Diffraction measurements, though important to characterize the overall structural changes on charging and discharging, are unsuitable to discriminate the individual behavior of the transition metals in multi-metal compounds. Thus, element specific X-ray absorption spectra were recorded to determine changes of the oxidation states of as well as individual structural changes around the Ni and Co cations. First, we note that the mixing of the RP-type compound together with carbon and La0.9Ba0.1F2.9 has no influence on the position of the edges, and only . This is also in agreement with the changes of the bond distances around the Ni cation (see Table ), which can be derived from the EXAFS region of the spectra (see Figure ); here, we would like to emphasize that the errors of the bond distances are high and these values should only be interpreted as a general trend. The apical bond distances increase by about 25 pm, whereas the equatorial bonds contract by about 5 pm; the equatorial trend is well supported from the refinement of lattice parameters, which mainly influence them. On discharging the compound to negative potentials, this process seems to be well reversible. The edge position of Ni shifts back close to the original position of the sample before charging, and the bond distances are similar to the sample before charging (see Figure and Figure and Table ). However, we note that the apical anion only moves back to the original position at high discharge capacities.