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Defects in semiconductors can exhibit multiple charge states, which can beused for charge storage applications. Here we consider such charge storage in aseries of oxygen deficient phases of TiO$_2$, known as Magn\'eli phases. TheseTi$_n$O$_{2n-1}$ Magn\'eli phases present well-defined crystalline structures,i. e., their deviation from stoichiometry is accommodated by changes in spacegroup as opposed to point defects. We show that these phases exhibitintermediate bands with the same electronic quadruple donor transitions akin tointerstitial Ti defect levels in TiO$_2$-rutile. Thus, the Magn\'eli phasesbehave as if they contained a very large pseudo-defect density: $\frac{1}{2}$per formula unit Ti$_n$O$_{2n-1}$. Depending on the Fermi Energy the wholematerial will become charged. These crystals are natural charge storagematerials with a storage capacity that rivals the best known supercapacitors.

Charge storage in oxygen deficient phases of TiO$_2$: defect Physics without defects