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Thermal regimes of Li‐ion conductivity in β‐eucryptite

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.15173· OSTI ID:1378303
 [1];  [2];  [2];  [1]
  1. Department of Metallurgical and Materials Engineering Colorado School of Mines Golden Colorado
  2. Department of Mechanical Engineering Colorado School of Mines Golden Colorado

Abstract

While it is well‐established that ionic conduction in lithium aluminosilicates proceeds via hopping of Li ions, the nature of the various hoping‐based mechanisms in different temperature regimes has not been fully elucidated. The difficulties associated with investigating the conduction have to do with the presence of grains and grain boundaries of different orientations in these usually polycrystalline materials. Herein, we use electrochemical impedance spectroscopy ( EIS ) to investigate the ion conduction mechanisms in β‐eucryptite, which is a prototypical lithium aluminosilicate. In the absence of significant structural transitions in grain boundaries, we find that there are three conduction regimes for the one‐dimensional ionic motion along the c axis channels in the grains, and determine the activation energies for each of these temperature regimes. Activation energies computed from molecular statics calculations of the potential energy landscape encountered by Li ions suggest that at temperatures below 440°C conduction proceeds via cooperative or correlated motion, in agreement with established literature. Between 440°C and 500°C, the activation barriers extracted from EIS measurements are large and consistent with those from atomistic calculations for uncorrelated Li ion hopping. Above 500°C the activation barriers decrease significantly, which indicates that after the transition to the Li‐disordered phase of β‐eucryptite, the Li ion motion largely regains the correlated character.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; FG02-07ER46397
OSTI ID:
1378303
Alternate ID(s):
OSTI ID: 1541596
Journal Information:
Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 1 Vol. 101; ISSN 0002-7820
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English

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