CN115159852A - Preparation method and application of iron phosphate microcrystalline glass electrode material - Google Patents
Preparation method and application of iron phosphate microcrystalline glass electrode material Download PDFInfo
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- CN115159852A CN115159852A CN202210583139.8A CN202210583139A CN115159852A CN 115159852 A CN115159852 A CN 115159852A CN 202210583139 A CN202210583139 A CN 202210583139A CN 115159852 A CN115159852 A CN 115159852A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/10—Forming beads
- C03B19/1005—Forming solid beads
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B32/00—Thermal after-treatment of glass products not provided for in groups C03B19/00, C03B25/00 - C03B31/00 or C03B37/00, e.g. crystallisation, eliminating gas inclusions or other impurities; Hot-pressing vitrified, non-porous, shaped glass products
- C03B32/02—Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C12/00—Powdered glass; Bead compositions
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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
- H01M4/58—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
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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- 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 discloses a preparation method and application of an iron phosphate microcrystalline glass electrode material, and belongs to the field of preparation of anode materials of lithium ion batteries. The method comprises the following steps: step 1: fePO is reacted with 4 ·2H 2 And (3) drying the O raw material, melting at high temperature to obtain a melt, and then performing water quenching and drying to obtain the mother glass. Step 2: and carrying out heat treatment on the parent glass according to the glass transition temperature and the glass crystallization peak temperature in the DTA curve of the parent glass to obtain crystallized glass. And step 3: grinding the crystallized glass, mixing the ground crystallized glass with acetylene black and PVDF, adding a dispersant, fully mixing, and scraping the mixtureAnd (5) placing the plate on an aluminum foil, and drying in vacuum to obtain the standard pole piece. The lithium ion battery anode material prepared by the method has the advantages of simple process operation, environmental friendliness and easiness in realizing large-scale industrial production. Meanwhile, the FePO can be relieved due to the unique open network structure of the glass matrix 4 The volume change of the microcrystalline glass anode material in the electrochemical cycle process greatly improves the transmission rate of lithium ions and the cycle stability of the electrode.
Description
Technical Field
The invention relates to the field of preparation of electrode materials of lithium ion batteries, in particular to a preparation method and application of an iron phosphate microcrystalline glass electrode material.
Background
With the exhaustion of the current non-renewable energy sources, lithium ion batteries are widely used in the fields of electronic devices, hybrid electric vehicles and energy grids due to their portability, reversible charge-discharge and cleaning properties. With the development of social economy, higher requirements are put forward on the safety, stability, energy density and cycle life of the lithium ion battery. The first is the supply of raw materials, particularly the storage capacity of the earth crust of lithium, iron and cobalt, which are involved in lithium ion batteries, is low, and price fluctuations are large in recent years. In order to solve these problems, designing a new electrode material having high electrochemical reaction power and long cycle life has been a goal pursued for practical industrial production.
Olivine structured ferric phosphate FePO 4 Has the characteristics of higher lithium ion storage capacity (178 mAh/g), environmental friendliness and low price, and becomes a candidate material of the reversible lithium ion battery anode material. FePO iron phosphate 4 The synthesis method comprises a solid-phase reaction method, a hydrothermal method, a sol-gel method, a high-temperature water quenching method and the like. Ferric phosphate FePO is obtained by adopting a high-temperature water quenching method 4 The microcrystalline glass has simple process operation and is easy to realize large-scale industrial production. The phosphate glass mainly contains P 2 O 5 Glass material of (2), P 2 O 5 Is a glass network former which can form glass independently and has a basic structural unit of [ PO ] 4 ]Tetrahedrons are connected through oxygen ion common vertex. Since the chemical valence of phosphorus is +5, one of the tetrahedra will exist with P 5+ With doubly-bound nonbridging oxygen, so that [ PO ] 4 ]The bridge oxygen in tetrahedron can only be associated with three other [ PO ] 4 ]The bodies are shared. Pure P 2 O 5 The glass has poor chemical stability, but can be modified by doping other oxidesIt is good for structural performance of glass. For iron-phosphorus binary system glasses, fe is present under annealing conditions 2 O 3 -P 2 O 5 Fe in glass 2 O 3 The maximum molar content of (b) is 50mol%. The microstructure of the porous structure of the glass is easy to introduce the insertion and the extraction of lithium ions in the electrochemical reaction process of the electrode of the lithium ion battery.
In this report, fePO was used for the experiments 4 ·2H 2 The FePO is prepared by taking O as a raw material through a method of melt-water quenching-heat treatment 4 A crystallized glass ceramic. The unique open network structure of the glass matrix can relieve FePO 4 The volume change of the anode material in the electrochemical cycle process is beneficial to improving the transmission rate of lithium ions and the cycle stability of the electrode.
Disclosure of Invention
Aiming at the defects of the existing electrode material and technology, the invention aims to provide a preparation method and application of an iron phosphate electrode material, and FePO containing prepared by the method 4 The microcrystalline glass with the crystalline phase has simple process operation and environmental friendliness, and is easy to realize large-scale industrial production. The prepared material also has excellent lithium storage performance, and the FePO of iron phosphate can be relieved by the open network structure of the glass matrix in the material 4 The volume change of the nanocrystalline material generated in the electrochemical cycle process greatly improves the transmission rate of lithium ions and the cycle stability of the electrode.
In order to solve the above problems, the present invention provides the following solutions:
the invention provides an iron phosphate microcrystalline glass electrode material which is characterized by comprising the following steps:
step 1: a certain amount of FePO is added 4 ·2H 2 Drying O raw material at 100-140 deg.C for 12-24 hr, placing into an alumina crucible, placing in a muffle furnace, heating to 1000-1200 deg.C at a heating rate of 8-10 deg.C/min, maintaining for 1-2 hr, taking out at high temperature with crucible tongs, directly pouring into tap water, rapidly cooling to obtain water-quenched glass, and cooling at 60-80 deg.CDrying for 12-24 hours under the condition to obtain the mother glass.
And 2, step: grinding a certain amount of the mother glass in the step 1 into a sample of 120-140 meshes, carrying out DTA test on the sample by using an HCT-4 type comprehensive thermal analyzer to obtain a DTA curve of the mother glass, then raising the temperature of the mother glass to the glass transition temperature thereof at a heating rate of 8-10 ℃/min for heat treatment for 1-2 hours, then continuing to raise the temperature to the first crystallization peak temperature (or 20 ℃ higher than the first crystallization peak temperature of the glass) for heat treatment for 1-2 hours, and then cooling along with a furnace to obtain the crystallized glass.
And step 3: grinding a certain amount of crystallized glass obtained in the step 2 until no obvious granular sensation exists, then placing the crystallized glass in a mortar, mixing the crystallized glass with acetylene black and PVDF according to the mass ratio of (6-8): (3-1): 1 for 30-60 minutes, then placing the uniformly mixed sample into a miniature transparent reagent bottle with magnetons, adding 1-1.5ml of polyvinylpyrrolidone or a mixed solution dispersing agent of absolute ethyl alcohol and water, stirring and mixing the mixture on a magnetic stirrer for 12-18 hours, dripping the mixture on an aluminum foil after the mixture is fully mixed, uniformly scraping the sample from the head to the tail by a scraper with the height of 100-150 mu m at one time, uniformly spreading the sample on the aluminum foil, and drying the aluminum foil after the scraper at the temperature of 80-100 ℃ for 12-14 hours to obtain the battery pole piece.
Preferably, the drying temperature of the raw material is 100-140 ℃, the drying time is 12-24 hours, preferably 140 ℃,12 hours, the preferred high-temperature melting process is heated to 1000-1200 ℃ at a heating rate of 8-10 ℃/min, and is kept for 1-2 hours, preferably heated to 1150 ℃ at a heating rate of 10 ℃/min, and is kept for 1 hour, preferably, the drying temperature of the water-quenched glass is 60-80 ℃, the time is 12-24 hours, preferably, 80 ℃,12 hours, preferably, the heat treatment system is heated to the glass transition temperature thereof at a heating rate of 8-10 ℃/min for 1-2 hours, then is continuously heated to the first crystallization peak temperature (or is 20 ℃ higher than the first crystallization peak temperature of the glass) for 1-2 hours, preferably, is heated to the glass transition temperature thereof for 1 hour at a heating rate of 10 ℃/min, and then is continuously heated to the first crystallization peak temperature (or is 20 ℃ higher than the first crystallization peak temperature of the glass) for 1 hour. Preferably, the mass mixing ratio of the sample to the acetylene black and PVDF is (6-8): (3-1): 1, and the sample is ground and mixed in a mortar for 30-60 minutes, preferably 7:2:1, mixing for 30 minutes, preferably, the dispersant is polyvinylpyrrolidone or a mixed solution of absolute ethyl alcohol and water, the adding amount is about 1-1.5ml, the stirring time is 12-18 hours, preferably polyvinylpyrrolidone, 1.25ml and 12 hours, preferably, the gap height of a scraper is 100-150um, preferably, the vacuum drying system is as follows: the drying temperature is 80-100 deg.C, and the drying time is 12-14 hr, preferably 80 deg.C, and 12 hr.
Compared with the prior materials and technologies, the invention has the beneficial effects that:
the phosphate prepared by the invention has good crystallization property as the lithium ion battery anode material, and experiments show that FePO 4 ·2H 2 All crystal phases of O devitrified glass sample are FePO 4 . By XRF analysis, fePO 4 ·2H 2 The O sample element is mainly Fe 2 O 3 And P 2 O 5 And the main crystal phase in XRD analysis is FePO 4 And (4) the same. Meanwhile, scanning electron microscope images show uniformly distributed granular crystals. The lithium ion button type half cell assembled by the material and taking the lithium sheet as the counter electrode has lower alternating current impedance and good electronic conduction performance, and the charging and discharging specific capacity is stable at 103mAh g -1 And the material has good cyclic performance, and cyclic voltammetry tests can show that the material has good reversible charge and discharge performance. In addition, the preparation method is simple, easy to operate and easy to realize industrial popularization and commercial application.
Drawings
FIG. 1 is a DTA curve of an iron phosphate glass.
FIG. 2 is an XRD pattern of iron phosphate glass after different heat treatments.
FIG. 3 is a scanning electron micrograph of the iron phosphate glass after different heat treatments.
Fig. 4 is a graph of ac impedance of cells assembled using iron phosphate glass with different heat treatment materials.
Fig. 5 is a graph of constant current charge and discharge test performance of batteries assembled using iron phosphate glass with different heat treatment materials.
Fig. 6 is a graph of cyclic voltammetry tests for assembled cells using iron phosphate glass materials.
Detailed Description
In order to make the materials and technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description will be given with reference to the accompanying drawings and specific examples.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments. If the experimental conditions not specified in the examples are specified, the conditions are generally conventional or recommended by the reagent company; reagents, consumables, and the like used in the following examples are commercially available unless otherwise specified.
The invention provides a preparation method and application of an iron phosphate microcrystalline glass electrode material, and specific embodiments are as follows.
Example 1
A preparation method of an iron phosphate microcrystalline glass electrode material comprises the following steps:
1. preparation of mother glass
A certain amount of FePO is added 4 ·2H 2 Drying the O raw material at the temperature of 140 ℃ for 12 hours, putting the O raw material into an alumina crucible, placing the alumina crucible into a muffle furnace, heating to 1150 ℃ at the heating rate of 10 ℃/min, keeping the temperature for 1 hour, taking out the O raw material at high temperature by using crucible tongs, directly pouring the O raw material into tap water, rapidly cooling to obtain water-quenched glass, and drying the obtained water-quenched glass at the temperature of 80 ℃ for 12 hours to obtain parent glass.
2. Production of devitrified glasses
Grinding a certain amount of the mother glass obtained in the step 1 into a sample of 120-140 meshes, carrying out DTA test on the sample by using an HCT-4 type comprehensive thermal analyzer to obtain a DTA curve of the mother glass, then raising the temperature of the mother glass to 495 ℃ of the glass transition temperature of the mother glass at the heating rate of 10 ℃/min for heat treatment for 1 hour, then continuing to raise the temperature to 560 ℃ of the first crystallization peak temperature for heat treatment for 1 hour, and then cooling along with the furnace to obtain the crystallized glass.
3. Preparation of Pole pieces
Grinding a certain amount of devitrified glass in the step 2 until no obvious granular sensation exists, then weighing 57.14 mg of acetylene black and 28.57 mg of PVDF according to a mass ratio of the sample to the acetylene black and the PVDF being 7. After the completion of the mixing, the mixture was put into a micro transparent reagent bottle with magnetons and 1.25ml of NMP was added as a dispersant, followed by stirring on a magnetic stirrer for 12 hours. And dropping the sample which is uniformly stirred and mixed on the aluminum foil, and uniformly scraping the sample from the head to the tail by using a scraper of 150 mu m at one time to uniformly tile the sample on the aluminum foil. And then putting the aluminum foil into a vacuum drying oven at 80 ℃, and drying for 12 hours to obtain the battery pole piece.
Example 2
A method for simply and controllably synthesizing an iron phosphate lithium ion battery anode material comprises the following steps:
1. preparation of mother glass
A certain amount of FePO is added 4 ·2H 2 Drying the O raw material for 12 hours at the temperature of 140 ℃, then placing the O raw material into an alumina crucible, placing the alumina crucible into a muffle furnace, heating to 1150 ℃ at the heating rate of 10 ℃/min, preserving heat for 1 hour, taking out the O raw material at high temperature by using crucible tongs, directly pouring the O raw material into tap water, rapidly cooling to obtain water-quenched glass, and drying the obtained water-quenched glass for 12 hours at the temperature of 80 ℃ to obtain parent glass.
2. Production of devitrified glasses
Grinding a certain amount of the mother glass obtained in the step 1 into a sample of 120-140 meshes, carrying out DTA test on the sample by using an HCT-4 type comprehensive thermal analyzer to obtain a DTA curve of the mother glass, then raising the temperature of the mother glass to 495 ℃ at a heating rate of 10 ℃/min for heat treatment for 1 hour, then continuously raising the temperature to 580 ℃ higher than the first crystallization peak temperature of the glass by 20 ℃ for heat treatment for 1 hour, and then cooling along with a furnace to obtain crystallized glass.
3. Preparation of pole piece
Grinding a certain amount of devitrified glass in the step 2 until no obvious granular sensation exists, then weighing 57.14 mg of acetylene black and 28.57 mg of PVDF according to a mass ratio of the sample to the acetylene black and the PVDF being 7. After the mixing was completed, the mixture was put into a micro transparent reagent bottle with magneton and 1.25ml of NMP was added as a dispersant, followed by stirring on a magnetic stirrer for 12 hours. The sample which is stirred and mixed evenly is dripped on the aluminum foil, and the sample is scraped to the tail from the head by a scraper of 150um, so that the sample is evenly spread on the aluminum foil. And then putting the aluminum foil into a vacuum drying oven at 80 ℃, and drying for 12 hours to obtain the battery pole piece.
The iron phosphate lithium ion battery positive electrode material pole piece obtained according to the embodiment 1-2 is applied as a lithium ion battery positive electrode, and the specific application method is as follows:
the positive electrode material of the iron phosphate lithium ion battery prepared in example 1-2 was assembled in a glove box in sequence according to the sequence of the negative electrode case, the electrode piece, the electrolyte, the diaphragm, the lithium piece, the gasket, the spring gasket and the positive electrode case. After the assembly is completed, each battery is sealed in the sealing bag and taken out of the glove box, so that the battery is prevented from contacting with air. (the glove box is always in pure argon atmosphere, the assembly process is carried out, gloves are worn in the whole process, the operation is carried out by using tweezers, pole pieces, diaphragms, lithium pieces, gaskets, spring gaskets and dropwise added electrolyte are assembled to be located at the middle positions as far as possible, the adding amount of the electrolyte is 70 ul), the assembled half-cell is punched, and a manual sealing machine is used for punching and sealing the cell, wherein the model of the manual sealing machine is MSK-160D. And then standing for more than 12 hours, and carrying out battery performance tests including alternating current impedance tests, charge and discharge tests and cyclic voltammetry tests.
A602-3008W-3UIF-B battery charge and discharge tester is selected for carrying out charge and discharge tests. The test voltage is 0.01-3.0V.
A Parstat 2263 electrochemical workstation is selected to carry out Cyclic Voltammetry (CV) curves and alternating current impedance tests. The frequency of the test range of the alternating current impedance is 10mHz-100kHz, and the voltage interval of the cyclic voltammetry test is 1.8-4.2V.
The characteristics of the prepared iron phosphate lithium ion battery anode material and the battery performance of the iron phosphate lithium ion battery anode material are shown in attached figures
Comparative example 1
In example 2, only the first crystallization peak temperature at the time of heat treatment of the mother glass was changed, and the other conditions were the same as in example 1.
XRD test results of samples of the iron phosphate microcrystalline glass prepared by the invention after different heat treatments show that the main crystal phases of the samples are FePO 4 The scanning electron microscope image test result shows that the crystal precipitated from the sample at 560 ℃ is similar to the structure of plant cell walls, more glassy substances are present, and the crystal precipitated at 580 ℃ is in granular uniform distribution. As shown in fig. 3 (560 ℃ sample on the left, 580 ℃ sample morphology on the right). The ac impedance test results of the prepared batteries show that: the resistance of the sample is slightly less than 580 ℃ when the sample is subjected to heat treatment at 560 ℃, namely the lithium ion conductivity of the sample subjected to high-temperature crystallization at 580 ℃ is higher than that of the sample subjected to high-temperature crystallization at 560 ℃. The constant current charge and discharge test result shows that: discovery of FePO 4 ·2H 2 When the O sample is subjected to heat treatment at 580 ℃, the charging and discharging specific capacity is stabilized at 103mAhg -1 And good cycle performance can be continuously maintained after 130 cycles. The cyclic voltammetry test results show that: fePO 4 The sample has a distinct redox peak, and the redox reaction of Fe element is performed stepwise. Its reduction reaction is Fe 3+ Conversion to Fe 2+ The reaction equation is FePO4+ xLi + +xe - →xLiFePO 4 +(1-x)FePO 4 . During the first scan, there was a reduction peak at a position of 2.7V. The corresponding to the reduction peak is an oxidation peak, and the reaction equation is LiFePO4-xLi + -xe - →xFePO 4 +(1-x)LiFePO 4 And the position is at 3.4V. Along with the increase of the cycle number, the reduction peak gradually moves to a high potential, and the oxidation peak gradually moves to a low potential, so that the cycle reversibility of the battery is increased. After the circulation for 2 times, the corresponding voltage and peak current of the material are almost kept unchanged, which indicates that the material has good electrochemical circulation performance.
The iron phosphate lithium ion battery anode material prepared by the invention has simple process operation and is easy to realizeRealizing large-scale industrial production. And the unique open network structure of the glass matrix can relieve FePO (ferric phosphate) 4 The volume change of the anode material in the electrochemical cycle process greatly improves the lithium ion transmission rate in the battery and the cycle stability of the electrode.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. The preparation method of the iron phosphate microcrystalline glass electrode material is characterized by comprising the following steps:
step 1: a certain amount of FePO is added 4 ·2H 2 And (3) drying the O raw material, melting at high temperature to obtain a melt, and then performing water quenching and drying to obtain the mother glass.
And 2, step: and (3) carrying out heat treatment on a certain amount of the mother glass in the step (1) according to the glass transition temperature and the glass crystallization peak temperature in the DTA curve of the mother glass to obtain crystallized glass.
The glass transition temperature and the glass devitrification temperature are the two peaks in the DTA curve.
And step 3: and (3) grinding a certain amount of the devitrified glass obtained in the step (2), mixing the devitrified glass with acetylene black and PVDF, adding a dispersing agent, fully mixing, scraping the mixture on an aluminum foil, and performing vacuum drying to obtain the pole piece.
2. The method for preparing the iron phosphate microcrystalline glass electrode material as claimed in claim 1, wherein in the step 1, fePO is adopted 4 ·2H 2 And drying the O raw material, putting the dried O raw material into an alumina crucible, putting the alumina crucible into a muffle furnace, heating the alumina crucible to 1000-1200 ℃ at the heating rate of 8-10 ℃/min, preserving the heat for 1-2 hours, taking out the O raw material at high temperature by using crucible tongs, directly pouring the O raw material into tap water, and quickly cooling to obtain the water-quenched glass.
3. The method for preparing the iron phosphate microcrystalline glass electrode material according to claim 1, wherein in the step 2, the experimental apparatus for DTA test is an HCT-4 type comprehensive thermal analyzer produced by Beijing Hengjiu laboratory, and according to the DTA test result, the water-quenched and dried glass sample is heated to the glass transition temperature thereof for 1-2 hours at a heating rate of 8-10 ℃/min, then is continuously heated to the first crystallization peak temperature (or 20 ℃ higher than the first crystallization peak temperature of the glass) for heat treatment for 1-2 hours, and is then cooled along with the furnace to obtain crystallized glass.
4. The method for preparing an iron phosphate microcrystalline glass electrode material as claimed in claim 1, wherein in the step 3, the microcrystalline glass powder, the acetylene black and the PVDF are mixed in a mass ratio of (6-8): (3-1): 1, and are ground and mixed in a mortar for 30-60 minutes.
5. The method for preparing the iron phosphate microcrystalline glass electrode material as claimed in claim 1, wherein the dispersant is polyvinylpyrrolidone or a mixed solution of absolute ethyl alcohol and water, the addition amount is about 1-1.5ml, the mixing is carried out in a miniature transparent reagent bottle with magnetons, and the stirring is carried out on a magnetic stirrer for 12-18 hours at a speed which is based on the stirring of the slurry and is not easy to be too fast or too slow.
6. The preparation method of the iron phosphate microcrystalline glass electrode material as claimed in claim 1, wherein the uniformly mixed slurry is applied to an aluminum foil, and a scraper is used to uniformly scrape the sample from head to tail in one time, so that the sample is uniformly laid on the aluminum foil, and the gap height of the scraper is 100-150 μm.
7. The preparation and application of the iron phosphate microcrystalline glass electrode material as claimed in claim 1, wherein the vacuum drying system is as follows: the drying temperature is 80-100 ℃, and the drying time is 12-14 hours.
8. An iron phosphate glass-ceramic electrode material, characterized in that it is prepared by the method of claims 1-7.
9. The application of the iron phosphate glass-ceramic electrode material as claimed in claims 1 to 7, wherein the iron phosphate glass-ceramic electrode material is used as a positive electrode material of a lithium ion battery.
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2022
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