Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 25, Issue 48, Pages 7488-7496Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201503276
Keywords
high energy density batteries; in situ characterization; Li-rich cathode materials; phase activation; reaction kinetics
Categories
Funding
- Chinese Scholarship Council (CSC)
- Grants-in-Aid for Scientific Research [25410256] Funding Source: KAKEN
Ask authors/readers for more resources
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 O-2 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available