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Related Experiment Video

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Lithium ionic jump motion in the fast solid ion conductor Li(5)La(3)Nb(2)O(12).

Barbara Koch¹, Michael Vogel

¹Institut fur Physikaleische Chemie, Westfalische Wilhelms-Universitat Munster, Munster, Germany.

Solid State Nuclear Magnetic Resonance

|April 15, 2008

Summary

Investigating lithium ionic motion in garnet Li(5)La(3)Nb(2)O(12) using NMR, this study reveals two distinct lithium species. Annealing temperature influences species mobility, impacting ionic conductivity in these materials.

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Area of Science:

Solid-state chemistry
Materials science
Nuclear magnetic resonance spectroscopy

Background:

Garnet-type materials are promising solid electrolytes for lithium-ion batteries.
Understanding lithium ion dynamics is crucial for optimizing ionic conductivity.
Previous studies suggest complex lithium ion behavior in these structures.

Purpose of the Study:

To investigate the lithium ionic jump motion in Li(5)La(3)Nb(2)O(12) using advanced NMR techniques.
To compare the dynamics of lithium ions in samples annealed at different temperatures (850°C and 900°C).
To elucidate the factors influencing lithium mobility and ionic conductivity.

Main Methods:

Utilized (7)Li Nuclear Magnetic Resonance (NMR) line-shape analysis.
Performed spin-lattice relaxation measurements.
Employed stimulated-echo spectroscopy for detailed analysis of ionic jumps.

Main Results:

Identified two lithium species with distinct dynamical behaviors in both annealed samples.
Observed a shift in majority species from less mobile (GR-850) to more mobile (GR-900) with increasing annealing temperature.
Determined activation energies of 56 kJ/mol for GR-850 and 32 kJ/mol for GR-900.
Correlation functions deviated significantly from simple exponential behavior, indicating complex ionic motion.

Conclusions:

Lithium ionic motion in Li(5)La(3)Nb(2)O(12) is complex and influenced by annealing conditions.
The coexistence of multiple lithium species affects overall ionic conductivity.
NMR spectroscopy provides valuable insights into the intricate dynamics of ions in solid electrolytes.