GB2042013A - A process for the manufacture of separators for galvanic cells - Google Patents
A process for the manufacture of separators for galvanic cells Download PDFInfo
- Publication number
- GB2042013A GB2042013A GB8002211A GB8002211A GB2042013A GB 2042013 A GB2042013 A GB 2042013A GB 8002211 A GB8002211 A GB 8002211A GB 8002211 A GB8002211 A GB 8002211A GB 2042013 A GB2042013 A GB 2042013A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solvent
- separator
- binder
- fibres
- sheet
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000011230 binding agent Substances 0.000 claims abstract description 35
- 239000002904 solvent Substances 0.000 claims abstract description 32
- 239000010425 asbestos Substances 0.000 claims abstract description 13
- 229910052895 riebeckite Inorganic materials 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000007900 aqueous suspension Substances 0.000 claims abstract description 9
- 238000009736 wetting Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 4
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 abstract description 10
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 abstract description 8
- UOCLXMDMGBRAIB-UHFFFAOYSA-N 1,1,1-trichloroethane Chemical compound CC(Cl)(Cl)Cl UOCLXMDMGBRAIB-UHFFFAOYSA-N 0.000 abstract description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 abstract description 3
- 229920002367 Polyisobutene Polymers 0.000 abstract description 3
- 239000004800 polyvinyl chloride Substances 0.000 abstract description 3
- 229920000915 polyvinyl chloride Polymers 0.000 abstract description 3
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical group ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 abstract description 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 abstract description 2
- 229930195733 hydrocarbon Natural products 0.000 abstract description 2
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 2
- 239000004215 Carbon black (E152) Substances 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 14
- 210000004027 cell Anatomy 0.000 description 8
- 238000009835 boiling Methods 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- CWBIFDGMOSWLRQ-UHFFFAOYSA-N trimagnesium;hydroxy(trioxido)silane;hydrate Chemical compound O.[Mg+2].[Mg+2].[Mg+2].O[Si]([O-])([O-])[O-].O[Si]([O-])([O-])[O-] CWBIFDGMOSWLRQ-UHFFFAOYSA-N 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 229910052620 chrysotile Inorganic materials 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 125000002560 nitrile group Chemical group 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- ZXUJWPHOPHHZLR-UHFFFAOYSA-N 1,1,1-trichloro-2-fluoroethane Chemical compound FCC(Cl)(Cl)Cl ZXUJWPHOPHHZLR-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000010908 decantation Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- -1 di- Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 229910001853 inorganic hydroxide Inorganic materials 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002587 poly(1,3-butadiene) polymer Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920006380 polyphenylene oxide Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 210000000352 storage cell Anatomy 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000002110 toxicologic effect Effects 0.000 description 1
- 231100000723 toxicological property Toxicity 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
- D21H13/42—Asbestos
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/02—Chemical or biochemical treatment
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Cell Separators (AREA)
- Paper (AREA)
Abstract
The process includes suspending the fibres e.g. of asbestos, in an aqueous suspension and applying an organic binder such as polyisobutylene, polyvinylchloride or acrylonitrile/butadiene/styrene. The major part of the water is then removed to form a moist sheet which is pressed and dried to form a separator. The separator is then wetted with a solvent such trichloroethane, cyclohexane or dichloroethylene, although many hydrocarbon based solvents may be used. The solvent is removed, usually by allowing it to evaporate.
Description
SPECIFICATION
A process for the manufacture of separators for galvanic cells
The invention relates to a process for the manufacture of separators, having improved
mechanical strength, from
fibre materials and an organic binder, for galvanic cells, particularly but not exclusively for alkaline batteries.
The use of inorganic fibre materials, such as asbestos or glass fibres, or organic fibre materials as the base material for separators in fuel cells and storage cells is known, asbestos being preferred as the fibre material.
To achieve the smallest possible electrical resistance, the separator sheet must have the highest possible porosity; for a good barrier action against electrode slime, the pores must be as small as possible and, furthermore, the separator sheet must possess the highest possible mechanical stability. These demands can only be met by an additional strengthening or bonding of the fibre materials.
In a known process for this purpose, a binder is applied to the fibres present in an aqueous suspension, the major part of the water is then removed by suction or decantation with the simultaneous formation of a crude separator sheet which is still moist. The crude separator sheet is calibrated, if appropriate, by pressing in order to obtain a desired thickness or porosity and is subsequently dried.
A disadvantage of the said process is the inadequate mechanical strength of the separators, in particular of separators consisting of asbestos, in the state wet with alkali or after swelling in the electrolyte. Even with high binder contents of 25% by weight and more, the strength i.e. tear resistance of asbestos separators is too low to enable them to withstand mechanical stresses, such as can occur in electrolysis cells or accumulator cells, for a prolonged period. In the case of a high binder content, it is usually difficult to wet the separators with the electrolyte, and this manifests itself by a higher resistance and reduced gas tightness; furthermore, gas bubbles can become lodged in the interior of the separator, and this leads to an additional increase in the resistance.For this reason, acrylonitrile/butadiene/styrene copolymers have already been employed as binders, the nitrile groups of these copolymers being saponified in alkali, the copolymers thus possessing less hydrophobic properties in spite of the high content of plastics. However, even these separators are not adequately tear-resistant in strong alkali.
It is therefore the object of the invention to produce separators which, in particular in strong alkali, have an increased mechanical strength.
According to the present invention there is provided a process for the manufacture of separators for galvanic cells, from fibres, the process including the steps of placing the fibres in an aqueous suspension, applying an organic binder to the fibres present in the aqueous suspension, removing the major part of the water so as to form a sheet which is still moist, subsequently drying the sheet to form a separator, wetting the separator thus obtained with a solvent for the binder and then removing the solvent.
It is extremely surprising that separators manufactured in a manner which is in itself known can be considerably improved, with respect to their mechanical properties, in a simple manner by wetting them with a solvent for the binder and drying them again.
Wetting can be effected in a very simple manner by immersing the separator sheet into the solvent for the binder. The residence time of the separator sheet in the solvent depends on the dissolving and wetting properties of the solvent and can therefore be varied within wide limits. Even a single brief immersion results, after drying, in a noticeable increase in the wet strength of the separator sheet.
With increasing duration of wetting, the strength of the sheet increases initially, passes through a maximum after a certain period and then starts to decrease again. In view of the large number of possible solvents having different properties, it is not possible to indicate a precise length of time for the treatment of the separator sheet with the solvent; the most favourable duration of the treatment for each case, however, can readily be determined experimentally by a few preliminary tests. It has been found that a treatment of time of from 1 to 10 minutes in general gives us satisfactory results.
The wetting of the separator sheet can be effected not only by immersion in the solution but, for example, also by spraying with the solvent, by sucking solvents through or by condensing solvent vapour on the separator sheet. The temperature at which the wetting takes place depends on the binder used and on the solvent, but it is not critical by itself; however, a treatment temperature above 1 00 C should be avoided since handling of hot solvents is not without hazards. Treatment at room temperature is to be preferred.
After the treatment time has elapsed, the solvent is removed from the separator sheet, usually by evaporation, if appropriate with supply of heat. In the case of a high-boiling solvent, it is sometimes more advantageous to displace the solvent from the separator sheet by means of a lower boiling solvent ur by a fluid which is inert towards the binder and the fibre and then to dry the sheet. The selection of the solvent depends on its chemical, physical and toxicological properties. Solvents having a good solubility for the binder, good wettability of the separator sheet and a boiling point below 1 00 C are preferred because of their good application properties.
The number of suitable solvents is extremely large. Depending on the binder used, suitable solvents are, inter alia, hydrocarbons, for example petroleum fractions, preferably in a boiling range from 40 C to 60' C, saturated.
or unsaturated halogenated hydrocarbons, such as di-, tri- or tetra-chioroethylene, chloroform, tri- and tetra-chloroethane, monofluoro- trichloroethane, aromatic compounds, such as benzene or alkyl-substituted benzenes, low- boiling esters, ketones and ethers After wetting and drying have been carried out, the separator can be subjected to further treatment steps which are in themselves known and customary. A few possibilities. may be enumerated by way of examples: crosslinking of the binder by chemical or physical treatment, grafting of hydrophilic groups onto the binder, saponification of saponifiable groups of the binder or lamination #of the separator sheet to membranes.
The crude separator sheet which is subsequently subjected to the treatment according to the invention is manufactured in the conventional manner. Initially, an organic binder is applied to the fibres, present in an aqueous suspension, of the separator base material and, with removal of the major part of the water, a separator sheet is then produced which is still moist and which is also then calibrated, if appropriate, by pressing and is subsequently dried.
Suitable organic binders are all materials which are inert towards the electrolytes, at least after drying, have adhesive properties towards the fibre material, can be converted into a form which makes it possible to use them in an aqueous suspension of the fibre material, and are, even after drying, still soluble in a solvent or incipiently dissolvable by a solvent. Examples of suitable binders are polymethacrylic acid esters, polysulphones, polyam ides, polyolefines, in particular polyisobutylene, polyacrylonitrile/butadiene/styrene copolymers, polyphenylene oxide, polyvinyl chloride, polyvinyl idene fluoride, butadiene polymers and butadiene/styrene polymers. In general, the binders are used in the form of suspensionsior emulsions in water.Customarily, the aqueous fibre suspension and the binder dispersion are combined, the binder particles being absorbed by the fibres. The preferred process for applying the binder is, however, the precipitation of the binder on the fibre from a common suspension.
The type of asbestos material is in general matched to the particular intended purpose and, under certain circumstances, fibre mixtures are particularly advantageous Chrysotile asbestos can preferably be used for separators in alkaline cells. Those fibre mixtures are also suitable which, in addition to asbestos, also contain proportions of inorganic fibres or plastic fibres. An admixture of plastic fibre materials can influence the strength, and an addition of ion exchangers can produce a selective separating action, for certain types of ion Likewise admixtures of inorganic oxides, hydroxides or other substances which are insoluble or sparingly soluble in the electrolyte can lead to desired effects in galvanic cells.
Finally,. it has been found that the treatment according to the invention also leads to an increased strength of separators consisting of purely organic fibre materials and of those consisting of glass fibre materials.
The advantage which can be achieved by the process according to the invention are not only that it is possible considerably to increase the wet tear resistance of the separator sheet; this increase in strength has also made it possible to keep the proportion of binder in the separator tower than that previously required, and this represents not only a saving of#materiai but is also a great advantage when hydrophobic binders are used.
Example 1 Loosened chrysotile asbestos was suspended in water and homogenised by means of a dispersion agitator. Subsequently, such a quantity of aluminium chloride was dissolved in the suspension that the AICI3 concentration was about 5%, and the suspension was stirred again. By dropwise addition of a polyisobutylene latex, such a quantity of binder was applied to the asbestos fibres that the proportion of binder was T 15% by weight of dry solids. The water was drawn off and an asbestos sheet formed. A sheet, tear-resistant in the dry state, was produced by pressing and drying.
One part of the sheet was stored for 24 hours in 6 M KOH. Afterwards, it was greatly swollen and easily torn.
The other part of the sheet was placed for 5 minutes into trichloroethane and the solvent was allowed to evaporate. The tear resistance was substantially higher and was still satisfactory after several weeks' storage in 6 M KOH at 50 C.
Example 2
An aqueous suspension of chrysotile fibres was prepared as in Example 1 and KAI (SO4# . 12 H20 was dissolved as the precipi, tating agent. Polyvinyl chloride in the form of an emulsion was added and precipitated on the fibre. After the water was removed by suction, the asbestos sheet was pressed and dried. Subsequently, it was held for 3 minutes in the vapour of boiling cyclohexane, the solvent condensing in the surface of the sheet and in the pores. Subsequently, residual solvent was allowed to evaporate. The high tear resistance fully persisted even after 2 months' storage in alkali at 50'C.
Example 3
Loosened chrysotile fibres were dispersed in water together with an acrylonitrile/ butadiene/styrene latex. The plastic was precipitated on the fibre by the addition of
NH4AI(SO4)2 . 12 H20; the water was drawn off and the asbestos sheet pressed to the desired thickness. After removal of the residual water, the separator, which had a binder content of 15% was immersed for 10 minutes in dichloroethylene and the solvent was subsequently evaporated at room temperature.
Afterwards, the nitrile groups present in the binder were saponified in 5% by weight strength KOH. Even after 3 months' storage in 6 M KOH, it was not possible to detect any deterioration in tear resistance.
Claims (6)
1. A process for the manufacture of separators for galvanic cells from fibres, the process including the steps of placing the fibres in an aqueous suspension, applying an organic binder to the fibres present in the aqueous suspension, removing the major part of the water so as to form a sheet which is still moist, subsequently drying the sheet to form a separator, wetting the separator thus obtained with a solvent for the binder and then removing the solvent.
2. A process according to claim 1, wherein the separator is wetted with the solvent for a period of 1 to 10 minutes.
3. A process according to claim 1 or 2 including the step of pressing the still-moist sheet to obtain a predetermined thickness or porosity.
4. A process according to claim 1, 2 or 3 wherein sufficient binder is applied to provide a a separator with a binder content of 15% by weight.
5. A process according to any one of claims 1 to 4 wherein the fibres are asbestos.
6. A process for the manufacture of separators for galvanic cells from asbestos fibres substantially as described herein with reference to any one of the examples.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2902957A DE2902957C2 (en) | 1979-01-26 | 1979-01-26 | Process for the production of separators for galvanic cells |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2042013A true GB2042013A (en) | 1980-09-17 |
| GB2042013B GB2042013B (en) | 1983-04-13 |
Family
ID=6061425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8002211A Expired GB2042013B (en) | 1979-01-26 | 1980-01-23 | Process for the manufacture of separators for galvanic cells |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2902957C2 (en) |
| FR (1) | FR2447613A1 (en) |
| GB (1) | GB2042013B (en) |
| IT (1) | IT1145653B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4522902A (en) * | 1984-05-14 | 1985-06-11 | The B. F. Goodrich Company | Polymeric battery separators |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1829585A (en) * | 1927-11-29 | 1931-10-27 | Celanese Corp | Method of preparing impregnated paper products |
| GB775520A (en) * | 1954-06-11 | 1957-05-22 | Permacel Tape Corp | Impregnated fibrous webs |
| FR1245092A (en) * | 1958-11-26 | 1960-11-04 | United Shoe Machinery Ab | Reinforcement material for toe caps |
| CA845032A (en) * | 1966-12-03 | 1970-06-23 | Hacker Heinz | Gas-tight diaphragms for electrochemical cells |
| DE2104333C3 (en) * | 1971-01-29 | 1978-04-13 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Process for the production of latex-bound asbestos cover layers |
| JPS5536648B2 (en) * | 1972-06-14 | 1980-09-22 | ||
| GB1453951A (en) * | 1973-03-26 | 1976-10-27 | Ici Ltd | Flexible decorative sheet material |
-
1979
- 1979-01-26 DE DE2902957A patent/DE2902957C2/en not_active Expired
-
1980
- 1980-01-23 GB GB8002211A patent/GB2042013B/en not_active Expired
- 1980-01-24 FR FR8001497A patent/FR2447613A1/en active Granted
- 1980-01-25 IT IT47707/80A patent/IT1145653B/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4522902A (en) * | 1984-05-14 | 1985-06-11 | The B. F. Goodrich Company | Polymeric battery separators |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2447613B1 (en) | 1983-11-18 |
| IT1145653B (en) | 1986-11-05 |
| DE2902957A1 (en) | 1980-08-07 |
| IT8047707A0 (en) | 1980-01-25 |
| FR2447613A1 (en) | 1980-08-22 |
| DE2902957C2 (en) | 1983-11-24 |
| GB2042013B (en) | 1983-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1309102C (en) | Battery separator for lithium polymer battery | |
| EP1011158B1 (en) | Battery separator | |
| US3450650A (en) | Method of making porous bodies | |
| JP4618831B2 (en) | Hydrophilic polyolefin | |
| JP2604734B2 (en) | Ion-permeable membrane and method for producing the same | |
| CN106422421B (en) | A kind of method and application of paper modification preparation water-oil separationg film | |
| EP1201001A1 (en) | Improved polymer electrolyte membranes from mixed dispersions | |
| JPH038423A (en) | Coated composite membrane | |
| JP2001081667A (en) | Polymeric sheet | |
| NZ241892A (en) | Lead/sulphuric acid storage battery or separators therefor comprising un-crosslinked natural or synthetic rubber | |
| US4109066A (en) | Polyacrylic acid membranes for electrochemical use | |
| KR19990044472A (en) | Method for producing durable thin film coating of perfluorocarbon ionomer on various base materials | |
| WO2019054422A1 (en) | Separator for nonaqueous secondary battery, and nonaqueous secondary battery | |
| US2543137A (en) | Battery separator | |
| KR20230160282A (en) | Separator coating for LI-ion batteries based on PVDF acrylate latex | |
| JPH0676808A (en) | Battery diaphragm and battery | |
| CN108666509A (en) | A kind of lithium-sulfur cell diaphragm and preparation method thereof, application | |
| GB2038206A (en) | Method of rendering polymers wettable | |
| GB2042013A (en) | A process for the manufacture of separators for galvanic cells | |
| US2884387A (en) | Porous membrane materials and process for producing the same | |
| JPS60136161A (en) | Separator for lithium battery | |
| US20240006624A1 (en) | Free-standing, ion-selective composite membranes | |
| JP3560430B2 (en) | Microporous charged membrane and method for producing the same | |
| CN111063887A (en) | Adhesive, preparation method and slurry | |
| JP3752235B2 (en) | Separator for electronic parts |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |