CN106058123A - Production method for battery separator - Google Patents
Production method for battery separator Download PDFInfo
- Publication number
- CN106058123A CN106058123A CN201610384340.8A CN201610384340A CN106058123A CN 106058123 A CN106058123 A CN 106058123A CN 201610384340 A CN201610384340 A CN 201610384340A CN 106058123 A CN106058123 A CN 106058123A
- Authority
- CN
- China
- Prior art keywords
- ion battery
- lithium ion
- battery separator
- manufacture method
- inorganic material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- 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
- H01M50/411—Organic 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
-
- 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 relates to a production method for a battery separator. The method comprises the following steps of 1, adding a high-molecular polymer material into appointed solvent, and preparing a solution with a polymer mass fraction of 5%-30% by mechanical stirring; 2, adding an inorganic material into the prepared polymer solution, and stirring and mixing the solution to form uniformly dispersed slurry, wherein the mass ratio of the high-molecular polymer solution to the inorganic material is 2:1-25:1; and 3, coating the slurry on one surface or two surfaces of a separator substrate, and thus forming the lithium-ion battery separator. According to the method, the physical structure of the coating can be maintained, when a battery is heated, the shrinkage of the separator can be effectively suppressed, and the security performance of the battery is improved; the inorganic material is of a porous structure, and uniformly distributed between particles behind the surface of the separator substrate and thus a good gap structure can be formed, more electrolyte is adsorbed by the lithium-ion battery produced by using the separator, so that the cycle performance of the battery is improved.
Description
Technical field
The present invention relates to lithium ion battery separator manufacture technology field, be specifically related to the manufacture method of a kind of battery diaphragm.
Background technology
Along with energy and environment problem becomes increasingly conspicuous, the development of electric automobile particularly pure electric automobile is imperative.Make
For the power source of electric automobile, secondary cell the development of performance good and bad directly restriction electric automobile.Lithium ion battery due to
Volume is little, energy density advantages of higher is it is considered to be current the most potential electric automobile power battery.And barrier film is at lithium
Ion battery plays ion channel and separates the effect of both positive and negative polarity, make barrier film macromolecular material mostly be polyethylene, poly-third
Alkene or its mixture, the barrier film that these materials make can occur serious thermal contraction, both positive and negative polarity can be caused to connect when high-temperature heating
Touch short circuit.Lithium ion battery is after long charge and discharge cycles, and electrolyte can constantly be consumed loss, when electrolyte
Content is insufficient for when normally migration requires of lithium ion, and the performance of battery can drastically deteriorate, hence it is evident that shortens its service life.
Summary of the invention
It is an object of the invention to provide the manufacture method of a kind of battery diaphragm, the method can imitate the receipts limiting barrier film
Contracting, improves safety and the cycle life of lithium ion battery.
For achieving the above object, present invention employs techniques below scheme:
The manufacture method of a kind of battery diaphragm, comprises the following steps:
(1) in designated solvent, add macromolecule polymer material, be configured to polymer quality mark through mechanical agitation
It is the solution of 5%～30%；
(2) in the polymer solution configured, add inorganic material, be mixed into finely dispersed slurry by stirring, its
In, the mass ratio of macromolecule polymer solution and inorganic material is 2:1～25:1；
(3) above-mentioned slurry is coated in the single surface or two-sided of barrier film base material, is fabricated to lithium ion battery separator.
In above-mentioned steps, described designated solvent is the one in acetone, METHYLPYRROLIDONE, hexamethylene, water or two
Plant thing mixed above.
Further, the material of described high molecular polymer is sodium alginate, epoxy resin, Kynoar, polypropylene
One or more mixture in amide, hydroxymethyl cellulose, acetic starch.
Described inorganic material is porous particle, and its mean diameter is 0.1～5 μm, and average pore size is 1～100nm, and it compares table
Area is 5-50m2/g。
Further, the inorganic material of this porous particle is BeO, AlN, CaTiO3、MgTiO3、CaZrO3、PbZrO3、
Mg2SiO4、Si3N4、Ba1-xSrxTiO3(0 ＜ x ＜ 1), Ba (ZrxTi1-x)O3(0 ＜ x ＜ 1), (1-x) Ba (Fe0.5Nb0.5)O3/
One or more mixture in xNi (0 ＜ x ＜ 1).
Described barrier film base material is polyethylene film, polypropylene screen or the two above barrier film of the two-layer being compounded to form.
It is 1～5 μm that described slurry is coated on barrier film base material the thickness after drying.
As shown from the above technical solution, the inorganic material on septation base material of the present invention is able to maintain that the physics knot of coat
Structure, plays a supporting role, and can increase the mechanical strength of barrier film, and inorganic material itself has extraordinary resistance to elevated temperatures,
Can effectively limit the contraction of barrier film when battery is heated, improve the security performance of battery；Additionally, inorganic material is loose structure,
Good interstitial structure can be formed again after being evenly distributed on barrier film substrate surface between granule and granule, use this barrier film to manufacture
Lithium ion battery can adsorb more electrolyte, and then improves the cycle performance of battery.
Detailed description of the invention
Embodiment 1
(1) adding sodium alginate in acetone, at room temperature mechanical agitation 5h is prepared as the Sargassum that mass fraction is 10%
Acid sodium solution.
(2) adding AlN material in the sodium alginate soln configured, at 60 DEG C, dispersed with stirring 10h prepares slurry, its
The mass ratio of middle sodium alginate soln and AlN be the mean diameter of 4:1, AlN material be 0.1 μm, its aperture is 1nm, specific surface
Amass as 5m2/g。
(3) above-mentioned slurry is coated on 16 positive and negative two surfaces of μm polypropylene diaphragm base material, thick after one side coated and dried
Degree is 2 μm, and having coated barrier film gross thickness is 20 μm.
(4) it is fabricated to after the coated separator of said method manufacture and positive pole, negative pole being fitted together and inject electrolyte
Lithium ion battery, wherein positive active material preferably phosphoric acid ferrum lithium, lithium ferric manganese phosphate, nickle cobalt lithium manganate etc., negative electrode active material
Preferably graphite-like material with carbon element, lithium ion battery can use the methods such as winding method, lamination-winding combined method to make.
Embodiment 2
(1) adding Kynoar in METHYLPYRROLIDONE, at room temperature mechanical agitation 8h is prepared as quality and divides
Number is the Kynoar solution of 5%.
(2) in the sodium alginate soln configured, CaTiO is added3Material, at 60 DEG C, dispersed with stirring 12h prepares slurry
Material, wherein sodium alginate soln and CaTiO3Mass ratio be 25:1, CaTiO3The mean diameter of material is 5 μm, and its aperture is
100nm, specific surface area is 50m2/g。
(3) above-mentioned slurry is coated on 10 positive and negative two surfaces of μm polypropylene diaphragm base material, thick after one side coated and dried
Degree is 5 μm, and having coated barrier film gross thickness is 20 μm.
(4) positive pole same as in Example 1 for the coated separator of said method manufacture, negative pole and electrolyte are fabricated to lithium from
Sub-battery.
Embodiment 3
(1) adding polyacrylamide in hexamethylene, at room temperature mechanical agitation 8h is prepared as mass fraction is 30%
Polyacrylamide solution.
(2) in the polyacrylamide solution configured, CaZrO is added3Material, at 60 DEG C, dispersed with stirring 16h prepares slurry
Material, wherein the mass ratio of polyacrylamide solution and inorganic material is 25:1, CaTiO3The mean diameter of material is 2 μm, its hole
Footpath is 50nm, and specific surface area is 10m2/g。
(3) above-mentioned slurry is coated on 18 positive and negative two surfaces of μm polypropylene diaphragm base material, thick after one side coated and dried
Degree is 1 μm, and having coated barrier film gross thickness is 20 μm.
(4) positive pole same as in Example 1 for the coated separator of said method manufacture, negative pole and electrolyte are fabricated to lithium from
Sub-battery.
Comparative example 1
Making lithium ion battery with the method identical with embodiment 1 and embodiment 2, except for the difference that its barrier film is selected without painting
The 20 μm plain polypropylene barrier films covered.
Performance evaluation
1, embodiment 1 is cut into mutually isometric with the coated separator in embodiment 2 with uncoated common diaphragm in comparative example 1
Degree and width, place 0.5h in 120 DEG C of baking ovens, is cooled to room temperature test barrier film percent thermal shrinkage, test result after the time of advent
It is shown in Table one.
2, uncoated common diaphragm is used to make by embodiment 1 and embodiment 2 use in coated separator and comparative example 1
Lithium ion battery be circulated performance test, test result is shown in Table two.
One or three kinds of barrier film percent thermal shrinkage performances of table
Table two cycle performance of battery
| 100 circulations | 300 circulations | 600 circulations | |
| Embodiment 1 | 99.1% | 98.4% | 96.6% |
| Embodiment 2 | 98.5% | 98.1% | 96.2% |
| Comparative example 1 | 98.7% | 94.2% | 80.5% |
From table one and table two, the coated separator of Example 1 and Example 2 of the present invention is uncoated with comparative example 1
Common diaphragm is compared, and horizontal percent thermal shrinkage and longitudinal percent thermal shrinkage greatly reduce, and uses in embodiment 1 and embodiment 2
The cycle performance of the lithium ion battery of coated separator of the present invention relatively comparative example 1 has significant advantage, particularly when battery is through 600
After secondary charge and discharge cycles particularly evident.
Embodiment described above is only to be described the preferred embodiment of the present invention, the not model to the present invention
Enclose and be defined, on the premise of designing spirit without departing from the present invention, the those of ordinary skill in the art technical side to the present invention
Various deformation that case is made and improvement, all should fall in the protection domain that claims of the present invention determines.
Claims (8)
1. the manufacture method of a battery diaphragm, it is characterised in that comprise the following steps:
(1) adding macromolecule polymer material in designated solvent, being configured to polymer quality mark through mechanical agitation is 5%
～the solution of 30%；
(2) in the polymer solution configured, add inorganic material, be mixed into finely dispersed slurry by stirring, wherein,
The mass ratio of macromolecule polymer solution and inorganic material is 2:1～25:1；
(3) above-mentioned slurry is coated in the single surface or two-sided of barrier film base material, is fabricated to lithium ion battery separator.
The manufacture method of lithium ion battery separator the most according to claim 1, it is characterised in that: described designated solvent is third
One or more mixture in ketone, METHYLPYRROLIDONE, hexamethylene, water.
The manufacture method of lithium ion battery separator the most according to claim 1, it is characterised in that: described high molecular polymer
Material be the one in sodium alginate, epoxy resin, Kynoar, polyacrylamide, hydroxymethyl cellulose, acetic starch
Or two or more mixture.
The manufacture method of lithium ion battery separator the most according to claim 1, it is characterised in that: described inorganic material is many
Hole granule, its average pore size is 1～100nm.
The manufacture method of lithium ion battery separator the most according to claim 4, it is characterised in that: described inorganic material is
BeO、AlN、CaTiO3、MgTiO3、CaZrO3、PbZrO3、Mg2SiO4、Si3N4、Ba1-xSrxTiO3(0 ＜ x ＜ 1), Ba
(ZrxTi1-x)O3(0 ＜ x ＜ 1), (1-x) Ba (Fe0.5Nb0.5)O3One or more mixture in/xNi (0 ＜ x ＜ 1).
The manufacture method of lithium ion battery separator the most according to claim 4, it is characterised in that: the ratio of described inorganic material
Surface area is 5-50m2/g。
The manufacture method of lithium ion battery separator the most according to claim 1, it is characterised in that: described barrier film base material is poly-
Vinyl film, polypropylene screen or the two above barrier film of the two-layer being compounded to form.
The manufacture method of lithium ion battery separator the most according to claim 1, it is characterised in that: described slurry be coated in every
Thickness after drying on film base material is 1～5 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610384340.8A CN106058123A (en) | 2016-05-29 | 2016-05-29 | Production method for battery separator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610384340.8A CN106058123A (en) | 2016-05-29 | 2016-05-29 | Production method for battery separator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106058123A true CN106058123A (en) | 2016-10-26 |
Family
ID=57172016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610384340.8A Pending CN106058123A (en) | 2016-05-29 | 2016-05-29 | Production method for battery separator |
Country Status (1)
| Country | Link |
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| CN (1) | CN106058123A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638208A (en) * | 2018-12-25 | 2019-04-16 | 合肥国轩精密涂布材料有限责任公司 | A kind of preparation method of organic nano composite diaphragm |
| CN113811638A (en) * | 2019-05-22 | 2021-12-17 | 合肥国轩高科动力能源有限公司 | Housing for a single cell with a heat insulation layer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567434A (en) * | 2009-06-04 | 2009-10-28 | 复旦大学 | Lithium-ion membrane and the application thereof |
| CN102334216A (en) * | 2008-12-19 | 2012-01-25 | 株式会社Lg化学 | High-power lithium secondary battery |
| CN103811702A (en) * | 2014-02-12 | 2014-05-21 | 佛山市金辉高科光电材料有限公司 | Novel ceramic coating polyolefin composite film and preparation method thereof |
| CN104064707A (en) * | 2014-06-09 | 2014-09-24 | 东莞市魔方新能源科技有限公司 | Inorganic/organic composite membrane, preparation method of inorganic/organic composite membrane and lithium ion secondary battery containing membrane |
| CN104752660A (en) * | 2013-12-31 | 2015-07-01 | 比亚迪股份有限公司 | Battery diaphragm and preparation method thereof |
-
2016
- 2016-05-29 CN CN201610384340.8A patent/CN106058123A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102334216A (en) * | 2008-12-19 | 2012-01-25 | 株式会社Lg化学 | High-power lithium secondary battery |
| CN101567434A (en) * | 2009-06-04 | 2009-10-28 | 复旦大学 | Lithium-ion membrane and the application thereof |
| CN104752660A (en) * | 2013-12-31 | 2015-07-01 | 比亚迪股份有限公司 | Battery diaphragm and preparation method thereof |
| CN103811702A (en) * | 2014-02-12 | 2014-05-21 | 佛山市金辉高科光电材料有限公司 | Novel ceramic coating polyolefin composite film and preparation method thereof |
| CN104064707A (en) * | 2014-06-09 | 2014-09-24 | 东莞市魔方新能源科技有限公司 | Inorganic/organic composite membrane, preparation method of inorganic/organic composite membrane and lithium ion secondary battery containing membrane |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638208A (en) * | 2018-12-25 | 2019-04-16 | 合肥国轩精密涂布材料有限责任公司 | A kind of preparation method of organic nano composite diaphragm |
| CN109638208B (en) * | 2018-12-25 | 2021-09-24 | 合肥国轩精密涂布材料有限责任公司 | Preparation method of organic nano composite diaphragm |
| CN113811638A (en) * | 2019-05-22 | 2021-12-17 | 合肥国轩高科动力能源有限公司 | Housing for a single cell with a heat insulation layer |
| CN113811638B (en) * | 2019-05-22 | 2024-03-05 | 合肥国轩高科动力能源有限公司 | Housing for a single cell with a heat insulation layer |
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Application publication date: 20161026 |
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