CN115000525A - Lithium ion battery cell, preparation method thereof and lithium ion battery - Google Patents
Lithium ion battery cell, preparation method thereof and lithium ion battery Download PDFInfo
- Publication number
- CN115000525A CN115000525A CN202210734744.0A CN202210734744A CN115000525A CN 115000525 A CN115000525 A CN 115000525A CN 202210734744 A CN202210734744 A CN 202210734744A CN 115000525 A CN115000525 A CN 115000525A
- Authority
- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- battery cell
- pole piece
- functional layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 80
- 238000002360 preparation method Methods 0.000 title abstract description 3
- 239000002346 layers by function Substances 0.000 claims abstract description 47
- 239000010410 layer Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 28
- 239000007772 electrode material Substances 0.000 claims abstract description 26
- 239000002243 precursor Substances 0.000 claims abstract description 17
- 238000007731 hot pressing Methods 0.000 claims abstract description 13
- 238000007493 shaping process Methods 0.000 claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims description 33
- 238000000576 coating method Methods 0.000 claims description 33
- 239000002109 single walled nanotube Substances 0.000 claims description 29
- 239000011230 binding agent Substances 0.000 claims description 26
- 239000002245 particle Substances 0.000 claims description 11
- 230000008961 swelling Effects 0.000 claims description 10
- 239000003792 electrolyte Substances 0.000 claims description 9
- 239000013543 active substance Substances 0.000 claims description 8
- 239000004816 latex Substances 0.000 claims description 6
- 229920000126 latex Polymers 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims description 6
- 239000002174 Styrene-butadiene Substances 0.000 claims description 5
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 229940048053 acrylate Drugs 0.000 claims description 3
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 3
- 229920006184 cellulose methylcellulose Polymers 0.000 claims description 3
- 229940091348 latex Drugs 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 235000010413 sodium alginate Nutrition 0.000 claims description 3
- 239000000661 sodium alginate Substances 0.000 claims description 3
- 229940005550 sodium alginate Drugs 0.000 claims description 3
- 239000011115 styrene butadiene Substances 0.000 claims description 3
- 235000010493 xanthan gum Nutrition 0.000 claims description 3
- 239000000230 xanthan gum Substances 0.000 claims description 3
- 229920001285 xanthan gum Polymers 0.000 claims description 3
- 229940082509 xanthan gum Drugs 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims 1
- 239000002002 slurry Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000008367 deionised water Substances 0.000 description 5
- 229910021641 deionized water Inorganic materials 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229920000058 polyacrylate Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- OTYYBJNSLLBAGE-UHFFFAOYSA-N CN1C(CCC1)=O.[N] Chemical compound CN1C(CCC1)=O.[N] OTYYBJNSLLBAGE-UHFFFAOYSA-N 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 238000007756 gravure coating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a lithium ion battery cell, a preparation method thereof and a lithium ion battery. The method for preparing the lithium ion battery cell comprises the following steps: (1) providing a positive pole piece precursor and a negative pole piece precursor, wherein the positive pole piece precursor and the negative pole piece precursor comprise current collectors and electrode active material layers formed on the surfaces of the current collectors; (2) forming a high-viscosity functional layer on at least part of the surface of the electrode active material layer far away from the current collector to respectively obtain a positive pole piece and a negative pole piece; (3) and taking at least one positive pole piece and at least one negative pole piece to be wound or laminated with a diaphragm, and then carrying out hot-pressing shaping to obtain the lithium ion battery cell. According to the method, the high-viscosity functional layer is arranged between the pole piece and the diaphragm, and hot-pressing shaping is combined, so that the problem of an interface between the pole piece and the diaphragm can be effectively solved, and the cycle performance and the rate performance of the battery cell are improved.
Description
Technical Field
The invention relates to the field of electrochemical energy storage equipment, in particular to a method for preparing a lithium ion battery cell, the lithium ion battery cell and a lithium ion battery.
Background
The lithium ion battery generally adopts a polypropylene (PP) or Polyethylene (PE) diaphragm, and a series of interface problems such as wrinkles, purple spots, lithium precipitation and the like are often generated between the diaphragm and the positive and negative electrode plates because of poor adhesion performance.
To solve the above problems, the prior art generally applies a coating layer having a high binder content to the surface of the bare separator. Although the method can improve the interface problem between the positive and negative pole pieces and the diaphragm to a certain extent, the method can influence the porosity of the diaphragm, further influence the transmission of ions and influence the rate performance of the battery. Therefore, the existing method for improving the adhesion between the lithium battery pole piece and the diaphragm still needs to be improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, it is an object of the present invention to propose a method of manufacturing a lithium ion battery cell, a lithium ion battery cell and a lithium ion battery.
In one aspect of the invention, a method of making a lithium ion battery cell is presented. According to an embodiment of the invention, the method comprises: (1) providing a positive pole piece precursor and a negative pole piece precursor, wherein the positive pole piece precursor and the negative pole piece precursor comprise current collectors and electrode active material layers formed on the surfaces of the current collectors; (2) forming a high-viscosity functional layer on at least part of the surface of the electrode active material layer far away from the current collector to respectively obtain a positive pole piece and a negative pole piece; (3) and taking at least one positive pole piece and at least one negative pole piece to be wound or laminated with a diaphragm, and then carrying out hot-pressing shaping to obtain the lithium ion battery cell.
According to the method for preparing the lithium ion battery cell of the embodiment of the invention, firstly, a high-viscosity functional layer is further formed on the surfaces of the electrode active material layers of the positive electrode plate precursor and the negative electrode plate, and the positive electrode plate and the negative electrode plate with the high-viscosity functional layer and the diaphragm are taken to be manufactured into the cell through winding or lamination. The high-viscosity functional layer and the diaphragm have a strong adhesion effect in a hot-pressing shaping mode, and the adhesion of the pole piece and the diaphragm is improved through the high-viscosity functional layer, so that the problem of an interface between the pole piece and the diaphragm is solved; meanwhile, the high-viscosity functional layer has larger swelling capacity, so that the wettability of a diaphragm tightly bonded with the high-viscosity functional layer can be improved, the mobility of lithium ions is improved, and the high-rate charge-discharge performance of the battery is further improved.
In addition, the method for preparing the lithium ion battery cell according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, the high viscosity functional layer comprises single walled carbon nanotubes and a binder.
In some embodiments of the present invention, the aspect ratio of the single-walled carbon nanotube is 1000 to 9000, and the specific surface area of the single-walled carbon nanotube is 200m 2 /g～500m 2 /g。
In some embodiments of the invention, the binder is selected from one or more of PVDF, CMC, styrene-butadiene latex, styrene-acrylic latex, acrylate, xanthan gum, sodium alginate, PTFE.
In some embodiments of the present invention, the particle size of the binder is 0.5 μm to 1.5 μm, and the electrolyte swelling ratio of the binder is 5% to 50%.
In some embodiments of the present invention, the mass ratio of the single-walled carbon nanotubes to the binder is (15-30)%: (70-85)%.
In some embodiments of the present invention, the coating thickness T of the electrode active material layer Active substance layer And a coating thickness T of the highly viscous functional layer Functional layer Satisfies the following conditions: t is more than or equal to 0.005 Functional layer /T Active substance layer ≤0.012。
In another aspect of the present invention, a lithium ion battery cell is provided. According to the embodiment of the invention, the lithium ion battery cell is prepared by the method for preparing the lithium ion battery cell of the embodiment. Therefore, the lithium ion battery cell has good bonding force between the positive and negative electrode plates and the diaphragm, the problem of the interface between the positive and negative electrode plates and the diaphragm can be obviously improved, and the lithium ion battery cell has excellent rate performance.
In yet another aspect of the present invention, a lithium ion battery is presented. According to an embodiment of the present invention, the lithium ion battery includes the lithium ion battery cell of the above embodiment. Therefore, the lithium ion battery has good adhesion between the positive and negative electrode plates and the diaphragm, the problem of the interface between the positive and negative electrode plates and the diaphragm can be obviously improved, and the lithium ion battery has excellent rate performance.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of a pole piece precursor formed with a highly viscous functional layer according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In one aspect of the invention, a method of making a lithium ion battery cell is presented. The method of making a lithium ion battery cell according to an embodiment of the invention is described in further detail below.
First, according to an embodiment of the present invention, a positive electrode sheet precursor and a negative electrode sheet precursor are provided, which include a current collector and an electrode active material layer formed on a surface of the current collector. Specifically, the positive/negative electrode sheet precursor is a positive/negative electrode sheet obtained by coating a positive/negative active material on the surface of a current collector in advance and rolling (cold pressing), and the specific types of the positive/negative current collector and the active material are not particularly limited, and can be selected by those skilled in the art according to actual needs.
Further, according to the embodiment of the invention, a high-viscosity functional layer is formed on at least a part of the surface of the electrode active material layer away from the current collector, so as to respectively obtain the positive pole piece and the negative pole piece. The structure of the positive/negative pole piece is shown in fig. 1, wherein in fig. 1, 1 is a current collector, 2 is a positive or negative active material layer, and 3 is a high-viscosity functional layer. The inventor finds in research that the high-viscosity functional layer can effectively improve the adhesion between the pole piece and the diaphragm in the subsequent hot-pressing shaping process so as to improve the interface problem between the pole piece and the diaphragm; meanwhile, the high-viscosity functional layer has larger swelling capacity, so that the wettability of a diaphragm tightly bonded with the high-viscosity functional layer can be improved, the mobility of lithium ions is improved, and the high-rate charge-discharge performance of the battery is further improved.
According to some embodiments of the present invention, the highly viscous functional layer may be formed by homogenizing the single-walled carbon nanotube and the binder using a solvent and then coating the surface of the electrode active material layer of the electrode sheet. The specific kind of the solvent is not particularly limited, such as deionized water, nitrogen methyl pyrrolidone, and the like. The viscosity of the slurry for forming the highly viscous functional layer is preferably 200 to 1500 mPas. In addition, the high-viscosity functional layer is preferably formed in a gravure coating mode, and compared with transfer coating or extrusion coating, the coating thickness can be reduced, and the influence on the energy density is reduced; compared with a spraying technology, the method has the advantages of small damage to the mature pole piece and low cost.
According to some embodiments of the invention, the high viscosity functional layer comprises single-walled carbon nanotubes and a binder. The single-walled carbon nanotube has good conductivity, can form a good conductive network and is convenient for ion conduction in the battery cell; the adhesive can infiltrate the diaphragm while providing adhesive property, and improve the mobility of lithium ions.
According to some embodiments of the invention, the aspect ratio of the single-walled carbon nanotubes may be 1000 to 9000, such as 1000, 5000, 9000, and the like; the length-diameter ratio of the single-walled carbon nanotube refers to the single-walled carbon nanotubeThe larger the length-to-diameter ratio of the tube (typically in the order of microns), the more slender the tube, the lower its resistivity, and the better the conductive network. The conductivity of the high-viscosity functional layer can be further improved by controlling the length-diameter ratio of the single-walled carbon nanotube within the range. The specific surface area of the single-walled carbon nanotube may be 200m 2 /g～500m 2 G, e.g. 200m 2 /g、400m 2 /g、500m 2 In terms of/g, etc. Therefore, the specific surface area of the single-walled carbon nanotube is small, the side reaction between the single-walled carbon nanotube and the electrolyte can be reduced, and the cycle performance of the battery cell is improved.
According to some embodiments of the invention, the binder is selected from one or more of PVDF, CMC, styrene butadiene latex, styrene acrylic latex, acrylate, xanthan gum, sodium alginate, PTFE.
According to some embodiments of the invention, the particle size of the binder may be 0.5 μm to 1.5 μm, such as 0.5 μm, 1.0 μm, 1.5 μm, and the like. This makes the binder have a large particle size and easily adhere to the separator during hot press forming. The electrolyte swelling ratio of the binder may be 5% to 50%, for example, 5%, 30%, 50%, or the like. Therefore, the binder has a good swelling effect in the electrolyte, can effectively infiltrate the diaphragm, and improves the mobility of lithium ions.
According to some embodiments of the invention, the mass ratio of the single-walled carbon nanotubes to the binder is (15-30)%: (70-85)%.
According to some embodiments of the present invention, the coating thickness T of the electrode active material layer Active substance layer And coating thickness T of highly viscous functional layer Functional layer Satisfies the following conditions: t is more than or equal to 0.005 Functional layer /T Active substance layer Less than or equal to 0.012. Specifically, the coating thickness T of the electrode active material layer Active substance layer And coating thickness T of highly viscous functional layer Functional layer The ratio of (b) may be 0.005, 0.008, 0.01, 0.012, etc. By controlling the coating thickness T of the electrode active material layer Active substance layer And coating thickness T of highly viscous functional layer Functional layer The ratio of (A) is within the range, so that the high adhesion effect can be achieved while the influence on the energy density is reduced, and the cell boundary is improvedThe problem is solved. If the ratio is too low, the coating may be uneven and the bonding effect may not be good; if the ratio is too high, the overall cell energy efficiency may be affected, and the cell cost per watt-hour may be increased.
Further, according to the embodiment of the invention, at least one positive electrode plate and at least one negative electrode plate are taken to be wound or laminated with the diaphragm, and then hot-pressing shaping is carried out to obtain the lithium ion battery cell.
According to some embodiments of the present invention, the temperature used for hot press shaping may be 55 ℃ to 105 ℃ and the pressure may be 8000 kgf to 11000 kgf.
In another aspect of the present invention, a lithium ion battery cell is provided. According to an embodiment of the present invention, the lithium ion battery cell is prepared by the method for preparing the lithium ion battery cell of the above embodiment. Therefore, the lithium ion battery cell has good bonding force between the positive and negative electrode plates and the diaphragm, the problem of the interface between the positive and negative electrode plates and the diaphragm can be obviously improved, and the lithium ion battery cell has excellent rate performance.
In addition, it should be noted that all the features and advantages described above for the method for preparing the lithium ion battery cell are also applicable to the lithium ion battery cell product, and are not described in detail herein.
In yet another aspect of the present invention, a lithium ion battery is presented. According to an embodiment of the present invention, the lithium ion battery includes the lithium ion battery cell of the above embodiment. Therefore, the lithium ion battery has good adhesion between the positive and negative electrode plates and the diaphragm, the problem of the interface between the positive and negative electrode plates and the diaphragm can be obviously improved, and the lithium ion battery has excellent rate performance.
In addition, it should be noted that all the features and advantages described above for the method for preparing the lithium ion battery cell and the lithium ion battery cell are also applicable to the lithium ion battery, and are not described in detail herein.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Example 1
The lithium ion battery cell is prepared according to the following method:
(1) the single-walled carbon nanotube and a mixed binder (polyacrylate + styrene-acrylic) are mixed according to the mass ratio of 20%: mixing 80 percent of the components, and homogenizing by using deionized water to obtain high-viscosity functional slurry with the viscosity of 1200mPa & s; wherein, the length-diameter ratio of the single-walled carbon nanotube is 8000, and the specific surface area is 400m 2 (ii)/g; the binder had a particle diameter of 1 μm and a swelling ratio in the electrolyte of 50%.
(2) Coating high-viscosity functional slurry on the surfaces, far away from the current collector, of the electrode active material layers on the positive current collector and the negative current collector in a gravure manner, controlling the ratio of the coating thickness of the electrode active material layers to the coating thickness of the high-viscosity functional layers to be 0.01, forming the high-viscosity functional layers, and obtaining a positive pole piece and a negative pole piece;
(3) and taking a plurality of positive pole pieces, negative pole pieces and diaphragms for winding, and then carrying out hot-pressing shaping to obtain the lithium ion battery core.
Example 2
The lithium ion battery cell is prepared according to the following method:
(1) the mass ratio of the single-wall carbon nanotube to PVDF is 30%: mixing 70%, and homogenizing by using N-methyl pyrrolidone to obtain high-viscosity functional slurry with the viscosity of 800mPa & s; wherein, the length-diameter ratio of the single-wall carbon nano tube is 8000, and the specific surface area is 400m 2 (ii)/g; the binder had a particle diameter of 0.5 μm and a swelling ratio in the electrolyte of 15%.
(2) Coating high-viscosity functional slurry on the surfaces, far away from the current collector, of the electrode active material layers on the positive current collector and the negative current collector in a gravure manner, controlling the ratio of the coating thickness of the electrode active material layers to the coating thickness of the high-viscosity functional layers to be 0.01, forming the high-viscosity functional layers, and obtaining a positive pole piece and a negative pole piece;
(3) and (3) taking a plurality of positive pole pieces, negative pole pieces and diaphragms for lamination, and then carrying out hot-pressing shaping to obtain the lithium ion battery core.
Example 3
The lithium ion battery cell is prepared according to the following method:
(1) the single-walled carbon nanotube and a mixed binder (CMC + SBR) are mixed according to the mass ratio of 15%: 85 percent of the components are mixed, and deionized water is used for homogenate to obtain high-viscosity functional slurry with the viscosity of 500mPa & s; wherein, the length-diameter ratio of the single-walled carbon nanotube is 5000, and the specific surface area is 400m 2 (ii)/g; the SBR had a particle size of 0.5 μm and a swelling ratio in the electrolyte of 30%.
(2) Coating high-viscosity functional slurry on the surfaces, far away from the current collector, of the electrode active material layers on the positive current collector and the negative current collector in a gravure manner, and controlling the ratio of the coating thickness of the electrode active material layers to the coating thickness of the high-viscosity functional layer to be 0.008 to form the high-viscosity functional layer, so as to obtain a positive pole piece and a negative pole piece;
(3) and taking a plurality of positive pole pieces, negative pole pieces and diaphragms for winding, and then carrying out hot-pressing shaping to obtain the lithium ion battery core.
Example 4
The lithium ion battery cell is prepared according to the following method:
(1) the single-walled carbon nanotube and a mixed binder (CMC + styrene-acrylic) are mixed according to the mass ratio of 15%: 85 percent of the components are mixed, and deionized water is used for homogenate to obtain high-viscosity functional slurry with the viscosity of 1000mPa & s; wherein, the length-diameter ratio of the single-wall carbon nano tube is 4000, the specific surface area is 300m 2 (ii)/g; the particle size of the styrene-acrylic is 0.8 mu m; the swelling ratio in the electrolytic solution was 45%.
(2) Coating high-viscosity functional slurry on the surfaces, far away from the current collector, of the electrode active material layers on the positive current collector and the negative current collector in a gravure manner, and controlling the ratio of the coating thickness of the electrode active material layers to the coating thickness of the high-viscosity functional layer to be 0.008 to form the high-viscosity functional layer, so as to obtain a positive pole piece and a negative pole piece;
(3) and (3) taking a plurality of positive pole pieces, negative pole pieces and diaphragms for lamination, and then carrying out hot-pressing shaping to obtain the lithium ion battery core.
Example 5
The lithium ion battery cell is prepared according to the following method:
(1) the mass ratio of the single-walled carbon nanotube to polyacrylate is 20%: 80% mixing, homogenizing with deionized water to obtain a slurry with a viscosity of 600mHigh-viscosity functional slurry of Pa.s; wherein, the length-diameter ratio of the single-wall carbon nano tube is 4000, the specific surface area is 300m 2 (ii)/g; the polyacrylate particle size was 0.8 μm, and the swelling ratio in the electrolyte was 45%.
(2) Coating high-viscosity functional slurry on the surfaces, far away from the current collector, of the electrode active material layers on the positive current collector and the negative current collector in a gravure manner, and controlling the ratio of the coating thickness of the electrode active material layers to the coating thickness of the high-viscosity functional layer to be 0.008 to form the high-viscosity functional layer, so as to obtain a positive pole piece and a negative pole piece;
(3) and taking a plurality of positive pole pieces, negative pole pieces and diaphragms for winding, and then carrying out hot-pressing shaping to obtain the lithium ion battery core.
Comparative example 1
A lithium ion battery cell was produced in the same manner as in example 1 except that a pure PP film was used as the separator.
Comparative example 2
A lithium ion battery cell was prepared in substantially the same manner as in example 1, except that the separator was a pure PE + CCS coating film.
Comparative example 3
A lithium ion battery cell was fabricated in the substantially same manner as in example 1, except that single-walled carbon nanotubes having an aspect ratio of 800 and a specific surface area of 150m were used 2 /g。
Comparative example 4
A lithium ion battery cell was produced in the same manner as in example 1 except that the binder used had a particle size of 0.2 μm.
Comparative example 5
A lithium ion battery cell was fabricated in substantially the same manner as in example 1, except that the binder used had a particle size of 2 μm.
Comparative example 6
A lithium ion battery cell was fabricated in substantially the same manner as in example 1, except that the ratio of the coating thickness of the electrode active material layer to the coating thickness of the highly viscous functional layer was controlled to 0.002.
Test example 1
Respectively taking the electric cores prepared in the examples 1-5 and the comparative examples 1-7, testing the bonding force between the positive and negative electrode plates and the diaphragm after hot pressing, and defining the bonding force A between the diaphragm and the positive electrode plate and the bonding force B between the diaphragm and the negative electrode plate; the cell was analyzed and the cell interface conditions were noted, with the results as given in the table below.
Test example 2
The cells prepared in examples 1 to 5 and comparative examples 1 to 7 were respectively injected with liquid to prepare test cells, the cell types were controlled to be single variables, and the rate performance and cycle performance of the test cells were measured, and the results are shown in the following table.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method of making a lithium ion battery cell, comprising:
(1) providing a positive pole piece precursor and a negative pole piece precursor, wherein the positive pole piece precursor and the negative pole piece precursor comprise current collectors and electrode active material layers formed on the surfaces of the current collectors;
(2) forming a high-viscosity functional layer on at least part of the surface of the electrode active material layer far away from the current collector to respectively obtain a positive pole piece and a negative pole piece;
(3) and winding or laminating at least one positive pole piece and at least one negative pole piece with a diaphragm, and then performing hot-pressing shaping to obtain the lithium ion battery core.
2. The method of making a lithium ion battery cell of claim 1, wherein the high viscosity functional layer comprises single walled carbon nanotubes and a binder.
3. The method for preparing the battery cell of the lithium ion battery as claimed in claim 2, wherein the aspect ratio of the single-walled carbon nanotube is 1000 to 9000.
4. The method of preparing a lithium ion battery cell of claim 2, wherein the single-walled carbon nanotube has a specific surface area of 200m 2 /g～500m 2 /g。
5. The method of preparing a lithium ion battery cell of claim 2, wherein the binder is selected from one or more of PVDF, CMC, styrene-butadiene latex, styrene-acrylic latex, acrylate, xanthan gum, sodium alginate, PTFE.
6. The method of preparing a lithium ion battery cell according to claim 2, wherein the particle size of the binder is 0.5 μm to 1.5 μm, and the electrolyte swelling ratio of the binder is 5% to 50%.
7. The method for preparing a lithium ion battery cell according to claim 2, wherein the mass ratio of the single-walled carbon nanotube to the binder is (15-30)%: (70-85)%.
8. The method for preparing a lithium ion battery cell according to any one of claims 1 to 7, wherein the coating thickness T of the electrode active material layer Active substance layer And a coating thickness T of the highly viscous functional layer Functional layer Satisfies the following conditions: t is more than or equal to 0.005 Functional layer /T Active substance layer ≤0.012。
9. A lithium ion battery cell, characterized in that, it is prepared by the method for preparing a lithium ion battery cell of any claim 1 to 8.
10. A lithium ion battery comprising the lithium ion battery cell of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210734744.0A CN115000525B (en) | 2022-06-27 | 2022-06-27 | Lithium ion battery cell, preparation method thereof and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210734744.0A CN115000525B (en) | 2022-06-27 | 2022-06-27 | Lithium ion battery cell, preparation method thereof and lithium ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115000525A true CN115000525A (en) | 2022-09-02 |
| CN115000525B CN115000525B (en) | 2024-07-23 |
Family
ID=83037895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210734744.0A Active CN115000525B (en) | 2022-06-27 | 2022-06-27 | Lithium ion battery cell, preparation method thereof and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115000525B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010033803A (en) * | 2008-07-28 | 2010-02-12 | Hitachi Vehicle Energy Ltd | Nonaqueous electrolyte secondary battery |
| CN105322177A (en) * | 2015-11-16 | 2016-02-10 | 深圳市沃特玛电池有限公司 | Lithium ion battery pole piece and preparation method therefor, and lithium ion battery |
| CN106505187A (en) * | 2016-12-07 | 2017-03-15 | 辉能（天津）科技发展有限公司 | Slurry and the pole piece comprising the slurry, the preparation method of lithium ion battery cell |
| CN107230774A (en) * | 2016-03-23 | 2017-10-03 | 宁德新能源科技有限公司 | Cathode pole piece and lithium ion battery |
| CN108390101A (en) * | 2018-01-03 | 2018-08-10 | 多氟多（焦作）新能源科技有限公司 | A kind of lithium ion battery cell and preparation method thereof, lithium ion battery |
| CN112510248A (en) * | 2020-12-25 | 2021-03-16 | 王书珍 | High-energy-density lithium ion battery and preparation method thereof |
| CN112542572A (en) * | 2019-09-23 | 2021-03-23 | 珠海冠宇电池股份有限公司 | Novel lithium ion battery positive pole piece and preparation method and application thereof |
| CN113675401A (en) * | 2021-07-13 | 2021-11-19 | 天能电池集团股份有限公司 | Laminated lithium ion battery and negative pole piece thereof |
-
2022
- 2022-06-27 CN CN202210734744.0A patent/CN115000525B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010033803A (en) * | 2008-07-28 | 2010-02-12 | Hitachi Vehicle Energy Ltd | Nonaqueous electrolyte secondary battery |
| CN105322177A (en) * | 2015-11-16 | 2016-02-10 | 深圳市沃特玛电池有限公司 | Lithium ion battery pole piece and preparation method therefor, and lithium ion battery |
| CN107230774A (en) * | 2016-03-23 | 2017-10-03 | 宁德新能源科技有限公司 | Cathode pole piece and lithium ion battery |
| CN106505187A (en) * | 2016-12-07 | 2017-03-15 | 辉能（天津）科技发展有限公司 | Slurry and the pole piece comprising the slurry, the preparation method of lithium ion battery cell |
| CN108390101A (en) * | 2018-01-03 | 2018-08-10 | 多氟多（焦作）新能源科技有限公司 | A kind of lithium ion battery cell and preparation method thereof, lithium ion battery |
| CN112542572A (en) * | 2019-09-23 | 2021-03-23 | 珠海冠宇电池股份有限公司 | Novel lithium ion battery positive pole piece and preparation method and application thereof |
| CN112510248A (en) * | 2020-12-25 | 2021-03-16 | 王书珍 | High-energy-density lithium ion battery and preparation method thereof |
| CN113675401A (en) * | 2021-07-13 | 2021-11-19 | 天能电池集团股份有限公司 | Laminated lithium ion battery and negative pole piece thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115000525B (en) | 2024-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111969214B (en) | Positive plate with special-shaped structure and lithium ion battery comprising positive plate | |
| US8821593B2 (en) | Method for manufacturing electrode for electrochemical element | |
| CN107978732B (en) | Pole piece and battery | |
| CN114927639A (en) | Negative pole piece, preparation method thereof and secondary battery | |
| CN112825354B (en) | Lithium negative electrode, preparation method thereof and lithium secondary battery | |
| CN111916666A (en) | Negative plate with special-shaped structure and lithium ion battery comprising same | |
| CN114709566B (en) | Ultrathin coated diaphragm and preparation method thereof | |
| CN114221045A (en) | Preparation method of porous carbon lithium-supplement negative electrode sheet lithium ion battery | |
| CN112467308A (en) | Diaphragm, preparation method thereof and lithium ion battery | |
| CN114068857A (en) | Preparation method and application of electrode slice | |
| CN104882614A (en) | Lead-acid battery plate with high energy density | |
| CN112542565A (en) | Negative plate for improving quick charge capacity of lithium ion battery and preparation method and application thereof | |
| CN218274694U (en) | Dry method composite electrode pole piece and lithium battery | |
| CN111786040A (en) | Pole piece, application thereof and low-temperature-rise long-life lithium ion battery containing pole piece | |
| CN116417658A (en) | Secondary battery and application thereof | |
| JP2013145761A (en) | Method for manufacturing electrode for electrochemical element | |
| CN111430721A (en) | Composite electrode and preparation method and application thereof | |
| JP5293539B2 (en) | Electrode active material sheet with support and method for producing electrode for electrochemical device | |
| CN210379259U (en) | Positive plate for improving rate capability of lithium ion battery | |
| CN117497835A (en) | Solid-state battery cell, preparation method thereof and solid-state battery | |
| CN115084526B (en) | Positive electrode sheet and battery | |
| CN217134409U (en) | Battery pole piece and secondary battery | |
| CN115000525B (en) | Lithium ion battery cell, preparation method thereof and lithium ion battery | |
| JP2010086788A (en) | Method of manufacturing electrode for electrochemical element | |
| CN113193203A (en) | Silicon-carbon negative plate, preparation method thereof and lithium ion battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 361006 room 201-1, complex building 5, No. 11, Butang Middle Road, industrial base, Xiamen Torch High tech Zone (Tongxiang), Xiamen, Fujian Applicant after: Xiamen Haichen Energy Storage Technology Co.,Ltd. Address before: 361006 room 201-1, complex building 5, No. 11, Butang Middle Road, industrial base, Xiamen Torch High tech Zone (Tongxiang), Xiamen, Fujian Applicant before: Xiamen Haichen New Energy Technology Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |