A microcontact impedance study on NASICON-type Li1+xAlxTi2-x(PO4)3 (0 ≤ x ≤ 0.5) single crystals

D. Rettenwander*, A. Welzl, S. Pristat, F. Tietz, S. Taibl, G. J. Redhammer, J. Fleig

*Korrespondierende/r Autor/in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikel

Abstract

We successfully demonstrated the applicability of microcontact impedance spectroscopy (MC IS) on Li+ conducting solid electrolytes and measured the Li+ bulk conductivity (σb) of LiTi2(PO4)3 (LTP) and Li1+xAlxTi2-x(PO4)3 (LATP) single crystals independent of microstructural effects (e.g., grain boundaries, pores, and density). The crystals had a size of about 100 μm in each direction and crystallized with NASICON-type structure (R3¯c). Finite element calculations were performed to validate the impedance data analysis. A strong increase in σb in the order of three magnitudes (3.16 × 10-6 to 1.73 × 10-3 S cm-1) was found after incorporating 0.1 mol Al3+ per formula unit into LTP. Moreover, since the crystal structural changes are almost linear in the LATP system up to x = 0.5, the increase of σb is most probably related to additional Li+ sites at the M3 (36f) position. The additional Li+ leads to a displacement of Li+ occupying the M1 (6b) sites towards the nearest-neighboring M3 position, and therefore opens the fast-conducting pathway within the NASICON structure. A significant change in σb was also observed as the Al3+ content further increased (x = 0.1 to 0.5). The highest σb value of 5.63 × 10-3 S cm-1 was obtained for samples with x = 0.4.

Originalspracheenglisch
Seiten (von - bis)1506-1513
Seitenumfang8
FachzeitschriftJournal of materials chemistry / A
Jahrgang4
Ausgabenummer4
DOIs
PublikationsstatusVeröffentlicht - 17 Dez 2015
Extern publiziertJa

ASJC Scopus subject areas

  • !!Chemistry(all)
  • !!Renewable Energy, Sustainability and the Environment
  • !!Materials Science(all)

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