Method for mixing and coating electrolytic manganese dioxide, electrolytic manganese dioxide and application of electrolytic manganese dioxide

Abstract

The invention discloses a method for mixing and coating electrolytic manganese dioxide, the electrolytic manganese dioxide and application of the electrolytic manganese dioxide, and belongs to the technical field of positive electrode materials for zinc-manganese batteries, the method for mixing and coating the electrolytic manganese dioxide comprises the following steps: S1, performing plasma activation pretreatment on electrolytic manganese dioxide powder; s2, nano additive dispersion liquid is prepared, the nano additive dispersion liquid comprises a nano additive and an anionic surfactant, the nano additive comprises nano TiO2, and the anionic surfactant comprises sodium dodecyl benzene sulfonate and sodium polyacrylate; s3, coating the pretreated electrolytic manganese dioxide powder with the nano additive dispersion liquid to obtain a coated material; and S4, drying and crushing the coated material. The nano additive coating layer on the surface improves the activity of the electrolytic manganese dioxide, so that the electrolytic manganese dioxide has excellent electrochemical performance in the zinc-manganese battery, the discharge capacity of the battery can be improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of positive electrode materials for zinc-manganese batteries, and in particular to a method for mixing and coating electrolytic manganese dioxide, electrolytic manganese dioxide, and applications thereof. Background Art

[0002] The overall industrialization of high-performance electrolytic manganese dioxide (EMD) with a coating containing a discharge-modifying additive faces numerous technical challenges. Directly incorporating the additive into the EMD during the electrolysis process results in significant material waste, along with challenges such as difficulty collecting and disposing of the additive and wastewater, and difficulty determining the EMD's crystal structure and coating form. Furthermore, in post-processing, when liquid-phase blending is employed, the timing and stability of the blending are often difficult to accurately determine. Furthermore, when the discharge-modifying additive is directly incorporated into the powder using a high-pressure mixer through a dry process, powder agglomeration and mixing uniformity are difficult to address. Summary of the Invention

[0003] The present application is made in view of the above problems, and its purpose is to provide a method for mixing and coating electrolytic manganese dioxide, electrolytic manganese dioxide and its application. The present invention innovatively develops a method for preparing EMD by oblique mixing wet method of nano-scale additive mixing and coating. This process can effectively achieve uniform coating of materials, thereby overcoming many difficulties in traditional methods.

[0004] Specifically, the first aspect of the present application provides a method for mixing and coating electrolytic manganese dioxide, comprising the following steps: S1: Plasma activation pretreatment of electrolytic manganese dioxide powder; S2: preparing a nano-additive dispersion, wherein the nano-additive dispersion comprises a nano-additive and an anionic surfactant, wherein the nano-additive comprises nano-TiO2, and the anionic surfactant comprises sodium dodecylbenzene sulfonate and sodium polyacrylate; S3: coating the electrolytic manganese dioxide powder after the plasma activation pretreatment in step S1 with the nano-additive dispersion to obtain a coated material; S4: Dry and sieve the coated material.

[0005] Furthermore, the plasma activation pretreatment in step S1 is to feed the raw material electrolytic manganese dioxide powder into a plasma treatment device and treat it at a power of 50-200W for 1-5 minutes in an Ar / O2 mixed atmosphere.

[0006] Furthermore, the preparation method of the nano-additive dispersion described in step S2 is: pre-mixing nano-TiO2 and deionized water, and then adding sodium dodecylbenzene sulfonate and sodium polyacrylate, wherein the volume ratio of sodium dodecylbenzene sulfonate to sodium polyacrylate is 2:1-1:2.

[0007] Furthermore, the preparation method of the nano-additive dispersion further comprises performing ultrasonic dispersion in three stages: The first stage has an ultrasound frequency of 20-30 kHz and a duration of 5-8 minutes; and / or The second stage has an ultrasound frequency of 40-50kHz and a duration of 10-12 minutes; and / or The third stage ultrasound frequency is 25-30kHz and the duration is 5-8min.

[0008] Furthermore, in step S3, coating the electrolytic manganese dioxide powder with the nano-additive dispersion includes adjusting the pH of the nano-additive dispersion to 6.0-7.5 using a pH regulator, and a low-speed mixing stage and a high shear stage, wherein the speed of the low-speed mixing stage is 30-40 rpm and the time is 2-2.5 h; and / or the speed of the high shear stage is 120-150 rpm and the time is 1-1.5 h.

[0009] Furthermore, the low-speed mixing stage and the high-shear stage are carried out by zirconia ball milling; and / or the ball-to-material ratio is 1-1.5:1; and / or The low-speed mixing stage and the high-shear stage were carried out in a N2 atmosphere.

[0010] Furthermore, the drying in step S4 is performed by fluidized bed drying, and the slurry in step S3 is sprayed into the fluidized bed through a centrifugal atomizer at a rotation speed of 18000-20000 rpm, with an inlet temperature of 80°C, an outlet temperature of 40°C, and a drying time of 8-20 minutes.

[0011] Furthermore, the pulverization in step S4 is performed by using a supersonic airflow pulverizer with a pulverization pressure of 0.8-0.9 MPa, and the particles after pulverization are 20 μm≤D50≤45 μm; and / or The method also includes screening. Before screening, 0.1-0.2% dodecyltrimethylammonium bromide solution is sprayed to simultaneously complete the surface hydrophilic modification. The screening mesh number is 400 meshes.

[0012] The second aspect of the present invention provides an electrolytic manganese dioxide prepared by the above-mentioned method of mixing and coating electrolytic manganese dioxide.

[0013] The third aspect of the present invention provides a use of the electrolytic manganese dioxide in the positive electrode material of alkaline zinc-manganese batteries.

[0014] The present invention has the following beneficial effects: The method for blending and coating electrolytic manganese dioxide of the present invention comprises the following steps: the plasma activation pretreatment described in step S1, which involves plasma treatment in an Ar / O2 mixed atmosphere, enhances the surface activity of the electrolytic manganese dioxide powder, providing more favorable conditions for subsequent coating with nano-additives. This pretreatment not only improves coating efficiency but also ensures the uniformity and stability of the coating layer. In step S2, a carefully designed nano-additive dispersion preparation process utilizes sodium dodecylbenzenesulfonate and sodium polyacrylate, which exhibit excellent dispersibility and synergistically enhance the dispersion stability of nano-TiO2, ensuring uniform dispersion of the nano-TiO2 in the dispersion, which is crucial for the subsequent coating process. The three-stage ultrasonic dispersion further optimizes the dispersion of the nano-additives and improves the uniformity and density of the coating layer. The coating process in step S3 utilizes a combination of low-speed mixing and high shear, ensuring sufficient contact between the nano-additives and the electrolytic manganese dioxide powder and achieving uniform coating of the nano-additives on the powder surface. Furthermore, the coating process employs zirconia ball milling and an N2 atmosphere, further improving the coating efficiency and stability of the coating layer. The drying and pulverization process in step S4 utilizes advanced fluidized bed drying technology and a supersonic airflow mill, ensuring rapid drying of the coated material and uniformity of the pulverized particles. Furthermore, surface hydrophilic modification by spraying with a dodecyltrimethylammonium bromide solution enhances the hydrophilic properties of the electrolytic manganese dioxide, further improving its application as a cathode material for alkaline zinc-manganese batteries.

[0015] Compared to traditional methods, the present invention has simple process steps, is easy to operate, and can achieve large-scale industrial production, reducing production costs. Furthermore, the blended and coated electrolytic manganese dioxide of the present invention exhibits excellent electrochemical performance in zinc-manganese batteries, increasing the battery's discharge capacity and extending its service life. Therefore, the present invention has broad application prospects in the field of positive electrode materials for zinc-manganese batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 This is an electron microscope image of nano-titanium dioxide; Figure 2 The electron microscope of titanium dioxide mixed with electrolytic manganese dioxide in Example 1 Figure 1 ; Figure 3The electron microscope of titanium dioxide mixed with electrolytic manganese dioxide in Example 1 Figure 2 ; Figure 4 The EDS of titanium dioxide mixed with electrolytic manganese dioxide in Example 1 Figure 1 ; Figure 5 The EDS of titanium dioxide mixed with electrolytic manganese dioxide in Example 1 Figure 2 ; Figure 6 The EDS of titanium dioxide mixed with electrolytic manganese dioxide in Example 1 Figure 3 ; Figure 7 Graph showing the discharge performance test results of Example 1 and Comparative Example 1.

[0018] The purpose, features and advantages of this drawing will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is described and illustrated below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are merely used to explain this application and are not intended to limit this application. Based on the embodiments provided in this application, all other embodiments obtained by those of ordinary skill in the art without making any creative work are within the scope of protection of this application.

[0020] Obviously, the following descriptions are merely some examples or embodiments of the present application. Those skilled in the art can apply the present application to other similar scenarios without inventive effort. Furthermore, it is also understood that, although the effort involved in such a development process may be complex and lengthy, for those skilled in the art related to the content disclosed in the present application, changes in design, manufacturing, or production based on the technical content disclosed in the present application are merely conventional technical means and should not be construed as an insufficiency of the content disclosed in the present application.

[0021] An embodiment of the first aspect of the present invention provides a method for blending and coating electrolytic manganese dioxide, comprising the following steps: S1: Plasma activation pretreatment of electrolytic manganese dioxide powder; S2: preparing a nano-additive dispersion, wherein the nano-additive dispersion comprises a nano-additive and an anionic surfactant, wherein the nano-additive comprises nano-TiO2, and the anionic surfactant comprises sodium dodecylbenzene sulfonate and sodium polyacrylate; S3: coating the electrolytic manganese dioxide powder after the plasma activation pretreatment in step S1 with the nano-additive dispersion to obtain a coated material; S4: Dry and sieve the coated material.

[0022] The method for blending and coating electrolytic manganese dioxide of the present invention comprises the following steps: the plasma activation pretreatment described in step S1, which is carried out by plasma treatment in an Ar / O2 mixed atmosphere, can enhance the activity of the surface of the electrolytic manganese dioxide powder, thereby providing more favorable conditions for the subsequent coating of nano-additives. This pretreatment method not only improves the coating efficiency, but also ensures the uniformity and stability of the coating layer. The well-designed nano-additive dispersion liquid preparation process in step S2 ensures the uniform dispersion of nano-TiO2 in the dispersion liquid, which is crucial for the subsequent coating process. The three-stage ultrasonic dispersion further optimizes the dispersion effect of the nano-additive, thereby improving the uniformity and density of the coating layer. The coating process in step S3 adopts a combination of low-speed mixing and high shearing, which not only ensures the full contact of the nano-additive with the electrolytic manganese dioxide powder, but also achieves the uniform coating of the nano-additive on the powder surface. In addition, the coating efficiency and the stability of the coating layer are further improved by adopting zirconium oxide ball milling and the coating process in an N2 atmosphere. The drying and pulverization process in step S4 utilizes advanced fluidized bed drying technology and a supersonic airflow mill, ensuring rapid drying of the coated material and uniformity of the pulverized particles. Furthermore, surface hydrophilic modification by spraying with a dodecyltrimethylammonium bromide solution enhances the hydrophilic properties of the electrolytic manganese dioxide, further improving its application as a cathode material for alkaline zinc-manganese batteries.

[0023] Specifically, the plasma activation pretreatment in step S1 is to use radio frequency plasma equipment to feed the raw material electrolytic manganese dioxide powder into the plasma treatment device, close the chamber, and start the vacuum system to pump to a basic vacuum degree of <1×10 -2 Pa, in an Ar / O2 mixed atmosphere (volume ratio of Ar:O2 = 4:1), and with the vacuum system adjusted to maintain a stable chamber operating pressure of 20 Pa, RF plasma is ignited and treated at a power of 50-200 W for 1-5 minutes, preferably 100 W for 3 minutes. This plasma activation pretreatment can enhance the surface activity of the electrolytic manganese dioxide powder, providing more favorable conditions for subsequent coating with nano-additives.

[0024] In the present embodiment, the preparation method of the nano additive dispersion liquid described in step S2 is: nano TiO Premix with deionized water, then add sodium dodecylbenzene sulfonate and sodium polyacrylate, wherein the volume ratio of sodium dodecylbenzene sulfonate and sodium polyacrylate is 2:1-1:2.Nano TiO Particle diameter is 20-50nm, and the solid content that is scattered in the deionized water is 5-15wt%.Described sodium dodecylbenzene sulfonate and sodium polyacrylate, consumption 0.01-0.5wt%, have added anionic surfactant in this nano additive, greatly promoted nano TiO Uniformity and stability in dispersion liquid, follow-up is coated in the liquid phase and collaboratively improves dispersion stability and anti-electrolyte interference ability.This step has guaranteed the high dispersibility and stability of nano additive in dispersion liquid.Surfactant reduces interfacial energy, and this dispersion liquid provides ideal nano additive source for follow-up coating process, helps to form uniform and dense coating.

[0025] In this embodiment, the method for preparing the nano-additive dispersion further comprises performing ultrasonic dispersion in three stages: The first stage has an ultrasonic frequency of 20-30kHz and a duration of 5-8 minutes, which is used to break up large particle agglomerates. The second stage has an ultrasonic frequency of 40-50kHz and a duration of 10-12 minutes, which is used to achieve nano-scale dispersion. The third stage has an ultrasonic frequency of 25-30kHz and a duration of 5-8 minutes, which is used to stabilize the dispersed system and prevent secondary agglomeration.

[0026] In the present embodiment, the nano additive described in step S3 coats electrolytic manganese dioxide powder, dispersion liquid: EMD=0.5%-3%, and the pH value of utilizing pH adjusting agent to regulate the nano additive dispersion liquid before coating is 6.0-7.5, to optimize the Zeta potential on nano particle and EMD surface, enhance electrostatic stability and reduce agglomeration. The pH adjusting agent is the one in ammoniacal liquor, NaOH or citric acid. Coating comprises low-speed mixing stage and high-shear stage, and the rotating speed of the low-speed mixing stage is 30-40rpm, and the time is 2-2.5h, is pre-dispersed; The rotating speed of the high-shear stage is 120-150rpm, and the time is 1-1.5h, is forced to coat.

[0027] Furthermore, the low-speed mixing and high-shear stages utilize zirconia ball milling, with a ball-to-material ratio of 1-1.5:1. The zirconia balls consist of 30% large balls with a diameter of 10 mm, 50% medium balls with a diameter of 5 mm, and 20% small balls with a diameter of 3 mm. The diverse ball sizes enhance coating uniformity. The low-speed mixing and high-shear stages are performed in an N2 atmosphere with humidity controlled below 30%. The inert atmosphere prevents oxidation of metal ions.

[0028] In this embodiment, the drying in step S4 is performed using a fluidized bed. The slurry from step S3 is sprayed into the fluidized bed via a centrifugal atomizer at a speed of 18,000-20,000 rpm, with an inlet temperature of 80°C and an outlet temperature of 40°C for 8-20 minutes, until the moisture content is reduced to approximately 10%. In another preferred embodiment, a vacuum belt dryer can be used for drying at a temperature of 60°C, a vacuum degree of -0.08 MPa, and a drying time of 30-60 minutes, until the moisture content is less than 0.5%.

[0029] In this embodiment, the pulverization in step S4 is performed by using a supersonic airflow pulverizer with a pulverization pressure of 0.8-0.9 MPa, and the particles after pulverization are 20 μm≤D50≤45 μm; The process also includes sieving, spraying 0.1-0.2% dodecyltrimethylammonium bromide solution before sieving to simultaneously complete the surface hydrophilic modification, with a sieving mesh size of 400. This step combines pulverization with surface modification to improve the material's wettability in the electrolyte.

[0030] An embodiment of the second aspect of the present invention provides an electrolytic manganese dioxide prepared by the above-mentioned method of blending and coating electrolytic manganese dioxide.

[0031] The electrolytic manganese dioxide prepared by the method of the present invention exhibits excellent electrochemical and physical properties. The nano-additive coating on its surface not only enhances the material's activity but also strengthens its stability and cycling performance in alkaline zinc-manganese batteries. Furthermore, through a carefully designed preparation process, the present invention successfully overcomes the problems of material waste, difficulty in handling additives and waste liquids, and uneven coating associated with traditional blending and coating methods.

[0032] An embodiment of the third aspect of the present invention provides a use of the electrolytic manganese dioxide in a positive electrode material for an alkaline zinc-manganese battery.

[0033] In specific applications, the electrolytic manganese dioxide of the present invention, as the positive electrode material for alkaline zinc-manganese batteries, can significantly increase the battery's discharge capacity and extend its service life. Furthermore, its excellent hydrophilicity enhances the material's wettability in the electrolyte, further improving battery performance.

[0034] In summary, the method for blending and coating electrolytic manganese dioxide, electrolytic manganese dioxide, and applications thereof of the present invention not only solve many problems in the prior art, but also achieve uniform coating of the material and improvement of excellent performance through an innovative preparation process, and have broad application prospects and market value.

[0035] Example 1 A method for mixing and coating electrolytic manganese dioxide, comprising the following steps: S1: Electrolytic manganese dioxide powder was pre-treated by plasma activation in an Ar / O2 mixed atmosphere at a power of 100 W for 3 min; S2: Prepare a nano-additive dispersion by pre-mixing nano-TiO2 and deionized water to a solid content of 8 wt%, then add sodium dodecylbenzene sulfonate and sodium polyacrylate at a concentration of 0.2 wt% of the weight of the nano-TiO2; adjust the pH of the nano-additive dispersion to 6.0-7.5, and perform ultrasonic dispersion in three stages: The first stage has an ultrasonic frequency of 20kHz and a duration of 5 minutes, which is used to break up large particle agglomerates. The second stage has an ultrasonic frequency of 40kHz and a duration of 10 minutes, which is used to achieve nano-scale dispersion. The third stage has an ultrasonic frequency of 25kHz and a duration of 5min, which is used to stabilize the dispersion system and prevent secondary agglomeration; S3: Coating the electrolytic manganese dioxide powder with a nano-additive dispersion includes a low-speed mixing stage and a high-shear stage, wherein the low-speed mixing stage has a rotation speed of 30 rpm and a time of 2.5 hours for pre-dispersion; the high-shear stage has a rotation speed of 120 rpm and a time of 1.5 hours for forced coating, and zirconia ball milling is used during the coating process; the ball-to-material ratio is 1.5:1; the coating process is carried out in an N2 atmosphere with the humidity controlled to be less than 30% to obtain a coated material; S4: Drying and sieving the coated material. The drying is carried out by fluidized bed drying. The slurry is sprayed into the fluidized bed through a centrifugal atomizer at a speed of 18,000 rpm, with an inlet temperature of 80°C and an outlet temperature of 40°C for 12 minutes to reduce the moisture content to about 10%. The slurry is then dried in a vacuum belt dryer at a temperature of 60°C, a vacuum degree of -0.08 MPa, and a drying time of 40 minutes to reduce the moisture content to <0.5%. The pulverization is carried out by using a supersonic air flow pulverizer with a pulverizing pressure of 0.8 MPa, and the particles after pulverization are 20 μm≤D50≤45 μm; 0.1-0.2% dodecyltrimethylammonium bromide solution is sprayed before sieving, and the sieving mesh number is 400 mesh.

[0036] See also Figures 1 to 3 ,in Figure 1 Electron micrograph of titanium dioxide; Figure 2 and Figure 3 This is a sample picture of nano-titanium dioxide mixed with electrolytic manganese dioxide in Example 1.

[0037] See also Figures 4 to 6 , Figures 4 to 6 This is the EDS image of nano-titanium dioxide mixed with electrolytic manganese dioxide in Example 1, where blue and green represent manganese and titanium elements respectively.

[0038] Example 2 This embodiment is basically the same as embodiment 1, except that in step S1, the treatment is performed at a power of 150 W for 2 minutes in an Ar / O2 mixed atmosphere.

[0039] Example 3 This embodiment is basically the same as embodiment 1, except that in step S2, the first stage ultrasonic frequency is 30 kHz, the time is 6 minutes; the second stage ultrasonic frequency is 50 kHz, the time is 12 minutes; the third stage ultrasonic frequency is 28 kHz, the time is 7 minutes.

[0040] Example 4 This embodiment is basically the same as embodiment 1, except that the rotation speed of the low-speed mixing stage in step S3 is 40 rpm and the time is 2 hours, and the rotation speed of the high shear stage is 150 rpm and the time is 1 hour.

[0041] Example 5 This embodiment is basically the same as embodiment 1, except that the crushing pressure in step S4 is 0.9 MPa.

[0042] Comparative Example 1 Electrolytic manganese dioxide powder raw material, not coated with nano titanium dioxide.

[0043] Experimental Case The EMD (electrolytic manganese dioxide) raw material of Comparative Example 1 and the EMD prepared in Example 1 using titanium dioxide mixed and coated were tested for 67.2 ohm constant resistance discharge performance using alkaline manganese button LR44 batteries. The results are shown in the figure. Figure 7 .

[0044] from Figure 7 It can be seen that the EMD mixed with coated titanium dioxide in Example 1 of the present invention has a discharge time of 7.68 hours, which is increased by 104.17% to 8.00 hours, and a discharge capacity of 124.67 mAh, which is increased by 105.03% to 130.94 mAh, compared with the EMD raw material not mixed with coated titanium dioxide in Comparative Example 1.

[0045] It should be noted that the present application is not limited to the above-mentioned embodiments.

[0046] The above embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the present application are all included within the technical scope of the present application. In addition, within the scope of the present application, any other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included within the scope of the present application.

Claims

1. A method for mixing and coating electrolytic manganese dioxide, characterized in that: The following steps are involved: S1: Plasma activation pretreatment of electrolytic manganese dioxide powder; S2: preparing a nano-additive dispersion, wherein the nano-additive dispersion comprises a nano-additive and an anionic surfactant, wherein the nano-additive comprises nano-TiO2, and the anionic surfactant comprises sodium dodecylbenzene sulfonate and sodium polyacrylate; S3: coating the electrolytic manganese dioxide powder after the plasma activation pretreatment in step S1 with the nano-additive dispersion to obtain a coated material; S4: Drying and crushing the coated material.

2. The method for mixing and coating electrolytic manganese dioxide according to claim 1, characterized in that: The plasma activation pretreatment in step S1 is to feed the raw material electrolytic manganese dioxide powder into a plasma treatment device and treat it at a power of 50-200W for 1-5 minutes in an Ar / O2 mixed atmosphere.

3. The method for mixing and coating electrolytic manganese dioxide according to claim 1, characterized in that: The preparation method of the nano-additive dispersion described in step S2 is: pre-mixing nano-TiO2 and deionized water, and then adding sodium dodecylbenzene sulfonate and sodium polyacrylate, wherein the volume ratio of sodium dodecylbenzene sulfonate to sodium polyacrylate is 2:1-1:

2.

4. The method for blending and coating electrolytic manganese dioxide according to claim 3, characterized in that: The method for preparing the nano-additive dispersion further comprises performing ultrasonic dispersion in three stages: The first stage has an ultrasound frequency of 20-30 kHz and a duration of 5-8 minutes; and / or The second stage has an ultrasound frequency of 40-50kHz and a duration of 10-12 minutes; and / or The third stage ultrasound frequency is 25-30kHz and the duration is 5-8min.

5. The method for blending and coating electrolytic manganese dioxide according to claim 1, characterized in that: In step S3, the nano-additive dispersion coating the electrolytic manganese dioxide powder includes adjusting the pH of the nano-additive dispersion to 6.0-7.5 using a pH regulator, and a low-speed mixing stage and a high-shear stage. The low-speed mixing stage has a rotation speed of 30-40 rpm and a duration of 2-2.5 h; and / or The rotation speed of the high shear stage is 120-150 rpm, and the time is 1-1.5 hours.

6. The method for blending and coating electrolytic manganese dioxide according to claim 5, characterized in that: The low-speed mixing stage and the high-shear stage use zirconia ball milling; and / or the ball-to-material ratio is 1-1.5:1; and / or The low-speed mixing stage and the high-shear stage were carried out in a N2 atmosphere.

7. The method for blending and coating electrolytic manganese dioxide according to claim 1, characterized in that: The drying in step S4 is performed by fluidized bed drying. The slurry in step S3 is sprayed into the fluidized bed through a centrifugal atomizer at a rotation speed of 18,000-20,000 rpm, with an inlet temperature of 80° C., an outlet temperature of 40° C., and a drying time of 8-20 minutes.

8. The method for blending and coating electrolytic manganese dioxide according to claim 1, characterized in that: The pulverization in step S4 is performed by using a supersonic airflow pulverizer with a pulverization pressure of 0.8-0.9 MPa, and the particles after pulverization are 20 μm ≤ D50 ≤ 45 μm; and / or The method also includes screening. Before screening, 0.1-0.2% dodecyltrimethylammonium bromide solution is sprayed to simultaneously complete the surface hydrophilic modification. The screening mesh number is 400 meshes.

9. An electrolytic manganese dioxide, characterized in that The manganese dioxide is prepared by the method of mixing and coating electrolytic manganese dioxide according to any one of claims 1 to 8.

10. Use of the electrolytic manganese dioxide according to claim 9 in a positive electrode material for an alkaline zinc-manganese battery.

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