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. 2019 May 14;7:335. doi: 10.3389/fchem.2019.00335

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Copyright © 2019 Zhang, Zhang and Huang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) XRD patterns of pristine and air-exposed Na_2/3Co_1/6Ni_1/6Mn_2/3O₂ samples, (B) XRD patterns of pristine and air-exposed Na_2/3Co_1/3Mn_2/3O₂ samples, (C) Rietveld refinement of (Na·H₂O)_2/3Co_1/3Mn_2/3O₂, (D) Crystal structure of (Na·H₂O)_2/3Co_1/3Mn_2/3O₂. Reproduced with permission (Lu and Dahn, 2001b). Copyright 2001, American Chemical Society. (E) Water molecules insert into the Na layer of Na_0.7MnO₂ and the change of XRD patterns with the increasing time of water soaking. Reproduced with permission (Franger et al., 2000). Copyright 2000, The Electrochemical Society. (F) XRD patterns of P2-Na_0.62Ni_0.22Mn_0.66Fe_0.1O₂ (NaNMFe), P2-Na_0.61Ni_0.22Mn_0.66Co_0.1O₂ (NaNMCo), P2-Na_0.64Ni_0.22Mn_0.66Cu_0.11O₂ (NaNMCu) and P2-Na_0.64Mn_0.62Cu_0.31O₂ (NaMCu) samples after water soaking, (G) STEM images of pristine and water soaked NaNMFe, NaNMCo, NaNMCu and NaMCu samples. Reproduced with permission (Boyd et al., 2018). Copyright 2018, Royal Society of Chemistry.