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Title: Correlating Transport and Structural Properties in Li 1+xAlxGe2–x(PO 4)3 (LAGP) Prepared from Aqueous Solution

Journal Article · · ACS Applied Materials and Interfaces

Li1+xAlxGe2–x(PO4)3 (LAGP) is a solid lithium-ion conductor belonging to the NASICON family, representing the solid solution of LiGe2(PO4)3 and AlPO4. The typical syntheses of LAGP either involve high-temperature melt-quenching, which is complicated and expensive, or a sol–gel process requiring costly organic germanium precursors. Herein, we report a simple method based on aqueous solutions without the need of ethoxide precursors. Using synchrotron and neutron diffraction, the crystal structure, the occupancies for Al and Ge, and the distribution of lithium were determined. Substitution of germanium by aluminum allows for an increased Li+ incorporation in the material and the actual Li+ content in the sample increases with the nominal Li+ content and a solubility limit is observed for higher aluminum content. By means of impedance spectroscopy, an increase in the ionic conductivity with increasing lithium content is observed. Whereas the lithium ionic conductivity improves, due to the increasing carrier density, the bulk activation energy increases. This correlation suggests that changes in the transport mechanism and correlated motion may be at play in the Li1+xAlxGe2–x(PO4)3 solid solution.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
BASF SE; International Network for Electrochemistry and Batteries; Justus-Liebig-University Giessen; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1434719
Journal Information:
ACS Applied Materials and Interfaces, Vol. 10, Issue 13; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 56 works
Citation information provided by
Web of Science

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Synthesis and Properties of NaSICON‐type LATP and LAGP Solid Electrolytes journal July 2019
Well-defined carbon nanoframes containing bimetal-N-C active sites as efficient bi-functional electrocatalysts for Li-O2 batteries journal November 2018
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Figures / Tables (8)