The secondary lithium—aluminium electrode at room temperature: II. Kinetics of the electrochemical formation of the lithium—aluminium alloy

✍ Scribed by Y. Geronov; P. Zlatilova; G. Staikov

• Book ID: 103897982
• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 505 KB
• Volume: 12
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(84)80046-4

✦ Synopsis

The kinetics of the electrochemical formation of lithium-aluminium alloy was studied by voltammetric, potentiostatic, and pulse galvanostatic techniques in 1M LiCIO4-propylene carbonate solutions.

It was established that the rate of formation of Li-A! alloy up to a thickness of 30/~m is controlled by the dynamics of the interaction between the two metals. The rate constant for this process was found to be a function of the applied potential with values between 10 -6 and 10 -7 cm/s.

A diffusion coefficient of lithium into aluminium equal to 2.4 X 10 -11 cm2/s was also determined from the initial decay of the potentiostatic transients.

Values of the exchange current density (i0), 2.5 mA/cm 2 at 20 °C, and of the apparent activation energy (AH0) , 4.3 kcal/mol, for the process of lithium incorporation into the ~-phase of lithium-aluminium were found from micropolarization measurements.