CN112864450A - Lithium ion battery and preparation method thereof - Google Patents
Lithium ion battery and preparation method thereof Download PDFInfo
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- CN112864450A CN112864450A CN202110046189.8A CN202110046189A CN112864450A CN 112864450 A CN112864450 A CN 112864450A CN 202110046189 A CN202110046189 A CN 202110046189A CN 112864450 A CN112864450 A CN 112864450A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims description 4
- 239000006258 conductive agent Substances 0.000 claims abstract description 20
- 239000011883 electrode binding agent Substances 0.000 claims abstract description 19
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 238000007731 hot pressing Methods 0.000 claims abstract description 12
- 239000007773 negative electrode material Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims abstract description 10
- 239000007774 positive electrode material Substances 0.000 claims abstract description 9
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 8
- 239000011267 electrode slurry Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000005056 compaction Methods 0.000 claims abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000011889 copper foil Substances 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000010030 laminating Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000002985 plastic film Substances 0.000 claims description 4
- 229920006255 plastic film Polymers 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000006256 anode slurry Substances 0.000 claims description 2
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims 3
- 230000001070 adhesive effect Effects 0.000 claims 3
- 238000003475 lamination Methods 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 abstract description 6
- 230000014759 maintenance of location Effects 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 239000011230 binding agent Substances 0.000 description 3
- 238000010073 coating (rubber) Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
-
- 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
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- 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
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- 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)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention belongs to the technical field of lithium ions, and particularly relates to a lithium ion battery, wherein a positive plate, a negative plate and a diaphragm are laminated in a Z shape, and the lithium ion battery is formed by hot pressing and assembling, wherein the positive plate comprises positive slurry, and the positive slurry comprises the following components in percentage: 93-96 wt% of positive electrode active material, 2-3 wt% of conductive agent and 2-4 wt% of positive electrode binder; the negative plate comprises negative electrode slurry, and the negative electrode slurry comprises the following components in percentage: 94.5-96.5 wt% of negative electrode active material, 1-2 wt% of conductive agent and 2.5-3.5 wt% of negative electrode binder. The invention reduces the surface density and the compaction density of the coating of the positive and negative electrodes, carries out hot pressing on the gluing diaphragm, increases the wettability and the liquid retention of the positive and negative electrodes and the diaphragm to the electrolyte, ensures that the lithium iron phosphate battery keeps a liquid-rich state in the long-term circulation process, and prolongs the cycle life of the lithium iron phosphate battery.
Description
Technical Field
The invention belongs to the technical field of lithium ions, and particularly relates to a lithium ion battery and a preparation method thereof.
Background
Lithium iron phosphate batteries are favored by lithium battery experts all over the world due to the advantages of safety, reliability, long cycle life, stable discharge platform, low cost of lithium iron phosphate raw materials, environmental friendliness and the like, and are rapidly developed in recent years. Despite such great advantages, lithium iron phosphate batteries still have many disadvantages in practical applications, one of the most prominent problems is: the cycle life of the battery can not meet the target requirement, and the service life of the current lithium iron phosphate single battery is only about 3000 circles. During long-term cyclic charge and discharge, the electrolyte can be irreversibly consumed, and the capacity can be quickly attenuated and even the water can jump due to the lack of the electrolyte. Therefore, in the aspect of battery design, how to realize that the inside of the lithium iron phosphate battery has enough electrolyte all the time in the charging and discharging recycling process is realized, the cycle life of the lithium iron phosphate battery is prolonged, and the technical problem of industry is solved.
Disclosure of Invention
Aiming at the problems of short cycle life and insufficient electrolyte after the lithium iron phosphate battery is cycled, the invention aims to provide a method for prolonging the cycle life of the lithium iron phosphate battery.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a lithium ion battery comprises a positive plate, a negative plate and a diaphragm, wherein the positive plate, the negative plate and the diaphragm are laminated in a Z shape, and the lithium ion battery is formed after hot pressing and assembling;
the positive plate comprises a positive current collector and positive slurry coated on the positive current collector, wherein the positive slurry comprises the following components in percentage: 93-96 wt% of positive electrode active material, 2-3 wt% of conductive agent and 2-4 wt% of positive electrode binder;
the negative plate comprises a negative current collector and negative slurry coated on the negative current collector, wherein the negative slurry comprises the following components in percentage: 94.5-96.5 wt% of negative electrode active material, 1-2 wt% of conductive agent and 2.5-3.5 wt% of negative electrode binder.
Preferably, the positive active material is lithium iron phosphate, and the average particle size of the lithium iron phosphate is 0.5-1.0 um; the negative active material is graphite.
Preferably, the conductive agent is selected from one or more of SP, KS-6 and CNT; the positive electrode binder is PVDF, and the positive electrode solvent is NMP; the negative electrode binder is CMC and SBR, and the negative electrode solvent is deionized water.
Preferably, the diaphragm is two-sided rubber coating diaphragm, including base film and rubber coating, the thickness of base film is 12 ~ 16um, the thickness of rubber coating is 2 ~ 4 um.
Based on one general inventive concept, another object of the present invention is to provide a method for preparing the above lithium ion battery, including the steps of:
s1, preparing a positive plate: according to the weight ratio of 93-96 wt% to 2-3 wt%: weighing 2-4 wt% of a positive electrode active material, a conductive agent and a positive electrode binder, and mixing with a positive electrode solvent to obtain positive electrode slurry;
coating the uniformly dispersed anode slurry on an aluminum foil, drying, rolling, slitting and die cutting to obtain the anode plate;
s2, preparing a negative plate: weighing a negative electrode active material, a conductive agent and a negative electrode binder according to the percentage of 94.5-96.5 wt% to 1-2 wt% to 2.5-3.5 wt%, and mixing the negative electrode active material, the conductive agent and the negative electrode binder with a negative electrode solvent to obtain negative electrode slurry;
coating the uniformly dispersed negative electrode slurry on a copper foil, drying, rolling, slitting and die cutting to obtain a negative electrode sheet;
and S3, laminating the S1 positive plate, the S2 negative plate and the double-sided gluing diaphragm in a Z shape, carrying out hot pressing on the laminated battery cell, placing the hot-pressed battery cell in an aluminum plastic film, and carrying out liquid injection, formation and capacity grading to obtain the lithium ion battery.
Preferably, the density of the two sides of the positive plate is 280-320 g/m2The double-sided surface density of the negative plate is
140～160g/m2The compaction density of the positive plate is 2.20-2.40 g/cm3The compacted density of the negative plate is 1.48-1.52 g/cm3。
Preferably, the number of layers of the zigzag laminated positive plate is as follows: 27-29 layers, and 30-32 layers of negative electrode sheets.
Preferably, the parameters of the hot pressing process are: the temperature is 90-100 ℃, and the pressure is 3-5 kg/cm2And the time is 60-120 s.
Compared with the prior art, the invention reduces the surface density and the compacted density of the positive electrode coating and the negative electrode coating by optimizing the design of the battery cell, and hot presses the gluing diaphragm, thereby increasing the wettability and the liquid retention of the positive electrode plate, the negative electrode plate and the diaphragm to the electrolyte, ensuring that the lithium iron phosphate battery keeps a liquid-rich state in a long-term circulation process and prolonging the cycle life of the lithium iron phosphate battery.
Drawings
FIG. 1 is a schematic diagram of the cycle life of a lithium ion battery of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below:
example 1
Lithium iron phosphate (D) as a positive electrode active material500.55um), a conductive agent SP, a conductive agent CNT and a positive electrode binder PVDF are weighed according to the weight ratio of 95:1:1:3, and are coated on a 12um aluminum foil after being homogenized, and the density of the double-sided coating surface is 300g/m2Compacted density 2.25g/cm3Slitting and die cutting to obtain a positive plate;
weighing the negative electrode active material graphite, the conductive agent SP, the negative electrode binder CMC and the negative electrode binder SBR according to the weight ratio of 95.5:1:1.5:2, homogenizing, coating on a copper foil with the thickness of 4.5um, and coating the copper foil with the density of 150g/m on the double-sided coating surface2Compacted density 1.50g/cm3Slitting and die cutting to obtain a negative plate;
the obtained positive plate and the negative plate are processed,laminating the laminated cell in a Z shape by using a gluing diaphragm with the base film thickness of 12um and the double-faced gluing layer thickness of 2um, 29 layers of positive plates and 30 layers of negative plates, and carrying out hot pressing on the laminated cell at the hot pressing temperature of 95 ℃ and the pressure of 5kg/cm2And (5) placing the hot-pressed laminated core in an aluminum plastic film for 100S, and carrying out liquid injection, formation and capacity grading to obtain the lithium ion battery.
The obtained lithium ion battery is charged and discharged at 1C under the normal temperature state, the voltage interval is 3.6-2.8V, the cycle lasts for 8500 weeks, and the capacity retention rate is 82%.
Example 2
Lithium iron phosphate (D) as a positive electrode active material501um), conductive agent SP, conductive agent CNT and positive pole binder PVDF are weighed according to the weight ratio of 94.5:1:1.5:3, and are coated on a 12um aluminum foil after being homogenized, and the density of the double-side coating surface is 280g/m2Compacted density 2.25g/cm3Slitting and die cutting to obtain a positive plate;
weighing graphite serving as a negative active material, a conductive agent SP, a negative binder CMC and a negative binder SBR according to a weight ratio of 95:1.5:1.5:2, homogenizing, coating on a copper foil with the thickness of 4.5um, and coating the copper foil with the surface density of 140g/m on two surfaces2Compacted density 1.50g/cm3Slitting and die cutting to obtain a negative plate;
laminating the obtained positive plate and negative plate in a Z shape by using a gluing diaphragm with the base film thickness of 12um and the double-sided gluing layer thickness of 2um, laminating the laminated battery cell by using 30 layers of the positive plate and 31 layers of the negative plate, and carrying out hot pressing on the laminated battery cell at the hot pressing temperature of 90 ℃ and the pressure of 5kg/cm2And at the time of 120S, placing the hot-pressed laminated core in an aluminum plastic film, and carrying out liquid injection, formation and capacity grading to obtain the lithium ion battery.
The obtained lithium ion battery is charged and discharged at 1C under the normal temperature state, the voltage interval is 3.6-2.8V, the cycle is 8350 weeks, and the capacity retention rate is 83%.
The above embodiments are merely preferred embodiments of the present invention, and any simple modification, modification and substitution changes made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (8)
1. A lithium ion battery is characterized by comprising a positive plate, a negative plate and a diaphragm, wherein the positive plate, the negative plate and the diaphragm are laminated in a Z shape, and the lithium ion battery is formed after hot pressing and assembling;
the positive plate comprises a positive current collector and positive slurry coated on the positive current collector, wherein the positive slurry comprises the following components in percentage: 93-96 wt% of positive electrode active material, 2-3 wt% of conductive agent and 2-4 wt% of positive electrode binder;
the negative plate comprises a negative current collector and negative slurry coated on the negative current collector, wherein the negative slurry comprises the following components in percentage: 94.5-96.5 wt% of negative electrode active material, 1-2 wt% of conductive agent and 2.5-3.5 wt% of negative electrode binder.
2. The lithium ion battery according to claim 1, wherein the positive electrode active material is lithium iron phosphate, and the average particle size of the lithium iron phosphate is 0.5-1.0 um; the negative active material is graphite.
3. The lithium ion battery of claim 1, wherein the conductive agent is selected from one or more of SP, KS-6, CNT; the positive electrode binder is PVDF, and the positive electrode solvent is NMP; the negative electrode binder is CMC and SBR, and the negative electrode solvent is deionized water.
4. The lithium ion battery of claim 1, wherein the diaphragm is a double-sided adhesive coated diaphragm and comprises a base film and an adhesive coated layer, the thickness of the base film is 12-16 um, and the thickness of the adhesive coated layer is 2-4 um.
5. The method for preparing a lithium ion battery according to any one of claims 1 to 4, comprising the steps of:
s1, preparing a positive plate: according to the weight ratio of 93-96 wt% to 2-3 wt%: weighing 2-4 wt% of a positive electrode active material, a conductive agent and a positive electrode binder, and mixing with a positive electrode solvent to obtain positive electrode slurry;
coating the uniformly dispersed anode slurry on an aluminum foil, drying, rolling, slitting and die cutting to obtain the anode plate;
s2, preparing a negative plate: weighing a negative electrode active material, a conductive agent and a negative electrode binder according to the percentage of 94.5-96.5 wt% to 1-2 wt% to 2.5-3.5 wt%, and mixing the negative electrode active material, the conductive agent and the negative electrode binder with a negative electrode solvent to obtain negative electrode slurry;
coating the uniformly dispersed negative electrode slurry on a copper foil, drying, rolling, slitting and die cutting to obtain a negative electrode sheet;
and S3, laminating the S1 positive plate, the S2 negative plate and the double-sided gluing diaphragm in a Z shape, carrying out hot pressing on the laminated battery cell, placing the hot-pressed battery cell in an aluminum plastic film, and carrying out liquid injection, formation and capacity grading to obtain the lithium ion battery.
6. The preparation method of the lithium ion battery according to claim 5, wherein the density of the two sides of the positive plate is 280-320 g/m2The density of the two sides of the negative plate is 140-160 g/m2The compaction density of the positive plate is 2.20-2.40 g/cm3The compacted density of the negative plate is 1.48-1.52 g/cm3。
7. The method for preparing a lithium ion battery according to claim 5, wherein the number of layers of the positive electrode sheets of the zigzag lamination is as follows: 27-29 layers, and 30-32 layers of negative electrode sheets.
8. The method according to claim 5, wherein the parameters of the hot-pressing process are as follows: the temperature is 90-100 ℃, and the pressure is 3-5 kg/cm2And the time is 60-120 s.
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| CN115763947A (en) * | 2022-11-07 | 2023-03-07 | 南开大学 | Ampere-hour-grade sodium ion soft package battery |
| CN116231103A (en) * | 2023-03-03 | 2023-06-06 | 深圳市神通天下科技有限公司 | Laminated lithium ion battery and preparation method thereof |
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| CN116231103A (en) * | 2023-03-03 | 2023-06-06 | 深圳市神通天下科技有限公司 | Laminated lithium ion battery and preparation method thereof |
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Application publication date: 20210528 |