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Published on: September 2, 2016
Li diffusion in LixCoO2 probed by muon-spin spectroscopy.
Jun Sugiyama1, Kazuhiko Mukai, Yutaka Ikedo
1Toyota Central Research and Development Laboratories Inc., Nagakute, Aichi 480-1192 Japan. e0589@mosk.tytlabs.co.jp
Muon-spin relaxation (mu+SR) revealed lithium-ion diffusion in LixCoO2 above 150 K. This technique accurately measures lithium diffusion coefficients in magnetic battery materials.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Physics
Background:
- Lithium-ion diffusion is crucial for battery performance.
- Understanding Li+ ion mobility in materials like LixCoO2 is essential for developing advanced energy storage solutions.
Purpose of the Study:
- To investigate the diffusion coefficient of Li+ ions (D(Li)) in LixCoO2.
- To assess the suitability of muon-spin relaxation (mu+SR) as a technique for measuring D(Li) in magnetic materials.
Main Methods:
- Muon-spin relaxation (mu+SR) experiments were conducted in zero and weak longitudinal fields up to 400 K.
- The fluctuation rate (nu) of fields on muons was determined.
- Susceptibility data and electrostatic potential calculations were utilized.
Main Results:
- Clear Li+ ion diffusion was detected in LixCoO2 at temperatures above approximately 150 K.
- The D(Li) estimated from the fluctuation rate (nu) showed excellent agreement with first-principles calculations.
- The mu+SR technique proved effective in detecting D(Li) in materials with magnetic ions.
Conclusions:
- Muon-spin relaxation is an optimal probe for detecting Li+ ion diffusion in LixCoO2 and similar magnetic battery materials.
- The study provides valuable insights into Li+ ion dynamics and validates computational predictions.
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