Table 1.
Comparison of dilute and concentrated electrolyte systems
| Physicochemical Property | Dilute Electrolyte | Concentrated Electrolyte |
|---|---|---|
| Representative components in the bulk electrolyte | Solvent‐separated ion pairs (SSIP) and free solvent molecules | Contact ion pairs (CIPs) and cation‐anion aggregates (AGGs) |
| Representative components of the SEI | A combination of inorganic salts decomposed from the solute and organic species derived from solvents | Dominated by inorganic species from decomposed anions, or from partially precipitated solutes |
| Flammability | High | Low |
| Thermal Stability | Poor | Good |
| Reductive Stability | Low | High |
| Oxidative Stability | Low | High |
| Viscosity | Low | High |
| Ionic Conductivity | 10–2 S cm–1 | 10–3–10–2 S cm–1 |
| Wettability | Good | Relatively poor |
| Electrode reaction kinetics | Slow | Fast |
| Power density | High | May exceed conventional LiPF6/EC‐based electrolyte at certain circumstances |
| Energy density | High | High |
| Cost | Low | High |