CN113104899B - K 2 Fe 2 (MoO 4 ) 3 Application in lithium ion battery cathode - Google Patents

K 2 Fe 2 (MoO 4 ) 3 Application in lithium ion battery cathode Download PDF

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CN113104899B
CN113104899B CN202010969973.1A CN202010969973A CN113104899B CN 113104899 B CN113104899 B CN 113104899B CN 202010969973 A CN202010969973 A CN 202010969973A CN 113104899 B CN113104899 B CN 113104899B
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containing compound
room temperature
lithium ion
ion battery
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CN113104899A (en
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冯凯
葛秀丽
刘珊珊
王福香
杨昕
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Yantai University
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/009—Compounds containing, besides iron, two or more other elements, with the exception of oxygen or hydrogen
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/01—Particle morphology depicted by an image
    • C01P2004/03—Particle morphology depicted by an image obtained by SEM
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/40—Electric properties
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • 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 relates toK 2 Fe 2 (MoO 4 ) 3 The lithium ion battery cathode is applied to the lithium ion battery cathode. Said K is 2 Fe 2 (MoO 4 ) 3 The compound is used as an active material applied to the lithium ion battery cathode, has better charge and discharge performance of the lithium ion battery, good cycle stability and proper working voltage, and can be used as the lithium ion battery cathode material.

Description

K 2 Fe 2 (MoO 4 ) 3 Application in lithium ion battery cathode
Technical Field
The invention relates to a compound of formula K 2 Fe 2 (MoO 4 ) 3 The lithium ion battery cathode material, the preparation method and the lithium ion battery manufactured by the material.
Background
With the increasing severity of energy problems, the increasing scarcity of non-renewable resources, and the increasing awareness of people on the importance of environmental protection, the social demand for new energy is increasing, and stored energy plays an increasingly important role in energy systems. Previously, lithium ion batteries, which are important energy storage devices in new energy, have attracted a lot of research resources.
The negative electrode materials currently applied to lithium ion batteries mainly comprise graphite, carbon, lithium titanate and the like. However, these materials still suffer from a number of problems: poor specific capacity, poor cycling stability, difficulty in preparation and the like, which severely limits the practical application of these materials. Therefore, the search for new lithium ion battery negative electrode materials remains a hotspot and difficulty of lithium ion battery research. Among polyanionic negative electrode materials, molybdate has gained more and more attention due to its higher specific capacity.
Disclosure of Invention
In view of the above-mentioned technical problems, the present invention aims to provide a K 2 Fe 2 (MoO 4 ) 3 The material is used as a negative electrode material in a lithium ion battery;
the specific technical scheme is as follows:
k 2 Fe 2 (MoO 4 ) 3 Application in the negative electrode of a lithium ion battery, K 2 Fe 2 (MoO 4 ) 3 The compound is used as an active material to be applied to a lithium ion battery cathode.
The describedThe lithium ion battery cathode active material is K 2 Fe 2 (MoO 4 ) 3 A material.
K provided by the invention 2 Fe 2 (MoO 4 ) 3 A lithium ion battery cathode material.
Preparation of K by solid-phase reaction 2 Fe 2 (MoO 4 ) 3 The method comprises the following steps:
1) Preparing materials: mixing and pretreating a K-containing compound, an Fe-containing compound and a Mo-containing compound according to the molar ratio of K: fe: mo (2-2.1): 2;
the pretreatment is to uniformly mix the prepared raw materials, pour the mixture into a crucible, heat the mixture for 2 to 10 hours in a muffle furnace from room temperature to 200 to 500 ℃, and then cool the mixture to room temperature;
2) Controlling various parameters to synthesize materials: placing the crucible containing the ingredients in a muffle furnace; raising the temperature from room temperature to 600-1000 ℃ at the rate of 1-10 ℃; preserving the heat for 10-40 hours; after the reaction is fully carried out, the temperature is reduced to room temperature at the speed of 1-50 ℃/h to obtain K 2 Fe 2 (MoO 4 ) 3 A material;
the K-containing compound is one or more than two of K oxide, K carbonate, K borate, K nitrate or K oxalate;
the Fe-containing compound is one or more than two of Fe oxide and Fe oxalate;
the Mo-containing compound is MoO 2 Or MoO 3 One or two of them.
Preparation of K by sol-gel method 2 Fe 2 (MoO 4 ) 3 The lithium ion battery negative electrode material comprises the following steps:
1) Preparing materials: mixing a K-containing compound, a divalent Fe-containing compound and a Mo-containing compound according to the weight ratio of K: fe: mo: adding oxalic acid (2-2.1) to 2; the molar concentration of the K-containing compound in deionized water is 0.1-0.5mol/L.
2) Transferring the sol to a drying oven at 100-150 ℃, drying to gel, grinding the gel into powder, transferring the powder to a porcelain boat, and performing pretreatment;
the pretreatment is that the raw materials in the porcelain boat are heated from room temperature to 200-500 ℃ in a muffle furnace for more than 2-10 hours, and then cooled to room temperature;
3) Controlling various parameters to synthesize the material: placing the porcelain boat containing the ingredients in a muffle furnace; raising the temperature to 600-1000 ℃ at the rate of 1-10 ℃; preserving the heat for 10-40 hours; after the reaction is fully carried out, the temperature is reduced to room temperature at the speed of 1-50 ℃/h to obtain K 2 Fe 2 (MoO 4 ) 3 A material;
the K-containing compound is one or more than two of K oxide, K carbonate, K borate, K nitrate or K oxalate;
the Fe-containing compound is one or more than two of Fe oxide and Fe oxalate;
the Mo-containing compound is MoO 2 Or MoO 3 One or two of them.
A few typical obtainable Ks are listed below 2 Fe 2 (MoO 4 ) 3 Chemical reaction formula of the compound:
(1) K 2 CO 3 +2FeO+3MoO 3 =K 2 Fe 2 (MoO 4 ) 3 +CO 2
(2) 4KNO 3 +4FeO+6MoO 3 ＝2K 2 Fe 2 (MoO 4 ) 3 +4NO 2 +O 2
(3) K 2 CO 3 +2FeC 2 O 4 +3MoO 3 ＝2K 2 Fe 2 (MoO 4 ) 3 +3CO 2 +2CO
the invention has the advantages that: obtained K 2 Fe 2 (MoO 4 ) 3 The negative electrode material has high specific capacity, rate capability and cycling stability. K 2 Fe 2 (MoO 4 ) 3 The lithium ion battery cathode material has higher specific capacity reaching 800mAh/g; the working voltage is between 0.05 and 3.0V, and the specific capacity can still be kept above 90 percent after 100 cycles.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 shows the invention K 2 Fe 2 (MoO 4 ) 3 SEM pictures of lithium ion battery negative electrode materials.
FIG. 2 shows the invention K 2 Fe 2 (MoO 4 ) 3 The polycrystalline powder X-ray diffraction pattern of (a).
FIG. 3 shows the invention K 2 Fe 2 (MoO 4 ) 3 Crystal structure of lithium.
FIG. 4 shows the invention K 2 Fe 2 (MoO 4 ) 3 0.1C multiplying power of the lithium negative electrode material and a charge-discharge curve of 0.05-3.0V.
FIG. 5 shows the invention K 2 Fe 2 (MoO 4 ) 3 Rate performance curve of lithium negative electrode material.
Detailed Description
The present invention will now be described in more detail with reference to the appended drawings, in which preferred embodiments of the invention are shown, it being understood that one skilled in the art can modify the invention herein described while still achieving the beneficial results of the present invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
Example 1K 2 Fe 2 (MoO 4 ) 3 High temperature solid phase preparation of negative electrode materials
0.01mol of K 2 CO 3 0.02mol of FeO and 0.03mol of MoO 3 Put in the horseIn an agate mortar, grind for half an hour. Transferred to a crucible and placed in a muffle furnace. The furnace is heated to 300 ℃ at the heating rate of 5 ℃/min, the temperature is kept for 5 hours, and finally the temperature is reduced to the room temperature at the speed of 20 ℃/min. And taking out the synthesized material, grinding the synthesized material into powder, transferring the powder into the crucible again, and putting the crucible into a muffle furnace. The furnace is heated to 800 ℃ at the heating rate of 5 ℃/min, the temperature is preserved for 20 hours, and finally the temperature is reduced to the room temperature at the speed of 20 ℃/min. Taking out the obtained product and grinding the obtained product to obtain K 2 Fe 2 (MoO 4 ) 3 A compound is provided.
As shown in FIG. 1, it is a gray green powder having a tap density of 2.0g/cm 3 Melting point 840 ℃. The X-ray diffraction spectrum is shown in figure 2, and the crystal structure diagram is shown in figure 3. As can be seen from FIG. 3, the basic structural unit is CrO 6 And MoO 4 Polyhedral of MoO 4 The polyhedrons are connected to form a three-dimensional network structure.
Example 2K 2 Fe 2 (MoO 4 ) 3 Sol-gel preparation of negative electrode materials
0.03mol of oxalic acid was dissolved in a beaker containing 100ml of deionized water, and then 0.02mol of Fe (NO) was added 3 ) 2 Stirring in constant temperature water bath at 70-80 deg.C until it is light green solution, and adding 0.03mol of MoO 3 0.01mol of K 2 CO 3 And continuously stirring to form green sol. And (3) placing the sol in an oven at 80 ℃ for drying for about 10 hours to obtain a green fluffy precursor, grinding the precursor into powder, placing the powder in a crucible, and placing the crucible in a muffle furnace. The furnace is heated to 300 ℃ at the heating rate of 5 ℃/min, the temperature is kept for 5 hours, and finally the temperature is reduced to the room temperature at the speed of 20 ℃/min. And taking out the synthesized material, grinding the synthesized material into powder, transferring the powder into the crucible again, and putting the crucible into a muffle furnace. The furnace is heated to 800 ℃ at the heating rate of 5 ℃/min, the temperature is kept for 20 hours, and finally the temperature is reduced to the room temperature at the speed of 20 ℃/min. Taking out the obtained product and grinding the obtained product to obtain K 2 Fe 2 (MoO 4 ) 3 A compound is provided.
The materials obtained in the examples 1 and 2 are dissolved in a solvent according to the mass ratio of 8The amount of N-methylpyrrolidone was mixed uniformly, an electrode film having a thickness of 0.15mm was coated by a wet film maker, an electrode sheet having a diameter of 12mm was cut by a microtome after vacuum drying, and the mass of the active material was weighed and calculated. Meanwhile, a lithium sheet is used as a negative electrode, celgard 2500 is used as a diaphragm, and 1mol/L LiPF 6 The EC + DMC (volume ratio 1. The assembled cells were then subjected to electrochemical testing, each at a constant current of 0.05-3V. The results of the tests are shown in FIGS. 4 and 5, where K can be seen 2 Fe 2 (MoO 4 ) 3 Has high specific discharge capacity up to 800mAhg -1 Has good rate-circulating performance, and still has 450mAhg at 20-rate -1 The specific capacity of (A).
Figure 910881DEST_PATH_IMAGE002
Said K 2 Fe 2 (MoO 4 ) 3 The compound is used as an active material applied to the lithium ion battery cathode, has better charge and discharge performance of the lithium ion battery, good cycle stability and proper working voltage, and can be used as the lithium ion battery cathode material.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (2)

1. K 2 Fe 2 (MoO 4 ) 3 The application in the negative electrode of the lithium ion battery is characterized in that: said K 2 Fe 2 (MoO 4 ) 3 The compound is used as an active material to be applied to a lithium ion battery cathode;
and, said K 2 Fe 2 (MoO 4 ) 3 The preparation of the compounds is as follows:
preparation of K by solid-phase reaction 2 Fe 2 (MoO 4 ) 3 A compound comprising the steps of:
1) Preparing materials: mixing and pretreating a K-containing compound, an Fe-containing compound and a Mo-containing compound according to a molar ratio of K: fe: mo being 2-2.1;
the pretreatment is that the prepared raw materials are uniformly mixed, heated from room temperature to 200-500 ℃ for 2-10 hours, and then cooled to room temperature;
2) Controlling various parameters to synthesize the material: raising the temperature of the pretreated ingredients from room temperature to 600-1000 ℃ at the speed of 1-10 ℃/min; preserving the heat for 10-40 hours; after the reaction is fully carried out, the temperature is reduced to room temperature at the speed of 1-50 ℃/h to obtain K 2 Fe 2 (MoO 4 ) 3 A material;
the K-containing compound is one or more than two of K oxide, K carbonate, K borate, K nitrate or K oxalate;
the Fe-containing compound is one or more than two of Fe oxide and Fe oxalate;
the Mo-containing compound is MoO 2 Or MoO 3 One or two of them;
alternatively, K is prepared by a sol-gel method 2 Fe 2 (MoO 4 ) 3 A compound comprising the steps of:
1) Preparing materials: mixing a K-containing compound, a divalent Fe-containing compound, a Mo-containing compound and oxalic acid according to the weight ratio of K: fe: mo: adding oxalic acid into deionized water at 50-100 ℃ according to a molar ratio of 2-2.1;
2) Drying the sol at 100-200 ℃ to obtain gel, grinding the gel into powder, and then carrying out pretreatment;
the pretreatment is to heat the mixture from room temperature to 200-500 ℃ for more than 2-10 hours, and then cool the mixture to room temperature;
3) Controlling various parameters to synthesize the material: pretreating the material obtained in the step 2); raising the temperature to 600-1000 ℃ at the speed of 1-10 ℃/min; preserving the heat for 10-40 hours; after the reaction is fully carried out, the temperature is reduced to room temperature at the speed of 1-50 ℃/h to obtain K 2 Fe 2 (MoO 4 ) 3 A material;
the K-containing compound is one or more than two of K oxide, K carbonate, K borate, K nitrate or K oxalate;
the divalent Fe-containing compound is one or more than two of Fe oxide and Fe oxalate;
the Mo-containing compound is MoO 2 Or MoO 3 One or two of them.
2. Use according to claim 1, characterized in that:
preparation of K by sol-gel method 2 Fe 2 (MoO 4 ) 3 The molar concentration of the K-containing compound in the deionized water in the step 1) of the compound is 0.1-0.5mol/L.
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