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AuthorBen Yahia, H.
AuthorEssehli, R.
AuthorAvdeev, M.
AuthorPark, J-B.
AuthorSun, Y-K.
AuthorAl-Maadeed, M. A.
AuthorBelharouak, I.
Available date2021-09-01T10:03:32Z
Publication Date2016
Publication NameJournal of Solid State Chemistry
ResourceScopus
URIhttp://dx.doi.org/10.1016/j.jssc.2016.03.011
URIhttp://hdl.handle.net/10576/22491
AbstractThe 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.
SponsorThe 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.
Languageen
PublisherAcademic Press Inc.
SubjectAnodes
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
TitleNeutron diffraction studies of the Na-ion battery electrode materials NaCoCr2(PO4)3, NaNiCr2(PO4)3, and Na2Ni2Cr(PO4)3
TypeArticle
Pagination103-108
Volume Number238
dc.accessType Abstract Only


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