Understanding the Origin of Li2MnO3 Activation in Li-Rich Cathode Materials for Lithium-Ion Batteries

Ye, Delai, Zeng, Guang, Nogita, Kazuhiro, Ozawa, Kiyoshi, Hankel, Marlies, Searles, Debra J and Wang, Lianzhou (2015) Understanding the Origin of Li2MnO3 Activation in Li-Rich Cathode Materials for Lithium-Ion Batteries. ADVANCED FUNCTIONAL MATERIALS  , 25 48: 7488-7496. doi:10.1002/adfm.201503276


Author Ye, Delai
Zeng, Guang
Nogita, Kazuhiro
Ozawa, Kiyoshi
Hankel, Marlies
Searles, Debra J
Wang, Lianzhou
Title Understanding the Origin of Li2MnO3 Activation in Li-Rich Cathode Materials for Lithium-Ion Batteries
Journal name ADVANCED FUNCTIONAL MATERIALS     Check publisher's open access policy
ISSN 1616-301X
1616-3028
Publication date 2015-12-22
Year available 2015
Sub-type Article (original research)
DOI 10.1002/adfm.201503276
Open Access Status Not yet assessed
Volume 25
Issue 48
Start page 7488
End page 7496
Total pages 9
Place of publication Weinheim, Germany
Publisher Wiley
Collection year 2016
Language eng
Formatted abstract
Li-rich layered cathode materials have been considered as a family of promising high-energy density cathode materials for next generation lithium-ion batteries (LIBs). However, although activation of the Li2MnO3 phase is known to play an essential role in providing superior capacity, the mechanism of activation of the Li2MnO3 phase in Li-rich cathode materials is still not fully understood. In this work, an interesting Li-rich cathode material Li1.87Mn0.94Ni0.19O3 is reported where the Li2MnO3 phase activation process can be effectively controlled due to the relatively low level of Ni doping. Such a unique feature offers the possibility of investigating the detailed activation mechanism by examining the intermediate states and phases of the Li2MnO3 during the controlled activation process. Combining powerful synchrotron in situ X-ray diffraction analysis and observations using advanced scanning transmission electron microscopy equipped with a high angle annular dark field detector, it has been revealed that the subreaction of O2 generation may feature a much faster kinetics than the transition metal diffusion during the Li2MnO3 activation process, indicating that the latter plays a crucial role in determining the Li2MnO3 activation rate and leading to the unusual stepwise capacity increase over charging cycles.
Keyword High energy density batteries
In situ characterization
Li-rich cathode materials
Phase activation
Reaction kinetics
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Fri, 15 Jan 2016, 12:23:31 EST by Mrs Louise Nimwegen on behalf of School of Chemistry & Molecular Biosciences