Sodium-ion batteries present and future

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Review Article Chem Soc Rev Fig. 7 (a) Charge and discharge curves of O03-NaNiO2. (Reproduced with permission from ref. 81, Copyright 2013 The Electrochemical Society.) (b) The first charge and discharge curves of O3-Na[Ni0.5Mn0.5]O2 and (c) structural evolution of Na1􏰣x[Ni0.5Mn0.5]O2 (x = 0–1). (Reproduced with permission from ref. 83, Copyright 2012 American Chemical Society.) (d) Ex situ XRD patterns of O3-Na[Fe0.2(Ni0.5Mn0.5)0.8]O2 at various charge states. (Reproduced with permission from ref. 84, Copyright 2015 American Chemical Society.) (e) DSC traces of desodiated Na1􏰣d[Ni0.75􏰣xFexMn0.25]O2 obtained after charging to 3.9 V. (Reprinted from ref. 85, Copyright 2016, with permission from Elsevier.) View Article Online Ni3+/4+ contributes to high capacity delivery, while optimization of the Ni content in the transition metal layer is important in ensuring capacity retention and thermal properties. 2.1.6. NaxMnO2 and derivatives. In comparison to the other compounds, these compounds are in particular interesting because of the cost effectiveness of the Na and Mn elements. NaxMnO2 (x = 0.44–1) have been extensively investigated as cathode materials since the first report by Parant et al.89 These structures are three-dimensional at lower x values (x = 0–0.44) and two-dimensional at higher x values (x 4 0.5). With a higher 3540 | 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.

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