Li-Ion Dynamics in Solid-State Electrolyte by NMR

Understanding ion mobility is critical for the development of safer, higher-performance solid-state batteries. This application note demonstrates how High Gradient Diffusion NMR can be used to directly measure lithium-ion diffusion in solid-state electrolytes such as Li₆PS₅Cl argyrodite. By providing a direct measure of ion mobility and its relationship to ionic conductivity, Diffusion NMR helps researchers evaluate electrolyte materials and optimize their performance during battery development.

Why This Matters

The performance of solid-state batteries depends heavily on ion mobility within the electrolyte. Factors such as charge/discharge rate, energy density, and electrical conductivity are directly influenced by lithium-ion diffusion. Conventional conductivity measurements can be affected by sample preparation and cell assembly, whereas NMR enables non-destructive characterization of loose electrolyte powders before a battery cell is built, helping accelerate material development and electrolyte optimization.

Key Benefits

• Direct Measurement of Ion Mobility. Determine lithium-ion self-diffusion coefficients and relate them directly to ionic conductivity using the Nernst-Einstein relationship.
• Non-Destructive Electrolyte Characterization. Analyze electrolyte powders without pelletizing materials or assembling complete battery cells, reducing potential measurement artefacts.
• Temperature-Dependent Diffusion Analysis. Measure diffusion behavior from 25 °C to 180 °C and determine activation energies governing ion transport.
• Insight into Diffusion Restrictions. Investigate the influence of particle boundaries and restricted diffusion through variable diffusion observation times.
• Support Targeted Electrolyte Optimization. Use diffusion and conductivity data to better understand electrolyte contributions to overall battery performance.

Takeaway

This application note demonstrates how High Gradient Diffusion NMR provides direct insight into lithium-ion mobility in solid-state electrolytes. The technique enables accurate diffusion measurements, determination of activation energies, assessment of ionic conductivity, and investigation of restricted diffusion effects. By characterizing electrolyte materials before cell assembly, researchers can optimize solid electrolytes in a more targeted and efficient manner.

Download the Application Note

Explore how High Gradient Diffusion NMR reveals lithium-ion mobility and ionic conductivity in solid-state electrolytes.