DE1091634B - Process for the production of porous electrode bodies serving as carriers of the active material for alkaline batteries - Google Patents
Process for the production of porous electrode bodies serving as carriers of the active material for alkaline batteriesInfo
- Publication number
- DE1091634B DE1091634B DER17145A DER0017145A DE1091634B DE 1091634 B DE1091634 B DE 1091634B DE R17145 A DER17145 A DE R17145A DE R0017145 A DER0017145 A DE R0017145A DE 1091634 B DE1091634 B DE 1091634B
- Authority
- DE
- Germany
- Prior art keywords
- graphite
- porous electrode
- electrode bodies
- alkaline batteries
- active 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/80—Porous plates, e.g. sintered carriers
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
Description
Verfahren zur Herstellung von als Träger der aktiven Masse dienenden porösen Elektrodenkörpern für alkalische Akkumulatoren Es ist bekannt, daß man poröse Elektrodenkörper aus Kohle oder Graphit hergestellt hat; nichtleitende poröse Elektrodenkörper hat man versucht, durch Zusätze von Graphit oder Metallpulver leitend zu machen, oder man hat deren Porenwände mit einem metallischen Überzug versehen.Process for the preparation of serving as a carrier for the active material porous electrode bodies for alkaline batteries It is known that porous Electrode body made of carbon or graphite; non-conductive porous electrode bodies has one tried to make conductive by adding graphite or metal powder, or their pore walls have been provided with a metallic coating.
Zur praktischen Verwendung kamen diese Herstellungsarten aber nicht. Die Gründe waren folgende: Ein Elektrodenkörper aus Kohle unterlag bei der anodischen Oxydation in der Lauge der völligen Auflösung, der Kohlenstoff hat sich teilweise von der positiven Elektrode gelöst und auf die negative Elektrode niedergeschlagen. Bei Verwendung einer porösen Elektrode aus Graphit ging dieser Zerfall jedoch langsamer. Bei porösen Elektroden aus nichtleitenden Stoffen, beispielsweise Kunstharze, Porzellan, Glas, Magnesiumoxyd, hat man versucht, die Leitfähigkeit durch Beimengung von Metallpulvern oder Graphit zu erlangen. Diese Leitfähigkeit war aber ungenügend, so daß nur ein kleiner Teil der eingebrachten aktiven Masse, z. B. Nickelhydroxyd, wirksam wurde; daher war der Wirkungsgrad schlecht. Das Metallisieren der Porenwände der porösen Elektrode zwecks Erhöhung der Leitfähigkeit führte ebenfalls nicht zum Ziel. Da eine stärkere Metallisierung, z. B. Vernickelung, die Poren schließt, können nur dünne Metallüberzüge verwendet werden. Diese werden aber bei der anodischen Oxydation (Ladung) in Lauge durchoxydiert, so daß keine zusammenhängende Metallschicht mehr erhalten bleibt. Dadurch geht die erzielte Leitfähigkeit wieder verloren.However, these types of production did not come into practical use. The reasons were as follows: A carbon electrode body failed the anodic one Oxidation in the lye of total dissolution, the carbon has partially detached from the positive electrode and deposited on the negative electrode. However, when a porous graphite electrode was used, this disintegration was slower. In the case of porous electrodes made of non-conductive materials, e.g. synthetic resins, porcelain, Glass, magnesium oxide, has been tried to increase the conductivity by adding metal powders or graphite. This conductivity was insufficient, so that only one small part of the introduced active mass, z. B. nickel hydroxide, was effective; therefore, the efficiency was poor. Metallizing the pore walls of the porous Electrode to increase conductivity also failed. There a stronger metallization, e.g. B. Nickel plating, which closes pores, can only thin metal coatings can be used. But these become with the anodic oxidation (Charge) completely oxidized in lye, so that there is no longer a cohesive metal layer preserved. As a result, the conductivity achieved is lost again.
Alle diese Nachteile sind im folgenden erfindungsgemäß behoben. Es ist beobachtet worden, daß Graphit durch anodische Oxydation nicht angegriffen wird, wenn man eine ausreichende Menge Nickel mit Graphit in Form von Pulver mischt und erhitzt. Es bildet sich auf der Oberfläche des Graphits eine voluminöse Nickeloxydschicht, die die unteren Schichten von Nickel und Graphit vor weiterer Auflösung schützt. Ähnlich bildet sich bei der anodischen Oxydation von kompaktem Nickel auf der Oberfläche eine Nickeloxydschicht, die die unteren Schichten vor weiterer Auflösung schützt. Diese Feststellung führte zum Aufbau von porösen Elektrodenkörpern nach folgendem Prinzip: Metallisiertes, d. h. mit einer dünnen Metallschicht überzogenes oder nichtmetallisiertes Graphitpulver oder Graphitgrieß wird mit 10% oder mehr feinem Nickelpulver innig vermischt, gepreßt und gesintert, zweckmäßig bei Temperaturen nahe unter dem Schmelzpunkt des Nickels. Das Nickel diffundiert einerseits in die Poren des Graphits, andererseits verbindet es die Graphitkörner untereinander zu einem festen porösen Elektrodenkörper. Um die Festigkeit und Leitfähigkeit dieser Elektroden noch zu erhöhen, werden in den Körper als Trägerunterlage Drähte, Netze, Bleche usw. eingebracht. Die gewünschte Porosität kann durch Beigabe von Quell-oder Treibmitteln oder nachträglich entziehbaren oder zerstörbaren Füllstoffen erreicht werden. Das Einbringen der aktiven Masse in die Poren der porösen Elektrode erfolgt in bekannter Weise.All these disadvantages are eliminated in the following according to the invention. It it has been observed that graphite is not attacked by anodic oxidation, if you mix a sufficient amount of nickel with graphite in the form of powder and heated. A voluminous nickel oxide layer forms on the surface of the graphite, which protects the lower layers of nickel and graphite from further dissolution. Similarly, with the anodic oxidation of compact nickel, it forms on the surface a nickel oxide layer that protects the lower layers from further dissolution. This finding led to the construction of porous electrode bodies according to the following Principle: Metallized, d. H. coated or unmetallized with a thin metal layer Graphite powder or graphite grit becomes intimate with 10% or more of fine nickel powder mixed, pressed and sintered, expediently at temperatures close to below the melting point of nickel. The nickel diffuses on the one hand into the pores of the graphite, on the other hand it connects the graphite grains to one another to form a solid, porous electrode body. To increase the strength and conductivity of these electrodes, in wires, nets, metal sheets, etc. are introduced into the body as a support base. The desired Porosity can be removed by adding swelling or blowing agents or subsequently or destructible fillers can be achieved. The introduction of the active material into the pores of the porous electrode takes place in a known manner.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER17145A DE1091634B (en) | 1955-07-28 | 1955-07-28 | Process for the production of porous electrode bodies serving as carriers of the active material for alkaline batteries |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER17145A DE1091634B (en) | 1955-07-28 | 1955-07-28 | Process for the production of porous electrode bodies serving as carriers of the active material for alkaline batteries |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1091634B true DE1091634B (en) | 1960-10-27 |
Family
ID=7399904
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DER17145A Pending DE1091634B (en) | 1955-07-28 | 1955-07-28 | Process for the production of porous electrode bodies serving as carriers of the active material for alkaline batteries |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1091634B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1496202B1 (en) * | 1965-09-16 | 1969-10-23 | Rheinisch Westfaelisches Elek | Process for the production of an electrode framework for alkaline accumulators |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE749774C (en) * | 1939-11-11 | 1944-12-05 | Ig Farbenindustrie Ag | Sinter mold in which powder masses are sintered |
GB653235A (en) * | 1947-12-15 | 1951-05-09 | Vogt Hans | A porous electrode for galvanic accumulator elements and a method of producing such electrode |
DE920082C (en) * | 1948-10-20 | 1954-11-11 | Lucien Paul Basset | Molded bodies made of graphite from carrier for the active mass of accumulators and process for their production |
-
1955
- 1955-07-28 DE DER17145A patent/DE1091634B/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE749774C (en) * | 1939-11-11 | 1944-12-05 | Ig Farbenindustrie Ag | Sinter mold in which powder masses are sintered |
GB653235A (en) * | 1947-12-15 | 1951-05-09 | Vogt Hans | A porous electrode for galvanic accumulator elements and a method of producing such electrode |
DE920082C (en) * | 1948-10-20 | 1954-11-11 | Lucien Paul Basset | Molded bodies made of graphite from carrier for the active mass of accumulators and process for their production |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1496202B1 (en) * | 1965-09-16 | 1969-10-23 | Rheinisch Westfaelisches Elek | Process for the production of an electrode framework for alkaline accumulators |
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