Synthesis and investigations on an O4-LiCoO<sub>2</sub> polytype
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en
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Ce document a été publié dans
Electrochemical and Solid-State Letters. 2009, vol. 12, n° 11, p. A207-A210
Electrochemical Society
Résumé en anglais
A polytype of LiCoO<sub>2</sub> has been synthesized through an ion-exchange reaction. By exchanging Na<sup>+</sup> for Li<sup>+</sup> ions from an OP4-(Li/Na)CoO<sub>2</sub>-mixed cobaltite, a LiCoO<sub>2</sub> stacking ...Lire la suite >
A polytype of LiCoO<sub>2</sub> has been synthesized through an ion-exchange reaction. By exchanging Na<sup>+</sup> for Li<sup>+</sup> ions from an OP4-(Li/Na)CoO<sub>2</sub>-mixed cobaltite, a LiCoO<sub>2</sub> stacking is obtained. It alternatively combines O2- and O3-LiCoO<sub>2</sub> polytypes and corresponds to an O4 stacking. The phase crystallizes in the hexagonal system with cell parameters a<sub>hex</sub> = 2.802(1) Å and c<sub>hex</sub> = 18.89(2) Å. As the O2 phase, the O4-LiCoO<sub>2</sub>, is metastable; it transforms into the thermodynamically stable O3-LiCoO<sub>2</sub>at around 350–400°C. The crystallographic data, the thermal properties, and the electrochemical behavior of this phase are presented.< Réduire
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