Structural Properties of Manganese Hexacyanoferrates against Li Concentration

Manganese hexacyanoferrate, La x Mn[Fe(CN) 6 ] y $z$H 2 O, is a promising candidate for cathode materials for lithium ion secondary batteries, because the compound exhibits an ideal two-electron reaction without structural phase transition at $y =0.83$. We found that its capacity ($Q$) increases wit...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2013-01, Vol.52 (1), p.017301-017301-6
Main Authors: Kurihara, Yutaro, Matsuda, Tomoyuki, Moritomo, Yutaka
Format: Article
Language:English
Subjects:
Instability
Iron
Lithium
Manganese
Phase separation
Phase transformations
Stability
Storage batteries
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Summary:Manganese hexacyanoferrate, La x Mn[Fe(CN) 6 ] y $z$H 2 O, is a promising candidate for cathode materials for lithium ion secondary batteries, because the compound exhibits an ideal two-electron reaction without structural phase transition at $y =0.83$. We found that its capacity ($Q$) increases with Fe concentration ($y$) from $Q = 115$ mAh/g at $y = 0.83$ to 130 mAh/g at 0.87, and 143 mAh/g at 0.93. We further investigated the structural properties of La x Mn[Fe(CN) 6 ] y $z$H 2 O against the Li concentration ($x$). In the low-$x$ region, the $y = 0.87$ compound exhibits a phase separation into the two cubic phases, whereas the $y = 0.93$ compound separates into the cubic and tetragonal phases. We ascribed these phase separations to the Jahn--Teller (JT) instability as well as the smaller ionic radius of Mn 3+ .
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.52.017301