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Review Article Chem Soc Rev Fig. 6 (a) In situ XRD patterns during sodium ion intercalation in P2-NaxCoO2. (Reproduced by permission from ref. 62, Nature Publishing Group, Copyright 2011.) (b) Comparison between the second discharges obtained for a P2-Nax[Co2/3Mn1/3]O2 cell (black curve) and a NaxCoO2 cell (blue curve). (Reproduced with permission from ref. 76, Copyright 2011 The Royal Society of Chemistry.) View Article Online revealed that Co3+/2+ and Mn4+/3+ reactions were involved in the low voltage plateau, as similar behavior was found when Li1+x[Ni1xyCoxMny]O2 was overlithiated on discharge. Yang et al.77 successfully stabilized the P2-Na2/3[Co1xMnx]O2 phase to x = 0.5, although the resulting capacity was limited to 120 mA h g1. Meanwhile, Co3+/2+ and Mn4+/3+ reactions were more dominant in a voltage range of 1.5–2.1 V. Lowering the synthetic temperature to 700 1C resulted in P2/P3-Na2/3- [Co0.5Mn0.5]O2 compound.78 This biphasic compound greatly improved the capacity to 180 mA h g1 at a rate of 0.1C in a voltage range of 1.5–4.3 V compared with pure P2-Na2/3[Co0.5Mn0.5]O2.77 Rate cycling performance at a rate of 5C was also remarkably 3538 | Chem. Soc. Rev., 2017, 46, 3529--3614 This journal is © The Royal Society of Chemistry 2017 Open Access Article. Published on 28 March 2017. Downloaded on 7/1/2019 3:41:21 AM. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.PDF Image | Sodium-ion batteries present and future
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