Journal
SCIENTIFIC REPORTS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep08810
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Funding
- National Nature Science Foundation of China [U1430104, 51372228]
- 973 Program of China [2011CB933300]
- ScienceAMP
- Technology Commission of Shanghai Municipality [08DZ2270500, 11JC 1400500]
- Shanghai Pujiang Program [14PJ1403900]
- U.S. Department of Energy, Office of Vehicle Technologies [DEAC02-98CH10886]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
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The key factors governing the single-phase or multi-phase structural change behaviors during the intercalation/deintercalation of guest ions have not been well studied and understood yet. Through systematic studies of orthorhombic Fe-2(MoO4)(3) electrode, two distinct guest ion occupation paths, namely discrete one for Li and pseudo-continuous one for Na, as well as their relationship with single-phase and two-phase modes for Na+ and Li+, respectively during the intercalation/deintercalation process have been demonstrated. For the first time, the direct atomic-scale observation of biphasic domains (discrete occupation) in partially lithiated Fe-2(MoO4)(3) and the one by one Na occupation (pseudo-continuous occupation) at 8d sites in partially sodiated Fe-2(MoO4)(3) are obtained during the discharge processes of Li/Fe-2(MoO4)(3) and Fe-2(MoO4)(3) cells respectively. Our combined experimental and theoretical studies bring the new insights for the research and development of intercalation compounds as electrode materials for secondary batteries.
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