CN113044840A - Activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material and preparation method and application thereof - Google Patents

Activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material and preparation method and application thereof Download PDF

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CN113044840A
CN113044840A CN202110255160.0A CN202110255160A CN113044840A CN 113044840 A CN113044840 A CN 113044840A CN 202110255160 A CN202110255160 A CN 202110255160A CN 113044840 A CN113044840 A CN 113044840A
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activated carbon
composite material
nitrogen double
array composite
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CN113044840B (en
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许占位
李康
朱建锋
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Shaanxi University of Science and Technology
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Abstract

The invention discloses an activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material as well as a preparation method and application thereof, and belongs to the technical field of preparation of potassium ion battery cathode materials. The method comprises the steps of firstly, preparing functionalized active carbon, 2, 3-pyridinedicarboxylic acid and CoCl2·6H2Mixing O, urea and ammonium molybdateThe method is environment-friendly, short in production period, low in energy consumption, easy in obtaining of raw materials and beneficial to large-scale production. The activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material prepared by the method has high purity, can be used as a potassium ion battery cathode material, has good represented cycling stability and high discharge specific capacity, and can be widely used as the potassium ion battery cathode material.

Description

Activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material and preparation method and application thereof
Technical Field
The invention belongs to the technical field of preparation of potassium ion battery cathode materials, and relates to an activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material, a preparation method thereof, and a potassium ion battery cathode method and application thereof, in particular to an activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material, a preparation method thereof, and application thereof as a potassium ion battery cathode.
Background
Potassium ion batteries are considered to be the most promising alternative to lithium ion batteries as a sustainable energy storage device due to their potassium-rich and low cost. [ Wu, X.; chen, y.; xing, z.; lam, C.W.K.; pang, S. -S.; zhang, w.; ju, z.adv.energy mater.2019,9,1900343.]The crust deposition amount of potassium (1.5 wt%) was 882.4 times that of lithium (0.0017 wt%). [ Zheng, j.; yang, y.; fan, x.; ji, g.; ji, x.; wang, h.; hou, s.; zachariah, m.r.; wang, c.energ.environ.sci.2019,12,615.]At the same time, K+The redox potential of the/K is closer to Li+The redox potential (-2.93V vs E vs. -3.04V vs E, standard hydrogen electrode (E, SHE)) for Li indicates that the potassium ion battery has a wider voltage range and higher energy density. [ Kubota, K.; dahbi, M.; hosaka, t.; kumakura, s.; komaba, s.chem.rec.2018,18,459.]The potassium ion battery also has K+vs Li+The advantage of weaker Lewis acidity, which results in smaller stokes radius of solvated ions, has higher transport number and mobility in the electrolyte, which provides an opportunity to design high current cells. [ Kubota, K.; dahbi, M.; hosaka, t.; kumakura, s.; komaba, s.chem.rec.2018,18,459.]However, a major challenge for potassium ion batteries is K+
Figure BDA0002967925360000011
Is greater than Li+
Figure BDA0002967925360000012
Thus, K+The insertion/de-insertion of (A) will result in electricityThe electrode material expands in volume, resulting in low capacity, poor cycling stability, and poor rate performance.
To overcome the barriers to potassium depletion and potassium depletion, a good alternative is to control the expansion of the carbon lattice spacing by doping with N, S, O and P, and generally exhibits higher cyclic reversibility than undoped carbon. Three-dimensional S and N co-doped carbon nanofiber aerogel electrode at 2A g-1Low reversible capacity of 168mA h g-1。[Lv,C.；Xu,W.；Liu,H.；Zhang,L.；Chen,S.；Yang,X.；Xu,X.；Yang,D.Small 2019,15,1900816.]The cathode material of potassium ion battery uses composite carbon rich in S (12.9 at%) and N (9.9 at%), and is 1A g-1Then reaches 234mA h g-1The capacity of (c). [ Tao, l.; yang, y.; wang, h.; zheng, y.; hao, h.; song, w.; shi, j.; huang, m.; mitlin, d.energy Storage mater.2020,27,212.]The double-doped carbon with synergistic effect has stronger reversibility.
In recent years, double-doped carbon has good electrochemical properties, including N, O-doped hard carbon, P, N-doped carbon, and S, O-doped porous hard carbon microspheres. The metal and nonmetal co-doped carbon material can not only increase the lattice spacing, but also has higher capacity than the potassium doped material. Molybdenum-carbon composites have a high theoretical capacity, good electrical conductivity, stable metallic properties and thermal stability, and have been successfully used to enhance Li and Na storage. However, the application of Mo and N co-doped carbon nano composite material synthesized by in-situ carbonization of nitrogen-rich phthalocyanine as the anode of the potassium ion battery is reported.
Disclosure of Invention
The invention aims to provide a preparation method of an activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material with a structure similar to that of a silver lug and application of the composite material as a potassium ion battery cathode material, wherein the preparation method has the characteristics of no pollution, simple process, short time, low energy consumption, good stability, high yield and the like, and can meet the requirement of mass production; the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material prepared by the method has the characteristics of high specific capacity, stable cycle performance and the like in the preparation of a potassium ion battery material.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a preparation method of an activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material, which comprises the following steps:
1) 2, 3-pyridinedicarboxylic acid, CoCl2·6H2Mixing O, urea, molybdic acid and the functionalized activated carbon uniformly to prepare a mixture;
2) heating the mixture from room temperature to 100-200 ℃, carrying out heat preservation treatment for 10-60 min, then heating to 200-300 ℃, carrying out heat preservation treatment for 1-3 h, and cooling to room temperature;
3) heating the product treated in the step 2) from room temperature to 500-700 ℃ under the argon atmosphere, carrying out heat preservation treatment for 10-60 min, then heating to 700-1000 ℃, carrying out heat preservation for 1-4 h, and cooling to room temperature;
4) cleaning and drying the product treated in the step 3) to obtain the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material.
Preferably, in step 1), 2, 3-pyridinedicarboxylic acid, CoCl2·6H2The mass ratio of the O, the urea, the molybdic acid and the activated carbon after the functionalization treatment is (1-2): (0.75-1.5): (1.5-3): (0.1-0.25): (0.5 to 1).
Preferably, the activated carbon after the functionalization treatment is HNO (HNO) with the concentration of 2-8mol/L3Heating the solution in water bath at 40-80 ℃ for 10-40 h to obtain the product.
Preferably, the step 2) is carried out in a muffle furnace, the temperature of the mixture is raised to 100-200 ℃ from room temperature at a temperature rise rate of 5-15 ℃/min, the mixture is subjected to heat preservation treatment for 10-60 min, and then the mixture is heated to 200-300 ℃ at a temperature rise rate of 5-15 ℃/min.
Preferably, the step 3) is carried out in a tube furnace, and the product treated in the step 2) is heated to 500-700 ℃ at a heating rate of 5-15 ℃/min from room temperature and is kept for 10-60 minutes; then heating to 700-1000 ℃ at a heating rate of 5-15 ℃/min.
The invention also discloses the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material prepared by the preparation method.
The invention also discloses application of the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material in preparation of a potassium ion battery cathode material.
The invention also discloses a potassium ion battery cathode material, which is prepared from the activated carbon-loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material, and the cycle performance of the potassium ion battery cathode material under the current density of 50mA/g is as follows: the first circle reaches 457.5mAh/g, and the first circle is circulated for 100 circles and then is stabilized at 383.1 mAh/g; under the condition of a large current density of 5A/g, the high capacity is 144.4mAh/g, and the loss rate of each circulation capacity is 0.49 per thousand.
Compared with the prior art, the invention has the following beneficial effects:
the preparation method of the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material disclosed by the invention is novel in design thought, and firstly, the functionalized activated carbon, 2, 3-pyridinedicarboxylic acid and CoCl2·6H2The method is environment-friendly, short in production period, low in energy consumption, easy in obtaining of raw materials and beneficial to large-scale production.
Furthermore, the activated carbon used in the invention adopts 2-8mol/L HNO3The water bath heating treatment is carried out on the activated carbon to ensure that the activated carbon has carboxyl functional groups on the surface and provides C-O-Co chemical bonds for the subsequent composition with the nitrogen-rich phthalocyanine.
The activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material prepared by the method has high purity, can be used as a potassium ion battery cathode material, has good circulation stability (the circulation performance under the current density of 50mA/g is that the first circle reaches 457.5mAh/g, and the circulation performance after 100 circles is stable at 383.1mAh/g), has high discharge specific capacity (the high capacity is 144.4mAh/g under the high current density of 5A/g), and can be widely used as a potassium ion battery cathode material.
Drawings
FIG. 1 is an XRD (X-ray diffraction) diagram of an activated carbon supported molybdenum and nitrogen double-doped carbon nanosheet array composite material prepared by the method;
FIG. 2 is an electron microscope photograph of the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material prepared in the present invention; wherein a and b are SEM images of the prepared activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material with different magnifications; c. d is TEM images of different magnifications of the prepared activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material;
fig. 3 is a multiplying power performance diagram of the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material prepared by the method disclosed by the invention in potassium ion batteries with different current densities.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
example 1
A preparation method of an activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material comprises the following steps:
1) taking 0.1g of functionalized activated carbon (2mol/L HNO)3In the solution, heated in a water bath at 40 ℃ for 10 hours), 1.2g of 2, 3-pyridinedicarboxylic acid, 0.55g of CoCl2·6H2O, 1.8g of urea and 0.1g of ammonium molybdate are mixed uniformly; (ii) a
2) Placing the mixture in a muffle furnace, raising the temperature of the mixture from room temperature to 100 ℃ at the temperature rise speed of 5 ℃/min, and preserving the temperature for 20 minutes; then heating to 250 ℃ at the heating rate of 5 ℃/min, preserving heat for 2h, and cooling to room temperature;
3) putting the product treated in the step 2) into a tubular furnace, heating to 500 ℃ at a heating rate of 5 ℃/min in an argon environment, and preserving heat for 10 minutes; then heating to 700 ℃ at the heating rate of 5 ℃/min, preserving the heat for 1h, and cooling to room temperature;
4) cleaning and drying the product obtained in the step 3) to synthesize the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material.
Example 2
A preparation method of an activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material comprises the following steps:
1) 0.2g of functionalized activated carbon (4mol/L HNO) is taken3In solution, heated in a water bath at 20 ℃ for 10 hours), 1.4g of 2, 3-pyridinedicarboxylic acid, 0.85g of CoCl2·6H2O, 2.0g of urea and 0.15g of ammonium molybdate are mixed uniformly; (ii) a
2) Placing the mixture in a muffle furnace, raising the temperature of the mixture from room temperature to 140 ℃ at a heating rate of 10 ℃/min, and preserving the temperature for 30 minutes; then heating to 250 ℃ at the heating rate of 10 ℃/min, preserving the heat for 2h, and cooling to room temperature;
3) putting the product treated in the step 2) into a tubular furnace, heating to 600 ℃ at a heating rate of 10 ℃/min in an argon environment, and preserving heat for 10 minutes; then heating to 780 ℃ at the heating rate of 5 ℃/min, preserving heat for 2h, and cooling to room temperature;
4) cleaning and drying the product obtained in the step 3) to synthesize the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material.
Example 3
A preparation method of an activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material comprises the following steps:
1) 0.15g of functionalized activated carbon (6mol/L HNO) is taken3In the solution, heated in a water bath at 60 ℃ for 15 hours), 1.8g of 2, 3-pyridinedicarboxylic acid, 1.5g of CoCl2·6H2O, 2.0g of urea and 0.1g of ammonium molybdate are mixed uniformly; (ii) a
2) Placing the mixture in a muffle furnace, raising the temperature of the mixture from room temperature to 180 ℃ at the temperature rise speed of 5 ℃/min, and preserving the temperature for 20 minutes; then heating to 350 ℃ at the heating rate of 5 ℃/min, preserving heat for 3h, and cooling to room temperature;
3) putting the product treated in the step 2) into a tubular furnace, heating to 650 ℃ at a heating rate of 5 ℃/min in an argon environment, and preserving heat for 30 minutes; then heating to 800 ℃ at the heating rate of 5 ℃/min, preserving heat for 3h, and cooling to room temperature;
4) cleaning and drying the product obtained in the step 3) to synthesize the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material.
Example 4
A preparation method of an activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material comprises the following steps:
1) 0.5g of functionalized activated carbon (3mol/L HNO) is taken3In the solution, heated in a water bath at 80 ℃ for 10 hours), 1.5g of 2, 3-pyridinedicarboxylic acid, 0.75g of CoCl2·6H2O, 3g of urea and 0.25g of ammonium molybdate are mixed uniformly; (ii) a
2) Placing the mixture in a muffle furnace, raising the temperature of the mixture from room temperature to 180 ℃ at a temperature rise speed of 15 ℃/min, and preserving the temperature for 60 minutes; then heating to 270 ℃ at the heating rate of 15 ℃/min, preserving heat for 1.5h, and cooling to room temperature;
3) putting the product treated in the step 2) into a tubular furnace, heating to 700 ℃ at a heating rate of 15 ℃/min in an argon environment, and keeping the temperature for 60 minutes; then heating to 900 ℃ at the heating rate of 15 ℃/min, preserving the heat for 4h, and cooling to room temperature;
4) cleaning and drying the product obtained in the step 3) to synthesize the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material.
Example 5
A preparation method of an activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material comprises the following steps:
1) taking 1g of functionalized activated carbon (8mol/L HNO)3In the solution, heated in a water bath at 80 ℃ for 40 hours), 2g of 2, 3-pyridinedicarboxylic acid, 1.5g of CoCl2·6H2O, 2.5g of urea and 0.2g of ammonium molybdate are mixed uniformly; (ii) a
2) Placing the mixture in a muffle furnace, raising the temperature of the mixture from room temperature to 160 ℃ at the temperature rise speed of 5 ℃/min, and preserving the temperature for 40 minutes; then heating to 300 ℃ at the heating rate of 5 ℃/min, preserving the heat for 2h, and cooling to room temperature;
3) putting the product treated in the step 2) into a tubular furnace, heating to 650 ℃ at a heating rate of 5 ℃/min in an argon environment, and preserving heat for 30 minutes; then heating to 875 ℃ at the heating rate of 10 ℃/min, preserving the heat for 2h, and cooling to room temperature;
4) cleaning and drying the product obtained in the step 3) to synthesize the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material.
Referring to fig. 1, the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material Mo prepared by the invention2The X-ray diffraction (XRD) pattern of C-MoC/AC-N showed a sharp peak at 25.2 deg. corresponding to the (002) plane of carbon, indicating that its carbon material has high crystallinity. From the calculation of 2dsin θ ═ N λ, the (002) peak was shifted 0.7 ° to the left compared to AC-F at 25.9 °, and the interlayer spacing increase due to N doping was increased
Figure BDA0002967925360000081
It favors the insertion and intercalation of K ions, which corresponds to TEM images. Mo2The C-MoC/AC-N composite material shows obvious diffraction, which respectively corresponds to Mo2C (PDF #35-0787) and MoC (PDF # 89-4305). The two peaks at 37.9 ° and 39.4 ° correspond to (002) and Mo2The (101) plane of C, and the two peaks at 39.2 ° and 42.6 °, correspond to the (103) and (104) planes of MoC, respectively. The precursor CoTAP/AC-F is formed by the overlap of diffraction peaks of AC-F and CoTAP in the (002) plane at (26.2 °), and moves 0.3 ° to the right, indicating that the interlayer spacing of the carbon material is reduced. These four typical diffraction peaks at 13.35 °, 16.48 °, 26.07 ° and 43.04 ° are characteristic peaks of CoTAP.
Referring to FIG. 2, a in FIG. 2 shows Mo2Low magnification SEM micrograph of C-MoC/AC-N composite showing homogeneous Mo immobilized on AC-F2C-MoC/G-N nanosheets. In FIG. 2, panel b is the nanoplatelets interleaved to form a uniform array on AC-F, and a higher magnification micrograph highlights Mo2The size of the C-MoC/G-N nano-sheet is about 5 nm. Panel c in FIG. 2 shows beautiful filamentous nanoplatelets encapsulating AC-F. The nanoplatelets are very thin, giving a graphene-like structure. The nano sheets are mutually staggered to present a 3D network structure. The nanoplatelets were approximately 5nm, which is consistent with SEM micrographs. The higher magnification image shows the presence of amorphous carbon, short range ordered carbon and MoxC flakes. D in FIG. 2 shows Mo2The C-layer spacing was about 0.229nm, which corresponds to XRD PDF # 35-0787. Mo2The carbon lattice at the bottom of C is visible, demonstrating that they adhere to the graphite nanoplatelets in a flake shape.
Referring to FIG. 3, Mo2The rate performance of the C-MoC/AC-N and AC-F electrodes was evaluated by the process of potassium evolution and potassium recession. At current densities of 0.05, 0.1, 0.2, 0.5, 1.0, 2.0 and 5.0A g-1Under the condition of (1), Mo2The reversible capacities of the C-MoC/AC-N electrodes were 440.8, 356.4, 275.7, 206.8, 175.2, 146.9 and 122.3mA h g-1. Its capacity at each current density is much greater than that of an AC-F electrode. After 70 cycles at different current densities, the current density was 0.05A g-1When the capacity is recovered to 354.5mA h g-1。
In conclusion, the method has novel design idea, and the functionalized active carbon, the 2, 3-pyridinedicarboxylic acid and the CoCl are2·6H2And (2) uniformly mixing the urea and the ammonium molybdate, preparing a precursor in a muffle furnace, then putting the precursor into a tube furnace, carbonizing the precursor at high temperature in an argon environment to prepare the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material, and growing the molybdenum and nitrogen double-doped carbon nanosheets on the surface and the mesopores of the activated carbon in situ by taking the activated carbon as a carrier to generate the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material. The method is green and environment-friendly, has short production period, low energy consumption and easily obtained raw materials, and is beneficial to large-scale production. The activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material prepared by the method has high purity, and is 0.05A g as a potassium ion battery cathode material-1Capacity at current density of 457.5mA hr g-1At 5A g-1The capacity under large current is 144.4mA h g-1And the loss rate of each circulation capacity is 0.49 per mill, so that the lithium ion battery can be widely used as a negative electrode material of a potassium ion battery.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims (8)

1. A preparation method of an activated carbon-loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material is characterized by comprising the following steps:
1) 2, 3-pyridinedicarboxylic acid, CoCl2·6H2Mixing O, urea, molybdic acid and the functionalized activated carbon uniformly to prepare a mixture;
2) heating the mixture from room temperature to 100-200 ℃, carrying out heat preservation treatment for 10-60 min, then heating to 200-300 ℃, carrying out heat preservation treatment for 1-3 h, and cooling to room temperature;
3) heating the product treated in the step 2) from room temperature to 500-700 ℃ under the argon atmosphere, carrying out heat preservation treatment for 10-60 min, then heating to 700-1000 ℃, carrying out heat preservation for 1-4 h, and cooling to room temperature;
4) cleaning and drying the product treated in the step 3) to obtain the activated carbon loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material.
2. The preparation method of the activated carbon supported molybdenum and nitrogen double-doped carbon nanosheet array composite material according to claim 1, wherein in step 1), 2, 3-pyridinedicarboxylic acid and CoCl are added2·6H2The mass ratio of the O, the urea, the molybdic acid and the activated carbon after the functionalization treatment is (1-2): (0.75-1.5): (1.5-3): (0.1-0.25): (0.5 to 1).
3. The preparation method of the activated carbon-loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material according to claim 1 or 2, wherein the activated carbon after the functionalization treatment is prepared by placing the activated carbon in HNO with the concentration of 2-8mol/L3Heating the solution in water bath at 40-80 ℃ for 10-40 h to obtain the product.
4. The preparation method of the activated carbon-supported molybdenum and nitrogen double-doped carbon nanosheet array composite material according to claim 1, wherein the step 2) is carried out in a muffle furnace, the temperature of the mixture is raised to 100-200 ℃ from room temperature at a temperature raising rate of 5-15 ℃/min, the mixture is subjected to heat preservation treatment for 10-60 min, and then the mixture is heated to 200-300 ℃ at a temperature raising rate of 5-15 ℃/min.
5. The preparation method of the activated carbon-loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material according to claim 1, wherein the step 3) is carried out in a tube furnace, and the product treated in the step 2) is heated to 500-700 ℃ at a heating rate of 5-15 ℃/min from room temperature and is kept for 10-60 minutes; then heating to 700-1000 ℃ at a heating rate of 5-15 ℃/min.
6. The activated carbon supported molybdenum and nitrogen double-doped carbon nanosheet array composite material prepared by the preparation method of any one of claims 1-5.
7. The application of the activated carbon-supported molybdenum and nitrogen double-doped carbon nanosheet array composite material of claim 6 in preparation of a potassium ion battery negative electrode material.
8. A potassium ion battery negative electrode material is characterized in that the potassium ion battery negative electrode material is prepared from the activated carbon-loaded molybdenum and nitrogen double-doped carbon nanosheet array composite material of claim 6, and the cycle performance of the potassium ion battery negative electrode material under the current density of 50mA/g is as follows: the first circle reaches 457.5mAh/g, and the first circle is circulated for 100 circles and then is stabilized at 383.1 mAh/g; under the condition of a large current density of 5A/g, the high capacity is 144.4mAh/g, and the loss rate of each circulation capacity is 0.49 per thousand.
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