Micron nickel powder and preparation method and application thereof
By preparing spherical micron nickel powder formed by the self-assembly of nanowires or nanosheets, the problem of insufficient specific surface area in the existing technology has been solved, and the application of high-performance micron nickel powder has been realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WUHAN CHANGHAI INVESTMENT CO LTD
- Filing Date
- 2026-01-15
- Publication Date
- 2026-05-15
AI Technical Summary
In existing technologies, the specific surface area of micron-sized nickel powder is limited, which affects its performance in fields such as multilayer ceramic capacitors, magnetic fluids, conductive adhesives, and catalysts.
A preparation method is adopted, which involves dissolving nickel salt and structure-directing agent in deionized water, mixing them, and then reacting them with hydrazine sulfate and alkali under mild conditions to form spherical micron nickel powder with self-assembled nanowires or nanosheets. The powder has multiple pores on its surface, which increases the specific surface area.
Micron-sized nickel powder with extremely high specific surface area and surface activity was prepared, which enhanced the bonding strength with the polymer matrix and improved the strength and toughness of the composite material. It is suitable for high-performance polymer composite materials, conductive pastes and catalysts.
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Figure CN122033236A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of nickel powder technology, specifically to a micron-sized nickel powder, its preparation method, and its applications. Background Technology
[0002] Micro- and nano-sized nickel powders have wide applications in fields such as internal electrodes of multilayer ceramic capacitors (MLCCs), magnetic fluids, conductive adhesives, catalysts, and polymer composites due to their excellent magnetic properties, electrical conductivity, and catalytic activity. The performance of nickel powders largely depends on their size, morphology, and structure.
[0003] Currently, the mainstream method for preparing nickel powder is the "one-pot" hydrothermal reaction to produce smooth, spherical powder. However, nickel powder with this morphology has the problem of limited specific surface area. Summary of the Invention
[0004] In view of the technical problems existing in the background art, this application provides a micron nickel powder, its preparation method and application, aiming to provide a micron nickel powder with high specific surface area.
[0005] In one aspect, embodiments of this application provide a micron-sized nickel powder, wherein the micron-sized nickel powder is a fluffy ball-shaped particle.
[0006] Optionally, in some embodiments of this application, the micron-sized nickel powder is formed by the self-assembly of nanowires or nanosheets.
[0007] Optionally, in some embodiments of this application, the surface of the micron-sized nickel powder has multiple pores.
[0008] Optionally, in some embodiments of this application, the particle size of a single spherical particle is 2~8μm.
[0009] Secondly, embodiments of this application provide a method for preparing the micron-sized nickel powder described above, comprising the following steps: Dissolve the nickel salt and the structure-directing agent in deionized water to obtain solution A; Dissolve hydrazine sulfate and a base in deionized water to obtain solution B; Solution A and solution B are mixed and reacted at 60-95°C for 0.5-5 hours to obtain the reaction product; The reaction product was subjected to solid-liquid separation, and the solid phase was collected, washed, and dried to obtain micron-sized nickel powder.
[0010] Optionally, in some embodiments of this application, the structure directing agent is hexadecyltrimethylammonium bromide.
[0011] Optionally, in some embodiments of this application, the nickel salt includes one or more of nickel sulfate and its hydrate, nickel chloride and its hydrate, and nickel nitrate and its hydrate.
[0012] Optionally, in some embodiments of this application, the molar amount of the nickel salt to the mass ratio of the structure directing agent is 0.05~2 mol: 0.5~20 g.
[0013] Optionally, in some embodiments of this application, the concentration of the nickel salt in solution A is 0.05~2 mol / L, and the concentration of the structure directing agent is 0.5~20 g / L.
[0014] Optionally, in some embodiments of this application, the molar ratio of the hydrazine sulfate to the nickel element in the nickel salt is (1~10):1.
[0015] Optionally, in some embodiments of this application, the alkali includes sodium hydroxide or ammonia.
[0016] Optionally, in some embodiments of this application, the concentration of the alkali in solution B is 0.1~4 mol / L.
[0017] Optionally, in some embodiments of this application, vacuum drying is used for drying, and the drying temperature is 30~80℃, and the drying time is 0.5~72h.
[0018] Thirdly, embodiments of this application also propose the application of the micron-sized nickel powder described above in the preparation of polymer-based composite materials, conductive pastes, or catalysts.
[0019] The technical solution proposed in this application has the following beneficial effects: The technical solution of this application proposes a micron-sized nickel powder with a unique spherical structure. The nickel powder is roughly spherical and has a rough structure on the surface composed of multiple nanoscale spikes or sheets. This structure endows the micron-sized nickel powder with extremely high specific surface area and high surface activity.
[0020] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.
[0022] Figure 1This is a SEM image of the micron-sized nickel powder prepared in Example 1 at high magnification; Figure 2 for Figure 1 SEM image of medium-micron nickel powder at low magnification; Figure 3 The XRD pattern of the micron-sized nickel powder prepared in Example 1; Figure 4 This is a SEM image of the micron-sized nickel powder prepared in Example 2 at high magnification; Figure 5 for Figure 4 SEM image of medium-micron nickel powder at low magnification; Figure 6 This is a SEM image of the micron-sized nickel powder prepared in Example 3 at low magnification; Figure 7 This is a SEM image of the micron-sized nickel powder prepared in Example 4 at low magnification; Figure 8 This is a SEM image of the micron-sized nickel powder prepared in Example 5 at low magnification; Figure 9 The image shows a high-magnification SEM image of the micron-sized nickel powder prepared in Comparative Example 1. Figure 10 This is a SEM image of the micron-sized nickel powder prepared in Comparative Example 2 at high magnification. Figure 11 This is a SEM image of the micron-sized nickel powder prepared in Comparative Example 3 at high magnification. Detailed Implementation
[0023] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion.
[0025] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.
[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0029] In the description of the embodiments of this application, the term "at least one" refers to one or more, "more than one" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces). "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b, or c," or "at least one of a, b, and c," can all represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.
[0030] In one aspect, embodiments of this application provide a micron-sized nickel powder, wherein the micron-sized nickel powder is a fluffy ball-shaped particle.
[0031] The technical solution of this application proposes a micron-sized nickel powder with a unique three-dimensional structure. The nickel powder is roughly spherical and has a rough structure on the surface composed of multiple nanoscale spikes or sheets. This structure endows the micron-sized nickel powder with extremely high specific surface area and high surface activity.
[0032] In addition, the micron-sized nickel powder based on this structure can also generate a strong mechanical interlocking effect with the polymer matrix. When used as a filler in polymer-based composite materials, it helps to enhance the bonding strength between the filler and the matrix, and improve the strength and toughness of the composite material.
[0033] In some embodiments of this application, the micron-sized nickel powder is formed by the self-assembly of one-dimensional nanowires and / or two-dimensional nanosheets. The overall particle is a micron-sized fluffy ball, resembling a dandelion fluff ball, with its surface composed of multiple nanowires or nanosheets, forming multiple pores and possessing a rich porous structure.
[0034] In some embodiments of this application, the particle size of a single pom-pom-like particle is 2~8μm.
[0035] Secondly, embodiments of this application provide a method for preparing the micron-sized nickel powder described above, comprising the following steps: S10, dissolve the nickel salt and structure directing agent in deionized water to obtain solution A; S20, dissolve hydrazine sulfate and alkali in deionized water to obtain solution B; S30, mix solution A and solution B, and react at 60~95℃ for 0.5~5h to obtain the reaction product; S40, the reaction product is subjected to solid-liquid separation, the solid phase is collected, washed and dried to obtain micron-sized nickel powder.
[0036] The preparation method provided in this application utilizes the mild reducing properties of hydrazine sulfate under alkaline conditions, combined with the dispersing and guiding effect of a structure-directing agent, to react at a mild temperature and self-assemble into a unique spherical structure. The resulting nickel powder possesses three-dimensional open pores, a large specific surface area, high surface activity, and strong bonding with the polymer matrix, showing broad application prospects in high-performance polymer composites, conductive pastes, and catalysts. Furthermore, this application optimizes the raw materials by using stable, non-volatile, and non-corrosive hydrazine sulfate as a raw material, which helps to improve reaction stability.
[0037] This method is simple, has mild reaction conditions, and is highly safe. By adjusting parameters such as nickel salt concentration, structure guiding agent dosage, reaction temperature, and time, the size of the fluffy nickel powder can be effectively controlled, resulting in good process controllability. Moreover, this method requires less complex equipment, only ordinary heating devices (such as water baths), without the need for special equipment such as microwaves or hydrothermal systems, or complex hard or soft templates, which greatly reduces production costs and facilitates large-scale production.
[0038] The structure-directing agent is hexadecyltrimethylammonium bromide. The hydrophilic head groups of hexadecyltrimethylammonium bromide are adsorbed onto a nickel precursor with a specific crystal facet via electrostatic interaction, effectively guiding the formation of nanowires and nanosheets. These nanowires and nanosheets can serve as secondary units, further assembling into three-dimensional spheres. Unlike other conventional structure-directing agents, hexadecyltrimethylammonium bromide, through its own action and its synergy with hydrazine sulfate, can directionally guide the formation of a spherical morphology.
[0039] The nickel salt may include, but is not limited to, one or more of nickel sulfate and its hydrate, nickel chloride and its hydrate, and nickel nitrate and its hydrate. For example, nickel sulfate (NiSO4·6H2O), nickel chloride (NiCl2·6H2O), nickel nitrate (Ni(NO3)2·6H2O), etc.
[0040] The alkali may include, but is not limited to, sodium hydroxide or ammonia.
[0041] In some embodiments of this application, the amounts of nickel salt and structure-directing agent fed in meet the following condition: the molar ratio of the nickel salt to the mass of the structure-directing agent is 0.05~2 mol: 0.5~20 g. Further, in some embodiments of this application, in solution A, the concentration of the nickel salt is 0.05~2 mol / L, and the concentration of the structure-directing agent is 0.5~20 g / L.
[0042] In some embodiments of this application, the amount of hydrazine sulfate fed satisfies the following condition: the molar ratio of the hydrazine sulfate to the nickel element in the nickel salt is (1~10):1.
[0043] Furthermore, in some embodiments of this application, the amount of alkali added satisfies the following condition: the concentration of the alkali in solution B is 0.1~4 mol / L.
[0044] The reaction in step S30 requires minimal heating equipment and can be carried out under conventional water bath or oil bath heating without the need for microwave or hydrothermal assistance.
[0045] In step S40, after the reaction is complete, the mixture is naturally cooled to room temperature, and the reaction product is subjected to solid-liquid separation to obtain the solid precipitate. In practice, solid-liquid separation can be performed by vacuum filtration or centrifugation.
[0046] In some embodiments of this application, step S40 can be performed by vacuum drying, and the drying temperature is 30~80℃, and the drying time is 0.5~72h.
[0047] Thirdly, embodiments of this application also propose an application of the aforementioned micron-sized nickel powder in the preparation of polymer-based composite materials, conductive slurries, or catalysts. For example, the aforementioned micron-sized nickel powder can be used as a filler to prepare polymer-based composite materials, or as a conductive component to prepare conductive slurries, or as a catalyst component or active ingredient to prepare catalysts.
[0048] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.
[0049] Example 1 1. Weigh 2.63 g of nickel sulfate hexahydrate (NiSO4·6H2O, 0.01 mol) and 1.0 g of hexadecyltrimethylammonium bromide (CTAB), dissolve them in 200 mL of deionized water, and stir for 30 minutes to obtain a clear blue solution A. In solution A, the concentration of nickel salt is 0.05 mol / L, and the concentration of CTAB is 5 g / L.
[0050] 2. Weigh 6.56 g of hydrazine sulfate (N2H4·H2SO4, approximately 0.05 mol, which is 5 times the concentration of nickel ions) and 4.0 g of sodium hydroxide, dissolve them in 200 mL of deionized water, and stir to obtain solution B. The concentration of sodium hydroxide in solution B is 0.5 mol / L.
[0051] 3. Quickly pour solution B into solution A, mix thoroughly, and then place in an 80 ℃ constant temperature water bath for 2 h. During the reaction, the solution gradually turns dark black and produces a large amount of black precipitate.
[0052] 4. After the reaction is complete, allow it to cool naturally to room temperature, and then use a vacuum filtration device to separate the solid and liquid. The resulting black solid is washed three times each with deionized water and anhydrous ethanol.
[0053] 5. Place the washed product in a vacuum drying oven at 60 ℃ and dry for 6 h to obtain black, fluffy, spherical micron nickel powder.
[0054] The morphology of micron-sized nickel powder was measured using scanning electron microscopy (SEM), and the results are as follows: Figure 1 and Figure 2 As shown in the figure, the nickel powder consists of fluffy, spherical particles with a diameter of 4-8 μm, which are composed of self-assembled nanowires.
[0055] Micron-sized nickel powder was analyzed using X-ray powder diffraction (XRD), and the results are as follows: Figure 3 As shown in the figure, the product obtained in this embodiment is pure-phase metallic nickel.
[0056] Example 2 1. Weigh 5.26 g of nickel sulfate hexahydrate (0.02 mol) and 2.0 g of CTAB, dissolve them in 400 mL of deionized water, and stir for 30 minutes to obtain a clear blue solution A. In solution A, the concentration of nickel salt is 0.05 mol / L and the concentration of CTAB is 5 g / L.
[0057] 2. Weigh 7.88 g of hydrazine sulfate (approximately 0.06 mol, three times the concentration of nickel ions) and 4.0 g of sodium hydroxide, dissolve them in 200 mL of deionized water, and stir to obtain solution B. The concentration of sodium hydroxide in solution B is 0.5 mol / L.
[0058] 3. Quickly pour solution B into solution A, mix thoroughly, and then place in a 75 ℃ constant temperature water bath for 4 h. During the reaction, the solution gradually turns dark black and produces a large amount of black precipitate.
[0059] 4. After the reaction is complete, allow it to cool naturally to room temperature, and then use a vacuum filtration device to separate the solid and liquid. The resulting black solid is washed three times each with deionized water and anhydrous ethanol.
[0060] 5. Place the washed product in a vacuum drying oven at 60 ℃ and dry for 6 h to obtain black, fluffy, spherical micron nickel powder.
[0061] The morphology of micron-sized nickel powder was measured using scanning electron microscopy (SEM), and the results are as follows: Figure 4 and Figure 5 As shown in the figure, the nickel powder consists of fluffy, spherical particles with a diameter of 4-8 μm, which are composed of self-assembled nanowires.
[0062] Example 3 1. Weigh 10.51 g of nickel sulfate hexahydrate (0.04 mol) and 4.0 g of CTAB, dissolve them in 200 mL of deionized water, and stir for 30 minutes to obtain a clear blue solution A. In solution A, the concentration of nickel salt is 0.2 mol / L and the concentration of CTAB is 20 g / L.
[0063] 2. Weigh 5.25 g of hydrazine sulfate (approximately 0.04 mol, which is 1 times the concentration of nickel ions) and 0.8 g of sodium hydroxide, dissolve them in 200 mL of deionized water, and stir to dissolve, obtaining solution B. The concentration of sodium hydroxide in solution B is 0.1 mol / L.
[0064] 3. Quickly pour solution B into solution A, mix thoroughly, and then place in a 60 ℃ constant temperature water bath for 5 h. During the reaction, the solution gradually turns dark black and produces a large amount of black precipitate.
[0065] 4. After the reaction is complete, allow it to cool naturally to room temperature, and then use a vacuum filtration device to separate the solid and liquid. The resulting black solid is washed three times each with deionized water and anhydrous ethanol.
[0066] 5. Place the washed product in an 80 ℃ vacuum drying oven and dry for 5 h to obtain black, fluffy, spherical micron nickel powder.
[0067] The morphology of micron-sized nickel powder was measured using scanning electron microscopy (SEM), and the results are as follows: Figure 6 As shown in the figure, the nickel powder consists of fluffy, spherical particles with a diameter of 4-6 μm, which are composed of self-assembled nanowires.
[0068] Example 4 1. Weigh 95.08 g of nickel chloride hexahydrate (approximately 0.4 mol) and 4.0 g of CTAB, dissolve them in 200 mL of deionized water, and stir for 30 minutes to obtain a clear blue solution A. In solution A, the concentration of nickel salt is 2 mol / L, and the concentration of CTAB is 20 g / L.
[0069] 2. Weigh 52.05 g of hydrazine sulfate (N2H4·H2SO4, approximately 0.4 mol, which is 1 times the concentration of nickel ions) and 4.0 g of sodium hydroxide, dissolve them in 200 mL of deionized water, and stir to obtain solution B. The concentration of sodium hydroxide in solution B is 0.5 mol / L.
[0070] 3. Quickly pour solution B into solution A, mix thoroughly, and then place in a 95 ℃ constant temperature water bath to react for 0.5 h. During the reaction, the solution gradually turns dark black and produces a large amount of black precipitate.
[0071] 4. After the reaction is complete, allow it to cool naturally to room temperature, and then use a vacuum filtration device to separate the solid and liquid. The resulting black solid is washed three times each with deionized water and anhydrous ethanol.
[0072] 5. Place the washed product in an 80 ℃ vacuum drying oven and dry for 5 h to obtain black, fluffy, spherical micron nickel powder.
[0073] The morphology of micron-sized nickel powder was measured using scanning electron microscopy (SEM), and the results are as follows: Figure 7 As shown in the figure, the nickel powder consists of fluffy, spherical particles with a diameter of 2-4 μm, which are composed of self-assembled nanosheets.
[0074] Example 5 1. Weigh 2.63 g of nickel sulfate hexahydrate (0.01 mol) and 0.1 g of CTAB, dissolve them in 200 mL of deionized water, and stir for 30 minutes to obtain a clear blue solution A. In solution A, the concentration of nickel salt is 0.05 mol / L and the concentration of CTAB is 0.5 g / L.
[0075] 2. Weigh 13.1 g of hydrazine sulfate (approximately 0.1 mol, which is 10 times the concentration of nickel ions) and 32 g of sodium hydroxide, dissolve them in 200 mL of deionized water, and stir to obtain solution B. The concentration of sodium hydroxide in solution B is 4 mol / L.
[0076] 3. Quickly pour solution B into solution A, mix thoroughly, and then place in an 80 ℃ constant temperature water bath for 2 h. During the reaction, the solution gradually turns dark black and produces a large amount of black precipitate.
[0077] 4. After the reaction is complete, allow it to cool naturally to room temperature, and then use a vacuum filtration device to separate the solid and liquid. The resulting black solid is washed three times each with deionized water and anhydrous ethanol.
[0078] 5. Place the washed product in a vacuum drying oven at 30 ℃ and dry for 12 h to obtain black, fluffy, spherical micron nickel powder.
[0079] The morphology of micron-sized nickel powder was measured using scanning electron microscopy (SEM), and the results are as follows: Figure 8 As shown in the figure, the nickel powder consists of fluffy, spherical particles with a diameter of 2-4 μm, which are composed of self-assembled nanowires.
[0080] Comparative Example 1 This comparative example is basically the same as Example 1, except that CTAB is not added in step 1 of this comparative example. All other parameters and conditions remain unchanged.
[0081] The morphology of micron-sized nickel powder was measured using scanning electron microscopy (SEM), and the results are as follows: Figure 9 As shown in the figure, the product obtained in this comparative example is an irregularly agglomerated granular nickel powder that cannot form a regular spherical structure. This indicates that the structure-directing agent plays a key role in guiding the growth of nanowires and their self-assembly into a micron-sized spherical structure.
[0082] Comparative Example 2 This comparative example is essentially the same as Example 1, except that in step 1, 1.0 g CTAB is replaced with 1.0 g polyethylene glycol (PEG). All other parameters and conditions remain unchanged.
[0083] The morphology of micron-sized nickel powder was measured using scanning electron microscopy (SEM), and the results are as follows: Figure 10 As shown in the figure, the product obtained in this comparative example is a submicron spiky spherical particle. The spiky structure is a needle-like or rod-like protrusion, rather than a self-assembled structure of wires or sheets. This indicates that the structure-directing agent hexadecyltrimethylammonium bromide (CTAB) plays a key role in guiding the growth of nanowires and their self-assembly into micron-sized spherical structures.
[0084] Comparative Example 3 This comparative example uses a one-pot hydrothermal reaction to prepare nickel powder, and the preparation steps are as follows: 1. Weigh 2.63 g of nickel sulfate hexahydrate (NiSO4·6H2O, 0.01 mol), 6.56 g of hydrazine sulfate (N2H4·H2SO4, about 0.05 mol, which is 5 times the amount of nickel ions), and 4.0 g of sodium hydroxide, dissolve them in 400 mL of deionized water, stir for 30 minutes, and obtain solution A.
[0085] 2. Solution A was placed in an 80 ℃ constant temperature water bath for 2 h. During the reaction, the solution gradually turned dark black and produced a large amount of black precipitate.
[0086] 3. After the reaction is complete, the mixture is allowed to cool naturally to room temperature. Solid-liquid separation is performed using a vacuum filtration device. The resulting black solid is washed three times each with deionized water and anhydrous ethanol.
[0087] 4. Place the washed product in a vacuum drying oven at 60 ℃ and dry for 6 h to obtain black, fluffy, spherical micron nickel powder.
[0088] The morphology of micron-sized nickel powder was measured using scanning electron microscopy (SEM), and the results are as follows: Figure 11 As shown in the figure, the product obtained in this comparative example is a smooth-surfaced spherical nickel powder.
[0089] The micron-sized nickel powders prepared in each example and comparative example were tested according to the GB / T13390-2008 surface area analyzer / nitrogen adsorption method, and the results are shown in Table 1.
[0090] Table 1
[0091] It can be seen that, compared with the comparative example, the nickel powder prepared in each embodiment has a higher specific surface area.
[0092] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.
Claims
1. A micron-sized nickel powder, characterized in that, The micron-sized nickel powder consists of fluffy, ball-shaped particles.
2. The micron-sized nickel powder according to claim 1, characterized in that, The micron-sized nickel powder is formed by the self-assembly of nanowires or nanosheets; and / or, The surface of the micron-sized nickel powder has multiple pores; and / or, The particle size of a single fluffy particle is 2~8μm.
3. A method for preparing micron-sized nickel powder according to claim 1 or 2, characterized in that, Includes the following steps: Dissolve the nickel salt and the structure-directing agent in deionized water to obtain solution A; Dissolve hydrazine sulfate and a base in deionized water to obtain solution B; Solution A and solution B are mixed and reacted at 60-95°C for 0.5-5 hours to obtain the reaction product; The reaction product was subjected to solid-liquid separation, and the solid phase was collected, washed, and dried to obtain micron-sized nickel powder.
4. The preparation method according to claim 3, characterized in that, The structure directing agent is hexadecyltrimethylammonium bromide; and / or, The nickel salt includes one or more of nickel sulfate and its hydrate, nickel chloride and its hydrate, and nickel nitrate and its hydrate.
5. The preparation method according to claim 3, characterized in that, The molar ratio of the nickel salt to the mass of the structure-directing agent is 0.05~2 mol: 0.5~20 g.
6. The preparation method according to claim 5, characterized in that, In solution A, the concentration of the nickel salt is 0.05~2 mol / L, and the concentration of the structure directing agent is 0.5~20 g / L.
7. The preparation method according to claim 3, characterized in that, The molar ratio of hydrazine sulfate to nickel in the nickel salt is (1~10):
1.
8. The preparation method according to claim 3, characterized in that, The alkali includes sodium hydroxide or ammonia.
9. The preparation method according to claim 3, characterized in that, In solution B, the concentration of the alkali is 0.1~4 mol / L; and / or, The drying process is carried out using vacuum drying, with a drying temperature of 30~80℃ and a drying time of 0.5~72h.
10. The use of the micron-sized nickel powder according to claim 1 or 2 in the preparation of polymer-based composite materials, conductive pastes or catalysts.