The Kinetic Effect on Structural Behavior of Mixed Cathode Materials Studied by Time-Resolved X-ray Diffraction Technique

Title
The Kinetic Effect on Structural Behavior of Mixed Cathode Materials Studied by Time-Resolved X-ray Diffraction Technique
Authors
윤원섭남경완장동혁윤정배김현철정경윤최승돈Xiao-Qing Yang
Keywords
mixed cathode; time resolved XRD
Issue Date
2012-08
Publisher
The 63rd Annual Meeting of the International Society of Electrochemistry
Abstract
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..
URI
http://pubs.kist.re.kr/handle/201004/42957
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KIST Publication > Conference Paper
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