Effective Ion Doping Methods
1. Cation Ion Doping
- Method: Cation ions can be doped into sites like the phosphorus site in certain solid electrolytes.
- Benefits: Introduces vacancies that enhance ionic conductivity, altering the bond energy and diffusion activation energy of ions.
- Example: Doping with aluminum in LLZO retains structural symmetry and creates vacant spaces for lithium ions.
2. Aliovalent Doping
- Method: This involves substituting ions of different valences.
- Benefits: Achieves high ionic conductivity by modifying ion mobility and vacancy concentration.
- Example: Aliovalent doping in Na3SbS4 enhances sodium ion conductivity to over 10 mS/cm.
3. Multi-Doping Strategy
- Method: Involves doping with multiple elements simultaneously.
- Benefits: Allows for tailored improvement in ionic conductivity and structural properties.
- Example: Doping lithium garnets with combinations like Ta, Ta-Ba, and Ta-Ba-Sc enhances Li-ion conductivity.
4. Isovalent Doping
- Method: Replaces ions with others of the same valence.
- Benefits: Modifies local and global structural effects on ion migration barriers, enhancing mobility.
- Example: Doping with smaller, lighter cations can soften the framework and improve conductivity.
These methods provide flexible approaches to optimizing the performance of solid electrolytes, which are critical for advanced battery technologies like all-solid-state lithium batteries.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/what-are-the-most-effective-ion-doping-methods-for-solid-electrolytes/
