Neutron diffraction studies of the Na-ion battery electrode materials NaCoCr2(PO4)3, NaNiCr2(PO4)3, and Na2Ni2Cr(PO4)3
Author | Ben Yahia, H. |
Author | Essehli, R. |
Author | Avdeev, M. |
Author | Park, J-B. |
Author | Sun, Y-K. |
Author | Al-Maadeed, M. A. |
Author | Belharouak, I. |
Available date | 2021-09-01T10:03:32Z |
Publication Date | 2016 |
Publication Name | Journal of Solid State Chemistry |
Resource | Scopus |
Abstract | The new compounds NaCoCr2(PO4)3, NaNiCr2(PO4)3, and Na2Ni2Cr(PO4)3 were synthesized by sol-gel method and their crystal structures were determined by using neutron powder diffraction data. These compounds were characterized by galvanometric cycling and cyclic voltammetry. NaCoCr2(PO4)3, NaNiCr2(PO4)3, and Na2Ni2Cr(PO4)3 crystallize with a stuffed ?-CrPO4-type structure. The structure consists of a 3D-framework made of octahedra and tetrahedra that are sharing corners and/or edges generating channels along [100] and [010], in which the sodium atoms are located. Of significance, in the structures of NaNiCr2(PO4)3, and Na2Ni2Cr(PO4)3 a statistical disorder Ni2+/Cr3+ was observed on both the 8g and 4a atomic positions, whereas in NaCoCr2(PO4)3 the statistical disorder Co2+/Cr3+ was only observed on the 8g atomic position. When tested as negative electrode materials, NaCoCr2(PO4)3, NaNiCr2(PO4)3, and Na2Ni2Cr(PO4)3 delivered specific capacities of 352, 385, and 368 mA h g-1, respectively, which attests to the electrochemical activity of sodium in these compounds. 2016 Elsevier Inc. All rights reserved. |
Sponsor | The authors thank Qatar Foundation for the financial support allocated to the field of energy storage. They also thank the Center for Advanced Materials (CAM) in Qatar University for carrying out experiments. |
Language | en |
Publisher | Academic Press Inc. |
Subject | Anodes Atoms Crystal atomic structure Cyclic voltammetry Electric batteries Electrochemical electrodes Electrodes Metal ions Neutron diffraction Neutrons Nickel Secondary batteries Sol-gel process Sol-gels Synthesis (chemical) Atomic positions Electrochemical activities Na-ion batteries Negative electrode material Neutron diffraction studies Neutron powder diffraction data Sodium ion batteries Specific capacities Crystal structure |
Type | Article |
Pagination | 103-108 |
Volume Number | 238 |
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