Transport properties of NaxCoO2−y

Development of Reliable Lithium Microreference Electrodes for Long-Term In Situ Studies of Lithium-Based Battery Systems

“…Some researchers 22,23 also reported similar EIS measurements for LiCoO 2 at different SOC. Moreover, Molenda et al 24 declaimed that the fully intercalated LiCoO 2 has lower electrical conductivity. Studies to unravel the detailed in situ processes inside batteries are in progress.…”

A common behaviour of thermoelectric layered cobaltites: incommensurate spin density wave states in [Ca2Co4/3Cu2/3O4]0.62[CoO2] and [Ca2CoO3]0.62[CoO2]

“…At present, the following three groups of cobaltites are known to be good thermoelectrics, because they display metallic conductivities as well as high thermoelectric powers S, for reasons which are currently not fully understood. A sodium cobaltite, Na x CoO 2 , was the first compound reported as a good thermoelectric material [1,2,3] [7,8,9], followed [14], where RS denotes a rocksalt-type block. All share a common structural component, the CoO 2 planes, in which a two-dimensional-triangular lattice of Co ions is formed by a network of edgesharing CoO 6 octahedra.…”

Electron correlation in the two-dimensional triangle lattice ofNaxCoO2

“…Layered cobaltites with a two-dimensional-triangular lattice (2DTL) of Co ions have been intensely investigated because of their structural variety, promising thermoelectric performance, [1,2,3,4,5,6,7,8] and unpredictable superconducting behavior induced by an intercalation of H 2 O. [9,10,11] Among them, the sodium cobaltite Na x CoO 2 is apparently the most basic compound, because of its simple structure, the single CoO 2 planes and the single disordered Na planes form alternating stacks along the c axis.…”