Preparation method and application of double-carbon-layer-coated nitrogen-doped polysulfide

文档序号：1907179 发布日期：2021-11-30 浏览：2次中文

阅读说明：本技术 一种双碳层包覆氮掺杂多硫化物的制备方法及应用 (Preparation method and application of double-carbon-layer-coated nitrogen-doped polysulfide ) 是由罗绍华战洋张琳王庆张亚辉闫绳学冯建李鹏伟刘忻于 2021-08-26 设计创作，主要内容包括：本发明提供了一种双碳层包覆氮掺杂多硫化物,属于新能源储能材料领域,其晶体形状为立方体,分子式为Fe-(4.005)Ni-(4.995)S-(8)@NDC,在双碳层包覆下,双金属硫化物Fe-(4.005)Ni-(4.995)S-(8)的形状为结构完好的圆形颗粒。本发明制备得到的Fe-(4.005)Ni-(4.995)S-(8)@NDC电化学性能良好、双碳包覆效果显著、结晶性良好并且本征反应活性高；应用于锂空气电池之中拥有较强的循环及倍率性能,且制备方法为一步煅烧,适合大规模生产。(The invention provides a double-carbon-layer-coated nitrogen-doped polysulfide, which belongs to the field of new energy storage materials, and the crystal shape of the polysulfide is cubic, and the molecular formula of the polysulfide is Fe 4.005 Ni 4.995 S 8 @ NDC, bimetallic sulfide Fe coated with a layer of a double carbon 4.005 Ni 4.995 S 8 Is in the form of round particles with intact structure. Fe prepared by the invention 4.005 Ni 4.995 S 8 The @ NDC has good electrochemical performance, obvious double-carbon coating effect, good crystallinity and high intrinsic reaction activity; applied in lithium air batteryHas stronger cycle and rate performance, and the preparation method is one-step calcination and is suitable for large-scale production.)

1. A double-carbon-layer coated nitrogen-doped polysulfide is characterized in that the crystal shape is cubic, and the molecular formula is Fe_4.005Ni_4.995S₈@ NDC, bimetallic sulfide Fe coated with a layer of a double carbon_4.005Ni_4.995S₈Is in the form of round particles with intact structure.

2. The double-carbon-layer-coated nitrogen-doped polysulfide as claimed in claim 1, characterized in that it is produced by the following method:

(1) synthesizing Ni-Fe PBA Prussian blue analogue precursor powder by using a coprecipitation method;

(2) adding the precursor powder into alkaline tris (hydroxymethyl) aminomethane, fully mixing, then adding dopamine hydrochloride, continuing stirring to complete carbon coating, and performing suction filtration to collect a Ni-Fe PBA @ PDA product, namely a Ni-Fe PBA Prussian blue analogue precursor;

(3) taking the carbon-coated Ni-Fe PBA Prussian blue analogue precursor as a metal source, taking sulfur powder as a sulfur source, fully mixing the metal source and the sulfur source, and calcining the mixture in an inert gas mixed reducing atmosphere to vulcanize the material and perform secondary carbon coating to obtain the carbon-coated Ni-Fe PBA Prussian blue analogue precursorTo said Fe_4.005Ni_4.995S₈@ NDC cathode material.

3. The dual-carbon-layer-coated nitrogen-doped polysulfide as claimed in claim 2, wherein the preparation method of step (1) is specifically:

dissolving 3-8mmol of nickel chloride hexahydrate and 4.5-12mmol of sodium citrate dihydrate in 150-250mL of deionized water to obtain a solution A;

subsequently, 2-6mmol of K₃Fe(CN)₆The 150-250mL aqueous solution is slowly dropped into the solution A and is stirred vigorously for 3-10 minutes;

aging at room temperature for 20-48 h, centrifugally collecting the Ni-Fe bimetallic Prussian blue analogue cube, washing with deionized water and ethanol for 3 times, and finally keeping in an oven at 60-80 ℃ for 20-30 h to obtain precursor powder of Ni-Fe PBA.

4. The dual-carbon-layer-coated nitrogen-doped polysulfide as claimed in claim 2, wherein the preparation method of step (2) comprises:

taking 0.1-0.2g of Ni-Fe PBA Prussian blue analogue precursor powder, and uniformly dissolving the precursor powder in 300-500ml of trihydroxymethylaminomethane solution with the pH value of 8-9 by ultrasonic treatment for 0.5-2 hours;

after stirring and ultrasonic treatment for 30-60 minutes, 40-120mg of dopamine hydrochloride is added, stirring is continued for 4-8 hours, and then the Ni-Fe PBA @ PDA product is collected by suction filtration.

5. The dual-carbon-layer-coated nitrogen-doped polysulfide as claimed in claim 2, wherein the preparation method of step (3) comprises:

the using amount of the carbon-coated Ni-Fe PBA @ PDA is 2g-3g, the using amount of the sulfur powder is 8g-12g, the two are fully mixed and then placed in a closed porcelain boat, then the porcelain boat is transferred into a tubular furnace, and inert gas and reducing gas H are added₂Calcining under the protection of (1); the temperature rise rate of the calcination is 1-10 ℃/min, the residence temperature of the calcination is 350-450 ℃, and the heat preservation time is 1-2 h;

before calcination, inert gas and hydrogen are required to be introduced into the tube furnace for 0.5-1.5h in advance, the tube is initially in an inert and reducing gas environment, wherein the proportion of the hydrogen is 3-10 wt%, and the inert gas is argon or nitrogen.

6. Use of the double-carbon-layer-coated nitrogen-doped polysulfide according to any one of claims 1 to 5 for the preparation of a positive electrode material for a lithium-air battery.

7. The application of claim 6, wherein the preparation method of the cathode material comprises the following steps:

coating the double-carbon layer with nitrogen-doped polysulfide Fe_4.005Ni_4.995S₈The @ NDC is loaded on the carbon paper, and the loading amount is 0.5-0.8mg/cm²(ii) a The conductive agent selected in the preparation process of the cathode material is acetylene black, and the Fe_4.005Ni_4.995S₈The mass ratio of the @ NDC to the conductive agent is 1:1-1:2, and meanwhile, a proper amount of binder is added.

Technical Field

The invention relates to the field of new energy storage materials, in particular to Fe_4.005Ni_4.995S₈A @ NDC anode catalytic material, a preparation method and application thereof.

Background

The lithium-air battery provides a brand-new solution for the development of the next-generation energy storage and conversion device, and the theoretical energy density of the system is high (3500 Wh kg)^-1) The energy density of the lithium ion battery is not only 10 times of that of the lithium ion battery used traditionally, but also can be compared with gasoline. However, the cycle life, reaction kinetics, and cycle efficiency of the cell are severely hampered by a number of side reactions that are confined within the system. Therefore, in recent years, extensive research has been devoted to designing a highly efficient cathode catalyst to reduce the overpotential of the system and suppress the occurrence of side reactions.

The reaction activation energy of ORR and OER processes can be effectively reduced by developing a reasonable anode catalyst, so that the over potential of charge and discharge is reduced, and the polarization of an electrode is relieved. Among them, the discovery and synthesis of metal-organic framework Materials (MOFs) and the materials prepared by using the MOFs as a template have incomparable advantages compared with the materials prepared by a common method, such as more active sites, higher specific surface area, more appropriate element content and the like. The technology for preparing the new material by taking the metal-organic framework as the template hopefully realizes the commercialization of the lithium-air battery as soon as possible.

However, the energy storage performance of most of the currently developed lithium-air batteries still cannot meet the requirements of people, such as low cycle life, large overpotential, nucleophilic attack of singlet oxygen, and the like.

For example, reference 1(Metal-organic frame-derived cobalt nanoparticles defined in nitrogen-doped carbon polysilicon networks as high-performance binary electronically available catalyst for rechargeable Li-O₂The Co @ NC positive electrode material described in batteries, Shun-zhi Yu et al, Journal of Power Sources 453(2020)227899) did not take any method to improve the intrinsic conductivity of the material, and the material in reference 1 was not protected against the attack of superoxide radical in the reaction without the protection of the core-shell structure, resulting in a rapid decay of the cycle life.

As another example, in reference 2(Nitrogen-Coordinated [email protected] NC Yolk-Shell Polyhedrons Catalysts removed from a Metal-Organic Framework for a high purity recovery Li-O)₂Battery, Yang Zhan et al, ACS appl. Mater. interfaces 2021,13,17658-17667), although vulcanization treatment is performed, the intrinsic reactivity of the material is improved, but the irregular morphology cannot well resist the external mechanical stress applied in the OER/ORR process, so that the morphology cannot be well maintained.

In summary, in order to further improve the cycle stability and capacity of the lithium-air battery, it is of great significance to research the positive electrode catalytic material of the lithium-air battery.

Disclosure of Invention

In view of the above problems in the prior art, the present application provides a method for preparing a double-carbon-layer-coated nitrogen-doped polysulfide and applications thereof. Fe prepared by the invention_4.005Ni_4.995S₈The @ NDC has good electrochemical performance, obvious double-carbon coating effect, good crystallinity and high intrinsic reaction activity; the lithium air battery has strong cycle and rate performance when being applied to the lithium air battery, and the preparation method is one-step calcination and is suitable for large-scale production.

The technical scheme of the invention is as follows:

a nitrogen-doped polysulfide coated with double carbon layers has a cubic crystal shape and a molecular formula of Fe_4.005Ni_4.995S₈@ NDC, bimetallic sulfide Fe coated with a layer of a double carbon_4.005Ni_4.995S₈Is in the form of round particles with intact structure.

The preparation method of the double-carbon-layer-coated nitrogen-doped polysulfide comprises the following steps:

(1) synthesizing Ni-Fe PBA Prussian blue analogue precursor powder by using a coprecipitation method;

The preparation method of the step (1) comprises the following specific steps:

dissolving 3-8mmol of nickel chloride hexahydrate and 4.5-12mmol of sodium citrate dihydrate in 150-250mL of deionized water to obtain a solution A;

subsequently, 2-6mmol of K₃Fe(CN)₆The 150-250mL aqueous solution is slowly dropped into the solution A and is stirred vigorously for 3-10 minutes;

The preparation method of the step (2) comprises the following specific steps:

The preparation method of the step (3) comprises the following specific steps:

The invention also provides application of the double-carbon-layer-coated nitrogen-doped polysulfide in preparation of a positive electrode material of a lithium-air battery.

The preparation method of the cathode material comprises the following steps:

Preferably, in the step (1), the amount of the nickel chloride hexahydrate and the sodium citrate dihydrate is 1:1.5, wherein the addition amount of the nickel chloride hexahydrate is 3mmol, and the ratio of the nickel chloride hexahydrate and the sodium citrate dihydrate is determined to be favorable for the prussian blue analogue precursor to form a cube shape.

Preferably, in step (1), deionized water is added to solution A in an amount of 100 ml.

Preferably, in step (1), 2mmol of K will be contained₃Fe(CN)₆100mL of deionized water solution was added dropwise (dropping time 30 minutes) to the solution A, and the reaction was complete.

Preferably, in the step (1), dropwise addition is carried outK₃Fe(CN)₆After the completion of the stirring, the stirring was continued at a rotation speed of 400-600rpm/min for 5 min.

Preferably, in step (1), the aging time is 24 hours and the temperature is controlled at 25 ℃.

Preferably, in step (1), 8000 turns of centrifugation is adopted for 5 minutes, and then washing is carried out twice by using deionized water and once by using absolute ethyl alcohol (the rotation speed and the time are both 8000 turns and 5 minutes).

Preferably, in step (1), the collected precursor is kept in an oven at 70 ℃ for 12 hours.

Preferably, in the step (2), the ultrasonic treatment time is 1 hour.

Preferably, in step (2), 100mg of the precursor is taken and dissolved in 120ml of a tris solution having a pH of 8.5.

Preferably, in step (2), the dopamine hydrochloride is added in an amount of 80mg, and the mixture is stirred for 6 hours at a rotation speed of 400-600 rpm/min.

Preferably, in step (2), the Ni-Fe PBA @ PDA product is collected using vacuum filtration.

Preferably, in step (2), the collected product is kept in an oven at 70 ℃ for 12 hours.

Preferably, in the step (3), the ratio of Ni-Fe PBA @ PDA to sulfur powder is 1:4, and the mass of the taken sulfur powder is 8 g.

Preferably, in the step (3), the furnace atmosphere used is argon-hydrogen mixture (H)₂Concentration 5 wt%).

Preferably, in the step (3), before the start of the temperature rise, the argon-hydrogen mixed gas is introduced into the furnace for 1 hour.

Preferably, in the step (3), the calcination process is carried out at 3 ℃ for min^-1Heating to 400 ℃ at the heating rate, keeping for 1h, enabling the material to be completely vulcanized by using argon as the gas atmosphere in the furnace, and naturally cooling to obtain Fe_4.005Ni_4.995S₈@NC。

The beneficial technical effects of the invention are as follows:

the double-carbon-layer-coated nitrogen-doped polysulfide prepared by the method has the advantages of uniform particle size, good shape maintenance, basically maintained particle size of about 100nm, and good appearance capable of maintaining the corresponding cubic shape. Under the double-carbon-layer coating, the double-metal sulfide presents perfect round small particles and has no obvious agglomeration phenomenon. The preparation method has the advantages of easily obtained raw materials, simple and convenient operation and mild conditions, and is favorable for industrialized large-scale production.

Compared with sulfide prepared by the traditional method, the Fe prepared by the invention_4.005Ni_4.995S₈The @ NDC positive electrode material has a larger specific surface area, can be well inserted into and removed from active sites by lithium air, contains rich nitrogen and sulfur elements, can effectively improve the conductivity of the material, and can be used for preparing the positive electrode material of the lithium air battery at the power of 0.05mA cm^-2The lower cycle is 210 rounds.

Although Fe has been described in the prior art_xNi_yS_zFor example, CN20201010363.7 (preparation method of sodium ion battery cathode material with graphene coated with nickel-iron bimetallic sulfide) provides (NiFe)₉S₈The production methods of (1) above, however, are different in the structural formula (phase) and also different in the vulcanization means and the calcination atmosphere.

Compared with the prior art, the performance of the catalyst is remarkably improved, for example, in a comparison document 1, the OER/ORR catalytic capability of a Co-N-C bond is weaker than the synergistic catalytic effect of Fe-N-C and Ni-N-C bonds in the invention; compared with the reference 2, the material of the invention can maintain a good cubic structure, can effectively bear and disperse stress from all parties, and can ensure the effective shuttling efficiency of electrons, while the reference 2 does not have the characteristics, so that the anode material reaches an electrolyte decomposition window too early during reaction, and excessive non-conductive reaction product lithium peroxide is accumulated on a three-phase reaction interface in the lithium-air battery, so that the internal electrochemical reaction is terminated.

In practice, the applicant has found that in order to obtain the phases described in the present application successfully, the gas composition and the content inside the furnace must be effectively controlled during calcination. In the previous failed experiments, it was found that the protection effect cannot be effectively realized if only Ar gas in the calcination of CN20201010363.7 is used for protectionOctasulfide is obtained, and in many cases the phase obtained is FeNiS₂And the good morphology cannot be maintained; if the phase is obtained stably, additional reducing gas needs to be introduced, otherwise, the vulcanization efficiency is low, and the requirement of improving the intrinsic reaction activity of the material by vulcanization cannot be met.

CN20201103040.6 carbon-coated transition metal oxide based on Prussian blue analogue, and preparation method and application thereof, mainly describes preparation of transition metal oxide, however, in the invention, Prussian blue analogue is used as precursor for the first time, and temperature and furnace body atmosphere in sample vulcanization process are carefully regulated and controlled, so that Fe in crystal form is prepared for the first time_4.005Ni_4.995S₈The transition metal sulfide has better conductivity than transition metal oxide when actually applied to energy storage and conversion devices, and can better bear volume change generated in the charging and discharging processes.

Drawings

FIG. 1 is an XRD pattern of the Ni-Fe PBA Prussian blue analogue precursor prepared in example 1.

Fig. 2 is an XRD spectrum of the product prepared in comparative example 1.

Figure 3 is an XRD pattern of the product prepared in example 3.

Fig. 4 is an XRD pattern of the product prepared in comparative example 2.

Fig. 5 shows SEM pictures of (a) and (b) a Ni-Fe PBA prussian blue analog precursor (i.e., example 1) and a dopamine-coated product (i.e., example 2), respectively, fig. (c) is a SEM picture of a product prepared in comparative example 1, and fig. (d) is a SEM picture of a dopamine-coated vulcanized product of a Ni-Fe PBA prussian blue analog precursor (i.e., example 3).

FIG. 6 shows Fe obtained in example 3_4.005Ni_4.995S₈TEM pictures of @ NDC at different magnifications.

FIG. 7 shows Fe obtained in comparative example 1_4.005Ni_4.995S₈@ NC material as the anode of the lithium-air battery at 0.05mA cm^-2Constant current charging and discharging curve diagram.

FIG. 8 shows Fe prepared in example 3_4.005Ni_4.995S₈@ NDC material as anode of lithium-air battery at 0.05mA cm^-2Constant current charging and discharging curve diagram.

FIG. 9 shows Fe obtained in comparative example 2_0.24Ni_0.76S₂@ NDC material as positive electrode of lithium-air battery at 0.05mA cm^-2Constant current charging and discharging curve diagram.

FIG. 10 shows Fe obtained in example 3_4.005Ni_4.995S₈@ NDC as positive electrode of lithium-air battery at 0.05mAcm^-2Capacity cycling graph of (a).

FIG. 11 shows Fe prepared in example 3_4.005Ni_4.995S₈The nitrogen desorption curve for the @ NDC sample.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

synthesizing Ni-Fe-PBA cubic nanocrystals with uniform size by a coprecipitation method: nickel chloride hexahydrate (3mmol) and sodium citrate dihydrate (4.5mmol) were dissolved in 100mL of deionized water to give solution A. Subsequently, 2mmol of K₃Fe(CN)₆Was slowly dropped into the solution A, and stirred vigorously for 5 minutes. After aging for 24 hours at room temperature, the Ni-Fe-PBA nanocubes were collected by centrifugation (washed 3 times with deionized water and ethanol) and finally kept in an oven at 70 ℃ for 12 hours to obtain precursor powder of Ni-Fe PBA.

Example 2:

100mg of Ni-Fe PBA precursor powder was taken and uniformly dissolved in 120ml of a tris solution (pH 8) by sonication for 1 hour. After stirring and ultrasonic treatment for 60 minutes, adding 80mg of dopamine hydrochloride, continuously stirring for 6 hours, performing suction filtration and collection, and finally keeping in an oven at 70 ℃ for 12 hours to obtain a Ni-Fe PBA @ PDA product.

Example 3:

weighing 2g of prepared Ni-Fe-PBA @ PDA and 8g of sulfur powder, and fully grinding. The mixture was placed in a corundum crucible. Before calcination, inert gas and hydrogen are required to be introduced into the tube furnace in advance for 1H, the tube is initially in an inert and reducing gas environment, and then the atmosphere is H₂/Ar(5wt％H₂) At 3C min in the environment^-1The slope of (2) was subjected to primary vulcanization at 400 ℃ for 2 h. Naturally cooling to room temperature to obtain Fe_4.005Ni_4.995S₈@ NDC sample.

Comparative example 1: 2g of Ni-Fe-PBA prepared in example 1 and 8g of sulfur powder were weighed and sufficiently ground. The mixture was placed in a corundum crucible. Then, at H₂/Ar(5wt％H₂) At 3C min in the environment^-1The slope of (2) was subjected to primary vulcanization at 400 ℃ for 2 h. Naturally cooling to room temperature to obtain Fe_4.005Ni_4.995S₈@ NC sample.

Comparative example 2: 1g of Ni-Fe-PBA @ PDA prepared in example 1 and 4g of sulfur powder were weighed and sufficiently ground. The mixture was placed in a corundum crucible. Then, in Ar environment at 3C min^-1The slope of (2) was subjected to primary vulcanization at 400 ℃ for 2 h. Naturally cooling to room temperature to obtain Fe_0.24Ni_0.76S₂@ NDC sample.

The properties of the products prepared in examples 1 to 3 and comparative examples 1 and 2 will be described with reference to the accompanying drawings.

FIG. 1 is an XRD pattern of Ni-Fe PBA Prussian blue analogue precursor obtained in example 1, the diffraction peak position of the precursor can perfectly correspond to PDF card #00-46-0906, and the successful synthesis of the NiFe PBA precursor is confirmed.

Fig. 2 is an XRD spectrum of the product obtained in comparative example 1. Under the calcining atmosphere of argon and reducing gas hydrogen, Fe with good crystalline phase is obtained_4.005Ni_4.995S₈The crystal phase shows that the nickel octasulfide iron-based composite material is successfully prepared, and the composite material is Fe in the attached drawing of the specification_4.005Ni_4.995S₈And (4) showing.

Figure 3 is an XRD pattern of the product obtained in example 3. Also, Fe having a good crystal phase was obtained_4.005Ni_4.995S₈The @ NC crystalline phase.

FIG. 4 is an XRD pattern of the product obtained in comparative example 2, said composite material being Fe in the drawing of the specification_0.24Ni_0.76S₂And (4) showing.

Fig. 5 is SEM pictures of (a) and (b) a Ni-Fe PBA prussian blue analog precursor (i.e., example 1) and a dopamine-coated (i.e., example 2), respectively, fig. (c) is a SEM picture of a product of comparative example 1, and fig. (d) is a SEM picture of a sulfurized product of the Ni-Fe PBA prussian blue analog precursor coated with dopamine (i.e., example 3). The comparison shows that the vulcanized product crystal coated with dopamine keeps a good cubic core-shell structure, and the crystal grain size is uniform; while the calcination product of the Ni-Fe PBA Prussian blue analogue precursor without dopamine coating can not keep good cubic morphology.

FIG. 6 shows Fe at different magnifications_4.005Ni_4.995S₈TEM picture of @ NDC. It is observed that it is clear first in fig. 6(a) that the sample retains a good cubic structure after vulcanization. FIG. 6(b) clearly shows that Fe is distributed in the structure_4.005Ni_4.995S₈The nano particles and the coated carbon layer are uniformly coated on the surface of the nano particles and correspond to SEM images of the nano particles, so that the original structure of the precursor coated with dopamine cannot be damaged by vulcanization at the temperature and in the atmosphere, and a good core-shell structure is formed to establish a channel for mass transfer of lithium ions.

FIG. 7 shows Fe obtained in comparative example 1_4.005Ni_4.995S₈@ NC material as the anode of the lithium-air battery at 0.05mA cm^-2Constant current charging and discharging curve diagram. FIG. 8 shows Fe prepared in example 3_4.005Ni_4.995S₈@ NDC material as anode of lithium-air battery at 0.05mA cm^-2Constant current charging and discharging curve diagram. Comparative example the first time of a single carbon coated sulphide can be clearly observed in both figuresThe discharge capacity is 12014.2mAh g^-1However, the double-carbon coated sulfide shows higher discharge capacity (22873.12mAh g) as the positive electrode material of the lithium-air battery^-1) The dopamine coating is proved to be effective in improving the catalytic efficiency of the cathode material to a certain extent.

FIG. 9 shows Fe obtained in comparative example 2_0.24Ni_0.76S₂@ NDC material as positive electrode of lithium-air battery at 0.05mA cm^-2Constant current charging and discharging curve diagram. Where the first discharge capacity of the single carbon-coated disulfide was clearly observed to be 6987.7mAh g^-1And the specific discharge capacity is far lower than that of octasulfide.

FIG. 10 shows Fe obtained in example 3_4.005Ni_4.995S₈@ NDC as positive electrode of lithium-air battery at 0.05mAcm^-2Capacity cycling graph of (a). The specific capacity of limited cycle charge and discharge is 500mAh g^-1After 210 cycles of stable cycling, the working voltage of the lithium-air battery can still be kept within the normal range of 2.0-4.5V, so that the cathode material as the cathode material of the lithium-air battery has very good cycling stability which exceeds the similar level of the lithium-air battery.

FIG. 11 shows Fe prepared in example 3_4.005Ni_4.995S₈The nitrogen desorption curve for the @ NDC sample. From the figure, the sample basically presents an IV-type isotherm, and shows that the coexistence of micropores and mesopores of the material can effectively carry charge transfer, increase the active sites of the material and improve the catalytic efficiency.

Comparative example 3: the results of comparing the data of the two references provided in the background with the product prepared in example 3 in terms of the catalytic performance of the cell are shown in table 1.

The preparation method of the battery comprises the following steps: coating the double-carbon layer with nitrogen-doped polysulfide Fe_4.005Ni_4.995S₈The @ NDC is loaded on the carbon paper, and the loading amount is 0.6mg/cm²(ii) a The conductive agent selected in the preparation process of the cathode material is acetylene black, and the Fe_4.005Ni_4.995S₈@ NDC conductive agent and adhesiveThe mass ratio of the agent is 1:1:1, and a proper amount of binder is added.

TABLE 1

While the embodiments of the present invention have been disclosed above, it is not limited to the applications listed in the description and embodiments, but is fully applicable to various fields suitable for the present invention, and it will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principle and spirit of the present invention, and therefore the present invention is not limited to the specific details without departing from the general concept defined in the claims and the scope of equivalents thereof.

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Preparation method and application of double-carbon-layer-coated nitrogen-doped polysulfide

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