阅读说明：本技术 无定型高掺铝氢氧化钴及其制备方法和应用 (Amorphous high-aluminum-doped cobalt hydroxide and preparation method and application thereof ) 是由 周明涛 訚硕 翁毅 王灯 周正 于 2021-09-30 设计创作，主要内容包括：本发明涉及锂离子电池技术领域,公开了无定型高掺铝氢氧化钴及其制备方法和应用。该无定型高掺铝氢氧化钴的化学式为：Co-(x)(OH)-(2)·Al-(y)(OH)-(3),其中,y为0.05-0.50,x+y＝1；所述氢氧化钴的颗粒形状为片状,且所述颗粒的宽为0.02μm-1.00μm,长为0.05μm-5.00μm。本发明提供的无定型高掺铝氢氧化钴具有铝掺杂量高且元素分布均匀、粒度分布集中、颗粒分散性好、压实密度高以及一次颗粒为片状的优点。(The invention relates to the technical field of lithium ion batteries, and discloses amorphous high-aluminum-doped cobalt hydroxide and a preparation method and application thereof. The chemical formula of the amorphous high aluminum-doped cobalt hydroxide is as follows: co x (OH) 2 ·Al y (OH) 3 Wherein y is 0.05-0.50, and x + y is 1; the particle shape of the cobalt hydroxide is sheet-shaped, and the width of the particle is 0.02-1.00 μm, and the length of the particle is 0.05-5.00 μm. The amorphous high aluminum-doped cobalt hydroxide provided by the invention has the advantages of high aluminum doping amount, uniform element distribution, concentrated particle size distribution, good particle dispersibility, high compaction density and flaky primary particles.)

1. An amorphous cobalt hydroxide with high aluminum content is characterized in that the chemical formula of the amorphous cobalt hydroxide with high aluminum content is as follows: co_x(OH)₂·Al_y(OH)₃Wherein y is 0.05-0.50, and x + y is 1; the particle shape of the cobalt hydroxide is sheet-shaped, and the width of the particle is 0.02-1.00 μm, and the length of the particle is 0.05-5.00 μm.

2. The amorphous highly aluminum-doped cobalt hydroxide according to claim 1, wherein Co in the amorphous highly aluminum-doped cobalt hydroxide³⁺And Co²⁺The content ratio is less than or equal to 1 wt%;

preferably, the particle size D of the cobalt hydroxide₅₀0.2-5.0 μm;

preferably, the particle size D of the cobalt hydroxide₁₀₀Is 1-10 μm;

preferably, the dispersion of the particle size distribution of the cobalt hydroxide is 4.00 to 8.00.

3. A method for preparing amorphous cobalt hydroxide highly doped with aluminum is characterized by comprising the following steps:

(1) in the presence of water I and under the protection of nitrogen, a cobalt source, an aluminum source, a reducing agent I and an alkali solution are contacted to carry out a synthesis reaction to obtain a mixture I;

(2) washing and drying the mixture I in sequence to obtain the amorphous high aluminum-doped cobalt hydroxide;

wherein the content of the nitrogen gas enables the oxygen content to be 1.0-3.0 wt% in the synthetic reaction process, and the pH value in the synthetic reaction process is controlled to be 11.50-14.00.

4. The method of claim 3, wherein in step (1), the method further comprises:

(i) mixing the water I, the reducing agent I and the alkali solution I to obtain a mixture II; OH in the mixture II^-The concentration of (A) is 4.90-5.40 mol/L;

(ii) contacting the mixture II, the cobalt source, the aluminum source and an alkali solution II to perform the synthesis reaction to obtain a mixture I;

wherein the alkali solution consists of the alkali solution I and the alkali solution II, and the volume ratio of the used amount of the alkali solution I to the used amount of the alkali solution II is 1: 1.21-1.44.

5. The process according to claim 4, wherein in step (I), the water I, the reducing agent I and the alkali solution I are used in a volume ratio of 100: 0.045-0.055: 80-120 parts of;

preferably, the volume ratio of the cobalt source, the aluminum source and the alkali solution II is 1: 1: 0.35-0.50.

6. The method according to any one of claims 3 to 5, wherein, in the step (1), the cobalt source is selected from at least one of sulfate, nitrate and chloride containing cobalt element;

preferably, in the step (1), the aluminum source is at least one selected from sulfate, nitrate and chloride containing aluminum element;

preferably, in step (1), the reducing agent I is selected from at least one of hydrazine hydrate, sodium borohydride and carbohydrazide;

preferably, in the step (1), the alkali solution is at least one selected from sodium hydroxide and potassium hydroxide;

preferably, in step (1), the conditions of the synthesis reaction at least satisfy: under the condition of stirring, the rotating speed is more than or equal to 500rpm, the temperature is 35-55 ℃, and the time is 3-5 h.

7. The method according to any one of claims 3 to 6, wherein, in step (2), the step of washing comprises:

in the presence of water II, carrying out centrifugal washing on the mixture I and a reducing agent II, wherein the centrifugal washing condition at least satisfies the following conditions: the rotating speed is 850-;

preferably, in the step (2), the volume ratio of the water II, the mixture I and the reducing agent II is 1: 0.15-0.30: 3.50-5.00;

preferably, in step (2), the reducing agent II is selected from at least one of hydrazine hydrate, sodium borohydride, carbohydrazide, vitamin C.

8. The method according to any one of claims 3 to 7, wherein in step (2), the drying conditions at least satisfy: the time is 15-20h, the temperature is 100-.

9. Amorphous highly aluminium-doped cobalt hydroxide obtainable by the process according to any one of claims 3 to 8.

10. Use of amorphous highly aluminium-doped cobalt hydroxide according to any one of claims 1-2 and 9 in the preparation of a lithium ion battery.

Technical Field

The invention relates to the technical field of lithium ion batteries, in particular to amorphous high-aluminum-doped cobalt hydroxide and a preparation method and application thereof.

Background

In this century, modern industries and communication industries have rapidly developed, and the demand for energy is increasing day by day. Compared with the more serious environmental problem caused by the traditional energy, the electric energy as one of the new energy has good environmental friendliness, and the lithium ion battery is widely applied to various mobile devices. For the existing communication and intelligent wearable equipment, the lithium cobaltate battery is widely applied.

Nowadays, electronic devices such as 3C digital devices have increasingly high requirements on the capacity, cycle life, stability, safety and other properties of batteries, and thus, the requirements on lithium cobaltate are also increasingly stringent. The cobaltosic oxide is one of the precursors for preparing the lithium cobaltate, and the physicochemical index and the quality performance of the cobaltosic oxide have very important influence on the performance of the final lithium cobaltate.

At the present stage, most of lithium cobaltate is prepared by preparing a high-aluminum-doped cobalt carbonate sample through a wet-process carbonic acid system and then sintering the high-aluminum-doped cobalt carbonate sample into cobaltosic oxide, but the cobaltosic oxide prepared by the method has the problems of low compaction density, non-uniform doping elements and the like, so that the performance of the synthesized lithium cobaltate is unstable, and the capacity and the cycle performance of a final battery are reduced.

The beta-cobalt hydroxide has low price and is environment-friendly, and is an important electrochemical active material. For example, when the beta-cobalt hydroxide is used as a supercapacitor electrode, the beta-cobalt hydroxide has a theoretical specific capacity of 3670F/g, and can be used as a precursor for preparing various traditional cobalt metal oxides, sulfides and potassium cobaltate materials for potassium ion batteries, and the beta-cobalt hydroxide plays an important role in the industrial chain of series material preparation.

Cobalt hydroxide is used as an electrode active substance, the problems of substance conversion damage and stability reduction exist in the chemical reaction process, and the stability of the beta-cobalt hydroxide material doped with a certain amount of Al element can be well improved.

However, the amount of aluminum doped in the cobalt hydroxide material prepared at present is relatively low, and therefore, it is necessary to provide a cobalt hydroxide material with high aluminum doping.

Disclosure of Invention

The invention aims to overcome the defect of low aluminum doping amount of the cobalt hydroxide material in the prior art.

In order to achieve the above object, a first aspect of the present invention provides an amorphous highly aluminum-doped cobalt hydroxide, which has a chemical formula: co_x(OH)₂·Al_y(OH)₃Wherein y is 0.05-0.50, and x + y is 1; the particle shape of the cobalt hydroxide is sheet-shaped, and the width of the particle is 0.02-1.00 μm, and the length of the particle is 0.05-5.00 μm.

In a second aspect, the present invention provides a method for preparing amorphous highly aluminum-doped cobalt hydroxide, which comprises:

(1) in the presence of water I and under the protection of nitrogen, a cobalt source, an aluminum source, a reducing agent I and an alkali solution are contacted to carry out a synthesis reaction to obtain a mixture I;

(2) washing and drying the mixture I in sequence to obtain the amorphous high aluminum-doped cobalt hydroxide;

wherein the content of the nitrogen gas enables the oxygen content to be 1.0-3.0 wt% in the synthetic reaction process, and the pH value in the synthetic reaction process is controlled to be 11.50-14.00.

A third aspect of the present invention provides an amorphous highly aluminum-doped cobalt hydroxide prepared by the method described in the first aspect.

A fourth aspect of the present invention provides a use of the amorphous highly aluminum-doped cobalt hydroxide described in the first aspect and/or the third aspect in the preparation of a lithium ion battery.

The amorphous high aluminum-doped cobalt hydroxide provided by the invention has the advantages of high aluminum doping amount, uniform element distribution, concentrated particle size distribution, good particle dispersibility, high compaction density and flaky primary particles.

The method for preparing the amorphous high aluminum-doped cobalt hydroxide provided by the invention at least has the following advantages:

(1) the amorphous high aluminum-doped cobalt hydroxide particles prepared by the method provided by the invention are flaky and have better dispersibility, so that the uniformity of mixing Li in the LCO material prepared at the rear end is improved.

(2) The amorphous high aluminum-doped cobalt hydroxide particles prepared by the method provided by the invention have high aluminum doping amount and uniform distribution, and the particles have larger contact area and surface activity, so that the platform voltage and the conductivity of the LCO material are favorably improved.

(3) The content of trivalent cobalt in the amorphous high-aluminum-doped cobalt hydroxide particles prepared by the method provided by the invention is extremely low, so that the improvement of the cycle performance of the LCO material is facilitated.

(4) The method provided by the invention has the advantages of few process steps, high production efficiency and environmental friendliness.

Other features and advantages of the present invention will be described in detail in the following detailed description.

Drawings

FIG. 1 is an SEM image of amorphous highly aluminum-doped cobalt hydroxide G1 in preferred example 1 of the present invention; FIG. 1 is a left SEM picture of amorphous highly aluminum-doped cobalt hydroxide G1 at a magnification of 20.0K, and FIG. 1 is a right SEM picture of amorphous highly aluminum-doped cobalt hydroxide G1 at a magnification of 10.0K;

FIG. 2 is an SEM image of amorphous highly aluminum-doped cobalt hydroxide DG1 in comparative example 1 of the present invention; FIG. 2 is a left SEM photograph of the amorphous highly aluminum-doped cobalt hydroxide DG1 at a magnification of 3.000K, and a right SEM photograph of the amorphous highly aluminum-doped cobalt hydroxide DG1 at a magnification of 10.000K;

FIG. 3 is an XRD pattern of amorphous highly aluminum-doped cobalt hydroxide G1 in preferred example 1 of the present invention;

FIG. 4 is an EDS mapping chart of amorphous highly aluminum-doped cobalt hydroxide G1 in preferred example 1 of the present invention; FIG. 4a is an EDS profile of amorphous highly aluminum-doped cobalt hydroxide G1, FIG. 4b is an O element profile of amorphous highly aluminum-doped cobalt hydroxide G1, FIG. 4c is an Al element profile of amorphous highly aluminum-doped cobalt hydroxide G1, and FIG. 4d is a Co element profile of amorphous highly aluminum-doped cobalt hydroxide G1;

FIG. 5 is an XPS energy spectrum of amorphous highly aluminum-doped cobalt hydroxide G1 in preferred example 1 of the present invention.

Detailed Description

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as particularly advantageous herein.

In the present invention, the particle size D is defined as₅₀Refers to the corresponding particle size when the cumulative percentage of particle size distribution reaches 50%. Particle size D₁₀₀Particle size D₉₀Particle size D₁₀Having a particle size D₅₀Similar definitions will not be repeated here.

In the present invention, the dispersion of the particle size distribution means (D)₉₀-D₁₀)/D₅₀The value of (c).

As mentioned above, the first aspect of the present invention provides an amorphous highly aluminum-doped cobalt hydroxide, which has the chemical formula: co_x(OH)₂·Al_y(OH)₃Wherein y is 0.05-0.50, and x + y is 1; the particle shape of the cobalt hydroxide is sheet-shaped, and the width of the particle is 0.02-1 μm, and the length of the particle is 0.05-5 μm.

Preferably, Co in the amorphous high aluminum-doped cobalt hydroxide³⁺And Co²⁺The content ratio is less than or equal to 1 wt%.

Preferably, the particle size D of the cobalt hydroxide₅₀0.2-5.0 μm;

preferably, the particle size D of the cobalt hydroxide₁₀₀Is 1-10 μm;

preferably, the dispersion of the particle size distribution of the cobalt hydroxide is 4.00 to 8.00.

As previously mentioned, a second aspect of the present invention provides a method for preparing amorphous highly aluminum-doped cobalt hydroxide, comprising:

(1) in the presence of water I and under the protection of nitrogen, a cobalt source, an aluminum source, a reducing agent I and an alkali solution are contacted to carry out a synthesis reaction to obtain a mixture I;

(2) washing and drying the mixture I in sequence to obtain the amorphous high aluminum-doped cobalt hydroxide;

wherein the content of the nitrogen gas enables the oxygen content to be 1.0-3.0 wt% in the synthetic reaction process, and the pH value in the synthetic reaction process is controlled to be 11.50-14.00.

According to a preferred embodiment, in step (1), the method further comprises:

(i) mixing the water I, the reducing agent I and the alkali solution I to obtain a mixture II; OH in the mixture II^-The concentration of (A) is 4.90-5.40 mol/L;

(ii) contacting the mixture II, the cobalt source, the aluminum source and an alkali solution II to perform the synthesis reaction to obtain a mixture I;

wherein the alkali solution consists of the alkali solution I and the alkali solution II, and the volume ratio of the used amount of the alkali solution I to the used amount of the alkali solution II is 1: 1.21-1.44.

It should be noted that the method of mixing is not particularly limited, and those skilled in the art can select the mixing method according to the known technical means in the field. Illustratively, the mixing conditions may be: under the condition of stirring, the rotating speed is more than or equal to 500rpm, the temperature is 35-55 ℃, and the time is 3-5 h.

It should be noted that the concentrations of the alkali solution I and the alkali solution II are not particularly limited in the present invention, and those skilled in the art can select them according to the technical means known in the art, but in order to obtain amorphous cobalt hydroxide with higher aluminum content, more uniform distribution and fine grains, the present invention exemplarily provides a preferred embodiment, and those skilled in the art should not be construed as limiting the present invention. Preferably, the concentration of the alkali solution I is 30-34 wt%, and the concentration of the alkali solution II is 15-20 wt%.

Preferably, in step (I), the volume ratio of the water I, the reducing agent I and the alkali solution I is 100: 0.045-0.055: 80-120.

Preferably, the volume ratio of the cobalt source, the aluminum source and the alkali solution II is 1: 1: 0.35-0.50. The inventor of the invention finds that under the preferable condition, the prepared amorphous cobalt hydroxide with high aluminum doping has higher doping uniformity and fine primary crystal grains.

It should be noted that the ion concentration in the cobalt source and the aluminum source is not particularly limited in the present invention, and those skilled in the art can select the ion concentration according to the technical means known in the art, but in order to obtain amorphous cobalt hydroxide with higher aluminum content, better and uniform distribution, and fine crystal grains, the present invention exemplarily provides a preferred embodiment, and those skilled in the art should not be construed as limiting the present invention. Preferably, the cobalt ion concentration of the cobalt source is 50.0-120.0g/L, more preferably 100.0-120.0 g/L; the aluminum ion concentration of the aluminum source is 2.41-54.98 g/L.

Preferably, in the step (1), the cobalt source is at least one selected from the group consisting of a sulfate, a nitrate and a chloride containing cobalt. Illustratively, the cobalt source may be cobalt chloride, cobalt sulfate, cobalt nitrate. In the present invention, the cobalt source is preferably cobalt chloride.

Preferably, in the step (1), the aluminum source is at least one selected from sulfates, nitrates and chlorides containing an aluminum element. Illustratively, the aluminum source may be aluminum sulfate, aluminum nitrate, aluminum chloride.

Preferably, in step (1), the reducing agent I is selected from at least one of hydrazine hydrate, sodium borohydride and carbohydrazide.

Preferably, in the step (1), the alkali solution is at least one selected from sodium hydroxide and potassium hydroxide.

Preferably, in step (1), the synthesis reaction conditions at least satisfy: under the condition of stirring, the rotating speed is more than or equal to 500rpm, the temperature is 35-55 ℃, and the time is 3-5 h.

More preferably, in step (1), the conditions of the synthesis reaction at least satisfy: the process is carried out under the condition of stirring, and the rotating speed is more than 850 r/min; the temperature is 40-50 ℃ and the time is 3-5 h. The inventor of the invention finds that under the preferable condition, the prepared amorphous high aluminum-doped cobalt hydroxide has better dispersibility and fine primary crystal grains.

It should be noted that the method for washing and drying is not particularly limited, and those skilled in the art can select the method according to the technical means known in the art, but the preferred embodiment is exemplarily provided hereinafter in order to obtain the amorphous cobalt hydroxide with dispersed particles and fine grains, and those skilled in the art should not be construed as limiting the invention.

According to another preferred embodiment, in the step (2), the step of washing includes:

in the presence of water II, carrying out centrifugal washing on the mixture I and a reducing agent II, wherein the centrifugal washing condition at least satisfies the following conditions: the rotation speed is 850-.

Preferably, in the step (2), the volume ratio of the water II, the mixture I and the reducing agent II is 1: 0.15-0.30: 3.50-5.00.

Preferably, in step (2), the reducing agent II is selected from at least one of hydrazine hydrate, sodium borohydride, carbohydrazide, vitamin C. More preferably, the reducing agent II is vitamin C.

Preferably, in the step (2), the drying condition at least satisfies: the time is 15-20h, the temperature is 100-.

As mentioned above, the third aspect of the present invention provides an amorphous highly aluminum-doped cobalt hydroxide prepared by the method described in the first aspect.

As mentioned above, the fourth aspect of the present invention provides a use of the amorphous highly aluminum-doped cobalt hydroxide described in the first aspect and/or the third aspect in the preparation of a lithium ion battery.

The present invention will be described in detail below by way of examples. In the following examples, all the raw materials used are commercially available ones unless otherwise specified.

Nitrogen gas: the purity is more than or equal to 99.999 percent, and the nitrogen making machine can produce the nitrogen by itself.

Water: deionized water.

Hydrazine hydrate: analytically pure, purchased from Shandong De Sha International trade Co.

Sodium hydroxide: the product is commercially pure and is purchased from Wuhanxin Wanwei chemical Co.

Cobalt chloride: commercially pure, available from Huayou Co of Zhejiang province, Ltd.

Aluminum sulfate: the industrial purity is purchased from Shandong Landing New energy science and technology GmbH.

Vitamin C: is of industrial purity and is purchased from Zhengzhou Dewang chemical products Co.

Example 1: preparation of amorphous highly aluminum-doped cobalt hydroxide

(1)

(i) Under the protection of nitrogen, water I, hydrazine hydrate (namely reducing agent I) and 32 wt% of sodium hydroxide solution (namely alkali solution I) are mixed to obtain OH^-Mixture II with a concentration of 5.12 mol/L;

in the course of the mixing, the mixing is carried out,

the dosage of the water I is 12L, the dosage of the hydrazine hydrate is 0.006L, and the dosage of the sodium hydroxide solution is 11L;

the mixing speed is 900rpm, the temperature is 42 ℃, and the time is 3 h;

(ii) under the protection of nitrogen, carrying out a synthesis reaction on the mixture II, a cobalt chloride solution (namely a cobalt source) with the cobalt ion concentration of 101.7g/L, an aluminum sulfate solution (namely an aluminum source) with the aluminum ion concentration of 8.20g/L and a sodium hydroxide solution (namely an alkali solution II) with the weight percent of 18 to obtain a mixture I with the pH value of 12.50;

in the course of the synthesis reaction described above,

the using amount of the mixture II is 24L, the using amount of the cobalt chloride solution is 36L, the using amount of the aluminum sulfate solution is 36L, and the using amount of the sodium hydroxide solution is 14.4L;

the rotating speed of the synthesis reaction is 900rpm, the temperature is 42 ℃, the time is 3 hours, and the oxygen content is 1.3 wt;

(2)

centrifugally washing and dehydrating the mixture I, water II and 0.12g/L vitamin C aqueous solution (namely a reducing agent II), and drying in a vacuum oven to obtain the amorphous cobalt hydroxide with high aluminum content; crushing the amorphous cobalt hydroxide with high aluminum content by using a disc nest mill to obtain powdery amorphous cobalt hydroxide G1 with high aluminum content;

in the centrifugal washing, in the washing step,

the dosage of the mixture I is 100L, the dosage of the water II is 500L, and the dosage of the vitamin C aqueous solution is 2000L;

the rotation speed of centrifugal washing is 1020rpm, and the time is 2 h;

in the drying, the temperature is 120 ℃, the time is 20 hours, and the water content of the amorphous cobalt hydroxide with high aluminum content after drying is 20.51 wt.

Examples 2 to 3

Examples 2-3 were carried out using the same procedure as in example 1, except that: the amounts of raw materials and process parameters were varied and are specifically shown in table 1.

And respectively preparing powdery amorphous high aluminum-doped cobalt hydroxide G2 and G3.

Example 4

This example was carried out using the same procedure as in example 1, except that: the volume ratio of the cobalt source to the aluminum source to the alkali solution II is 1: 1: 0.60, and the remaining parameters were the same as in example 1, amorphous highly aluminum-doped cobalt hydroxide G4 was prepared as a powder, as shown in table 1.

Example 5

This example was carried out using the same procedure as in example 1, except that: the rotational speed of the synthesis reaction was 600rpm, and the rest parameters were the same as those in example 1, to prepare amorphous highly aluminum-doped cobalt hydroxide G5 in powder form, as shown in Table 1.

Comparative example 1

This comparative example was carried out using the same procedure as example 1, except that: the oxygen content during the synthesis reaction was 5.0 wt%, and the remaining conditions were the same as in example 1, to prepare amorphous highly aluminum-doped cobalt hydroxide DG1 in powder form, as shown in Table 1.

Comparative example 2

This comparative example was carried out using the same procedure as example 1, except that: the pH during the synthesis reaction was 11.08, and the rest of the conditions were the same as in example 1, to prepare amorphous highly aluminum-doped cobalt hydroxide DG2 in powder form, as shown in table 1.

Test example 1

The powdery amorphous high aluminum-doped cobalt hydroxide prepared in the examples and the comparative examples is subjected to EDTA titration to determine the aluminum doping amount, 1C circulation to determine the 50C capacity retention rate and XPS to determine Co³⁺/Co²⁺The value of (c).

FIG. 1 of the present invention shows an SEM image of amorphous highly aluminum-doped cobalt hydroxide G1 in example 1; wherein, the left figure of fig. 1 is an SEM image of amorphous highly aluminum-doped cobalt hydroxide G1 with a magnification of 20.0K, and the right figure of fig. 1 is an SEM image of amorphous highly aluminum-doped cobalt hydroxide G1 with a magnification of 10.0K. As can be seen from FIG. 1, the amorphous highly aluminum-doped cobalt hydroxide G1 provided by the invention has fine crystal grains, thin hexagonal primary particles, high crystallinity and good particle dispersibility.

FIG. 2 of the present invention shows an SEM image of amorphous highly aluminum-doped cobalt hydroxide DG1 in comparative example 1; the left image of FIG. 2 is the SEM image of the amorphous highly aluminum-doped cobalt hydroxide DG1 with the magnification of 3.000K, and the right image of FIG. 2 is the SEM image of the amorphous highly aluminum-doped cobalt hydroxide DG1 with the magnification of 10.000K. As can be seen from FIG. 2, the amorphous highly aluminum-doped cobalt hydroxide DG1 provided by the invention has the advantages that the primary particles are flaky due to excessive oxidation, the material agglomeration is serious, and the particle dispersibility is poor.

Figure 3 of the present invention shows the XRD pattern of amorphous highly aluminum-doped cobalt hydroxide G1 in example 1. As can be seen from FIG. 3, the amorphous highly aluminum-doped cobalt hydroxide G1 provided by the invention has the advantages of obvious characteristic peak, high strength of the characteristic peak, high particle crystallinity, low signal-to-noise ratio and less impurity peaks, and the preparation method provided by the invention can be used for obtaining the amorphous highly aluminum-doped cobalt hydroxide with high crystallinity and purity.

Figure 4 of the present invention shows the EDS mapping plot of amorphous highly aluminum-doped cobalt hydroxide G1 in example 1. FIG. 4a is an EDS profile of amorphous highly aluminum-doped cobalt hydroxide G1, FIG. 4b is an O element profile of amorphous highly aluminum-doped cobalt hydroxide G1, FIG. 4c is an Al element profile of amorphous highly aluminum-doped cobalt hydroxide G1, and FIG. 4d is a Co element profile of amorphous highly aluminum-doped cobalt hydroxide G1. As can be seen from FIG. 4, Al as a doping element is uniformly distributed in the particles, which indicates that the preparation method provided by the invention can be suitable for preparing amorphous cobalt hydroxide with high aluminum content.

Figure 5 of the present invention shows the XPS energy spectrum of amorphous highly aluminum-doped cobalt hydroxide G1 in example 1. Co can be obtained by calculating the peak area from FIG. 5³⁺/Co²⁺Is 0.005.

TABLE 1

TABLE 2

As can be seen from the results in Table 2, the amorphous cobalt hydroxide with high aluminum content prepared by the method provided by the invention has the advantages of good dispersibility, high aluminum content and uniform distribution, and the content of trivalent cobalt in the cobalt hydroxide is extremely low.

The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.