CN108428844A - A kind of new modified isolation film - Google Patents
A kind of new modified isolation film Download PDFInfo
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- CN108428844A CN108428844A CN201810234834.7A CN201810234834A CN108428844A CN 108428844 A CN108428844 A CN 108428844A CN 201810234834 A CN201810234834 A CN 201810234834A CN 108428844 A CN108428844 A CN 108428844A
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- Prior art keywords
- isolation film
- coating
- hap
- new modified
- whiskers
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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
-
- 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 belongs to provide a kind of new modified isolation film, including isolation film matrix, at least one surface of isolation film matrix is equipped with coating, HAP (hydroxyapatite) whisker is equipped between isolation film matrix and coating, the coating that is introduced as of HAP whiskers provides chain-shaped network structure, the structure effectively improves the mechanical strength and heat-resistant stability of isolation film, the polyhydroxylated compatibility and cementability improved between coating granule of HAP, the wellability with electrolyte is also promoted simultaneously, to effectively promote the interface homogeneity of lithium ion mobility ability and electric current in lithium ion battery, prevent the formation of side reaction generation and lithium dendrite arm, effectively promote the high rate performance and cyclical stability of battery.
Description
Technical field
The invention belongs to technical field of lithium ion, and in particular to a kind of new modified isolation film.
Background technology
Isolation film is one of four big critical materials of lithium ion battery, paracentesis resistance, heat resistance, electrolyte infiltration and guarantor
Liquid energy power directly affects electrochemical appliance performance.Existing isolation film and compatibility of electrolyte be poor, easily heated fusing, is punctured by foreign object
The problems such as, significantly limit the application of electrochemical appliance.
Modification is to promote the effective ways of isolation film comprehensive performance and effectively applied in the industry, mainly has ceramics to change
Property, polymer modification, organo-mineral complexing be modified.But there is also some problems：Between ceramic particle and with isolation film matrix
Adhesive force it is weak, be easy fall off in process；Ceramic particle promotes only about 10% to the mechanical performance of isolation film, improves
Space is limited；The mechanical strength of polymer modification coating is low, is easily deformed；Organic/inorganic mixed system is due to compatibility
It is weak, it is difficult to effectively to play the advantage of material.
Jiang Shan et al. discloses the preparation method (CN of the lithium ion secondary battery membrane with cross-linked structure composite layer
102888016B), which carries out surface modification by strong oxidant solution to polyolefin micropore basement membrane makes its hydroxylating, passing through
Learning the cross-linked layer that key is linked at membrane surface has lasting functionality, and the surface for reaching lasting is modified.But the preparation method
Hydroxylating proportion is influenced very greatly by grafting rate etc., and hydroxylating proportion is limited, while excessive grafting can cause diaphragm porosity to drop
Risk that is low or even having plug-hole, to be unfavorable for obtaining higher ionic conductivity and chemical property.In addition, the preparation method
Step is more, and preparation process influence factor is more and complicated, is unfavorable for industrialization production.Liang Bo et al. discloses a kind of solid-state polymerization
Object electrolyte perforated membrane film liquid and its film-forming method (CN 104538672B), the invention improve polymerization using polyol
The mechanical performance and internal pore structure of object dielectric film, by control the mass ratio of polyol and polymeric matrix with
The mechanical performance and control film internal pore structure for improving polymer dielectric, make polymer dielectric have good be similar to
The liquid storage space of the three-dimensional structure hole of ellipse and mechanical performance.But complex process, it is of high cost, it is unfavorable for industry metaplasia
Production.
Therefore how preparing efficient function isolation film at low cost and protruding becomes problem in the urgent need to address.
Invention content
The problem of in view of background technology, the purpose of the present invention is to provide a kind of new modified isolation film, energy
Realize low cost, efficiently improve isolation film performance, the coating which includes have high mechanical properties, heat-resistant stability,
And there is strong electrolyte wellability and lithium ion mobility ability.
To achieve the goals above, the present invention adopts the following technical scheme that：
At least one surface of a kind of new modified isolation film, including isolation film matrix, the isolation film matrix is equipped with
Coating is equipped with HAP (hydroxyapatite) whisker between the isolation film matrix and the coating.
Preferably, the isolation film matrix is polyethylene (PE), polypropylene (PP), Kynoar (PVDF), polyester film
(PET), any one of cellulose membrane, polyimide film (PI), PA membrane (PA), spandex or aramid fiber film.
Preferably, the coating is any one of ceramic coating, polymer coating, ceramic/polymer blending coating.
Preferably, the ceramic coating material therefor is aluminium oxide, calcium oxide, zinc oxide, magnesia, titanium dioxide, two
Any one of silica, stannic oxide, zirconium dioxide, ceria, magnesium sulfate.
Preferably, material used in the polymer coating is Kynoar, Kynoar-hexafluoropropene, gathers
Any one of acrylonitrile, polyoxyethylene, polymethyl acrylate, polyethyl acrylate.
Preferably, the HAP whiskers are raphioid fiber, and there is great amount of hydroxy group on HAP whiskers surface.
Preferably, the HAP diameter of whiskers is 0.1~3 μm, and length is 20~300 μm of
Preferably, the addition of HAP whiskers is 0.1%~70%, preferably 5%~20%.
Compared with the existing technology, the present invention has the advantages that：
(1) introducing of the HAP long whiskers in modified isolation film, provides chain-shaped network structure, can be ceramic coating and
Polymer coating provides space frame, effectively improves the structural stability of coating；Network structure increases the machine of coating simultaneously
Tool intensity is effectively improved the puncture-resistant short-circuit capacity of isolation film；
(2) the polyhydroxylated surface of HAP whiskers effectively increases the compatibility with other particles in isolation film and coating, has
Effect promotes the cementability at interface；
(3) the polyhydroxylated surface of HAP whiskers and high-modulus improve the wellability of isolation film and electrolyte, to be promoted
The lithium ion mobility ability of isolation film and the current density homogeneity for ensureing interface, it is therefore prevented that the side reactions such as interface breakage-reparation
Generation and lithium dendrite arm formation, effectively promoted battery high rate performance and cyclical stability.
Description of the drawings
Fig. 1 is that the HAP of the embodiment of the present invention 2 changes surname polymer organic coating morphology figure.
Specific implementation mode
Present disclosure is further illustrated with reference to specific embodiment, but protection scope of the present invention and not only
It is limited only to content described in embodiment.
Comparative example 1
Aluminium oxide and binder Kynoar (PVDF) that mass ratio is 90: 10 are added in solvent deionized water and mixed
Close uniformly be made slurry and make slurry solid content be 40% (quality of aluminium oxide and Kynoar account for aluminium oxide, gather inclined fluorine
The 40% of ethylene, deionized water total amount), then utilize dimple rubbing method by the isolation film matrix of slurry even spread to 9 μ m-thicks
In the wherein one side of polyethylene, wet film is obtained, wet film obtains composite porous isolating membrane after oven drying, wherein coating is dried
Thickness afterwards is 3 μm.
Comparative example 2
Polyacrylonitrile and binder polymethyl acrylate that mass ratio is 96: 4 are added in solvent deionized water and mixed
Slurry is uniformly made and the solid content of slurry is made to be 50%, then utilizes dimple rubbing method by slurry even spread to 20 μ m-thicks
In the polyacrylic wherein one side of isolation film matrix, wet film is obtained, wet film obtains composite porous isolating membrane after oven drying,
In, the thickness after coating drying is 4 μm.
Embodiment 1
Solvent is added in aluminium oxide, HAP whiskers and binder Kynoar (PVDF) that mass ratio is 87: 5: 8 to go
The solid content 50% that slurry is made and makes slurry, wherein 0.1 μm of HAP diameter of whiskers, 100 μm of length are uniformly mixed in ionized water, so
Utilize silk-screen printing that wet film, wet film warp on the two sides of the isolation film matrix polyethylene of slurry even spread to 9 μ m-thicks, will be obtained afterwards
After oven drying, composite porous isolating membrane is obtained, wherein the thickness after the coating drying of isolation film matrix two sides coating is 2 μ
m。
Embodiment 2
Solvent ethylene carbonate is added in polyacrylonitrile, HAP whiskers and epoxy resin of binder that mass ratio is 73: 7: 20
It is uniformly mixed in ester and slurry is made and the solid content of slurry is made to be 55%, wherein HAP diameter of whiskers is 0.1 μm, and 100 μm of length is so
It utilizes extrusion coated method by the isolation film matrix polypropylene two sides of slurry even spread to 20 μ m-thicks afterwards, obtains wet film, wet film
After oven drying, obtain composite porous isolating membrane, wherein isolation film matrix two sides coating coating drying after thickness be
3 μm, coating morphology is as shown in Figure 1.
Embodiment 3
By mass percentage be 90% calcium oxide, polymethyl acrylate, HAP whiskers mixture (wherein 10% is
0.1 μm of diameter, the HAP whiskers of 150 μm of length, residue 80% are worth for calcium oxide and polyacrylic acid, calcium oxide and polyacrylic acid
The mass ratio of methyl esters be 3: 1) and 10% binder Kynoar be added solvent deionized water in be uniformly mixed slurry is made
Expect and the solid content of slurry is made to be 70%, then utilizes transfer coated by slurry even spread to isolation film matrix Kynoar
Wherein one side on, obtain wet film, wet film obtains composite porous isolating membrane after oven drying, wherein coating drying after thickness
Degree is 6 μm.
Embodiment 4
By mass percentage be 85% magnesium sulfate, polyethyl acrylate, HAP whiskers mixture (wherein 20% is
0.3 μm of diameter, the HAP whiskers of 270 μm of length, residue 65% are magnesium sulfate and polyacrylic acid, magnesium sulfate and polyethyl acrylate
Mass ratio be 1: 3) and 15% epoxy resin of binder be added solvent deionized water in be uniformly mixed slurry is made and makes
The solid content of slurry is 70%, then utilizes transfer coated by slurry even spread to isolation film base polyamide wherein one side
On, wet film is obtained, wet film obtains composite porous isolating membrane after oven drying, wherein the thickness after coating drying is 6 μm.
Embodiment 5
By mass percentage be 94% magnesia, Kynoar, HAP whiskers mixture (wherein 40% is straight
0.2 μm of diameter, the HAP whiskers of 240 μm of length, residue 54% are magnesia and Kynoar, magnesia and Kynoar
Mass ratio is 5: 1) and 6% polyfluortetraethylene of binding element be added solvent deionized water in be uniformly mixed slurry is made and makes
The solid content of slurry is 20%, then utilizes dip coated by slurry even spread to isolation film base polyamide imines wherein one side
On, wet film is obtained, wet film obtains composite porous isolating membrane after oven drying, wherein the thickness after coating drying is 5 μm.
It is prepared by lithium rechargeable battery：
(1) preparation of positive plate
By active material cobalt acid lithium, conductive agent conductive carbon, bonding agent Kynoar (PVDF) in mass ratio 96: 2.0:
It is uniformly mixed in 2.0 addition solvent N-methyl pyrilidones (NMP) and anode sizing agent is made, be then coated in current collector aluminum foil,
And be cold-pressed, be sliced after being dried at 85 DEG C, cutting edge, slitting, soldering polar ear, positive plate is made.
(2) preparation of negative plate
Active material graphite, conductive agent conductive carbon, thickener sodium carboxymethylcellulose, binder butadiene-styrene rubber are pressed into quality
Negative electrode slurry is made than being uniformly mixed in 96.5: 1.0: 1.0: 1.5 addition solvent deionized waters, is then coated on copper foil of affluxion body
It is upper and be cold-pressed after being dried at 85 DEG C, be sliced, cutting edge, slitting, soldering polar ear, negative plate is made.
(3) preparation of electrolyte
By LiPF6The LiPF of really a concentration of 1.0mol/L is prepared with ethylene carbonate (EC) and diethyl carbonate (DEC)6(its
In, EC and DEC mass ratioes are 3: 7), obtaining electrolyte.
(4) preparation of lithium rechargeable battery
Positive plate, isolation film, negative plate are wound into battery core, then the battery core is placed in plastic-aluminum bag, injection is above-mentioned
Electrolyte, the processes such as encapsulated, chemical conversion, capacity, is made lithium rechargeable battery.
Using the preparation method of above-mentioned lithium rechargeable battery, the respectively isolation in comparative selection example 1-2 and embodiment 1-5
The corresponding lithium rechargeable battery of film preparation.
The isolation film of comparative example 1-2 and embodiment 1-5 being prepared is obtained using comparative example 1-2 and embodiment 1-5
The performance test that the lithium rechargeable battery of film preparation is isolated uses following flow：
(1) test of the puncture-resistant intensity of isolation film：The wire nail of diameter 0.5mm is with the speed puncture diaphragm of 50mm/min.
(2) test of the percent thermal shrinkage of isolation film：Isolation film is washed into square piece with cutting die, isolation film is put in specific temperature
Constant temperature oven in, taken out after specific time, measure the percent thermal shrinkage of the front and back isolation film of heat treatment.
(3) the cementability test of isolation film：Isolation film is washed into strip with cutting die, with 180 testing coating of high ferro tensiometer
Bonding force.
(4) the low temperature discharge multiplying power test of lithium rechargeable battery：By lithium rechargeable battery, 0.5C multiplying powers are filled at 0 DEG C
Electricity, 2C multiplying power dischargings.Capacity retention ratio calculates as follows：Capacity retention ratio=(after cycle before capacity/cycle of battery battery room
Warm capacity) × 100%.
(5) test of the room temperature cycles performance of lithium rechargeable battery：By 0.5C times at room temperature of lithium rechargeable battery
Rate charges, 0.5C multiplying power dischargings, carries out 500 cycles successively.Capacity retention ratio calculates as follows：Capacity retention ratio=(500 are followed
After ring before capacity/cycle of lithium rechargeable battery lithium rechargeable battery room temperature capacity) × 100%.
Table 1 provides the parameter of comparative example 1-2 and embodiment 1-5.
Table 2 provides the isolation film of comparative example 1-2 and embodiment 1-5 and the performance test results of lithium rechargeable battery.
It can be seen that in embodiment 1 with comparative example 1 due to being added to HAP whiskers from the embodiment 1 in table 1, table 2, although
Although the bonding agent content only 8% (the bonding agent content in comparative example 1 is 10%) in embodiment 1, test obtains viscous
Performance is connect really to be higher by more than one times than the performance in comparative example 1；Simultaneously embodiment test obtain puncture-resistant intensity, high rate performance
And cyclical stability is more high than comparative example 1, illustrates the additions of HAP whiskers to improving the cementability, resistance to of isolation film
Puncture strength, high rate performance, cyclical stability all have apparent effect.
It can be seen that from the performance test results of table 2 compared to comparative example 1 and 2, it is compound in the embodiment of the present invention 1 to 5
The puncture-resistant intensity of the porous isolating membrane of HAP whiskers is greatly improved, while bonding interface and thermal stability are also carried
It is high.Meanwhile the draw ratio of whisker is longer, loading is bigger, network effect is better, shows as better puncture-resistant intensity, interface
Cementability and thermal stability.
Compared to comparative example 1 and 2, lithium ion battery in embodiment 1 to 5 due to the use of high hydroxyl HAP whiskers,
The wellability for greatly improving the compatibility and electrolyte that apply interlayer, to improve the high rate performance and cycle of lithium ion battery
Stability.
The parameter of table 1 comparative example 1-2 and embodiment 1-5
2 comparative example 1-2 of table and the isolation film of embodiment 1-5 and the performance test results of lithium rechargeable battery
Claims (8)
1. a kind of new modified isolation film, including isolation film matrix, it is characterised in that：At least one table of the isolation film matrix
Face is equipped with coating, and HAP (hydroxyapatite) whisker is equipped between the isolation film matrix and the coating.
2. a kind of new modified isolation film according to claim 1, it is characterised in that：The isolation film matrix is polyethylene
(PE), polypropylene (PP), Kynoar (PVDF), polyester film (PET), cellulose membrane, polyimide film (PI), PA membrane
(PA), any one of spandex or aramid fiber film.
3. a kind of new modified isolation film according to claim 1, it is characterised in that：The coating is ceramic coating, gathers
Close object coating, any one of coating is blended in ceramic/polymer.
4. a kind of new modified isolation film according to claim 3, it is characterised in that：The ceramic coating material therefor is
Aluminium oxide, calcium oxide, zinc oxide, magnesia, titanium dioxide, silica, stannic oxide, zirconium dioxide, ceria, sulfuric acid
Any one of magnesium.
5. a kind of new modified isolation film according to claim 3, it is characterised in that：Used in the polymer coating
Material is Kynoar, Kynoar-hexafluoropropene, polyacrylonitrile, polyoxyethylene, polymethyl acrylate, polyacrylic acid
Any one of ethyl ester.
6. a kind of new modified isolation film according to claim 1, it is characterised in that：The HAP whiskers are raphioid fiber,
There is great amount of hydroxy group on HAP whiskers surface.
7. a kind of new modified isolation film according to claim 1, it is characterised in that：The HAP diameter of whiskers be 0.1~
3 μm, length is 20~300 μm.
8. a kind of new modified isolation film according to claim 1, it is characterised in that：The addition of the HAP whiskers is
0.1%~70%, preferably 5%~20%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810234834.7A CN108428844A (en) | 2018-03-22 | 2018-03-22 | A kind of new modified isolation film |
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| CN201810234834.7A CN108428844A (en) | 2018-03-22 | 2018-03-22 | A kind of new modified isolation film |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142159A (en) * | 2021-11-18 | 2022-03-04 | 武汉理工大学 | Polyacrylonitrile/cellulose/hydroxyapatite composite diaphragm and preparation method and application thereof |
| CN114256561A (en) * | 2021-11-19 | 2022-03-29 | 国科广化韶关新材料研究院 | Composite diaphragm for lithium metal battery and preparation method thereof |
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| CN103579552A (en) * | 2012-07-24 | 2014-02-12 | 海洋王照明科技股份有限公司 | Electrochemical power-supply composite membrane and preparation method thereof |
| CN106601967A (en) * | 2017-01-24 | 2017-04-26 | 厦门大学 | Composite ceramic diaphragm and application thereof |
| CN107123766A (en) * | 2017-03-29 | 2017-09-01 | 浙江谜蝶新材料有限公司 | A kind of diaphragm for lithium ion battery and preparation method thereof |
| CN107565081A (en) * | 2017-07-11 | 2018-01-09 | 中国科学院上海硅酸盐研究所 | A kind of hydroxyapatite overlong nanowire based high-temp-resistant battery diaphragm and its application |
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2018
- 2018-03-22 CN CN201810234834.7A patent/CN108428844A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103579552A (en) * | 2012-07-24 | 2014-02-12 | 海洋王照明科技股份有限公司 | Electrochemical power-supply composite membrane and preparation method thereof |
| CN106601967A (en) * | 2017-01-24 | 2017-04-26 | 厦门大学 | Composite ceramic diaphragm and application thereof |
| CN107123766A (en) * | 2017-03-29 | 2017-09-01 | 浙江谜蝶新材料有限公司 | A kind of diaphragm for lithium ion battery and preparation method thereof |
| CN107565081A (en) * | 2017-07-11 | 2018-01-09 | 中国科学院上海硅酸盐研究所 | A kind of hydroxyapatite overlong nanowire based high-temp-resistant battery diaphragm and its application |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142159A (en) * | 2021-11-18 | 2022-03-04 | 武汉理工大学 | Polyacrylonitrile/cellulose/hydroxyapatite composite diaphragm and preparation method and application thereof |
| CN114256561A (en) * | 2021-11-19 | 2022-03-29 | 国科广化韶关新材料研究院 | Composite diaphragm for lithium metal battery and preparation method thereof |
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Application publication date: 20180821 |