salt to prepare a cobalt aluminum mixed salt solution, wherein the concentration of Co is 110 g / L and the concentration of Al is 2.0 g / L;

[0063] A magnesium-containing precipitant solution is prepared using magnesium metal salt and ammonium bicarbonate, wherein the concentration of Mg is 0.8 g / L and the concentration of ammonium bicarbonate is 250 g / L;

[0064] (2) Using an ammonium bicarbonate solution with a concentration of 25 g / L as the base liquid, the base liquid is added into a reactor, and a cobalt-aluminum mixed salt solution and a magnesium-containing precipitant solution are added into the base liquid. The flow rate of the cobalt-aluminum mixed salt solution is 20 L / h, and the flow rate of the magnesium-containing precipitant solution is 30 L / h. The mixture is stirred and mixed at a speed of 200 rpm, the pH value is adjusted to 7.5, and the reaction temperature is controlled at 40° C. After the reaction is completed, an aluminum-magnesium co-doped cobalt carbonate slurry is obtained, which is washed and dried to obtain an aluminum-magnesium co-doped cobalt carbonate precursor.

[0065] This embodiment also provides an aluminum-magnesium co-doped cobalt tetroxide precursor, which is obtained by calcining the aluminum-magnesium co-doped cobalt carbonate precursor. The specific preparation method is:

[0066] The aluminum-magnesium co-doped cobalt carbonate precursor was placed in an atmosphere furnace at 700° C. for calcination. Nitrogen was introduced during the calcination process at a nitrogen flow rate of 2 L / min to obtain an aluminum-magnesium doped cobalt tetroxide precursor with a median particle size of 12 μm.

[0067] Example 4

[0068] The difference from Example 1 is that the concentration of Mg in the magnesium-containing precipitant solution is 0.3 g / L.

[0069] Example 5

[0070] The difference from Example 1 is that the concentration of Mg in the magnesium-containing precipitant solution is 1.2 g / L.

[0071] Comparative Example 1

[0072] The difference from Example 1 is that in the method for preparing the aluminum-magnesium co-doped cobalt carbonate precursor, magnesium is added during the stage of preparing the cobalt-aluminum mixed solution to prepare a cobalt-aluminum-magnesium mixed solution, and no magnesium metal salt is added during the preparation of the precipitant solution.

[0073] A lithium cobalt oxide positive electrode material is prepared by mixing the aluminum-magnesium co-doped cobalt oxide precursor of Examples 1-6 and Comparative Example 1 with lithium carbonate at a molar ratio of Li / Co of 1.05, and calcining at 850° C. for 10 hours to obtain a lithium cobalt oxide positive electrode material.

[0074] 85wt% of lithium cobalt oxide positive electrode material, 10wt% of Super-P and 5wt% of polyvinylidene fluoride (PVDF) are dispersed in N-methylpyrrolidone (NMP) solution to prepare positive electrode slurry, which is coated on aluminum foil and dried to obtain a positive electrode;

[0075] The lithium sheet is the negative electrode;

[0076] The separator is a PP microporous membrane (Celgard2400);

[0077] The composition of the electrolyte is: 1M LiPF6 (the solvent is a mixed solvent of EC, DMC and EMC, wherein the volume ratio of EC:DMC:EMC=1:1:1).

[0078] The positive electrode, separator, negative electrode and electrolyte are assembled to obtain a button battery.

[0079] Performance test: Cycle 500 times at room temperature, 2.4~4.2V voltage range, 1C rate, and record the first discharge specific capacity and the capacity retention rate after 500 cycles.

[0080] Table 1

[0081]

[0082]

[0083] It can be seen from Table 1 that the method of the present invention can improve the doping uniformity of magnesium and aluminum, so that the first discharge capacity and cycle stability of the battery are improved.

[0084] By comparing Example 1 with Examples 4-5, it can be seen that the concentration of the doped metal salt has a significant impact on the doping effect of the cobalt carbonate precursor, resulting in significant differences in the performance of the prepared lithium cobalt oxide batteries.

[0085] By comparing Example 1 with Comparative Example 1, it can be seen that the single doping of Mg metal causes its uneven distribution in the cobalt carbonate precursor, thereby resulting in a decrease in the performance of the lithium cobalt oxide battery.

[0086] The applicant declares that the present invention illustrates the detailed method of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed method, that is, it does not mean that the present invention must rely on the above-mentioned detailed method to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A method for preparing an aluminum-magnesium co-doped cobalt carbonate precursor, characterized in that: The preparation method comprises the following steps: respectively preparing a cobalt-aluminum mixed solution and a magnesium-containing precipitant solution; The cobalt-aluminum mixed salt solution and the magnesium-containing precipitant solution are added to the base solution to carry out a coprecipitation reaction to obtain an aluminum-magnesium co-doped cobalt carbonate precursor.

2. The preparation method according to claim 1, characterized in that: The cobalt-aluminum mixed solution includes Co and Al elements, wherein the concentration of the Co element is 70 g / L-110 g / L, and the concentration of the Al element is 1.2 g / L-2.0 g / L; Preferably, the magnesium-containing precipitant solution comprises magnesium element and precipitant, the precipitant comprises ammonium bicarbonate, the concentration of Mg element is 0.5 g / L-1.0 g / L, and the concentration of precipitant is 150 g / L-250 g / L; Preferably, the base liquid is a solution of ammonium bicarbonate, and the concentration of the base liquid is 10g / L-30g / L.

3. The preparation method according to claim 1 or 2, characterized in that: The cobalt-aluminum mixed salt solution and the magnesium-containing precipitant solution are added to the base liquid in a parallel flow manner, the flow rate of the cobalt-aluminum mixed salt solution is 8-20 L / h, and the flow rate of the magnesium-containing precipitant solution is 10-30 L / h.

4. The preparation method according to any one of claims 1 to 3, characterized in that During the coprecipitation reaction, the stirring speed is 80 rpm-200 rpm; Preferably, the pH of the coprecipitation reaction is 7.0-7.6; Preferably, the coprecipitation reaction temperature is 40°C-50°C.

5. An aluminum-magnesium co-doped cobalt carbonate precursor prepared by the preparation method according to any one of claims 1 to 4.

6. An aluminum-magnesium co-doped cobalt tetroxide precursor, characterized in that: The aluminum-magnesium co-doped cobalt oxide precursor is obtained by calcining the cobalt carbonate precursor according to claim 5; Preferably, the median particle size of the aluminum-magnesium co-doped cobalt oxide precursor is 12 μm-15 μm.

7. A method for preparing an aluminum-magnesium co-doped cobalt tetroxide precursor as claimed in claim 6, characterized in that: The preparation method comprises the following steps: The aluminum-magnesium co-doped cobalt carbonate precursor according to claim 5 is calcined to obtain an aluminum-magnesium co-doped cobalt tetroxide precursor.

8. The preparation method according to claim 7, characterized in that: The calcination temperature is 700°C-800°C; Preferably, a non-reducing gas is passed during the calcination process; Preferably, the non-reducing gas comprises at least one of air, nitrogen and argon; Preferably, the flow rate of the non-reducing gas is 2 L / min-5 L / min.

9. A lithium cobalt oxide, characterized in that: The lithium cobalt oxide is prepared using the aluminum-magnesium co-doped cobalt tetroxide precursor according to claim 6.

10. A battery, characterized in that: The battery comprises the lithium cobalt oxide according to claim 9.

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