Abstract
Electrical properties of Li - ion conducting Li1+xCrxSn2-x(PO4)3 ceramic electrolytes with 0 < x < 1 were studied using electrical impedance spectroscopy in the frequency range of 1 Hz to 10 MHz at room temperature. Impedance analysis showed an increase in bulk and grain boundary conductivity with the increment of x up to x = 0.7. The highest bulk and grain boundary conductivity were 6.52 ×10-6 S cm-1 and 1.62 ×10-6 S cm-1 in the system of Li1.7Cr0.7Sn1.3(PO4)3 at room temperature. The charge carrier concentration,   mobile ion concentration, ionic hopping rate and ionic mobility were calculated by fitting the AC conductivity spectra. The ionic hopping rate and ionic mobility of the compound increased with the substitution of chromium due to the extra interstitial Li+ ions in the system. Additionally, the highest conducting sample with x = 0.7 had a negligible electronic conductivity based on transference number measurements. These results imply that the Li1+xCrxSn2-x(PO4)3 electrolytes obtained in this work can be considered as future candidates for solid state electrolytes. Â
Highlights
Rechargeable lithium ion batteries have dominated the consumer electronics market for decades due to their high specific energy, high efficiency and long life [1]
Lithium analogous sodium superionic conductor (NASICON) structured have received enormous attention after it was first discovered by Hong (1976) [2] and Goodenough et al (1976) [3] in the system of Na1+xZr2SixP3-xO12 [2]
Various studies have focused on lithium analogous Na-superionic conductor (NASICON) structured with the general formula LiM2P3O12 with M = Ti [4, 5], Zr [6, 7],Sn [8,9,10] and etc
Summary
Rechargeable lithium ion batteries have dominated the consumer electronics market for decades due to their high specific energy, high efficiency and long life [1]. It was systematically shown for the first time by Aono et al [19] These authors reported that the increase of ionic conductivity observed in Li1 + xM3+xTi2 − x(PO4) compounds was due both to the increase of the lithium content and to a better connectivity of the grains caused by a density increase associated to segregated phases in grain boundaries acting as binders. Our present study focused on enhancing the ionic conductivity of LiSn2P3O12 parent compound by partially substituting Sn4+ ions with Cr3+ ions In this study, this partial substitution was done with the objectives of creating Li+ interstitial ions to form structures with general formula Li1+xCrxSn2-xP3O12 where Sn4+ → Li+ + Cr3+ with x ranging from 0.1 to 0.9
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