CN116354413A - Preparation method and application of high-entropy oxide negative electrode material of lithium ion battery - Google Patents

Preparation method and application of high-entropy oxide negative electrode material of lithium ion battery Download PDF

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CN116354413A
CN116354413A CN202310236409.2A CN202310236409A CN116354413A CN 116354413 A CN116354413 A CN 116354413A CN 202310236409 A CN202310236409 A CN 202310236409A CN 116354413 A CN116354413 A CN 116354413A
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electrode material
negative electrode
entropy
entropy oxide
lithium ion
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吴狄献
董升阳
任睿祺
尤翔宇
徐子康
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Nanjing University of Information Science and Technology
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    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
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    • H—ELECTRICITY
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    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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Abstract

The invention discloses a preparation method and application of a high-entropy oxide negative electrode material of a lithium ion battery, and belongs to the field of preparation and energy storage application of high-entropy materials. The preparation method comprises the following steps: taking a plurality of different metal oxides as raw materials, wherein the configuration entropy of the raw materials is more than 1.5R; the raw materials are mixed by ball milling and then pressed into a sheet shape to obtain a high-entropy oxide precursor; placing the high-entropy oxide precursor covered treatment plate into a joule heating device for heating, wherein the heating current intensity is 200-230A; the temperature keeps the current intensity to be 180-210A, and the anode material is obtained. Compared with the prior art, the preparation method provided by the invention can greatly shorten the experimental period and remarkably improve the preparation efficiency of the electrode material.

Description

Preparation method and application of high-entropy oxide negative electrode material of lithium ion battery
Technical Field
The invention relates to the field of preparation of high-entropy materials and energy storage application, in particular to a preparation method and application of a lithium ion battery high-entropy oxide negative electrode material.
Background
With the increasing severity of environmental pollution problems, the development of low carbon economy based on low energy consumption, low pollution, low emissions is becoming a worldwide consensus. The diversification of the pushing energy sources, especially the effective utilization of renewable energy sources such as wind energy, solar energy and the like, is getting more attention, but the renewable energy sources are often influenced by various objective conditions which cannot be controlled manually such as seasons, weather, regions and the like, have obvious intermittence and instability, and can bring great impact to a power grid if the renewable energy sources are directly combined into the power grid. Therefore, the popularization of renewable energy power generation technology is promoted, a smart grid including an efficient energy storage technology must be established, and the compatibility and the energy utilization efficiency of renewable energy power generation are improved. In research on energy storage materials, it has been found that the performance of lithium ion batteries in many energy storage materials has reached the peak of conventional energy storage systems. Therefore, the search for new energy storage materials is becoming a current research hotspot, and high-entropy oxide (HEO) is regarded as a potential energy storage material due to the diversity of element compositions, especially high-entropy oxide mostly contains transition metal elements, and the polyvalent state of the transition metal is always a key basis as the energy storage material. High entropy oxides are generally defined as compounds composed of five or more different metal cations and oxygen ions, e.g. (FeCoNiCrMn) 3 O 4 Because the material is early in proposal time and deep in research degree, people develop the superior potential of the material as a lithium storage material. High entropy oxides fall into the category of high entropy materials, and prior to high entropy oxides, scientists have proposed High Entropy Alloys (HEA) and have conducted extensive and intensive research. According to the report by Jiang et al in Science 2021,371,830-834, "high entropy" of high entropy materials refers to this classThe compound has higher configuration entropy delta S conj . According to the gibbs free energy function: an increase in the entropy of the configuration is highly advantageous for the forward progress of the reaction, with Δg=Δh-tΔs, and the lithium storage properties are expected to exceed those of other conventional materials.
At present, the widely applied preparation method of the high-entropy oxide is a traditional high-temperature sintering method, namely high-temperature calcination at about 1100 ℃ for more than 12 hours. For example, meisenheimer et al in Scientific reports 2017,7,13344 report a high entropy oxide preparation method by sintering at 1100℃for 18 hours. However, the conventional high-temperature sintering method has a slow temperature rising rate and a low upper temperature limit due to the limitation of equipment. The slow heating rate leads to longer low-temperature time before the reaction temperature reaches a proper temperature, which leads to a great deal of escape of some light elements such as Li and the like which are easy to escape during heating before the reaction temperature reaches the reaction temperature, greatly reduces the utilization rate of raw materials and indirectly leads to the extension of the experimental period. Meanwhile, the reaction temperature is one of important factors for determining the chemical reaction rate, and the traditional sintering is difficult to reach a very high upper temperature limit, so that the whole sintering reaction needs longer reaction time, which is a direct reason for a longer experimental period. Therefore, how to ensure the excellent electrochemical performance of the material and greatly improve the synthesis efficiency is a problem to be solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method and application of a lithium ion battery high-entropy oxide negative electrode material.
The aim of the invention can be achieved by the following technical scheme:
the preparation method of the high-entropy oxide negative electrode material of the lithium ion battery comprises the following steps:
taking a plurality of different metal oxides as raw materials, wherein the configuration entropy of the raw materials is more than 1.5R;
the raw materials are mixed by ball milling and then pressed into a sheet shape to obtain a high-entropy oxide precursor;
placing the high-entropy oxide precursor covered treatment plate into a joule heating device for heating, wherein the heating current intensity is 200-230A; the temperature keeps the current intensity to be 180-210A, and the anode material is obtained.
Optionally, the metal oxide at least includes: fe (Fe) 2 O 3 、Co 3 O 4 、NiO、Cr 2 O 3 And MnO2.
Optionally, the Fe 2 O 3 、Co 3 O 4 、NiO、Cr 2 O 3 、MnO 2 The molar ratio of (2) is 1:1:1:1:1.
Optionally, the treatment plate is carbon paper.
Alternatively, in the step of pressing into a sheet shape, the pressing pressure is set to 41000N.
Optionally, in the heating process, the heating time is 2-5s; the calcination time is 3-10s.
Optionally, the high entropy oxide precursor is pressed into a round sheet.
Optionally, the ball milling solvent used in the ball milling process is ethanol.
The second aspect of the invention relates to the negative electrode material prepared by the preparation method.
In a third aspect of the invention, a button cell comprises the negative electrode material of claim 9.
The invention adopts CR2032 button battery to assemble lithium battery for testing. 1.0M LiPF using lithium foil as counter and reference electrode 6 Dissolving in a mixed solution of ethylene carbonate/diethyl carbonate (EC/DEC) according to a volume ratio of 1:1 to obtain an electrolyte, taking a porous polyethylene Celgard 2400 film as a diaphragm, mixing an active substance HEO, a conductive agent acetylene black and a binder polyvinylidene fluoride (PVDF) to obtain an active substance slurry, taking a copper foil as a current collector, and assembling the button cell in a glove box filled with argon. And (5) performing electrochemical performance tests such as constant current charge and discharge on the assembled button cell.
The invention has the beneficial effects that:
the invention provides a method capable of rapidly heating (up to 400-500 ℃ s) -1 ) And the heating mode with extremely high upper temperature limit (up to 3000 ℃) is realized in extremely short time (within 15 seconds), namely the Joule heating methodAnd (5) completing sintering preparation of the high-entropy oxide cathode material of the lithium ion battery. The method can greatly shorten the experimental period and remarkably improve the preparation efficiency of the electrode material. Although the rate of rise of joule heating is high and the upper limit of temperature is high, this temperature environment is a very extreme condition for most materials, but for high entropy oxides this extreme temperature change does not have a non-negligible effect on the product structure. This also means that the valence state of the different element components in the product is not affected in the ultra-large temperature range and the ultra-rapid temperature change, and further shows that the preparation method not only improves the synthesis rate of the product by more than 1000 times, but also can keep good electrochemical performance of the product.
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, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is a schematic diagram of (FeCoNiCrMn) 3 O 4 X-ray diffraction curve of (2).
FIG. 2 is a diagram (FeCoNiCrMn) 3 O 4 As a constant-current charge-discharge curve when the lithium ion battery cathode material is used, the discharge specific capacity of the first circle reaches 805mAh g -1 In the subsequent charge and discharge process, the reversible specific capacity is 463mAh g -1 Left and right. This shows that the electrochemical performance of the product is not adversely affected under extremely high temperature conditions, and the lithium storage performance of the product is ensured.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
This example discloses a kind of (FeCoNiCrMn) 3 O 4 The preparation method of the high-entropy oxide can comprise the following steps:
step one: selection of Fe 2 O 3 、Co 3 O 4 、NiO、Cr 2 O 3 、MnO 2 Wherein five metal oxides with the molar ratio of metal elements of 1:1:1:1 are used as raw materials;
step two: placing the five metal oxide powders weighed in the first step into a planetary ball mill for ball milling for 2 hours, wherein the rotating speed is 300r/min;
step three: placing the ball-milled mixture into a vacuum drying oven after ball milling is finished, and vacuum drying the ball-milled mixture for 12 hours at 80 ℃;
step four: grinding after the raw materials are completely dried, thus obtaining mixed powder of five metal oxides;
step five: dividing the powder prepared in the powder step four into a plurality of parts by taking 0.5g as a unit, and pressing each part in a tablet press to obtain a thin wafer with the thickness of about 1mm, namely a high-entropy oxide precursor;
step six: transferring the high-entropy oxide precursor pressed in the fifth step to cut proper carbon paper, and covering a piece of carbon paper with the same size and specification above the high-entropy oxide precursor to finish sample preparation work before reaction sintering;
step seven: placing the sample prepared in the step six in a joule heating furnace, screwing a fixing screw, heating to 2400 ℃, wherein the heating time is 3s, and the temperature keeping time is 4s;
step eight: and D, taking out the product prepared in the step seven from the furnace when the temperature is reduced to room temperature, namely the target product.
Wherein, the ratio of the amounts of the metal element substances of the five proper amounts of the metal oxides in the first step is 1:1:1:1:1; the ball milling solvent in the second step is ethanol; the pressure of the tablet press in the fifth step was 41000N.
Example 2
This example discloses that the catalyst prepared in example 1 (FeCoNiCrMn) 3 O 4 A method of assembling a button cell of high entropy oxide may comprise the steps of:
step one: the mass prepared in example 1 (FeCoNiCrMn) was weighed out 3 O 4 Acetylene black and PVDF;
step two: uniformly mixing the three samples weighed in the first step in a mortar, and grinding the three samples to be pasty by taking N-methyl pyrrolidone as a solvent;
step three: cutting copper foil into copper sheets with the diameter of 10mm to be used as a current collector of the button cell;
step four: uniformly coating the sizing agent prepared in the second step on the copper sheet cut in the third step;
step five: fully drying the copper sheet coated with the active material slurry in the fourth step;
step six: transferring the dried sample and the CR2032 type button cell assembly prepared in the fifth step into a glove box filled with argon gas to assemble the button cell;
step seven: 1.0M LiPF with lithium foil as counter and reference electrode 6 Dissolving in a mixture of ethylene carbonate and diethyl carbonate (EC/DEC) according to a volume ratio of 1:1 to serve as an electrolyte, taking a porous polypropylene Celgard 2400 membrane as a diaphragm, and taking the sample prepared in the step five as a battery working electrode to assemble a battery;
step eight: when the battery is assembled, the battery components from bottom to top are as follows: the battery positive electrode shell, the working electrode, the diaphragm, the counter electrode, the gasket, the spring piece and the battery negative electrode shell;
step nine: and placing the assembled button cell in a button cell sealing tablet press to seal the button cell, and finally placing the button cell in a corresponding electrochemical testing instrument to test the electrochemical performance.
Wherein the mass ratio of the active substance, the acetylene black and the PVDF in the first step is 7:2:1; drying at 80 ℃ for 12 hours under the vacuum state as the drying condition in the fifth step; in the seventh step, when the button cell is assembled, the electrolyte is fully infiltrated into the diaphragm and the whole button cell to ensure the movement of lithium ions; step nine pressure of sealing tablet press50kg cm -2 。
Example 3
This example discloses a kind of (FeCoNiCrMn) 3 O 4 The preparation method of the high-entropy oxide can comprise the following steps:
step one: selection of Fe 2 O 3 、Co 3 O 4 、Cr 2 O 3 、MnO 2 NiO, wherein five metal oxides with a metal element molar ratio of 1:1:1:1 are used as raw materials;
step two: placing the five metal oxide powders weighed in the first step into a planetary ball mill for ball milling for 2 hours, wherein the rotating speed is 300r/min;
step three: placing the ball-milled mixture into a vacuum drying oven after ball milling is finished, and vacuum drying the ball-milled mixture for 12 hours at 80 ℃;
step four: grinding after the raw materials are completely dried, thus obtaining mixed powder of five metal oxides;
step five: dividing the powder prepared in the powder step four into a plurality of parts by taking 0.5g as a unit, and pressing each part in a tablet press to obtain a thin wafer with the thickness of about 1mm, namely a high-entropy oxide precursor;
step six: transferring the high-entropy oxide precursor pressed in the fifth step to cut proper carbon paper, and covering a piece of carbon paper with the same size and specification above the high-entropy oxide precursor to finish sample preparation work before reaction sintering;
step seven: placing the sample prepared in the step six in a joule heating furnace, screwing a fixing screw, heating to 2300 ℃, wherein the heating time is 3s, and the temperature keeping time is 10s;
step eight: and D, taking out the product prepared in the step seven from the furnace when the temperature is reduced to room temperature, namely the target product.
Wherein, the ratio of the amounts of the metal element substances of the five proper amounts of the metal oxides in the first step is 1:1:1:1:1; the ball milling solvent in the second step is ethanol; the pressure of the tablet press in the fifth step was 41000N.
Example 4
This example discloses a kind of (FeCoNiCrMn) 3 O 4 The preparation method of the high-entropy oxide can comprise the following steps:
step one: selection of Fe 2 O 3 、Co 3 O 4 、Cr 2 O 3 、MnO 2 NiO, wherein five metal oxides with a metal element molar ratio of 1:1:1:1 are used as raw materials;
step two: placing the five metal oxide powders weighed in the first step into a planetary ball mill for ball milling for 2 hours, wherein the rotating speed is 300r/min;
step three: placing the ball-milled mixture into a vacuum drying oven after ball milling is finished, and vacuum drying the ball-milled mixture for 12 hours at 80 ℃;
step four: grinding the raw materials after the raw materials are completely dried, so as to obtain mixed powder of five metal oxides;
step five: dividing the powder prepared in the powder step four into a plurality of parts by taking 0.3g as a unit, and pressing each part in a tablet press to obtain a thin wafer with the thickness of about 1mm, namely a high-entropy oxide precursor;
step six: transferring the high-entropy oxide precursor pressed in the fifth step to cut proper carbon paper, and covering a piece of carbon paper with the same size and specification above the high-entropy oxide precursor to finish sample preparation work before reaction sintering;
step seven: placing the sample prepared in the step six in a joule heating furnace, screwing a fixing screw, heating to 2450 ℃, wherein the heating time is 4s, and the temperature keeping time is 3s;
step eight: and D, taking out the product prepared in the step seven from the furnace when the temperature is reduced to room temperature, namely the target product.
Wherein, the ratio of the amounts of the metal element substances of the five proper amounts of the metal oxides in the first step is 1:1:1:1:1; the ball milling solvent in the second step is ethanol; the pressure of the tablet press in the fifth step was 41000N.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.

Claims (10)

1. The preparation method of the high-entropy oxide negative electrode material of the lithium ion battery is characterized by comprising the following steps of:
taking a plurality of different metal oxides as raw materials, wherein the configuration entropy of the raw materials is more than 1.5R;
the raw materials are mixed by ball milling and then pressed into a sheet shape to obtain a high-entropy oxide precursor;
placing the high-entropy oxide precursor covered treatment plate into a joule heating device for heating, wherein the heating current intensity is 200-230A; the temperature keeps the current intensity to be 180-210A, and the anode material is obtained.
2. The method for preparing a high-entropy oxide negative electrode material for a lithium ion battery according to claim 1, wherein the metal oxide at least comprises: fe (Fe) 2 O 3 、Co 3 O 4 、NiO、Cr 2 O 3 With MnO 2 。
3. The method for preparing a lithium ion battery high entropy oxide negative electrode material according to claim 2, wherein the Fe 2 O 3 、Co 3 O 4 、NiO、Cr 2 O 3 、MnO 2 The molar ratio of (2) is 1:1:1:1:1.
4. The method for preparing a high-entropy oxide negative electrode material for a lithium ion battery according to claim 1, wherein the treatment plate is carbon paper.
5. The method for producing a high-entropy oxide negative electrode material for a lithium ion battery according to claim 1, wherein in the step of pressing into a sheet, the pressing pressure is set to 41000N.
6. The method for preparing the high-entropy oxide negative electrode material of the lithium ion battery according to claim 1, wherein the heating time is 2-5s in the heating process; the calcination time is 3-10s.
7. The method for preparing a lithium ion battery high entropy oxide negative electrode material according to claim 1, wherein the high entropy oxide precursor is pressed into a round sheet shape.
8. The method for preparing a high-entropy oxide negative electrode material of a lithium ion battery according to claim 1, wherein the ball milling solvent used in the ball milling process is ethanol.
9. A negative electrode material produced by the production method according to any one of claims 1 to 8.
10. A button cell comprising the negative electrode material of claim 9.
CN202310236409.2A 2023-03-13 2023-03-13 Preparation method and application of high-entropy oxide negative electrode material of lithium ion battery Pending CN116354413A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110190259A (en) * 2019-06-12 2019-08-30 四川大学 A kind of preparation method and lithium ion battery negative material of the high entropy oxide of nanometer
CN110364717A (en) * 2019-07-24 2019-10-22 东北大学秦皇岛分校 A kind of high entropy oxide electrode material of spinel-type and preparation method thereof
CN112537804A (en) * 2020-12-07 2021-03-23 东北大学秦皇岛分校 Lithium-doped high-entropy oxide battery negative electrode material and preparation and application methods thereof
CN112599749A (en) * 2020-12-18 2021-04-02 安徽工业大学 High-entropy oxide lithium ion battery cathode material with high conductivity and preparation method thereof
CN113636607A (en) * 2021-08-03 2021-11-12 中国矿业大学 Preparation method of high-entropy oxide of lithium ion battery negative electrode material
CN115093214A (en) * 2022-07-21 2022-09-23 南京信息工程大学 Ultrafast preparation method of high-entropy oxide

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110190259A (en) * 2019-06-12 2019-08-30 四川大学 A kind of preparation method and lithium ion battery negative material of the high entropy oxide of nanometer
CN110364717A (en) * 2019-07-24 2019-10-22 东北大学秦皇岛分校 A kind of high entropy oxide electrode material of spinel-type and preparation method thereof
CN112537804A (en) * 2020-12-07 2021-03-23 东北大学秦皇岛分校 Lithium-doped high-entropy oxide battery negative electrode material and preparation and application methods thereof
CN112599749A (en) * 2020-12-18 2021-04-02 安徽工业大学 High-entropy oxide lithium ion battery cathode material with high conductivity and preparation method thereof
CN113636607A (en) * 2021-08-03 2021-11-12 中国矿业大学 Preparation method of high-entropy oxide of lithium ion battery negative electrode material
CN115093214A (en) * 2022-07-21 2022-09-23 南京信息工程大学 Ultrafast preparation method of high-entropy oxide

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