The effects of lithium doping level on the structural, electrical properties of Li{sup +}-doped BPO{sub 4} solid electrolyte
Graphical abstract: - Highlights: • Better ionic conductivities when 0.05 ≤ x ≤ 0.13. • V{sup ‴}{sub B}+3Li{sub i} model was preferred. • Grain size, lattice strain and Li{sup +}conductivity are closely related. - Abstract: A series of lithium ion conducting solid electrolytes Li{sub x}B{sub 1−x/3}PO{sub 4}(x = 0.01, 0.05, 0.09, 0.13, 0.17, 0.20) is synthesized by a soft-chemistry route. FTIR and XRD measurements reveal that the electrolyte is pure phase of tetragonal structure. AC-impedance spectroscopy (AC-IS) at room temperature shows that Li{sub x}B{sub 1−x/3}PO{sub 4} exhibits higher ionic conductivities in the range 0.05 ≤ x ≤ 0.13, beyond which, the ionic conductivities decrease quickly. Maximum ionic conductivity of the Li{sub x}B{sub 1−x/3}PO{sub 4} reaches 3.35 × 10{sup −5} S cm{sup −1} at room temperature for x = 0.05. Direct current polarizing (DCP) measurement indicates that the decomposition voltage for the solid electrolyte reaches up to 3.7 V. Micro-structure parameters of synthesized Li{sub x}B{sub 1−x/3}PO{sub 4} samples are calculated by Rietveld refinement of X-ray diffraction spectra. The unit-cell parameters, lattice strain, crystal grain size and ionic conductivities of the samples are correlated with the lithium ion doping level x.
- OSTI ID:
- 22341730
- Journal Information:
- Materials Research Bulletin, Vol. 48, Issue 8; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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