Overcoming low initial coulombic efficiencies of Si anodes through prelithiation in all-solid-state batteries

Abstract All-solid-state batteries using Si as the anode have shown promising performance without continual solid-electrolyte interface (SEI) growth. However, the first cycle irreversible capacity loss yields low initial Coulombic efficiency (ICE) of Si, limiting the energy density. To address this, we adopt a prelithiation strategy to increase ICE and conductivity of all-solid-state Si cells. A significant increase in ICE is observed for Li 1 Si anode paired with a lithium cobalt oxide (LCO) cathode. Additionally, a comparison with lithium nickel manganese cobalt oxide (NCM) reveals that performance improvements with Si prelithiation is only applicable for full cells dominated by high anode irreversibility.…

• NS
  National Science Foundation

  Awards: DMR-2308708, 2308708, ECCS-2025752, 2025752, 1650114, DGE 1650114
• UO
  University of California, Santa Barbara

  Awards: 1650114, DMR-2308708
• UO
  University of California, San Diego

  Award: ECCS-2025752
• MR
  Materials Research Science and Engineering Center, Harvard University

  Awards: DMR-2308708, 1650114
• DO
  Division of Materials Research

  Awards: 2308708, DMR-2308708
• DO
  Division of Electrical, Communications and Cyber Systems

  Awards: 2025752, ECCS-2025752