CN104347836A - Double-layer composite ceramic diaphragm for lithium ion battery - Google Patents
Double-layer composite ceramic diaphragm for lithium ion battery Download PDFInfo
- Publication number
- CN104347836A CN104347836A CN201310356129.1A CN201310356129A CN104347836A CN 104347836 A CN104347836 A CN 104347836A CN 201310356129 A CN201310356129 A CN 201310356129A CN 104347836 A CN104347836 A CN 104347836A
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- Prior art keywords
- film
- layer
- lithium ion
- double
- pottery
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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
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B18/00—Layered products essentially comprising ceramics, e.g. refractory products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- 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
- H01M50/431—Inorganic material
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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 & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Secondary Cells (AREA)
- Cell Separators (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a double-layer composite ceramic diaphragm for a lithium ion battery. The double-layer composite ceramic diaphragm comprises a bottom surface PP (PE) film, a middle ceramic coating and a top surface PP (PE) film, wherein the bottom surface PP (PE) film is coated by the middle ceramic coating; the middle ceramic coating is covered by the top surface PP (PE) film; and the top surface PP (PE) film and the bottom surface PP (PE) film are both provided with micropores, and the diameter dimensions of the micropores are less than 100 nanometers. Because the double-layer PP (PE) film and a ceramic layer are used, the micropore penetrating gap of the integral diaphragm is further thinned by matching the double-layer PP (PE) film with the ceramic layer on the basis of enhancing the integral strength of the diaphragm, so that only lithium ions contained in a battery electrolyte are permitted to penetrate through, and meanwhile, short circuit is prevented by effectively obstructing the contact of the positive pole material and negative pole material of the battery; and in addition, the ceramic layer is covered by the top PP (PE) film, so that the ceramic layer is protected from being damaged in production and use processes, and also the risk of micro short circuit generated when the self penetrating gap of the ceramic layer is high can be prevented.
Description
[technical field]
The present invention relates to lithium-ion-power cell industry, particularly relate to a kind of two-layer compound of lithium ion battery pottery magnetic barrier film.
[background technology]
Lithium ion battery is as a kind of novel energy-storing power supply, it has energy high, operating voltage is high, operating temperature range is wide, volume is little, life-span is long, the advantages such as environmental protection, become rapidly the new Pang in power supply market, and be widely applied to electric automobile, energy storage, in the fields such as mobile communication, and in the part of lithium battery, barrier film is one of interior layer assembly of key, because the Main Function of barrier film is isolated inside battery positive electrode and negative material, only allow that the lithium ion in electrolyte passes, prevent positive and negative pole material from contacting the inside micro-short circuit causing battery, and then cause the self discharge of battery.Therefore the performance of barrier film directly affects the characteristics such as the capacity of battery, cycle life and safety, the barrier film of excellent performance has important effect to the combination property improving battery.
The requirement of electrokinetic cell to barrier film is high, except thickness, surface density, outside these basic demands of mechanical property, also very high requirement is had to the size of diaphragm micro-hole and distribution uniformity, because the size of micropore and distribution directly have influence on the porosity of barrier film, gas permeability, pick up, domestic traditional barrier film, originally be individual layer PP (PE) barrier film, but be limited to domestic production technology, its micropore size dispersion is large, pore size is not of uniform size, homogeneity is poor, maximumly reach about 150nm, easily cause micro-short circuit in battery, far can not reach electrokinetic cell is less than 100nm requirement to diaphragm micro-hole footpath, its high temperature resistance is poor simultaneously, when ambient temperature rises to 80 DEG C, there will be contraction, when temperature is more than 150 DEG C, melting phenomenon can be produced, to such an extent as to domestic battery production enterprise can only depend on for a long time from Japanese import barrier film.Then domestic manufacturer carries out technological improvement to this, one deck pottery magnetosphere is coated with on the surface of individual layer PP (PE) barrier film, utilize the pottery high temperature resistance of magnetic, insulation and material to penetrate physical characteristic, the temperature tolerance substantially increasing barrier film, insulating properties, supportive and the intensity such as gap is little, what make whole barrier film penetrates the further granular in gap simultaneously, solve the micro-short circuit problem that individual layer PP (PE) barrier film causes because pore size is large, allowed diaphragm quality have and significantly promoted.But this technology is slowly found to come with some shortcomings in the application, as, pottery magnetosphere easily damages cutting, move etc. in production process, once pottery magnetosphere somewhere sustains damage or peels off, or pottery magnetosphere self somewhere to penetrate gap larger, furthermore make pottery the PP(PE of magnetic coating attaching place) also to there is pore size large for barrier film, then this barrier film will cause micro-short circuit risk on the whole, drastically influence battery performance.
In view of above drawback, be necessary in fact to provide a kind of two-layer compound of lithium ion battery to make pottery magnetic every mould to overcome above-mentioned defect.
[summary of the invention]
The object of this invention is to provide a kind of two-layer compound pottery magnetic barrier film of lithium ion battery, this further improves the intensity of diaphragm paper, what make barrier film penetrates gap granular more simultaneously, and solves the easily damaged problem of pottery magnetosphere.
To achieve these goals, the present invention adopts following technical scheme: a kind of two-layer compound pottery magnetic barrier film of lithium ion battery, it comprises bottom surface PP (PE) film, middle pottery magnetic coating, end face PP (PE) film, in the middle of described, pottery magnetosphere is coated on bottom surface PP (PE) film, described end face PP (PE) film is covered on middle pottery magnetosphere, described bottom surface PP (PE) film thickness is between 5 μm to 15 μm, described end face PP (PE) film thickness is between 5 μm to 15 μm, in the middle of described, pottery magnetic coating thickness is between 2 μm to 5 μm, described end face PP (PE) film, bottom surface PP (PE) film all has micropore, described micro-pore diameter size is less than 100nm.When the lithium ion in battery electrolyte penetrates barrier film, the gap that penetrates that barrier film is evenly trickle ensure that passing through smoothly of lithium ion, and its close property in good micropore face has intercepted the contact of positive and negative pole material, simultaneously, when bottom PP (PE) diaphragm micro-hole size is large, or pottery magnetosphere because of impaired or self somewhere penetrate gap larger time, PP (PE) barrier film at top can ensure to penetrate the trickle of gap property close with face further.
The invention has the beneficial effects as follows: a kind of two-layer compound pottery magnetic barrier film of lithium ion battery, owing to employing double-deck PP (PE) film and pottery magnetosphere, on the basis that improve barrier film bulk strength, its double-deck PP (PE) film coordinates pottery magnetosphere, the micropore of whole barrier film is penetrated the further granular in gap, while only allowing the lithium ion in battery electrolyte to pass, effectively intercept the contact of cell positive material and negative material, simultaneously, PP (PE) film of its top layer is overlying on pottery magnetosphere, not only protect pottery magnetosphere in production, injury-free in use procedure, and can prevent make pottery magnetosphere self penetrate gap larger time produce micro-short circuit risk.
[accompanying drawing explanation]
Fig. 1 is the schematic diagram of the two-layer compound pottery magnetic barrier film of a kind of lithium ion battery of the present invention;
Fig. 2 is that the electron ion of the two-layer compound pottery magnetic barrier film of a kind of lithium ion battery of the present invention penetrates schematic diagram;
[embodiment]
Please refer to shown in Fig. 1, Fig. 2, below in conjunction with case study on implementation, the invention will be further described.
Bottom PP (PE) film 1 is coated with one deck pottery magnetosphere 2, top layer PP (PE) film 3 is covered again on pottery magnetosphere 2, the thickness of bottom surface PP (PE) film 1 is between 5 μm to 15 μm, the thickness of end face PP (PE) film 3 is between 5 μm to 15 μm, the thickness of middle pottery magnetosphere 2 is between 2 μm to 5 μm, simultaneously, end face PP (PE) film 1, bottom surface PP (PE) film 3 all have micropore 4, and micropore 4 diameter dimension is less than 100nm.This kind of structure, what make whole barrier film by the pottery magnetic gap of the dislocation of the diaphragm micro-hole of levels and pottery magnetosphere penetrates gap refinement more, the close property in micropore face in unit are and homogeneity improve further, ensure lithium ion 4 press L to track pass barrier film time, its battery plus-negative plate material is opened by effectively isolated, when bottom PP (PE) diaphragm micro-hole size is large, or pottery magnetosphere because of impaired or self somewhere penetrate gap larger time, top PP (PE) barrier film can ensure further to penetrate the trickle of gap property close with face.
The two-layer compound pottery magnetic barrier film of a kind of lithium ion battery of the present invention, be not restricted to described in specification and execution mode, therefore additional advantage and amendment can easily be realized for the personnel of familiar field, therefore when not deviating from the spirit and scope of the universal that claim and equivalency range limit, the present invention is not limited to specific details, representational equipment and illustrates here and the examples shown described.
Claims (5)
1. the two-layer compound pottery magnetic barrier film of a lithium ion battery, it comprises bottom surface PP (PE) film, middle pottery magnetic coating, end face PP (PE) film, it is characterized in that: in the middle of described, pottery magnetosphere is coated on bottom surface PP (PE) film, described end face PP (PE) film is covered on middle pottery magnetosphere, and described end face PP (PE) film, bottom surface PP (PE) film all have micropore.
2. the two-layer compound pottery magnetic barrier film of a kind of lithium ion battery according to claim 1, is characterized in that: described bottom surface PP (PE) film thickness is between 5 μm to 15 μm.
3. the two-layer compound pottery magnetic barrier film of a kind of lithium ion battery according to claim 1, is characterized in that: in the middle of described, pottery magnetic coating thickness is between 2 μm to 5 μm.
4. the two-layer compound pottery magnetic barrier film of a kind of lithium ion battery according to claim 1, is characterized in that: described end face PP (PE) film thickness is between 5 μm to 15 μm.
5. the two-layer compound pottery magnetic barrier film of a kind of lithium ion battery according to claim 1, is characterized in that: described micro-pore diameter size is less than 100nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310356129.1A CN104347836A (en) | 2013-08-07 | 2013-08-07 | Double-layer composite ceramic diaphragm for lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310356129.1A CN104347836A (en) | 2013-08-07 | 2013-08-07 | Double-layer composite ceramic diaphragm for lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104347836A true CN104347836A (en) | 2015-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310356129.1A Pending CN104347836A (en) | 2013-08-07 | 2013-08-07 | Double-layer composite ceramic diaphragm for lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104347836A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105374969A (en) * | 2015-10-28 | 2016-03-02 | 惠州市吉美泰电子科技有限公司 | Lithium battery diaphragm with interlayer, lithium battery and manufacturing method of lithium battery diaphragm |
| WO2019101174A1 (en) * | 2017-11-24 | 2019-05-31 | 比亚迪股份有限公司 | Lithium ion battery separator, manufacturing method therefor, and lithium ion battery comprising the separator |
| WO2024168448A1 (en) * | 2023-02-13 | 2024-08-22 | 宁德时代新能源科技股份有限公司 | Separator, preparation method therefor, and secondary battery and electric device related thereto |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6080507A (en) * | 1998-04-13 | 2000-06-27 | Celgard Inc. | Trilayer battery separator |
| CN101707241A (en) * | 2009-11-27 | 2010-05-12 | 青岛生物能源与过程研究所 | Diaphragm for lithium-air battery and preparation method thereof |
| CN102629679A (en) * | 2012-04-28 | 2012-08-08 | 中国科学院理化技术研究所 | Nanofiber lithium ion battery diaphragm material with composite structure and preparation method thereof |
| CN202797131U (en) * | 2012-09-10 | 2013-03-13 | 沈道付 | Special ceramic membrane for lithium ion battery |
| CN203481306U (en) * | 2013-08-07 | 2014-03-12 | 深圳市沃特玛电池有限公司 | Two-layer composite ceramic membrane for lithium ion battery |
-
2013
- 2013-08-07 CN CN201310356129.1A patent/CN104347836A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6080507A (en) * | 1998-04-13 | 2000-06-27 | Celgard Inc. | Trilayer battery separator |
| CN101707241A (en) * | 2009-11-27 | 2010-05-12 | 青岛生物能源与过程研究所 | Diaphragm for lithium-air battery and preparation method thereof |
| CN102629679A (en) * | 2012-04-28 | 2012-08-08 | 中国科学院理化技术研究所 | Nanofiber lithium ion battery diaphragm material with composite structure and preparation method thereof |
| CN202797131U (en) * | 2012-09-10 | 2013-03-13 | 沈道付 | Special ceramic membrane for lithium ion battery |
| CN203481306U (en) * | 2013-08-07 | 2014-03-12 | 深圳市沃特玛电池有限公司 | Two-layer composite ceramic membrane for lithium ion battery |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105374969A (en) * | 2015-10-28 | 2016-03-02 | 惠州市吉美泰电子科技有限公司 | Lithium battery diaphragm with interlayer, lithium battery and manufacturing method of lithium battery diaphragm |
| WO2019101174A1 (en) * | 2017-11-24 | 2019-05-31 | 比亚迪股份有限公司 | Lithium ion battery separator, manufacturing method therefor, and lithium ion battery comprising the separator |
| WO2024168448A1 (en) * | 2023-02-13 | 2024-08-22 | 宁德时代新能源科技股份有限公司 | Separator, preparation method therefor, and secondary battery and electric device related thereto |
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Application publication date: 20150211 |