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Electrochemical properties of O3-NaCoO₂ in Na cells were first reported by Braconnier et al. in 1980 (Braconnier et al. 1980) at almost the same time when those of O3-LiCoO₂ in Li cells were first reported by (Mizushima et al. 1980). O3-NaCoO₂ delivers a reversible capacity of ca. 140 mAh g⁻¹ in the voltage range of 2.5–4.0 V (Figure 1.8) (Yoshida et al. 2013; Lei et al. 2014). As discussed above on O’3-NaMnO₂, O3-NaCoO₂ represents a stepwise voltage profile that is attributed to multiple phase transitions associated with CoO₂-slab gliding and in-plane Na⁺/vacancy ordering in the interslab spacing as described in section 1.2.2.