Studies on the development of mossy zinc electrodeposits from flowing alkaline electrolytes

Technical Report · Mon Jul 01 00:00:00 EDT 1991

DOI:https://doi.org/10.2172/5299466· OSTI ID:5299466

Mc Vay, L

The initiation and characteristics of mossy zinc electrodeposits have been investigated. Batteries with zinc electrodes are candidates for electric vehicle applications; however, this electrode is prone to form non-compact deposits that contribute to capacity loss and battery failure. Moss is deposited when the current density is far from the limiting current. This morphology first appears only after the bulk deposit is approximately 1 {mu}m thick. In this investigation, the effects of flow rate (Re=0--4000), current density (0--50 mA/cm{sup 2}), concentration of the electroactive species (0.25 and 0.5 M), and the concentration of supporting electrolyte (3, 6, and 12 M) on the initiation of moss were examined. The rotating concentric cylinder electrode was employed for most of the experiments; and a flow channel was used to study the development of morphology. After the experiment, the deposit was characterized using microscopic, x-ray diffraction, and profilometric techniques. 94 refs., 72 figs.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5299466
• Report Number(s): LBL-30843; ON: DE92000961
• Resource Relation: Other Information: Theses (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
ELECTRIC BATTERIES
TESTING
ZINC OXIDES
DEPOSITS
CURRENT DENSITY
ELECTRIC-POWERED VEHICLES
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYTES
FLOW RATE
ION MOBILITY
MASS TRANSFER
POTASSIUM HYDROXIDES
QUANTITY RATIO
SCANNING ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ZINC
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMISTRY
COHERENT SCATTERING
DIFFRACTION
ELECTROCHEMICAL CELLS
ELECTRON MICROSCOPY
ELEMENTS
HYDROGEN COMPOUNDS
HYDROXIDES
METALS
MICROSCOPY
MOBILITY
OXIDES
OXYGEN COMPOUNDS
PARTICLE MOBILITY
POTASSIUM COMPOUNDS
SCATTERING
VEHICLES
ZINC COMPOUNDS
250902* - Energy Storage- Batteries- Performance & Testing
250903 - Energy Storage- Batteries- Materials
Components
& Auxiliaries