What is the theoretical specific capacity of LiCoO₂?
273.85 mAh g-1
This is the maximum capacity when one Li can be removed.
In practice, how much Li is typically removed from LiCoO₂ due to safety/stability issues?
0.5 Li
This results in a practical capacity of 140 Ah kg-1.
What determines the capacity of an electrode material?
- Amount of Li that can be reversibly intercalated/deintercalated
- Weight of the material
These factors are crucial for calculating the capacity.
What is the theoretical specific capacity of LiNiO₂ (LNO)?
275 mAh/g
LNO has the same crystal structure as LiCoO₂.
What is a major issue with pure LiNiO₂?
- Li-Ni disorder
- Thermally unstable
Ni ions can substitute Li sites, blocking Li diffusion pathways.
Why is LiMnO₂ considered a better option compared to Co or Ni?
- Cheaper
- Less toxic
These factors make LiMnO₂ more favorable for use.
What structural change occurs in LiMnO₂ during Li ion extraction?
Layered structure changes into spinel structure
This can lead to Mn dissolution during cycling.
What is the discharge capacity of NCM 424?
155 Ah/kg @ 0.10
NCM 424 is a layered compound with specific discharge characteristics.
What is the capacity of the state-of-the-art NCM compound mentioned?
154 Ah/kg @ 0
This capacity is indicative of the performance of advanced NCM materials.
