Zinc vanadate negative electrode material, preparation method thereof and lithium ion battery
Through the preparation of zinc vanadate salt anode material, a tetrahedral layer structure is formed by ball milling and sintering processes, which solves the problem of capacity and expansion coefficient of the negative electrode material of lithium-ion battery, and achieves efficient lithium-ion deintercalation and good cycling performance.
Patent Information
- Application Number
- CN202411102061.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2024-12-10
AI Technical Summary
Existing lithium-ion battery anode materials such as graphite and silicon carbon materials have problems with gram capacity and expansion coefficient, resulting in limited application in lithium-ion batteries.
The preparation method of zinc vanadate salt (Na2ZnV2O7) negative electrode material is adopted, and the Zn/V atoms are formed into a tetrahedral layer structure through ball milling and sintering processes, which improves the deintercalation ability of lithium ions, and ensures the pure phase of the material by adjusting the raw material ratio.
It achieves high gram capacity and good cycle performance, while simplifying the preparation process. The raw materials are cheap and easy to obtain, and are suitable for lithium-ion batteries.
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Figure CN119100449A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of battery negative electrode materials, and in particular to a zinc vanadate negative electrode material and a preparation method thereof, and a lithium ion battery. Background Art
[0002] In recent years, as the country has vigorously developed renewable energy such as wind energy, solar energy, and tidal energy, lithium-ion batteries have emerged as a highly efficient energy storage and energy conversion device. Lithium-ion batteries have the characteristics of high energy density, green environmental protection, and safety. Its negative electrode material is generally graphite or silicon-carbon material. Graphite as a negative electrode material has the disadvantages of low gram capacity and first coulomb efficiency. Although silicon-carbon materials have higher gram capacity, their higher expansion coefficient restricts their development. Therefore, it is urgent to find a new type of negative electrode material for lithium-ion batteries. Summary of the invention
[0003] In order to solve the above technical problems, the present application provides a zinc vanadate negative electrode material and a preparation method thereof, and a lithium ion battery.
[0004] In order to achieve the above-mentioned purpose, according to the first aspect of the present technical solution, the present technical solution provides a method for preparing a zinc vanadate negative electrode material.
[0005] According to the method for preparing the zinc vanadate negative electrode material provided in the embodiment of the present application, it comprises:
[0006] ZnO, Na 2 CO 3 and V 2 O 5 Dispersing in an organic solvent and subjecting to ball milling to obtain a first mixed solution;
[0007] Drying the first mixed solution and then cooling it to room temperature to obtain a first powder;
[0008] The first powder is pressed into a sheet and then pre-fired at a first temperature for a first preset time to obtain a first ceramic sheet.
[0009] Furthermore, in the method for preparing the zinc vanadate negative electrode material, the temperature used for drying the first mixed solution is 80° C. and the time is 6 hours.
[0010] Furthermore, in the preparation method of zinc vanadate negative electrode material, the first temperature is 500° C., and the first preset time is 5 hours.
[0011] Furthermore, the method for preparing the zinc vanadate negative electrode material also includes:
[0012] The first ceramic sheet is crushed into powder and then dispersed into an organic solvent, and ball-milled to obtain a second mixed solution;
[0013] Drying the second mixed liquid and then cooling it to room temperature to obtain a second powder;
[0014] The second powder is pressed into a sheet and then sintered at a second temperature for a second preset time to obtain a second ceramic sheet.
[0015] Furthermore, in the method for preparing the zinc vanadate negative electrode material, the temperature used for drying the second mixed solution is 80° C. and the time is 6 hours.
[0016] Furthermore, in the preparation method of zinc vanadate negative electrode material, the second temperature is 600° C., and the second preset time is 5 hours.
[0017] Furthermore, in the preparation method of zinc vanadate negative electrode material, the organic solvent is anhydrous ethanol.
[0018] Furthermore, in the preparation method of zinc vanadate negative electrode material, the ball milling time is 3 hours.
[0019] In order to achieve the above-mentioned purpose, according to the second aspect of the present technical solution, the present technical solution provides a zinc vanadate negative electrode material, which is prepared by the preparation method of the zinc vanadate negative electrode material provided by the first aspect of the present technical solution.
[0020] In order to achieve the above-mentioned purpose, according to the third aspect of the present technical solution, the present technical solution also provides a lithium-ion battery, which includes the zinc vanadate negative electrode material provided by the second aspect of the present technical solution.
[0021] The present invention provides a method for preparing a zinc vanadate negative electrode material, wherein the three raw materials are evenly mixed by ball milling, and a ceramic sheet obtained by sintering contains a reaction product Na 2 ZnV 2 O 7 The Zn / V atoms in the material form Zn / VO with the surrounding O atoms respectively. 4 Tetrahedron, Zn / VO 4 The tetrahedral layers are arranged alternately along the c-axis to form a layered structure, which is beneficial to the deintercalation and extraction of lithium ions. At the same time, the V element in the material has multiple valence states, which makes the material have a higher gram capacity. The negative electrode material prepared by this method shows a higher gram capacity and good cycle performance during electrical testing. It also has the advantages of a simple preparation process and cheap and readily available raw materials. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is the XRD diagram of the zinc vanadate negative electrode material prepared in the embodiment of the present application;
[0023] Figure 2 This is the XRD diagram of the zinc vanadate negative electrode material prepared in the embodiment of the present application;
[0024] Figure 3 This is a SEM / EDS image of the zinc vanadate negative electrode material prepared in the example of the present application;
[0025] Figure 4 The charge and discharge curve of the battery corresponding to the zinc vanadate negative electrode material obtained in the embodiment of the present application at a current density of 50 mA / g;
[0026] Figure 5 This is the cycle performance curve of the battery corresponding to the zinc vanadate negative electrode material obtained in the embodiment of the present application at a current density of 50 mA / g. DETAILED DESCRIPTION
[0027] The present invention discloses a method for preparing a zinc vanadate negative electrode material. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to achieve it. It is particularly important to point out that all similar substitutions and modifications are obvious to those skilled in the art, and they are all deemed to be included in the present invention. The products, processes and applications described in the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the products, processes and applications described herein without departing from the content, spirit and scope of the present invention to realize and apply the technology of the present invention. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0028] It should be noted that, in this document, relational terms such as "first" and "second", "step 1" and "step 2", and "(1)" and "(2)" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.
[0029] Hereinafter, preferred embodiments of the present invention will be described in detail.
[0030] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.
[0031] The preparation method of the zinc vanadate negative electrode material provided in the embodiment of the present application mainly includes the following steps 1-3.
[0032] Step 1: ZnO, Na 2 CO 3 and V 2 O 5 After being dispersed in an organic solvent and subjected to ball milling, a first mixed solution is obtained. In this step, the organic solvent is preferably anhydrous ethanol. During the ball milling process, anhydrous ethanol can be used as a co-solvent to help reduce the concentration of ZnO and Na 2 CO 3 and V 2 O 5 The viscosity of the material can be increased, and the ball milling efficiency can be improved. At the same time, anhydrous ethanol can also reduce the surface energy of the powder surface, which can prevent the material from agglomerating during the grinding process and ensure that the ground material has good dispersibility. The ball milling time in this step is preferably 3 hours.
[0033] Step 2, drying the first mixed solution and cooling it to room temperature to obtain a first powder. In this step, the temperature used for drying the first mixed solution is preferably 80° C. and the time is preferably 6 hours.
[0034] Step 3, pressing the first powder into a sheet and pre-firing the sheet at a first temperature for a first preset time to obtain a first ceramic sheet. In this step, the first temperature is preferably 500° C. and the first preset time is preferably 5 hours.
[0035] In the above embodiment, the preparation method of zinc vanadate negative electrode material adopts ball milling to mix the three raw materials evenly, and the ceramic sheet obtained by sintering contains the reaction product Na 2 ZnV 2 O 7 The Zn / V atoms in the material form Zn / VO with the surrounding O atoms respectively. 4 Tetrahedron, Zn / VO 4The tetrahedral layers are arranged alternately along the c-axis to form a layered structure, which is beneficial to the deintercalation and extraction of lithium ions. At the same time, the V element in the material has multiple valence states, which makes the material have a higher gram capacity. The negative electrode material prepared by this method shows a higher gram capacity and good cycle performance during electrical testing. It also has the advantages of a simple preparation process and cheap and readily available raw materials.
[0036] The technicians found that the first ceramic sheet obtained by the process of steps 1-3 contains a considerable proportion of unreacted raw materials, namely ZnO, Na 2 CO 3 and V 2 O 5 Based on this, in some embodiments, the method for preparing the zinc vanadate negative electrode material further includes steps 4-6.
[0037] Step 4: crush the first ceramic sheet into powder, disperse the powder into an organic solvent, and perform ball milling to obtain a second mixed solution. In this step, the organic solvent is preferably anhydrous ethanol, and the ball milling time is preferably 3 hours.
[0038] Step 5, drying the second mixed solution and cooling it to room temperature to obtain a second powder. In this step, the temperature used for drying the second mixed solution is preferably 80° C. and the time is preferably 6 hours.
[0039] Step 6: Press the second powder into a sheet and then sinter it at a second temperature for a second preset time to obtain a second ceramic sheet. In this step, the second temperature is preferably 600° C. and the second preset time is preferably 5 hours.
[0040] In the above embodiment, after the first ceramic sheet is crushed by steps 4-6, secondary ball milling and secondary sintering are performed, so that the raw materials can be fully mixed and reacted, so that a sufficient content of Na is obtained in the second ceramic sheet. 2 ZnV 2 O 7 Material.
[0041] The embodiment of the present invention also correspondingly protects a zinc vanadate negative electrode material prepared by the method for preparing the zinc vanadate negative electrode material. The zinc vanadate negative electrode material can be used to prepare a lithium ion battery.
[0042] Example 1
[0043] A method for preparing a zinc vanadate negative electrode material comprises the following steps.
[0044] Step 1: 0.02 mol of ZnO and 0.02 mol of Na 2 CO 3and 0.02 mol V 2 O 5 The mixture was dispersed in a ball mill filled with anhydrous ethanol and subjected to ball milling for 3 hours to obtain a first mixed solution.
[0045] Step 2, transfer the first mixed solution after ball milling into three 50 ml beakers respectively, mark them, put them into a drying oven, dry them at 80°C in an air atmosphere for 6 hours, take out all the beakers after cooling to room temperature, and scrape out all the powder samples in the beakers with a medicine spoon.
[0046] Step 3, pour the powder sample obtained in step 2 into a tablet press mold, use a tablet press to press it into tablets at a pressure of 5 MPa for 20 seconds, load the pressed samples into alumina crucibles, put them into a muffle furnace and pre-burn them at 500°C for 5 hours to obtain ceramic sheet samples, wherein the heating rate of the muffle furnace is 5°C / min.
[0047] Step 4, crush the ceramic sheet samples obtained by pre-sintering in step 3 into powders, dissolve them in anhydrous ethanol, and continue ball milling for 3 hours to obtain a second mixed solution.
[0048] Step 5, transfer the second mixed solution after ball milling into three 50 ml beakers respectively, mark them, put them into a drying oven, dry them at 80°C in an air atmosphere for 6 hours, take out all the beakers after cooling to room temperature, and scrape out all the powder samples in the beakers with a medicine spoon.
[0049] Step 6, pour the powder sample obtained in step 5 into a tablet press mold, press the powder into tablets according to the conditions in step 3, load the pressed tablets into alumina crucibles, put them into a muffle furnace and sinter them at 600°C for 5 hours to obtain ceramic sheet samples, crush the ceramic sheet samples in an agate mortar, grind them into powder for later use, which is the zinc vanadate negative electrode material.
[0050] The zinc vanadate negative electrode material finally obtained in Example 1 was mixed evenly with the conductive agent SP and the binder PVDF in a mass ratio of 7:2:1. The mixture was ground into a uniform black slurry in an agate mortar, and then coated evenly on the copper foil using a coater, and vacuum dried at 90°C for 3 hours. The dried electrode was compacted using a roller press, and punched into small discs of 12 mm using a punching machine. The mass of the zinc vanadate negative electrode material was recorded, and the small discs were packed in a sealed bag and moved into a glove box. The half-cell was assembled in the glove box, using a lithium sheet as the counter electrode and a diaphragm of PE material. The half-cell performance test was carried out with a test current of 50mAh / g and a voltage window of 0.1-2.5V. The first charging capacity was tested to be nearly 370mAh / g. After 50 cycles of charge and discharge, the battery charging capacity was less than 200mAh / g, and the capacity retention rate was about 50%. Compared with the use of Na 2 ZnV2 O 7 There is a certain deviation in the results of the above tests on material standards.
[0051] In order to analyze the reasons for the above deviations, the XRD pattern of the zinc vanadate negative electrode material obtained in Example 1 was tested. Figure 1 The corresponding raw materials ZnO and Na 2 CO 3 and V 2 O 5 The ratio of the amount of substance of the three is 1:1:1. Figure 1 It can be seen from the corresponding spectrum that the main diffraction peaks of the zinc vanadate anode material obtained in Example 1 are consistent with the standard comparison card (Na 2 ZnV 2 O 7 ), indicating that Na 2 ZnV 2 O 7 , but it shows the appearance of ZnO secondary crystal phase, indicating that ZnO, Na 2 CO 3 and V 2 O 5 The reaction was not completed according to the added amount, and there was an excess of Zn in the raw material. The technicians analyzed that the reason may be that in the preparation process of the zinc vanadate negative electrode material in Example 1, it went through two high-temperature sintering processes, which would cause a certain amount of volatilization of the V element, resulting in the ZnO and Na 2 CO 3 and V 2 O 5 The imbalance of the three makes the obtained zinc vanadate anode material not Na 2 ZnV 2 O 7 Pure phase.
[0052] Based on this, the following Example 2 is set to conduct relevant research.
[0053] Example 2
[0054] A method for preparing a zinc vanadate negative electrode material comprises the following steps.
[0055] Step 1: 0.02 mol of ZnO and 0.02 mol of Na 2 CO 3 and 0.022 mol of V 2 O 5 The mixture was dispersed in a ball mill filled with anhydrous ethanol and subjected to ball milling for 3 hours to obtain a first mixed solution.
[0056] Step 2, transfer the first mixed solution after ball milling into three 50 ml beakers respectively, mark them, put them into a drying oven, dry them at 80°C in an air atmosphere for 6 hours, take out all the beakers after cooling to room temperature, and scrape out all the powder samples in the beakers with a medicine spoon.
[0057] Step 3, pour the powder sample obtained in step 2 into a tablet press mold, use a tablet press to press it into tablets at a pressure of 5 MPa for 20 seconds, load the pressed samples into alumina crucibles, put them into a muffle furnace and pre-burn them at 500°C for 5 hours to obtain ceramic sheet samples, wherein the heating rate of the muffle furnace is 5°C / min.
[0058] Step 4, crush the ceramic sheet samples obtained by pre-sintering in step 3 into powders, dissolve them in anhydrous ethanol, and continue ball milling for 3 hours to obtain a second mixed solution.
[0059] Step 5, transfer the second mixed solution after ball milling into three 50 ml beakers respectively, mark them, put them into a drying oven, dry them at 80°C in an air atmosphere for 6 hours, take out all the beakers after cooling to room temperature, and scrape out all the powder samples in the beakers with a medicine spoon.
[0060] Step 6, pour the powder sample obtained in step 5 into a tablet press mold, press the powder into tablets according to the conditions in step 3, load the pressed tablets into alumina crucibles, put them into a muffle furnace and sinter them at 600°C for 5 hours to obtain ceramic sheet samples, crush the ceramic sheet samples in an agate mortar, grind them into powder for later use, which is the zinc vanadate negative electrode material.
[0061] The zinc vanadate negative electrode material finally obtained in Example 2 was mixed evenly with the conductive agent SP and the binder PVDF, the mass ratio of the three being 7:2:1, the mixture was ground into a uniform black slurry in an agate mortar, and then evenly coated on the copper foil using a coater, and vacuum dried at 90°C for 3h. The dried pole piece was compacted using a roller press, and punched into a 12mm small disc using a punching machine, and the mass of the zinc vanadate negative electrode material was recorded. The small disc was packed in a sealed bag and moved into a glove box. The half-cell was assembled in the glove box, using a lithium sheet as the counter electrode and a diaphragm of PE material. The half-cell performance test was carried out, the test current was 50mAh / g, and the voltage window was 0.1-2.5V. The first charge capacity was tested to be about 360mAh / g, and the battery charge capacity was about 197mAh / g after 50 cycles of charge and discharge, and the capacity retention rate was about 55%. Compared with Example 1, the battery performance has not been significantly improved.
[0062] The XRD pattern of the zinc vanadate negative electrode material obtained in Test Example 2 is as follows: Figure 1 The corresponding raw materials ZnO and Na 2CO 3 and V 2 O 5 The ratio of the amount of substance of the three is 1:1:1.1. Figure 1 It can be seen from the corresponding spectrum that the main diffraction peaks of the zinc vanadate negative electrode material obtained in Example 2 are consistent with the standard comparison card (Na 2 ZnV 2 O 7 ), indicating that Na 2 ZnV 2 O 7 , but it shows Na 2 VO 3 The appearance of the secondary crystal phase indicates that ZnO, Na 2 CO 3 and V 2 O 5 The reaction was not completely completed according to the added amount, and there was an excess of V element in the raw material.
[0063] In this embodiment, in order to compensate for the volatilization of V element caused by the two high-temperature sintering processes in the preparation of zinc vanadate negative electrode materials, an excess of V 2 O 5 , but the results show that ZnO and Na 2 CO 3 and V 2 O 5 The imbalance of the three makes the obtained zinc vanadate anode material still not Na 2 ZnV 2 O 7 Pure phase.
[0064] Example 3
[0065] A method for preparing a zinc vanadate negative electrode material comprises the following steps.
[0066] Step 1: 0.02 mol of ZnO and 0.02 mol of Na 2 CO 3 and 0.021 mol of V 2 O 5 The mixture was dispersed in a ball mill filled with anhydrous ethanol and subjected to ball milling for 3 hours to obtain a first mixed solution.
[0067] Step 2, transfer the first mixed solution after ball milling into three 50 ml beakers respectively, mark them, put them into a drying oven, dry them at 80°C in an air atmosphere for 6 hours, take out all the beakers after cooling to room temperature, and scrape out all the powder samples in the beakers with a medicine spoon.
[0068] Step 3, pour the powder sample obtained in step 2 into a tablet press mold, use a tablet press to press it into tablets at a pressure of 5 MPa for 20 seconds, load the pressed samples into alumina crucibles, put them into a muffle furnace and pre-burn them at 500°C for 5 hours to obtain ceramic sheet samples, wherein the heating rate of the muffle furnace is 5°C / min.
[0069] Step 4, crush the ceramic sheet samples obtained by pre-sintering in step 3 into powders, dissolve them in anhydrous ethanol, and continue ball milling for 3 hours to obtain a second mixed solution.
[0070] Step 5, transfer the second mixed solution after ball milling into three 50 ml beakers respectively, mark them, put them into a drying oven, dry them at 80°C in an air atmosphere for 6 hours, take out all the beakers after cooling to room temperature, and scrape out all the powder samples in the beakers with a medicine spoon.
[0071] Step 6, pour the powder sample obtained in step 5 into a tablet press mold, press the powder into tablets according to the conditions in step 3, load the pressed tablets into alumina crucibles, put them into a muffle furnace and sinter them at 600°C for 5 hours to obtain ceramic sheet samples, crush the ceramic sheet samples in an agate mortar, grind them into powder for later use, which is the zinc vanadate negative electrode material.
[0072] The XRD pattern of the zinc vanadate negative electrode material obtained in Test Example 3 is as follows: Figure 1 The corresponding raw materials ZnO and Na 2 CO 3 and V 2 O 5 The ratio of the amount of substance of the three is 1:1:1.05. Figure 1 It can be seen from the corresponding spectrum that the main diffraction peaks of the zinc vanadate anode material obtained in Example 3 are consistent with the standard comparison card (Na 2 ZnV 2 O 7 ), indicating that Na 2 ZnV 2 O 7 , and no secondary crystal phase appears, indicating that ZnO, Na 2 CO 3 and V 2 O 5 The reaction was completed according to the added ratio and Na 2 ZnV 2 O 7 The pure phase.
[0073] like Figure 3As shown, the SEM / EDS image of the zinc vanadate negative electrode material prepared in Example 3 of the present invention is given, and it can be seen that the elements Na, Zn, and V are evenly distributed in the material.
[0074] The zinc vanadate negative electrode material finally obtained in Example 3 is evenly mixed with the conductive agent SP and the binder PVDF in a mass ratio of 7:2:1. The mixture is ground into a uniform black slurry in an agate mortar, and then coated evenly on the copper foil using a coater, and vacuum dried at 90°C for 3 hours. The dried electrode is compacted using a roller press, and punched into small discs of 12 mm using a punching machine. The mass of the active substance is recorded, and the small discs are packed in a sealed bag and moved into a glove box. A half-cell is assembled in the glove box, using a lithium sheet as the counter electrode and a diaphragm of PE material. The half-cell performance test is carried out with a test current of 50mAh / g and a voltage window of 0.1-2.5V. The charge and discharge curves of the zinc vanadate negative electrode material obtained in Example 3 at a current density of 50mA / g are as follows: Figure 4 As shown, Na 2 ZnV 2 O 7 The first charge and discharge curve of the pure phase shows that the first charge capacity of the material can reach 390 mAh / g when the current density is 50 mAh / g. The cycle performance curve of the zinc vanadate negative electrode material obtained in Example 3 at a current density of 50 mA / g is shown in FIG. Figure 5 As shown by Figure 5 It can be seen that when the current density of this material is 50mAh / g, the battery charging capacity is 277mAh / g after 50 cycles of charge and discharge, and the capacity retention rate can reach 71%.
[0075] It can be found from the above examples that when the obtained zinc vanadate negative electrode material is Na 2 ZnV 2 O 7 Pure phase or close to Na 2 ZnV 2 O 7 Based on this rule and discovery, technicians further sought to make the zinc vanadate anode material Na 2 ZnV 2 O 7 Pure phase or close to Na 2 ZnV 2 O 7 The preparation process parameters of the pure phase are as follows: under the process conditions of Example 3 of the present invention, ZnO, Na 2 CO 3 and V 2 O 5When the molar ratio of the three is 1:1:(1.027-1.073), the XRD pattern of the obtained zinc vanadate anode material is as follows: Figure 2 The main diffraction peaks of the obtained zinc vanadate anode material are compared with the standard comparison card (Na 2 ZnV 2 O 7 ), indicating that Na 2 ZnV 2 O 7 , and no secondary crystal phase appears, indicating that ZnO, Na 2 CO 3 and V 2 O 5 The above ratio was used for complete reaction, and the Na 2 ZnV 2 O 7 The pure phase is within the detection error accuracy range of the XRD instrument, making the zinc vanadate anode material Na 2 ZnV 2 O 7 Pure phase or close to Na 2 ZnV 2 O 7 Pure phase.
[0076] Some embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referenced to each other.
[0077] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A method for preparing a zinc vanadate negative electrode material, It is characterized in that include: ZnO, Na 2 CO 3 and V 2 O 5 Dispersing in an organic solvent and subjecting to ball milling to obtain a first mixed solution; Drying the first mixed solution and then cooling it to room temperature to obtain a first powder; The first powder is pressed into a sheet and then pre-fired at a first temperature for a first preset time to obtain a first ceramic sheet.
2. The method for preparing the zinc vanadate negative electrode material according to claim 1, It is characterized in that The temperature used for drying the first mixed liquid is 80° C. and the time is 6 hours.
3. The method for preparing the zinc vanadate negative electrode material according to claim 1, It is characterized in that The first temperature is 500° C., and the first preset time is 5 hours.
4. The method for preparing the zinc vanadate negative electrode material according to claim 1, It is characterized in that Also includes: The first ceramic sheet is crushed into powder and then dispersed into an organic solvent, and ball-milled to obtain a second mixed solution; Drying the second mixed liquid and then cooling it to room temperature to obtain a second powder; The second powder is pressed into a sheet and then sintered at a second temperature for a second preset time to obtain a second ceramic sheet.
5. The method for preparing the zinc vanadate negative electrode material according to claim 4, It is characterized in that The temperature used for drying the second mixed liquid is 80° C. and the time is 6 hours.
6. The method for preparing the zinc vanadate negative electrode material according to claim 4, It is characterized in that The second temperature is 600° C., and the second preset time is 5 hours.
7. The method for preparing the zinc vanadate negative electrode material according to claim 1 or 4, It is characterized in that The organic solvent is anhydrous ethanol.
8. The method for preparing the zinc vanadate negative electrode material according to claim 1 or 4, It is characterized in that The ball milling time was 3 h.
9. A zinc vanadate negative electrode material, It is characterized in that The zinc vanadate negative electrode material is prepared by the preparation method of the zinc vanadate negative electrode material according to any one of claims 1 to 8.
10. A lithium ion battery, It is characterized in that Comprising the zinc vanadate negative electrode material as described in claim 9.