Kinetics of accumulation of the intermetallic compound of nickel and cadmium during storage of charged cadmium electrodes in alkali
When charged cadmium electrodes containing nickelous hydroxide (NHO) are stored in alkali an intermetallic compound (IMC) of the composition Ni/sub 5/Cd/sub 21/ is formed. The appearance of a step corresponding to oxidation of the IMC at a potential more positive by 0.12-0.18 V than the potential of the principal discharge process leads to appreciable lowering of the electrode capacity after storage. A systematic study was carried out of the kinetics of accumulation of the IMC at various temperatures and with additions of various amounts of NHO in order to elucidate the mechanism of formation of the intermetallic compound and to examine the possibility of predicting the loss of capacity of cadmium electrodes during storage. A kinetic equation, which can be used for predicting capacity losses of charged cadmium electrodes because of formation of the intermetallic compound Ni/sub 5/Cd/sub 21/ in them during storage, is proposed. The two-step form of the kinetic curves indicates that the IMC can be formed in cadmium electrodes during storage by two parallel mechanisms, involving both Ni/sup 0/ and Ni/sup 2 +/.
- Research Organization:
- N.G. Chernyshevskii State Univ., Saratov, USSR
- OSTI ID:
- 5322956
- Journal Information:
- J. Appl. Chem. USSR (Engl. Transl.); (United States), Vol. 55:12; Other Information: Translated from Zh. Prikl. Khim.; 55: No. 12, 2704-2707(Dec 1982)
- Country of Publication:
- United States
- Language:
- English
Similar Records
In situ study on the effect of thermomigration on intermetallic compounds growth in liquid-solid interfacial reaction
Electrochemical impregnation of sintered nickel structures with cadmium using constant current step and alternating-current pulse techniques. Interim report, Jan 1971--Jun 1974. [9. 8 Ah/in. /sup 3/, retained 80% of capacity after 750 cycles at 100% depth of discharge]
Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CADMIUM
CHEMICAL REACTION KINETICS
CADMIUM ALLOYS
CHEMICAL REACTION YIELD
NICKEL ALLOYS
NICKEL HYDROXIDES
ALKALI METALS
ELECTRODES
HYDROXIDES
INTERMETALLIC COMPOUNDS
ALLOYS
ELEMENTS
HYDROGEN COMPOUNDS
KINETICS
METALS
NICKEL COMPOUNDS
OXYGEN COMPOUNDS
REACTION KINETICS
TRANSITION ELEMENT COMPOUNDS
YIELDS
250903* - Energy Storage- Batteries- Materials
Components
& Auxiliaries
400400 - Electrochemistry