CN110828802A - Preparation method of high-power aqueous zinc ion battery positive electrode material - Google Patents

Preparation method of high-power aqueous zinc ion battery positive electrode material Download PDF

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CN110828802A
CN110828802A CN201911081090.0A CN201911081090A CN110828802A CN 110828802 A CN110828802 A CN 110828802A CN 201911081090 A CN201911081090 A CN 201911081090A CN 110828802 A CN110828802 A CN 110828802A
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positive electrode
ion battery
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electrode material
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CN110828802B (en
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吴贤文
唐芳
龙凤妮
周世昊
向延鸿
吴显明
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Hefei Minglong Electronic Technology Co ltd
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Jishou University
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    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/0007—Electro-spinning
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    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
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    • D01D5/0007—Electro-spinning
    • D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
    • D01D5/0076—Electro-spinning characterised by the electro-spinning apparatus characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid
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Abstract

The invention discloses a preparation method of a high-power water-based zinc ion battery anode material, which comprises the steps of adding manganese salt, a sulfur-containing compound, polyacrylonitrile and/or polyvinylpyrrolidone into ethanol or N, N-dimethylformamide, then adding graphene oxide, preparing an electrostatic spinning solution, then preparing a precursor through electrostatic spinning, and carrying out vacuum drying; and pre-oxidizing the precursor in an air atmosphere to cure the fibers, calcining the fibers in a high-temperature inert atmosphere, and naturally cooling the fibers to room temperature to prepare the graphene-coated manganese sulfide and nitrogen-doped carbon nanofiber composite cathode material. The composite positive electrode material is applied to the field of water-system zinc ion batteries, and the positive electrode of the battery has high specific capacity, excellent cycle stability and high-rate charge and discharge characteristics; and the adopted raw materials have wide sources and low price, and the market economy is good.

Description

Preparation method of high-power aqueous zinc ion battery positive electrode material
Technical Field
The invention belongs to the technical field of water-system zinc ion batteries, and relates to a preparation method of a high-power water-system zinc ion battery anode material.
Background
The green rechargeable battery with high power, high safety and low cost has wide application prospect in the fields of large-scale energy storage and power batteries. However, the lithium ion battery adopts toxic organic electrolyte, so that the lithium ion battery is flammable and explosive, has poor safety performance, and has scarce lithium resources and higher cost; lead-acid batteries and nickel-cadmium batteries use heavy metals, and are recycled to pollute the environment. On the contrary, the water-based zinc ion battery in a weak acid system has the advantages of simple assembly process, low cost, high power density and the like, and is a hot spot of current secondary water-based battery research.
The anode materials of the aqueous zinc-ion battery reported so far mainly include manganese-based compounds, vanadium-based compounds, prussian blue derivatives, Chevrel phase compounds, and the like. However, the vanadium-based compound has higher specific capacity, but lower zinc potential and low battery output voltage; the prussian blue derivative uses a toxic cyano compound, the specific capacity of an electrode is only about 80mAh/g, and the energy density of the battery is low; chevrel phase compounds are predominantly Mo6S8And the like, and has a high potential for zinc, and is inferior to a negative electrode as compared with a positive electrode. The manganese-based compound has rich raw material sources, low cost, higher electrode potential, poor conductivity, poor rate capability and quick specific capacity attenuation in the circulating process. Therefore, the finding of a novel anode material of the water system zinc ion battery, which has low cost, high capacity, high power and good cycling stability, is of great significance.
Disclosure of Invention
In order to achieve the purpose, the invention provides a preparation method of a high-power water system zinc ion battery anode material, the composite anode material is applied to the field of water system zinc ion batteries, and the battery anode has high specific capacity, excellent cycle stability and high-rate charge-discharge characteristics; and the adopted raw materials have wide sources and low price, and the market economy is good.
The technical scheme adopted by the invention is that the preparation method of the high-power water system zinc ion battery anode material comprises the following steps:
step 1, dissolving one or two high molecular compounds in an organic solvent, adding manganese salt and a sulfur-containing compound after fully stirring and dissolving, continuously stirring until the raw materials are dissolved, then adding graphene oxide, performing ultrasonic dispersion, and preparing an electrostatic spinning solution;
step 2, carrying out electrostatic spinning on the electrostatic spinning solution, collecting an electrostatic spinning product by using an aluminum foil, and carrying out vacuum drying; pre-oxidizing the precursor in air atmosphere, and curing the fiber; and then calcining the mixture in a high-temperature inert atmosphere, and naturally cooling the mixture to room temperature to prepare the composite cathode material of the graphene-coated manganese sulfide and the nitrogen-doped carbon nanofiber.
Further, in step 1, the polymer compound is polyacrylonitrile and/or polyvinylpyrrolidone, and the organic solvent is ethanol or N, N-dimethylformamide.
Further, the manganese salt is manganese acetate, manganese sulfate or manganese nitrate, and the sulfur-containing compound is thioacetamide or thiourea.
Further, the mass ratio of the two macromolecules is 100: 0-0: 100, and the mass percentage of the macromolecule compound to the mass of the organic solvent is 7-12%.
Further, the molar ratio of the manganese salt to the sulfur-containing compound is 1: 2.
Further, in the step 2, the electrostatic spinning conditions are as follows: the receiving device is a 50mm aluminum roller, the rotating speed of the roller is 50r/min, the receiving distance is 15cm, the electrostatic spinning voltage is 5-20 KV, the advancing speed of the electrostatic spinning solution in the injector is 0.1mm/min, the temperature is 25 ℃, and the humidity is 20-50%.
Further, in the step 2, in the pre-oxidation treatment process of the precursor, the temperature rise rate is 1-3 ℃/min, the oxidation temperature is controlled at 200-280 ℃, and the oxidation treatment is carried out for 2-5 hours in the air atmosphere.
Further, in the step 2, in the calcining process, the sintering temperature is controlled to be 500-800 ℃, the inert atmosphere is argon or nitrogen, the heating rate is 2-5 ℃/min, and the calcining time is 2-6 h.
The high molecular compound mainly provides a fiber framework of the composite anode material, the high molecular compound is required to have large molecular weight and high mechanical strength, the organic solvent is required to ensure that the high molecules are completely dissolved, the formed spinning solution has moderate viscosity, the proper viscosity is convenient for subsequent electrostatic spinning, and simultaneously, the high mechanical strength and the low possibility of breakage of fibers obtained by pre-oxidation can be ensured after the solvent is volatilized. The manganese salt and the sulfur-containing compound are main raw materials for synthesizing the composite anode material, the sulfur-containing compound is slowly hydrolyzed to generate sulfur ions, and finally the sulfur ions react with the manganese salt to generate manganese sulfide, and the obtained manganese sulfide is required to be uniform in particle size. The graphene oxide forms graphene in the reaction process, and the graphene oxide is used as a coating layer of the composite anode material, so that the conductivity of the anode material can be improved, the direct contact between the anode material and an electrolyte can be isolated, and the dissolution of manganese is inhibited.
The invention has the beneficial effects that: the composite cathode material of the graphene-coated manganese sulfide and nitrogen-doped carbon nanofiber is prepared based on the electrostatic spinning method and the calcining process, so that the conductivity of the cathode of the battery is improved, and the polarization phenomenon of the electrode is reduced, so that the specific capacity, the rate capability and the power performance of the cathode of the battery are improved; meanwhile, the graphene coating structure isolates the direct contact between the positive electrode of the battery and the electrolyte, and inhibits the dissolution of manganese, so that the cycling stability of the battery is improved; the manganese salt serving as the main raw material of the composite anode material is wide in source and low in price, so that the composite anode material is low in preparation cost and good in market economy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an XRD pattern of MnS composite;
fig. 2 is the rate capability of MnS anodes at different current densities.
Detailed Description
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.
Example 1
0.7g of polyvinylpyrrolidone was dissolved in 10g N, N-dimethylformamide, and after sufficient stirring and dissolution, 2mmol of manganese acetate and 4mmol of thioacetamide were added. Continuously stirring until the raw materials are dissolved, then adding 50mg of graphene oxide, performing ultrasonic dispersion, and preparing an electrostatic spinning solution; and (3) carrying out electrostatic spinning on the electrostatic spinning solution, wherein a receiving device is a 50mm aluminum roller, the rotating speed of the roller is 50r/min, the receiving distance is 15cm, the electrostatic spinning voltage is 5KV, the advancing speed of the spinning solution in an injector is 0.1mm/min, the temperature is 25 ℃, and the humidity is 20%. The electrospun product was collected with aluminum foil and dried in vacuum.
Heating the precursor to 280 ℃ at the speed of 1 ℃/min under the air atmosphere for preoxidation treatment for 2h, wherein the purpose of the treatment is to solidify fibers; and then calcining for 2h at 500 ℃ in an argon atmosphere, with the heating rate of 2 ℃/min, and naturally cooling to room temperature to prepare the composite cathode material of graphene-coated manganese sulfide and nitrogen-doped carbon nanofiber.
The XRD of the composite positive electrode material is shown in fig. 1. As can be seen from fig. 1, the main peaks (111), (200), (220) and (222) are consistent with MnS standard card, and have sharp peak shape and high peak intensity.
The prepared composite anode material is mixed with acetylene black serving as a conductive agent and polyvinylidene fluoride serving as a binder, and the mixture is coated on conductive carbon paper, so that the conductive carbon paper serves as an anode, a commercial zinc sheet serves as a cathode, 2mol/L zinc sulfate serves as electrolyte, a glass fiber membrane serves as a diaphragm, a water-based zinc ion battery is formed, the rate performance of the water-based zinc ion battery is shown in figure 2, as can be seen from figure 2, the specific capacity of the anode material under the current density of 0.1A/g is 257.8mAh/g, the specific capacity of the anode material is still as high as 114.9mAh/g even under the current density of 2A/g, and the excellent high-current charging and discharging characteristics are shown. The conductivity of the manganese sulfide is improved mainly due to the fact that the graphene, the nitrogen-doped carbon nanofiber and the high-current charge-discharge characteristics of the electrode are improved.
Example 2
Dissolving 0.5g of polyacrylonitrile and 0.5g of polyvinylpyrrolidone in 10g N, dissolving N-dimethylformamide, fully stirring and dissolving, adding 6mmol of manganese sulfate and 12mmol of thiourea, continuously stirring until the raw materials are dissolved, adding 50mg of graphene oxide, performing ultrasonic dispersion, and preparing an electrostatic spinning solution; and (3) carrying out electrostatic spinning on the electrostatic spinning solution, wherein a receiving device is a 50mm aluminum roller, the rotating speed of the roller is 50r/min, the receiving distance is 15cm, the electrostatic spinning voltage is 12KV, the advancing speed of the spinning solution in an injector is 0.1mm/min, the temperature is 25 ℃, and the humidity is 40%. The electrospun product was collected with aluminum foil and dried in vacuum.
Heating the precursor to 240 ℃ at the speed of 2 ℃/min under the air atmosphere for pre-oxidation treatment for 3.5 h; and then calcining for 6 hours at 600 ℃ in an argon atmosphere, with the heating rate of 3.5 ℃/min, and naturally cooling to room temperature to prepare the composite cathode material of graphene-coated manganese sulfide and nitrogen-doped carbon nanofiber.
The prepared composite anode material is mixed with acetylene black serving as a conductive agent and polyvinylidene fluoride serving as a binder, and the mixture is coated on conductive carbon paper, so that the conductive carbon paper serves as an anode, a commercial zinc sheet serves as a cathode, 2mol/L zinc sulfate serves as electrolyte, a glass fiber membrane serves as a diaphragm, and the specific capacity of the composite anode material is still up to 102.4mAh/g under the current density of 2A/g.
Example 3
Dissolving 1.2g of polyacrylonitrile in 10g of ethanol, fully stirring and dissolving, adding 5mmol of manganese nitrate and 10mmol of thioacetamide, continuously stirring until the raw materials are dissolved, then adding 50mg of graphene oxide, and performing ultrasonic dispersion to prepare an electrostatic spinning solution; and (3) carrying out electrostatic spinning on the electrostatic spinning solution, wherein a receiving device is a 50mm aluminum roller, the rotating speed of the roller is 50r/min, the receiving distance is 15cm, the electrostatic spinning voltage is 20KV, the advancing speed of the spinning solution in an injector is 0.1mm/min, the temperature is 25 ℃, and the humidity is 50%. The electrospun product was collected with aluminum foil and dried in vacuum.
Heating the precursor to 200 ℃ at the speed of 3 ℃/min under the air atmosphere for pre-oxidation treatment for 5 h; and then calcining for 3.5h at 800 ℃ in a nitrogen atmosphere, wherein the heating rate is 5 ℃/min, and naturally cooling to room temperature to prepare the composite cathode material of the graphene-coated manganese sulfide and nitrogen-doped carbon nanofiber.
The self-made composite anode material is mixed with acetylene black serving as a conductive agent and polyvinylidene fluoride serving as a binder, and the mixture is coated on conductive carbon paper, so that the conductive carbon paper serves as an anode, a commercial zinc sheet serves as a cathode, 2mol/L zinc sulfate serves as electrolyte, a glass fiber membrane serves as a diaphragm, and the specific capacity of the conductive carbon paper is still up to 112.5mAh/g under the current density of 2A/g.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (8)

1. A preparation method of a high-power aqueous zinc ion battery positive electrode material is characterized by comprising the following steps:
step 1, dissolving one or two high molecular compounds in an organic solvent, adding manganese salt and a sulfur-containing compound after fully stirring and dissolving, continuously stirring until the raw materials are dissolved, then adding graphene oxide, performing ultrasonic dispersion, and preparing an electrostatic spinning solution;
step 2, carrying out electrostatic spinning on the electrostatic spinning solution, collecting an electrostatic spinning product by using an aluminum foil, and carrying out vacuum drying; pre-oxidizing the precursor in air atmosphere, and curing the fiber; and then calcining the mixture in a high-temperature inert atmosphere, and naturally cooling the mixture to room temperature to prepare the composite cathode material of the graphene-coated manganese sulfide and the nitrogen-doped carbon nanofiber.
2. The preparation method of the high-power water-based zinc ion battery positive electrode material according to claim 1, wherein in the step 1, the high molecular compound is polyacrylonitrile and/or polyvinylpyrrolidone, and the organic solvent is ethanol or N, N-dimethylformamide.
3. The preparation method of the high-power aqueous zinc-ion battery positive electrode material as claimed in claim 1, wherein the manganese salt is manganese acetate, manganese sulfate or manganese nitrate, and the sulfur-containing compound is thioacetamide or thiourea.
4. The preparation method of the high-power aqueous zinc ion battery positive electrode material as claimed in claim 1 or 2, wherein the mass ratio of the two polymers is 100: 0-0: 100, and the mass percentage of the polymer compound to the mass of the organic solvent is 7-12%.
5. The preparation method of the high-power aqueous zinc ion battery positive electrode material according to claim 1 or 3, wherein the molar ratio of the manganese salt to the sulfur-containing compound is 1: 2.
6. The preparation method of the high-power aqueous zinc-ion battery positive electrode material according to claim 1, wherein in the step 2, the electrostatic spinning conditions are as follows: the receiving device is a 50mm aluminum roller, the rotating speed of the roller is 50r/min, the receiving distance is 15cm, the electrostatic spinning voltage is 5-20 KV, the advancing speed of the electrostatic spinning solution in the injector is 0.1mm/min, the temperature is 25 ℃, and the humidity is 20-50%.
7. The preparation method of the high-power aqueous zinc ion battery positive electrode material according to claim 1, wherein in the step 2, in the pre-oxidation treatment process of the precursor, the temperature rise rate is 1-3 ℃/min, the oxidation temperature is controlled at 200-280 ℃, and the oxidation treatment is carried out for 2-5 h in the air atmosphere.
8. The preparation method of the high-power water-based zinc ion battery positive electrode material according to claim 1, wherein in the step 2, in the calcining process, the sintering temperature is controlled to be 500-800 ℃, the inert atmosphere is argon or nitrogen, the heating rate is 2-5 ℃/min, and the calcining time is 2-6 h.
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CN112038613A (en) * 2020-09-17 2020-12-04 贵州大学 Modification method for realizing doped coating of high-nickel ternary cathode material by preprocessing precursor
CN112490396A (en) * 2020-12-18 2021-03-12 吉林大学 Metal zinc cathode, preparation method thereof and water-based zinc ion battery
CN113113620A (en) * 2021-04-16 2021-07-13 龙泉市强宏环保科技有限公司 Preparation method of alkaline zinc-iron flow battery
CN114014368A (en) * 2021-11-03 2022-02-08 东莞理工学院 Nitrogen-doped carbon-coated manganese sulfide composite negative electrode material and preparation method and application thereof
CN114204019A (en) * 2021-11-23 2022-03-18 五邑大学 Battery positive electrode material and preparation method and application thereof
CN114335471A (en) * 2021-12-30 2022-04-12 石河子大学 Preparation method of manganous oxide composite material for water-based zinc ion battery

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