Galvanostatic Intermittent Titration Technique GITT

The self-diffusion coefficient or diffusivity ) is defined by the first Pick s law applied to the chemical  

This relation defines the activity a, for the species i. By combining these two equations, we find  

If the sample is predominantly an electronic conductor (electronic conductivity large compared with the ionic conductivity), so that fg 1, so that  

The schematic illustration of a single step of the GITT method is shown in Fig. 13.3. An electric current /q is driven through the galvanic cell by an external 

Thus AFt is the total transient voltage change of the galvanic cell for the applied current /q. AF is the change of the steady-state voltage of the cell for this step i [6] as shown in Fig. 13.3 that is  

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The galvanostatic intermittent titration technique (GITT) has been first proposed by Weppner and Huggins in 1977 [22], This method is of particular interest for the measurement of ion transport properties in solid intercalation electrodes, used in lithium-ion batteries, for instance [18]. The determination of the diffusion constants relies on Fick s law. The GITT method records the transient potential response of a system to a perturbation signal a current step (/s) is applied for a set time xs, and the change of the potential (E) versus time (0 is recorded (Figure 1.11) [18,22],... 

Galvanostatic Intermittent Titration Technique (GITT) in Combination with EMF-Temperature Measurement... 

The experiment was also made under galvanostatic conditions. This is called the galvanostatic intermittent titration technique (GITT). 

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