Intrinsic Structure of Sodium Battery Interfaces via CryoEM

Join us for a webinar featuring Kevin Matthews from Texas University and Seth Villarreal from Leica Microsystems as they delve into the intrinsic structure of sodium battery interfaces using advanced cryoEM techniques. Sodium metal anodes with liquid electrolytes present a viable option for cost-effective large-scale energy storage. However, understanding the degradation mechanisms has been challenging due to the difficulty in accessing the buried interfaces without deconstructing the cell.

By employing cryogenic focused ion beam (cryoFIB) milling and cryogenic electron microscopy (cryoEM), we can observe and characterize the entire intact cell, revealing the intrinsic structure and composition of these interfaces. This webinar will explore the morphology of plated sodium and the solid-electrolyte interphase (SEI), providing insights into the degradation mechanisms. A novel degradation method involving the infiltration of separator pores, rather than traditional dendritic piercing, will be discussed. Additionally, the impact of electrolyte solvents on degradation methods will be examined. A comprehensive cryogenic workflow for studying intact coin cells from the microscale to the atomic scale will also be introduced.

Key Learnings

• Cryogenic Focused Ion Beam Milling: Techniques for milling multi-material interfaces.
• Battery Cell Structure Analysis: Insights into the structure of plated sodium and the solid-electrolyte interphase.
• Electrolyte Solvent Effects: Understanding how different solvents impact degradation methods.
• Novel Degradation Method: Exploring a degradation mechanism involving the infiltration of separator pores.

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