Lithium cation conductivity of solid solutions in Li6-2xMxZr2O7 (M = Mg, Ca, Zn) systems

Glycine-nitrate method is used to synthesize samples in Li6-2xMxZr2O7 (M = Mg, Ca, Zn) systems. Boundaries of single-phase regions of solid solutions based on monoclinic Li6Zr2O7 are roughly determined, temperature dependencies across the range of 300–600°С and concentration dependencies of their co...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-01, Vol.850, p.156809, Article 156809
Main Authors: Kalashnova, Anastasia V., Shekhtman, Georgyi Sh
Format: Article
Language:English
Subjects:
Calcium
Cations
Conductivity
Crystal structure
Electronegativity
Glycine
Glycine-nitrate synthesis
Heterovalent doping
Li+ conductivity
Lithium
Lithium zirconates
Magnesium
Molten salt electrolytes
Solid electrolytes
Solid solutions
Synthesis
Transport properties
Zinc
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Summary:Glycine-nitrate method is used to synthesize samples in Li6-2xMxZr2O7 (M = Mg, Ca, Zn) systems. Boundaries of single-phase regions of solid solutions based on monoclinic Li6Zr2O7 are roughly determined, temperature dependencies across the range of 300–600°С and concentration dependencies of their conductivity are studied. The maximum lithium cation conductivity of the synthesized solid solutions exceeds the conductivity of undoped Li6Zr2O7 by more than two orders of magnitude. The obtained results are compared with the available literature data on the transport properties of Li6Zr2O7 and solid solutions based on it. The influence of electronegativity of M dopants on the transport properties of the investigated solid electrolytes is studied. •Boundaries of solid solutions based on monoclinic Li6Zr2O7 in the Li6-2xMxZr2O7 (M = Mg, Ca, Zn) systems are determined.•Transport properties of solid electrolytes in the Li6-2xMxZr2O7 (M = Mg, Ca, Zn) systems are studied.•Conductivity mechanism in solid solutions obtained by substitution of Li+ for M2+ is considered.•Li+ ion conductivity of the solid solutions exceeds the conductivity of undoped Li6Zr2O7 by two orders of magnitude.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.156809