CN110429224A - A kind of lithium battery diaphragm and preparation method thereof - Google Patents
A kind of lithium battery diaphragm and preparation method thereof Download PDFInfo
- Publication number
- CN110429224A CN110429224A CN201910559784.4A CN201910559784A CN110429224A CN 110429224 A CN110429224 A CN 110429224A CN 201910559784 A CN201910559784 A CN 201910559784A CN 110429224 A CN110429224 A CN 110429224A
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- China
- Prior art keywords
- lithium battery
- coating
- battery diaphragm
- preparation
- pvdf
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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
-
- 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
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
-
- 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
Abstract
The invention discloses a kind of lithium battery diaphragms and preparation method thereof; belong to technical field of lithium batteries; the lithium battery diaphragm; include base membrane layer and composite coating; the one or both sides of base membrane layer are coated with composite coating; composite coating is the aqueous coating that the mixture of magnesia is mixed to form by Kynoar PVDF and hollow alumina particles or aluminium oxide.The present invention also provides the preparation methods of lithium battery diaphragm.Air permeability, the thermal stability of ceramic coating membrane of the invention are all greatly improved, and ceramic coating peeling force is high, and diaphragm will not lose powder, and be conducive to the promotion of battery capacity conservation rate, improve the cycle life of lithium ion battery.
Description
Technical field
The invention belongs to technical field of lithium batteries, it is related to a kind of lithium battery diaphragm and preparation method thereof.
Background technique
Diaphragm is interior layer assembly crucial in lithium ion battery.The capacity of battery, cycle performance and charging and discharging currents density,
High temperature resistant and high intensity, the key performances such as safety guarantee all have direct relationship with diaphragm.
As the popularization of ternary battery grasps ceramic slurry technology of preparing, diaphragm paint-on technique for promoting independent research lithium
The whole competitiveness of ion battery is played an important role to improving industry chain.Ceramic diaphragm currently on the market is
Alumina build-up is on basement membrane, to enhance the high temperature resistance of basement membrane.But there are complex process, higher costs, and cannot expire
Pes diaphragm is heat-shrinked and cementability, to be unable to satisfy the requirement of lithium ion battery.
Summary of the invention
It is an object of the invention to overcome defect existing in the prior art, a kind of lithium battery diaphragm and its preparation side are provided
Method, this method can improve the multiplying power discharging and cycle performance of lithium ion lithium battery.
Itself the specific technical proposal is:
A kind of lithium battery diaphragm includes base membrane layer and composite coating, and the one or both sides of base membrane layer are coated with composite coating, compound
Coating is the water that the mixture of magnesia is mixed to form by Kynoar (PVDF) and hollow alumina particles or aluminium oxide
Property coating.
Further, the mass ratio of the Kynoar (PVDF), hollow alumina particles and magnesia is 1:1:2.
Further, the mass ratio of the Kynoar (PVDF), aluminium oxide and magnesia is 1:1:2.
Further, the base membrane layer is PP film layer, PE film layer, PP and PE multilayer complex films, and thicknesses of layers is 5-15 μm.
A kind of preparation method of lithium battery diaphragm of the present invention, comprising the following steps:
PVDF and binder are added into deionized water for step 1, mix to and are completely dissolved, and hollow aluminium is then added
It is uniform that particle mixes to powder lot dispersing, and wetting agent is then added and grinds 1-2h, obtains aqueous mixed slurry；
Aqueous mixed slurry is coated on basement membrane side or bilateral and forms aqueous coating by step 2, using 50-80 DEG C of baking oven,
It toasts dry 2-3min and obtains product.
Further, in step 1, the milling time is 1.5h.
Further, in step 2, coating method uses roller coating, spraying or intaglio plate coating.
Compared with prior art, the invention has the benefit that
Air permeability, the thermal stability of ceramic coating membrane of the invention are all greatly improved, and ceramic coating peeling force is high,
Diaphragm will not lose powder, and be conducive to the promotion of battery capacity conservation rate, improve the cycle life of lithium ion battery.
Specific embodiment
Technical solution of the present invention is described in more detail combined with specific embodiments below.
Embodiment 1
A kind of lithium battery diaphragm includes base membrane layer and composite coating, and the one or both sides of base membrane layer are coated with composite coating, compound
Coating is the water that the mixture of magnesia is mixed to form by Kynoar (PVDF) and hollow alumina particles or aluminium oxide
Property coating.
The mass ratio of the Kynoar (PVDF), hollow alumina particles and magnesia is 1:1:2.
The mass ratio of the Kynoar (PVDF), aluminium oxide and magnesia is 1:1:2.
The base membrane layer is PP film layer, and thicknesses of layers is 5 μm.
A kind of preparation method of lithium battery diaphragm of the present invention, comprising the following steps:
PVDF and binder are added into deionized water for step 1, mix to and are completely dissolved, and hollow aluminium is then added
It is uniform that particle mixes to powder lot dispersing, and wetting agent is then added and grinds 1h, obtains aqueous mixed slurry；
Aqueous mixed slurry is coated on basement membrane side or bilateral formation aqueous coating by step 2, using 50 DEG C of baking oven, baking
It dries dry 3min and obtains product.
In step 2, coating method uses roller coating.
Embodiment 2
A kind of lithium battery diaphragm includes base membrane layer and composite coating, and the one or both sides of base membrane layer are coated with composite coating, compound
Coating is the water that the mixture of magnesia is mixed to form by Kynoar (PVDF) and hollow alumina particles or aluminium oxide
Property coating.
The mass ratio of the Kynoar (PVDF), hollow alumina particles and magnesia is 1:1:2.
The mass ratio of the Kynoar (PVDF), aluminium oxide and magnesia is 1:1:2.
The base membrane layer is PE film layer, and thicknesses of layers is 10 μm.
A kind of preparation method of lithium battery diaphragm of the present invention, comprising the following steps:
PVDF and binder are added into deionized water for step 1, mix to and are completely dissolved, and hollow aluminium is then added
It is uniform that particle mixes to powder lot dispersing, and wetting agent is then added and grinds 1.5h, obtains aqueous mixed slurry；
Aqueous mixed slurry is coated on basement membrane side or bilateral formation aqueous coating by step 2, using 65 DEG C of baking oven, baking
It dries dry 2.5min and obtains product.
In step 2, coating method is using spraying.
Embodiment 3
A kind of lithium battery diaphragm includes base membrane layer and composite coating, and the one or both sides of base membrane layer are coated with composite coating, compound
Coating is the water that the mixture of magnesia is mixed to form by Kynoar (PVDF) and hollow alumina particles or aluminium oxide
Property coating.
The mass ratio of the Kynoar (PVDF), hollow alumina particles and magnesia is 1:1:2.
The mass ratio of the Kynoar (PVDF), aluminium oxide and magnesia is 1:1:2.
The base membrane layer is PP and PE multilayer complex films, and thicknesses of layers is 15 μm.
A kind of preparation method of lithium battery diaphragm of the present invention, comprising the following steps:
PVDF and binder are added into deionized water for step 1, mix to and are completely dissolved, and hollow aluminium is then added
It is uniform that particle mixes to powder lot dispersing, and wetting agent is then added and grinds 2h, obtains aqueous mixed slurry；
Aqueous mixed slurry is coated on basement membrane side or bilateral formation aqueous coating by step 2, using 80 DEG C of baking oven, baking
It dries dry 1min and obtains product.
In step 2, coating method uses roller coating, spraying or intaglio plate coating.
The foregoing is only a preferred embodiment of the present invention, the scope of protection of the present invention is not limited to this, it is any ripe
Know those skilled in the art within the technical scope of the present disclosure, the letter for the technical solution that can be become apparent to
Altered or equivalence replacement are fallen within the protection scope of the present invention.
Claims (7)
1. a kind of lithium battery diaphragm, which is characterized in that include base membrane layer and composite coating, the one or both sides of base membrane layer are coated with
Composite coating, composite coating are by Kynoar PVDF and hollow alumina particles or aluminium oxide, the mixture of magnesia
The aqueous coating being mixed to form.
2. lithium battery diaphragm according to claim 1, which is characterized in that the Kynoar PVDF, hollow aluminium
The mass ratio of particle and magnesia is 1:1:2.
3. lithium battery diaphragm according to claim 1, which is characterized in that the Kynoar PVDF, aluminium oxide and oxygen
The mass ratio for changing magnesium is 1:1:2.
4. lithium battery diaphragm according to claim 1, which is characterized in that the base membrane layer be PP film layer, PE film layer, PP with
PE multilayer complex films, thicknesses of layers are 5-15 μm.
5. a kind of preparation method of lithium battery diaphragm described in claim 1, which comprises the following steps:
PVDF and binder are added into deionized water for step 1, mix to and are completely dissolved, and hollow aluminium is then added
It is uniform that particle mixes to powder lot dispersing, and wetting agent is then added and grinds 1-2h, obtains aqueous mixed slurry；
Aqueous mixed slurry is coated on basement membrane side or bilateral and forms aqueous coating by step 2, using 50-80 DEG C of baking oven,
It toasts dry 2-3min and obtains product.
6. the preparation method of lithium battery diaphragm according to claim 5, which is characterized in that in step 1, the milling time is
1.5h。
7. the preparation method of lithium battery diaphragm according to claim 5, which is characterized in that in step 2, coating method uses roller
Painting, spraying or intaglio plate coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910559784.4A CN110429224A (en) | 2019-06-26 | 2019-06-26 | A kind of lithium battery diaphragm and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910559784.4A CN110429224A (en) | 2019-06-26 | 2019-06-26 | A kind of lithium battery diaphragm and preparation method thereof |
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| Publication Number | Publication Date |
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| CN110429224A true CN110429224A (en) | 2019-11-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910559784.4A Pending CN110429224A (en) | 2019-06-26 | 2019-06-26 | A kind of lithium battery diaphragm and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115020915A (en) * | 2022-05-30 | 2022-09-06 | 中材锂膜(常德)有限公司 | Electrochemical diaphragm, preparation method and electrochemical device |
-
2019
- 2019-06-26 CN CN201910559784.4A patent/CN110429224A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115020915A (en) * | 2022-05-30 | 2022-09-06 | 中材锂膜(常德)有限公司 | Electrochemical diaphragm, preparation method and electrochemical device |
| CN115020915B (en) * | 2022-05-30 | 2023-07-25 | 中材锂膜(常德)有限公司 | Electrochemical separator, preparation method and electrochemical device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20191108 |
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| WD01 | Invention patent application deemed withdrawn after publication |