阅读说明：本技术 迈科烯及其制备方法、锂离子电池、应用 (Mike alkene, preparation method thereof, lithium ion battery and application ) 是由 申淼 赵素芳 蒋伟言 汤睿 王建强 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种迈科烯及其制备方法、锂离子电池、应用。其中的迈科烯的制备方法包括以下步骤：以MAX相作为阳极电解即可制得迈科烯；电解在熔盐中进行；熔盐中的氧含量为100-2000ppm；熔盐中的氧含量通过电解纯化控制,电解纯化的时间为2～24h；熔盐为含有LiCl、NaCl和KCl中的任意两种或三种的氯化物熔盐。采用本发明的方法制备得到了无氟的迈科烯,该迈科烯在作为锂离子电池的电极材料后,在多次充放电循环中,仍能保持较好的稳定性。(The invention discloses a michael alkene, a preparation method thereof, a lithium ion battery and application. The preparation method of the mecamirene comprises the following steps: electrolyzing by taking MAX phase as anode to obtain Mike alkene; the electrolysis is carried out in molten salt; the oxygen content in the molten salt is 100-2000 ppm; controlling the oxygen content in the molten salt through electrolytic purification, wherein the electrolytic purification time is 2-24 h; the molten salt is chloride molten salt containing any two or three of LiCl, NaCl and KCl. The fluorine-free michael prepared by the method can still keep better stability in multiple charge-discharge cycles after being used as an electrode material of a lithium ion battery.)

1. The preparation method of mecamirene is characterized by comprising the following steps: electrolyzing MAX phase as anode in molten salt to obtain Mike alkene;

the oxygen content in the molten salt is 100-2000 ppm;

controlling the oxygen content in the molten salt through electrolytic purification, wherein the electrolytic purification time is 2-24 h;

the molten salt is chloride molten salt containing any two or three of LiCl, NaCl and KCl.

2. The process for the preparation of meckene according to claim 1, wherein the MAX phase is titanium aluminum carbide or titanium silicon carbide;

and/or the MAX phase is MAX phase powder; the MAX phase powder has a particle size of preferably 1 to 200 μm, more preferably 10 to 80 μm, for example 74 μm;

and/or the amount of the MAX phase is 1-10 g, preferably 2-7 g;

and/or the manufacturing method of the anode in the electrolysis process comprises the following steps: pressing and fixing the MAX; preferably, after the MAX phase is pressed, the MAX phase is directly fixed without being wrapped by nickel foam;

and/or the molten salt is LiCl-NaCl-KCl molten salt or LiCl-KCl molten salt.

3. The process for the preparation of meckene according to claim 2, characterized in that the pressing is carried out in a mould;

and/or, after said pressing, the MAX phase is in the form of flakes of (5-40 mm) × (5-30 mm) × (0.5-5 mm), for example 10mm × 30mm × 1mm or 10mm × 30mm × 3.5 mm;

and/or the pressure adopted during pressing is 10-45 MPa, such as 25MPa or 35 MPa;

and/or, the fixing operation is: fixing the pressed MAX phase to a conductive rod, preferably a metal rod or a graphite rod; the diameter of the conductive rod is 2-4 mm, such as 3 mm; the metal bar is preferably a copper bar.

4. The process for the preparation of meckene according to claim 1, characterized in that the electrolysis is carried out in an electrolytic cell; the size of the electrolytic cell is preferably a cylinder with an inner diameter of 40-100mm, a height of 50-200mm and a wall thickness of 0.5-5mm, such as an inner diameter of 80mm, a height of 100mm and a wall thickness of 5 mm;

and/or the material of the electrolytic cell is corundum, graphite or quartz, such as corundum;

and/or the molten salt has a mass of 20 to 2000g, for example 30 g.

5. The process for the preparation of meckene according to claim 1, wherein the electrolytic purification is carried out before the electrolysis, for example, the electrolytic purification is carried out with a stainless steel rod as cathode and a graphite rod as anode before the electrolysis;

and/or the atmosphere in the molten salt is a high-purity argon atmosphere of 99.999%;

and/or the voltage of the electrolytic purification is 1-5V, preferably 2.8-5V, and more preferably 3-5V;

and/or the time for electrolytic purification is 3-12 h, preferably 4-12 h, more preferably 6-12 h;

and/or, before the electrolytic purification, heating the molten salt to be molten and preserving heat;

and/or the oxygen content in the molten salt is 100-2000ppm, such as 253ppm, 283ppm or 1566 ppm;

and/or the electrolytic cathode material is a high-temperature-resistant conductive material, such as a metal material or a graphite material;

and/or the electrolytic cathode material is a rod-shaped material with the diameter of 12-16 mm, such as a rod-shaped material with the diameter of 15 mm;

and/or the voltage of the electrolysis is 1-5V, preferably 2-5V, such as 2.4V or 2.5V;

and/or the electrolysis time is 4-20 h, preferably 8-20 h, such as 12 h;

preferably, the voltage of the electrolysis is 2-5V, and the time of the electrolysis is 8-20 h;

preferably, the voltage of the electrolysis is 2V, and the time of the electrolysis is 8 h;

preferably, the voltage of the electrolysis is 2.4V, and the time of the electrolysis is 12 h.

6. The process for the preparation of meckene according to claim 5, wherein the heating is carried out at a temperature of 300 to 750 ℃, preferably 400 to 650 ℃, such as 430 ℃ or 500 ℃;

and/or the heat preservation time is 2-10 h, such as 5 h.

7. The process for the preparation of meckene according to claim 1, characterized in that it further comprises the following separation steps: dissolving the fused salt containing the mecamirene and separating;

preferably, before the dissolution, the fused salt containing the michael is cooled;

preferably, the solvent used for dissolving is deionized water or dilute hydrochloric acid, such as deionized water;

preferably, the dissolving comprises a process of soaking and rinsing; the soaking time is preferably 1-10 min, such as 5 min; the number of the rinsing is preferably 1 to 30 times, for example 5 times; the solvent amount used in the washing is preferably 5-2000 mL/time, for example 50 mL/time;

preferably, the dissolution is accelerated by an ultrasonic machine; the time of the ultrasound is preferably 1 minute;

preferably, the separation process further comprises a drying process; the drying method is preferably a hot air oven or a vacuum oven; the drying temperature is preferably 50-100 ℃, for example 80 ℃; the drying time is preferably 0.5 to 12 hours.

8. A michaene prepared by the process for the preparation of michaene as claimed in any one of claims 1 to 7.

9. Use of a meckene according to claim 8 in a lithium ion battery.

10. A lithium ion battery, characterized in that the electrode material of the lithium ion battery comprises the michael as claimed in claim 8.

Technical Field

The invention relates to michael, a preparation method thereof, a lithium ion battery and application.

Background

The Mike alkene (MXene) has high specific surface area and good electronic conductivity, and has great application potential in the field of energy. In recent years, the preparation of michael materials using MAX phase materials as precursors has received much attention from material researchers. The MAX phase material is a material having the general formula M_n+1AX_nWherein M is a transition group metal element, A is a main group element, X is carbon or nitrogen, n is 1, 2 or 3, and the crystal structure of the carbide is formed by M_n+1X_nThe sheets and the A atomic layers are alternately stacked. By utilizing the characteristics of MAX phase structure, the layer A can be removed independently to prepare Mekkene M_n+1X_nT_x. Where T represents a surface termination functional group, often T represents different elements depending on the etching method, such as: t ═ O, F, OH. The structural difference between MXene and MAX phases can generally be judged by XRD, namely: after the A layer elements are etched, the interlayer spacing is increased, and the diffraction peak of the MAX phase of the raw material at about 10 degrees can shift to a small angle, and generally can shift to<10 degrees; and the common micro-nano porous multilayer carbon-based material has no diffraction peak in the interval.

Chinese patent document CN 109768257a discloses an aqueous phase method for preparing titanium carbide michaelis, which removes main group element a by room temperature aqueous phase hydrofluoric acid etching method, the time consumption is long, the etchant used in the preparation process is toxic hydrofluoric acid, and the michaelis prepared has fluorine functional group.

Chinese patent document CN 107177857 discloses a method for preparing a micro-nano porous multilayer carbon-based material. Firstly, pressing and molding oxide powder, wrapping the oxide powder with foamed nickel, and performing first electrolysis in molten salt as a cathode to obtain metal carbide; and then taking the metal carbide as an anode to continue to carry out second electrolysis, so that metal elements are sequentially separated from the electrode, and finally cleaning to obtain the porous chromium carbide or porous carbon material. Wherein, regarding the control aspect of the oxygen content: the patent literature selects anhydrous CaCl₂Molten salt as electrolyte and uses high purity99.999% argon is used as atmosphere, the oxygen content of the molten salt is controlled consciously, but a leak for introducing oxygen element exists: 1) in the first electrolysis process, metal elements gradually form compounds with carbon elements, oxygen elements in metal oxides are separated from electrode plates to generate oxygen ions, and the oxygen ions pass through the nickel foam to enter molten salt; 2) during the second electrolysis, no further oxygen removal purification treatment is carried out on the molten salt; the oxygen content in the molten salt is expected to be at least 2 wt% (i.e. 20000 ppm). In addition, the patent document does not describe the porosity of the nickel foam, and the product after the first electrolysis is still wrapped in the nickel foam, so that the raw material and the product are both limited in a narrow space and cannot be separated timely and effectively, the local concentrations of the raw material and the product are both high, and meanwhile, when the raw material and the product are in an electric field, part of the product can excessively react, such as an alloying reaction, and the like, to influence the structure and the form of the product.

Therefore, a method for preparing meckene, which is safe and non-toxic in process, short in time consumption and capable of controlling oxygen, is needed.

Disclosure of Invention

The invention aims to solve the technical problems that the process for preparing the mecienne is complex, the time consumption is long, a toxic etching agent is used, oxygen control is not achieved, and the prepared mecienne cannot be used for preparing a battery material in the prior art, and provides the mecienne, the preparation method thereof, the lithium ion battery and the application.

The invention solves the technical problems through the following technical scheme:

the invention provides a preparation method of michael, which comprises the following steps: electrolyzing MAX phase as anode in molten salt to obtain Mike alkene;

the oxygen content in the molten salt is 100-2000 ppm;

controlling the oxygen content in the molten salt through electrolytic purification, wherein the electrolytic purification time is 2-24 h;

the molten salt is chloride molten salt containing any two or three of LiCl, NaCl and KCl.

In the present invention, the MAX phase may be MAX phase materials conventional in the art, includingTi₃SiC₂、Ti₂A novel machinable ceramic material including AlC, wherein M represents a transition metal element; a represents a main group element; x represents carbon or nitrogen, such as titanium aluminum carbide or silicon titanium carbide, further such as titanium aluminum carbide from Jilin, science and technology Limited or silicon titanium carbide from Jilin, science and technology Limited. The MAX phase may be MAX phase powder. The particle size of the MAX phase powder may be conventional in the art, preferably 1-200 μm, more preferably 10-80 μm, e.g. 74 μm.

In the invention, the molten salt is LiCl-NaCl-KCl molten salt or LiCl-KCl molten salt.

In the present invention, the amount of the MAX phase is 1 to 10g, preferably 2 to 7 g.

In the present invention, the anode may be fabricated by a method conventional in the art, and preferably, the MAX phase is pressed and fixed. Preferably, after the MAX phase is pressed, the MAX phase is directly fixed without being wrapped by nickel foam.

Wherein the pressing may be performed in a mold. The mold may be conventional in the art.

Wherein, after the pressing, the MAX phase is preferably a (5-40 mm) × (5-30 mm) × (0.5-5 mm) flake, such as a 10mm × 30mm × 1mm flake or a 10mm × 30mm × 3.5mm flake.

Wherein, the pressure adopted in the pressing can be conventional in the field, and is preferably 10-45 MPa, such as 25MPa or 35 MPa.

Wherein the fixing operation may be: the pressed MAX phase is fixed to a conductive rod, such as a metal rod or a graphite rod. The metal bar may be a copper bar. The diameter of the conductive rod may be conventional in the art, for example 2-4 mm, for example 3 mm.

In the present invention, the electrolysis may be carried out in an electrolytic cell. The size of the cell may be conventional in the art, with an internal diameter of 40-100mm, a height of 50-200mm and a wall thickness of 0.5-5mm, for example an internal diameter of 80mm, a height of 100mm and a wall thickness of 5 mm.

Wherein the shape and size of the electrolytic cell are generally adjusted according to the amount of the molten salt and the size of the electrode used for the electrolysis, for example, the electrolytic cell is a cylinder with an inner diameter of 80mm, a height of 100mm and a wall thickness of 5 mm. The material of the electrolytic cell can be conventional in the art, such as corundum, graphite, quartz and the like, and further such as corundum.

In the present invention, the mass of the molten salt may be conventional in the art, and is preferably 20 to 2000g, for example 30 g.

In the present invention, the operation of the electrolytic purification may be conventional in the art, for example, the electrolytic purification is performed with a stainless steel rod as a cathode and a graphite rod as an anode before the electrolysis. The atmosphere in the molten salt is typically an inert atmosphere, such as a 99.999% high purity argon atmosphere. The inert atmosphere may be provided generally by a glove box.

In the present invention, the voltage for the electrolytic purification can be 1-5V, preferably 2.8-5V, and more preferably 3-5V.

In the present invention, the time for the electrolytic purification can be 3 to 12 hours, preferably 4 to 12 hours, and more preferably 6 to 12 hours.

In the present invention, before the electrolytic purification, the molten salt is preferably heated to be molten and kept warm. The heating temperature may be conventional in the art, preferably 300 to 750 ℃, more preferably 400 to 650 ℃, such as 430 ℃ or 500 ℃. The time for the heat preservation can be conventional in the art, and is preferably 2-10 h, for example 5 h.

In the present invention, the oxygen content in the molten salt is preferably 100 to 2000ppm, such as 253ppm, 283ppm or 1566 ppm.

In the present invention, the cathode of the electrolysis is generally a high temperature-resistant conductive material, such as a metal material or a graphite material. The size of the cathode can be conventional in the art, such as a rod-shaped material with a diameter of 12-16 mm, and further such as a rod-shaped material with a diameter of 15 mm.

In the present invention, the voltage of the electrolysis may be 1 to 5V, preferably 2 to 5V, such as 2.4V or 2.5V. The electrolysis time may be 4 to 20 hours, preferably 8 to 20 hours, for example 12 hours. Preferably, the voltage of the electrolysis is 2-5V, and the time of the electrolysis is 8-20 h.

In a preferred embodiment, the voltage of the electrolysis is 2V, and the time of the electrolysis is 8 h.

In a preferred embodiment, the voltage of the electrolysis is 2.4V, and the time of the electrolysis is 12 h.

In the present invention, the preparation method of the michael preferably further comprises the following separation steps: the fused salt containing the michael is dissolved and separated.

Wherein the fused salt containing the michael may be cooled before the dissolution.

The solvent used for dissolving can be deionized water or dilute hydrochloric acid, such as deionized water.

Wherein the dissolving generally comprises a process of soaking and rinsing. The soaking time can be 1-10 min, such as 5 min. The number of the rinsing may be 1 to 30 times, for example, 5 times. The solvent amount used in the washing can be 5-2000 mL/time, for example 50 mL/time. The dissolution may be accelerated by an ultrasonic machine. The time of the sonication may be 1 minute.

The method of separation may be conventional in the art, such as suction filtration, among others.

Wherein, the separation can also comprise a drying process. The method of drying may be conventional in the art, such as a hot air oven or a vacuum oven. The drying temperature can be 50-100 ℃, for example 80 ℃. The drying time can be 0.5-12 hours.

The invention also provides the michael which is prepared according to the preparation method.

The invention also provides an application of the mecamirene in a lithium ion battery.

The invention also provides a lithium ion battery, and an electrode material of the lithium ion battery comprises the Michelene.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The reagents and starting materials used in the present invention are commercially available.

The positive progress effects of the invention are as follows:

1) the method of the invention has short time consumption and no toxic etching agent, and prepares fluorine-free michael.

2) After the Mekkoene prepared by the method is used as an electrode material of a lithium ion battery, the Mekkoene can still keep higher reversible capacity in multiple charge-discharge cycles and has better stability.

Drawings

FIG. 1 is an XRD pattern of the mecamirene prepared in example 1.

FIG. 2 is an SEM image of the michael obtained in example 1.

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.

Example 1

2.0g of a 200 mesh (74 μm) MAX phase titanium aluminide carbide Ti are weighed₃AlC₂(purity 98%, available from Jilin science & technologies Co., Ltd.) powder was placed in a stainless steel mold, pressed into a rectangular sheet of 10mm X30 mm X1 mm under a pressure of 25MPa, and the sheet was fixed on a copper rod of 3mm in diameter.

15 g of anhydrous LiCl (AR, chemical reagents of national drug group, Ltd.) and 15 g of KCl (AR, chemical reagents of national drug group, Ltd.) were weighed in an argon glove box (water content <1ppm, oxygen content <1ppm) and placed in a corundum mortar, and ground and mixed by a corundum grinding rod for 10 minutes to prepare 30g of LiCl-KCl mixed powder. About 0.1g of the sample was taken with a small spatula, and the oxygen content was 15348ppm as measured by a LECO RO 600 oxygen analyzer (patent ZL201410184920.3 oxygen measurement method).

Putting the LiCl-KCl mixed powder into a cylindrical corundum electrolytic cell with the inner diameter of 80mm, the height of 100mm and the wall thickness of 5mm, heating to 430 ℃ in an inert atmosphere, preserving the temperature for 5 hours, dipping high-temperature liquid molten salt by using a nickel tube, and measuring by using an LECO oxygen analyzer to obtain the oxygen content of 9567 ppm.

The cathode adopts a stainless steel bar, the anode adopts a graphite bar, 2.8V voltage is applied to two ends of the electrolytic cell, and LiCl-KCl fused salt is electrolyzed and purified for 6 hours. Dipping high-temperature liquid molten salt by using a nickel tube, cooling, grinding, and measuring by using an LECO oxygen analyzer to obtain the oxygen content of 253 ppm. Electrolyzing with 15mm stainless steel rod as cathode and MAX phase sheet fixed copper rod as anode at 2.0V for 8 hr to obtain mecien Ti₃C₂T_x(T＝Cl，O)。

After the fused salt containing the mecamirene is cooled and solidified, 50mL of deionized water is poured into the corundum crucible, the corundum crucible is shaken manually and soaked for 5 minutes, an ultrasonic machine is adopted to accelerate dissolution for 1 minute, and after the corundum crucible is stood for a while, the supernatant is poured out. And repeatedly adding water for washing and ultrasonically dissolving for 5 times, wherein no visible molten salt blocks exist in the water, and a gray-black Megaku alkene suspension is formed. And carrying out suction filtration on the mecamirene suspension, adding water, and repeatedly washing to obtain the high-purity mecamirene on filter paper. Then, the filter paper and the mecamirene are put into a vacuum oven to be dried for 12 hours at 80 ℃, the mecamirene on the surface of the filter paper is lightly scraped by a stainless steel spoon, and the filter paper and the mecamirene are filled into a small reagent bottle.

By adopting an ICP-MS method (GB/T30903-2014 inductively coupled plasma mass spectrometry) to measure the impurity elements of the inorganic chemical products, the following results are obtained: the Al content in the raw material is 0.28g, the Al content in the product is 0.00g, and the conversion rate is 100% by comparing the Al content with the Al content in the product.

Example 2

7.0g of a 200 mesh (74 μm) MAX phase titanium silicon carbide Ti were weighed₃SiC₂(purity 98%, Jilin science & technologies Co., Ltd.) powder was placed in a stainless steel mold, pressed into a rectangular sheet of 10mm by 30mm by 3.5mm under a pressure of 35MPa, and the MAX phase of the sheet was fixed to a copper rod of 3mm in diameter.

In an argon glove box (water content <1ppm, oxygen content <1ppm), 10.6 g of anhydrous LiCl (AR, chemical reagents of national drug group Co., Ltd.), 4.7 g of NaCl (AR, chemical reagents of national drug group Co., Ltd.) and 14.7 g of KCl (AR, chemical reagents of national drug group Co., Ltd.) were weighed and placed in a corundum mortar, and manually ground and mixed for 10 minutes by a corundum grinding rod to prepare 30g of LiCl-NaCl-KCl mixed powder. The oxygen content was found to be 17104ppm by the same method as in example 1.

Placing the LiCl-NaCl-KCl mixed powder into a cylindrical corundum electrolytic tank with the inner diameter of 80mm, the height of 100mm and the wall thickness of 5mm, heating to 500 ℃ in an inert atmosphere, preserving the temperature for 5 hours, and measuring the oxygen content to 10253ppm by adopting the same method as the example 1.

The cathode was a stainless steel rod, the anode was a graphite rod, and a voltage of 3.0V was applied across the electrolytic cell to purify LiCl-NaCl-KCl molten salt by electrolysis for 3 hours, and the oxygen content was 1566ppm by the same method as in example 1. Electrolyzing with 15mm stainless steel rod as cathode and MAX phase sheet fixed copper rod as anode at 2.4V for 12 hr to obtain mecien Ti₃C₂T_x(T＝Cl，O)。

The procedure for analyzing the fused salt containing mecamirene was the same as in example 1.

By adopting an ICP-MS method (GB/T30903-2014 inductively coupled plasma mass spectrometry) to measure the impurity elements of the inorganic chemical products, the following results are obtained: the Si content in the raw material is 1.00g, the Si content in the product is 0.00g, and the conversion rate is 100% by comparing the Si content with the Si content in the product.

Example 3

The difference from example 1 is that: the oxygen content in the molten salt after electrolytic deoxygenation is 287 ppm; the voltage for preparing the mecamirene by the electrolysis method is 2.5V, and the electrolysis time is 4 h.

By adopting an ICP-MS method (GB/T30903-2014 inductively coupled plasma mass spectrometry) to measure the impurity elements of the inorganic chemical products, the following results are obtained: the Al content in the raw material was 0.28g, and the Al content in the product was 0.18g, which resulted in a conversion of 35.7% as compared to the other. At a voltage of 2.5V, the electrolysis time is relatively short, so that the conversion rate of the raw materials is low, and the product contains more Al.

Comparative example 1

The difference from example 1 is that: the electrolytic purification time was 1 hour, and the oxygen content in the molten salt was 2305ppm as measured by an LECO oxygen analyzer.

Comparative example 2

The difference from example 1 is that: the oxygen content in the molten salt was determined to be 15348ppm by an LECO oxygen analyzer without controlling the oxygen content in the molten salt.

Effects of the embodiment

(1) XRD test: the crystal structures of the products of examples 1-3 and comparative examples 1-2 were analyzed by X-ray diffraction (XRD).

The meckene is structurally characterized in that M atomic layers and X atomic layers are regularly and alternately arranged, the distance between the two atomic layers is the same as the magnitude of Cu-K alpha ray wavelength commonly used by X-ray diffraction analysis (XRD), and therefore, a stronger diffraction peak is always presented in an interval of 2 theta <10 degrees on an XRD spectrum.

As shown in FIG. 1, Mekocene Ti was observed in the product of example 1 at a diffraction angle 2. theta. of about 7.9 degrees₃C₂T_xCharacteristic absorption peaks of (T ═ Cl, O).

Mekotene Ti was observed in the product of example 2 at a diffraction angle 2. theta. of about 8.3 degrees₃C₂T_xCharacteristic absorption peaks of (T ═ Cl, O).

Mekotene Ti was observed in the product of example 3 at a diffraction angle 2. theta. of about 7.8 degrees₃C₂T_xCharacteristic absorption peak of (T ═ Cl, O), and MAX phase Ti was observed around 10.8 degrees 2 θ₃AlC₂Characteristic absorption peak of (1).

The products of comparative examples 1 and 2 disappeared the characteristic absorption peak of the MAX phase of the starting material in the vicinity of a diffraction angle 2 θ of 10.8 degrees, but the characteristic absorption peak of mecien was not observed in the vicinity of a diffraction angle 2 θ of 7.8 degrees, indicating that no mecien was formed.

(2) And (4) SEM test: the microscopic morphologies of the product of example 1 were observed by Scanning Electron Microscopy (SEM) and all exhibited a typical michael sheet stacking structure, and the SEM photograph of the product of example 1 is shown in fig. 2.

The elemental compositions of the products of examples 1 and 2 were analyzed by Energy Dispersive Spectroscopy (EDS) with SEM, and it was found that the Al content in example 1 was below the detection limit, indicating that the MAX phase raw material titanium aluminum carbide Ti₃AlC₂The Al element in the alloy is completely removed; detecting implementation simultaneouslyThe product in example 1 contains oxygen element and chlorine element and does not contain fluorine element; the Si element in example 2 is lower than the detection limit, indicating that Ti is contained in the MAX phase raw material₃SiC₂Si element in the alloy is completely removed; meanwhile, the product in example 2 contains oxygen and chlorine and no fluorine.

(3) Testing of battery performance:

the products of example 1, example 2 and comparative example 2 were mixed with carbon black and PTFE in a mass ratio of 8:15:5 to prepare a button half cell in the manner of example 1 described in publication No. CN 111342003A;

weighing 1.05mg of meckene in example 1, preparing lithium ion battery from meckene in example 1 to obtain constant current charge-discharge curve of negative electrode of lithium ion battery, and still maintaining reversible capacity of 130mAh/g after circulating 1000 times under 1A/g condition; the Mekkoene in the embodiment is proved to be a lithium ion battery cathode material with excellent performance, and has potential application value.

Weighing 1.01mg of mecamirene in example 2, preparing the lithium ion battery according to the method, and still maintaining the reversible capacity of 115mAh/g after circulating for 400 times under the condition of 1A/g; the Mekkoene in the embodiment is proved to be a lithium ion battery cathode material with excellent performance, and has potential application value.

Weighing 1.03mg of the product in the comparative example 2, preparing the lithium ion battery according to the method to obtain a constant current charge-discharge curve of the negative electrode of the lithium ion battery, circulating for 50 times under the condition of 1A/g, and enabling the reversible capacity to be lower than 5 mAh/g; indicating that the product cannot be used as a lithium ion battery cathode material.