Preparation method of vanadium pentoxide nanowire

Abstract

The invention discloses a vanadium pentoxide nanowire preparation method, which comprises: 1, dissolving vanadium pentoxide in deionized water, and stirring at a room temperature until the solution is completely dissolved; 2, adding a template agent and a surfactant into the solution prepared in the step 1, and continuously stirring; and step 3, standing the solution stirred in the step 2, discarding supernate after the solution is layered, and drying the remaining substance at normal pressure. The vanadium pentoxide nanowire has more excellent cycling stability and specific capacity when being used for an aqueous zinc ion battery cathode material, and compared with an existing technology for preparing the vanadium pentoxide nanowire or nanobelt, complex processes such as a hydrothermal process and reaction equipment are not needed, and the vanadium pentoxide nanowire has the advantages of being simpler in process, lower in cost and the like and is suitable for large-scale industrial production. And the method has a considerable industrial application prospect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of nanometer material preparation, and particularly relates to a preparation method of vanadium pentoxide nanowires. BACKGROUND

[0002] Vanadium pentoxide has unique photoelectric properties, excellent catalytic performance and electrochemical performance, and is widely used in the fields of photoelectricity, catalysis and energy storage. Especially in the electrochemical energy storage industry, vanadium pentoxide is often used as a cathode material for lithium ion batteries and aqueous zinc ion batteries due to its layered structure and multi-valence characteristics. In addition to the original excellent properties, vanadium pentoxide with a nano structure also has a larger specific surface area, providing more active sites for vanadium pentoxide. At present, the synthesis of vanadium pentoxide nanomaterials is usually achieved by a hydrothermal method, which requires the use of a high-pressure hydrothermal reactor. For example, patent CN201910038538.4 discloses a method for preparing vanadium pentoxide nanowire materials by using a hydrothermal reactor. However, this method involves multiple high-temperature reactions, is complicated to operate, and has high maintenance costs, high energy consumption and safety hazards in actual production. In addition, patent CN114573027 discloses a vanadium pentoxide nanobelt and a preparation method thereof. Although the process difficulty is greatly simplified, the process requires ultrasonic treatment. However, ultrasonic equipment generally has low processing efficiency, high cost and produces low-frequency noise in industrial applications, which limits the large-scale industrialization of nanomaterials. Therefore, the present application aims to explore a more convenient and low-cost preparation process for super-long vanadium pentoxide. SUMMARY

[0003] In view of the problems of complicated process, harsh conditions, high cost and high energy consumption in the prior art, the present application aims to provide a preparation method for vanadium pentoxide nanowires, which is simple in process and suitable for large-scale production. The preparation method does not require complex reaction equipment, has mild reaction conditions and is simple to operate, and can obtain vanadium pentoxide nanowires with an average length of about 3 um.

[0004] To solve the problems in the prior art, the technical scheme adopted by the present application is as follows: In a first aspect, the present application provides a preparation method for vanadium pentoxide nanowires, comprising the following steps: Step 1: Dissolve vanadium pentoxide in deionized water and stir at room temperature until the solution is completely dissolved; Step 2: Add a template agent and a surfactant to the solution prepared in step 1 and continue stirring; Step 3: Place the solution after step 2 is finished, discard the supernatant after the solution is layered, and dry the remaining material under normal pressure to obtain vanadium pentoxide nanowires.

[0005] Preferably, in the step 1, the concentration of the prepared vanadium pentoxide solution is 15 mg / ml-25 mg / ml; and / or, the stirring time is 2-4 h.

[0006] Preferably, in the step 2, the molar ratio of vanadium pentoxide, template agent, and surfactant is 5-6:0.1-6:0.1.

[0007] Further preferably, in the step 2, the template agent is at least one of octylamine, ethylenediamine, propylenediamine, and hexylenediamine.

[0008] Further preferably, in the step 2, the surfactant is one of sodium dodecylbenzenesulfonate, cetyltrimethylammonium bromide, and sodium octadecyl sulfate.

[0009] Preferably, in the step 2, the stirring mode is magnetic stirring; more preferably, the stirring speed of the magnetic stirring is 300 rpm-500 rpm, and the stirring time is 8-72 h.

[0010] Further more preferably, the stirring time is 45-60 h.

[0011] Preferably, in the step 3, the standing time is 10-20 min; and / or, the drying temperature is 80-120℃.

[0012] In a second aspect, the present application provides a vanadium pentoxide nanowire prepared by the preparation method of the first aspect.

[0013] Preferably, the length of the vanadium pentoxide nanowire is 1-5 um.

[0014] Compared with the prior art, the present application has the advantages and beneficial effects that: Firstly, the present application can realize the preparation of vanadium pentoxide nanowires through a simple process, mild condition control, and widely available auxiliary agents, and the obtained vanadium pentoxide nanowires have a length of about 3 um. Compared with the existing technologies for preparing vanadium pentoxide nanowires or nanobands, the present application does not need complex processes such as hydrothermal reaction and reaction equipment, has the advantages of simpler process and lower cost, and has considerable industrial application prospects. In addition, compared with the patent CN114573027, the present application does not need to use ultrasonic equipment, has simpler process operation, lower cost, and no low-frequency noise, and has multiple advantages of equipment, cost, and environmental protection in actual production process.

[0015] Secondly, experiments have proved that, compared with the vanadium pentoxide nanobelt disclosed in patent CN114573027A, the vanadium pentoxide nanowire of the present application has more excellent cycle stability and specific capacity when used as a cathode material for a water-based zinc ion battery. Specifically, the vanadium pentoxide nanobelt (VE-C) obtained in Example 1 of patent CN114573027A has a specific capacity of 94.9 mAh g -1 when used as a cathode material for a water-based zinc ion battery under a current density of 10 A g -1 for 5000 times. The vanadium pentoxide nanowire (VE-J) obtained in Example 1 of the present application has a specific capacity of 108.4 mAh g -1 when used as a cathode material for a water-based zinc ion battery under a current density of 10 A g -1 for 5000 times, which is increased by more than 14%. In addition, the vanadium pentoxide nanowire (VE-J) of Example 1 of the present application has a specific capacity of 94.2 mAh g -1 when used as a cathode material for a water-based zinc ion battery under a current density of 10 A g -1 after 9500 times. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are included to provide a further understanding of the present application, constitute a part of the present application and the illustrative embodiments of the present application and their descriptions serve to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 is the SEM image of vanadium pentoxide raw material (a) and vanadium pentoxide nanowire (b, c) prepared in Example 1 of the present application; Figure 2 is the XRD pattern of vanadium pentoxide raw material (a) and vanadium pentoxide nanowire (b) prepared in Example 1 of the present application.

[0017] Figure 3 is the long cycle performance of vanadium pentoxide nanowire (VE-J) prepared in Example 1 of the present application under a current density of 10 A g -1 .

[0018] Figure 4 is the cycle performance of vanadium pentoxide nanowire (VE-J) prepared in Example 1 of the present application and vanadium pentoxide nanowire (VE-C) of patent CN114573027A under a current density of 10 A g -1 . DETAILED DESCRIPTION

[0019] The specific embodiments of the present application provide a preparation method of vanadium pentoxide nanowire, comprising the following steps: Step 1, dissolve vanadium pentoxide in deionized water and stir at room temperature until the solution is completely dissolved; Step 2, continue stirring after adding the template agent and surfactant to the solution prepared in Step 1; Step 3, the solution stirred in Step 2 is allowed to stand, after the solution is layered, the supernatant is discarded, and the remaining material is dried at normal pressure to obtain vanadium pentoxide nanowires.

[0020] In Step 1 above, the concentration of the vanadium pentoxide solution is controlled at 15-25 mg / mL, preferably at 18-20 mg / mL.

[0021] In Step 2 above, the template agent and surfactant are added to form vanadium pentoxide nanowires by stirring, under the premise of stirring speed of 300-500 rpm, the stirring time needs to be controlled between 8-72 h, if less than 8 h, vanadium pentoxide nanosheets are mainly formed, and if more than 72 h, the nanowire structure will be destroyed, the length will be shortened, and even the linear structure will disappear.

[0022] The template agent is selected from at least one of octylamine, ethylenediamine, propylenediamine, and hexylenediamine, which helps the formation of vanadium pentoxide nanowires, among which ethylenediamine has the relatively best effect, and the processing time of Step 2 is about 45-60 hours to form vanadium pentoxide nanowires with uniform length and thickness. In the system, the molar ratio of vanadium pentoxide, template agent, and surfactant is 5:0.1-6:0.1.

[0023] In Step 3 above, the purpose of standing is to allow the formed nanowires to naturally settle down, so that the structure is more stable.

[0024] The finally obtained vanadium pentoxide nanowires have a length of 1-5 um, and an average length of about 3 um.

[0025] In the embodiment of the application, the assembly method of the aqueous zinc ion battery is as follows: (1) Preparation of the positive electrode sheet: 175 mg of vanadium pentoxide nanowires is weighed and added to a mortar, then 50 mg of acetylene black and 25 mg of polyvinylidene fluoride (PVDF) are weighed and mixed and stirred uniformly in an appropriate amount of 1-methyl-2-pyrrolidone (NMP) solvent, then the slurry is uniformly coated on a cut titanium foil, and after vacuum drying at 80°C for 10 hours, the positive electrode sheet is obtained.

[0026] (2) Preparation of the electrolyte: 35.945 g of zinc sulfate is weighed and added to a beaker, then an appropriate amount of deionized water is added and stirred until the zinc sulfate is dissolved, then deionized water is added to make up to 50 ml, and finally the stirring is continued for 6 h to obtain a 2.5 mol / L zinc trifluoromethanesulfonate aqueous solution.

[0027] (3) Preparation of the aqueous zinc ion battery: The CR2025 type battery shell was selected, and the battery assembly sequence was positive shell-positive plate-glass fiber diaphragm-electrolyte (8-10 drops of electrolyte were dropped into the middle of the diaphragm)-negative plate (zinc plate treated by polishing)-gasket-spring plate-negative shell.

[0028] (4) Measurement of specific capacity of aqueous zinc ion battery The assembled battery was first placed for 4h, and then 10A g -1 The current density was measured.

[0029] The technical solutions in the embodiments of the present application will be described below. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0030] The experimental methods in the following examples are conventional methods, and are carried out according to the techniques or conditions described in the literature in the art or according to the product instructions, unless otherwise specified. The materials, reagents, etc. used in the following examples can be obtained from commercial channels, unless otherwise specified.

[0031] Example 1 1g of vanadium pentoxide (5.5mmol) was added to 50ml of deionized water, and after magnetic stirring at a speed of 400rpm for 3h at room temperature, 2mmol of template ethylenediamine and 0.1mmol of surfactant cetyltrimethylammonium bromide were added, and the magnetic stirring was continued at a speed of 400rpm for 48h. After the stirring was completed, the solution was transferred to a beaker and left to stand for 10min until the solution was layered, and the supernatant was poured off. The lower turbid solution was dried at 80℃ under normal pressure to obtain vanadium pentoxide nanowires. The nanowires were assembled into an aqueous zinc ion battery, and the specific capacity was measured. The battery had a specific capacity of 108.4 mAh g -1 at a current density of 10A g -1 After 9500 times at a current density of 10A g -1 , the battery had a specific capacity of 94.2 mAh g -1 .

[0032] Figure 1 and Figure 2 respectively show the SEM and XRD images of vanadium pentoxide raw material and vanadium pentoxide nanowires obtained in the present embodiment. From the SEM images, it can be seen that the vanadium pentoxide has changed from the original flaky structure ( Figure 1 (a) to a long and narrow nanobelt structure ( Figure 1 (b), (c)). The prepared samples were analyzed by XRD. As shown in the XRD pattern, the prepared sample is vanadium pentoxide.Figure 2 A strong peak appears at 2theta = 10.02°, d-spacing 8.83 A, larger than the interlayer spacing of pure V205(4.4 A). It is confirmed that the interlayer spacing of V205 increases significantly after the template intercalation. The peaks at 2theta = 20.28°, 26.10° and 21.18°, d-spacing 4.38 A, 3.41 A and 4.19 A, respectively. These values are basically consistent with the diffraction peak position of pure V205. This indicates that the intralayer crystal structure of V205 is basically unchanged, and the phase is still dominated by V205.

[0033] Figure 3 Vanadium pentoxide nanowires (VE-J) 10 Ag -1 The long cycle performance at current density shows that the initial capacity is 93.3 mAh g -1 at a current density of 10 A g -1 after 9500 times.

[0034] Example 2 1 g of vanadium pentoxide was added to 50 ml of deionized water, and after magnetic stirring at room temperature at a speed of 400 rpm for 3 h, 2 mmol of template ethylenediamine and 0.1 mmol of surfactant cetyltrimethylammonium bromide were added, and the stirring was continued at a speed of 400 rpm for 8 h. After the stirring was completed, the solution was transferred to a beaker and left to stand for 10 min until the solution was layered, and the supernatant was poured off. The lower turbid liquid was dried at 80°C under normal pressure to obtain vanadium pentoxide nanowires. The nanowires were assembled into a water-based zinc ion battery, and the specific capacity was measured. The battery had a specific capacity of 98.6 mAh g -1 at a current density of 10 A g -1 after 5000 times.

[0035] Example 3 1 g of vanadium pentoxide was added to 50 ml of deionized water, and after magnetic stirring at room temperature at a speed of 400 rpm for 3 h, 2 mmol of template ethylenediamine and 0.1 mmol of surfactant cetyltrimethylammonium bromide were added, and the stirring was continued at a speed of 400 rpm for 16 h. After the stirring was completed, the solution was transferred to a beaker and left to stand for 10 min until the solution was layered, and the supernatant was poured off. The lower turbid liquid was dried at 80°C under normal pressure to obtain vanadium pentoxide nanowires. The nanowires were assembled into a water-based zinc ion battery, and the specific capacity was measured. The battery had a specific capacity of 97.4 mAh g -1 at a current density of 10 A g -1 after 5000 times.

[0036] Example 4 1 g of vanadium pentoxide was added to 50 ml of deionized water and magnetically stirred at 400 rpm for 3 h at room temperature. Then, 2 mmol of ethylenediamine (templative agent) and 0.1 mmol of cetyltrimethylammonium bromide (surfactant) were added, and magnetic stirring was continued at 400 rpm for 24 h. After stirring, the solution was transferred to a beaker and allowed to stand for 10 min until separation occurred. The supernatant was discarded. The turbid lower layer was dried at 80 °C under normal pressure to obtain vanadium pentoxide nanowires. These nanowires were assembled into an aqueous zinc-ion battery, and their specific capacity was measured at 10 A g. -1 The battery has a current density of 100.8 mAh g after 5000 cycles. -1 Specific capacity.

[0037] Example 5 1 g of vanadium pentoxide was added to 50 ml of deionized water and magnetically stirred at 400 rpm for 3 h at room temperature. Then, 2 mmol of ethylenediamine (templative agent) and 0.1 mmol of cetyltrimethylammonium bromide (surfactant) were added, and magnetic stirring was continued at 400 rpm for 36 h. After stirring, the solution was transferred to a beaker and allowed to stand for 10 min until separation occurred. The supernatant was discarded. The turbid lower layer was dried at 80 °C under normal pressure to obtain vanadium pentoxide nanowires. These nanowires were assembled into an aqueous zinc-ion battery, and their specific capacity was measured at 10 A g. -1 The battery has a current density of 104.9 mAh g after 5000 cycles. -1 Specific capacity.

[0038] Example 6 1 g of vanadium pentoxide was added to 50 ml of deionized water and magnetically stirred at 400 rpm for 3 h at room temperature. Then, 2 mmol of ethylenediamine (template agent) and 0.1 mmol of cetyltrimethylammonium bromide (surfactant) were added, and magnetic stirring was continued at 400 rpm for 72 h. After stirring, the solution was transferred to a beaker and allowed to stand for 10 min until separation occurred. The supernatant was discarded. The turbid lower layer was dried at 80 °C under normal pressure to obtain vanadium pentoxide nanowires. These nanowires were assembled into an aqueous zinc-ion battery, and their specific capacity was measured at 10 A g. -1 The battery exhibits a capacity of 98.1 mAh g after 5000 cycles at a given current density. -1 Specific capacity.

[0039] Example 7 1 g of vanadium pentoxide was added to 50 ml of deionized water and magnetically stirred at 400 rpm for 3 h at room temperature. Then, 2 mmol of ethylenediamine (templative agent) and 0.1 mmol of cetyltrimethylammonium bromide (surfactant) were added, and magnetic stirring was continued at 400 rpm for 60 h. After stirring, the solution was transferred to a beaker and allowed to stand for 10 min until separation occurred. The supernatant was discarded. The turbid lower layer was dried at 80 °C under normal pressure to obtain vanadium pentoxide nanowires. These nanowires were assembled into an aqueous zinc-ion battery, and their specific capacity was measured at 10 A g. -1 The battery has a capacity of 109.5 mAh g after 5000 cycles at a current density. -1 Specific capacity.

[0040] Example 8 1 g of vanadium pentoxide was added to 50 ml of deionized water and magnetically stirred at 400 rpm for 3 h at room temperature. Then, 2 mmol of template agent octylamine and 0.1 mmol of surfactant hexadecyltrimethylammonium bromide were added, and magnetic stirring was continued at 400 rpm for 48 h. After stirring, the solution was transferred to a beaker and allowed to stand for 10 min until separation occurred. The supernatant was discarded. The turbid lower layer was dried at 80 °C under normal pressure to obtain vanadium pentoxide nanowires. These nanowires were assembled into an aqueous zinc-ion battery, and their specific capacity was measured at 10 A g. -1 The battery has a capacity of 96.7 mAh g after 5000 cycles at a current density. -1 Specific capacity.

[0041] Example 9 1 g of vanadium pentoxide was added to 50 ml of deionized water and magnetically stirred at 400 rpm for 3 h at room temperature. Then, 2 mmol of propylenediamine (a template agent) and 0.1 mmol of cetyltrimethylammonium bromide (a surfactant) were added, and magnetic stirring was continued at 400 rpm for 48 h. After stirring, the solution was transferred to a beaker and allowed to stand for 10 min until separation occurred. The supernatant was discarded. The turbid lower layer was dried at 80 °C under normal pressure to obtain vanadium pentoxide nanowires. These nanowires were assembled into an aqueous zinc-ion battery, and their specific capacity was measured at 10 A g. -1 The battery has a capacity of 97.4 mAh g after 5000 cycles at a current density. -1 Specific capacity.

[0042] Example 10 1 g of vanadium pentoxide was added to 50 ml of deionized water and magnetically stirred at 400 rpm for 3 h at room temperature. Then, 2 mmol of hexamethylenediamine (a template agent) and 0.1 mmol of cetyltrimethylammonium bromide (a surfactant) were added, and magnetic stirring was continued at 400 rpm for 48 h. After stirring, the solution was transferred to a beaker and allowed to stand for 10 min until separation occurred. The supernatant was discarded. The turbid lower layer was dried at 80 °C under normal pressure to obtain vanadium pentoxide nanowires. These nanowires were assembled into an aqueous zinc-ion battery, and their specific capacity was measured at 10 A g. -1 The battery has a capacity of 95.6 mAh g after 5000 cycles at a current density. -1 Specific capacity.

[0043] Comparative Example 1 1 g of vanadium pentoxide was added to 50 ml of deionized water and magnetically stirred at 400 rpm for 3 h at room temperature. Then, 2 mmol of ethylenediamine (templative agent) and 0.1 mmol of cetyltrimethylammonium bromide (surfactant) were added, and stirring was continued at 400 rpm for 30 min. After stirring, the solution was transferred to a beaker and allowed to stand for 10 min until separation occurred. The supernatant was discarded. The turbid lower layer was dried at 80 °C under normal pressure. Vanadium pentoxide retained its original layered structure, and vanadium pentoxide nanowires could not be obtained. This vanadium pentoxide was assembled into an aqueous zinc-ion battery, and its specific capacity was measured at 10 A g. -1 The battery has a capacity of 70.4 mAh g after 5000 cycles at a current density. -1 Specific capacity.

[0044] Comparative Example 2 1 g of vanadium pentoxide was added to 50 ml of deionized water and magnetically stirred at 400 rpm for 3 hours at room temperature. Then, 2 mmol of ethylenediamine (templative agent) and 0.1 mmol of cetyltrimethylammonium bromide (surfactant) were added, and stirring was continued at 400 rpm for another hour. After stirring, the solution was transferred to a beaker and allowed to stand for 10 minutes until separation occurred. The supernatant was discarded. The turbid lower layer was dried at 80°C under normal pressure. Compared to commercially available vanadium pentoxide, the layered structure was transformed into smaller, irregular nanosheets, but no banded structure was observed, and vanadium pentoxide nanowires could not be obtained. These irregular nanosheets were assembled into an aqueous zinc-ion battery, and its specific capacity was measured at 10 A g. -1 The battery has a capacity of 74.5 mAh g after 5000 cycles at a current density. -1 Specific capacity.

[0045] Comparative Example 3 1 g of vanadium pentoxide was added to 50 ml of deionized water and magnetically stirred at 400 rpm for 3 h at room temperature. Then, 1 mmol of ethylenediamine (templative agent) and 0.05 mmol of cetyltrimethylammonium bromide (surfactant) were added, and stirring continued at 400 rpm for another h. After stirring, the solution was transferred to a beaker and allowed to stand for 10 min until separation occurred. The supernatant was discarded. The turbid lower layer was dried at 80 °C under normal pressure. Compared to commercially available vanadium pentoxide, the original morphology showed decomposition, but no banded structure was observed, making it impossible to obtain vanadium pentoxide nanowires. This vanadium pentoxide was assembled into an aqueous zinc-ion battery, and its specific capacity was measured at 10 A g. -1 The battery has a capacity of 60.5 mAh g after 5000 cycles at a current density. -1 Specific capacity.

[0046] Comparative Example 4 1 g of vanadium pentoxide was added to 50 ml of deionized water and magnetically stirred at 400 rpm for 3 hours at room temperature. Then, 4 mmol of ethylenediamine (template agent) and 0.2 mmol of cetyltrimethylammonium bromide (surfactant) were added, and magnetic stirring was continued at 400 rpm for another hour. After stirring, the solution was transferred to a beaker and allowed to stand for 10 minutes until separation occurred. The supernatant was discarded. The turbid lower layer was dried at 80°C under normal pressure. An uneven vanadium pentoxide nanoribbon structure was observed, containing a small number of vanadium pentoxide nanosheets; vanadium pentoxide nanowires could not be obtained. These irregular nanoribbons were assembled into an aqueous zinc-ion battery, and its specific capacity was measured at 10 A g. -1 The battery has a current density of 38.4 mAh g after 5000 cycles. -1 Specific capacity.

[0047] Comparative Example 5 1 g of the vanadium pentoxide was added to 50 ml of deionized water and magnetically stirred at 200 rpm for 3 hours at room temperature. Then, 2 mmol of ethylenediamine (template agent) and 0.1 mmol of cetyltrimethylammonium bromide (surfactant) were added, and stirring continued at 200 rpm for 8 hours. After stirring, the solution was transferred to a beaker and allowed to stand for 10 minutes until separation occurred. The supernatant was discarded. The turbid lower layer was dried at 80°C under normal pressure to obtain heterogeneous vanadium pentoxide nanowires. These nanowires were assembled into an aqueous zinc-ion battery, and its specific capacity was measured. After 5000 cycles at a current density of 10 A g⁻¹, the battery exhibited a capacity of 62.4 mAh g⁻¹. -1 Specific capacity.

[0048] Comparative Example 6 1 g of the solution was added to 50 ml of deionized water and magnetically stirred at 1000 rpm for 3 hours at room temperature. Then, 2 mmol of the template agent ethylenediamine and 0.1 mmol of the surfactant hexadecyltrimethylammonium bromide were added, and the stirring was continued at 1000 rpm for 8 hours. After stirring, the solution was transferred to a beaker and allowed to stand for 10 minutes until separation occurred. The supernatant was discarded. The lower turbid layer was dried at 80°C under normal pressure to obtain shorter vanadium pentoxide nanowires with an average length of approximately 1 μm. These nanowires were assembled into an aqueous zinc-ion battery, and their specific capacity was measured at 10 A g. -1 The battery has a capacity of 73.9 mAh g after 5000 cycles at a current density. -1 Specific capacity.

[0049] Comparative Example 7 The method for preparing vanadium pentoxide nanoribbons was carried out according to Example 1 of patent CN114573027. Vanadium pentoxide nanoribbons were obtained and assembled into an aqueous zinc-ion battery. The specific capacity was measured at 10 A g. -1 After 5000 cycles at a current density, the battery has a capacity of 94.9 mAh g. -1 Specific capacity.

[0050] Furthermore, this invention also provides the vanadium pentoxide nanowires (VE-J) prepared in Example 1 of this patent (VE-C) and Example 1 of this invention (VE-J) 10 Ag -1 Cyclic performance at current density, such as Figure 4 As shown, when the vanadium pentoxide nanoribbons (VE-C) obtained in Example 1 of patent CN114573027A is used as a cathode material for an aqueous zinc-ion battery, at 10 A g... -1 At a current density of 94.9 mAh g after 5000 cycles. -1 The specific capacity. When the vanadium pentoxide nanowires (VE-J) obtained in Example 1 of this invention are used as cathode materials for aqueous zinc-ion batteries, at 10 A g... -1 At a current density of 108.4 mAh g after 5000 cycles. -1 The specific capacity has increased by more than 14%.

[0051] Furthermore, this invention uses Example 1 and Comparative Example 7 as examples to estimate the energy consumption of this invention compared with that of patent CN114573027. In Example 1 of this invention, the stirrer used is an MS-H280-Pro digital display heating magnetic stirrer with a total power of 515W and a heat output power of 500W. Since no heating program was used, the total stirring power is calculated as 15W. The maximum speed of this stirrer is 1500rpm, while Example 1 uses a speed of 400rpm. The power of the stirrer is proportional to the speed; therefore, the power of Example 1 is approximately 0.3W. The energy consumption is E=P×t=0.3W×48h=0.0144 kWh. Comparative Example 7 uses a KQW3200DV CNC ultrasonic cleaner with an ultrasonic input power of 150W, so the energy consumption is E=P×t=150W×4h=0.6 kWh. It can be seen that the energy requirement of this invention is significantly reduced, confirming the cost-effectiveness advantage of this invention. Furthermore, the entire preparation process of this invention generates virtually no noise, and it also significantly solves the problem of low-frequency noise.

[0052] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents. The embodiments described above merely illustrate several implementations of the invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the invention, and these all fall within the protection scope of the invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. A method for preparing vanadium pentoxide nanowires, characterized in that, Includes the following steps: Step 1: Dissolve vanadium pentoxide in deionized water and stir at room temperature until the solution is completely dissolved; Step 2: Add template agent and surfactant to the solution prepared in step 1 and continue stirring; Step 3: Let the solution after stirring in step 2 stand until the solution separates into layers. Discard the supernatant and dry the remaining substance under normal pressure to obtain vanadium pentoxide nanowires.

2. The preparation method according to claim 1, characterized in that, In step 1, the concentration of the prepared vanadium pentoxide solution is 15 mg / ml to 25 mg / ml; and / or, the stirring time is 2 to 4 hours.

3. The preparation method according to claim 1, characterized in that, In step 2, the molar ratio of vanadium pentoxide, template agent, and surfactant is 5~6:0.1~6:0.

1.

4. The preparation method according to claim 1 or 3, characterized in that, In step 2, the template agent is at least one of octylamine, ethylenediamine, propylenediamine, and hexamethylenediamine.

5. The preparation method according to claim 1 or 3, characterized in that, In step 2, the surfactant is one of sodium dodecylbenzenesulfonate, hexadecyltrimethylammonium bromide, and sodium octadecyl sulfate.

6. The preparation method according to claim 1, characterized in that, In step 2, the stirring method is magnetic stirring; preferably, the magnetic stirring speed is 300 rpm to 500 rpm, and the stirring time is 8 to 72 hours.

7. The preparation method according to claim 6, characterized in that, The stirring time is 45~60h.

8. The preparation method according to claim 1, characterized in that, In step 3, the standing time is 10-20 minutes; and / or the drying temperature is 80-120°C.

9. A vanadium pentoxide nanowire obtained by the preparation method according to any one of claims 1-8.

10. The vanadium pentoxide nanowires according to claim 9, characterized in that, The vanadium pentoxide nanowires have a length of 1~5 μm.

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