Solid-State Battery
A solid-state battery uses a solid ion-conducting electrolyte between its electrodes instead of the conventional liquid electrolyte. An all-solid-state battery is intended to conduct ions through solid materials throughout the cell; it should not be treated as the same thing as a semi-solid or gel-electrolyte design.
Why it matters
Solid-state describes the electrolyte architecture, not the electrode chemistry. A cell may still use familiar cathode materials and can pair the solid electrolyte with lithium metal, graphite, silicon, or another anode. A solid electrolyte does not by itself make a battery lithium-metal or guarantee its energy density, charging performance, service life, or safety.
Potential benefits include reducing flammable liquid, enabling different packaging, and supporting electrode combinations that can increase energy density. The challenges include maintaining low-resistance contact between solid layers, managing expansion and cracks, controlling dendrites, applying suitable pressure, and manufacturing thin, defect-free electrolyte layers at scale.
For detailed electrolyte types and cell interactions, see Cell Chemistry & Components. For current prototypes and vehicle-validation programmes, see Latest in Battery Technology.