Electrode material of lithium-ion battery, and preparation method therefor

Abstract

A preparation method for an electrode material of a lithium-ion battery. The preparation method comprises the steps of the preparation of an MOF material, the pretreatment of the MOF material, and a selenylation treatment, wherein the pretreatment of the MOF material is implemented by soaking the MOF material in a mixed aqueous solution of glucose and alkyl glycoside, and maintaining the temperature at 70-90°C for 0.5-1 h, wherein the mass ratio of glucose to alkyl glycoside in the mixed aqueous solution is 4:0.5-1. The uniformly dispersed cubic carbon-based electrode material prepared in the present invention effectively alleviates the volume expansion effect, has a purity of up to 99.3%, has good lithium storage performance and cycle stability, has a discharge capacity of 662 mAh g-1 after 200 charge-discharge cycles at a current density of 100 mAh g-1, exhibits stable charging and discharging performance during the cycles, has a long cycle life, and can avoid performance degradation after 1,000 cycles.

Description

Lithium ion battery electrode material and preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy materials, in particular to a lithium ion battery electrode material and a preparation method thereof. BACKGROUND

[0002] The negative electrode material of the current commercial lithium ion battery is usually graphite, but the theoretical capacity of graphite is only 372 mAh / g, which cannot meet the demand of high-performance lithium ion batteries. Transition metal selenides not only have high theoretical specific capacity, but also have low voltage platform and small polarization, and are a kind of potential lithium ion battery negative electrode material. However, during the charging and discharging process of transition metal selenides, a huge volume change occurs, the active material is pulverized, the active material is separated from the current collector, the capacity attenuation is caused, and the cycle life and stability of the material are poor.

[0003] Compared with single metal selenide, double metal selenide has lower band gap and better electrical conductivity, and has attracted great attention as a battery electrode material. However, the morphology and structure of double metal selenide have a significant influence on its electrochemical performance. For example, the same material has different structures such as nanowire, nanosheet, nanotube and nanosphere, and the electrochemical performance exhibited by the same material also has obvious differences. The lithium storage capacity and cycle stability of the electrode material have a decisive influence on the endurance and stability of the automobile performance when it is applied to the automobile field. SUMMARY

[0004] The present application aims to provide a lithium ion battery electrode material, specifically a cubic carbon-based composite material composed of cubic selenide and carbon.

[0005] Another object of the present application is to provide a preparation method of the above-mentioned lithium ion battery electrode material. The selenide carbon-based composite material prepared by the method can effectively inhibit the volume expansion effect and can be effectively applied to new energy vehicles as the negative electrode material of the lithium ion battery of the vehicle.

[0006] The object of the present application is achieved by the following technical scheme:

[0007] A preparation method of a lithium ion battery electrode material, characterized in that: it comprises the steps of preparing a MOF material, pretreating the MOF material and selenizing the pretreated MOF material, the pretreatment of the MOF material is soaking the MOF material in a mixed aqueous solution of glucose and alkyl glycoside, and then drying after incubation at 70-90 DEG C for 0.5-1 h.

[0008] The mass percentage concentration of glucose in the mixed aqueous solution is 20-40%, and the mass ratio of glucose to alkyl glycoside is 4:0.5-1.

[0009] Further, the selenium treatment is to place the pretreated MOF material and selenium powder in a tube furnace, the selenium powder is upstream, the MOF material is downstream, under the argon atmosphere, the temperature is increased to 400-450 DEG C at the rate of 2-5 DEG C / min, and the temperature is kept for 1.5-2.5 h, during which the argon flow is 45-60 sccm, then the temperature is continuously increased to 550-600 DEG C, and the temperature is kept for 0.5-1 h, during which the argon flow is 30-40 sccm.

[0010] If the specific surface area of the electrode material is too small, the rate performance of the material is poor, and the cycle performance is also poor, therefore, increasing the specific surface area of the material to a certain extent is beneficial to improving the performance of the electrode material. The cubic structure of the double metal selenide composite material has a high specific surface area, which can effectively improve the electrochemical performance of the material. However, due to the cubic structure of the MOF material, it is difficult to ensure the stability of the cubic structure during the high-temperature selenization process, and the structure is easily broken during the selenization process, resulting in the collapse of the cubic structure, and the morphology is damaged and irregular, and the carbon material is also difficult to completely wrap the double metal selenide formed by selenization. When the material is used as an electrode material, the material will face serious volume expansion effect during the charging and discharging process, resulting in the decline of the cycle stability, service life and other electrochemical performances of the material.

[0011] The cubic MnCo-MOF material prepared in the application is pretreated by using a high-concentration mixed aqueous solution of glucose and alkyl glycoside and heating and soaking, and then subjected to step-by-step selenization. During the soaking process, the glucose slowly penetrates into the MnCo-MOF material under the action of the alkyl glycoside and heating, and the alkyl glycoside and glucose that penetrate into the MnCo-MOF material change the interface properties of the MnCo-MOF material during the subsequent selenization, stabilize the template effect of the MnCo-MOF material, and effectively inhibit the problems of structure breakage, collapse and agglomeration during the selenization process.

[0012] During the selenization treatment, the two-step selenization, the adjustment of the argon gas flow and the regulation of the selenization process in the application effectively reduce the generation of impurities during the selenization process. At the same time, under the above selenization treatment, the interaction between the alkyl glycoside, glucose and organic ligand during the carbonization process is adjusted, which induces the uniform coating of the carbon material to the surface of the double metal selenide during the carbonization process, and improves the coating integrity of the carbon material to the metal selenide.

[0013] The two metal elements in the cubic structure bimetallic selenide above provide more reactive sites through the reaction, increase the lithium storage performance, and in the cubic structure, act as a buffer matrix for each other, effectively relieving the volume effect generated during charging and discharging. The uniform and complete carbon layer on the surface combined with the specific cubic structure further reduces the volume expansion and improves the electrical conductivity of the material, showing excellent lithium ion cycle stability. These properties optimize the electrochemical performance of lithium ion batteries when the material is used as an electrode material for lithium ion batteries for new energy vehicles, thereby effectively improving the endurance and stability of new energy vehicles.

[0014] Further, the preparation of the MOF material is to dissolve Mn(CH3COO)2·4H2O and PVP-K30 in a mixed solvent composed of anhydrous ethanol and deionized water to obtain solution A, dissolve K3Co(CN)6 in deionized water to obtain solution B, and mix solution A and solution B at room temperature to obtain the MnCo-MOF material.

[0015] Further, in the solution A, the mass ratio of Mn(CH3COO)2·4H2O and PVP-K30 is 0.22~0.44:0.75~3, the mass-volume ratio of Mn(CH3COO)2·4H2O to the mixed solvent is 0.1~0.5:100, and the unit is g / mL, and the volume ratio of anhydrous ethanol to deionized water is 2:1.

[0016] Further, in the solution B, the mass-volume ratio of K3Co(CN)6 and deionized water is 0.13~0.68:100, and the unit is g / mL.

[0017] Further, the solution A and the solution B are mixed according to the molar ratio of Mn to Co of 1.2~1.8:1 at room temperature for 15~26h.

[0018] Most specifically, a preparation method of a lithium ion battery electrode material, characterized in that it comprises the following steps:

[0019] (1) Synthesis of MnCo-MOF material

[0020] Mn(CH3COO)2.4H2O and PVP-K30 are dissolved in a mixed solvent of anhydrous ethanol and deionized water to obtain solution A, K3Co(CN)6 is dissolved in deionized water to obtain solution B, solution A and solution B are mixed in a molar ratio of Mn to Co of 1.2-1.8:1, and aging is performed at room temperature for 15-26 h, the precipitate is collected by centrifugation, washed with ethanol and deionized water in sequence, and then dried to obtain MnCo-MOF, in the solution A, the mass ratio of Mn(CH3COO)2.4H2O to PVP-K30 is 0.22-0.44:0.75-3, the mass-volume ratio of Mn(CH3COO)2.4H2O to the mixed solvent is 0.1-0.5:100, the unit is g / mL, the volume ratio of anhydrous ethanol to deionized water is 2:1, in the solution B, the mass-volume ratio of K3Co(CN)6 to deionized water is 0.13-0.68:100, the unit is g / mL;

[0021] (2) Pretreatment

[0022] The MnCo-MOF material is soaked in a mixed aqueous solution of glucose and alkyl glycoside, incubated at 70-90℃ for 0.5-1 h, and then dried, the mass percentage concentration of glucose in the mixed aqueous solution is 20-40%, and the mass ratio of glucose to alkyl glycoside is 4:0.5-1;

[0023] (3) Selenization treatment

[0024] The pretreated MnCo-MOF material and selenium powder are placed in a tube furnace, the selenium powder is upstream and the MnCo-MOF material is downstream, the temperature is raised to 400-450℃ at a rate of 2-5℃ / min under an argon atmosphere, and the temperature is kept for 1.5-2.5 h, during which the argon flow rate is 45-60 sccm, then the temperature is further raised to 550-600℃, and the temperature is kept for 0.5-1 h, during which the argon flow rate is 30-40 sccm, to obtain the MnSe2 / CoSe2 / C composite material.

[0025] A lithium ion battery electrode material is characterized in that: the electrode material is a composite material composed of cubic selenium compound and carbon, and the carbon material is coated on the surface of the double-metal selenium compound, and the composite material is a MnSe2 / CoSe2 / C composite material obtained by pretreatment and selenization treatment of MnCo-MOF material as a precursor.

[0026] Further, the MnCo-MOF material is obtained by dissolving Mn(CH3COO)2.4H2O and PVP-K30 in a mixed solvent of anhydrous ethanol and deionized water to obtain solution A, dissolving K3Co(CN)6 in deionized water to obtain solution B, and mixing solution A and solution B to obtain MnCo-MOF by aging at room temperature.

[0027] Further, in the solution A, the mass ratio of Mn(CH3COO)2.4H2O and PVP-K30 is 0.22-0.44:0.75-3, and the mass-volume ratio of Mn(CH3COO)2.4H2O and the mixed solvent is 0.1-0.5:100, unit g / mL, and the volume ratio of anhydrous ethanol and deionized water is 2:1.

[0028] Further, in the solution B, the mass-volume ratio of K3Co(CN)6 and deionized water is 0.13-0.68:100, unit g / mL.

[0029] Further, the solution A and the solution B are mixed according to the molar ratio of Mn and Co being 1.2-1.8:1, and aged at room temperature for 15-26h.

[0030] Further, the pretreatment is to soak the MnCo-MOF material in a mixed aqueous solution of glucose and alkyl glycoside, incubate at 70-90℃ for 0.5-1h, and then dry, the mass percentage concentration of glucose in the mixed aqueous solution is 20-40%, and the mass ratio of glucose and alkyl glycoside is 4:0.5-1.

[0031] Further, the selenium treatment is to place the pretreated MnCo-MOF material and selenium powder in a tube furnace, the selenium powder is upstream and the MnCo-MOF material is downstream, under argon atmosphere, the temperature is raised to 400-450℃ at a rate of 2-5℃ / min, and incubated for 1.5-2.5h, during which the argon flow rate is 45-60sccm, then continue to raise the temperature to 550-600℃, continue to incubate for 0.5-1h, during which the argon flow rate is 30-40sccm.

[0032] The present application has the following technical effects:

[0033] The MnSe2 / CoSe2 / C composite material in the present application has a uniform cubic structure, uniform morphology, uniform size, excellent dispersibility, and high purity, the purity can be as high as 99.3%, and the carbon layer forms a complete coating for the double-metal selenide. The carbon-based electrode material prepared by the present application has excellent structural stability, is in a uniform and dispersed cubic shape, the carbon layer is completely coated on the double-metal selenide, effectively alleviates the volume expansion effect, has excellent lithium storage performance and cycle stability, and after 200 charge-discharge cycles at a current density of 100 mA g -1 , the discharge capacity is 662mAh g -1 , the charge-discharge performance is stable during the cycle process, and the cycle life is long, and the performance does not decay in 1000 cycles, which widens the selection field for the improvement of the endurance of new energy vehicles. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1: XRD pattern of cubic MnSe2 / CoSe2 / C composite material prepared in Example 1 of the present application.

[0035] Figure 2: SEM image of cubic MnSe2 / CoSe2 / C composite material prepared in Example 1 of the present application.

[0036] Figure 3: TEM image of cubic MnSe2 / CoSe2 / C composite material prepared in Example 1 of the present application.

[0037] Figure 4: SEM images of composite materials prepared in each of the comparative examples.

[0038] Figure 5: Raman pattern of cubic MnSe2 / CoSe2 / C composite material prepared in Example 1 of the present application.

[0039] Figure 6: TGA pattern of cubic MnSe2 / CoSe2 / C composite material prepared in Example 1 of the present application.

[0040] Figure 7: CV pattern of cubic MnSe2 / CoSe2 / C composite material prepared in Example 1 of the present application.

[0041] Figure 8: EIS pattern of cubic MnSe2 / CoSe2 / C composite material prepared in Example 1 of the present application.

[0042] Figure 9: Charge-discharge cycle pattern of cubic MnSe2 / CoSe2 / C composite material prepared in Example 1 of the present application. DETAILED DESCRIPTION

[0043] The following examples are only used to further illustrate the present application and should not be construed as limiting the scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above content of the present application. Example 1

[0044] A preparation method of a lithium ion battery electrode material, comprising the following steps:

[0045] (1) Synthesis of MnCo-MOF material

[0046] Dissolve Mn(CH3COO)2·4H2O and PVP-K30 in a mixed solvent of anhydrous ethanol and deionized water to obtain solution A, dissolve K3Co(CN)6 in deionized water to obtain solution B, mix solution A and solution B at a molar ratio of Mn to Co of 1.5:1, and age at room temperature for 20 h, centrifugal collection, washing with ethanol and deionized water in sequence, and drying to obtain MnCo-MOF, wherein the mass ratio of Mn(CH3COO)2·4H2O to PVP-K30 in solution A is 0.40:0.75~3, the mass-volume ratio of Mn(CH3COO)2·4H2O to the mixed solvent is 0.1~0.5:100, the unit is g / mL, the volume ratio of anhydrous ethanol to deionized water is 2:1, and the mass-volume ratio of K3Co(CN)6 to deionized water in solution B is 0.13~0.68:100, the unit is g / mL;

[0047] (2) Pretreatment

[0048] Soak the MnCo-MOF material in a mixed aqueous solution of glucose and alkyl glycoside, incubate at 70~90℃ for 0.5~1h, and then dry, wherein the mass percentage concentration of glucose in the mixed aqueous solution is 30%, and the mass ratio of glucose to alkyl glycoside is 4:0.5~1;

[0049] (3) Selenization treatment

[0050] Place the pretreated MnCo-MOF material and selenium powder in a tube furnace, with selenium powder upstream and MnCo-MOF material downstream, heat to 420℃ at a rate of 5℃ / min under an argon atmosphere, and incubate for 2h, then continue to heat to 580℃, continue to incubate for 0.5h, and the argon flow rate is 35sccm during the process, to obtain MnSe2 / CoSe2 / C composite material.

[0051] Figure 1 is the XRD pattern of the MnSe2 / CoSe2 / C composite material prepared in this embodiment, it can be seen that the characteristic peaks of the prepared composite material are obvious, the purity is high, the purity of the MnSe2 / CoSe2 / C composite material is calculated to be 99.3%, the impurity content is low, and the yield reaches 77.8%.

[0052] Figures 2 and 3 are scanning electron microscope and transmission electron microscope images of the MnSe2 / CoSe2 / C composite material prepared in this embodiment, respectively, from Figure 2, it can be seen that the composite material is uniformly dispersed, with regular cubic structure, uniform structure size, and a dense carbon layer uniformly attached to the surface, making the material surface have a uniform rough structure, and from Figure 3, it can be observed that a uniform carbon layer is formed on the surface of the bimetallic selenide, forming complete coating.

[0053] Figure 5 is a Raman spectrum of the MnSe2 / CoSe2 / C composite material prepared in the present embodiment. The ratio of the intensity of the D peak and the G peak, i.e. ID / IG, is greater than 1, indicating that the disordered carbon content in the MnSe2 / CoSe2 / C composite material is dominant, which is more conducive to the storage of lithium ions.

[0054] Figure 6 is a TGA graph of the MnSe2 / CoSe2 / C composite material prepared in the present embodiment. The MnSe2 / CoSe2 / C composite material has two consecutive mass loss processes in the range of 300-550 o C. These mass losses are caused by the combustion of carbon in air.

[0055] Figure 7 is a CV graph of the MnSe2 / CoSe2 / C composite material prepared in the present embodiment. The CV graphs of the 2nd and 3rd cycles are well overlapped, indicating that the MnSe2 / CoSe2 / C composite material has high reversibility for lithiation / delithiation reactions.

[0056] The MnSe2 / CoSe2 / C composite material prepared in the present embodiment well maintains the cubic morphology of the binary metal organic framework compound, has high crystallinity, high specific surface area and porosity, and exhibits excellent lithium storage performance, large storage capacity, long cycle life, at least 1000 cycles without performance degradation, good stability during use, and no current fluctuation. -1 As shown in Figure 9, after 200 charge-discharge cycles at a current density of 100 mA g -1 , the lithium ion battery for new energy vehicles has excellent lithium storage performance and charge-discharge cycle stability.

[0057] Comparative Example 1

[0058] Compared with Example 1, the difference lies in that the seleniumization step of the pretreated MnCo-MOF material is as follows:

[0059] The pretreated MnCo-MOF material and selenium powder are placed in a tube furnace, the selenium powder is upstream and the MnCo-MOF material is downstream, heated to 420℃ at a rate of 5℃ / min under argon atmosphere, and kept for 2h, during which the argon flow rate is 35sccm, then heated to 580℃, and kept for 0.5h, during which the argon flow rate is 50sccm, to obtain the MnSe2 / CoSe2 / C composite material.

[0060] Comparative Example 2

[0061] Compared with Example 1, the MnCo-MOF material was prepared according to the method in Example 1, and when the MnCo-MOF material was pretreated, a 30% by mass concentration glucose aqueous solution was used as the soaking solution, and then the same seleniumization treatment as in Example 1 was directly performed with selenium powder.

[0062] Blank group:

[0063] Compared with Example 1, the MnCo-MOF material was not pretreated, and was directly seleniumized. The seleniumization step was that the MnCo-MOF material and the selenium powder were placed in a tube furnace, the selenium powder was upstream, and the MnCo-MOF material was downstream. The temperature was raised to 580℃ at a rate of 5℃ / min under an argon atmosphere, and the temperature was continuously maintained for 2.5h. The argon gas flow rate during the process was 50sccm, and the MnSe2 / CoSe2 / C composite material was prepared.

[0064] The scanning electron microscope images of the composite material products prepared in each of the comparative examples are shown in FIG. 4. As can be seen from the electron microscope images of the products of Comparative Example 1 (a), Comparative Example 2 (b) and the blank group (c), in Comparative Example 1, only pretreatment was performed, and because the argon gas flow rate was adjusted during the seleniumization process, although the cubic structure was mostly retained, the carbon material was not well coated on the surface thereof, but was formed between the cubic particles. In Comparative Example 2, without adding alkyl glycoside in the pretreatment, the product prepared could not maintain the cubic structure, and other morphological structures were formed. In the blank group, the structure collapsed, and the morphology was more chaotic. It was detected and calculated that the purity of the composite materials prepared in Comparative Example 1, Comparative Example 2 and the blank group was 81.9%, 95.6% and 76.3%, respectively.

[0065] In the long-term test, we also tried to adjust the molar ratio of Mn and Co in the MnCo-MOF material, and found that the MOF material prepared basically could prepare a uniform cubic structure, which could be used as a template for subsequent preparation of the composite material. However, as the molar ratio of Mn and Co changed, it would affect the proportion of Mn-based selenides and Co-based selenides in the MnSe2 / CoSe2 / C composite material prepared subsequently, thereby affecting the lithium storage performance. Under the condition that other conditions were unchanged, when the molar ratio of Mn and Co was 1.2-1.8:1, the lithium storage performance of the MnSe2 / CoSe2 / C composite material prepared was the best. Example 2

[0066] A preparation method of a lithium ion battery electrode material, comprising the following steps:

[0067] (1) Synthesis of MnCo-MOF material

[0068] Mn(CH3COO)2·4H2O and PVP-K30 were dissolved in a mixed solvent of anhydrous ethanol and deionized water to obtain solution A, K3Co(CN)6 was dissolved in deionized water to obtain solution B, solution A and solution B were mixed in a molar ratio of Mn to Co of 1.2:1, and were aged at room temperature for 26 h, and then were centrifuged to collect the precipitate, which was washed with ethanol and deionized water in sequence and then dried to obtain MnCo-MOF, in the solution A, the mass ratio of Mn(CH3COO)2·4H2O to PVP-K30 was 0.44:3, the mass-volume ratio of Mn(CH3COO)2·4H2O to the mixed solvent was 0.5:100 (g / mL), the volume ratio of anhydrous ethanol to deionized water was 2:1, and in the solution B, the mass-volume ratio of K3Co(CN)6 to deionized water was 0.68:100 (g / mL);

[0069] (2) Pretreatment

[0070] The MnCo-MOF material was soaked in a mixed aqueous solution of glucose and alkyl glycoside, and was incubated at 90℃ for 0.5 h, and then was dried, the mass percentage concentration of glucose in the mixed aqueous solution was 20%, and the mass ratio of glucose to alkyl glycoside was 4:0.5;

[0071] (3) Selenization treatment

[0072] The pretreated MnCo-MOF material and selenium powder were placed in a tube furnace, the selenium powder was upstream and the MnCo-MOF material was downstream, the temperature was raised to 450℃ at a rate of 3℃ / min under an argon atmosphere, and was incubated for 1.5 h, during which the argon flow rate was 60 sccm, and then the temperature was continuously raised to 550℃, and was continuously incubated for 1 h, during which the argon flow rate was 40 sccm, to obtain the MnSe2 / CoSe2 / C composite material.

[0073] The MnSe2 / CoSe2 / C composite material prepared in this example had a uniform cubic structure, uniform size and high purity, and the purity of the MnSe2 / CoSe2 / C composite material was calculated to be 99.1%. When the material was used as an ion battery electrode material, the discharge capacity still reached 647 mAh g-1 after 200 charge-discharge cycles at a current density of 100 mA g-1. -1 -1 Example 3

[0074] A preparation method of a lithium ion battery electrode material, comprising the following steps:

[0075] (1) Synthesis of MnCo-MOF material

[0076] ​​Mn(CH3COO)2·4H2O and PVP-K30 were dissolved in a mixed solvent of anhydrous ethanol and deionized water to obtain solution A, K3Co(CN)6 was dissolved in deionized water to obtain solution B, solution A and solution B were mixed in a molar ratio of Mn to Co of 1.8:1, and the mixture was aged at room temperature for 15 h, then centrifuged to collect the precipitate, which was washed with ethanol and deionized water in sequence, and then dried to obtain MnCo-MOF, in the solution A, the mass ratio of Mn(CH3COO)2·4H2O to PVP-K30 was 0.22:0.75, the mass-volume ratio of Mn(CH3COO)2·4H2O to the mixed solvent was 0.1:100 (g / mL), the volume ratio of anhydrous ethanol to deionized water was 2:1, in the solution B, the mass-volume ratio of K3Co(CN)6 to deionized water was 0.13:100 (g / mL);

[0077] (2) Pretreatment

[0078] The MnCo-MOF material was soaked in a mixed aqueous solution of glucose and alkyl glycoside at 70℃ for 1 h, and then dried, the mass percentage concentration of glucose in the mixed aqueous solution was 40%, and the mass ratio of glucose to alkyl glycoside was 4:1;

[0079] (3) Selenization treatment

[0080] The pretreated MnCo-MOF material and selenium powder were placed in a tube furnace, the selenium powder was upstream and the MnCo-MOF material was downstream, the temperature was raised to 450℃ at a rate of 2℃ / min under an argon atmosphere, and the temperature was kept for 2.5 h, during which the argon flow rate was 45 sccm, then the temperature was further raised to 600℃, and the temperature was kept for 0.5-1 h, during which the argon flow rate was 30 sccm, thereby obtaining the MnSe2 / CoSe2 / C composite material.

[0081] The MnSe2 / CoSe2 / C composite material prepared in this example has a uniform cubic structure, uniform size and high purity, and the purity of the MnSe2 / CoSe2 / C composite material is calculated to be 99.2%. When the material is used as a lithium ion battery electrode material, the discharge capacity still reaches 637 mAh g-1 after 200 charge-discharge cycles at a current density of 100 mA g-1. -1 -1 ​​

Claims

1. A method of preparing a lithium-ion battery electrode material, characterized by: The method comprises the steps of preparing a MOF material, pre-treating the MOF material, and selenizing the MOF material, wherein the pre-treating of the MOF material comprises the following steps: soaking the MOF material in a mixed aqueous solution of glucose and alkyl glycoside, keeping the mixed aqueous solution at 70-90 DEG C for 0.5-1 h, and then drying the MOF material, wherein the mass percentage concentration of glucose in the mixed aqueous solution is 20-40%, and the mass ratio of glucose to alkyl glycoside is 4:0.5-1.

2. The method for preparing the lithium-ion battery electrode material as described in claim 1, characterized in that: The selenizing of the MOF material comprises the following steps: placing the pre-treated MOF material and selenium powder in a tube furnace, with the selenium powder upstream and the MOF material downstream, heating the MOF material to 400-450 DEG C at a rate of 2-5 DEG C / min under an argon atmosphere, keeping the MOF material at 400-450 DEG C for 1-1.5 h, wherein the argon flow rate is 45-60 sccm during the heating process, and then heating the MOF material to 550-600 DEG C, keeping the MOF material at 550-600 DEG C for 1-2.5 h, wherein the argon flow rate is 30-40 sccm during the heating process.

3. The method for preparing the lithium-ion battery electrode material as described in claim 2, characterized in that: The preparation of the MOF material comprises the following steps: dissolving Mn(CH3COO)2.4H2O and PVP-K30 in a mixed solvent of anhydrous ethanol and deionized water to obtain solution A, dissolving K3Co(CN)6 in deionized water to obtain solution B, and mixing solution A and solution B to obtain the MnCo-MOF material.

4. The method for preparing the lithium-ion battery electrode material as described in claim 3, characterized in that: In the solution A, the mass ratio of Mn(CH3COO)2.4H2O to PVP-K30 is 0.22-0.44:0.75-3, the mass-volume ratio of Mn(CH3COO)2.4H2O to the mixed solvent is 0.1-0.5:100 (g / mL), and the volume ratio of anhydrous ethanol to deionized water is 2:

1.

5. The method for preparing the lithium-ion battery electrode material as described in claim 4, characterized in that: In the solution B, the mass-volume ratio of K3Co(CN)6 to deionized water is 0.13-0.68:100 (g / mL).

6. A method of producing a lithium ion battery electrode material, characterized by, The method comprises the following steps: (1) synthesizing the MnCo-MOF material dissolving Mn(CH3COO)2.4H2O and PVP-K30 in a mixed solvent of anhydrous ethanol and deionized water to obtain solution A, dissolving K3Co(CN)6 in deionized water to obtain solution B, and mixing solution A and solution B according to a molar ratio of Mn to Co of 1.2-1.8:1, aging the mixture at room temperature for 15-26 h, centrifuging to collect the precipitate, washing the precipitate with ethanol and deionized water in sequence, and then drying the precipitate to obtain the MnCo-MOF material, wherein in the solution A, the mass ratio of Mn(CH3COO)2.4H2O to PVP-K30 is 0.22-0.44:0.75-3, the mass-volume ratio of Mn(CH3COO)2.4H2O to the mixed solvent is 0.1-0.5:100 (g / mL), and the volume ratio of anhydrous ethanol to deionized water is 2:1, and in the solution B, the mass-volume ratio of K3Co(CN)6 to deionized water is 0.13-0.68:100 (g / mL); (2) pre-treating the MOF material The MnCo-MOF material is soaked in a mixed aqueous solution of glucose and alkyl glycoside, the mixed aqueous solution has a mass percentage concentration of glucose of 20-40%, and the mass ratio of glucose to alkyl glycoside is 4:0.5-1, and then the mixture is incubated at 70-90℃ for 0.5-1h, and then dried. (3) Selenization treatment The pretreated MnCo-MOF material and selenium powder are placed in a tube furnace, the selenium powder is upstream and the MnCo-MOF material is downstream, the temperature is raised to 400-450℃ at a rate of 2-5℃ / min under an argon atmosphere, and the mixture is incubated for 1-1.5h, during which the argon flow rate is 45-60sccm, then the temperature is further raised to 550-600℃, and the mixture is further incubated for 1-2.5h, during which the argon flow rate is 30-40sccm, thereby obtaining the MnSe2 / CoSe2 / C composite material.

7. A lithium-ion battery electrode material, characterized by: The electrode material is a cubic MnSe2 / CoSe2 / C composite material, in which carbon material is coated on the surface of the bimetallic selenide MnSe2 / CoSe2, and the MnSe2 / CoSe2 / C composite material is obtained by selenization treatment of a pretreated MnCo-MOF material.

8. The lithium-ion battery electrode material of claim 7, wherein: The pretreatment is soaking the MnCo-MOF material in an aqueous solution of glucose and alkyl glycoside, and then drying the mixture after incubation at 70-90℃ for 0.5-1h, the mixed aqueous solution has a mass percentage concentration of glucose of 20-40%, and the mass ratio of glucose to alkyl glycoside is 4:0.5-1.

9. The lithium-ion battery electrode material of claim 8, wherein: The selenization treatment is placing the pretreated MnCo-MOF material and selenium powder in a tube furnace, the selenium powder is upstream and the MnCo-MOF material is downstream, the temperature is raised to 400-450℃ at a rate of 2-5℃ / min under an argon atmosphere, and the mixture is incubated for 1-1.5h, during which the argon flow rate is 45-60sccm, then the temperature is further raised to 550-600℃, and the mixture is further incubated for 1-2.5h, during which the argon flow rate is 30-40sccm.

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