A novel active material for the negative electrode in alkaline nickel oxide secondary batteries

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2054997· OSTI ID:7023809

Sakamoto, Y; Kuruma, K; Hirano, S; Hirata, M ^[1]

---

1. Nagasaki Univ. (Japan). Dept. of Materials Science and Engineering

The charge-discharge characteristics of a series of Co[sub 3]Mo compound powder electrodes has been investigated at 303 K, as possible active materials for a negative electrode in alkaline nickel oxide batteries. In addition to the compound powders, other Co-Mo alloys, pure Co powder, and mixtures of Co and Mo powders were also examined. On the first or second cycle, the Co[sub 3]Mo electrodes exhibit a larger discharge capacity, which in some cases exceeds the nominal charge capacity of 450 mAhg[sup [minus]1] for the alloy, and then the discharge capacity decreased rapidly with cycle number, remaining at about 240 mAhg[sup [minus]1] of alloy after 10 cycles. Formation of Co(OH)[sub 2] crystals is observed during the charge-discharge processes, and the negative electrode is not a conventional hydrogen-absorbing and desorbing metal hydride. The new battery is expressed by cobalt oxidation and nickel oxyhydroxide reduction for an overall battery discharge reaction: Co + 2NiOOH + 2H[sub 2]O [yields] Co(OH)[sub 2] + 2Ni(OH)[sub 2] with E[sub cell] = 1.22 V. The observed larger discharge capacity on the first or second cycle, exceeding the nominal charge capacity is related to the desorption reaction of the electrochemically produced and adsorbed hydrogen atoms on the alloy particles, together with the dissolution reaction of cobalt.

• OSTI ID: 7023809
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 141:7; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
ALLOYS
BATTERY CHARGING
CHEMISTRY
COBALT ALLOYS
COBALT COMPOUNDS
COBALT HYDROXIDES
ELECTRIC BATTERIES
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELECTRODES
HYDROGEN COMPOUNDS
HYDROXIDES
INTERMETALLIC COMPOUNDS
METAL-METAL OXIDE BATTERIES
MOLYBDENUM ALLOYS
NICKEL COMPOUNDS
NICKEL HYDROXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VOLTAGE DROP