Preparation method of hard carbon material sodium ion negative electrode battery

Abstract

The invention discloses a preparation method of a hard carbon material sodium ion negative electrode battery. The preparation method comprises the following steps: S1, preparing a battery negative electrode; s2, selecting a proper positive electrode plate, a diaphragm, an electrolyte and a battery shell; s3, assembling the button cell; s4, testing the battery; the S1 process comprises the following steps: 1, purchasing enough coke rice sticks, and dividing the coke rice sticks into a plurality of sections; 2, the segmented coke rice sticks are crushed into particles with the diameter smaller than 3 mm; 3, putting sufficient coke rice stick particles into a crucible, and calcining for 2 hours in a nitrogen environment; 4, after calcination is completed, active substances in the crucible are taken out, and hydrochloric acid is added for cleaning until salt impurities are washed away; 5, weighing and taking enough active substances, and fully grinding the active substances to prepare a coating; 6, drying the coating at 100 DEG C for 12 hours; 7, cutting the sheet to complete the manufacturing of the negative electrode sheet; the raw materials for producing the battery negative electrode are common puffed food, the price is low, the obtaining is simple, and compared with a traditional battery negative electrode, the battery negative electrode has higher sodium ion loading capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of battery preparation, and more specifically, to a method for preparing a hard carbon material sodium ion negative electrode battery. Background Art

[0002] Sodium-ion batteries are secondary batteries that rely mainly on the movement of sodium ions between the positive and negative electrodes to work. Their working principle is similar to that of lithium-ion batteries. Compared with lithium-ion batteries, sodium-ion batteries have the following advantages: (1) sodium salt raw materials are abundant and inexpensive; (2) due to the characteristics of sodium salt, low-concentration electrolytes can be used to reduce costs; (3) sodium ions do not form alloys with aluminum, and aluminum foil can be used as the negative electrode current collector, which can further reduce costs by about 8%.

[0003] However, the sodium ion loading capacity of the button-type sodium ion battery negative electrode manufactured by existing means is relatively weak, resulting in a relatively weak discharge intensity of the button-type sodium ion battery, thereby reducing the versatility and use effect of the sodium ion battery in some occasions. Summary of the invention

[0004] The present invention provides a method for preparing a hard carbon material sodium ion negative electrode battery, so as to solve the problem that the sodium ion loading capacity of the button type sodium ion battery negative electrode manufactured by the existing means is weak, resulting in weak discharge intensity of the button type sodium ion battery.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A method for preparing a hard carbon material sodium ion negative electrode battery comprises the following steps:

[0007] S1: prepare the battery negative electrode;

[0008] S2: Select appropriate positive electrode sheet, separator, electrolyte and battery casing;

[0009] S3: Assemble button cell battery;

[0010] S4: Perform battery test;

[0011] Preferably, the S1 process includes:

[0012] 1. Purchase a sufficient amount of coke sticks, divide the coke sticks into multiple sections and then simply dry them, and the maximum length of the outer side of each section of the coke stick is less than or equal to 3 cm;

[0013] 2. Place the segmented coke sticks into a plastic bag with a self-sealing strip, shake and squeeze the coke sticks until all the segmented coke sticks are broken into particles with a diameter of less than 3 mm;

[0014] 3. Place sufficient coke stick particles into a crucible and calcine at 800°C for 2 hours in a nitrogen environment;

[0015] 4. After calcination, take out the active material in the crucible and wash it with hydrochloric acid until the salt impurities are washed away;

[0016] 5. Weigh and take a sufficient amount of active substance, take active substance: Ketjen black: PVDF = 8:1:1, put it into a mortar, grind it thoroughly to make a coating;

[0017] 6. Apply the coating to the surface of the aluminum foil, place it on a tray, put it in an oven, and dry it at 100°C for 12 hours;

[0018] 7. Cutting, weighing and recording all the negative electrode sheets after cutting, and completing the production of negative electrode sheets;

[0019] Preferably, the diaphragm material in the S2 process is preferably glass fiber, and the electrolyte is preferably 1M NACLO4+DME.

[0020] Preferably, the S3 process comprises the following steps:

[0021] 1. Place all battery materials in the glove box to keep the inside of the glove box free of water and oxygen;

[0022] 2. Place sufficient positive electrode shells in the battery panel in turn, take an equal amount of positive electrode sheets, make the active material of the positive electrode sheets face upward, and place the positive electrode sheets in the center of the positive electrode shell;

[0023] 3. Place the separator paper on top of the positive electrode sheet, draw up the electrolyte through a dropper and drop 5 to 6 drops on top of the separator paper;

[0024] 4. Place the sodium membrane, gasket, spring and negative electrode shell in sequence to complete the battery assembly;

[0025] 5. Place the assembled battery into a sealing machine for packaging, and the packaging time is about 15 seconds;

[0026] 6. Wipe off the overflowed electrolyte with dust-free paper to complete the battery preparation;

[0027] Preferably, the battery testing items include XRD and SEM.

[0028] The principle and beneficial effects of this technical solution:

[0029] (1) The method for preparing the negative electrode of a sodium ion battery adopted in the present invention uses amorphous carbon as the negative electrode material. Compared with titanium-based negative electrode materials and organic negative electrode materials, amorphous carbon has abundant resources, diverse structures, and is environmentally friendly, and has the broadest application prospects. On the other hand, the amorphous carbon used in the present invention has a porous structure, and has a stronger sodium ion loading capacity than the battery negative electrode made of traditional amorphous carbon, thereby enhancing the large current discharge capacity of the sodium ion battery during the discharge process.

[0030] (2) The raw materials selected for producing the battery negative electrode in the present invention are puffed foods commonly found in life, which are inexpensive and easy to obtain, and have a lower sugar content than foods such as popcorn. Therefore, it is easier to obtain porous carbon particles after calcination in a crucible, thereby maintaining the structural uniformity and relatively average sodium ion loading capacity of the battery negative electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a test result diagram when the present invention uses a rice stick as the negative electrode material;

[0032] Figure 2 This is a test result diagram when bamboo powder is used as the negative electrode material in the present invention;

[0033] Figure 3 The xrd of the negative electrode material of the present invention at different temperatures;

[0034] Figure 4 This is a backscattered electron image of the negative electrode material in the present invention at 1000 times magnification;

[0035] Figure 5 is a secondary electron image of the negative electrode material in the present invention at 1000 times magnification; DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0037] Example:

[0038] The present invention provides a method for preparing a hard carbon material sodium ion negative electrode battery, and the method comprises the following steps:

[0039] S1: prepare the battery negative electrode;

[0040] S2: Select appropriate positive electrode sheet, separator, electrolyte and battery casing;

[0041] S3: Assemble button battery;

[0042] S4: Perform battery test;

[0043] The S1 process includes:

[0044] 1. Purchase enough coke sticks, divide them into several sections and dry them simply. The maximum length of the outer side of each section of coke stick is less than or equal to 3cm.

[0045] 2. Place the segmented coke sticks into a plastic bag with a self-sealing strip, shake and squeeze the coke sticks until all the segmented coke sticks are broken into particles with a diameter of less than 3 mm;

[0046] 3. Place sufficient coke stick particles into a crucible and calcine at 800°C for 2 hours in a nitrogen environment;

[0047] 4. After calcination, take out the active material in the crucible and wash it with hydrochloric acid until the salt impurities are washed away;

[0048] 5. Weigh and take a sufficient amount of active substance, take active substance: Ketjen black: PVDF = 8:1:1, put it into a mortar, grind it thoroughly to make a coating;

[0049] 6. Apply the coating to the surface of the aluminum foil, place it on a tray, put it in an oven, and dry it at 100°C for 12 hours;

[0050] 7. Cutting, weighing and recording all the negative electrode sheets after cutting, and completing the production of negative electrode sheets;

[0051] The preferred diaphragm material in the S2 process is glass fiber, and the electrolyte is preferably 1M NACLO4+DME.

[0052] The S3 process consists of the following steps:

[0053] 1. Place all battery materials in the glove box to keep the inside of the glove box free of water and oxygen;

[0054] 2. Place sufficient positive electrode shells in the battery panel in turn, take an equal amount of positive electrode sheets, make the active material of the positive electrode sheets face upward, and place the positive electrode sheets in the center of the positive electrode shell;

[0055] 3. Place the separator paper on top of the positive electrode sheet, draw up the electrolyte through a dropper and drop 5 to 6 drops on top of the separator paper;

[0056] 4. Place the sodium membrane, gasket, spring and negative electrode shell in sequence to complete the battery assembly;

[0057] 5. Place the assembled battery into the sealing machine for packaging, and the packaging time is about 15s;

[0058] 6. Wipe off the overflowed electrolyte with dust-free paper to complete the battery preparation;

[0059] Battery testing items include XRD and SEM.

[0060] By the attached Figure 4 and attached Figure 5 It can be seen that the hard carbon negative electrode material used in the present invention is conducive to the storage of sodium ions, and can facilitate the embedding or extraction of sodium ions during the charging and discharging process, thereby increasing the capacity of the battery.

[0061] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for preparing a hard carbon material sodium ion negative electrode battery, characterized in that: The following steps are involved: S1: prepare the battery negative electrode; S2: Select appropriate diaphragm, electrolyte and battery casing; S3: Assemble button cell battery; S4: Perform a battery test.

2. The method for preparing a hard carbon material sodium ion negative electrode battery according to claim 1, characterized in that: The S1 process includes:

1. Purchase a sufficient amount of coke sticks, divide the coke sticks into multiple sections and then simply dry them, and the maximum length of the outer side of each section of the coke stick is less than or equal to 3 cm; 2. Place the segmented coke sticks into a plastic bag with a self-sealing strip, shake and squeeze the coke sticks until all the segmented coke sticks are broken into particles with a diameter of less than 3 mm; 3. Place sufficient coke stick particles into a crucible and calcine at 800°C for 2 hours in a nitrogen environment; 4. After calcination, take out the active material in the crucible and wash it with hydrochloric acid until the salt impurities are washed away; 5. Weigh and take a sufficient amount of active substance, take active substance: Ketjen black: PVDF = 8:1:1, put it into a mortar, grind it thoroughly to make a coating; 6. Apply the coating to the surface of the aluminum foil, place it on a tray, put it in an oven, and dry it at 100°C for 12 hours; 7. Cutting, weighing and recording all the cut negative electrode sheets to complete the production of negative electrode sheets.

3. The method for preparing a hard carbon material sodium ion negative electrode battery according to claim 2, characterized in that: The diaphragm material in the S2 process is preferably glass fiber, and the electrolyte is preferably 1M NACLO4+DME.

4. The method for preparing a hard carbon material sodium ion negative electrode battery according to claim 3, characterized in that: The S3 process includes the following steps:

1. Place all battery materials in the glove box to keep the inside of the glove box free of water and oxygen; 2. Place sufficient positive electrode shells in the battery panel in turn, take an equal amount of positive electrode sheets, make the active material of the positive electrode sheets face upward, and place the positive electrode sheets in the center of the positive electrode shell; 3. Place the separator paper on top of the positive electrode sheet, draw up the electrolyte through a dropper and drop 5 to 6 drops on top of the separator paper; 4. Place the sodium membrane, gasket, spring and negative electrode shell in sequence to complete the battery assembly; 5. Place the assembled battery into a sealing machine for packaging, and the packaging time is about 15 seconds; 6. Wipe off the overflowed electrolyte with dust-free paper to complete the battery preparation.

5. The method for preparing a hard carbon material sodium ion negative electrode battery according to claim 4, characterized in that: The battery testing items include XRD and SEM.

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