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Title: Energetics of Ion Transport in NASICON-Type Electrolytes

Journal Article · · Journal of Physical Chemistry. C
 [1];  [1];  [2]
  1. Univ. of Colorado, Boulder, CO (United States)
  2. Univ. de São Paulo (Brazil)

Herein we report a study on the energetics of ion transport in NASICON-type solid electrolytes. A sol–gel procedure was used to synthesize NASICON-type lithium-ion conductors with nominal compositions Li1+XAlXGe2–X(PO4)3 where 0 ≤ X ≤ 0.6. Trends in the conductivity and activation energy, including both enthalpic and entropic contributions, were examined with electrochemical impedance spectroscopy. Physical interpretations of these results are drawn from structural characterizations performed by synchrotron powder X-ray diffraction and Raman spectroscopy. Considering X = 0 → 0.6, we conclude that initial drops in activation energy are driven by a growing Li+ population on M2 sites, while later increases in activation energy are driven by changes in average bottleneck size caused by the Al-for-Ge substitution. Values of the entropy of motion are rationalized physically by considering the changing configurational potential of the mobile Li+ population with changes in X. We conclude that entropic contributions to the free energy of activation amount to ≤22% of the enthalpic contributions at room temperature. Furthermore, these insights suggest that while entropic contributions are not insignificant, more attention should be paid to lowering the activation energy when designing a new NASICON-type conductor.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; DMR-1231048
OSTI ID:
1225088
Journal Information:
Journal of Physical Chemistry. C, Vol. 119, Issue 29; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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Cited By (2)

Structural elucidation of NASICON (Na 3 Al 2 P 3 O 12 ) based glass electrolyte materials: effective influence of boron and gallium journal January 2018
Improving NASICON Sinterability through Crystallization under High-Frequency Electrical Fields journal March 2016