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

Delai Ye, Guang Zeng, Kazuhiro Nogita, Kiyoshi Ozawa, Marlies Hankel, Debra J. Searles, Lianzhou Wang

Research output: Contribution to journalArticle

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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.

Original languageEnglish
Pages (from-to)7488-7496
Number of pages9
JournalAdvanced Functional Materials
Volume25
Issue number48
DOIs
Publication statusPublished - Dec 22 2015

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electric batteries
Cathodes
lithium
cathodes
Chemical activation
activation
ions
Lithium-ion batteries
Synchrotrons
X ray diffraction analysis
Transition metals
charging
synchrotrons
flux density
transition metals
Doping (additives)
Transmission electron microscopy
Detectors
transmission electron microscopy
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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.; Wang, Lianzhou.

In: Advanced Functional Materials, Vol. 25, No. 48, 22.12.2015, p. 7488-7496.

Research output: Contribution to journalArticle

Ye, D, Zeng, G, Nogita, K, Ozawa, K, Hankel, M, Searles, DJ & Wang, L 2015, 'Understanding the Origin of Li2MnO3 Activation in Li-Rich Cathode Materials for Lithium-Ion Batteries', Advanced Functional Materials, vol. 25, no. 48, pp. 7488-7496. https://doi.org/10.1002/adfm.201503276
Ye, Delai ; Zeng, Guang ; Nogita, Kazuhiro ; Ozawa, Kiyoshi ; Hankel, Marlies ; Searles, Debra J. ; Wang, Lianzhou. / Understanding the Origin of Li2MnO3 Activation in Li-Rich Cathode Materials for Lithium-Ion Batteries. In: Advanced Functional Materials. 2015 ; Vol. 25, No. 48. pp. 7488-7496.
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