CN109817958B - Potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt, and preparation method and application thereof - Google Patents
Potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt, and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt, a preparation method and application thereof, wherein the preparation method comprises the following steps: s1, dissolving precursor carbon-coated Co into ethanol and carrying out ultrasonic treatment to obtain a solution E, wherein the mass ratio of the precursor carbon-coated Co to the ethanol is (125-1250): 1; s2, fully dissolving PVP into DMF to obtain a solution F, wherein the mass ratio of the PVP to the DMF is (500-1000): 1; s3, adding the solution E into the solution F, and stirring uniformly at room temperature to obtain a mixed solution G, wherein the volume ratio of the solution E to the solution F is 1: (0.5 to 1.5); s4, spinning the mixed solution G, and collecting a substance H; s5, carbonizing the product H in an argon atmosphere to obtain a carbon-coated Co-MOF hollow nanobelt; the hollow nanobelt structure of the carbon-coated Co-MoF adopted by the invention can be used as a negative material of the potassium ion battery, so that the conductivity, the cycle performance and the specific capacity of the battery can be improved.
Description
Technical Field
The invention belongs to the technical field of secondary power battery materials, and particularly relates to a preparation method and application of a potassium ion battery cathode material C-coated Co-MOF hollow nanobelt.
Background
Green and rechargeable secondary batteries, particularly Lithium Ion Batteries (LIBs), have now been widely used in portable electronic and electric vehicles because of their high energy and power densities. However, the scarcity and high cost of lithium severely hamper the further development of future LIBs. In recent years, potassium ion batteries (KIBs) are gaining more attention again because of the abundant potassium resources on earth. K+The redox potential of/K (-2.93V vs. NHE) is close to that of redox Li+Li (-3.04V and NHE), lower than Na+Na (-2.71V and NHE) makes KIBs have higher potential and safer voltage for use.
Carbon materials have long been used in many chemical and other fields, including adsorption, catalysis, energy storage, and electronic applications. Due to the importance of carbonaceous materials, new innovative technologies are constantly being developed worldwide. Thus, in recent years, many porous carbonaceous materials, either microporous or mesoporous, or having a hierarchical structure, have become useful for many applications. Several techniques have been applied to the preparation of potassium ion battery negative electrode materials, including pyrolysis, chemical vapor deposition, arc discharge, hydrothermal carbonization, and post-synthesis MOFs structures. Pyrolysis is a technique for preparing nanoporous carbons in recent years because of their high thermal and chemical stability. To improve the properties of these carbonaceous materials, it is important to achieve uniform pore sizes, and therefore, the materials used in the pyrolysis process should be carefully selected. Metal Organic Frameworks (MOFs) are therefore considered as a promising high temperature material.
Disclosure of Invention
The invention aims to provide a potassium ion battery cathode material C-coated Co-MOF hollow nanobelt, a preparation method and application; the hollow nano-band structure of the carbon-coated Co-MoF prepared by the invention can be used as a negative material of a potassium ion battery to improve the conductivity, the cycle performance and the specific capacity of the battery. The metal organic framework can be reducedK+Resistance in the embedding and stripping processes is achieved, meanwhile, the conductivity of the battery can be increased by the metal Co, and the volume expansion caused in the potassium ion embedding and stripping processes is relieved by the structure of the hollow nanobelt, so that the specific capacity of the battery is increased; the invention combines the structural characteristics of Co-MOF and carbon nanobelts to prepare the hollow nanobelt of the Co-MoF coated with carbon, which improves the specific capacity and the conductivity of the potassium ion battery.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a preparation method of a potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt, which comprises the following steps:
s1, dissolving precursor carbon-coated Co into ethanol and carrying out ultrasonic treatment to obtain a solution E, wherein the mass ratio of the precursor carbon-coated Co to the ethanol is (125-1250): 1;
s2, fully dissolving PVP into DMF to obtain a solution F, wherein the mass ratio of the PVP to the DMF is (500-1000): 1;
s3, adding the solution E into the solution F, and stirring uniformly at room temperature to obtain a mixed solution G, wherein the volume ratio of the solution E to the solution F is 1: (0.5 to 1.5);
s4, spinning the mixed solution G, and collecting a substance H;
s5, taking the product H, and carrying out carbonization treatment in an argon atmosphere to obtain the carbon-coated Co-MOF hollow nanobelt.
Preferably, in S1, the precursor carbon-coated Co is prepared as follows:
step 2, dissolving methylimidazole in the solution A to obtain a solution B, wherein the mass ratio of methylimidazole to cobalt nitrate is 1 (0.88-2);
step 3, uniformly stirring the solution B at room temperature to obtain a product C;
step 4, sequentially carrying out centrifugal separation, clarification and drying on the product C to obtain a precursor D;
and 5, annealing the precursor D in an argon atmosphere to obtain precursor carbon-coated Co.
Preferably, in S4, the centrifugal separation process parameter is (10000-15000) rpm; and during cleaning, deionized water and ethanol are selected for repeated cleaning.
Preferably, in S5, the process conditions: annealing is carried out for 1-6 h at the temperature of 400-600 ℃ in the argon atmosphere.
Preferably, in S9, the spinning process conditions are: the voltage was 20KV and the flow rate was 45. mu.L/min.
Preferably, in S10, the process conditions of the carbonization treatment are: carbonizing at 400-600 ℃ for 1-6 h.
A potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt is prepared based on a preparation method.
An application of a potassium ion battery cathode material C-coated Co-MOF hollow nanobelt is to assemble a button battery by taking the C-coated Co-MOF hollow nanobelt as a cathode material of the potassium ion battery.
Preferably, the specific method of assembling the button cell is: the negative electrode adopts DMF as a solvent, and the formula of the pole piece is as follows: PVDF: acetylene black ═ 9-x: 1: x is prepared into slurry according to the mass ratio of x, then the slurry is uniformly coated on copper foil, the copper foil is placed into a vacuum drying box for drying, and then the negative plate for the experimental battery is obtained through punching, wherein x is more than or equal to 1 and less than or equal to 2;
taking metal potassium as a counter electrode; mixing ethyl carbonate and dimethyl carbonate solution with electrolyte of KPF6 according to a volume ratio of 1: 1; the diaphragm is a celgard2400 film; the order of assembling the battery is that a negative electrode shell, a potassium plate, a diaphragm, a negative electrode plate, a gasket, a spring piece and a positive electrode shell are sequentially arranged in a glove box filled with inert atmosphere to assemble the button battery.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the preparation method of the C-coated Co-MOF hollow nanobelt of the potassium ion battery negative electrode material, the C-coated Co-MOF hollow nanobelt is prepared by adopting an electrostatic spinning method, and the synthesis process is simple, easy to operate and non-toxic. Synthetic Co-MOF nanoparticlesThe particles are completely coated by the carbon nanobelts and are uniform, the diameters of the nanobelts are uniform, the specific surface area of the nanobelts is large, the nanobelts can be fully contacted with electrolyte, and K is increased+The transmission path of (2) improves the performance of the battery. The hollow structure can relieve the volume expansion of the electrode material in the charging and discharging process, and the conductivity of the electrode can be improved after the material is carbonized. The hollow nano-band structure of the carbon-coated Co-MoF can be used as a negative material of the potassium ion battery to improve the conductivity, the cycle performance and the specific capacity of the battery. The metal organic framework can reduce K+The resistance in the embedding and separating process is realized, meanwhile, the conductivity of the battery can be increased by the metal Co, and the volume expansion caused in the potassium ion embedding and separating process is relieved by the structure of the hollow nanobelt, so that the specific capacity of the battery is increased.
Furthermore, a sample is centrifuged at a high centrifugation speed, and deionized water and ethanol are repeatedly used for washing to remove redundant inorganic salts and organic matters, so that the purity of the product is improved.
Further, the product is completely carbonized, the shape of the Co-MOF is kept, and the hollow shape is formed.
Further, the synergistic effect between the voltage and the speed of spinning can spin the nanobelts with uniform thickness.
Drawings
FIG. 1 is an SEM image of carbonized Co-MOF;
FIG. 2 is an SEM image of a C-coated Co-MOF;
FIG. 3 is a charge and discharge curve of carbonized C-coated Co-MOF as a negative electrode material for a potassium ion battery;
Detailed Description
The invention provides a preparation method and application of a potassium ion battery negative electrode material C-coated Co-MOF. The carbon hollow nano-belt is used for uniformly providing larger specific surface area and better conductivity, and is suitable for K+The conductivity, the cycle performance and the rate performance of the obtained active material are better.
Referring to the drawings, the preparation method of the potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt comprises the following steps:
s1, dissolving cobalt nitrate in methanol under magnetic stirring to obtain a solution A, wherein the mass ratio of the cobalt nitrate to the methanol is (12.5-15): 1;
s2, dissolving methylimidazole in the solution A under magnetic stirring to obtain a solution B, wherein the mass ratio of the methylimidazole to the cobalt nitrate is 1 (0.88-2);
s3, stirring the solution B at room temperature for 24 hours to obtain a product C;
s4, centrifugally separating the product C at 10000-15000 rpm, repeatedly cleaning the product C for 3 times by using deionized water and ethanol, and drying the product C at the temperature of 60-80 ℃ for 12-24h to obtain a precursor D;
s5, annealing the precursor D in an argon atmosphere at the temperature of 400-600 ℃ for 1-6 h to obtain precursor carbon-coated Co;
s6, dissolving precursor carbon-coated Co into ethanol, and performing ultrasonic treatment for 30-60 min to obtain a solution E, wherein the mass ratio of the precursor carbon-coated Co to the ethanol is (125-1250): 1;
s7, weighing PVP, and fully dissolving the PVP into DMF to obtain a solution F, wherein the mass ratio of the PVP to the DMF is (500-1000): 1;
s8, adding the solution E into the solution F under magnetic stirring, and stirring for 24 hours at room temperature; obtaining a mixed solution G, wherein the volume ratio of the solution E to the solution F is 1: (0.5 to 1.5);
s9, taking 5mL of mixed solution G by using a 5mL needle cylinder, spinning at the voltage of 20KV and the flow rate of 45 mu L/min, and collecting a substance H;
s10, carbonizing the product H at 400-600 ℃ for 1-6H in an argon atmosphere to obtain the carbon-coated Co-MOF hollow nanobelt.
Preferably, the preferable carbonization temperature of the precursor is 600 ℃, and the annealing time is 3 h; the annealing temperature of the Co-MOF hollow nanobelt is 500 ℃, and the annealing time is 3h.
The carbon-coated Co-MOF hollow nanobelt for the potassium ion battery is applied to a button battery as a negative electrode material, DMF is used as a solvent for dissolving PVDF as a negative electrode, and the formula of a pole piece is as follows: PVDF: acetylene black ═ 9-x: 1: x (x is more than or equal to 1 and less than or equal to 2) is prepared into slurry, then the slurry is uniformly coated on copper foil, and the copper foil is placed into a vacuum drying oven to be dried for 12 hours at the temperature of 80 ℃ and then is punched into a wafer with the diameter of 12mm to obtain a pole piece for the experimental battery; the solution obtained by mixing ethyl carbonate and dimethyl carbonate with electrolyte of 1.0M KPF6 according to the volume ratio of 1:1 and diaphragm of celgard2400 membrane is used as a counter electrode, and the solution is filled in a glove box filled with argon atmosphere to form a button cell.
The order of assembling the battery is that a negative electrode shell, a potassium plate, a diaphragm, a negative electrode plate, a gasket, a spring piece and a positive electrode shell are sequentially arranged in a glove box filled with inert atmosphere to assemble the button battery.
The charge-discharge cut-off voltage of the button cell is 0.01-2.6V, and the charge-discharge current density is 50 mA/g.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments 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
(1) Under magnetic stirring, 291mg of cobalt nitrate was dissolved in 20mL of methanol to obtain a solution A;
(2) dissolving 582mg of methylimidazole in the solution A under magnetic stirring to obtain a solution B;
(3) stirring the solution B at room temperature for 24 hours to obtain a product C;
(4) centrifuging the solution C at 10000rpm, repeatedly cleaning the solution C for 3 times by using deionized water and ethanol, and drying the solution C at the temperature of 60 ℃ for 12 ℃ to obtain a precursor D;
(5) annealing the synthesized product D for 1h at the temperature of 400 ℃ in an argon atmosphere to obtain carbon-coated Co;
(6) dissolving carbon-coated Co into 15mL of ethanol and performing ultrasonic treatment for 30min to obtain a solution E;
(7) weighing 0.8g of PVP, and fully dissolving the PVP into 5mL of DMF to obtain a solution F;
(8) adding the solution E into the solution F under magnetic stirring, and stirring for 24 hours at room temperature;
(9) taking 3mL of mixed solution G by using a needle cylinder, spinning under certain voltage and flow rate, and collecting a substance H;
(10) and taking the product H to perform annealing treatment at 550 ℃ for 3H in an argon atmosphere to obtain the carbon-coated Co-MOF hollow nanobelt.
Example 2
(1) dissolving 291mg of cobalt nitrate in 20mL of methanol under magnetic stirring to obtain a solution A;
(2) under magnetic stirring, dissolving 400mg of methylimidazole in the solution A to obtain a solution B;
(3) stirring the solution B at room temperature for 24 hours to obtain a product C;
(4) centrifuging the solution C at 10000rpm, repeatedly cleaning the solution C for 3 times by using deionized water and ethanol, and drying the solution C at 60 ℃ for 12-24h to obtain a precursor D;
(5) annealing the synthesized product D in an argon atmosphere at the temperature of 300 ℃ for 3h to obtain carbon-coated Co;
(6) dissolving carbon-coated Co into 15mL of ethanol and performing ultrasonic treatment for 45min to obtain a solution E;
(7) weighing 0.8g of PVP, and fully dissolving the PVP into 5mL of DMF to obtain a solution F;
(8) adding the solution E into the solution F under magnetic stirring, and stirring for 24 hours at room temperature;
(9) taking 3mL of mixed solution G by using a needle cylinder, spinning under certain voltage and flow rate, and collecting a substance H;
(10) and taking the product H to perform annealing treatment at 500 ℃ for 3H in an argon atmosphere to obtain the carbon-coated Co-MOF hollow nanobelt.
Example 3
(1) Under magnetic stirring, 291mg of cobalt nitrate was dissolved in 25mL of methanol to obtain a solution A;
(2) dissolving 256mg of methylimidazole in the solution A under magnetic stirring to obtain a solution B;
(3) stirring the solution B at room temperature for 24 hours to obtain a product C;
(4) centrifuging the solution C at 10000rpm, repeatedly cleaning the solution C for 3 times by using deionized water and ethanol, and drying the solution C at 60 ℃ for 12-24h to obtain a precursor D;
(5) annealing the synthesized product D for 6 hours at the temperature of 300 ℃ in an argon atmosphere to obtain carbon-coated Co;
(6) dissolving carbon-coated Co into 5mL of ethanol and performing ultrasonic treatment for 60min to obtain a solution E;
(7) weighing 0.8g of PVP, and fully dissolving into 10mL of DMF to obtain a solution F;
(8) adding the solution E into the solution F under magnetic stirring, and stirring for 24 hours at room temperature;
(9) taking 3mL of mixed solution G by using a needle cylinder, spinning under certain voltage and flow rate, and collecting a substance H;
(10) and taking the product H to perform annealing treatment at 550 ℃ for 3H in an argon atmosphere to obtain the carbon-coated Co-MOF hollow nanobelt.
Example 4
(1) Under magnetic stirring, 291mg of cobalt nitrate was dissolved in 25mL of methanol to obtain a solution A;
(2) under magnetic stirring, 328mg of methylimidazole is dissolved in the solution A to obtain a solution B;
(3) stirring the solution B at room temperature for 24 hours to obtain a product C;
(4) centrifuging the solution C at 15000rpm, repeatedly cleaning with deionized water and ethanol for 3 times, and drying at 60 ℃ for 24h to obtain a precursor D;
(5) annealing the synthesized product D for 1h at the temperature of 600 ℃ in an argon atmosphere to obtain carbon-coated Co;
(6) dissolving carbon-coated Co into 5mL of ethanol and performing ultrasonic treatment for 60min to obtain a solution E;
(7) weighing 0.8g of PVP, and fully dissolving the PVP into 8mL of DMF to obtain a solution F;
(8) adding the solution E into the solution F under magnetic stirring, and stirring for 24 hours at room temperature;
(9) taking 4mL of mixed solution G by using a needle cylinder, spinning under certain voltage and flow rate, and collecting a substance H;
(10) and taking the product H to perform annealing treatment at 550 ℃ for 3H in an argon atmosphere to obtain the carbon-coated Co-MOF hollow nanobelt.
Example 5
(1) dissolving 291mg of cobalt nitrate in 25mL of methanol under magnetic stirring to obtain a solution A;
(2) under magnetic stirring, 328mg of methylimidazole is dissolved in the solution A to obtain a solution B;
(3) stirring the solution B at room temperature for 24 hours to obtain a product C;
(4) centrifuging the solution C at 10000rpm, repeatedly cleaning the solution C for 3 times by using deionized water and ethanol, and drying the solution C at 60 ℃ for 24 hours to obtain a precursor D;
(5) annealing the synthesized product D in an argon atmosphere at the temperature of 600 ℃ for 3h to obtain carbon-coated Co;
(6) dissolving carbon-coated Co into 5mL of ethanol and performing ultrasonic treatment for 60min to obtain a solution E;
(7) weighing 0.8g of PVP, and fully dissolving into 15mL of DMF to obtain a solution F;
(8) adding the solution E into the solution F under magnetic stirring, and stirring for 24 hours at room temperature;
(9) taking 3mL of mixed solution G by using a needle cylinder, spinning under certain voltage and flow rate, and collecting a substance H;
(10) and taking the product H to perform annealing treatment at 600 ℃ for 3H in an argon atmosphere to obtain the carbon-coated Co-MOF hollow nanobelt.
Example 6
(1) dissolving 291mg of cobalt nitrate in 25mL of methanol under magnetic stirring to obtain a solution A;
(2) under magnetic stirring, 328mg of methylimidazole is dissolved in the solution A to obtain a solution B;
(3) stirring the solution B at room temperature for 24 hours to obtain a product C;
(4) centrifuging the solution C at 15000rpm, repeatedly cleaning with deionized water and ethanol for 3 times, and drying at 60 ℃ for 24h to obtain a precursor D;
(5) annealing the synthesized product D in an argon atmosphere at the temperature of 600 ℃ for 6h to obtain carbon-coated Co;
(6) dissolving carbon-coated Co into 5mL of ethanol and performing ultrasonic treatment for 60min to obtain a solution E;
(7) weighing 0.8g of PVP, and fully dissolving into 10mL of DMF to obtain a solution F;
(8) adding the solution E into the solution F under magnetic stirring, and stirring for 24 hours at room temperature;
(9) taking 3mL of mixed solution G by using a needle cylinder, spinning under certain voltage and flow rate, and collecting a substance H;
(10) and taking the product H to perform annealing treatment at 550 ℃ for 3H in an argon atmosphere to obtain the carbon-coated Co-MOF hollow nanobelt.
Through the implementation of the experiment, the carbon-coated Co-MOF hollow nanobelt obtained in the example 6 is found to have more uniform appearance, and is beneficial to the embedding and the releasing of K +. As shown in FIG. 1, it is an SEM image of carbonized Co-MOF, which is an octahedral structure of ZiF-8, and it can be seen from the SEM image that the size of the carbonized Co-MOF is uniform about 200-400nm, and the interior of the carbonized Co-MOF is a hollow structure.
FIG. 2 is an SEM image of carbonized C @ Co-MOF, in which the hollow nano-belts have uniform thickness and diameter between 200 and 300nm, have larger specific surface area and larger conductivity when used as a negative electrode material of a potassium ion battery, and the hollow structure reduces the resistance of potassium ions during intercalation and deintercalation.
In FIG. 3, the charge and discharge test is carried out on the potassium ion battery assembled by the composite material of C @ Co-MOF under the conditions that the voltage is 0.01V-2.6V and the current density is 50mA/g, and the charge and discharge graphs are shown in the numbers of 1, 2, 5,10,20 and 50. The first charging and discharging efficiency is up to 83.7% with the specific capacity of 648mAh/g and 774mAh/g, and the first charging and discharging efficiency is not high probably because a part of electrolyte is used for forming SEI film. The 293mAh/g specific capacity is still maintained after 50 times of charge and discharge.
Claims (8)
1. A preparation method of a potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt is characterized by comprising the following steps:
s1, dissolving the precursor carbon-coated Co into ethanol and carrying out ultrasonic treatment to obtain a solution E;
s2, fully dissolving PVP into DMF to obtain a solution F;
s3, adding the solution E into the solution F, and stirring uniformly at room temperature to obtain a mixed solution G, wherein the volume ratio of the solution E to the solution F is 1: (0.5 to 1.5);
s4, spinning the mixed solution G, and collecting a substance H;
s5, carbonizing the product H in an argon atmosphere to obtain a carbon-coated Co-MOF hollow nanobelt;
in S1, the preparation method of the precursor carbon-coated Co is as follows:
step 1, dissolving cobalt nitrate in methanol to obtain a solution A, wherein the mass ratio of the cobalt nitrate to the methanol is (12.5-15): 1;
step 2, dissolving methylimidazole in the solution A to obtain a solution B, wherein the mass ratio of methylimidazole to cobalt nitrate is 1 (0.88-2);
step 3, uniformly stirring the solution B at room temperature to obtain a product C;
step 4, sequentially carrying out centrifugal separation, cleaning and drying on the product C to obtain a precursor D;
and 5, annealing the precursor D in an inert atmosphere to obtain precursor carbon-coated Co.
2. The preparation method of the potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt according to claim 1, characterized in that in the step 4, the centrifugal separation process parameter is (10000-15000) rpm; and during cleaning, deionized water and ethanol are selected for repeated cleaning.
3. The preparation method of the potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt according to claim 1, characterized in that in the step 5, the process conditions are as follows: annealing is carried out for 1-6 h at the temperature of 400-600 ℃ in the argon atmosphere.
4. The preparation method of the potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt of claim 1, wherein in S4, the spinning process conditions are as follows: the voltage was 20KV and the flow rate was 45. mu.L/min.
5. The preparation method of the potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt according to claim 1, wherein in S5, the carbonization process conditions are as follows: carbonizing at 400-600 ℃ for 1-6 h.
6. A potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt is characterized by being prepared based on the preparation method of any one of claims 1 to 5.
7. An application of a potassium ion battery negative electrode material C-coated Co-MOF hollow nano-belt is characterized in that the C-coated Co-MOF hollow nano-belt of claim 6 is used as a negative electrode material of a potassium ion battery and assembled into a button battery.
8. The application of the potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt as claimed in claim 7, is characterized in that the specific method for assembling the button battery is as follows: the negative electrode adopts DMF as a solvent, and the formula of the pole piece is as follows: PVDF: acetylene black ═ 9-x: 1: x is prepared into slurry according to the mass ratio of x, then the slurry is uniformly coated on copper foil, the copper foil is placed into a vacuum drying box for drying, and then the negative plate for the experimental battery is obtained through punching, wherein x is more than or equal to 1 and less than or equal to 2;
taking metal potassium as a counter electrode; the electrolyte is KPF6Ethyl carbon of (2)Mixing the acid ester and the dimethyl carbonate solution according to the volume ratio of 1: 1; the diaphragm is a celgard2400 film; the order of assembling the battery is that a negative electrode shell, a potassium plate, a diaphragm, a negative electrode plate, a gasket, a spring piece and a positive electrode shell are sequentially arranged in a glove box filled with inert atmosphere to assemble the button battery.
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