Relationship Between Current and Electrode Potential

3 Linear Relationship Between Current and Electrode Potential 

The most remarkable point worthy of mention in relation to the physical aspect of the CTs of transition metal oxides and graphite is the linear relationship between the initial current level fin, and the potential step A . In these studies, the term initial current level indicates the value of current at a time of 2-10 s during the CT experiments, rather than at a moment of application of potential step [96]. 

The above argument, along with the evidences presented in Sections 5.3.2.1-5.3.2.2, indicates that other transport mechanisms than diffusion-controlled lithium transport may dominate during the CT experiments. Furthermore, the Ohmic relationship between Jiiu and A indicates that internal cell resistance plays a critical role in lithium intercalation/deintercalation. If this is the case, it is reasonable to suggest that the interfacial flux of lithium ion is determined by the difference between the applied potential E pp and the actual instantaneous electrode potential (t), divided by the internal cell resistance Keen- Consequently, lithium ions barely undergo any real potentiostatic constraint at the electrode/electrolyte interface. This condition is designated as cell-impedance-controlled lithium transport. 

let us examine the current-potential relationship with increasing lithium 

For the sake of clarity of the above argument regarding cell-impedance-controlled lithium transport, it is very useful to determine experimentally the internal cell resistance as a function of the electrode potential, using EIS, and to compare this with the cell resistance as determined with the CT technique. Pyun et al. showed that internal cell resistances estimated via the Eni versus A plot at various lithium contents approximated satisfactorily values determined experimentally with EIS — the sum of the resistances from the electrolyte and conducting substrate, the resistance associated with the particle-to-particle contact among the oxide particles, and the resistance related to the absorption reaction of adsorbed lithium ion into the 

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The electrochemical technique of measuring the relationship between current and electrode potential (polarization curve) is widely used to help understand corrosion behavior. Polarization curves are easily obtained by potentiodynamic methods. The polarization curve is a graphical representation of the dependence of current density (horizontal axis) on electrode potential (vertical axis), and the gradient of the curve is... 

Tibor Erdey-Gruz (1902-1976) was a Hungarian physical chanist, who is most known for his work on transport processes in electrolyte solutions. He woiked with Max Volmer in the development of the relationship between current and electrode potential and is known as the Erdey-Gruz-Volmer equation, which was, in fact, a prototype of the Butler-Volmer equation. 

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