Corrosion of lithium in alkaline solution
The corrosion of Li was studied in 3-5M LiOH at 25/sup 0/C and in 4.5M LiOH at 4/sup 0/-60/sup 0/C. The Arrhenius relationship is obeyed and the apparent activation energy for the Li corrosion reaction is found to be 15.5 kcal mole/sup -1/. An empirical relationship is derived from which the corrosion rate, v/sub f/, can be obtained at any molar LiOH. At 25/sup 0/C v/sub f/(kA m/sup -2/) = 0.31(54.1 - 10(LiOH)). An equation is also given which allows calculation of the Li corrosion rate when the metal is anodically polarized. The kinetics of the H/sub 2/ evolution reaction (e.r.) on Li were determined, the transfer coefficient ..cap alpha.. has a value of 0.14. The rate-controlling process of the Li dissolution reaction is the highly polarized H/sub 2/ evolution at cathodic sites. Based on the ..cap alpha.. value obtained, the enthalpy of activation for the H/sub 2/ e.r. on Li at OCV is calculated to be 22.8 kcal mole/sup -1/. It is proposed that the protective film on Li has a duplex structure with a thin oxide/hydroxide layer adjacent to the metal and an outer porous hydrated layer through which the reaction products and reactants can pass freely. 7 figures.
- Research Organization:
- Lockheed Palo Alto Research Labs., CA
- OSTI ID:
- 7253410
- Journal Information:
- J. Electrochem. Soc.; (United States), Vol. 124:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
LITHIUM
CORROSION
LITHIUM-WATER-AIR BATTERIES
ELECTROCHEMISTRY
CHEMICAL REACTIONS
CORROSIVE EFFECTS
ENTHALPY
GASES
HYDROGEN
LITHIUM HYDROXIDES
WATER
ALKALI METAL COMPOUNDS
ALKALI METALS
CHEMISTRY
CRYOGENIC FLUIDS
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELEMENTS
ENERGY STORAGE SYSTEMS
FLUIDS
HYDROGEN COMPOUNDS
HYDROXIDES
LITHIUM COMPOUNDS
METAL-GAS BATTERIES
METALS
NONMETALS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
250902* - Energy Storage- Batteries- Performance & Testing
360105 - Metals & Alloys- Corrosion & Erosion