Decoupling the effect of vacancies and electropositive cations on the anionic redox processes in Na based P2-type layered oxides
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![Fig. 1. (a) Evolution of XRD patterns of P2 type Na 2/3 [Mg y Mn 1 y ]O 2 with y ¼ 0.15, 0.2, 0.25, 0.3, 1/3 and calculated one using the structure data from P2 type structure](https://thumb-eu.123doks.com/thumbv2/123doknet/11552074.296543/4.892.190.702.82.346/fig-evolution-xrd-patterns-calculated-using-structure-structure.webp)
![Fig. 2. Results of Rietveld refinement of XRD patterns of P2-type a) Na 0.72 [Mg 0.31 Mn 0.69 ]O 2 and b) Na 0.63 [□ 0.036 Mg 0.143 Mn 0.82 ]O 2 based on S.G](https://thumb-eu.123doks.com/thumbv2/123doknet/11552074.296543/5.892.55.435.109.164/fig-results-rietveld-refinement-xrd-patterns-type-based.webp)
![Fig. 9. Summary of phase evolution versus Na content upon fi rst charge for Na 0.63 [ □ 0.036 Mg 0.143 Mn 0.82 ]O 2 , Na 0.72 [Mg 0.31 Mn 0.69 ]O 2 with other reported anionic redox active compounds Na 2/3 Zn 2/9 Mn 7/9 O 2 [12], Na 0.59 [ □ 0.1 Mn 0.9 ]O 2](https://thumb-eu.123doks.com/thumbv2/123doknet/11552074.296543/10.892.193.704.80.305/summary-evolution-versus-content-charge-reported-anionic-compounds.webp)
![Figure SI-1: Cyclic voltammetry technique with gradual enlargement of upper voltage limit during the first cycle in the [1.5 or 2.3-4.5 V] vs](https://thumb-eu.123doks.com/thumbv2/123doknet/11552074.296543/14.892.177.688.122.537/figure-cyclic-voltammetry-technique-gradual-enlargement-upper-voltage.webp)
![Figure SI-2: Mn K-edge XANES spectra of (a) ex-situ P2- Na 0.72 [Mg 0.31 Mn 0.69 ]O 2 including pristine, mid-charged(4 V), fully charged(4.5 V), mid-discharged(3.2 V), mid-discharge (2.5 V) and fully discharged (1.5 V) states, compared with](https://thumb-eu.123doks.com/thumbv2/123doknet/11552074.296543/15.892.163.729.436.1003/figure-spectra-including-pristine-discharged-discharge-discharged-compared.webp)
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