Galvanostatic intermittent titration technique

Example

Use in Lemonergy

Record specimen, state, instrument, temperature and timing.

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Connected concepts

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Diffusion coefficient

The proportionality constant D in Fick’s first law, in m²/s. It sets how fast a species spreads for a given concentration gradient.

Intermittent current interruption

Pausing the current for a few seconds every few minutes during a slow constant-current cycle and fitting the voltage response against the square root of time. The instant jump gives internal resistance and the slope a diffusion resistance, mapped across the whole state-of-charge range in a single cycle — a fast alternative to GITT.

Open-circuit voltage

The voltage across a cell’s terminals when no current flows and the cell has rested long enough for the voltage to settle. It depends on state of charge and temperature, and a cell whose open-circuit voltage falls unusually fast in storage may have an internal short.

Parameterisation

Measuring or fitting the numbers a model needs: OCV curves, diffusion coefficients, exchange current densities, thicknesses and porosities for a physics model, or resistances and time constants for a circuit model. It is usually most of the modelling effort.

Potentiostatic intermittent titration technique

The voltage-step counterpart of GITT: the potential is stepped and the decaying current recorded, giving the diffusion coefficient from the current transient. It needs a potentiostat rather than a cycler.

References & further reading

Further reading on this topic

These sources provide broader context; they are not presented as citations for every statement in this entry.

1. Battery Test Manual For Electric Vehicles, Revision 3

   Jon P. Christopherson · Idaho National Laboratory · 2015

   Topic background · Performance characterization, pulse resistance/power, life testing and reference performance tests; historical 2015 edition.