CN112054174A - Potassium ion battery negative electrode material and preparation method and application thereof - Google Patents

Potassium ion battery negative electrode material and preparation method and application thereof Download PDF

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CN112054174A
CN112054174A CN202010936185.2A CN202010936185A CN112054174A CN 112054174 A CN112054174 A CN 112054174A CN 202010936185 A CN202010936185 A CN 202010936185A CN 112054174 A CN112054174 A CN 112054174A
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hcp
potassium ion
ion battery
cose
negative electrode
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蒋青青
王琳
胡军成
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South Central Minzu University
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South Central University for Nationalities
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention belongs to the technical field of electrode materials, and particularly relates to a potassium ion battery cathode material, and a preparation method and application thereof. The invention firstly treats a metal organic framework compound ZIF-8@ ZIF-67 with a core-shell structure in high-temperature inert gas to obtain multi-level carbon-coated metal particles, then mixes the multi-level carbon-coated metal particles with selenium powder, and then prepares multi-level carbon-coated CoSe through high-temperature calcination treatment2The material can be used as a negative electrode material of a potassium ion battery. The multi-stage carbon structure in the cathode material can improve the conductivity, provide large specific surface area and larger interlayer spacing and facilitate the intercalation of potassium ionsAnd de-intercalation. The synthesis process of the cathode material has the advantages of safety, controllability, high operability, short period, simple and easily-obtained raw materials used in experiments and the like, and the cathode material has excellent electrochemical performance and can meet the requirements of high specific capacity, excellent long cycle performance and high rate performance of a potassium ion battery.

Description

Potassium ion battery negative electrode material and preparation method and application thereof
Technical Field
The invention belongs to the technical field of electrode materials, and particularly relates to a potassium ion battery cathode material, and a preparation method and application thereof.
Background
In recent years, environmentally-friendly renewable energy sources such as solar energy and wind energy are greatly developed, but due to the instability of the renewable energy sources, the renewable energy sources cannot be directly incorporated into a power grid, and the reliability and the utilization rate need to be improved through energy conversion and storage. The chemical power supply is characterized by convenient carrying, low price, environmental protection and the like, so that the chemical power supply becomes one of the energy storage systems with the most application prospect. In recent years, potassium ion batteries have attracted considerable attention in recent years due to their low cost, fast ionic conductivity in electrolytes, high operating voltage, low standard redox potential (-2.93V versus standard electrode potential) close to potassium, and the like. However, the research on the potassium ion battery is still in the beginning. The development of large-scale long-cycle-life potassium ion batteries is a development direction, however, the development of potassium electric cathode materials suitable for mass production is a very critical field. The biggest challenge of the potassium ion battery cathode material is that the potassium ion has large radius, large stress in the charging and discharging process and large volume change, so that the stability of the potassium ion battery cathode material is reduced, and the electrochemical performance is poor.
The negative electrode material of the potassium ion battery mainly comprises other carbon-based materials such as graphite carbon, hard carbon, soft carbon and the like, alloys, metal oxides and the like. The graphite as the anode material has the main problem that the volume expansion in the charging and discharging process is as high as about 61%, and the heteroatom doping can effectively improve the theoretical capacity and improve the cycling stability. Generally speaking, metal and alloy materials have larger theoretical capacity than carbon materials and higher potassium insertion potential, but have larger stress in the charging and discharging process and larger volume change, so that the stability of the materials is reduced, the electrochemical performance is poor, and the transition metal compound is compounded with the carbon materials, so that the structural stability and the material conductivity can be improved, and the problem of poor electrochemical performance is effectively solved.
Therefore, the potassium storage performance of the transition metal compound and carbon composite material has a great research space. The development and optimization of other simple and easy preparation process methods have important practical significance for preparing the potassium ion battery cathode material with high cycle capacity and rate capability.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide potassiumAn ion battery cathode material, a preparation method and application thereof. The potassium ion battery cathode material is multi-stage carbon-coated CoSe2Abbreviated as CoSe2@ HCP, the preparation method of which comprises the following steps:
(1) heating a metal organic framework compound ZIF-8@ ZIF-67 with a core-shell structure in an inert gas (nitrogen or argon) at a heating rate of 1-20 ℃/min to 650-950 ℃, calcining for 2-6 h to obtain black powder, washing (acid leaching and water washing to neutrality), and drying to obtain a multi-stage carbon-coated metal particle cobalt which is marked as Co @ HCP;
preferably, the step (1) calcination process is as follows: heating to 800-950 ℃ at a heating rate of 1-5 ℃/min and calcining for 3-4 h;
more preferably, the step (1) calcination process is as follows: calcining at 920 ℃ for 3 h;
(2) mixing the Co @ HCP obtained in the step (1) with selenium powder, heating to 650-800 ℃ at a heating rate of 1-20 ℃/min in a non-oxidizing atmosphere (one or more selected from nitrogen, argon, hydrogen and ammonia), and calcining for 2-6 h to obtain the multi-stage carbon-coated cobalt selenide, which is marked as CoSe2@HCP。
Preferably, the step (2) calcination process is as follows: heating to 650-700 ℃ at a heating rate of 1-5 ℃/min and calcining for 3-4 h;
more preferably, the step (2) calcining process is as follows: calcining at 650 ℃ for 3 h.
Further, the step (1): the core and the shell of the metal organic framework compound ZIF-8@ ZIF-67 with the core-shell structure are all dodecahedron structures, the surface is smooth, and the particle size of the ZIF-8@ ZIF-67 is 0.5-5 mu m.
Further, the step (1): in a metal organic framework compound ZIF-8@ ZIF-67 with a core-shell structure, the ratio of ZIF-8: the molar ratio of ZIF-67 is 1 (1-10), preferably 1 (1-3), and more preferably 1: 1.
Further, the step (1): the washing steps are as follows: soaking in dilute acid solution, and washing with water until the filtrate is neutral (pH 7); preferably, the washing step is: soaking in 1-5 mol/L sulfuric acid for 12-24 h, and then washing with water until the pH value of the filtrate is 7.
Further, the step (2): the mass ratio of Co @ HCP to selenium powder (1-3): 1, preferably, mixing the components in a mass ratio of 1:1 and mixing.
Further, the step (2): and mixing the Co @ HCP and the selenium powder for 0.5-20 h in a mixing mode of manual grinding and/or dry ball milling.
Preferably, the step (2): and mixing the Co @ HCP and the selenium powder for 2-4h by dry ball milling.
Further, the CoSe obtained in the step (2)2The multi-stage carbon structure in the @ HCP is a hollow polyhedral carbon structure coated by a nitrogen-doped carbon nanotube.
The above CoSe2The material is applied to the potassium ion battery as the negative electrode material, and particularly applied to the potassium ion button battery, the negative electrode material of the potassium ion button battery comprises the negative electrode material CoSe2@ HCP, conductive agent and binder in a mass ratio of CoSe2@ HCP: conductive agent: the adhesive is 50-80:10-25:5-15, and the preferred mass ratio is 70:20: 10.
Further, the conductive agent is ketjen black.
Further, the binder is polyvinylidene fluoride.
Further, the above CoSe2The @ HCP material is applied to the preparation of the potassium ion button cell as a negative electrode material, and comprises the following steps: (1) the preparation method of the anode material comprises the following steps:
mixing CoSe2The method comprises the following steps of @ HCP material, conductive agent and adhesive are dispersed in N-methylpyrrolidone (NMP) solvent, the mixture is fully mixed to form bright and uniform paste, then the paste is uniformly coated on copper foil on a coating machine to serve as an electrode slice, and finally the electrode slice is dried and pressed to obtain a potassium ion battery negative electrode wafer;
further comprising: (2) the method comprises the following steps of assembling the potassium ion button cell:
and (2) taking the negative electrode wafer prepared in the step (1) as a battery negative electrode, taking metal potassium as a battery positive electrode, taking an electrolyte as a 3mol/L potassium bis (fluorosulfonyl) imide solution (the solvent of the solution is a mixed solution of ethylene carbonate and dimethyl carbonate with the same volume), and taking a diaphragm as a polypropylene membrane.
Further, the above CoSe2@ HCP materialsThe potassium ion button cell prepared by using the material as a negative electrode material has a discharge voltage platform of 1.3-1.7V (vs.K +/K) within the charge-discharge voltage range of 0.01V-3.0V (vs.K +/K) after circulating for 60 circles.
The invention firstly treats a metal organic framework compound ZIF-8@ ZIF-67 with a core-shell structure in high-temperature inert gas to obtain multi-level carbon-coated metal particles, and then selenizes the multi-level carbon-coated metal particles to obtain multi-level carbon-coated CoSe2The material is used as the negative electrode material of the potassium ion battery. The multilevel carbon structure in the cathode material can improve the conductivity, provide a large specific surface area and a large interlayer spacing, and facilitate the intercalation and de-intercalation of potassium ions.
Compared with the prior art, the invention has the advantages and beneficial effects that:
(1) creatively explores the multi-stage carbon-coated CoSe2The CoSe is influenced by the factors of the composite material preparation process, the raw material proportion, the calcination time, the sintering atmosphere, the sintering temperature, the heating rate and the like2Effects of the synthesis of @ HCP.
(2) Synthetic CoSe2@ HCP by application to a potassium ion battery, we obtained synthesis conditions for an electrode material that can achieve more excellent potassium storage performance.
(3) Compared with the prior potassium storage research, the preparation method is safer and controllable, has high operability and shorter period, and the raw materials used in the experiment are simple and easy to obtain.
(4) In the application of the potassium ion battery, the cycle performance and the rate performance which are more excellent than those reported in the past are obtained. Under the condition of 100mA/g charge and discharge, the capacity can reach 410mAh/g, and after 80 times of circulation, the capacity is not obviously changed; under the condition of charging and discharging of 500mA/g, the capacity can reach 236mAh/g, and after 100 times of circulation, the capacity is not obviously changed. The material shows excellent rate performance when charged and discharged under the current density of 100, 200, 500, 1000, 2000 and 5000 mA/g. The capacity was less attenuated as the current density increased, and when the current density was restored to 100mA/g, the original capacity was restored.
(5) The doping of nitrogen elements in the multilevel carbon can improve the conductivity of the material, and part of N elements can also provide coordination sites to increase the capacity of the potassium ion battery.
Drawings
FIG. 1 shows CoSe prepared according to the present invention2@ HCP product, wherein the drawing (a) is SEM drawing of ZIF-8, the drawing (b) is SEM drawing of ZIF-8@ ZIF-67, and the drawing (c-f) is CoSe2SEM photograph of @ HCP, in which (g-i) is CoSe2TEM picture of @ HCP, where (j) is CoSe2@ HCP EDS-mapping pictures.
FIG. 2 shows CoSe prepared by the present invention2@ HCP XRD pattern of material.
FIG. 3 is a graph showing the charge and discharge cycle performance of the potassium battery prepared according to the present invention at a current density of 100 mA/g.
Fig. 4 is a graph of rate performance of the potassium battery prepared by the present invention.
FIG. 5 is a graph showing the charge-discharge cycle performance of the potassium battery prepared by the present invention under a large current of 500 mA/g.
Fig. 6 is an impedance test chart of the potassium battery manufactured by the present invention.
Fig. 7 is a discharge voltage diagram of a potassium battery manufactured according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples below so that those skilled in the art can more clearly understand the present invention. The following should not be construed as limiting the scope of the claimed invention.
Example 1: negative electrode material CoSe2Preparation of @ HCP
Synthesis of ZIF-8: 5.95g (0.02mol) of zinc nitrate hexahydrate and 6.16g (0.075mol) of 2-methylimidazole were dissolved in 150mL of methanol, respectively, the 2-methylimidazole solution was poured into the zinc nitrate solution, and after stirring for 24 hours, the precipitate was collected by centrifugation, washed with methanol and centrifuged 3 times, and then dried under vacuum at 60 ℃ for 12 hours to obtain ZIF-8, whose SEM photograph is shown in FIG. 1 (a).
Synthesis of ZIF-8@ ZIF-67: 0.5g of ZIF-8 was dispersed in 100mL of methanol. 5.82g of cobalt nitrate hexahydrate (0.02mol) and 6.16g (0.075mol) of 2-methylimidazole were dissolved in 100mL of methanol, respectively. The cobalt nitrate solution was poured into the ZIF-8 solution, and then the 2-methylimidazole solution was poured in. Stirring at room temperature for 24h gave a purple precipitate. And centrifuging to collect precipitates, washing and centrifuging for 3 times by using methanol, and then carrying out vacuum drying for 12h at 60 ℃ to obtain a metal organic framework compound ZIF-8@ ZIF-67 with a core-shell structure, wherein an SEM picture of the compound is shown in a figure 1(b), and the core and the shell of the ZIF-8@ ZIF-67 are both clear dodecahedron structures and smooth in surface, and the particle size of the ZIF-8@ ZIF-67 is 0.5-5 mu m.
Carbonization of ZIF-8@ ZIF-67: and (3) putting the ZIF-8@ ZIF-67 into a tube furnace, heating to 920 ℃ at the heating rate of 2 ℃/min in the argon atmosphere, and keeping for 3h to obtain black powder. And washing the black powder in 1mol/L sulfuric acid for 12h, performing suction filtration until the pH value is 7, and performing vacuum drying for 12h to obtain the multi-stage carbon-coated metal cobalt, which is recorded as Co @ HCP.
CoSe2Synthesis of @ HCP: ball-milling and mixing Co @ HCP and selenium powder according to the mass ratio of 1:1 for 2h, heating to 650 ℃ at the heating rate of 1 ℃/min under the argon environment, and calcining for 3h to obtain multi-stage carbon-coated cobalt selenide, which is marked as CoSe2And @ HCP, wherein SEM and TEM pictures of the HCP are shown in figure 1(c-i), and ZIF-8@ ZIF-67 can be seen to obtain the hollow polyhedral carbon coated by the nano tube (the surface of the hollow polyhedral carbon is fully distributed with the carbon nano tube) after high-temperature treatment in inert atmosphere, so that the multilevel carbon structure is obtained. CoSe from FIG. 1(j)2The EDS-mapping picture of the @ HCP material (and of each element) shows that the resulting CoSe can be seen2@ HCP CoSe in the Material2The nano particles are embedded in a multilevel carbon structure, and the multilevel carbon is doped with nitrogen (wherein the nitrogen source mainly comes from 2-methylimidazole). The doping of nitrogen elements in the multilevel carbon can improve the conductivity of the material, and part of N elements can also provide coordination sites to increase the capacity of the potassium ion battery.
Co @ HCP and CoSe2The XRD pattern of @ HCP is shown in FIG. 2, with 34.2 °, 46.4 °, 51.7 ° and 63.4 ° assigned to cubic phase CoSe, respectively2The peaks at 25.8 ° are assigned to the (002) plane of the graphite carbon.
Example 2: CoSe2@ HCP as negative electrode material of potassium ion button cell for electrochemical performance test
(1) Preparing an electrode: the active material (CoSe obtained in example 1)2@ HCP), Ketjen black and polyvinylidene fluoride (PVDF) in mass ratio7: 2: 1, adding moderate N-methyl pyrrolidone (NMP) solution to prepare uniform pasty slurry, and then uniformly coating the slurry on a copper foil by using a smearing machine. And then the coated electrode plate is placed in a vacuum drying oven to be kept for 12 hours at the temperature of 60 +/-20 ℃, so that the adhesion degree between the electrode material and the copper foil is improved. And finally, cutting the dried pole piece into a circular pole piece with the diameter of 8mm by using a cutting machine for later use.
(2) Assembling the battery: and assembling the button cell by adopting a CR2032 type die in the experiment. The potassium battery takes the round pole piece obtained in the step (1) as a battery cathode, potassium metal as a battery anode, electrolyte is 3mol/L potassium bis (fluorosulfonyl) imide solution (KFSI is dissolved in a mixed solution of ethylene carbonate and dimethyl carbonate according to the volume ratio of 1: 1), and a diaphragm is a polypropylene film. The battery assembly is carried out in a glove box filled with argon, and the oxygen content and the water content in the glove box are both below 0.1ppm in the assembly process.
(3) And (3) testing the battery performance: the new power battery test system is used for the charge and discharge test of the battery. Impedance testing and cyclic voltammetry testing of the electrode material was performed at an electrochemical workstation (chenhua CHI 720E).
Electrochemical test results: the charge-discharge cycle performance diagram of the potassium battery assembled in the step (2) under the current density of 100mA/g is shown in figure 3, and the charge-discharge capacity of 400mAg/h is not obviously attenuated after 80 circles.
The charge and discharge cycle performance diagram of the potassium battery assembled in the step (2) under the condition of high current of 500mA/g is shown in figure 5, and the charge and discharge capacity does not obviously attenuate after 100 circles.
The rate performance graph of the potassium battery assembled in the step (2) is shown in fig. 4, and the material shows excellent rate performance when charged and discharged under the current densities of 100, 200, 500, 1000, 2000 and 5000 mA/g. The capacity was less attenuated as the current density increased, and when the current density was restored to 100mA/g, the original capacity was restored.
After the potassium battery assembled in the step (2) is charged and discharged for 20 circles, impedance test is carried out, as shown in fig. 6, the impedance diagram shows that selenization coated by the multi-stage carbon is carried outCobalt (CoSe)2@ HCP) radius is small, indicating that the resistance value is small and the conductivity is strong, which is one of the reasons why the battery performance is excellent.
The discharge voltage diagram of the potassium battery assembled in the step (2) is shown in fig. 7, and after the potassium battery circulates for 60 circles within the charge-discharge voltage range of 0.01V-3.0V (vs. K +/K), a discharge voltage platform of 1.3-1.7V (vs. K +/K) exists.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims (10)

1. Potassium ion battery negative electrode material CoSe2@ HCP, characterized in that it is prepared by a process comprising the following steps:
(1) heating a metal organic framework compound ZIF-8@ ZIF-67 with a core-shell structure in an inert gas to 650-950 ℃ and calcining for 2-6 h to obtain black powder, performing acid leaching, washing to neutrality, and drying to obtain Co @ HCP;
(2) mixing the Co @ HCP obtained in the step (1) with selenium powder, heating to 650-800 ℃ in a non-oxidizing atmosphere, and calcining for 2-6 h to obtain the multi-stage carbon-coated cobalt selenide, which is marked as CoSe2@HCP；
The obtained CoSe2The multi-stage carbon structure in the @ HCP is a hollow polyhedral carbon structure coated by the carbon nano tube.
2. The negative electrode material CoSe of potassium ion battery as claimed in claim 12@ HCP, characterized in that the obtained CoSe2The multi-stage carbon structure in the @ HCP is a hollow polyhedral carbon structure coated by a nitrogen-doped carbon nanotube.
3. The negative electrode material CoSe of potassium ion battery as claimed in claim 12@ HCP, wherein said step (1): ZIF-8@ ZIF-67The core and the shell of the particle have dodecahedral structures, and the particle size range of ZIF-8@ ZIF-67 is 0.5-5 mu m.
4. The negative electrode material CoSe of potassium ion battery as claimed in claim 12@ HCP, wherein said step (2): the mass ratio of Co @ HCP to selenium powder (1-3): 1 and mixing.
5. The negative electrode material CoSe of potassium ion battery as claimed in claim 12The @ HCP is characterized in that the Co @ HCP and the selenium powder are mixed for 0.5-20 hours in a mixing mode of manual grinding and/or dry ball milling.
6. The negative electrode material CoSe of potassium ion battery as claimed in claim 12@ HCP, wherein the step (1) calcination process is: heating to 800-950 ℃ at a heating rate of 1-20 ℃/min and calcining for 3-4 h; the calcining process in the step (2) is as follows: heating to 650-700 ℃ at a heating rate of 1-20 ℃/min, and calcining for 3-4 h.
7. The negative electrode material CoSe of potassium ion battery as claimed in claim 12@ HCP, wherein said step (1): the inert gas is nitrogen or argon; the step (2): the gas in the non-oxidizing atmosphere is one or more selected from nitrogen, argon, hydrogen and ammonia.
8. With CoSe2@ HCP as negative electrode material, characterized in that the negative electrode material of the potassium ion battery comprises the negative electrode material CoSe2@ HCP, conductive agent and adhesive agent, the mass ratio of which is 50-80:10-25: 5-15.
9. The potassium ion battery of claim 8, wherein the potassium ion battery is prepared by:
(1) the preparation method of the anode material comprises the following steps: mixing CoSe2@ HCP Material, conductive agent and Binder dispersed in N-methylpyrrolidone solvent, thoroughly mixedAnd (3) forming a bright and uniform paste, uniformly coating the paste on a copper foil on a coating machine, and finally drying the electrode plate to obtain the potassium ion battery negative electrode wafer.
10. The potassium ion battery of claim 9, wherein the preparation of the potassium ion battery further comprises:
(2) the method comprises the following steps of assembling the potassium ion button cell: and (2) taking the negative electrode wafer prepared in the step (1) as a battery negative electrode, taking potassium metal as a battery positive electrode, taking KFSI-EC/DMC as electrolyte, and taking a diaphragm as a polypropylene film.
CN202010936185.2A 2020-09-08 2020-09-08 Potassium ion battery negative electrode material and preparation method and application thereof Pending CN112054174A (en)

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