NaCrO2-Based Batteries: Effects of Processing
High-energy ball milling has reduced the particle size drastically. However, after subjecting to high-energy ball milling the specific capacity for NaCrO2 degrades significantly. X-ray diffraction reveals that the lattice distortion has taken place during high-energy ball milling, likely forcing some Cr ions into the tetrahedral site and thus blocking the pathway for Na intercalation and de-intercalation. This study shows that a balance between reducing the particle size and maintaining the layered structure is essential to obtain high specific capacity for the NaCrO2 cathode.
- S. Komaba, C. Takei, T. Nakayama, A. Ogata and N. Yabuuchi, “Electrochemical intercalation activity of layered NaCrO2 vs. LiCrO2,” Electrochem. Commun., 12, 355-358 (2010).
- S. Komaba, T. Nakayama, A. Ogata, T. Shimizu, C. Takei, S. Takada, A. Hokura and I. Nakai, “Electrochemically reversible sodium intercalation of layered NaNi0.5Mn0.5O2 and NaCrO2,” ECS Transactions, 16, 42, 43-55 (2009).