CN112467069A - Battery negative electrode material and preparation method and application thereof - Google Patents

Battery negative electrode material and preparation method and application thereof Download PDF

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Publication number
CN112467069A
CN112467069A CN202011457422.3A CN202011457422A CN112467069A CN 112467069 A CN112467069 A CN 112467069A CN 202011457422 A CN202011457422 A CN 202011457422A CN 112467069 A CN112467069 A CN 112467069A
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mxene
nife
ldh
battery
negative electrode
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张新宇
李晨阳
秦家千
刘日平
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Yanshan University
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Yanshan University
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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
    • H01M4/04—Processes of manufacture in general
    • H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • 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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/523—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron for non-aqueous cells
    • 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
    • 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
    • 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 to the technical field of electrode materials, in particular to a battery cathode material and a preparation method and application thereof. The invention provides a battery anode material, which comprises MXene and NiFe-LDH growing on the surface of the MXene; the ratio of the total mass of Ni and Fe to the mass of MXene in the NiFe-LDH is 1: (0.5-2.5). According to the description of the embodiment, the battery negative electrode material disclosed by the invention has higher specific capacity, better cycling stability and rate capability.

Description

Battery negative electrode material and preparation method and application thereof
Technical Field
The invention relates to the technical field of electrode materials, in particular to a battery cathode material and a preparation method and application thereof.
Background
Energy consumption and environmental pollution are two major problems facing the current society and human, and in the past decade, the total amount of primary energy consumption in China is always on the increase trend, and meanwhile, the consumption of the energy brings a series of environmental pollution and ecological problems. Therefore, it is very important to develop sustainable and clean new energy sources such as solar energy, wind energy, tidal energy, etc. Although renewable energy has been impressively increased and developed over the past 10 years, the energy is unevenly distributed, has low conversion efficiency, is unstable in direct supply, is limited by time and space, and is difficult to popularize and use on a large scale. Therefore, there is an urgent need for new green, efficient, large-scale energy conversion and storage devices. The lithium ion battery as a novel energy storage material has many unique advantages, such as higher voltage, longer service life, environmental friendliness, no memory effect and the like, which makes the lithium ion battery stand out in numerous energy storage technologies and has wide application prospects in electric vehicles and portable electronic equipment. As one of the important components of a lithium ion battery, an electrode material largely affects the performance of the lithium ion battery. Therefore, it is very necessary to design and develop a lithium ion battery negative electrode material having a more stable structure and higher performance and apply it to a lithium ion battery. The theoretical specific capacity of the current commercial graphite negative electrode material is 372mAh/g, and the increasing demand of people cannot be met, so that the development of a negative electrode material with high capacity, long service life and environmental friendliness is very important.
A new transition metal carbide, nitride or carbonitride (MXene) was reported in 2011 by both the professor Gogotsi and the professor barsum of dereisel university, usa. MXene is obtained by selective etching of the A-layer elements in the MAX phase, a type having Mn+1AXnTernary layered carbides, nitrides or carbonitrides of general formula (I), wherein M represents an early transition metal element (such as Ti, Sc, Zr, V, Nb, Cr, Mo, etc.), A represents an IIIA or IVA element, X represents C or N, and N is 1, 2 or 3. With the A elementRemoval of (A), Mn+1XnThe layers retain their layered structural characteristics and the interlaminar forces are significantly reduced, allowing them to be further exfoliated into few or single layers of two-dimensional material. MXene has the unique advantage of having the characteristics of ceramic on the one hand and being chemically and mechanically stable; on the other hand, as the Ti of each crystal lattice has two exposed coordination after etching, and the reaction system is carried out in an aqueous solution containing HF, the removed A element is replaced by F, OH or O, and the A element is adsorbed on the surface of MXene to form a surface functional group, so that the MXene has surface hydrophilicity. In addition, MXene also has the advantages of good conductivity, open structure and the like, is very suitable for preparing electrode materials, and has some challenges in practical application. For example, MXene is liable to self-stacking, resulting in severe decrease in conductivity and specific surface area, while the subject group taught by Gogotisi calculates Ti by DFT3C2MXene has a theoretical capacity of 320mAh/g, but due to the presence of the surface functional groups-OH or-F, Ti3C2MXene had a capacity of only 130 or 67 mAh/g. Therefore, modifying MXene is an effective strategy for developing advanced energy storage materials.
Disclosure of Invention
The invention aims to provide a battery negative electrode material, and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a battery anode material, which comprises MXene and NiFe-LDH growing on the surface of the MXene;
the ratio of the total mass of Ni and Fe to the mass of MXene in the NiFe-LDH is 1: (0.5-2.5).
Preferably, the interlayer anion of the NiFe-LDH is SO4 2-、Cl-、OH-、CO3 2-And NO3 -One or more of them.
The invention also provides a preparation method of the battery cathode material in the technical scheme, which comprises the following steps:
mixing MXene, nickel salt, iron salt, weak base and water, and carrying out hydrothermal reaction to obtain the battery cathode material.
Preferably, the nickel salt is NiSO4·6H2O、NiCl2·6H2O and Ni (NO)3)2·6H2One or more of O;
the iron salt is FeCl3·6H2O and/or Fe (NO)3)3·9H2O。
Preferably, the molar ratio of the nickel salt to the iron salt is (1-5): 1.
preferably, the ratio of the total amount of the nickel salt and iron salt to the amount of the MXene is 1: (0.5-2).
Preferably, the weak base is urea and/or hexamethylenetetramine.
Preferably, the molar ratio of the weak base to MXene is (0.5-5): 1.
preferably, the temperature of the hydrothermal reaction is 100-200 ℃, and the time of the hydrothermal reaction is 6-24 h.
The invention also provides the application of the battery cathode material in the technical scheme or the battery cathode material prepared by the preparation method in the technical scheme in a lithium ion battery.
The invention provides a battery anode material, which comprises MXene and NiFe-LDH growing on the surface of the MXene; the ratio of the total mass of Ni and Fe to the mass of MXene in the NiFe-LDH is 1: (0.5-2.5). The MXene serving as a frame material limits the problem of volume expansion of NiFe-LDH in the charging and discharging processes, and improves the electrochemical cycle stability of the battery cathode material; meanwhile, the NiFe-LDH also avoids the problem of MXene self-stacking, further avoids the problem of poor conductivity of MXene caused by self-stacking, improves the conductivity stability of the battery cathode material, and enables the prepared battery cathode material to have higher specific capacity by utilizing the characteristic of high capacity of the NiFe-LDH. According to the description of the embodiment, the battery negative electrode material disclosed by the invention has higher specific capacity, better cycling stability and rate capability.
Drawings
FIG. 1 is an XRD pattern of the battery anode material of example 1;
FIG. 2 is an SEM image of the negative electrode material of the battery of example 2;
FIG. 3 is a graph of the rate performance of a lithium ion battery prepared using the battery anode material described in example 3 and NiFe-LDH;
FIG. 4 is a graph of the cycling performance of a lithium ion battery prepared using the battery anode material described in example 4, MXene and NiFe-LDH at a current density of 0.1A/g;
FIG. 5 is a graph of the cycling performance at a current density of 1A/g for a lithium ion battery prepared using the battery anode material described in example 5 and NiFe-LDH.
Detailed Description
The invention provides a battery anode material, which comprises MXene and NiFe-LDH growing on the surface of the MXene;
the ratio of the total mass of Ni and Fe to the mass of MXene in the NiFe-LDH is 1: (0.5-2.5).
In the present invention, the interlayer anion of NiFe-LDH is preferably SO4 2-、CO3 2-、OH-、Cl-And NO3 -More preferably CO3 2-Or OH-; when the interlayer anions of the NiFe-LDH are more than two of the specific choices, the specific types of the interlayer anions are not limited in any special way, and the interlayer anions can be mixed according to any mixture ratio.
In the invention, the molar ratio of Ni to Fe in the NiFe-LDH is preferably (1-5): 1, more preferably (2-4): 1. the ratio of the total mass of Ni and Fe to the mass of MXene in the NiFe-LDH is 1: (0.5 to 2.5), more preferably 1: (0.8 to 1.6), most preferably 1: (1.0-1.5).
The invention also provides a preparation method of the battery cathode material in the technical scheme, which comprises the following steps:
mixing MXene, nickel salt, iron salt, weak base and water, and carrying out hydrothermal reaction to obtain the battery cathode material.
In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
The MXene is not limited in kind in the present invention, and those known to those skilled in the art may be used. In the present invention, the MXene species is more preferably Ti3C2MXene. The source of MXene is not limited in any way, and the MXene can be prepared by a preparation method well known to those skilled in the art.
In the present invention, the nickel salt is preferably NiSO4·6H2O、NiCl2·6H2O and Ni (NO)3)2·6H2One or more of O; when the nickel salt is more than two of the specific choices, the proportion of the specific materials is not limited in any way, and the specific materials can be mixed according to any proportion.
In the present invention, the iron salt is preferably FeCl3·6H2O and/or Fe (NO)3)3·9H2O; when the iron salt is FeCl3·6H2O and Fe (NO)3)3·9H2When O, the invention is to the FeCl3·6H2O and Fe (NO)3)3·9H2The proportion of O is not limited in any way, and the O can be mixed according to any proportion.
In the present invention, the weak base is preferably urea and/or hexamethylenetetramine, more preferably urea or hexamethylenetetramine; when the weak base is urea and hexamethylenetetramine, the proportion of the urea and the hexamethylenetetramine is not limited in any special way, and the urea and the hexamethylenetetramine can be mixed according to any proportion. In the present invention, the weak base acts to control the rate of hydrolysis of the metal salt, allowing NiFe-LDH to grow more uniformly on MXene.
The present invention is not limited to any particular kind of water, and those known to those skilled in the art can be used. In the present invention, the water is more preferably deionized water.
In the present invention, the mixing preferably comprises the steps of:
mixing MXene with water to obtain MXene dispersion liquid;
mixing the MXene dispersion, nickel salt, iron salt and weak base.
In the present invention, the mixing of MXene and water is preferably performed under ultrasonic conditions; the ultrasonic treatment time is preferably 20-40 min, more preferably 25-35 min, and most preferably 30 min; the frequency of the ultrasound is not limited in any way, and MXene can be more sufficiently dispersed in water in the ultrasonic range by adopting the frequency known by the person skilled in the art.
In the present invention, the mixing of the MXene dispersion, nickel salt, iron salt and weak base is preferably performed under stirring; the stirring time is preferably 20-40 min, more preferably 25-35 min, and most preferably 30 min; the stirring rate is not particularly limited in the present invention, and the mixture may be uniformly mixed by a process known to those skilled in the art.
In the invention, the molar ratio of the nickel salt to the iron salt is preferably (1-5): 1, more preferably (2-4): 1, most preferably (2.5-3.5): 1; the ratio of the amount of the total substance of the nickel salt and the iron salt to the amount of the substance of the MXene is preferably 1: (0.5 to 2), more preferably 1: (0.8 to 1.6), most preferably 1: (1.0-1.5). In the present invention, since the nickel salt and the iron salt are lost to some extent during the preparation process, the nickel salt and the iron salt are added in a slight excess amount compared to the amount of the total of the Ni and Fe in the product to the amount of the MXene. The molar ratio of MXene to weak base is preferably 1: (0.5 to 5), more preferably 1: (1-2); the volume ratio of MXene substance to water is preferably (0.5-5) mmol/70 mL, more preferably (1-3) mmol:70mL, most preferably (1-1.5) mmol:70 mL.
In the invention, the temperature of the hydrothermal reaction is preferably 100-200 ℃, and more preferably 120-180 ℃; the time of the hydrothermal reaction is preferably 6-24 hours, more preferably 10-20 hours, and most preferably 12-18 hours. In the present invention, the hydrothermal reaction is preferably carried out in a hydrothermal reaction vessel.
After the hydrothermal reaction is finished, the method also preferably comprises the steps of cooling, centrifugal washing by using deionized water and drying which are sequentially carried out. The cooling method is not particularly limited in the present invention, and the product system is cooled to room temperature by a method well known to those skilled in the art. The process of the centrifugal washing is not particularly limited, and may be performed by a process known to those skilled in the art. The drying process of the present invention is not particularly limited, and may be carried out by a method known to those skilled in the art.
The invention also provides the application of the battery cathode material in the technical scheme or the battery cathode material prepared by the preparation method in the technical scheme in a lithium ion battery. The method of the present invention is not particularly limited, and may be carried out by a method known to those skilled in the art.
The following examples are provided to illustrate the negative electrode material of the battery, the preparation method and the application thereof in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
1mmol (0.1676g) of Ti3C2Mixing MXene and 70mL of deionized water for 30min under the ultrasonic condition to obtain Ti3C2MXene dispersion was then stirred with 0.75mmol NiCl2·6H2O、0.25mmol Fe(NO3)3·9H2Mixing and stirring O and 2mmol of urea for 30min, transferring into a hydrothermal reaction kettle, carrying out hydrothermal reaction at 120 ℃ for 18h, cooling to room temperature, carrying out centrifugal washing by using deionized water, and drying to obtain the battery cathode material (Ti)3C2The mol ratio of MXene to NiFe-LDH is 1: 1) (ii) a
The battery negative electrode material is subjected to XRD and SEM tests, the test results are respectively shown in figures 1 and 2, and as can be seen from figure 1, the battery negative electrode material comprises MXene and NiFe-LDH.
Example 2
1.5mmol (0.2514g) of Ti3C2Mixing MXene and 70mL of deionized water for 30min under the ultrasonic condition to obtain Ti3C2MXene dispersion was then stirred with 0.75mmol NiCl2·6H2O、0.25mmol Fe(NO3)3·9H2Mixing and stirring O and 2mmol of urea for 30min, transferring into a hydrothermal reaction kettle, carrying out hydrothermal reaction at 120 ℃ for 18h, cooling to room temperature, carrying out centrifugal washing by using deionized water, and drying to obtain the battery cathode material (Ti)3C2The mol ratio of MXene to NiFe-LDH is 1.5:1) (ii) a
FIG. 2 is an SEM image of the battery anode material, and as can be seen from FIG. 2, the NiFe-LDH is successfully grown on the surface of MXene.
Example 3
1mmol (0.1676g) of Ti3C2Mixing MXene and 70mL of deionized water for 30min under the ultrasonic condition to obtain Ti3C2MXene dispersion was then stirred with 0.8mmol NiCl2·6H2O、0.2mmol Fe(NO3)3·9H2Mixing and stirring O and 2mmol of urea for 30min, transferring into a hydrothermal reaction kettle, carrying out hydrothermal reaction at 120 ℃ for 18h, cooling to room temperature, carrying out centrifugal washing by using deionized water, and drying to obtain the battery cathode material (Ti)3C2The mol ratio of MXene to NiFe-LDH is 1: 1) (ii) a
The cell negative electrode material was subjected to XRD and SEM tests, and the test results were similar to those of examples 1 and 2.
Example 4
1.5mmol (0.2514g) of Ti3C2Mixing MXene and 70mL of deionized water for 30min under the ultrasonic condition to obtain Ti3C2MXene dispersion was then stirred with 0.75mmol NiCl2·6H2O、0.25mmol Fe(NO3)3·9H2Mixing O and 2mmol urea, stirring for 30min, transferring into hydrothermal reaction kettle, performing hydrothermal reaction at 180 deg.C for 18h, cooling to room temperature, and removing ionsCentrifugally washing and drying the water to obtain the battery cathode material (Ti)3C2MXene and NiFe-LDH in a molar ratio of 1.5: 1);
the cell negative electrode material was subjected to XRD and SEM tests, and the test results were similar to those of examples 1 and 2.
Example 5
1mmol (0.1676g) of Ti3C2Mixing MXene and 70mL of deionized water for 30min under the ultrasonic condition to obtain Ti3C2MXene dispersion was then stirred with 0.75mmol NiCl2·6H2O、0.25mmol Fe(NO3)3·9H2Mixing and stirring O and 2mmol of urea for 30min, transferring into a hydrothermal reaction kettle, carrying out hydrothermal reaction at 125 ℃ for 10h, cooling to room temperature, carrying out centrifugal washing by using deionized water, and drying to obtain the battery cathode material (Ti)3C2The mol ratio of MXene to NiFe-LDH is 1: 1) (ii) a
The cell negative electrode material was subjected to XRD and SEM tests, and the test results were similar to those of examples 1 and 2.
Comparative example 1
70mL of deionized water and 0.75mmol of NiCl under stirring2·6H2O、0.25mmol Fe(NO3)3·9H2And mixing and stirring O and 3mmol of urea for 30min, transferring the mixture into a hydrothermal reaction kettle, carrying out hydrothermal reaction for 12h at the temperature of 120 ℃, cooling to room temperature, carrying out centrifugal washing by using deionized water, and drying to obtain the battery cathode material (NiFe-LDH).
Test example
Mixing the battery negative electrode material prepared in examples 1-5, MXene and NiFe-LDH prepared in comparative example 1 with acetylene black and polyvinylidene fluoride (PVDF) respectively according to the mass ratio of 80:10:10, dropwise adding N-methylpyrrolidone (NMP), preparing slurry, coating the slurry on copper foil to serve as a negative electrode of a lithium ion battery, taking a lithium sheet as a positive electrode, and taking LiPF4The solution is used as electrolyte, Celgard-2400 is used as a diaphragm to assemble the lithium ion battery, and the voltage window is 3-0.01V
The battery cathode material prepared in the embodiment 3 and the lithium ion battery prepared from NiFe-LDH are subjected to cycle rate cycling performance tests at 0.1A/g (1-20 cycles), 0.2A/g (21-40 cycles), 0.5A/g (41-60 cycles), 1A/g (61-80 cycles), 1.5A/g (81-100 cycles), 2.0A/g (101-120 cycles) and 0.1A/g (121-160 cycles) in sequence, the test results are shown in figure 3, and it can be known from figure 3 that the first discharge specific capacity of the battery cathode material is 1649.7mAh/g, the capacity retention rate after the cycle is 44.4%, and the specific capacity and the rate cycling performance are both better than that of NiFe-LDH;
the lithium ion battery prepared from the battery negative electrode material in example 4, MXene and NiFe-LDH is subjected to a cycle performance test at 0.1A/g in sequence, and the test result is shown in FIG. 4, and as can be seen from FIG. 4, the first discharge specific capacity of the battery negative electrode material is 1376.4mAh/g, and the capacity retention rate after 160 cycles is 58.8%, which is better than that of MXene and NiFe-LDH;
the sodium ion battery prepared from the battery negative electrode material in example 5 is subjected to cycle performance test at 1A/g in sequence, and the test result is shown in FIG. 5, and as can be seen from FIG. 5, the battery negative electrode material has a capacity retention rate of 34.6% after 500 cycles of cycle under a higher charge-discharge current density, which is much higher than that of NiFe-LDH (0.081%), and also has better cycle stability.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. The battery negative electrode material is characterized by comprising MXene and NiFe-LDH growing on the surface of the MXene;
the ratio of the total mass of Ni and Fe to the mass of MXene in the NiFe-LDH is 1: (0.5-2.5).
2. The battery anode material of claim 1, wherein the interlayer anions of NiFe-LDH areIs SO4 2-、Cl-、OH-、CO3 2-And NO3 -One or more of them.
3. The method for preparing the battery negative electrode material as claimed in claim 1 or 2, characterized by comprising the steps of:
mixing MXene, nickel salt, iron salt, weak base and water, and carrying out hydrothermal reaction to obtain the battery cathode material.
4. The method of claim 3, wherein the nickel salt is NiSO4·6H2O、NiCl2·6H2O and Ni (NO)3)2·6H2One or more of O;
the iron salt is FeCl3·6H2O and/or Fe (NO)3)3·9H2O。
5. The preparation method according to claim 3 or 4, wherein the molar ratio of the nickel salt to the iron salt is (1-5): 1.
6. the method of claim 5, wherein the ratio of the amount of total material of the nickel and iron salts to the amount of material of the MXene is 1: (0.5-2).
7. The process according to claim 2, wherein the weak base is urea and/or hexamethylenetetramine.
8. The preparation method according to claim 2 or 7, wherein the molar ratio of the weak base to MXene is (0.5-5): 1.
9. the method according to claim 2, wherein the hydrothermal reaction is carried out at a temperature of 100 to 200 ℃ for 6 to 24 hours.
10. The battery negative electrode material of claim 1 or 2 or the battery negative electrode material prepared by the preparation method of any one of claims 3 to 9 is applied to a lithium ion battery.
CN202011457422.3A 2020-12-11 2020-12-11 Battery negative electrode material and preparation method and application thereof Pending CN112467069A (en)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN113054187A (en) * 2021-03-19 2021-06-29 东北大学 V-shaped groove2Preparation method of C-MXene/cobalt-nickel double metal hydroxide composite material
CN113371765A (en) * 2021-07-22 2021-09-10 重庆邮电大学 Preparation method of electromagnetic wave-absorbing material based on modification of MXene by NiFe layered double-metal oxide and product thereof

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Application publication date: 20210309