Studies on Formation and Decomposition of the Layered Cobaltite LixNayCoO2 | Zendy

A. S. Semenova | Zendy; Р. Ф. Самигуллина | Zendy; E. V. Shalaeva | Zendy; Н. И. Коуров | Zendy; Д. Г. Келлерман | Zendy

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Studies on Formation and Decomposition of the Layered Cobaltite LixNayCoO2

Author(s) -

A. S. Semenova,

Р. Ф. Самигуллина,

E. V. Shalaeva,

Н. И. Коуров,

Д. Г. Келлерман

Publication year - 2011

Publication title -

international journal of inorganic chemistry

Language(s) - English

Resource type - Journals

eISSN - 2090-2026

pISSN - 2090-2034

DOI - 10.1155/2011/649183

Subject(s) - cobaltite , materials science , phase (matter) , chemistry , metallurgy , organic chemistry

Lithium-sodium cobaltite LixNayCoO2 (x≈y≈0.5) with ordered layered structure is promising thermoelectric material. Here we report the peculiarities of this phase formation and decomposition processes studied by TG/DTA, XRD, SEM, and TEM methods. Significant weight loss resulting from oxygen liberation and endothermic effect at T≈1000°C are the main features of the LixNayCoO2 formation. Decomposition of the ordered phase is accompanied by exothermic effect at ≈940°Cand the weight increase. Electron microscopic study shows that the lithium-sodium cobaltite decomposes into LiCoO2 and γ-Na0.7CoO2. Lattices of the initial phase and formed ones demonstrate mutual orientation

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