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Spinel-embedded lithium-rich oxide composites for Li-ion batteries

Spinel-embedded lithium-rich oxides are synthesized and their structural phases are analyzed. The type of spinel LiM0.5Mn1.5O4 (M = Ni, Co, Mn) embedded is varied by controlling the spinel composition and content. Of the various composites fabricated with different spinel phases, the LiCo0.5Mn1.5O4-...

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Bibliographic Details
Published in:Journal of power sources 2017-08, Vol.360, p.453-459
Main Authors: Park, Kwangjin, Yeon, Donghee, Kim, Jung Hwa, Park, Jin-Hwan, Doo, Seokgwang, Choi, Byungjin
Format: Article
Language:English
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Summary:Spinel-embedded lithium-rich oxides are synthesized and their structural phases are analyzed. The type of spinel LiM0.5Mn1.5O4 (M = Ni, Co, Mn) embedded is varied by controlling the spinel composition and content. Of the various composites fabricated with different spinel phases, the LiCo0.5Mn1.5O4-embedded over-lithiated layered oxide (OLO) shows the best electrochemical performance as a cathode because of the absence of a parasitic phase and its high structural stability. The formation energy of the LiCo0.5Mn1.5O4-embedded oxide is determined through first-principles calculations and is found to be lower than that of the pristine oxide as well as other spinel-phase-embedded oxides. It is also observed that use of OLO with optimal embedded spinel LiCo0.5Mn1.5O4 in a cylindrical 18650-type cell results in improvement in the full-cell electrochemical performance. •Spinel-embedded Li-rich oxides are synthesized and their phases are analyzed.•LiCo0.5Mn1.5O4-embedding oxide shows the best electrochemical performance.•This is due to its high structural stability and absence of a parasitic phase.•Formation energies of the synthesized spinel-embedding oxides are calculated.•That of the LiCo0.5Mn1.5O4-embedding oxide is found to be the lowest.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2017.06.034