The Kinetic Effect on Structural Behavior of Mixed Cathode Materials Studied by Time-Resolved X-ray Diffraction Technique
- The Kinetic Effect on Structural Behavior of Mixed Cathode Materials Studied by Time-Resolved X-ray Diffraction Technique
- 윤원섭; 남경완; 장동혁; 윤정배; 김현철; 정경윤; 최승돈; Xiao-Qing Yang
- mixed cathode; time resolved XRD
- Issue Date
- The 63rd Annual Meeting
of the International Society
- How the structural changes of each active material in mixed cathode systems take
place at different charge-discharge cycling rates is quite important in the application of
these systems, especially on the system that mixed active materials with different rate
capabilities into one composite electrode. Here we report the results of the real time
structural change studies of mixed LiMn2O4-LiNi1/3Co1/3Mn1/3O2 composite cathode by
using in situ synchrotron-based time resolved x-ray diffraction (TR-XRD) technique.
The TR-XRD experiments tracked the real time structural changes of each
component in mixed cathode system at different discharge rate successfully. The XRD
results of spinel component show interesting phase separation at 4C discharge rate due
to Li diffusion kinetics inside the spinel particle. On the other hand, the structural
change behaviors of layered component are quite similar at C/2 and 4C discharge rates.
The unit cell volume changes of the each component directly reflect its capacity
contribution in the full cell. The layered structure component in the mixed composite
cathode system shows less utilization at fast discharge rate of 4C (high power mode)
whereas the spinel structure component is fully utilized at this rate showing the layered
component is responsible for the reduced capacity at fast discharge rate. From the TRXRD
results of this study, it is concluded that the real time monitoring of the structural
behavior at various current rates help optimize the ratios of active materials with
different rate capabilities in the mixed cathode systems for different applications so as
to realize better performance and cycle life..
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