CN113036211A - Ultralow temperature lithium ion battery and processing method thereof - Google Patents
Ultralow temperature lithium ion battery and processing method thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M4/134—Electrodes based on metals, Si or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M4/139—Processes of manufacture
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses an ultra-low temperature lithium ion battery and a processing method thereof, and the formula comprises: positive electrode slurry composition: lithium iron phosphate, lithium manganate, carbon nanotubes, a binder, a conductive agent and a dispersing agent; the negative electrode slurry comprises the following components: silicon powder, graphite, asphalt powder, a binder and a dispersant; the processing method comprises the following steps of firstly, preparing slurry; coating a base material; step three, rolling; step four, tabletting; step five, assembling; step six, activating; according to the invention, by controlling the particle size of the positive electrode solid raw material mixture of the lithium ion battery and adjusting the formula of the negative electrode raw material and the raw material ratio of the electrolyte, a stable environment is provided for the formation of SEI, meanwhile, the viscosity of the electrolyte in a low-temperature environment is reduced, and the low-temperature resistance of the battery is greatly improved.
Description
Technical Field
The invention relates to the technical field of lithium ions, in particular to an ultralow temperature lithium ion battery and a processing method thereof.
Background
The lithium ion battery is the most rapidly developed technology in the battery industry, and is widely popular among people due to the advantages of high working voltage, high energy density, long cycle life, small self-discharge, no memory effect, green environmental protection and the like, but the formula of the conventional lithium ion battery cannot ensure the good performance of the lithium ion battery in severe environment, and the performance and the service life of the manufactured lithium ion battery can be remarkably reduced in the ultralow temperature environment.
Disclosure of Invention
The invention aims to provide an ultralow temperature lithium ion battery and a processing method 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: an ultra-low temperature lithium ion battery comprises the following components: positive electrode slurry composition: lithium iron phosphate, lithium manganate, carbon nanotubes, a binder, a conductive agent and a dispersing agent; the negative electrode slurry comprises the following components: silicon powder, graphite, asphalt powder, a binder and a dispersant; the weight percentages of the components are respectively as follows: positive electrode slurry composition: 40-50% of lithium iron phosphate, 12-18% of lithium manganate, 3-5% of carbon nano tube, 4-8% of binder, 2-5% of conductive agent and 1-3% of dispersing agent; the negative electrode slurry comprises the following components: 3 to 7 percent of silicon powder, 16 to 21 percent of graphite, 1 to 3 percent of asphalt powder, 0.5 to 2 percent of binder and 0.5 to 2 percent of dispersant.
A processing method of an ultralow temperature lithium ion battery comprises the following steps of preparing slurry; coating a base material; step three, rolling; step four, tabletting; step five, assembling; step six, activating;
in the first step, the preparation of the slurry comprises the following steps:
1) putting a proper amount of lithium iron phosphate, lithium manganate and carbon nano tubes into a ball mill for ball milling treatment;
2) scattering the ball-milled mixture by using a molecular sieve and then drying;
3) putting the dried mixture into a stirrer, adding a binder, a conductive agent and a dispersing agent, and uniformly stirring;
4) carrying out vacuumizing and defoaming treatment on the slurry to obtain anode slurry;
5) putting a proper amount of silicon powder, graphite and asphalt powder into a ball mill for ball milling treatment;
6) scattering the ball-milled mixture by using a molecular sieve and then drying;
7) putting the dried mixture into a stirrer, adding a binder and a dispersant, and uniformly stirring;
8) carrying out vacuumizing and defoaming treatment on the slurry to obtain negative electrode slurry;
in the second step, the coating of the substrate comprises the following steps:
1) respectively loading the anode slurry and the cathode slurry into automatic feeding equipment;
2) respectively loading the anode substrate and the cathode substrate onto an automatic unwinding device;
3) starting an automatic coating machine to coat slurry to obtain a wet pole piece;
4) conveying the coated wet pole piece to a drying oven for hot air drying;
5) winding the dried pole piece by an automatic winding device;
in the third step, rolling the pole piece by using a roller press;
in the fourth step, a pole piece sheet making machine is used for cutting the rolled pole piece to obtain a pole piece with a proper size;
in the fifth step, the assembly comprises the following steps:
1) manufacturing the diaphragm, the positive plate and the negative plate into a battery cell by using a winding machine or a laminating machine;
2) welding a tab on the pole piece;
3) the battery core is placed into a shell for pre-packaging, wherein the shell is one of a steel shell, an aluminum shell or an aluminum-plastic film;
4) baking the pre-sealed battery cell;
5) injecting electrolyte by using a vacuum liquid injection machine;
6) packaging the battery to obtain a finished battery;
and in the sixth step, the finished battery is subjected to formation treatment and quality detection.
According to the technical scheme, the weight percentages of the components are as follows: positive electrode slurry composition: 45% of lithium iron phosphate, 15% of lithium manganate, 3.5% of carbon nano tube, 6% of binder, 3% of conductive agent and 2.5% of dispersing agent; the negative electrode slurry comprises the following components: 6% of silicon powder, 19% of graphite, 2% of asphalt powder, 2% of binder and 1% of dispersant.
According to the technical scheme, in the step 1), the ball-material ratio in the ball mill is 8:1, the rotating speed is 300r/min, and the time is 1 h.
According to the above technical scheme, in the step one 2), the particle size of the mixture is 100-200 nm.
According to the technical scheme, in the step one 3), the rotating speed of the stirrer is 45r/min, and the time is 50 min.
According to the technical scheme, in the step one 3), the binder is a mixed solution of polyvinylidene fluoride and N-methyl pyrrolidone, the conductive agent is superconducting carbon black, and the dispersing agent is polyethylene glycol.
According to the technical scheme, in the second step 2), the anode base material is an aluminum foil, and the cathode base material is a copper foil.
According to the technical scheme, in the step five 5), the electrolyte is prepared from a solute and a solvent, wherein the solute comprises 60% of lithium hexafluorophosphate, 10% of lithium tetrafluoroborate and 10% of lithium perchlorate, and the solvent comprises 12% of ethyl propionate, 5% of ethyl acetate and 3% of fluoroethylene carbonate.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, by controlling the particle size of the positive electrode solid raw material mixture of the lithium ion battery and adjusting the formula of the negative electrode raw material and the raw material ratio of the electrolyte, a stable environment is provided for the formation of SEI, meanwhile, the viscosity of the electrolyte in a low-temperature environment is reduced, and the low-temperature resistance of the battery is greatly improved.
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 flow chart of the method 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:
example 1:
an ultra-low temperature lithium ion battery comprises the following components: positive electrode slurry composition: lithium iron phosphate, lithium manganate, carbon nanotubes, a binder, a conductive agent and a dispersing agent; the negative electrode slurry comprises the following components: silicon powder, graphite, asphalt powder, a binder and a dispersant; the weight percentages of the components are respectively as follows: positive electrode slurry composition: 45% of lithium iron phosphate, 15% of lithium manganate, 3.5% of carbon nano tube, 6% of binder, 3% of conductive agent and 2.5% of dispersing agent; the negative electrode slurry comprises the following components: 6% of silicon powder, 19% of graphite, 2% of asphalt powder, 2% of binder and 1% of dispersant.
A processing method of an ultralow temperature lithium ion battery comprises the following steps of preparing slurry; coating a base material; step three, rolling; step four, tabletting; step five, assembling; step six, activating;
in the first step, the preparation of the slurry comprises the following steps:
1) putting a proper amount of lithium iron phosphate, lithium manganate and carbon nano tubes into a ball mill for ball milling treatment, wherein the ball-to-material ratio in the ball mill is 8:1, the rotating speed is 300r/min, and the time is 1 h;
2) scattering the ball-milled mixture by using a molecular sieve, and then drying, wherein the particle size of the mixture is 150 nm;
3) putting the dried mixture into a stirrer, adding a binder, a conductive agent and a dispersing agent, uniformly stirring, wherein the rotating speed of the stirrer is 45r/min, the time is 50min, the binder is a mixed solution of polyvinylidene fluoride and N-methyl pyrrolidone, the conductive agent is superconducting carbon black, and the dispersing agent is polyethylene glycol;
4) carrying out vacuumizing and defoaming treatment on the slurry to obtain anode slurry;
5) putting a proper amount of silicon powder, graphite and asphalt powder into a ball mill for ball milling treatment;
6) scattering the ball-milled mixture by using a molecular sieve and then drying;
7) putting the dried mixture into a stirrer, adding a binder and a dispersant, and uniformly stirring;
8) carrying out vacuumizing and defoaming treatment on the slurry to obtain negative electrode slurry;
in the second step, the coating of the substrate comprises the following steps:
1) respectively loading the anode slurry and the cathode slurry into automatic feeding equipment;
2) respectively loading the aluminum foil and the copper foil on an automatic unreeling device;
3) starting an automatic coating machine to coat slurry to obtain a wet pole piece;
4) conveying the coated wet pole piece to a drying oven for hot air drying;
5) winding the dried pole piece by an automatic winding device;
in the third step, rolling the pole piece by using a roller press;
in the fourth step, a pole piece sheet making machine is used for cutting the rolled pole piece to obtain a pole piece with a proper size;
in the fifth step, the assembly comprises the following steps:
1) manufacturing the diaphragm, the positive plate and the negative plate into a battery cell by using a winding machine or a laminating machine;
2) welding a tab on the pole piece;
3) the battery core is placed into a shell for pre-packaging, wherein the shell is one of a steel shell, an aluminum shell or an aluminum-plastic film;
4) baking the pre-sealed battery cell;
5) injecting electrolyte solution into the container by using a vacuum liquid injection machine, wherein the electrolyte solution is prepared from solute and solvent,
the solute comprises 60 percent of lithium hexafluorophosphate, 10 percent of lithium tetrafluoroborate and 10 percent of lithium perchlorate, and the solvent comprises 12 percent of ethyl propionate, 5 percent of ethyl acetate and 3 percent of fluoro ethylene carbonate;
6) packaging the battery to obtain a finished battery;
and in the sixth step, the finished battery is subjected to formation treatment and quality detection.
Example 2:
an ultra-low temperature lithium ion battery comprises the following components: positive electrode slurry composition: lithium iron phosphate, lithium manganate, carbon nanotubes, a binder, a conductive agent and a dispersing agent; the negative electrode slurry comprises the following components: silicon powder, graphite, asphalt powder, a binder and a dispersant; the weight percentages of the components are respectively as follows: positive electrode slurry composition: 45% of lithium iron phosphate, 15% of lithium manganate, 3.5% of carbon nano tube, 6% of binder, 3% of conductive agent and 2.5% of dispersing agent; the negative electrode slurry comprises the following components: 6% of silicon powder, 19% of graphite, 2% of asphalt powder, 2% of binder and 1% of dispersant.
A processing method of an ultralow temperature lithium ion battery comprises the following steps of preparing slurry; coating a base material; step three, rolling; step four, tabletting; step five, assembling; step six, activating;
in the first step, the preparation of the slurry comprises the following steps:
1) putting a proper amount of lithium iron phosphate, lithium manganate and carbon nano tubes into a ball mill for ball milling treatment, wherein the ball-to-material ratio in the ball mill is 8:1, the rotating speed is 300r/min, and the time is 1 h;
2) scattering the ball-milled mixture by using a molecular sieve, and then drying the mixture, wherein the particle size of the mixture is 100 nm;
3) putting the dried mixture into a stirrer, adding a binder, a conductive agent and a dispersing agent, uniformly stirring, wherein the rotating speed of the stirrer is 45r/min, the time is 50min, the binder is a mixed solution of polyvinylidene fluoride and N-methyl pyrrolidone, the conductive agent is superconducting carbon black, and the dispersing agent is polyethylene glycol;
4) carrying out vacuumizing and defoaming treatment on the slurry to obtain anode slurry;
5) putting a proper amount of silicon powder, graphite and asphalt powder into a ball mill for ball milling treatment;
6) scattering the ball-milled mixture by using a molecular sieve and then drying;
7) putting the dried mixture into a stirrer, adding a binder and a dispersant, and uniformly stirring;
8) carrying out vacuumizing and defoaming treatment on the slurry to obtain negative electrode slurry;
in the second step, the coating of the substrate comprises the following steps:
1) respectively loading the anode slurry and the cathode slurry into automatic feeding equipment;
2) respectively loading the aluminum foil and the copper foil on an automatic unreeling device;
3) starting an automatic coating machine to coat slurry to obtain a wet pole piece;
4) conveying the coated wet pole piece to a drying oven for hot air drying;
5) winding the dried pole piece by an automatic winding device;
in the third step, rolling the pole piece by using a roller press;
in the fourth step, a pole piece sheet making machine is used for cutting the rolled pole piece to obtain a pole piece with a proper size;
in the fifth step, the assembly comprises the following steps:
1) manufacturing the diaphragm, the positive plate and the negative plate into a battery cell by using a winding machine or a laminating machine;
2) welding a tab on the pole piece;
3) the battery core is placed into a shell for pre-packaging, wherein the shell is one of a steel shell, an aluminum shell or an aluminum-plastic film;
4) baking the pre-sealed battery cell;
5) injecting an electrolyte by using a vacuum liquid injection machine, wherein the electrolyte is prepared from a solute and a solvent, the solute comprises 57% of lithium hexafluorophosphate, 13% of lithium tetrafluoroborate and 12% of lithium perchlorate, and the solvent comprises 12% of ethyl propionate, 4% of ethyl acetate and 2% of fluoroethylene carbonate;
6) packaging the battery to obtain a finished battery;
and in the sixth step, the finished battery is subjected to formation treatment and quality detection.
Example 3:
an ultra-low temperature lithium ion battery comprises the following components: positive electrode slurry composition: lithium iron phosphate, lithium manganate, carbon nanotubes, a binder, a conductive agent and a dispersing agent; the negative electrode slurry comprises the following components: silicon powder, graphite, asphalt powder, a binder and a dispersant; the weight percentages of the components are respectively as follows: positive electrode slurry composition: 45% of lithium iron phosphate, 15% of lithium manganate, 3.5% of carbon nano tube, 6% of binder, 3% of conductive agent and 2.5% of dispersing agent; the negative electrode slurry comprises the following components: 7% of silicon powder, 18% of graphite, 2% of asphalt powder, 2% of binder and 1% of dispersant.
A processing method of an ultralow temperature lithium ion battery comprises the following steps of preparing slurry; coating a base material; step three, rolling; step four, tabletting; step five, assembling; step six, activating;
in the first step, the preparation of the slurry comprises the following steps:
1) putting a proper amount of lithium iron phosphate, lithium manganate and carbon nano tubes into a ball mill for ball milling treatment, wherein the ball-to-material ratio in the ball mill is 8:1, the rotating speed is 300r/min, and the time is 1 h;
2) scattering the ball-milled mixture by using a molecular sieve, and then drying the mixture, wherein the particle size of the mixture is 200 nm;
3) putting the dried mixture into a stirrer, adding a binder, a conductive agent and a dispersing agent, uniformly stirring, wherein the rotating speed of the stirrer is 45r/min, the time is 50min, the binder is a mixed solution of polyvinylidene fluoride and N-methyl pyrrolidone, the conductive agent is superconducting carbon black, and the dispersing agent is polyethylene glycol;
4) carrying out vacuumizing and defoaming treatment on the slurry to obtain anode slurry;
5) putting a proper amount of silicon powder, graphite and asphalt powder into a ball mill for ball milling treatment;
6) scattering the ball-milled mixture by using a molecular sieve and then drying;
7) putting the dried mixture into a stirrer, adding a binder and a dispersant, and uniformly stirring;
8) carrying out vacuumizing and defoaming treatment on the slurry to obtain negative electrode slurry;
in the second step, the coating of the substrate comprises the following steps:
1) respectively loading the anode slurry and the cathode slurry into automatic feeding equipment;
2) respectively loading the aluminum foil and the copper foil on an automatic unreeling device;
3) starting an automatic coating machine to coat slurry to obtain a wet pole piece;
4) conveying the coated wet pole piece to a drying oven for hot air drying;
5) winding the dried pole piece by an automatic winding device;
in the third step, rolling the pole piece by using a roller press;
in the fourth step, a pole piece sheet making machine is used for cutting the rolled pole piece to obtain a pole piece with a proper size;
in the fifth step, the assembly comprises the following steps:
1) manufacturing the diaphragm, the positive plate and the negative plate into a battery cell by using a winding machine or a laminating machine;
2) welding a tab on the pole piece;
3) the battery core is placed into a shell for pre-packaging, wherein the shell is one of a steel shell, an aluminum shell or an aluminum-plastic film;
4) baking the pre-sealed battery cell;
5) injecting an electrolyte by using a vacuum liquid injection machine, wherein the electrolyte is prepared from a solute and a solvent, the solute comprises 63% of lithium hexafluorophosphate, 7% of lithium tetrafluoroborate and 14% of lithium perchlorate, and the solvent comprises 12% of ethyl propionate, 3% of ethyl acetate and 1% of fluoroethylene carbonate;
6) packaging the battery to obtain a finished battery;
and in the sixth step, the finished battery is subjected to formation treatment and quality detection.
The properties of the examples are compared in the following table:
based on the above, the invention provides a more stable SEI forming environment by controlling the particle size of the anode solid raw material mixture and allocating the proportion of the cathode raw material, reduces the viscosity of the electrolyte at low temperature and improves the low-temperature characteristic of the battery by controlling the proportion of the electrolyte.
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 (9)
1. An ultra-low temperature lithium ion battery, its characterized in that: the formula comprises the following components: positive electrode slurry composition: lithium iron phosphate, lithium manganate, carbon nanotubes, a binder, a conductive agent and a dispersing agent; the negative electrode slurry comprises the following components: silicon powder, graphite, asphalt powder, a binder and a dispersant; the weight percentages of the components are respectively as follows: positive electrode slurry composition: 40-50% of lithium iron phosphate, 12-18% of lithium manganate, 3-5% of carbon nano tube, 4-8% of binder, 2-5% of conductive agent and 1-3% of dispersing agent; the negative electrode slurry comprises the following components: 3 to 7 percent of silicon powder, 16 to 21 percent of graphite, 1 to 3 percent of asphalt powder, 0.5 to 2 percent of binder and 0.5 to 2 percent of dispersant.
2. A processing method of an ultralow temperature lithium ion battery comprises the following steps of preparing slurry; coating a base material; step three, rolling; step four, tabletting; step five, assembling; step six, activating; the method is characterized in that:
in the first step, the preparation of the slurry comprises the following steps:
1) putting a proper amount of lithium iron phosphate, lithium manganate and carbon nano tubes into a ball mill for ball milling treatment;
2) scattering the ball-milled mixture by using a molecular sieve and then drying;
3) putting the dried mixture into a stirrer, adding a binder, a conductive agent and a dispersing agent, and uniformly stirring;
4) carrying out vacuumizing and defoaming treatment on the slurry to obtain anode slurry;
5) putting a proper amount of silicon powder, graphite and asphalt powder into a ball mill for ball milling treatment;
6) scattering the ball-milled mixture by using a molecular sieve and then drying;
7) putting the dried mixture into a stirrer, adding a binder and a dispersant, and uniformly stirring;
8) carrying out vacuumizing and defoaming treatment on the slurry to obtain negative electrode slurry;
in the second step, the coating of the substrate comprises the following steps:
1) respectively loading the anode slurry and the cathode slurry into automatic feeding equipment;
2) respectively loading the anode substrate and the cathode substrate onto an automatic unwinding device;
3) starting an automatic coating machine to coat slurry to obtain a wet pole piece;
4) conveying the coated wet pole piece to a drying oven for hot air drying;
5) winding the dried pole piece by an automatic winding device;
in the third step, rolling the pole piece by using a roller press;
in the fourth step, a pole piece sheet making machine is used for cutting the rolled pole piece to obtain a pole piece with a proper size;
in the fifth step, the assembly comprises the following steps:
1) manufacturing the diaphragm, the positive plate and the negative plate into a battery cell by using a winding machine or a laminating machine;
2) welding a tab on the pole piece;
3) the battery core is placed into a shell for pre-packaging, wherein the shell is one of a steel shell, an aluminum shell or an aluminum-plastic film;
4) baking the pre-sealed battery cell;
5) injecting electrolyte by using a vacuum liquid injection machine;
6) packaging the battery to obtain a finished battery;
and in the sixth step, the finished battery is subjected to formation treatment and quality detection.
3. An ultra-low temperature lithium ion battery according to claim 1, wherein: the weight percentages of the components are respectively as follows: positive electrode slurry composition: 45% of lithium iron phosphate, 15% of lithium manganate, 3.5% of carbon nano tube, 6% of binder, 3% of conductive agent and 2.5% of dispersing agent; the negative electrode slurry comprises the following components: 6% of silicon powder, 19% of graphite, 2% of asphalt powder, 2% of binder and 1% of dispersant.
4. The processing method of the ultra-low temperature lithium ion battery according to claim 2, characterized in that: in the step 1), the ball-material ratio in the ball mill is 8:1, the rotating speed is 300r/min, and the time is 1 h.
5. The processing method of the ultra-low temperature lithium ion battery according to claim 2, characterized in that: in the step one 2), the particle size of the mixture is 100-200 nm.
6. The processing method of the ultra-low temperature lithium ion battery according to claim 2, characterized in that: in the step one 3), the rotating speed of the stirrer is 45r/min, and the time is 50 min.
7. The processing method of the ultra-low temperature lithium ion battery according to claim 2, characterized in that: in the step one 3), the binder is a mixed solution of polyvinylidene fluoride and N-methyl pyrrolidone, the conductive agent is superconducting carbon black, and the dispersing agent is polyethylene glycol.
8. The processing method of the ultra-low temperature lithium ion battery according to claim 2, characterized in that: in the second step 2), the anode substrate is an aluminum foil, and the cathode substrate is a copper foil.
9. The processing method of the ultra-low temperature lithium ion battery according to claim 2, characterized in that: in the fifth step 5), the electrolyte is prepared from a solute and a solvent, wherein the solute comprises 60% of lithium hexafluorophosphate, 10% of lithium tetrafluoroborate and 10% of lithium perchlorate, and the solvent comprises 12% of ethyl propionate, 5% of ethyl acetate and 3% of fluoroethylene carbonate.
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Citations (10)
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