CN114497900B - Lithium ion battery diaphragm with long cycle life and preparation method thereof - Google Patents
Lithium ion battery diaphragm with long cycle life and preparation method thereof Download PDFInfo
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- CN114497900B CN114497900B CN202210139843.4A CN202210139843A CN114497900B CN 114497900 B CN114497900 B CN 114497900B CN 202210139843 A CN202210139843 A CN 202210139843A CN 114497900 B CN114497900 B CN 114497900B
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/28—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
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- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
- Secondary Cells (AREA)
Abstract
The application belongs to the technical field of lithium ion battery diaphragms, and particularly relates to a lithium ion battery diaphragm with a long cycle life and a preparation process thereof. Wherein the high cycle life lithium ion battery separator comprises at least one polyethylene resin layer or at least one polyethylene mixed resin layer containing polypropylene. The lithium ion battery diaphragm can be used in the environment of nonaqueous weak acid electrolyte solution for a long time, has good chemical corrosion resistance and cycle life, and can be fully contacted with the weak acid electrolyte solution, so that the electrolyte solution is fully dispersed in the diaphragm, the transmission rate of lithium ions is improved, and the specific energy density of the battery is improved.
Description
The application relates to a division application, the application number of the original application is 2020101163158, the application date 2020 is 02 and 25, and the application name is a division application of a lithium ion battery diaphragm with high cycle life and a preparation method thereof.
Technical Field
The application belongs to the technical field of lithium ion battery diaphragms, and particularly relates to a lithium ion battery diaphragm with a long cycle life and a preparation process thereof.
Background
A lithium ion battery is generally composed of four parts of a positive electrode material, a negative electrode material, a separator, and an electrolyte, wherein the electrolyte solution dispersed in the separator is mostly a non-aqueous weak acid electrolyte solution, such as PC (propylene carbonate), EC (ethylene carbonate), DMC (dimethyl carbonate), DEC (diethyl carbonate), EMC (methylethyl carbonate), and the like, and thus there is a certain requirement for acid resistance of the separator. The current diaphragms in the market are made of single PE (polyethylene) materials and have certain acid resistance, but the diaphragms need to undergo an electric circulation process in an acid environment for a long time, meanwhile, the internal structure of the diaphragms is ensured to be stable, and the high lithium ion conduction rate is ensured, so that new requirements are put forward for the acid resistance of the diaphragms and the lithium ion conduction rate.
Disclosure of Invention
The application aims to provide a lithium ion battery diaphragm with long cycle life and a preparation process thereof.
In order to solve the technical problems, the application provides a lithium ion battery diaphragm with long cycle life, which comprises the following components: at least one polyethylene resin layer or at least one polyethylene mixed resin layer containing polypropylene.
Further, the polyethylene resin layer comprises the following raw materials: polyethylene blend, acidic additive and porogen.
Further, the acidic additive includes: an organic acidic additive; and the organic acid additive contains one or more of sulfur element, chlorine element and sulfonic acid group; wherein the mass ratio of the sulfur element or the chlorine element to the raw material of the polyethylene resin layer is 10-100ppm.
Further, the polyethylene mixture comprises: low density polyethylene, medium density polyethylene, high density polyethylene, ultra high molecular weight polyethylene; and the polyethylene mixture has a molecular weight distribution index of 10 to 25.
Further, the porogen comprises paraffin oil.
Further, the polyethylene mixed resin layer comprises the following raw materials: a polyolefin blend comprising polypropylene, an acidic additive and a porogen; wherein the polypropylene accounts for 1-10% of the mass of the polyolefin mixture.
Further, the thickness of the lithium ion battery diaphragm is 5-30 mu m, the porosity is 30-50%, the pore size distribution interval is 0.5-5 mu m, and the tensile elongation is not less than 120%.
On the other hand, the application also provides a preparation method of the lithium ion battery diaphragm with long cycle life, which comprises the following steps: thoroughly mixing the polyethylene mixture or polyolefin mixture with an acidic additive; adding a pore-forming agent, and then carrying out melt extrusion to form a sheet; stretching the sheet longitudinally to form a film; stretching the film transversely for one time; immersing in organic solvent for extraction; carrying out secondary transverse stretching on the extracted film; and (5) performing heat setting treatment.
Further, the mixing speed of the full mixing is 200-400r/min, the mixing time is 10-30min, and the mixing temperature is 30-50 ℃.
The high-cycle life lithium ion battery diaphragm comprises at least one polyethylene resin layer or at least one polyethylene mixed resin layer containing polypropylene, can be used in the environment of nonaqueous weak acid electrolyte solution for a long time, has good chemical corrosion resistance and cycle life, and can be fully contacted with the weak acid electrolyte solution, so that the electrolyte solution is fully dispersed in the diaphragm, the transmission rate of lithium ions is improved, and the specific energy density of the battery is improved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a process flow diagram of the preparation of a high cycle life lithium ion battery separator of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Example 1
This embodiment 1 provides a high cycle life lithium ion battery separator comprising: at least one polyethylene resin layer or at least one polyethylene mixed resin layer containing polypropylene.
Optionally, the thickness of the lithium ion battery diaphragm is 5-30 μm, the porosity of the lithium ion battery diaphragm is 30-50%, the pore size distribution interval is 0.5-5 μm, and the tensile elongation is not less than 120%.
As an alternative embodiment of the polyethylene resin layer.
The polyethylene resin layer comprises the following raw materials: polyethylene mixture, acidic additive and pore-forming agent. Wherein the mass ratio of the pore-foaming agent to the polyethylene mixture is 75-100:25.
optionally, the acidic additive includes: an organic acidic additive; and the organic acid additive contains one or more of sulfur element, chlorine element and sulfonic acid group, such as poly (1-butyl-3-vinyl imidazole chloride salt), poly (2-acrylamide-2-methyl-1-propane sulfonate salt) and the like; wherein the mass ratio of the sulfur element or the chlorine element to the raw material of the polyethylene resin layer is 10-100ppm, and can be selected to be 50ppm and 80ppm.
Optionally, the polyethylene mixture comprises: low density polyethylene, medium density polyethylene, high density polyethylene, ultra high molecular weight polyethylene; and the polyethylene mixture has a molecular weight distribution index of 10 to 25.
Alternatively, the porogen may be a solid or liquid paraffinic oil (also known as white oil), or a mixture of paraffinic oils contained in both.
As an alternative to the polyethylene mixed resin layer.
The polyethylene mixed resin layer may include the following raw materials: polyolefin mixture, acidic additive, pore-forming agent; wherein the polypropylene accounts for 1-10% of the mass of the polyolefin mixture.
The polyethylene mixed resin layer is different from the polyethylene resin layer in that the polyolefin mixture in the raw materials not only contains the polyethylene mixture, but also contains polypropylene, and the types of the other components (such as an acid additive, a pore-forming agent and the like) are unchanged, namely the polyolefin mixture comprises: low density polyethylene, medium density polyethylene, high density polyethylene, ultra high molecular weight polyethylene and polypropylene; and the polyethylene mixture has a molecular weight distribution index of 10 to 25.
The lithium ion battery diaphragm with high cycle life in the embodiment 1 has a certain weak acidity by adding the acidic additive into the raw material to form at least one polyethylene resin layer or at least one polyethylene mixed resin layer containing polypropylene, can be used in the environment of a non-aqueous weak acidic electrolyte solution for a long time, and has good chemical corrosion resistance and cycle life; meanwhile, the lithium ion battery has good compatibility with electrode materials and electrolyte solution, and can be fully contacted with the weakly acidic electrolyte solution, so that the electrolyte solution is fully dispersed in the diaphragm, the transmission rate of lithium ions is improved, and the specific energy density of the battery is improved.
Example 2
As shown in fig. 1, on the basis of embodiment 1, embodiment 2 further provides a preparation method of the lithium ion battery separator with a high cycle life, which comprises the following steps: thoroughly mixing the polyethylene mixture or polyolefin mixture with an acidic additive; adding a pore-forming agent, and then carrying out melt extrusion to form a sheet; stretching the sheet longitudinally to form a film; stretching the film transversely for one time; immersing in organic solvent for extraction; carrying out secondary transverse stretching on the extracted film; and (5) performing heat setting treatment.
Optionally, the mixing speed of the full mixing is 200-400r/min, the mixing time is 10-30min, and the mixing temperature is 30-50 ℃. Optionally, the mixing speed of the full mixing is 300r/min, the mixing time is 20min, and the mixing temperature is 45 ℃.
For the component content and the specific implementation procedure of the lithium ion battery separator, refer to the related discussion in example 1, and are not repeated here.
Example 3
(1) Mixing low-density polyethylene, medium-density polyethylene, high-density polyethylene and ultra-high molecular weight polyethylene to form a polyethylene mixture; fully mixing the polyethylene mixture with poly (1-butyl-3-vinyl imidazole chloride), wherein the content of chlorine element accounts for 20ppm of the total mass of the raw materials of the polyethylene resin layer, the mixing speed is 300r/min, the mixing time is 10min, and the mixing temperature is 40 ℃;
(2) The mass ratio of the polyethylene mixture to the polyethylene mixture is 75:25, and then melt extruding the porogen to form a sheet;
(3) Stretching the sheet longitudinally to form a film;
(4) Stretching the film transversely for one time;
(5) Immersing in organic solvent for extraction;
(6) Carrying out secondary transverse stretching on the extracted film;
(7) And performing heat setting treatment to obtain the lithium ion battery diaphragm with the thickness of 12.7 mu m.
Example 4
(1) Mixing low-density polyethylene, medium-density polyethylene, high-density polyethylene and ultra-high molecular weight polyethylene to form a polyethylene mixture; fully mixing the polyethylene mixture with poly (1-butyl-3-vinyl imidazole chloride), wherein the content of chlorine element accounts for 50ppm of the total mass of the raw materials of the polyethylene resin layer, the mixing speed is 300r/min, the mixing time is 10min, and the mixing temperature is 40 ℃;
(2) The mass ratio of the polyethylene mixture to the polyethylene mixture is 75:25, and then melt extruding the porogen to form a sheet;
(3) Stretching the sheet longitudinally to form a film;
(4) Stretching the film transversely for one time;
(5) Immersing in organic solvent for extraction;
(6) Carrying out secondary transverse stretching on the extracted film;
(7) And performing heat setting treatment to obtain the lithium ion battery diaphragm with the thickness of 11.2 mu m.
Example 5
(1) Mixing low-density polyethylene, medium-density polyethylene, high-density polyethylene and ultra-high molecular weight polyethylene to form a polyethylene mixture; fully mixing the polyethylene mixture with poly (1-butyl-3-vinyl imidazole chloride), wherein the content of chlorine element accounts for 70ppm of the total mass of the raw materials of the polyethylene resin layer, the mixing speed is 300r/min, the mixing time is 10min, and the mixing temperature is 40 ℃;
(2) The mass ratio of the polyethylene mixture to the polyethylene mixture is 75:25, and then melt extruding the porogen to form a sheet;
(3) Stretching the sheet longitudinally to form a film;
(4) Stretching the film transversely for one time;
(5) Immersing in organic solvent for extraction;
(6) Carrying out secondary transverse stretching on the extracted film;
(7) And performing heat setting treatment to obtain the lithium ion battery diaphragm with the thickness of 12.5 mu m.
Example 6
(1) Mixing low-density polyethylene, medium-density polyethylene, high-density polyethylene and ultra-high molecular weight polyethylene to form a polyethylene mixture; thoroughly mixing the polyethylene mixture with poly (2-acrylamide-2-methyl-1-propane sulfonate), wherein the content of sulfonic acid groups accounts for 100ppm of the total mass of the raw materials of the polyethylene resin layer, the mixing speed is 200r/min, the mixing time is 30min, and the mixing temperature is 50 ℃;
(2) The mass ratio of the polyethylene mixture to the polyethylene mixture is 85:25, and then melt extruding the porogen to form a sheet;
(3) Stretching the sheet longitudinally to form a film;
(4) Stretching the film transversely for one time;
(5) Immersing in organic solvent for extraction;
(6) Carrying out secondary transverse stretching on the extracted film;
(7) And performing heat setting treatment to obtain the lithium ion battery diaphragm with the thickness of 5 mu m.
Example 7
(1) Mixing low-density polyethylene, medium-density polyethylene, high-density polyethylene and ultra-high molecular weight polyethylene to form a polyethylene mixture; fully mixing the polyethylene mixture with poly (2-acrylamide-2-methyl-1-propane sulfonate), wherein the content of sulfonic acid groups accounts for 10ppm of the total mass of the raw materials of the polyethylene resin layer, the mixing speed is 400r/min, the mixing time is 20min, and the mixing temperature is 30 ℃;
(2) The mass ratio of the polyethylene mixture to the polyethylene mixture is 100:25, and then melt extruding the porogen to form a sheet;
(3) Stretching the sheet longitudinally to form a film;
(4) Stretching the film transversely for one time;
(5) Immersing in organic solvent for extraction;
(6) Carrying out secondary transverse stretching on the extracted film;
(7) And performing heat setting treatment to obtain the lithium ion battery diaphragm with the thickness of 30 mu m.
Example 8
(1) Mixing low-density polyethylene, medium-density polyethylene, high-density polyethylene, ultra-high molecular weight polyethylene and polypropylene to form a polyolefin mixture, wherein the proportion of polypropylene in the total amount of the polyethylene mixture is 1%; fully mixing the polyolefin mixture with poly (1-butyl-3-vinyl imidazole chloride), wherein the chlorine content accounts for 10ppm of the mass ratio of the raw materials of the polyethylene mixed resin layer, the mixing speed is 200r/min, the mixing time is 10min, and the mixing temperature is 30 ℃;
(2) The mass ratio of the mixture of the additive and the polyolefin is 75:25, and then melt extruding the porogen to form a sheet;
(3) Stretching the sheet longitudinally to form a film;
(4) Stretching the film transversely for one time;
(5) Immersing in organic solvent for extraction;
(6) Carrying out secondary transverse stretching on the extracted film;
(7) And performing heat setting treatment to obtain the lithium ion battery diaphragm with the thickness of 20 mu m.
Example 9
(1) Mixing low-density polyethylene, medium-density polyethylene, high-density polyethylene, ultra-high molecular weight polyethylene and polypropylene to form a polyolefin mixture, wherein the proportion of polypropylene in the total amount of the polyethylene mixture is 10%; fully mixing the polyolefin mixture with poly (1-butyl-3-vinyl imidazole chloride), wherein the chlorine content accounts for 100ppm of the mass ratio of the raw materials of the polyethylene mixed resin layer, the mixing speed is 400r/min, the mixing time is 30min, and the mixing temperature is 50 ℃;
(2) The mass ratio of the mixture of the additive and the polyolefin is 100:25, and then melt extruding the porogen to form a sheet;
(3) Stretching the sheet longitudinally to form a film;
(4) Stretching the film transversely for one time;
(5) Immersing in organic solvent for extraction;
(6) Carrying out secondary transverse stretching on the extracted film;
(7) And performing heat setting treatment to obtain the lithium ion battery diaphragm with the thickness of 30 mu m.
Example 10
(1) Mixing low-density polyethylene, medium-density polyethylene, high-density polyethylene, ultra-high molecular weight polyethylene and polypropylene to form a polyolefin mixture, wherein the proportion of polypropylene in the total amount of the polyethylene mixture is 5%; fully mixing the polyolefin mixture with poly (1-butyl-3-vinyl imidazole chloride), wherein the chlorine content accounts for 50ppm of the mass ratio of the raw materials of the polyethylene mixed resin layer, the mixing speed is 250r/min, the mixing time is 15min, and the mixing temperature is 35 ℃;
(2) The mass ratio of the mixture of the additive and the polyolefin is 80:25, and then melt extruding the porogen to form a sheet;
(3) Stretching the sheet longitudinally to form a film;
(4) Stretching the film transversely for one time;
(5) Immersing in organic solvent for extraction;
(6) Carrying out secondary transverse stretching on the extracted film;
(7) And performing heat setting treatment to obtain the lithium ion battery diaphragm with the thickness of 15 mu m.
Comparative example
(1) The mass ratio of the pore-forming agent to the low-density polyethylene is 70:30, mixing and melt extruding to form a sheet;
(2) Stretching the sheet longitudinally to form a film;
(3) Stretching the film transversely for one time;
(4) Immersing in organic solvent for extraction;
(5) Carrying out secondary transverse stretching on the extracted film;
(6) And performing heat setting treatment to obtain the lithium ion battery diaphragm with the thickness of 12.3 mu m.
Example 11
This example 11 was conducted to test the high cycle life lithium ion battery separator prepared in examples 3 to 5, and the lithium ion battery separator in comparative example, respectively, with some parameters and properties shown in table 1. Wherein:
(1) When the diaphragm is subjected to contact angle test, the diaphragm can be measured by adopting a full-automatic contact angle measuring instrument, and the test conditions are as follows: the long sample with the sample size of 1X 3cm is required to be washed with ethanol at 25 ℃ before testing, soaked for 2 hours and dried in vacuum at 50 ℃ for 20 minutes before testing.
(2) Through the charge and discharge test of the small battery, the rapid charge and discharge times of the battery are more than 3000 times, and after the charge and discharge times reach 3000 times, the charge and discharge time of the battery can be increased by 20%.
Table 1 main preparation parameters and performance comparisons of lithium ion battery separator
By combining examples 3-5 and comparative examples, it can be seen that the high cycle life lithium ion battery separator of the present application has a certain weak acidity by adding the acidic additive into the preparation raw material, and can be used in the environment of the non-aqueous weak acidic electrolyte solution for a long period of time, and has good chemical corrosion resistance and cycle life, so that the stable cycle times of the separator are higher than those of the conventional membrane (the lithium ion battery separator prepared in comparative example 1); the chlorine element content is added into the acidic additive, so that the contact angle between the diaphragm and the electrolyte can be obviously reduced, the diaphragm can be fully contacted with the weakly acidic electrolyte, and the electrolyte is fully dispersed in the diaphragm, thereby improving the transmission rate of lithium ions and the specific energy density of the battery; in addition, the lithium ion battery diaphragm with long cycle life is in good contact with the electrode material and the electrolyte solution, so that the weak acid lithium ion battery diaphragm can be ensured to have good compatibility with the electrode material and the electrolyte solution, and the overall performance of the lithium ion battery is improved.
With the above-described preferred embodiments according to the present application as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present application. The technical scope of the present application is not limited to the description, but must be determined according to the scope of claims.
Claims (7)
1. The preparation method of the lithium ion battery diaphragm is characterized by comprising the following steps:
thoroughly mixing the polyethylene mixture or polyolefin mixture with an organic acidic additive prior to melt extrusion;
adding a pore-forming agent, and then carrying out melt extrusion to form a sheet;
stretching the sheet longitudinally to form a film;
stretching the film transversely for one time;
immersing in organic solvent for extraction;
carrying out secondary transverse stretching on the extracted film; and
performing heat setting treatment;
the organic acid additive contains one or more of sulfur element, chlorine element and sulfonic acid group; wherein the method comprises the steps of
The mass ratio of the sulfur element or the chlorine element to the raw material of the polyethylene resin layer is 10-100ppm;
the polyolefin blend comprises a polyethylene blend and polypropylene; wherein the method comprises the steps of
The polypropylene accounts for 1-10% of the mass of the polyolefin mixture.
2. The method of claim 1, wherein,
the polyethylene mixture comprises: low density polyethylene, medium density polyethylene, high density polyethylene, ultra high molecular weight polyethylene; and
the polyethylene mixture has a molecular weight distribution index of 10 to 25.
3. The method of claim 1, wherein,
the pore-forming agent comprises paraffin oil.
4. The method of claim 1, wherein,
the mass ratio of the pore-foaming agent to the polyethylene mixture is 75-100:25.
5. the method of claim 1, wherein,
the thickness of the lithium ion battery diaphragm is 5-30 mu m, the porosity of the lithium ion battery diaphragm is 30-50%, the pore size distribution interval is 0.5-5 mu m, and the tensile elongation is not less than 120%.
6. The method of claim 1, wherein,
the mixing speed of the full mixing is 200-400r/min, the mixing time is 10-30min, and the mixing temperature is 30-50 ℃.
7. A lithium ion battery, comprising:
at least one layer of membrane; the separator is prepared by the preparation method according to any one of claims 1 to 6.
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| CN202210139843.4A CN114497900B (en) | 2020-02-25 | 2020-02-25 | Lithium ion battery diaphragm with long cycle life and preparation method thereof |
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| CN202210139843.4A CN114497900B (en) | 2020-02-25 | 2020-02-25 | Lithium ion battery diaphragm with long cycle life and preparation method thereof |
| CN202010116315.8A CN111180639B (en) | 2020-02-25 | 2020-02-25 | Lithium ion battery diaphragm with long cycle life and preparation method thereof |
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| CN111180639B (en) | 2022-03-11 |
| CN111180639A (en) | 2020-05-19 |
| CN114497900A (en) | 2022-05-13 |
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