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Title: Low temperature synthesis, structural characterization, and zero-field resistivity of nanocrystalline La1-xSrxMnO3+δ (0.0≤x≤0.3) manganites

We investigated the thermal conversion of chemically delithiated layered Li0.5Ni1-yMnyO2 (0.2 <= y <= 0.5) into spinel-like LiNi2-yMnyO4 (0.4 <= y <= 1), systematically. The formed spinel-like phases are metastable and cannot be accessed by a conventional high-temperature solid-state method. The layered-to-spinel transformation mechanism has been studied by the Rietveld refinement of in situ neutron diffraction as a function of temperature (25-300 degrees C). The ionic diffusion of Li and M ions is quantified at different temperatures. Electrochemistry of the metastable spinel-like phases obtained has been studied in lithium-ion cells. Moreover, a bond valence sum map has been performed to understand the ionic diffusion of lithium ions in the Ni-rich layered, spinel, and rock-salt structures. Our study can aid the understanding of the possible phases that could be formed during the cycling of Ni-rich layered oxide cathodes.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [1]
  1. Bangalore Univ. (India)
  2. Indian Inst. of Science, Bangalore (India)
Publication Date:
OSTI Identifier:
1261485
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 41; Journal Issue: 9; Journal ID: ISSN 0025-5408
Publisher:
Elsevier
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source
Sponsoring Org:
USDOE; DST
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE A. magnetic materials; A. oxides; B. chemical synthesis; C. x-ray diffraction; D. electrical properties