CN114976472A - Aerogel battery diaphragm and preparation method thereof - Google Patents
Aerogel battery diaphragm and preparation method thereof Download PDFInfo
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- CN114976472A CN114976472A CN202210532816.3A CN202210532816A CN114976472A CN 114976472 A CN114976472 A CN 114976472A CN 202210532816 A CN202210532816 A CN 202210532816A CN 114976472 A CN114976472 A CN 114976472A
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- aerogel
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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
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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
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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
- H01M50/457—Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
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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 & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
Abstract
The invention discloses an aerogel battery diaphragm which comprises a base layer, wherein the base layer is made of non-woven fabric, at least one surface of the base layer is coated with an aerogel layer, and the aerogel layer is composed of the following raw materials in parts by weight: 10-20 parts of aerogel particles, 0.3-1 part of an active agent, 2-5 parts of a binder and 40-50 parts of deionized water, wherein the thickness of the aerogel battery diaphragm can reach 16 micrometers or even thinner, the porosity can reach more than 60%, the pore diameter is 0.01-0.1 mu m, and the surface density is 5g/m 2. The invention also discloses a preparation method of the aerogel battery diaphragm. The aerogel battery membrane disclosed by the invention is good in air permeability, high in liquid absorption rate, low in shrinkage rate and high in strength. The application of the aerogel battery diaphragm can effectively improve the capacity, the circulation and the safety performance of the battery.
Description
Technical Field
The invention relates to the technical field of battery diaphragms, in particular to an aerogel battery diaphragm and a preparation method thereof.
Background
The battery is widely applied to the fields of electronic communication, energy storage, power supply and the like, the battery diaphragm is a very critical part in the battery, and the most important function of the battery diaphragm is to separate the positive plate and the negative plate in the battery and prevent the positive plate and the negative plate from being in direct contact with each other to generate short circuit. Meanwhile, because the diaphragm is provided with a large number of tortuous and through micropores, positive ions and negative ions in the battery can freely pass through the micropores and migrate between the positive plate and the negative plate to form a conductive loop in the battery. With the discovery of current battery technology, the demand for separators has also become higher and higher. Therefore, the separator needs to have a high liquid absorption rate, stable chemical properties, and excellent mechanical properties and ability to maintain a shape at high temperatures.
At present, the battery diaphragm for large-scale commercialization is mainly a polyolefin membrane, and the diaphragm can isolate the positive electrode and the negative electrode of the battery so as to prevent short circuit. However, they have disadvantages in terms of insulation, mechanical strength, heat resistance, etc. when used in power batteries.
Therefore, development of a separator having more excellent performance has been a major direction of development of separators.
Disclosure of Invention
The invention provides an aerogel battery diaphragm and a preparation method thereof, aiming at the defects in the prior art.
In order to solve the technical problem, the invention is solved by the following technical scheme:
the utility model provides an aerogel battery diaphragm, includes the basic unit, the basic unit is the non-woven fabrics, at least one side coating has aerogel layer on the basic unit, aerogel layer comprises the raw materials of following parts by weight: 10-20 parts of aerogel particles, 0.3-1 part of an active agent, 2-5 parts of a binder and 40-50 parts of deionized water, wherein the thickness of the aerogel battery diaphragm can reach 16 micrometers or even thinner, the porosity can reach more than 60%, the pore diameter is 0.01-0.1 mu m, and the surface density is lower than 5g/m 2.
Preferably, the aerogel layer has a thickness of 3 to 10 μm.
Preferably, the aerogel layer may also be one or more of a sol gel or a nanocomposite.
Preferably, the particle size of the aerogel particles is 1-10 microns, the coating thickness of the aerogel layer is 3-10 microns, and the content of the aerogel particles in the aerogel battery diaphragm is more than 45%.
In order to solve the technical problem, the invention is solved by the following technical scheme:
an aerogel battery diaphragm and a preparation method thereof comprise the following steps:
s1, preparing an aerogel layer:
weighing 10-20 parts by weight of aerogel particles, 0.3-1 part by weight of an active agent, 2-5 parts by weight of a binder and 40-50 parts by weight of deionized water, sequentially adding the aerogel particles with the particle size of 1-10 microns, the active agent and the binder into the deionized water, and fully and uniformly stirring to obtain coating slurry;
s2, base layer coating:
cleaning a non-woven fabric base layer with the thickness of 12-15 mu m for at least 2 times by using absolute ethyl alcohol, drying at natural temperature, spreading, then carrying out plasma treatment, coating the aerogel coating slurry after S1 on at least one surface of the base layer, wherein the coating thickness is 3-10 mu m, and forming an aerogel battery diaphragm semi-finished product;
s3, base layer post-processing:
and drying, shaping and rolling the semi-finished product of the aerogel battery diaphragm after the step S2 to obtain the aerogel battery diaphragm.
Has the advantages that: the invention selects aerogel as functional high temperature resistant base material, the aerogel is a light nano porous amorphous solid material with excellent performance, the void ratio is as high as 80-99.8%, the typical size of the holes is 1-100 nm, the specific surface area is 400-1000 square meters/g, the density can be as low as 3 kg/cubic meter (only 3 times of air), the room temperature thermal conductivity can be as low as 0.012W/(m. Calvin), and the hardness is very firm. The battery diaphragm has the advantages of good air permeability, high liquid absorption rate, pore diameter of 0.01-0.1 mu m, low shrinkage rate, high strength and the like, and has a porous structure, high liquid absorption rate, strong mechanical strength, thin thickness, stable electrochemical performance and the like. The application of the aerogel on the battery diaphragm can effectively improve the capacity, the cycle and the safety performance of the battery.
Description of the drawings:
fig. 1 is a schematic diagram of a first embodiment of the present invention.
FIG. 2 is a schematic diagram of a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, which are illustrative of the present invention and are not to be construed as being limited thereto.
In order to solve the technical problem, the invention is solved by the following technical scheme:
the utility model provides an aerogel battery diaphragm, includes the basic unit, the basic unit is the non-woven fabrics, at least one side coating has aerogel layer in the basic unit, aerogel layer comprises the raw materials of following parts by weight: 10-20 parts of aerogel particles, 0.3-1 part of an active agent, 2-5 parts of a binder and 40-50 parts of deionized water, wherein the thickness of the aerogel battery diaphragm can reach 16 micrometers or even thinner, the porosity can reach more than 60%, the pore diameter is 0.01-0.1 mu m, and the surface density is lower than 5g/m 2.
Preferably, the aerogel layer has a thickness of 3 to 10 μm.
Preferably, the aerogel layer may also be one or more of a sol gel or a nanocomposite.
Preferably, the particle size of the aerogel particles is 1-10 microns, the coating thickness of the aerogel layer is 3-10 microns, and the content of the aerogel particles in the aerogel battery diaphragm is more than 45%.
The invention provides an aerogel battery diaphragm which comprises a base layer made of non-woven fabric, and aerogel particles coated on the base layer.
According to the invention, the aerogel particles are coated on the base layer of the aerogel diaphragm, and the nano holes of the aerogel particles are reserved on the diaphragm, and as the porosity and the specific surface area of the aerogel are extremely large, the nano holes can absorb electrolyte by utilizing the capillary force of the aerogel, so that the aerogel diaphragm is fully wetted, and the energy density of the battery is improved; the aerogel has good insulating property and strength, so that the anti-piercing capability of the aerogel is strong, and the effective insulation of the aerogel diaphragm is ensured. The safety performance, the cycle performance and the rate performance of the battery are ensured by the performance of the aerogel battery diaphragm, and meanwhile, the energy density of the battery is improved.
Preferably, the coating thickness of the aerogel particles is 3-10 μm, but as long as the aerogel particle coating can ensure that the thickness of the diaphragm meets the requirement of the aerogel battery diaphragm, other values in the numerical range are also applicable, and the preferred thickness is 3-10 μm.
Preferably, the particle size of the aerogel particles is 1-10 μm. However, as long as the particle size of the aerogel particles meets the use requirement after the aerogel battery diaphragm is coated on the base layer, the thickness of the aerogel battery diaphragm meets the use requirement, and the numerical values which are not listed in the numerical value range are also applicable, and the preferred particle size is 1-10 μm.
Preferably, the thickness of the aerogel diaphragm is 15-25 μm. When the thickness of the aerogel battery diaphragm can meet the requirement, other values in the numerical range are also applicable, and the preferable thickness is 15-25 μm.
Preferably, the content of the aerogel particles in the membrane base layer is 45% or more. However, other values within the numerical range not recited are equally applicable in the case where the gas permeability and porosity of the aerogel battery separator can be satisfied, and the content is preferably 45% or more.
In order to solve the technical problem, the invention is solved by the following technical scheme:
an aerogel battery diaphragm and a preparation method thereof comprise the following steps:
s1, preparing an aerogel layer:
weighing 10-20 parts by weight of aerogel particles, 0.3-1 part by weight of an active agent, 2-5 parts by weight of a binder and 40-50 parts by weight of deionized water, sequentially adding the aerogel particles with the particle size of 1-10 microns, the active agent and the binder into the deionized water, and fully and uniformly stirring to obtain coating slurry;
s2, base layer coating:
cleaning a non-woven fabric base layer with the thickness of 12-15 mu m for at least 2 times by using absolute ethyl alcohol, drying at natural temperature, spreading, then carrying out plasma treatment, coating the aerogel coating slurry after S1 on at least one surface of the base layer, wherein the coating thickness is 3-10 mu m, and forming an aerogel battery diaphragm semi-finished product;
s3, base layer post-processing:
and drying, shaping and rolling the semi-finished product of the aerogel battery diaphragm after the step S2 to obtain the aerogel battery diaphragm.
The first embodiment is as follows:
an aerogel battery diaphragm and a preparation method thereof comprise the following steps:
s1, preparing an aerogel layer:
weighing 10 parts by weight of aerogel particles, 0.3 part by weight of an active agent, 2 parts by weight of a binder and 40 parts by weight of deionized water, sequentially adding the aerogel particles with the particle size of 1 mu m, the active agent and the binder into the deionized water, and fully and uniformly stirring to obtain coating slurry;
s2, base layer coating:
cleaning a non-woven fabric base layer with the thickness of 12 microns for 2 times by using absolute ethyl alcohol, drying at natural temperature, flattening, then carrying out plasma treatment, coating the aerogel coating slurry subjected to S1 on one surface of the base layer, wherein the coating thickness is 3 microns, and forming an aerogel battery diaphragm semi-finished product;
s3, base layer post-processing:
and (3) drying, shaping and rolling the semi-finished product of the aerogel battery diaphragm after the step (S2) to obtain the aerogel battery diaphragm (detailed figure 1).
Example two:
an aerogel battery diaphragm and a preparation method thereof comprise the following steps:
s1, preparing an aerogel layer:
weighing 20 parts by weight of aerogel particles, 1 part by weight of an active agent, 5 parts by weight of a binder and 50 parts by weight of deionized water, sequentially adding the aerogel particles with the particle size of 10 microns, the active agent and the binder into the deionized water, and fully and uniformly stirring to obtain coating slurry;
s2, single-sided base coating:
cleaning a non-woven fabric base layer with the thickness of 12-15 mu m for 2 times by using absolute ethyl alcohol, drying at natural temperature, flattening, then carrying out plasma treatment, coating the aerogel coating slurry after S1 on one surface of the base layer, wherein the coating thickness is 5 mu m, and forming a semi-finished product of the battery diaphragm with the single-surface coated aerogel slurry;
s3, single-sided base layer post-treatment:
drying the semi-finished product of the battery diaphragm with the single side coated with the aerogel slurry after S2;
s4, coating the other surface of the substrate:
coating aerogel slurry on the base layer on the other side after the step S3, wherein the coating thickness is 5 mu m, and forming a semi-finished product of the battery diaphragm with the aerogel slurry coated on the two sides;
s5, post-processing:
and (3) drying, shaping and rolling the semi-finished product of the battery diaphragm coated with the aerogel slurry on the two sides after the step (S4) to obtain the aerogel battery diaphragm (detailed figure 2).
Example three:
an aerogel battery diaphragm and a preparation method thereof comprise the following steps:
s1, preparing an aerogel layer:
weighing 15 parts by weight of aerogel particles, 0.8 part by weight of an active agent, 4 parts by weight of a binder and 45 parts by weight of deionized water, sequentially adding the aerogel particles with the particle size of 8 mu m, the active agent and the binder into the deionized water, and fully and uniformly stirring to obtain coating slurry;
s2, base layer coating:
cleaning a non-woven fabric base layer with the thickness of 12-15 mu m for 3 times by using absolute ethyl alcohol, drying at natural temperature, spreading and then carrying out plasma treatment, and then coating the aerogel coating slurry after S1 on one surface of the base layer with the coating thickness of 8 mu m to form a semi-finished aerogel battery diaphragm product;
s3, base layer post-processing:
and drying, shaping and rolling the semi-finished product of the aerogel battery diaphragm after the step S2 to obtain the aerogel battery diaphragm.
In addition, it should be noted that the specific embodiments described in the present specification may differ in the shape of the components, the names of the components, and the like. All equivalent or simple changes of the structure, the characteristics and the principle of the invention which are described in the patent conception of the invention are included in the protection scope of the patent of the invention. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (7)
1. The utility model provides an aerogel battery diaphragm, includes the basic unit, its characterized in that, the basic unit is the non-woven fabrics, at least one side coating has aerogel layer in the basic unit, aerogel layer comprises the raw materials of following parts by weight: 10-20 parts of aerogel particles, 0.3-1 part of an active agent, 2-5 parts of a binder and 40-50 parts of deionized water, wherein the thickness of the aerogel battery diaphragm can reach 16 micrometers or even thinner, the porosity can reach more than 60%, the pore diameter is 0.01-0.1 mu m, and the surface density is lower than 5g/m 2.
2. The aerogel battery separator as in claim 1, wherein the non-woven fabric of the separator base layer has a thickness of 12-15 μm or less.
3. The aerogel battery separator according to claim 1, wherein the aerogel particles have a particle size of 1-10 μm.
4. An aerogel battery separator as in claim 1, wherein the aerogel coating has a thickness of 3-10 μm.
5. The aerogel battery separator of claim 1, wherein the aerogel coating can also be comprised of one or more of sol-gel or nanocomposite.
6. The aerogel battery separator according to claim 1, wherein the content of the aerogel particles in the aerogel battery separator is 45% or more.
7. The preparation method of the aerogel battery diaphragm is characterized by comprising the following steps:
s1, preparing an aerogel layer:
weighing 10-20 parts by weight of aerogel particles, 0.3-1 part by weight of an active agent, 2-5 parts by weight of a binder and 40-50 parts by weight of deionized water, sequentially adding the aerogel particles with the particle size of 1-10 microns, the active agent and the binder into the deionized water, and fully and uniformly stirring to obtain coating slurry;
s2, base layer coating:
cleaning a non-woven fabric base layer with the thickness of 12-15 mu m for at least 2 times by using absolute ethyl alcohol, drying at natural temperature, spreading, then carrying out plasma treatment, coating the aerogel coating slurry after S1 on at least one surface of the base layer, wherein the coating thickness is 3-10 mu m, and forming an aerogel battery diaphragm semi-finished product;
s3, base layer post-processing:
and drying, shaping and rolling the semi-finished product of the aerogel battery diaphragm after the step S2 to obtain the aerogel battery diaphragm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210532816.3A CN114976472A (en) | 2022-05-17 | 2022-05-17 | Aerogel battery diaphragm and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210532816.3A CN114976472A (en) | 2022-05-17 | 2022-05-17 | Aerogel battery diaphragm and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024089218A1 (en) * | 2022-10-27 | 2024-05-02 | Keey Aerogel | Insulating separator for an electric battery |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106450116A (en) * | 2016-09-27 | 2017-02-22 | 郑州大学 | Novel hydrophobic silica aerogel composite separator for lithium ion battery |
| CN106784558A (en) * | 2017-03-13 | 2017-05-31 | 厦门大学 | Ceramic diaphragm with aeroge as powder and its application in lithium ion battery |
| CN109449355A (en) * | 2018-10-29 | 2019-03-08 | 郑州大学 | A kind of battery modified polyacrylonitrile non-woven fabrics/aerosil composite diaphragm and preparation method thereof |
| CN112062989A (en) * | 2020-08-10 | 2020-12-11 | 航天特种材料及工艺技术研究所 | Polyimide aerogel lithium battery diaphragm and preparation method thereof |
| WO2022067511A1 (en) * | 2020-09-29 | 2022-04-07 | 宁德新能源科技有限公司 | Electrode assembly and manufacturing method therefor, and lithium battery |
-
2022
- 2022-05-17 CN CN202210532816.3A patent/CN114976472A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106450116A (en) * | 2016-09-27 | 2017-02-22 | 郑州大学 | Novel hydrophobic silica aerogel composite separator for lithium ion battery |
| CN106784558A (en) * | 2017-03-13 | 2017-05-31 | 厦门大学 | Ceramic diaphragm with aeroge as powder and its application in lithium ion battery |
| CN109449355A (en) * | 2018-10-29 | 2019-03-08 | 郑州大学 | A kind of battery modified polyacrylonitrile non-woven fabrics/aerosil composite diaphragm and preparation method thereof |
| CN112062989A (en) * | 2020-08-10 | 2020-12-11 | 航天特种材料及工艺技术研究所 | Polyimide aerogel lithium battery diaphragm and preparation method thereof |
| WO2022067511A1 (en) * | 2020-09-29 | 2022-04-07 | 宁德新能源科技有限公司 | Electrode assembly and manufacturing method therefor, and lithium battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024089218A1 (en) * | 2022-10-27 | 2024-05-02 | Keey Aerogel | Insulating separator for an electric battery |
| FR3141566A1 (en) * | 2022-10-27 | 2024-05-03 | Keey Aerogel | Insulating separator for electric battery |
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