Classifications

• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
  • C25B1/00—Electrolytic production of inorganic compounds or non-metals
• • 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
  • H01M4/36—Selection of substances as active materials, active masses, active liquids
  • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
  • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
  • C25B1/00—Electrolytic production of inorganic compounds or non-metals
  • C25B1/01—Products
• • 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
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49108—Electric battery cell making
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49108—Electric battery cell making
  • Y10T29/49115—Electric battery cell making including coating or impregnating

Definitions

• Cobalt oxyhydroxide can be used, for example, in the manufacturing of batteries.
• a battery typically includes one or more galvanic cells- __ (i.e., cells that produce a direct current of electricity) in a finished package. In each cell, two electrodes are separated by an electron insulator, but are joined by an ion-carrying path.
• the electron-carrying path of the battery is external; the path proceeds, via a conductor, through a device where work is done.
• the ion-carrying path of the battery is internal and proceeds via an electrolyte.
• the electrodes are usually composed of dissimilar metal compounds.
• the positive electrode or cathode
• the negative electrode or anode
• the electrolyte generally is composed mainly of an ionizable salt dissolved in a solvent.
• Batteries may be rechargeable; such batteries are called “storage” or “secondary” batteries. Storage batteries can be recharged by passing current through the cells in the opposite direction of discharge current flow. The chemical conditions of the battery are restored, and the cells are ready to be discharged again. Primary batteries, on the other hand, are meant to be discharged to exhaustion once, and then discarded.
• An example of a rechargeable battery is a metallic oxide-hydrogen storage battery.
• the positive electrode of this battery includes a metal oxide, such as nickel hydroxide; the negative electrode includes a hydrogen storage alloy; and the electrolyte includes an alkaline solution.
• An example of an electrode reaction in a nickel hydroxide-hydrogen storage battery is as follows. Positive electrode: discharge
• the positive electrode may be sintered or non-sintered.
• a sintered positive electrode may be formed by coating an electrochemically conductive substrate, such as punched steel plate, with a slurry containing nickel powder; the substrate is then sintered to obtain a porous sintered substrate.
• the pores of the substrate are filled with an active mass (e.g., nickel hydroxide) using a solution infiltration method, in which the substrate is infiltrated with a nickel salt solution, then treated with an alkaline reagent.
• Non-sintered electrodes may be prepared by directly coating a porous substrate with a paste containing the active mass, thereby filling the pores of the substrate.
• Ni(OH) 2 nickel hydroxide
• a conductive path must be formed to charge all of the Ni(OH) 2 particles in the electrode.
• One way to form a conductive path is to add a cobalt compound, such as cobalt oxide (CoO), to the Ni(OH) 2 .
• CoO cobalt oxide
• the CoO is converted to a more conductive form of cobalt, CoOOH.
• the CoOOH forms a conductive network, allowing the Ni(OH) 2 to be fully charged and discharged, as shown in Equation (1).
• the invention features a method of manufacturing conductive CoOOH.
• the method includes providing a positive electrode, a negative electrode, a CoOOH precursor, and a basic solution to form a combination; applying a current to the positive electrode to form conductive CoOOH on the positive electrode; then removing the conductive CoOOH from the combination.
• the CoOOH formed by this method is conductive, meaning that is has a specific conductivity of at least 0J s/cm at a pressure of 2000 kg/cm 2 , and preferably at least 0.5 s/cm, for example 1.0 s/cm, 1.5 s/cm, 2.0 s/cm, or 2.5 s/cm.
• Electrochemically synthesized CoOOH can be used in a variety of applications. For example, it can be combined with nickel hydroxide to form a positive electrode -that can be used in a battery.
• Other features and advantages of the invention will be apparent from the description of the preferred embodiments thereof, and from the claims.
• Fig. 1 is an XRD spectrum of a conductive CoOOH powder
• Figs. 2-9 are SEM micrographs of a conductive CoOOH powder.
• Cobalt oxyhydroxide may be electrochemically synthesized as follows. A positive electrode composed mainly of either nickel (Ni) plate, or nickel foam with CoO paste added, is rolled into a Swiss roll and placed in a Ni can having a number of holes. The can is then placed in a Teflon mesh basket, which in turn is placed in a beaker. A negative electrode composed mainly of platinum (Pt) plate or gauze is added to the beaker.
• Ni nickel
• Pt platinum
• CoO powder is combined with 7M potassium hydroxide (KOH), and the resulting suspension is added to the beaker containing the electrodes. An anodic current is applied to the positive electrode while the KOH solution is agitated. Conductive CoOOH forms on the positive electrode.
• KOH potassium hydroxide
• the reaction mixture contains a brown powder (CoO) in a blue solution.
• the reaction mixture contains a black powder (CoOOH) in a clear solution.
• the CoOOH is removed from the positive electrode.
• Example 1 7 g CoOOH was prepared according to the procedure described above.
• a nickel foam/CoO paste positive electrode was rolled into a Swiss roll and placed in a Ni can.
• 10 g CoO was combined with 450 mL KOH and added to the can.
• a current of 160 mA was applied for 23 hours while the KOH solution was stirred at a rate of 60 rpm.
• the CoOOH formed was a black powder with a specific conductivity of 0.3-1.0 s/cm at a pressure of 2000 kg/cm 2 , and had a hexagonal, plate-like morphology.
• An XRD spectrum of the compound, shown in Fig. 1 confirmed that the compound prepared and isolated was CoOOH.
• Example 2 15 mg CoOOH was prepared according to the procedure described above, using a nickel plate positive electrode, 4 g CoO, and 450 mL KOH. A current of 3 mA was applied for 8 hours, during which time the mixture was stirred at a rate of 60 rpm.
• Example 3 6.5 g CoOOH was prepared according the procedure described above, using a nickel foam/CoO paste positive electrode. 7 g CoO, and 450 mL KOH. A number of holes, spaced approximately 8 mm apart, were punched in the Ni can. A current of 60 mA was applied for 43 hours, during which time the mixture was stirred at a rate of 60 rpm. SEM micrographs of this compound, shown in Figs. 2-5, revealed that the average size of the CoOOH crystals formed using this method was 20 ⁇ m.
• Example 5 A positive electrode containing 5% by weight conductive CoOOH powder, Ni(OH) 2 , binder, thickener, and paste stabilizer was prepared using the procedure described in Gaydos and Luo, "Hydrogen Storage Alloy” — USSN 08/866,192, filed May 30, 1997, which is incorporated by reference in its entirety herein and which is to be commonly owned with the present application. Closed cells including the positive electrode, a negative electrode, and a polypropylene separator were then prepared, also as described in USSN 08/866,192.
• CoOOH in addition to being used in the nickel/metal hydride battery described in Example 5, electrochemically synthesized CoOOH can be used in the preparation of other types of batteries as well, including lithium cobalt batteries.
• the CoOOH can be also used in any other applications where conductive CoOOH is useful.
• Other embodiments are within the claims.

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• Chemical & Material Sciences (AREA)
• Electrochemistry (AREA)
• Inorganic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Metallurgy (AREA)
• Materials Engineering (AREA)
• Engineering & Computer Science (AREA)
• Organic Chemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Battery Electrode And Active Subsutance (AREA)
• Inorganic Compounds Of Heavy Metals (AREA)
• Secondary Cells (AREA)
• Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

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• 1997
  • 1997-09-05 US US08/924,152 patent/US5984982A/en not_active Expired - Lifetime
• 1998
  • 1998-08-28 ZA ZA987862A patent/ZA987862B/xx unknown
  • 1998-09-01 AR ARP980104357A patent/AR017041A1/es unknown
  • 1998-09-02 DE DE69824598T patent/DE69824598T2/de not_active Expired - Lifetime
  • 1998-09-02 WO PCT/US1998/018236 patent/WO1999013131A1/en not_active Ceased
  • 1998-09-02 JP JP2000510912A patent/JP2003523481A/ja active Pending
  • 1998-09-02 AT AT98944685T patent/ATE269431T1/de not_active IP Right Cessation
  • 1998-09-02 EP EP98944685A patent/EP1005579B1/en not_active Expired - Lifetime
  • 1998-09-02 AU AU92165/98A patent/AU9216598A/en not_active Abandoned

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