CN112038631A - Lithium battery electrode plate with surface coated with natural graphite and processing technology thereof - Google Patents
Lithium battery electrode plate with surface coated with natural graphite and processing technology thereof Download PDFInfo
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H01M4/02—Electrodes composed of, or comprising, active material
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- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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Abstract
The invention discloses a lithium battery electrode plate with a surface coated with natural graphite and a processing technology thereof, and the formula comprises the following components: graphite, phenolic resin, sodium hexametaphosphate, copper foil, ethyl acetate and absolute ethyl alcohol, wherein the mass percentage of each component is as follows: 30-50 parts of graphite, 20-40 parts of phenolic resin, 10-20 parts of sodium hexametaphosphate, 15-25 parts of copper foil, 10-20 parts of ethyl acetate and 5-10 parts of absolute ethyl alcohol; according to the invention, graphite and phenolic resin are used as basic materials, sodium hexametaphosphate, ethyl acetate and absolute ethyl alcohol are matched for mixing, and then the mixture is coated on copper foil and calcined to obtain the lithium battery electrode plate with the surface coated with natural graphite.
Description
Technical Field
The invention relates to the technical field of lithium battery electrode plates, in particular to a lithium battery electrode plate with a surface coated with natural graphite and a processing technology thereof.
Background
The main constituent materials of the lithium ion battery comprise electrolyte, isolating materials, positive and negative electrode plates and the like; because the performance of the electrode plate of the lithium battery directly influences the performance of the lithium ion battery, the cost of the electrode plate of the lithium battery also directly determines the cost of the battery; the traditional lithium battery electrode plate is manufactured by calcining copper foil, so that the operation is complex, the conductivity is poor, the first coulombic efficiency is low, the cycle performance is reduced, and the first lithium intercalation capacity and the first reversible capacity are low, so that the service life of a battery cathode is short, the irreversible loss is increased, the use by a user is not facilitated, and the traditional lithium battery electrode plate is expensive in raw materials, the production cost is increased, and the processing and the production are not facilitated; in view of these defects, it is necessary to design an electrode sheet for lithium battery with a surface coated with natural graphite and a processing process thereof.
Disclosure of Invention
The invention aims to provide a lithium battery electrode plate with a surface coated with natural graphite and a processing technology thereof, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a lithium battery electrode plate with a surface coated with natural graphite comprises the following components: graphite, phenolic resin, sodium hexametaphosphate, copper foil, ethyl acetate and absolute ethyl alcohol, wherein the mass percentage of each component is as follows: 30-50 parts of graphite, 20-40 parts of phenolic resin, 10-20 parts of sodium hexametaphosphate, 15-25 parts of copper foil, 10-20 parts of ethyl acetate and 5-10 parts of absolute ethyl alcohol.
A processing technology of a lithium battery electrode plate with a surface coated with natural graphite comprises the following steps of firstly, selecting raw materials; step two: shaping and processing; step three, mixing and reacting; step four, high-temperature calcination; step five, packaging and storing;
in the first step, the components in percentage by mass are as follows: 30-50 parts of graphite, 20-40 parts of phenolic resin, 10-20 parts of sodium hexametaphosphate, 15-25 parts of copper foil, 10-20 parts of ethyl acetate and 5-10 parts of absolute ethyl alcohol;
in the second step, the shaping process comprises the following steps:
1) manually cleaning graphite, adding sodium hexametaphosphate, and stirring;
2) adding anhydrous ethanol, heating to 80-100 deg.C, and stirring for 20-40min until the solution is evaporated;
3) taking out the graphite, pouring the graphite into a grinder, and starting the grinder for processing until the graphite is ground into powder;
in the third step, the mixing reaction comprises the following steps:
1) manually preparing a reaction kettle, cleaning the reaction kettle, adding ethyl acetate, then adding phenolic resin, and uniformly stirring;
2) adding the powdery graphite in the step two 3) into the reaction kettle, continuously stirring for 10-20min, raising the temperature to 90-100 ℃ until the solution is volatilized, stopping heating, standing and cooling to room temperature;
3) pouring the mixture into an ultrasonic machine, starting the ultrasonic machine, and carrying out vibration stirring processing by ultrasonic to obtain a lithium battery electrode plate raw material;
in the fourth step, the high-temperature calcination comprises the following steps:
1) manually stirring the raw material of the electrode plate of the lithium battery obtained in the step three 3) uniformly, then uniformly coating the raw material on a copper foil, and continuously coating for 2-3 times;
2) putting the coated copper foil into a tube furnace, introducing inert gas to exhaust air, raising the temperature to 800-;
3) taking out the calcined copper foil, drying for 1-2h by using an air heater, standing and cooling to room temperature to obtain the lithium battery electrode plate with the surface coated with natural graphite;
and in the fifth step, bundling and packaging the lithium battery electrode slices with the surfaces coated with the natural graphite obtained in the fourth step 3), ensuring that the weight of each bundle is the same, and then packaging and storing the bundled lithium battery electrode slices with the surfaces coated with the natural graphite integrally in boxes.
According to the technical scheme, the components are as follows by mass percent: 35 parts of graphite, 20 parts of phenolic resin, 10 parts of sodium hexametaphosphate, 20 parts of copper foil, 10 parts of ethyl acetate and 5 parts of absolute ethyl alcohol.
According to the technical scheme, the absolute ethyl alcohol is obtained by mixing ethyl alcohol and water according to the ratio of 2: 1.
According to the technical scheme, the step two 3) needs to be filtered by a screen after grinding.
According to the technical scheme, the power of the ultrasonic machine in the step three 3) is 90-100 Hz.
According to the technical scheme, the temperature of the hot air blower in the step four 3) is 100-150 ℃.
According to the technical scheme, ultraviolet irradiation disinfection is required before boxing in the step five.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, graphite and phenolic resin are used as basic materials, sodium hexametaphosphate, ethyl acetate and absolute ethyl alcohol are matched for mixing, and then the mixture is coated on copper foil and calcined to obtain the lithium battery electrode plate with the surface coated with natural graphite.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a lithium battery electrode plate with a surface coated with natural graphite and a processing technology thereof are disclosed:
example 1:
a lithium battery electrode plate with a surface coated with natural graphite comprises the following components: graphite, phenolic resin, sodium hexametaphosphate, copper foil, ethyl acetate and absolute ethyl alcohol, wherein the mass percentage of each component is as follows: 30 parts of graphite, 20 parts of phenolic resin, 10 parts of sodium hexametaphosphate, 25 parts of copper foil, 10 parts of ethyl acetate and 5 parts of absolute ethyl alcohol.
A processing technology of a lithium battery electrode plate with a surface coated with natural graphite comprises the following steps of firstly, selecting raw materials; step two: shaping and processing; step three, mixing and reacting; step four, high-temperature calcination; step five, packaging and storing;
in the first step, the components in percentage by mass are as follows: weighing 30 parts of graphite, 20 parts of phenolic resin, 10 parts of sodium hexametaphosphate, 25 parts of copper foil, 10 parts of ethyl acetate and 5 parts of absolute ethyl alcohol;
in the second step, the shaping process comprises the following steps:
1) manually cleaning graphite, adding sodium hexametaphosphate, and stirring;
2) adding anhydrous ethanol, heating to 80-100 deg.C, and stirring for 20-40min until the solution is evaporated;
3) taking out graphite, pouring the graphite into a grinder, starting the grinder for processing until the graphite is ground into powder, and filtering by using a screen after grinding;
in the third step, the mixing reaction comprises the following steps:
1) manually preparing a reaction kettle, cleaning the reaction kettle, adding ethyl acetate, then adding phenolic resin, and uniformly stirring;
2) adding the powdery graphite in the step two 3) into the reaction kettle, continuously stirring for 10-20min, raising the temperature to 90-100 ℃ until the solution is volatilized, stopping heating, standing and cooling to room temperature;
3) pouring the mixture into an ultrasonic machine, wherein the power of the ultrasonic machine is 90-100Hz, starting the ultrasonic machine, and carrying out vibration stirring processing by ultrasonic to obtain a lithium battery electrode plate raw material;
in the fourth step, the high-temperature calcination comprises the following steps:
1) manually stirring the raw material of the electrode plate of the lithium battery obtained in the step three 3) uniformly, then uniformly coating the raw material on a copper foil, and continuously coating for 2-3 times;
2) putting the coated copper foil into a tube furnace, introducing inert gas to exhaust air, raising the temperature to 800-;
3) taking out the calcined copper foil, drying for 1-2h by using an air heater at the temperature of 100-150 ℃, standing and cooling to room temperature to obtain the lithium battery electrode plate with the surface coated with natural graphite;
and in the fifth step, bundling and packaging the lithium battery electrode slices with the surfaces coated with the natural graphite obtained in the fourth step 3), ensuring that the weight of each bundle is the same, packaging and storing the bundled lithium battery electrode slices with the surfaces coated with the natural graphite in a whole manner in boxes, and performing ultraviolet irradiation disinfection before boxing.
Wherein the anhydrous ethanol is obtained by mixing ethanol and water according to the ratio of 2: 1.
Example 2:
a lithium battery electrode plate with a surface coated with natural graphite comprises the following components: graphite, phenolic resin, sodium hexametaphosphate, copper foil, ethyl acetate and absolute ethyl alcohol, wherein the mass percentage of each component is as follows: 35 parts of graphite, 20 parts of phenolic resin, 10 parts of sodium hexametaphosphate, 20 parts of copper foil, 10 parts of ethyl acetate and 5 parts of absolute ethyl alcohol.
A processing technology of a lithium battery electrode plate with a surface coated with natural graphite comprises the following steps of firstly, selecting raw materials; step two: shaping and processing; step three, mixing and reacting; step four, high-temperature calcination; step five, packaging and storing;
in the first step, the components in percentage by mass are as follows: weighing 35 parts of graphite, 20 parts of phenolic resin, 10 parts of sodium hexametaphosphate, 20 parts of copper foil, 10 parts of ethyl acetate and 5 parts of absolute ethyl alcohol;
in the second step, the shaping process comprises the following steps:
1) manually cleaning graphite, adding sodium hexametaphosphate, and stirring;
2) adding anhydrous ethanol, heating to 80-100 deg.C, and stirring for 20-40min until the solution is evaporated;
3) taking out graphite, pouring the graphite into a grinder, starting the grinder for processing until the graphite is ground into powder, and filtering by using a screen after grinding;
in the third step, the mixing reaction comprises the following steps:
1) manually preparing a reaction kettle, cleaning the reaction kettle, adding ethyl acetate, then adding phenolic resin, and uniformly stirring;
2) adding the powdery graphite in the step two 3) into the reaction kettle, continuously stirring for 10-20min, raising the temperature to 90-100 ℃ until the solution is volatilized, stopping heating, standing and cooling to room temperature;
3) pouring the mixture into an ultrasonic machine, wherein the power of the ultrasonic machine is 90-100Hz, starting the ultrasonic machine, and carrying out vibration stirring processing by ultrasonic to obtain a lithium battery electrode plate raw material;
in the fourth step, the high-temperature calcination comprises the following steps:
1) manually stirring the raw material of the electrode plate of the lithium battery obtained in the step three 3) uniformly, then uniformly coating the raw material on a copper foil, and continuously coating for 2-3 times;
2) putting the coated copper foil into a tube furnace, introducing inert gas to exhaust air, raising the temperature to 800-;
3) taking out the calcined copper foil, drying for 1-2h by using an air heater at the temperature of 100-150 ℃, standing and cooling to room temperature to obtain the lithium battery electrode plate with the surface coated with natural graphite;
and in the fifth step, bundling and packaging the lithium battery electrode slices with the surfaces coated with the natural graphite obtained in the fourth step 3), ensuring that the weight of each bundle is the same, packaging and storing the bundled lithium battery electrode slices with the surfaces coated with the natural graphite in a whole manner in boxes, and performing ultraviolet irradiation disinfection before boxing.
Wherein the anhydrous ethanol is obtained by mixing ethanol and water according to the ratio of 2: 1.
Example 3:
a lithium battery electrode plate with a surface coated with natural graphite comprises the following components: graphite, phenolic resin, sodium hexametaphosphate, copper foil, ethyl acetate and absolute ethyl alcohol, wherein the mass percentage of each component is as follows: 40 parts of graphite, 20 parts of phenolic resin, 10 parts of sodium hexametaphosphate, 15 parts of copper foil, 10 parts of ethyl acetate and 10 parts of absolute ethyl alcohol.
A processing technology of a lithium battery electrode plate with a surface coated with natural graphite comprises the following steps of firstly, selecting raw materials; step two: shaping and processing; step three, mixing and reacting; step four, high-temperature calcination; step five, packaging and storing;
in the first step, the components in percentage by mass are as follows: weighing 40 parts of graphite, 20 parts of phenolic resin, 10 parts of sodium hexametaphosphate, 15 parts of copper foil, 10 parts of ethyl acetate and 10 parts of absolute ethyl alcohol;
in the second step, the shaping process comprises the following steps:
1) manually cleaning graphite, adding sodium hexametaphosphate, and stirring;
2) adding anhydrous ethanol, heating to 80-100 deg.C, and stirring for 20-40min until the solution is evaporated;
3) taking out graphite, pouring the graphite into a grinder, starting the grinder for processing until the graphite is ground into powder, and filtering by using a screen after grinding;
in the third step, the mixing reaction comprises the following steps:
1) manually preparing a reaction kettle, cleaning the reaction kettle, adding ethyl acetate, then adding phenolic resin, and uniformly stirring;
2) adding the powdery graphite in the step two 3) into the reaction kettle, continuously stirring for 10-20min, raising the temperature to 90-100 ℃ until the solution is volatilized, stopping heating, standing and cooling to room temperature;
3) pouring the mixture into an ultrasonic machine, wherein the power of the ultrasonic machine is 90-100Hz, starting the ultrasonic machine, and carrying out vibration stirring processing by ultrasonic to obtain a lithium battery electrode plate raw material;
in the fourth step, the high-temperature calcination comprises the following steps:
1) manually stirring the raw material of the electrode plate of the lithium battery obtained in the step three 3) uniformly, then uniformly coating the raw material on a copper foil, and continuously coating for 2-3 times;
2) putting the coated copper foil into a tube furnace, introducing inert gas to exhaust air, raising the temperature to 800-;
3) taking out the calcined copper foil, drying for 1-2h by using an air heater at the temperature of 100-150 ℃, standing and cooling to room temperature to obtain the lithium battery electrode plate with the surface coated with natural graphite;
and in the fifth step, bundling and packaging the lithium battery electrode slices with the surfaces coated with the natural graphite obtained in the fourth step 3), ensuring that the weight of each bundle is the same, packaging and storing the bundled lithium battery electrode slices with the surfaces coated with the natural graphite in a whole manner in boxes, and performing ultraviolet irradiation disinfection before boxing.
Wherein the anhydrous ethanol is obtained by mixing ethanol and water according to the ratio of 2: 1.
The properties of the examples are compared in the following table:
based on the above, the lithium battery electrode plate has the advantages that graphite and phenolic resin are used as basic materials, sodium hexametaphosphate, ethyl acetate and absolute ethyl alcohol are mixed, and then the mixture is coated on copper foil and calcined to obtain the lithium battery electrode plate with the surface coated with natural graphite.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a surface cladding has lithium cell electrode slice of natural graphite which characterized in that: the formula comprises the following components: graphite, phenolic resin, sodium hexametaphosphate, copper foil, ethyl acetate and absolute ethyl alcohol, wherein the mass percentage of each component is as follows: 30-50 parts of graphite, 20-40 parts of phenolic resin, 10-20 parts of sodium hexametaphosphate, 15-25 parts of copper foil, 10-20 parts of ethyl acetate and 5-10 parts of absolute ethyl alcohol.
2. A processing technology of a lithium battery electrode plate with a surface coated with natural graphite comprises the following steps of firstly, selecting raw materials; step two: shaping and processing; step three, mixing and reacting; step four, high-temperature calcination; step five, packaging and storing; the method is characterized in that:
in the first step, the components in percentage by mass are as follows: 30-50 parts of graphite, 20-40 parts of phenolic resin, 10-20 parts of sodium hexametaphosphate, 15-25 parts of copper foil, 10-20 parts of ethyl acetate and 5-10 parts of absolute ethyl alcohol;
in the second step, the shaping process comprises the following steps:
1) manually cleaning graphite, adding sodium hexametaphosphate, and stirring;
2) adding anhydrous ethanol, heating to 80-100 deg.C, and stirring for 20-40min until the solution is evaporated;
3) taking out the graphite, pouring the graphite into a grinder, and starting the grinder for processing until the graphite is ground into powder;
in the third step, the mixing reaction comprises the following steps:
1) manually preparing a reaction kettle, cleaning the reaction kettle, adding ethyl acetate, then adding phenolic resin, and uniformly stirring;
2) adding the powdery graphite in the step two 3) into the reaction kettle, continuously stirring for 10-20min, raising the temperature to 90-100 ℃ until the solution is volatilized, stopping heating, standing and cooling to room temperature;
3) pouring the mixture into an ultrasonic machine, starting the ultrasonic machine, and carrying out vibration stirring processing by ultrasonic to obtain a lithium battery electrode plate raw material;
in the fourth step, the high-temperature calcination comprises the following steps:
1) manually stirring the raw material of the electrode plate of the lithium battery obtained in the step three 3) uniformly, then uniformly coating the raw material on a copper foil, and continuously coating for 2-3 times;
2) putting the coated copper foil into a tube furnace, introducing inert gas to exhaust air, raising the temperature to 800-;
3) taking out the calcined copper foil, drying for 1-2h by using an air heater, standing and cooling to room temperature to obtain the lithium battery electrode plate with the surface coated with natural graphite;
and in the fifth step, bundling and packaging the lithium battery electrode slices with the surfaces coated with the natural graphite obtained in the fourth step 3), ensuring that the weight of each bundle is the same, and then packaging and storing the bundled lithium battery electrode slices with the surfaces coated with the natural graphite integrally in boxes.
3. The electrode sheet for lithium batteries having a surface coated with natural graphite according to claim 1, wherein: the components are as follows by mass percent: 35 parts of graphite, 20 parts of phenolic resin, 10 parts of sodium hexametaphosphate, 20 parts of copper foil, 10 parts of ethyl acetate and 5 parts of absolute ethyl alcohol.
4. The electrode sheet for lithium batteries having a surface coated with natural graphite according to claim 1, wherein: the absolute ethyl alcohol is obtained by mixing ethyl alcohol and water according to the ratio of 2: 1.
5. The processing technology of the lithium battery electrode plate with the surface coated with the natural graphite as claimed in claim 2, is characterized in that: and (3) filtering by using a screen after grinding in the step two 3).
6. The processing technology of the lithium battery electrode plate with the surface coated with the natural graphite as claimed in claim 2, is characterized in that: the power of the ultrasonic machine in the step three 3) is 90-100 Hz.
7. The processing technology of the lithium battery electrode plate with the surface coated with the natural graphite as claimed in claim 2, is characterized in that: the temperature of the hot air blower in the step four 3) is 100-150 ℃.
8. The processing technology of the lithium battery electrode plate with the surface coated with the natural graphite as claimed in claim 2, is characterized in that: and in the fifth step, ultraviolet irradiation disinfection is required before boxing.
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