Using Combined Time-Resolved XRD and Mass Spectroscopy to Study the Thermal Decomposition of Charged Cathode Materials during Heating

Title
Using Combined Time-Resolved XRD and Mass Spectroscopy to Study the Thermal Decomposition of Charged Cathode Materials during Heating
Authors
박성민Kyung-Wan NamX.-Q. Yu정경윤김광범Xiao-Qing Yang
Keywords
Ni-rich cathode; Time-Resolved XRD; Mass Spectroscopy
Issue Date
2011-10
Publisher
220th ECS meeting
Abstract
The research and development of hybrid electric vehicle (HEV), plug-in hybrid electric vehicle (PHEV) and electrical vehicle (EV) are intensified due to the energy crisis and environmental concerns. Having the highest energy density among all rechargeable batteries, lithium-ion battery is considered as the best candidate of rechargeable batteries for transportation applications. In order to meet the challenging requirements of powering HEV and PHEV, the safety characteristics of lithium battery need to be thoroughly studied and significantly improved. For such studies, the thermal stability is the key issue, especially for using the Ni-based layered cathode materials, which have a merit of high capacity. It was reported that at highly delithiated (i.e., charged) states, the reduction of Ni4+ during heating releases oxygen that can accelerate severe thermal runaway by reacting with the electrolyte and leads to catastrophic failure of the battery. The thermal runaway has been ascribed to the reactions between the charged electrodes and the electrolyte. Therefore, in-depth understanding of the structural changes of the charged cathode material during thermal decomposition, with or without the presence of electrolytes and their relationship to the thermal stability of the cathode material is very important.
URI
http://pubs.kist.re.kr/handle/201004/40510
Appears in Collections:
KIST Publication > Conference Paper
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