Heterovalent substitutions in Na2M2TeO6 family: Crystal structure, fast sodium ion conduction and phase transition of Na2LiFeTeO6

Nalbandyan, V. B.; Петренко, А.А.; Evstigneeva, M. A.

doi:10.1016/j.ssi.2012.12.002

Cited by 43 publications

(36 citation statements)

References 18 publications

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“…Since the fitting procedure showed that the Co 3 O 4 spectrum can be described by a linear combination of 27% of the CoO spectrum and 73% of the sample spectrum, the Co III concentration in the sample was 91(3)%. This means that the average oxidation state of cobalt in the oxide was 2.91 (9). From the formula sum, the calculated theoretical oxidation state was 2.83, assuming that tellurium was only present as Te VI , which was within the experimental errors of this analysis.…”

Section: Physical Propertiessupporting

confidence: 62%

“…The given relative standard deviations were calculated on four different measurements. The ICP-OES analysis revealed a content of 439 ± 7 mg l −1 Co and 147 ± 4 mg l −1 Li within the solution which corresponds to a Li/Co ratio of 2.84 (9). This Li/Co ratio was used for the refinement of the site occupancy parameters of the single-crystal structure data.…”

Section: Characterizationmentioning

confidence: 99%

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Li₃Co_1.06(1)TeO₆: synthesis, single-crystal structure and physical properties of a new tellurate compound with Co^II/Co^IIImixed valence and orthogonally oriented Li-ion channels

et al. 2017

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A tellurate compound with Co/Co mixed valence states and lithium ions within orthogonally oriented channels was realized in LiCoTeO. The single-crystal structure determination revealed two independent and interpenetrating Li/O and (Co,Te)/O substructures with octahedral oxygen coordination of the metal atoms. In contrast to other mixed oxides, a honeycomb-like ordering of CoO and TeO octahedra was not observed. LiCoTeO crystallizes orthorhombically with the following unit cell parameters and refinement results: Fddd, a = 588.6(2), b = 856.7(2), c = 1781.5(4) pm, R = 0.0174, wR = 0.0462, 608 F values, and 33 variables. Additional electron density in tetrahedral voids in combination with neighboring face-linked and under-occupied octahedral lithium sites offers an excellent possible diffusion pathway for lithium ions. According to the symmetry of the crystal structure the diffusion pathways in LiCoTeO were found in two orthogonal orientations. The Co/Co mixed valence was investigated via X-ray photoelectron spectroscopy (XPS), revealing a composition comparable to that derived from single-crystal X-ray diffractometry. Magnetic susceptibility measurements underlined the coexistence of Co and Co, the title compound, however, showed no magnetic ordering down to low temperatures. The ionic conductivity of LiCoTeO was determined via alternating current (AC) electrochemical impedance spectroscopy and was found to be in the range of 1.6 × 10 S cm at 573 K.

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Section: Physical Propertiessupporting

confidence: 62%

Section: Characterizationmentioning

confidence: 99%

Li₃Co_1.06(1)TeO₆: synthesis, single-crystal structure and physical properties of a new tellurate compound with Co^II/Co^IIImixed valence and orthogonally oriented Li-ion channels

et al. 2017

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“…Honeycomb layered oxides generally can be envisaged to adopt the following compositions of ordered s t r u c t u r e s : A + (A + 3/2 L 3+ 1/6 D 6+ 1/3 O 2 ) , where L can be Zn, Mn, Fe, Co, Cu,Ni, Cr, Mg ; D can be Bi, Te, Sb, Ta, Ir, Nb, W, Sn, Ru, Mo, Os ; A and A * can be alkali atoms (such as Li, Cu, K, Rb, Cs, Ag and Na with A = A * ), transition metal atoms, for instance Cu or noble metal atoms (e.g., Ag, Au, Pd, etc.) [1][2][3][4][5][8][9][10][11][17][18][19][20][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] .…”

Section: An Idealised Approach Of Geometry and Topology To The Diffusmentioning

confidence: 99%

“…However, K + has a vastly larger ionic radius with a correspondingly larger inter-layer distance and hence forms weaker inter-layer bonds. Generally, A + cations with larger ionic radii such as K + and Na + form weaker inter-layer bonds in the aforementioned compositions resulting in layered oxides with prismatic or octahedral coordination of alkali metal and oxygen (technically referred to as P-type or O-type layered structures, respectively) 1, [3][4][5][6][7][8][9][10][11][12][13][14][15][16]19,20,27,[34][35][36] . The weaker inter-layer bonds in prismatic layered (P-type) structures create more open voids within the transition metal layers allowing for facile two-dimensional diffusion of alkali atoms within the slabs 41 .…”

Section: An Idealised Approach Of Geometry and Topology To The Diffusmentioning

confidence: 99%

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An idealised approach of geometry and topology to the diffusion of cations in honeycomb layered oxide frameworks

Kanyolo

Masese

2020

Sci Rep

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Honeycomb layered oxides are a novel class of nanostructured materials comprising alkali or coinage metal atoms intercalated into transition metal slabs. The intricate honeycomb architecture and layered framework endows this family of oxides with a tessellation of features such as exquisite electrochemistry, unique topology and fascinating electromagnetic phenomena. Despite having innumerable functionalities, these materials remain highly underutilised as their underlying atomistic mechanisms are vastly unexplored. Therefore, in a bid to provide a more in-depth perspective, we propose an idealised diffusion model of the charged alkali cations (such as lithium, sodium or potassium) in the two-dimensional (2D) honeycomb layers within the multi-layered crystal of honeycomb layered oxide frameworks. This model not only explains the correlation between the excitation of cationic vacancies (by applied electromagnetic fields) and the Gaussian curvature deformation of the 2D surface, but also takes into consideration, the quantum properties of the cations and their inter-layer mixing through quantum tunnelling. Through this work, we offer a novel theoretical framework for the study of multi-layered materials with 2D cationic diffusion currents, as well as providing pedagogical insights into the role of topological phase transitions in these materials in relation to Brownian motion and quantum geometry.

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Solid‐State Electrolyte Materials for Sodium Batteries: Towards Practical Applications

Tietz

2020

ChemElectroChem

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The huge demand for delocalized energy storage due to the application of fluctuating energy sources leads to a need for low‐cost devices available on a large scale and with high energy density. Solid‐state sodium batteries (SSNBs) show great potential in this field and have recently attracted extensive interest. Several review‐type publications have already discussed fundamental materials properties and more academic aspects related to ionic transport and charge transfer. In contrast, the current Review uses state‐of‐the‐art 18650 Li‐ion batteries as a benchmark and evaluates solid‐state electrolytes (SSEs) and corresponding SSNBs in terms of their practical applicability and development status. This Review summarizes recent progress based on key properties of various SSEs, such as ionic conductivities, chemical stabilities, mechanical properties, interface compatibilities with sodium metal, and compares the published SSNBs in detail with respect to galvanostatic cycling and full cell performance. It provides insights and perspectives with respect to SSEs for SSNBs and indicates the direction of future developments for the practical application of SSNBs.

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Heterovalent substitutions in Na2M2TeO6 family: Crystal structure, fast sodium ion conduction and phase transition of Na2LiFeTeO6

Cited by 43 publications

References 18 publications

Li₃Co_1.06(1)TeO₆: synthesis, single-crystal structure and physical properties of a new tellurate compound with Co^II/Co^IIImixed valence and orthogonally oriented Li-ion channels

Li₃Co_1.06(1)TeO₆: synthesis, single-crystal structure and physical properties of a new tellurate compound with Co^II/Co^IIImixed valence and orthogonally oriented Li-ion channels

An idealised approach of geometry and topology to the diffusion of cations in honeycomb layered oxide frameworks

Solid‐State Electrolyte Materials for Sodium Batteries: Towards Practical Applications

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Heterovalent substitutions in Na2M2TeO6 family: Crystal structure, fast sodium ion conduction and phase transition of Na2LiFeTeO6

Cited by 43 publications

References 18 publications

Li3Co1.06(1)TeO6: synthesis, single-crystal structure and physical properties of a new tellurate compound with CoII/CoIIImixed valence and orthogonally oriented Li-ion channels

Li3Co1.06(1)TeO6: synthesis, single-crystal structure and physical properties of a new tellurate compound with CoII/CoIIImixed valence and orthogonally oriented Li-ion channels

An idealised approach of geometry and topology to the diffusion of cations in honeycomb layered oxide frameworks

Solid‐State Electrolyte Materials for Sodium Batteries: Towards Practical Applications

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Li₃Co_1.06(1)TeO₆: synthesis, single-crystal structure and physical properties of a new tellurate compound with Co^II/Co^IIImixed valence and orthogonally oriented Li-ion channels

Li₃Co_1.06(1)TeO₆: synthesis, single-crystal structure and physical properties of a new tellurate compound with Co^II/Co^IIImixed valence and orthogonally oriented Li-ion channels