Bibliographic Details
| Title: |
Chemo-mechanical failure mechanisms of the silicon anode in solid-state batteries |
| Authors: |
Huo, Hanyu, Jiang, Ming, Bai, Yang, Ahmed, Shamail, Volz, Kerstin, Hartmann, Hannah, Henss, Anja, Singh, Chandra Veer, Raabe, Dierk, Janek, Jürgen |
| Source: |
Nature Materials; 20240101, Issue: Preprints p1-9, 9p |
| Abstract: |
Silicon is a promising anode material due to its high theoretical specific capacity, low lithiation potential and low lithium dendrite risk. Yet, the electrochemical performance of silicon anodes in solid-state batteries is still poor (for example, low actual specific capacity and fast capacity decay), hindering practical applications. Here the chemo-mechanical failure mechanisms of composite Si/Li6PS5Cl and solid-electrolyte-free silicon anodes are revealed by combining structural and chemical characterizations with theoretical simulations. The growth of the solid electrolyte interphase at the Si|Li6PS5Cl interface causes severe resistance increase in composite anodes, explaining their fast capacity decay. Solid-electrolyte-free silicon anodes show sufficient ionic and electronic conductivities, enabling a high specific capacity. However, microscale void formation during delithiation causes larger mechanical stress at the two-dimensional interfaces of these anodes than in composite anodes. Understanding these chemo-mechanical failure mechanisms of different anode architectures and the role of interphase formation helps to provide guidelines for the design of improved electrode materials. |
| Database: |
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