Beyond Imperfect Match: Silicon/Graphite Hybrid Anodes for High‐Energy–Density Lithium‐Ion Batteries

ABSTRACT Silicon/graphite (Si/Gr) anodes, integrating Si's ultrahigh specific capacity with Gr's structural stability and electrical conductivity, have emerged as the most promising high‐capacity systems for next‐generation lithium‐ion batteries (LIBs). The synergy between Si and Gr enables a balance between energy density, cycling stability, and manufacturability, already demonstrated in commercial cells. However, Si undergoes a large volume expansion of up to 300% during lithiation/delithiation, causing particle fracture, pulverization, electrode collapse, and unstable solid–electrolyte interface formation, which accelerates capacity fading. Although Gr can alleviate stress and maintain conductivity,…

• GD
  Generalitat de Catalunya

  Award: 2021SGR01581