Revealingthe Structural Evolution and Phase Transformation of O3-Type NaNi 1/3 Fe 1/3 Mn 1/3 O 2 Cathode Materialon Sintering and Cycling Processes
2020
O-type
layered oxide cathode materials can be easily synthesized for a full
sodium stoichiometry with high specific capacity, but they all suffer
from a capacity fade on cycling. The sintering process control and
optimization are critical to ensure a high quality and consistency
of the prepared cathode materials with stable structure. Herein, in situ high-energy X-ray diffraction (HEXRD) was first
employed to investigate the phase evolution of the oxides during the
sintering process of O3-type NaNi1/3Fe1/3Mn1/3O2. The in situ HEXRD and both operando Bragg coherent diffraction (BCXD) and coherent
multicrystal diffraction (CMCD) were utilized to investigate the phase
transformation of the cathode materials during the sodiation/desodiation
process. A composite structure comprised of O-type and P-type oxides
was formed after the initial electrochemical activation of the cathode
material, resulting in good structural and electrochemical stability.
This finding implies that strain engineering can be a new design philosophy
for the development of next generation high-performance sodium ion
cathodes.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
32
References
2
Citations
NaN
KQI