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Communication Dans Un Congrès Année : 2022

Study of transport mechanisms of lithium in hybrid electrolytes for solid-state batteries

Résumé

The next generation of lithium-ion batteries needs to have better electrochemical performances and to be intrinsically safer. The replacement of liquid electrolytes by solid-state electrolytes can lead to higher specific or volumetric energy density, and to obtain more thermally stable batteries. Hybrid solid-state electrolytes, i.e. a dispersion of ceramic particles in a polymer matrix, could be a solution. The goal is to combine advantages of different materials: the easy implementation from conducting polymer that also offer good interfaces with the electrodes and the high ionic conductivity of ceramics. This study aims at estimating lithium diffusion coefficients in these hybrid materials by providing information about lithium diffusion paths. It will lead to a better understanding of lithium transport phenomena in the bulk and at interfaces. Methodologies based on characterisations of lithium isotopes (7Li, 6Li) are developed. 6Li-rich materials are used to label the lithium ions of a specific material to be able to differentiate these lithium ions from others. Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS) and 6/7Li solid-state Nuclear Magnetic Resonance spectroscopy (ssNMR) can distinguish between isotopes. That is why they are used to track the diffusion of lithium ions. ToF-SIMS and ssNMR analyses are complementary. On one hand, ToF-SIMS is a surface analysis, which gives local micrometric information on the molecular fragments, and a ratio of the lithium isotopes can be calculated. On the other hand, ssNMR analyses provide global information on lithium ions environment and quantitative experiments can lead to calculate isotopes concentrations.
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Dates et versions

cea-04248416 , version 1 (18-10-2023)

Identifiants

  • HAL Id : cea-04248416 , version 1

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Thomas Meyer, Thibaut Gutel, Michel Bardet, Hervé Manzanarez, Eric de Vito. Study of transport mechanisms of lithium in hybrid electrolytes for solid-state batteries. ECASIA 2022 - European Conference on Application of Surface and Interface Analysis, May 2022, Limerick, Ireland. ⟨cea-04248416⟩
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