CN110931880A - Polymer lithium ion battery and preparation method thereof - Google Patents
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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
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- H—ELECTRICITY
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- 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
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- H—ELECTRICITY
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
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Abstract
The invention discloses a polymer lithium ion battery and a preparation method thereof, wherein the polymer lithium ion battery comprises a positive pole piece, a negative pole piece, a polymeric isolating membrane and electrolyte, wherein the polymeric isolating membrane comprises the following raw materials in parts by weight: the lithium ion battery comprises, by weight, 10-20 parts of polyacrylonitrile, 10-20 parts of polyoxypropylene, 10-20 parts of polyvinyl chloride, 10-20 parts of polyvinylidene fluoride and 10-20 parts of a binary copolymer of vinylidene fluoride and hexafluoropropylene, wherein a positive pole piece is one of lithium cobaltate, lithium manganate, a ternary material or a lithium iron phosphate material, and the lithium ion battery relates to the technical field of lithium ion batteries. The polymer lithium ion battery and the preparation method thereof can realize membrane preparation by adopting a method combining natural casting and roller coating, well achieve the aims of realizing mass production and reducing production cost, greatly simplify production procedures, save production cost, have low requirements on equipment and less investment, are not only suitable for small-batch fine machining, but also are suitable for mass production.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a polymer lithium ion battery and a preparation method thereof.
Background
According to the difference of electrolyte materials used by lithium ion batteries, the lithium ion batteries are divided into liquid lithium ion batteries and polymer lithium ion batteries or plastic lithium ion batteries, the positive and negative electrode materials used by the polymer lithium ion batteries are the same as liquid lithium ions, the main difference of the two batteries is that the liquid lithium ion batteries use liquid electrolytes, the polymer lithium ion batteries are replaced by solid polymer electrolytes, the polymer can be in a dry state or a colloidal state, the polymer lithium ion batteries have the characteristics of good safety performance, light weight, large capacity, small internal resistance and the like, the lithium ion batteries made of the polymer positive electrode materials use conductive polymers as positive electrode materials, the specific capacity is relatively increased, and the polymer lithium ion batteries have the advantages of thinness, low cost, high safety and the like compared with the liquid lithium ion batteries The polymer lithium ion battery can also adopt high molecules as a positive electrode material, the mass specific energy of the polymer lithium ion battery can be improved by more than 20 percent compared with the current liquid lithium ion battery, and the polymer lithium ion battery has the characteristics of miniaturization, thinness and light weight, so the market occupation of the polymer battery is gradually increased.
Most of the existing polymer lithium ion batteries are formed into films by a direct slit extrusion production method in the process of preparing isolation films, however, the preparation method is complex in production process, expensive in production cost and not suitable for mass production, the method of combining natural casting and roller coating for film preparation cannot be realized, the purposes of realizing mass production and reducing the production cost cannot be achieved, and therefore the method is very unfavorable for polymer lithium battery production enterprises.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a polymer lithium ion battery and a preparation method thereof, and solves the problems that the existing preparation method is complex in production process, expensive in production cost, not suitable for mass production, incapable of realizing membrane preparation by adopting a method combining natural casting and roller coating, and incapable of achieving the purposes of realizing mass production and reducing the production cost.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a polymer lithium ion battery comprises a positive pole piece, a negative pole piece, a polymerization isolation membrane and electrolyte, wherein the polymerization isolation membrane comprises the following raw materials in parts by weight: 10-20 parts of polyacrylonitrile, 10-20 parts of polyoxypropylene, 10-20 parts of polyvinyl chloride, 10-20 parts of polyvinylidene fluoride and 10-20 parts of binary copolymer of vinylidene fluoride and hexafluoropropylene.
Preferably, the polymeric isolating membrane comprises the following raw materials in parts by weight: 15 parts of polyacrylonitrile, 15 parts of polyoxypropylene, 15 parts of polyvinyl chloride, 15 parts of polyvinylidene fluoride and 15 parts of binary copolymer of vinylidene fluoride and hexafluoropropylene.
Preferably, the polymeric isolating membrane comprises the following raw materials in parts by weight: 10 parts of polyacrylonitrile, 10 parts of polyoxypropylene, 20 parts of polyvinyl chloride, 20 parts of polyvinylidene fluoride and 20 parts of binary copolymer of vinylidene fluoride and hexafluoropropylene.
Preferably, the polymeric isolating membrane comprises the following raw materials in parts by weight: 20 parts of polyacrylonitrile, 20 parts of polyoxypropylene, 10 parts of polyvinyl chloride, 10 parts of polyvinylidene fluoride and 10 parts of binary copolymer of vinylidene fluoride and hexafluoropropylene.
Preferably, the positive pole piece is one of lithium cobaltate, lithium manganate, ternary materials or lithium iron phosphate materials.
Preferably, the negative pole piece is prepared by mixing, pressing and molding graphite and a selenium-silicon composite material.
The invention also discloses a preparation method of the polymer lithium ion battery, which comprises the following steps:
s1, pulping: firstly, respectively measuring polyacrylonitrile, polyoxypropylene, polyvinyl chloride, polyvinylidene fluoride and binary copolymer of vinylidene fluoride and hexafluoropropylene in required weight ratio by using proportioning equipment, then putting the weighed substances into mixing equipment, respectively adding a solvent and an adhesive into the mixing equipment, and uniformly stirring at a rotating speed of 500 plus materials/600 r/min to obtain slurry;
s2, film making and slitting: connecting a stainless steel feeding tank storing the slurry in the step S1 with a steel cylinder filled with inert gas, controlling the outflow speed of the slurry by adjusting the pressure in the slurry tank, always keeping the amount of the slurry at the position including the knife edge constant, driving the slurry to form a film with certain thickness and width through the knife edge and the slit of the substrate by a substrate moving at a constant speed, then performing roll-in treatment on the film through a coating roller, drying the film through a drying tunnel, rolling the film, and adjusting the height of the slit of the knife edge to obtain films with different thicknesses;
s3, forming of the positive pole piece and the negative pole piece: selecting a positive electrode material and a negative electrode material, mixing and pressing the positive electrode material and the negative electrode material by forming equipment, machining the positive electrode material and the negative electrode material into a required shape by cutting equipment, and then cleaning and drying the positive electrode material and the negative electrode material to respectively manufacture positive and negative electrode plates;
s4, assembling: placing the positive pole piece, the diaphragm, the negative pole piece and the diaphragm from top to bottom in sequence, winding to prepare a battery pole core, injecting electrolyte, and sealing to finish the assembly process of the battery to prepare a finished battery;
s5, formation test: and (3) carrying out charge and discharge tests on the finished product batteries by using battery charge and discharge equipment, detecting each battery, screening out qualified finished product batteries, and leaving the factory for sale or warehousing for storage.
(III) advantageous effects
The invention provides a polymer lithium ion battery and a preparation method thereof. Compared with the prior art, the method has the following beneficial effects: the polymer lithium ion battery and the preparation method thereof comprise a positive pole piece, a negative pole piece, a polymerization isolating membrane and electrolyte, wherein the polymerization isolating membrane comprises the following raw materials in parts by weight: 10-20 parts of polyacrylonitrile, 10-20 parts of polyoxypropylene, 10-20 parts of polyvinyl chloride, 10-20 parts of polyvinylidene fluoride and 10-20 parts of binary copolymer of vinylidene fluoride and hexafluoropropylene, and the preparation method of the polymer lithium ion battery specifically comprises the following steps: s1, pulping: firstly, respectively measuring polyacrylonitrile, polyoxypropylene, polyvinyl chloride, polyvinylidene fluoride and binary copolymer of vinylidene fluoride and hexafluoropropylene in required weight ratio by using proportioning equipment, then putting the weighed substances into mixing equipment, respectively adding a solvent and an adhesive into the mixing equipment, uniformly stirring at a rotating speed of 500 plus materials and 600r/min to obtain slurry, and S2, preparing and cutting a membrane: connecting a stainless steel feeding tank storing the slurry in the step S1 with a steel cylinder filled with inert gas, controlling the outflow speed of the slurry by adjusting the pressure in the slurry tank, always keeping the amount of the slurry at the position of a knife edge constant, driving the slurry to form a film with certain thickness and width through the knife edge and a slit of a substrate by a substrate moving at a constant speed, then rolling the film through a coating roller, forming the slurry by natural casting, forming a battery isolation film in a short time by a rolling mode, meeting the required requirement, drying through a drying channel, rolling, adjusting the height of the knife edge slit, and obtaining films with different thicknesses, S3, forming a positive pole piece and a negative pole piece: selecting a positive electrode material and a negative electrode material, mixing and pressing the positive electrode material and the negative electrode material by forming equipment, machining the positive electrode material and the negative electrode material into a required shape by cutting equipment, then cleaning and drying the positive electrode material and the negative electrode material to respectively manufacture a positive electrode plate and a negative electrode plate, S4, assembling: placing the positive pole piece, the diaphragm, the negative pole piece and the diaphragm from top to bottom, winding to prepare a battery pole core, injecting electrolyte, and sealing to finish the assembly process of the battery, thus preparing a finished battery, and S5 formation testing: the finished product batteries are screened out to be qualified through the detection of each battery after the charging and discharging test of the battery charging and discharging equipment, and can be delivered for sale or stored in a warehouse.
Drawings
FIG. 1 is a flow chart of the preparation 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 embodiment of the present invention provides three technical solutions: a polymer lithium ion battery and a preparation method thereof specifically comprise the following embodiments:
example 1
A polymer lithium ion battery comprises a positive pole piece, a negative pole piece, a polymerization isolation membrane and electrolyte, wherein the polymerization isolation membrane comprises the following raw materials in parts by weight: 15 parts of polyacrylonitrile, 15 parts of polyoxypropylene, 15 parts of polyvinyl chloride, 15 parts of polyvinylidene fluoride and 15 parts of a binary copolymer of vinylidene fluoride and hexafluoropropylene, wherein the positive pole piece is one of lithium cobaltate, lithium manganate, a ternary material or a lithium iron phosphate material, and the negative pole piece is prepared by mixing, pressing and molding graphite and a selenium-silicon composite material.
A preparation method of a polymer lithium ion battery specifically comprises the following steps:
s1, pulping: firstly, respectively measuring polyacrylonitrile, polyoxypropylene, polyvinyl chloride, polyvinylidene fluoride and binary copolymer of vinylidene fluoride and hexafluoropropylene in required weight ratio by using proportioning equipment, then putting the weighed substances into mixing equipment, respectively adding a solvent and an adhesive into the mixing equipment, and uniformly stirring at a rotating speed of 550r/min to obtain slurry;
s2, film making and slitting: connecting a stainless steel feeding tank storing the slurry in the step S1 with a steel cylinder filled with inert gas, controlling the outflow speed of the slurry by adjusting the pressure in the slurry tank, always keeping the amount of the slurry at the position including the knife edge constant, driving the slurry to form a film with certain thickness and width through the knife edge and the slit of the substrate by a substrate moving at a constant speed, then performing roll-in treatment on the film through a coating roller, drying the film through a drying tunnel, rolling the film, and adjusting the height of the slit of the knife edge to obtain films with different thicknesses;
s3, forming of the positive pole piece and the negative pole piece: selecting a positive electrode material and a negative electrode material, mixing and pressing the positive electrode material and the negative electrode material by forming equipment, machining the positive electrode material and the negative electrode material into a required shape by cutting equipment, and then cleaning and drying the positive electrode material and the negative electrode material to respectively manufacture positive and negative electrode plates;
s4, assembling: placing the positive pole piece, the diaphragm, the negative pole piece and the diaphragm from top to bottom in sequence, winding to prepare a battery pole core, injecting electrolyte, and sealing to finish the assembly process of the battery to prepare a finished battery;
s5, formation test: and (3) carrying out charge and discharge tests on the finished product batteries by using battery charge and discharge equipment, detecting each battery, screening out qualified finished product batteries, and leaving the factory for sale or warehousing for storage.
Example 2
A polymer lithium ion battery comprises a positive pole piece, a negative pole piece, a polymerization isolation membrane and electrolyte, wherein the polymerization isolation membrane comprises the following raw materials in parts by weight: 10 parts of polyacrylonitrile, 10 parts of polyoxypropylene, 20 parts of polyvinyl chloride, 20 parts of polyvinylidene fluoride and 20 parts of binary copolymer of vinylidene fluoride and hexafluoropropylene, wherein the positive pole piece is one of lithium cobaltate, lithium manganate, ternary material or lithium iron phosphate material, and the negative pole piece is prepared by mixing, pressing and molding graphite and selenium-silicon composite material.
A preparation method of a polymer lithium ion battery specifically comprises the following steps:
s1, pulping: firstly, respectively measuring polyacrylonitrile, polyoxypropylene, polyvinyl chloride, polyvinylidene fluoride and binary copolymer of vinylidene fluoride and hexafluoropropylene in required weight ratio by using proportioning equipment, then putting the weighed substances into mixing equipment, respectively adding a solvent and an adhesive into the mixing equipment, and uniformly stirring at a rotating speed of 500r/min to obtain slurry;
s2, film making and slitting: connecting a stainless steel feeding tank storing the slurry in the step S1 with a steel cylinder filled with inert gas, controlling the outflow speed of the slurry by adjusting the pressure in the slurry tank, always keeping the amount of the slurry at the position including the knife edge constant, driving the slurry to form a film with certain thickness and width through the knife edge and the slit of the substrate by a substrate moving at a constant speed, then performing roll-in treatment on the film through a coating roller, drying the film through a drying tunnel, rolling the film, and adjusting the height of the slit of the knife edge to obtain films with different thicknesses;
s3, forming of the positive pole piece and the negative pole piece: selecting a positive electrode material and a negative electrode material, mixing and pressing the positive electrode material and the negative electrode material by forming equipment, machining the positive electrode material and the negative electrode material into a required shape by cutting equipment, and then cleaning and drying the positive electrode material and the negative electrode material to respectively manufacture positive and negative electrode plates;
s4, assembling: placing the positive pole piece, the diaphragm, the negative pole piece and the diaphragm from top to bottom in sequence, winding to prepare a battery pole core, injecting electrolyte, and sealing to finish the assembly process of the battery to prepare a finished battery;
s5, formation test: and (3) carrying out charge and discharge tests on the finished product batteries by using battery charge and discharge equipment, detecting each battery, screening out qualified finished product batteries, and leaving the factory for sale or warehousing for storage.
Example 3
A polymer lithium ion battery comprises a positive pole piece, a negative pole piece, a polymerization isolation membrane and electrolyte, wherein the polymerization isolation membrane comprises the following raw materials in parts by weight: the lithium ion battery comprises, by weight, 20 parts of polyacrylonitrile, 20 parts of polyoxypropylene, 10 parts of polyvinyl chloride, 10 parts of polyvinylidene fluoride and 10 parts of a binary copolymer of vinylidene fluoride and hexafluoropropylene, wherein a positive pole piece is one of lithium cobaltate, lithium manganate, a ternary material or a lithium iron phosphate material, and a negative pole piece is prepared by mixing, pressing and molding graphite and a selenium-silicon composite material.
A preparation method of a polymer lithium ion battery specifically comprises the following steps:
s1, pulping: firstly, respectively measuring polyacrylonitrile, polyoxypropylene, polyvinyl chloride, polyvinylidene fluoride and binary copolymer of vinylidene fluoride and hexafluoropropylene in required weight ratio by using proportioning equipment, then putting the weighed substances into mixing equipment, respectively adding a solvent and an adhesive into the mixing equipment, and uniformly stirring at a rotating speed of 600r/min to obtain slurry;
s2, film making and slitting: connecting a stainless steel feeding tank storing the slurry in the step S1 with a steel cylinder filled with inert gas, controlling the outflow speed of the slurry by adjusting the pressure in the slurry tank, always keeping the amount of the slurry at the position including the knife edge constant, driving the slurry to form a film with certain thickness and width through the knife edge and the slit of the substrate by a substrate moving at a constant speed, then performing roll-in treatment on the film through a coating roller, drying the film through a drying tunnel, rolling the film, and adjusting the height of the slit of the knife edge to obtain films with different thicknesses;
s3, forming of the positive pole piece and the negative pole piece: selecting a positive electrode material and a negative electrode material, mixing and pressing the positive electrode material and the negative electrode material by forming equipment, machining the positive electrode material and the negative electrode material into a required shape by cutting equipment, and then cleaning and drying the positive electrode material and the negative electrode material to respectively manufacture positive and negative electrode plates;
s4, assembling: placing the positive pole piece, the diaphragm, the negative pole piece and the diaphragm from top to bottom in sequence, winding to prepare a battery pole core, injecting electrolyte, and sealing to finish the assembly process of the battery to prepare a finished battery;
s5, formation test: and (3) carrying out charge and discharge tests on the finished product batteries by using battery charge and discharge equipment, detecting each battery, screening out qualified finished product batteries, and leaving the factory for sale or warehousing for storage.
Comparative experiment
A certain lithium battery manufacturing enterprise respectively completes the production of the lithium batteries in the same batch by using the preparation method of the embodiment 1-3 of the invention, records the total working hours for completing the production of each group in the production process, and simultaneously extracts the total working hour data required by the conventional production of the lithium batteries in the same batch as a comparison group, and the results are shown in table 1.
TABLE 1 data sheet of comparative experiments
As can be seen from table 1, the total working hours for producing the lithium batteries in the same batch by using the preparation method of example 1 are the shortest, all the examples 1 are the best production schemes, and the total working hours for producing the lithium batteries in the same batch by using the production methods of examples 2 and 3 are all compared with those of the control group, so that the invention can realize membrane preparation by using a method combining natural casting and roller coating, well achieve the purposes of realizing mass production and reducing production cost, greatly simplify the production process, save the production cost, have lower requirements on equipment and less investment, are not only suitable for small-batch fine machining, but also suitable for mass production, and are very beneficial to the production enterprises of polymer lithium batteries.
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.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A polymer lithium ion battery, characterized in that: the polymer lithium ion battery comprises a positive pole piece, a negative pole piece, a polymer isolating membrane and electrolyte, wherein the polymer isolating membrane comprises the following raw materials in parts by weight: 10-20 parts of polyacrylonitrile, 10-20 parts of polyoxypropylene, 10-20 parts of polyvinyl chloride, 10-20 parts of polyvinylidene fluoride and 10-20 parts of binary copolymer of vinylidene fluoride and hexafluoropropylene.
2. The polymer lithium ion battery of claim 1, wherein: the polymeric isolating membrane comprises the following raw materials in parts by weight: 15 parts of polyacrylonitrile, 15 parts of polyoxypropylene, 15 parts of polyvinyl chloride, 15 parts of polyvinylidene fluoride and 15 parts of binary copolymer of vinylidene fluoride and hexafluoropropylene.
3. The polymer lithium ion battery of claim 1, wherein: the polymeric isolating membrane comprises the following raw materials in parts by weight: 10 parts of polyacrylonitrile, 10 parts of polyoxypropylene, 20 parts of polyvinyl chloride, 20 parts of polyvinylidene fluoride and 20 parts of binary copolymer of vinylidene fluoride and hexafluoropropylene.
4. The polymer lithium ion battery of claim 1, wherein: the polymeric isolating membrane comprises the following raw materials in parts by weight: 20 parts of polyacrylonitrile, 20 parts of polyoxypropylene, 10 parts of polyvinyl chloride, 10 parts of polyvinylidene fluoride and 10 parts of binary copolymer of vinylidene fluoride and hexafluoropropylene.
5. The polymer lithium ion battery of claim 1, wherein: the positive pole piece is one of lithium cobaltate, lithium manganate, ternary materials or lithium iron phosphate materials.
6. The polymer lithium ion battery of claim 1, wherein: the negative pole piece is prepared by mixing, pressing and molding graphite and a selenium-silicon composite material.
7. A method for preparing a polymer lithium ion battery according to any one of claims 1 to 6, characterized in that: the method specifically comprises the following steps:
s1, pulping: firstly, respectively measuring polyacrylonitrile, polyoxypropylene, polyvinyl chloride, polyvinylidene fluoride and binary copolymer of vinylidene fluoride and hexafluoropropylene in required weight ratio by using proportioning equipment, then putting the weighed substances into mixing equipment, respectively adding a solvent and an adhesive into the mixing equipment, and uniformly stirring at a rotating speed of 500 plus materials/600 r/min to obtain slurry;
s2, film making and slitting: connecting a stainless steel feeding tank storing the slurry in the step S1 with a steel cylinder filled with inert gas, controlling the outflow speed of the slurry by adjusting the pressure in the slurry tank, always keeping the amount of the slurry at the position including the knife edge constant, driving the slurry to form a film with certain thickness and width through the knife edge and the slit of the substrate by a substrate moving at a constant speed, then performing roll-in treatment on the film through a coating roller, drying the film through a drying tunnel, rolling the film, and adjusting the height of the slit of the knife edge to obtain films with different thicknesses;
s3, forming of the positive pole piece and the negative pole piece: selecting a positive electrode material and a negative electrode material, mixing and pressing the positive electrode material and the negative electrode material by forming equipment, machining the positive electrode material and the negative electrode material into a required shape by cutting equipment, and then cleaning and drying the positive electrode material and the negative electrode material to respectively manufacture positive and negative electrode plates;
s4, assembling: placing the positive pole piece, the diaphragm, the negative pole piece and the diaphragm from top to bottom in sequence, winding to prepare a battery pole core, injecting electrolyte, and sealing to finish the assembly process of the battery to prepare a finished battery;
s5, formation test: and (3) carrying out charge and discharge tests on the finished product batteries by using battery charge and discharge equipment, detecting each battery, screening out qualified finished product batteries, and leaving the factory for sale or warehousing for storage.
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Application publication date: 20200327 |