Chemo-mechanical failure mechanisms of the silicon anode in solid-state batteries

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/Li 6 PS 5 Cl 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|Li 6 PS 5 Cl interface causes severe resistance increase in composite anodes, explaining their fast…

• JL
  Justus Liebig Universität Gießen
• CC
  Compute Canada
• DF
  Deutsche Forschungsgemeinschaft

  Awards: 162/544-1, 03XP0430A, INST 162/544-1 FUGG
• BF
  Bundesministerium für Bildung und Forschung

  Awards: 03XP0430A, 03XP0433D, 03XP0430A, 03XP0433D
• CN
  Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada
• UO
  University of Toronto
• NS
  Natural Sciences and Engineering Research Council of Canada
• NE
  National Eye Institute