CN114006050A - Ultra-thin polymer lithium ion battery and preparation method thereof - Google Patents

Ultra-thin polymer lithium ion battery and preparation method thereof Download PDF

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Publication number
CN114006050A
CN114006050A CN202111154602.9A CN202111154602A CN114006050A CN 114006050 A CN114006050 A CN 114006050A CN 202111154602 A CN202111154602 A CN 202111154602A CN 114006050 A CN114006050 A CN 114006050A
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polyethylene
negative electrode
battery
positive electrode
polypropylene diaphragm
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CN202111154602.9A
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Chinese (zh)
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林丰川
高国鹏
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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
    • 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
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621—Binders
    • H01M4/622—Binders being polymers
    • 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
    • H01M4/64—Carriers or collectors
    • 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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to the technical field of lithium ion batteries, and discloses an ultra-thin polymer lithium ion battery and a preparation method thereof, wherein the ultra-thin polymer lithium ion battery comprises a positive electrode composite element, a negative electrode composite element, a polyethylene-polypropylene diaphragm bonding element and a shell element; the battery core is formed by sequentially stacking a polyethylene-polypropylene diaphragm bonding element, a negative electrode composite element, a polyethylene-polypropylene diaphragm bonding element, a positive electrode composite element, a polyethylene-polypropylene diaphragm bonding element, a negative electrode composite element and a polyethylene-polypropylene diaphragm bonding element, and the battery core is wrapped by a shell element after being hot-pressed to form the battery. Compared with the traditional battery in which the positive and negative pole pieces are coated on the current collector on two sides, the battery saves the thickness space of the two single-sided negative pole pieces. The thickness of the laminated battery manufactured in the way can be 0.5 mm at the minimum, and the application space of the battery is greatly expanded.

Description

Ultra-thin polymer lithium ion battery and preparation method thereof
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to an ultrathin polymer lithium ion battery and a preparation method thereof.
Background
Modern society has developed information, and various information cards such as magnetic cards, smart cards (IC cards), identification cards (ID cards), bank cards, radio frequency cards (electronic tags, RFID), electronic paper, and the like have come into play. The prior card has no power supply, small information quantity and poor confidentiality. In order to improve the information content and the security of the card, the card with a power supply needs to be developed, and therefore, a demand for an ultra-thin battery is raised.
The lithium battery of the card-type electronic product is generally thin in thickness according to the requirements of the application field. The minimum thickness of the existing polymer flexible package lithium ion secondary battery is more than 3mm, so that the use requirement of card type electronic products is difficult to meet. Meanwhile, the existing mobile phones, notebook computers, tablet computers and other devices also have the requirement of thinning. The thickness of the battery needs to be controlled below 3mm, and the extreme use scene even needs to be controlled to be about 0.5 mm.
Based on the above situation, it is highly desirable to develop an ultra-thin polymer lithium ion battery and a method for preparing the same.
Disclosure of Invention
In view of the above problems, the present invention is directed to an ultra-thin polymer lithium ion battery and a method for manufacturing the same. Compared with the traditional battery in which the positive and negative pole pieces are coated on the current collector on two sides, the battery saves the thickness space of the two single-sided negative pole pieces. The thickness of the laminated battery manufactured in the way can be 0.5 mm at the minimum, and the application space of the battery is greatly expanded.
In order to achieve the purpose, the invention adopts the following technical scheme:
an ultra-thin polymer lithium ion battery comprises a positive electrode composite element, a negative electrode composite element, a polyethylene-polypropylene diaphragm bonding element and a shell element; the positive electrode composite element comprises a positive electrode current collector and a positive electrode slurry layer coated on the two sides of the positive electrode current collector; the negative electrode composite element comprises a negative electrode current collector and a negative electrode slurry layer coated on one side of the outermost side of the negative electrode current collector; the polyethylene-polypropylene diaphragm bonding element comprises a polyethylene-polypropylene diaphragm and a high polymer bonding agent layer coated on the two sides of the polyethylene-polypropylene diaphragm;
the battery is characterized in that a battery core is formed by a polyethylene-polypropylene diaphragm bonding element, a negative electrode composite element, a polyethylene-polypropylene diaphragm bonding element, a positive electrode composite element, a polyethylene-polypropylene diaphragm bonding element, a negative electrode composite element and a polyethylene-polypropylene diaphragm bonding element which are sequentially stacked, and the battery core is wrapped by a shell element after being hot-pressed to form the battery.
Preferably, the housing element comprises, in order from the inside outwards, a multilayer polyethylene film, an aluminium foil, a polypropylene film and a polyamide film.
Preferably, the thickness of the shell element is 0.05-0.15 mm.
Preferably, the positive current collector is an aluminum foil, the thickness of the aluminum foil is 0.01-0.015 mm, the thickness of the positive slurry layer is 0.06mm,
preferably, the positive electrode slurry layer comprises an active material, a conductive agent and a binder in a mass ratio of 94:3:3, wherein the active material is one or a combination of lithium cobaltate, multiple lithium, lithium manganate and lithium iron phosphate.
Preferably, the negative current collector is a copper foil, the thickness of the copper foil is 0.006-0.01 mm, and the thickness of the negative slurry layer is 0.05 mm.
Preferably, the negative electrode slurry layer comprises graphite powder, a conductive agent and a binder in a mass ratio of 95:1: 4.
Preferably, the polymer binder layer comprises polyvinylidene fluoride and aluminum oxide in a mass ratio of 3: 7.
Preferably, the thickness of the polymeric binder layer is less than 1 micron.
The invention also discloses a preparation method of the ultrathin polymer lithium ion battery, which comprises the following steps:
(1) coating the two sides of the positive electrode slurry on a positive electrode current collector to prepare a positive electrode composite element; coating one side of the negative electrode slurry on the outermost side of the negative electrode current collector to obtain a negative electrode composite element; coating the two sides of a high-molecular adhesive on a polyethylene-polypropylene diaphragm to prepare a polyethylene-polypropylene diaphragm adhesive element;
(2) sequentially stacking a polyethylene-polypropylene diaphragm bonding element, a negative electrode composite element, a polyethylene-polypropylene diaphragm bonding element, a positive electrode composite element, a polyethylene-polypropylene diaphragm bonding element, a negative electrode composite element and a polyethylene-polypropylene diaphragm bonding element to form a battery core, and putting the stacked battery core on a hot press for hot press molding;
(3) and packaging the hot-pressed battery core by using a shell element to form the battery.
Preferably, the battery core is placed on a hot press for hot pressing for 15 seconds for shaping, the hot pressing temperature is 60 ℃, and the pressure is 1 kgf.
Compared with the prior art, the invention has the following beneficial effects:
compared with the traditional battery in which the positive and negative pole pieces are coated on the current collector on two sides, the battery saves the thickness space of the two single-side negative pole pieces and can effectively reduce the thickness of the battery. The battery core is formed by connecting two anode single sheets and two cathode single sheets in parallel, the thinnest can be 0.5 mm, and the application space of the battery is greatly expanded.
The polyethylene-polypropylene diaphragm bonding element in the battery adopts a mode of coating a diaphragm with a bonding agent. After hot pressing, the negative electrode composite element, the positive electrode composite element and the diaphragm are bonded together, so that the strength of the battery core is improved, separation layers are not prone to occurring between the positive electrode, the negative electrode and the diaphragm, and the problems that the strength is not enough due to the fact that the battery core is too thin, separation layers are prone to occurring between the positive electrode, the negative electrode and the diaphragm, and the electrical performance is reduced are solved.
Drawings
FIG. 1 is a schematic cross-sectional view of an ultra-thin polymer lithium ion battery of the present invention;
FIG. 2 is a schematic cross-sectional view of a battery cell of an ultra-thin polymer lithium ion battery according to the present invention;
FIG. 3 is a schematic cross-sectional view of a positive electrode composite component of an ultra-thin polymer lithium ion battery according to the present invention;
FIG. 4 is a schematic cross-sectional view of a negative electrode composite component of an ultra-thin polymer lithium ion battery according to the present invention;
fig. 5 is a schematic cross-sectional structure diagram of a polyethylene-polypropylene separator bonding element of an ultra-thin polymer lithium ion battery according to the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
Referring to fig. 1 to 5, the ultra-thin polymer lithium ion battery of the present invention adopts a stacked structure, and includes a positive electrode composite element 1, a negative electrode composite element 2, a polyethylene-polypropylene separator bonding element 3, and a case element 4. The battery core is formed by sequentially stacking a polyethylene-polypropylene diaphragm bonding element 3, a negative electrode composite element 2, a polyethylene-polypropylene diaphragm bonding element 3, a positive electrode composite element 1, a polyethylene-polypropylene diaphragm bonding element 3, a negative electrode composite element 2 and a polyethylene-polypropylene diaphragm bonding element 3, and the battery core is wrapped by a shell element 4 to form the battery.
Manufacturing a positive electrode composite element:
as shown in fig. 3, the positive electrode composite device 1 includes a positive electrode collector 11 and a positive electrode slurry layer 12 coated on both sides thereof. The positive electrode slurry layer 12 is formed by applying a positive electrode slurry on both sides of a positive electrode current collector by a coater. The positive current collector 11 is an aluminum foil, and the thickness of the aluminum foil is 0.01-0.015 mm. The positive electrode slurry layer 12 includes an active material, a conductive agent, and a binder at a mass ratio of 94:3: 3. Wherein, the active material is one or the combination of lithium cobaltate, multi-element lithium, lithium manganate and lithium iron phosphate. The thickness of the positive electrode slurry layer 12 was 0.06 mm.
The positive electrode slurry layer may also adopt the positive electrode slurry of the prior art.
Manufacturing a negative electrode composite element:
as shown in fig. 4, the negative electrode composite member 2 includes a negative electrode current collector 21 and a negative electrode slurry layer 22 coated on one side of the outermost side thereof (the outermost side refers to the position thereof when it is located in the battery cell). The negative electrode slurry layer 22 is formed by applying a negative electrode slurry to a negative electrode current collector on one side by a coater. The negative current collector 21 is a copper foil, and the thickness of the copper foil is 0.006-0.01. The anode slurry layer 22 includes graphite powder, a conductive agent, and a binder at a mass ratio of 95:1: 4. The thickness of the anode slurry layer 22 was 0.05 mm.
The negative electrode slurry layer may also adopt the negative electrode slurry of the prior art.
Polyethylene-polypropylene separator bonding element:
as shown in fig. 5, the polyethylene-polypropylene separator adhesive member 3 includes a polyethylene-polypropylene separator 31 and a polymer adhesive layer 32 coated on both sides thereof. The polymer binder layer 32 includes polyvinylidene fluoride and alumina at a mass ratio of 3: 7. A polymeric binder layer 32. The polymeric binder layer 32 is less than 1 micron thick.
A housing element:
the shell element sequentially comprises a plurality of layers of polyethylene films, aluminum foils, polypropylene films and polyamide films from inside to outside. The thickness of the shell element is 0.05-0.15 mm.
The preparation method of the ultrathin polymer lithium ion battery comprises the following steps:
(1) coating the two sides of the positive electrode slurry on a positive electrode current collector to prepare a positive electrode composite element; coating one side of the negative electrode slurry on the outermost side of the negative electrode current collector to obtain a negative electrode composite element; coating the two sides of a high-molecular adhesive on a polyethylene-polypropylene diaphragm to prepare a polyethylene-polypropylene diaphragm adhesive element;
(2) sequentially stacking a polyethylene-polypropylene diaphragm bonding element, a negative electrode composite element, a polyethylene-polypropylene diaphragm bonding element, a positive electrode composite element, a polyethylene-polypropylene diaphragm bonding element, a negative electrode composite element and a polyethylene-polypropylene diaphragm bonding element to form a battery core, and putting the stacked battery core on a hot press for hot press molding;
(3) and packaging the hot-pressed battery core by using a shell element to form the battery.
Preferably, the battery core is placed on a hot press for hot pressing for 15 seconds for shaping, the hot pressing temperature is 60 ℃, and the pressure is 1 kgf.
Compared with the traditional battery in which the positive and negative pole pieces are coated on the current collector on two sides, the battery saves the thickness space of the two single-side negative pole pieces and can effectively reduce the thickness of the battery. The battery core is formed by connecting two anode single sheets and two cathode single sheets in parallel, the thinnest can be 0.5 mm, and the application space of the battery is greatly expanded.
The polyethylene-polypropylene diaphragm bonding element in the battery adopts a mode of coating a diaphragm with a bonding agent. After hot pressing, the negative electrode composite element, the positive electrode composite element and the diaphragm are bonded together, so that the strength of the battery core is improved, separation layers are not prone to occurring between the positive electrode, the negative electrode and the diaphragm, and the problems that the strength is not enough due to the fact that the battery core is too thin, separation layers are prone to occurring between the positive electrode, the negative electrode and the diaphragm, and the electrical performance is reduced are solved.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.

Claims (10)

1. An ultra-thin polymer lithium ion battery is characterized by comprising a positive electrode composite element, a negative electrode composite element, a polyethylene-polypropylene diaphragm bonding element and a shell element; the positive electrode composite element comprises a positive electrode current collector and a positive electrode slurry layer coated on the two sides of the positive electrode current collector; the negative electrode composite element comprises a negative electrode current collector and a negative electrode slurry layer coated on one side of the outermost side of the negative electrode current collector; the polyethylene-polypropylene diaphragm bonding element comprises a polyethylene-polypropylene diaphragm and a high polymer bonding agent layer coated on the two sides of the polyethylene-polypropylene diaphragm;
the battery is characterized in that a battery core is formed by a polyethylene-polypropylene diaphragm bonding element, a negative electrode composite element, a polyethylene-polypropylene diaphragm bonding element, a positive electrode composite element, a polyethylene-polypropylene diaphragm bonding element, a negative electrode composite element and a polyethylene-polypropylene diaphragm bonding element which are sequentially stacked, and the battery core is wrapped by a shell element after being hot-pressed to form the battery.
2. The ultra-thin polymer lithium ion battery of claim 1, wherein the housing element comprises a plurality of polyethylene films, aluminum foils, polypropylene films and polyamide films in sequence from inside to outside.
3. The ultra-thin polymer lithium ion battery of claim 1, wherein the thickness of the housing element is 0.05-0.15 mm.
4. The ultra-thin polymer lithium ion battery of claim 1, wherein the positive electrode current collector is an aluminum foil, the aluminum foil has a thickness of 0.01-0.015 mm, and the positive electrode slurry layer has a thickness of 0.06 mm.
5. The ultra-thin polymer lithium ion battery of claim 1, wherein the positive slurry layer comprises an active material, a conductive agent and a binder in a mass ratio of 94:3:3, and the active material is one or a combination of lithium cobaltate, lithium polynide, lithium manganate and lithium iron phosphate.
6. The ultra-thin polymer lithium ion battery of claim 1, wherein the negative current collector is a copper foil, the copper foil has a thickness of 0.006-0.01 mm, and the negative slurry layer has a thickness of 0.05 mm.
7. The ultra-thin polymer lithium ion battery of claim 1, wherein the negative electrode slurry layer comprises graphite powder, a conductive agent and a binder in a mass ratio of 95:1: 4.
8. The ultra-thin type polymer lithium ion battery of claim 1, wherein the polymer binder layer comprises polyvinylidene fluoride and aluminum oxide in a mass ratio of 3: 7.
9. The ultra-thin type polymer lithium ion battery of claim 1, wherein the thickness of the polymer binder layer is less than 1 μm.
10. The preparation method of the ultrathin polymer lithium ion battery as claimed in any one of claims 1 to 9, characterized by comprising the following steps:
(1) coating the two sides of the positive electrode slurry on a positive electrode current collector to prepare a positive electrode composite element; coating one side of the negative electrode slurry on the outermost side of the negative electrode current collector to obtain a negative electrode composite element; coating the two sides of a high-molecular adhesive on a polyethylene-polypropylene diaphragm to prepare a polyethylene-polypropylene diaphragm adhesive element;
(2) sequentially stacking a polyethylene-polypropylene diaphragm bonding element, a negative electrode composite element, a polyethylene-polypropylene diaphragm bonding element, a positive electrode composite element, a polyethylene-polypropylene diaphragm bonding element, a negative electrode composite element and a polyethylene-polypropylene diaphragm bonding element to form a battery core, and putting the stacked battery core on a hot press for hot press molding;
(3) and packaging the hot-pressed battery core by using a shell element to form the battery.
CN202111154602.9A 2021-09-29 2021-09-29 Ultra-thin polymer lithium ion battery and preparation method thereof Pending CN114006050A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115513602A (en) * 2022-10-21 2022-12-23 武汉中金泰富新能源科技有限公司 Manufacturing process of power battery containing electrode with interface management layer structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115513602A (en) * 2022-10-21 2022-12-23 武汉中金泰富新能源科技有限公司 Manufacturing process of power battery containing electrode with interface management layer structure
CN115513602B (en) * 2022-10-21 2024-01-26 武汉中金泰富新能源科技有限公司 Manufacturing process of power battery containing interface management layer structure electrode

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