CN106299204A - A kind of high-safety lithium battery barrier film and preparation method thereof - Google Patents
A kind of high-safety lithium battery barrier film and preparation method thereof Download PDFInfo
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- CN106299204A CN106299204A CN201610779535.2A CN201610779535A CN106299204A CN 106299204 A CN106299204 A CN 106299204A CN 201610779535 A CN201610779535 A CN 201610779535A CN 106299204 A CN106299204 A CN 106299204A
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- Prior art keywords
- barrier film
- lithium battery
- safety lithium
- aluminum oxide
- battery barrier
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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
- 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)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Cell Separators (AREA)
Abstract
The invention discloses a kind of high-safety lithium battery barrier film, described high-safety lithium battery barrier film includes basement membrane and is coated on the coated aluminum oxide coating of basement membrane single or double, and described coated aluminum oxide coating layer thickness is 1～4 μm.The high-safety lithium battery membrane configuration of the present invention is simple, has Thermal shutdown function, and safety is high, can improve battery safety in utilization.The invention also discloses a kind of high-safety lithium battery barrier film preparation method, comprise the following steps: (1) prepares coated aluminum oxide；(2) slurry is prepared；(3) coating is dried.The preparation method processing step of the present invention is simple, workable, is suitable for industrial applications.
Description
Technical field
The present invention relates to technical field of lithium ion, especially relate to a kind of high-safety lithium battery barrier film and preparation thereof
Method.
Background technology
Lithium ion battery has that running voltage is high, energy density big, has extended cycle life, self-discharge rate is little, environmental protection etc.
Advantage, is widely used in portable electric appts and electric automobile.Lithium ion battery by positive and negative electrode material, electrolyte, every
Film and battery case composition.Barrier film, as " the 3rd pole " of battery, is one of interior layer assembly of the key in lithium ion battery.Every
After film Electolyte-absorptive, positive and negative electrode can be isolated, to prevent short circuit, allow the conduction of lithium ion simultaneously.Overcharging or temperature
When degree raises, barrier film intercepts electric current by closed pore and conducts, and prevents blast.The advantage of membrane properties determines the interfacial structure of battery
And internal resistance, and then affect the key characteristics such as the capacity of battery, cycle performance, charging and discharging currents density.The barrier film pair of excellent performance
The combination property improving battery plays important effect.Conventional lithium battery diaphragm is mainly polypropylene (PP), polyethylene
(PE) the polyolefin macromolecular material such as, it has higher hot strength and electrolyte wellability, but these material heat is melted
Temperature is relatively low, and heat stability is poor, and during inside battery thermal runaway, diaphragm retracts causes both positive and negative polarity contact and short-circuit, thus causes
Potential safety hazard.
Summary of the invention
The present invention is to solve the problems referred to above existing for the lithium ion battery separator of prior art, it is provided that Yi Zhongjie
Structure is simple, has Thermal shutdown function, the lithium ion battery separator that safety is high.
Present invention also offers a kind of lithium ion battery separator preparation method, processing step is simple, workable, is suitable for
Industrial applications.
To achieve these goals, the present invention is by the following technical solutions:
A kind of high-safety lithium battery barrier film of the present invention, described high-safety lithium battery barrier film includes basement membrane and is coated on
The coated aluminum oxide coating of basement membrane single or double, described coated aluminum oxide coating layer thickness is 1～4 μm.The barrier film of the present invention exists
Basement membrane single or double scribbles coated aluminum oxide coating, and the coated aluminum oxide in coating is attached in the middle of barrier film and pole piece, can be every
Disconnected both positive and negative polarity, and will not shrink along with diaphragm retracts, for improving battery heat stability, there is significant effect, be coated with simultaneously
The clad of alumina surface can melt when internal temperature of battery raises, and is filled in polyalkene diaphragm micropore, cuts off
Both positive and negative polarity, cuts off electric current and passes through, play the effect of protection lithium ion battery, thus improve battery safety in utilization.
As preferably, described basement membrane is polyalkene diaphragm, thickness 5～40 μm.
As preferably, described polyalkene diaphragm is polyethylene diagrams or polypropylene diaphragm.
A kind of high-safety lithium battery barrier film preparation method, comprises the following steps:
(1) prepare coated aluminum oxide: added by aluminium oxide in covering liquid after ultrasonic disperse, filter, dry, obtain cladding oxygen
Changing aluminum, described covering liquid is made up of the component of following mass percent: 40～50% low-melting-point polyethylene emulsion, 0.1～0.2%
Quaternary ammonium salt, 0.3～0.5% polyoxyethylene stearic acid ester, 0.1～0.3% silane resin acceptor kh-550, surplus is water.Covering liquid
It is the key of the present invention, the coating film that alumina surface one layer of fusing point of formation can be made to be about 100 DEG C, wherein low-melting-point polyethylene
Emulsion is main film former, and polyoxyethylene stearic acid ester is auxiliary film former, and quaternary ammonium salt is antistatic additive, and silane resin acceptor kh-550 is
Dispersion, emulsifying agent, can make nano-silicon nitride dispersed.In covering liquid, each component is the most collaborative, and beneficially aluminium oxide uniformly divides
Dissipating, and between aluminium oxide, bond strength is high, film forming is uniform.
(2) preparing slurry: by 10～30% coated aluminum oxide, 0.1～0.3% binding agent, surplus is the quality hundred of solvent
Divide each component of content stoichiometry, first binding agent is dissolved in solvent, adds coated aluminum oxide ultrasonic disperse, obtain slurry.
(3) coating dry: slurry is evenly applied to basement membrane single or double, dry, obtain high-safety lithium battery every
Film.
As preferably, described alumina particle is 0.1～1 μm.
As preferably, described binding agent is Kynoar or politef.
As preferably, described solvent is N-Methyl pyrrolidone.
Therefore, there is advantages that
(1) barrier film of the present invention scribbles coated aluminum oxide coating at basement membrane single or double, the coated aluminum oxide in coating
It is attached in the middle of barrier film and pole piece, both positive and negative polarity can be cut off, and will not shrink along with diaphragm retracts, thermally-stabilised for improving battery
Property has significant effect, and the clad on coated aluminum oxide surface can melt when internal temperature of battery raises simultaneously, fills out
Fill in polyalkene diaphragm micropore, cut off both positive and negative polarity, cut off electric current and pass through, play the effect of protection lithium ion battery, thus carry
High battery safety in utilization；
(2) disclosing the concrete formula of covering liquid, preparation method processing step is simple, workable, is suitable for industrialization
Application.
Detailed description of the invention
Below by detailed description of the invention, the present invention will be further described.
Embodiment 1
(1) coated aluminum oxide is prepared: add in covering liquid after ultrasonic disperse by the aluminium oxide that particle diameter is 0.1 μm, filter, dry
Dry, obtain coated aluminum oxide, described covering liquid is made up of the component of following mass percent: 40% low-melting-point polyethylene emulsion,
0.1% quaternary ammonium salt, 0.3% polyoxyethylene stearic acid ester, 0.1% silane resin acceptor kh-550, surplus is water；
(2) slurry is prepared: by 10% coated aluminum oxide, 0.1% binding agent (Kynoar), surplus is solvent (N-first
Base ketopyrrolidine) each component of weight/mass percentage composition stoichiometry, first binding agent is dissolved in solvent, adds coated aluminum oxide
Ultrasonic disperse, obtains slurry；
(3) coating is dried: slurry is evenly applied to the polyethylene diagrams one side that thickness is 5 μm, and coating thickness is 1 μm,
Dry, obtain high-safety lithium battery barrier film.
Embodiment 2
(1) coated aluminum oxide is prepared: add in covering liquid after ultrasonic disperse by the aluminium oxide that particle diameter is 0.5 μm, filter, dry
Dry, obtain coated aluminum oxide, described covering liquid is made up of the component of following mass percent: 45% low-melting-point polyethylene emulsion,
0.15% quaternary ammonium salt, 0.4% polyoxyethylene stearic acid ester, 0.2% silane resin acceptor kh-550, surplus is water；
(2) slurry is prepared: by 20% coated aluminum oxide, 0.2% binding agent (politef), surplus is solvent (N-first
Base ketopyrrolidine) each component of weight/mass percentage composition stoichiometry, first binding agent is dissolved in solvent, adds coated aluminum oxide
Ultrasonic disperse, obtains slurry；
(3) coating is dried: slurry being evenly applied to the polypropylene diaphragm that thickness is 20 μm two-sided, coating thickness is 3 μm,
Dry, obtain high-safety lithium battery barrier film.
Embodiment 3
(1) coated aluminum oxide is prepared: add in covering liquid after ultrasonic disperse by the aluminium oxide that particle diameter is 1 μm, filter, dry
Dry, obtain coated aluminum oxide, described covering liquid is made up of the component of following mass percent: 50% low-melting-point polyethylene emulsion,
0.2% quaternary ammonium salt, 0.5% polyoxyethylene stearic acid ester, 0.3% silane resin acceptor kh-550, surplus is water；
(2) slurry is prepared: by 30% coated aluminum oxide, 0.3% binding agent (Kynoar), surplus is solvent (N-first
Base ketopyrrolidine) each component of weight/mass percentage composition stoichiometry, first binding agent is dissolved in solvent, adds coated aluminum oxide
Ultrasonic disperse, obtains slurry；
(3) coating is dried: slurry being evenly applied to the polyethylene diagrams that thickness is 40 μm two-sided, coating thickness is 4 μm,
Dry, obtain high-safety lithium battery barrier film.
The high-safety lithium battery barrier film security performance test result obtained by the various embodiments described above is as follows:
| Test event | Phenomenon |
| Acupuncture | The most on fire, do not explode |
| Short circuit | The most on fire, do not explode |
| Overcharge | The most on fire, do not explode |
It follows that the high-safety lithium battery barrier film security performance of the present invention is excellent, battery safety in utilization can be improved,
It is suitable for popularization and application.
Embodiment described above is the one preferably scheme of the present invention, not makees the present invention any pro forma
Limit, on the premise of without departing from the technical scheme described in claim, also have other variant and remodeling.
Claims (7)
1. a high-safety lithium battery barrier film, it is characterised in that described high-safety lithium battery barrier film includes basement membrane and coating
In the coated aluminum oxide coating of basement membrane single or double, described coated aluminum oxide coating layer thickness is 1～4 μm.
2. according to a kind of high-safety lithium battery barrier film described in right 1, it is characterised in that described basement membrane is polyalkene diaphragm,
Thickness 5～40 μm.
3. according to a kind of high-safety lithium battery barrier film described in right 2, it is characterised in that described polyalkene diaphragm is polyethylene
Barrier film or polypropylene diaphragm.
4. a high-safety lithium battery barrier film preparation method as claimed in claim 1, it is characterised in that include following step
Rapid:
(1) prepare coated aluminum oxide: added by aluminium oxide in covering liquid after ultrasonic disperse, filter, dry, oxidation must be coated with
Aluminum, described covering liquid is made up of the component of following mass percent: 40～50% low-melting-point polyethylene emulsion, 0.1～0.2% season
Ammonium salt, 0.3～0.5% polyoxyethylene stearic acid ester, 0.1～0.3% silane resin acceptor kh-550, surplus is water；
(2) preparing slurry: by 10～30% coated aluminum oxide, 0.1～0.3% binding agent, surplus is that the percent mass of solvent contains
The amount each component of stoichiometry, is first dissolved in binding agent in solvent, adds coated aluminum oxide ultrasonic disperse, obtain slurry；
(3) coating is dried: slurry is evenly applied to basement membrane single or double, dries, obtains high-safety lithium battery barrier film.
High-safety lithium battery barrier film preparation method the most according to claim 4, it is characterised in that described alumina particle
It it is 0.1～1 μm.
High-safety lithium battery barrier film preparation method the most according to claim 4, it is characterised in that described binding agent is poly-
Vinylidene or politef.
High-safety lithium battery barrier film preparation method the most according to claim 4, it is characterised in that described solvent is N-first
Base ketopyrrolidine.
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| CN201610779535.2A CN106299204A (en) | 2016-08-31 | 2016-08-31 | A kind of high-safety lithium battery barrier film and preparation method thereof |
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| CN201610779535.2A CN106299204A (en) | 2016-08-31 | 2016-08-31 | A kind of high-safety lithium battery barrier film and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107492620A (en) * | 2017-08-16 | 2017-12-19 | 广州鹏辉能源科技股份有限公司 | A kind of high-temperature-reslithium lithium battery barrier film and preparation method thereof |
| CN113363666A (en) * | 2021-05-06 | 2021-09-07 | 惠州锂威新能源科技有限公司 | Preparation method of diaphragm, diaphragm and electrochemical device applying diaphragm |
| CN113972443A (en) * | 2021-11-02 | 2022-01-25 | 惠州锂威电子科技有限公司 | Lithium ion battery diaphragm, preparation method and application |
| CN115621660A (en) * | 2022-09-08 | 2023-01-17 | 阜阳隆能科技有限公司 | Composite diaphragm for lithium battery core, lithium battery core and lithium battery |
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| CN102437302A (en) * | 2011-11-25 | 2012-05-02 | 东莞市比比克电子科技有限公司 | Lithium ion battery diaphragm and high temperature thermal-stable lithium ion battery |
| CN102610773A (en) * | 2012-03-06 | 2012-07-25 | 宁德新能源科技有限公司 | Polymer lithium ion battery and diaphragm thereof |
| CN104269505A (en) * | 2014-10-27 | 2015-01-07 | 沧州明珠隔膜科技有限公司 | Composite lithium ion battery diaphragm and preparation method thereof |
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| CN102437302A (en) * | 2011-11-25 | 2012-05-02 | 东莞市比比克电子科技有限公司 | Lithium ion battery diaphragm and high temperature thermal-stable lithium ion battery |
| CN102610773A (en) * | 2012-03-06 | 2012-07-25 | 宁德新能源科技有限公司 | Polymer lithium ion battery and diaphragm thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107492620A (en) * | 2017-08-16 | 2017-12-19 | 广州鹏辉能源科技股份有限公司 | A kind of high-temperature-reslithium lithium battery barrier film and preparation method thereof |
| CN113363666A (en) * | 2021-05-06 | 2021-09-07 | 惠州锂威新能源科技有限公司 | Preparation method of diaphragm, diaphragm and electrochemical device applying diaphragm |
| CN113363666B (en) * | 2021-05-06 | 2022-09-09 | 惠州锂威新能源科技有限公司 | Preparation method of diaphragm, diaphragm and electrochemical device applying diaphragm |
| CN113972443A (en) * | 2021-11-02 | 2022-01-25 | 惠州锂威电子科技有限公司 | Lithium ion battery diaphragm, preparation method and application |
| CN115621660A (en) * | 2022-09-08 | 2023-01-17 | 阜阳隆能科技有限公司 | Composite diaphragm for lithium battery core, lithium battery core and lithium battery |
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