 The galvanostatic intermittent titration technique, GITT, is commonly used to measure the diffusion coefficient of lithium ions in insertion electrodes. However, this method can be slow and difficult to interpret, so researchers have developed the intermittent current interruption, ICI, method as an alternative. This method uses Fick's law to calculate the diffusion coefficient based on the amount of time it takes for the current to return to its original value after being interrupted. Experiments show that the ICI method produces similar results to those obtained using GITT, but with much shorter measurement times. Additionally, the ICI method can be used to correlate the diffusion coefficient of lithium ions with structural changes observed during operando x-ray diffraction experiments. This article was authored by Yu Chuan-Chien, Haidong Liu, Ashok S. Menon, and others.