Quantification of the Local Topological Variations of Stripped and Plated Lithium Metal by X-ray Tomography

• DOI: 10.1021/acsami.0c10860
• Publication Date: 2020-08-17T21:19:43Z
• Authors: Lucile Magnier; Didier Devaux; Joël Lachambre; Margaud Lecuyer; Marc Deschamps; Renaud Bouchet; Eric Maire
• Keywords: Dendrite (mathematics); Stripping (fiber); Plating (geology); Characterization

Lithium (Li) metal is the most promising negative electrode to be implemented in batteries for stationary and electric vehicle applications. For years, its use subsequent industrialization were hampered because of inhomogeneous Li+ ion reduction upon recharge onto Li leading dendrite growth. The solid polymer electrolyte a solution mitigate leads typically dense deposits, but stripping plating process remain nonuniform with local current heterogeneities. A precise characterization behavior these heterogeneities during cycling then essential move toward an optimized electrode. In this work, we have developed method based on X-ray tomography applied model symmetric cells quantify spatially probe stripping/plating processes. Ante- post-mortem are recut smaller allow 1 μm voxel size resolution conventional laboratory scanner. reconstructed cell volume postprocessed numerically reflatten electrodes, allowing us measurement thicknesses revealing interface modifications. This in-depth analysis brings information about location their impact microstructure at both grains grain boundaries. We show that (reduction) induces more pronounced compared (oxidation) one. existence crosstalking between electrodes also highlighted. addition, simple methodology permits finely retrieve surface map density thickness change redox process.