Sodium ion battery manufacturing process

Abstract

The invention discloses a sodium ion battery manufacturing process, and particularly relates to the field of battery manufacturing, and the sodium ion battery manufacturing process comprises the following steps: S1, weighing a certain amount of sodium oxalate, manganese oxide and magnesium oxide, adding sodium oxalate, manganese oxide and magnesium oxide into a grinding machine for grinding, then putting into a heating furnace for primary calcination, cooling at room temperature, and then grinding again to obtain a sodium oxalate-magnesium oxide precursor; and then putting the mixture into a heating furnace for secondary calcination to obtain the sodium ion battery positive electrode material. S2, selecting poplar wood chips, putting the poplar wood chips into a heating furnace for carbonization treatment, uniformly mixing the poplar wood chips with sodium oxalate, and then putting the mixture into the heating furnace for heating to obtain the sodium ion battery negative electrode material; and S3, sodium hexafluorophosphate is dissolved in dimethyl carbonate, vinylene carbonate is added, stirring is conducted, and the electrolyte is obtained. The sodium storage capacity and the structural stability of the negative electrode material are improved, the overall performance of the battery is improved, the internal resistance of the battery is reduced, and the charge-discharge efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of battery manufacturing, and more particularly to a sodium ion battery manufacturing process. Background Art

[0002] In recent years, sodium-ion batteries, which share similar operating principles to lithium-ion batteries, have garnered significant attention from both scientific research and industry due to their abundant sodium resources, widespread distribution, low cost, excellent overall performance, and compatibility with existing lithium-ion battery production equipment. Furthermore, research has shown that sodium-ion batteries offer superior power characteristics, wide temperature range adaptability, high safety, and freedom from overdischarge. These advantages have led to increasing interest in sodium-ion batteries, which are expected to rapidly develop in a variety of fields, including large-scale energy storage, micro-electric vehicles, hybrid power, agricultural machinery, electric boats, communication base stations, home / industrial energy storage, and smart grids.

[0003] At present, there are still some problems in the manufacturing process of sodium-ion batteries, such as the complex preparation process of electrode materials and unstable charging and discharging performance of the battery, which is not conducive to the production of sodium-ion batteries and will affect the service life of sodium-ion batteries.

[0004] In order to solve the above problems, a technical solution is now provided. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a sodium ion battery manufacturing process to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A sodium ion battery manufacturing process comprises the following steps: Step S1, weighing a certain amount of sodium oxalate, manganese oxide, and magnesium oxide, adding the sodium oxalate, manganese oxide, and magnesium oxide into a grinder for grinding, then placing them into a heating furnace for primary calcination, cooling them to room temperature, grinding them again, and then placing them into a heating furnace for secondary calcination to obtain a sodium ion battery positive electrode material; Step S2: selecting poplar sawdust, placing it in a heating furnace for carbonization treatment, uniformly mixing the poplar sawdust with sodium oxalate, and then placing it in a heating furnace for heating to obtain a sodium ion battery negative electrode material; Step S3, dissolving sodium hexafluorophosphate in dimethyl carbonate, adding vinylene carbonate and stirring to obtain an electrolyte; Step S4, adding graphene, polyvinylidene fluoride and dimethylformamide to the positive electrode material of the sodium ion battery, stirring evenly to obtain a positive electrode slurry, and adding graphene, polyvinylidene fluoride and dimethylformamide to the negative electrode material of the sodium ion battery, stirring evenly to obtain a negative electrode slurry; Step S5, coating the positive electrode slurry and the negative electrode slurry on aluminum foil and copper foil respectively to form positive electrode sheets and negative electrode sheets respectively; Step S6: stacking the positive electrode sheet, the separator, and the negative electrode sheet in sequence into a battery case, injecting electrolyte, and sealing the battery case to complete the assembly of the sodium ion battery; Step S7: performing charge and discharge activation treatment on the assembled battery, and then performing performance testing.

[0007] In a preferred embodiment, in step S1, the rotation speed of the grinder is set to 300-400 r / min and the grinding time is set to 4-6 h during the first grinding, and the rotation speed of the grinder is set to 100-200 r / min and the grinding time is set to 1-2 h during the second grinding.

[0008] In a preferred embodiment, in step S1, the first heating temperature is set to 600-800°C, the heating time is set to 8-10 hours, the second heating temperature is set to 300-400°C, and the heating time is set to 4-5 hours.

[0009] In a preferred embodiment, in step S2, the temperature of the carbonization treatment is set to 500-600°C, and the time of the carbonization treatment is set to 2-3 hours.

[0010] In a preferred embodiment, in step S2, the poplar sawdust and sodium oxalate are uniformly mixed and then placed in a heating furnace. The temperature in the heating furnace is set to 260-320° C., and the heating time is set to 60-120 minutes.

[0011] In a preferred embodiment, in step S3, a stirrer is used for stirring. When preparing the positive electrode slurry, the stirrer speed is set to 420-480 r / min, and the stirring time is set to 40-60 min. When preparing the negative electrode slurry, the stirrer speed is set to 340-380 r / min, and the stirring time is set to 20-30 min.

[0012] In a preferred embodiment, in step S5, the thickness of the aluminum foil is set to 15-30 μm, the thickness of the copper foil is set to 6-12 μm, the coating thickness of the positive electrode slurry is set to 80-150 μm, and the coating thickness of the negative electrode slurry is set to 60-120 μm.

[0013] In a preferred embodiment, in step S7, the detection includes charge and discharge capacity and charge and discharge efficiency.

[0014] The technical effects and advantages of the sodium ion battery manufacturing process of the present invention are as follows: 1. The combination of two grinding and two calcining processes can promote the thorough mixing and reaction of sodium oxalate, manganese oxide, and magnesium oxide, improve the material's crystallinity and microstructure, facilitate the insertion and extraction of sodium ions, enhance the electrochemical performance of the positive electrode material, and thus improve the battery's charge and discharge capacity and stability. Carbonization treatment can form a suitable carbon structure, which subsequently reacts with sodium oxalate to optimize material performance, provide more storage sites for sodium ions, and enhance the sodium storage capacity and structural stability of the negative electrode material, which is beneficial to improving the overall performance of the battery. 2. It can ensure that the electrode has good conductivity, mechanical strength and ion transmission performance, reduce the internal resistance of the battery and improve the charging and discharging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a schematic flow chart of a sodium ion battery manufacturing process. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0017] Figure 1 The present invention provides a sodium ion battery manufacturing process, which specifically includes the following steps: Step S1, weighing a certain amount of sodium oxalate, manganese oxide, and magnesium oxide, adding the sodium oxalate, manganese oxide, and magnesium oxide into a grinder for grinding, then placing them into a heating furnace for primary calcination, cooling them to room temperature, grinding them again, and then placing them into a heating furnace for secondary calcination to obtain a sodium ion battery positive electrode material; Step S2: selecting poplar sawdust, placing it in a heating furnace for carbonization treatment, uniformly mixing the poplar sawdust with sodium oxalate, and then placing it in a heating furnace for heating to obtain a sodium ion battery negative electrode material; Step S3, dissolving sodium hexafluorophosphate in dimethyl carbonate, adding vinylene carbonate and stirring to obtain an electrolyte; Step S4, adding graphene, polyvinylidene fluoride and dimethylformamide to the positive electrode material of the sodium ion battery, stirring evenly to obtain a positive electrode slurry, and adding graphene, polyvinylidene fluoride and dimethylformamide to the negative electrode material of the sodium ion battery, stirring evenly to obtain a negative electrode slurry; Step S5, coating the positive electrode slurry and the negative electrode slurry on aluminum foil and copper foil respectively to form positive electrode sheets and negative electrode sheets respectively; Step S6: stacking the positive electrode sheet, the separator, and the negative electrode sheet in sequence into a battery case, injecting electrolyte, and sealing the battery case to complete the assembly of the sodium ion battery; Step S7: performing charge and discharge activation treatment on the assembled battery, and then performing performance testing.

[0018] In step S1, the speed of the grinder is set to 300r / min and the grinding time is set to 4h during the first grinding. The speed of the grinder is set to 100r / min and the grinding time is set to 1h during the second grinding. In step S1, the first heating temperature is set to 600℃ and the heating time is set to 8h. The second heating temperature is set to 300℃ and the heating time is set to 4h. In step S2, the temperature of the carbonization treatment is set to 500℃ and the carbonization treatment time is set to 2h. In step S2, the poplar sawdust and sodium oxalate are evenly mixed and placed in a heating furnace. In step S3, the temperature in the heating furnace is set to 260°C, and the heating time is set to 60 min. In step S4, a stirrer is used for stirring. When preparing the positive electrode slurry, the speed of the stirrer is set to 420 r / min, and the stirring time is set to 40 min. When preparing the negative electrode slurry, the speed of the stirrer is set to 340 r / min, and the stirring time is set to 20 min. In step S5, the thickness of the aluminum foil is set to 15 μm, the thickness of the copper foil is set to 6 μm, the coating thickness of the positive electrode slurry is set to 80 μm, and the coating thickness of the negative electrode slurry is set to 60 μm. Example

[0019] Figure 1 The present invention provides a sodium ion battery manufacturing process, which specifically includes the following steps: Step S1, weighing a certain amount of sodium oxalate, manganese oxide, and magnesium oxide, adding the sodium oxalate, manganese oxide, and magnesium oxide into a grinder for grinding, then placing them into a heating furnace for primary calcination, cooling them to room temperature, grinding them again, and then placing them into a heating furnace for secondary calcination to obtain a sodium ion battery positive electrode material; Step S2: selecting poplar sawdust, placing it in a heating furnace for carbonization treatment, uniformly mixing the poplar sawdust with sodium oxalate, and then placing it in a heating furnace for heating to obtain a sodium ion battery negative electrode material; Step S3, dissolving sodium hexafluorophosphate in dimethyl carbonate, adding vinylene carbonate and stirring to obtain an electrolyte; Step S4, adding graphene, polyvinylidene fluoride and dimethylformamide to the positive electrode material of the sodium ion battery, stirring evenly to obtain a positive electrode slurry, and adding graphene, polyvinylidene fluoride and dimethylformamide to the negative electrode material of the sodium ion battery, stirring evenly to obtain a negative electrode slurry; Step S5, coating the positive electrode slurry and the negative electrode slurry on aluminum foil and copper foil respectively to form positive electrode sheets and negative electrode sheets respectively; Step S6: stacking the positive electrode sheet, the separator, and the negative electrode sheet in sequence into a battery case, injecting electrolyte, and sealing the battery case to complete the assembly of the sodium ion battery; Step S7: performing charge and discharge activation treatment on the assembled battery, and then performing performance testing.

[0020] In step S1, the speed of the grinder is set to 320r / min and the grinding time is set to 4h during the first grinding. The speed of the grinder is set to 120r / min and the grinding time is set to 1h during the second grinding. In step S1, the first heating temperature is set to 620℃ and the heating time is set to 8h. The second heating temperature is set to 320℃ and the heating time is set to 4h. In step S2, the temperature of the carbonization treatment is set to 520℃ and the carbonization treatment time is set to 2h. In step S2, the poplar sawdust and sodium oxalate are evenly mixed and placed in a heating furnace. In step S3, the temperature in the heating furnace is set to 270°C, and the heating time is set to 80 min. In step S4, a stirrer is used for stirring. When preparing the positive electrode slurry, the stirrer speed is set to 440 r / min, and the stirring time is set to 45 min. When preparing the negative electrode slurry, the stirrer speed is set to 350 r / min, and the stirring time is set to 22 min. In step S5, the thickness of the aluminum foil is set to 16 μm, the thickness of the copper foil is set to 8 μm, the coating thickness of the positive electrode slurry is set to 90 μm, and the coating thickness of the negative electrode slurry is set to 80 μm. Example

[0021] Figure 1 The present invention provides a sodium ion battery manufacturing process, which specifically includes the following steps: Step S1, weighing a certain amount of sodium oxalate, manganese oxide, and magnesium oxide, adding the sodium oxalate, manganese oxide, and magnesium oxide into a grinder for grinding, then placing them into a heating furnace for primary calcination, cooling them to room temperature, grinding them again, and then placing them into a heating furnace for secondary calcination to obtain a sodium ion battery positive electrode material; Step S2: selecting poplar sawdust, placing it in a heating furnace for carbonization treatment, uniformly mixing the poplar sawdust with sodium oxalate, and then placing it in a heating furnace for heating to obtain a sodium ion battery negative electrode material; Step S3, dissolving sodium hexafluorophosphate in dimethyl carbonate, adding vinylene carbonate and stirring to obtain an electrolyte; Step S4, adding graphene, polyvinylidene fluoride and dimethylformamide to the positive electrode material of the sodium ion battery, stirring evenly to obtain a positive electrode slurry, and adding graphene, polyvinylidene fluoride and dimethylformamide to the negative electrode material of the sodium ion battery, stirring evenly to obtain a negative electrode slurry; Step S5, coating the positive electrode slurry and the negative electrode slurry on aluminum foil and copper foil respectively to form positive electrode sheets and negative electrode sheets respectively; Step S6: stacking the positive electrode sheet, the separator, and the negative electrode sheet in sequence into a battery case, injecting electrolyte, and sealing the battery case to complete the assembly of the sodium ion battery; Step S7: performing charge and discharge activation treatment on the assembled battery, and then performing performance testing.

[0022] In step S1, the speed of the grinder is set to 350r / min and the grinding time is set to 5h during the first grinding. The speed of the grinder is set to 150r / min and the grinding time is set to 1h during the second grinding. In step S1, the first heating temperature is set to 700℃ and the heating time is set to 9h. The second heating temperature is set to 350℃ and the heating time is set to 4h. In step S2, the temperature of the carbonization treatment is set to 550℃ and the carbonization treatment time is set to 2h. In step S2, the poplar sawdust and sodium oxalate are evenly mixed and placed in a heating furnace. The temperature in the heating furnace is set to 290°C, and the heating time is set to 90 minutes. In step S3, a stirrer is used for stirring. When preparing the positive electrode slurry, the stirrer speed is set to 450 r / min, and the stirring time is set to 50 minutes. When preparing the negative electrode slurry, the stirrer speed is set to 360 r / min, and the stirring time is set to 25 minutes. In step S5, the thickness of the aluminum foil is set to 20 μm, the thickness of the copper foil is set to 10 μm, the coating thickness of the positive electrode slurry is set to 100 μm, and the coating thickness of the negative electrode slurry is set to 90 μm. Example

[0023] Figure 1 The present invention provides a sodium ion battery manufacturing process, which specifically includes the following steps: Step S1, weighing a certain amount of sodium oxalate, manganese oxide, and magnesium oxide, adding the sodium oxalate, manganese oxide, and magnesium oxide into a grinder for grinding, then placing them into a heating furnace for primary calcination, cooling them to room temperature, grinding them again, and then placing them into a heating furnace for secondary calcination to obtain a sodium ion battery positive electrode material; Step S2: selecting poplar sawdust, placing it in a heating furnace for carbonization treatment, uniformly mixing the poplar sawdust with sodium oxalate, and then placing it in a heating furnace for heating to obtain a sodium ion battery negative electrode material; Step S3, dissolving sodium hexafluorophosphate in dimethyl carbonate, adding vinylene carbonate and stirring to obtain an electrolyte; Step S4, adding graphene, polyvinylidene fluoride and dimethylformamide to the positive electrode material of the sodium ion battery, stirring evenly to obtain a positive electrode slurry, and adding graphene, polyvinylidene fluoride and dimethylformamide to the negative electrode material of the sodium ion battery, stirring evenly to obtain a negative electrode slurry; Step S5, coating the positive electrode slurry and the negative electrode slurry on aluminum foil and copper foil respectively to form positive electrode sheets and negative electrode sheets respectively; Step S6: stacking the positive electrode sheet, the separator, and the negative electrode sheet in sequence into a battery case, injecting electrolyte, and sealing the battery case to complete the assembly of the sodium ion battery; Step S7: performing charge and discharge activation treatment on the assembled battery, and then performing performance testing.

[0024] In step S1, the speed of the grinder is set to 380r / min and the grinding time is set to 5h during the first grinding, and the speed of the grinder is set to 180r / min and the grinding time is set to 1h during the second grinding. In step S1, the first heating temperature is set to 750℃ and the heating time is set to 9h, and the second heating temperature is set to 380℃ and the heating time is set to 5h. In step S2, the temperature of the carbonization treatment is set to 580℃ and the carbonization treatment time is set to 3h. In step S2, the poplar sawdust and sodium oxalate are evenly mixed and then placed in a heating furnace. The temperature in the heating furnace is set to 300°C, and the heating time is set to 100 min. In step S3, a stirrer is used for stirring. When preparing the positive electrode slurry, the stirrer speed is set to 460 r / min, and the stirring time is set to 55 min. When preparing the negative electrode slurry, the stirrer speed is set to 375 r / min, and the stirring time is set to 28 min. In step S5, the aluminum foil thickness is set to 25 μm, the copper foil thickness is set to 10 μm, the coating thickness of the positive electrode slurry is set to 130 μm, and the coating thickness of the negative electrode slurry is set to 110 μm. Example

[0025] Figure 1 The present invention provides a sodium ion battery manufacturing process, which specifically includes the following steps: Step S1, weighing a certain amount of sodium oxalate, manganese oxide, and magnesium oxide, adding the sodium oxalate, manganese oxide, and magnesium oxide into a grinder for grinding, then placing them into a heating furnace for primary calcination, cooling them to room temperature, grinding them again, and then placing them into a heating furnace for secondary calcination to obtain a sodium ion battery positive electrode material; Step S2: selecting poplar sawdust, placing it in a heating furnace for carbonization treatment, uniformly mixing the poplar sawdust with sodium oxalate, and then placing it in a heating furnace for heating to obtain a sodium ion battery negative electrode material; Step S3, dissolving sodium hexafluorophosphate in dimethyl carbonate, adding vinylene carbonate and stirring to obtain an electrolyte; Step S4, adding graphene, polyvinylidene fluoride and dimethylformamide to the positive electrode material of the sodium ion battery, stirring evenly to obtain a positive electrode slurry, and adding graphene, polyvinylidene fluoride and dimethylformamide to the negative electrode material of the sodium ion battery, stirring evenly to obtain a negative electrode slurry; Step S5, coating the positive electrode slurry and the negative electrode slurry on aluminum foil and copper foil respectively to form positive electrode sheets and negative electrode sheets respectively; Step S6: stacking the positive electrode sheet, the separator, and the negative electrode sheet in sequence into a battery case, injecting electrolyte, and sealing the battery case to complete the assembly of the sodium ion battery; Step S7: performing charge and discharge activation treatment on the assembled battery, and then performing performance testing.

[0026] In step S1, the speed of the grinder is set to 400r / min and the grinding time is set to 6h during the first grinding. The speed of the grinder is set to 200r / min and the grinding time is set to 2h during the second grinding. In step S1, the first heating temperature is set to 800℃ and the heating time is set to 10h. The second heating temperature is set to 400℃ and the heating time is set to 5h. In step S2, the temperature of the carbonization treatment is set to 600℃ and the carbonization treatment time is set to 3h. In step S2, the poplar sawdust and sodium oxalate are evenly mixed and placed in a heating furnace. The temperature in the heating furnace is set to 320°C, and the heating time is set to 120 min. In step S3, a stirrer is used for stirring. When preparing the positive electrode slurry, the stirrer speed is set to 480 r / min, and the stirring time is set to 60 min. When preparing the negative electrode slurry, the stirrer speed is set to 380 r / min, and the stirring time is set to 30 min. In step S5, the thickness of the aluminum foil is set to 30 μm, the thickness of the copper foil is set to 12 μm, the coating thickness of the positive electrode slurry is set to 150 μm, and the coating thickness of the negative electrode slurry is set to 120 μm.

[0027] The charge and discharge capacity and charge and discharge efficiency of the sodium ion batteries obtained in Examples 1 to 5 were tested, and the test results are shown in the following table:

[0028] It can be clearly seen from the above content that the charge and discharge capacity and charge and discharge efficiency of the prepared sodium ion battery are significantly improved, and Example 4 is the best example.

[0029] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0030] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sodium ion battery manufacturing process, characterized in that: The steps include: Step S1, weighing a certain amount of sodium oxalate, manganese oxide, and magnesium oxide, adding the sodium oxalate, manganese oxide, and magnesium oxide into a grinder for grinding, then placing them into a heating furnace for primary calcination, cooling them to room temperature, grinding them again, and then placing them into a heating furnace for secondary calcination to obtain a sodium ion battery positive electrode material; Step S2: selecting poplar sawdust, placing it in a heating furnace for carbonization treatment, uniformly mixing the poplar sawdust with sodium oxalate, and then placing it in a heating furnace for heating to obtain a sodium ion battery negative electrode material; Step S3, dissolving sodium hexafluorophosphate in dimethyl carbonate, adding vinylene carbonate and stirring to obtain an electrolyte; Step S4, adding graphene, polyvinylidene fluoride and dimethylformamide to the positive electrode material of the sodium ion battery, stirring evenly to obtain a positive electrode slurry, and adding graphene, polyvinylidene fluoride and dimethylformamide to the negative electrode material of the sodium ion battery, stirring evenly to obtain a negative electrode slurry; Step S5, coating the positive electrode slurry and the negative electrode slurry on aluminum foil and copper foil respectively to form positive electrode sheets and negative electrode sheets respectively; Step S6: stacking the positive electrode sheet, the separator, and the negative electrode sheet in sequence into a battery case, injecting electrolyte, and sealing the battery case to complete the assembly of the sodium ion battery; Step S7: performing charge and discharge activation treatment on the assembled battery, and then performing performance testing.

2. A sodium ion battery manufacturing process according to claim 1, characterized in that: In step S1, the rotation speed of the grinder is set to 300-400 r / min and the grinding time is set to 4-6 hours during the first grinding, and the rotation speed of the grinder is set to 100-200 r / min and the grinding time is set to 1-2 hours during the second grinding.

3. A sodium ion battery manufacturing process according to claim 1, characterized in that: In step S1, the primary heating temperature is set to 600-800°C, the heating time is set to 8-10 hours, the secondary heating temperature is set to 300-400°C, and the heating time is set to 4-5 hours.

4. A sodium ion battery manufacturing process according to claim 1, characterized in that: In step S2, the temperature of the carbonization treatment is set to 500-600°C, and the time of the carbonization treatment is set to 2-3 hours.

5. A sodium ion battery manufacturing process according to claim 1, characterized in that: In step S2, the poplar sawdust and sodium oxalate are uniformly mixed and then placed in a heating furnace. The temperature in the heating furnace is set to 260-320° C., and the heating time is set to 60-120 minutes.

6. A sodium ion battery manufacturing process according to claim 1, characterized in that: In step S3, a stirrer is used for stirring. When preparing the positive electrode slurry, the stirrer speed is set to 420-480 r / min and the stirring time is set to 40-60 min. When preparing the negative electrode slurry, the stirrer speed is set to 340-380 r / min and the stirring time is set to 20-30 min.

7. A sodium ion battery manufacturing process according to claim 1, characterized in that: In step S5 , the thickness of the aluminum foil is set to 15-30 μm, the thickness of the copper foil is set to 6-12 μm, the coating thickness of the positive electrode slurry is set to 80-150 μm, and the coating thickness of the negative electrode slurry is set to 60-120 μm.

8. A sodium ion battery manufacturing process according to claim 1, characterized in that: In step S7, the charge and discharge capacity and the charge and discharge efficiency are detected.

Images