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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 Na_2/3Cu_xNi_1/3−xMn_2/3O₂ samples (x = 0, 1/12, 1/6 and 1/4) before/after air-exposure, (B) the corresponding charge/discharge profiles. Reproduced with permission (Zheng L. et al., 2017). Copyright 2017, American Chemical Society.