Impact of lithium composition on the thermoelectric properties of the layered cobalt oxide system LixCoO2

Details Impact of lithium composition on the thermoelectric properties of the layered cobalt oxide system LixCoO2 Impact of lithium composition on the thermoelectric properties of the layered cobalt oxide system LixCoO2

2011-04-13

arxiv.org/abs/1104.2419v2

Phys. Rev. B 83, 195128 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

29 pages, 1 table, 8 figures

Scientific paper

10.1103/PhysRevB.83.195128

Thermoelectric properties of the layered cobalt oxide system LixCoO2 were investigated in a wide range of Li composition, 0.98 >= x >= 0.35. Single-phase bulk samples of LixCoO2 were successfully obtained through electrochemical deintercalation of Li from the pristine LiCoO2 phase. While LixCoO2 with x >= 0.94 is semiconductive, the highly Li-deficient phase (0.75 >= x >= 0.35) exhibits metallic conductivity. The magnitude of Seebeck coefficient at 293 K (S293K) significantly depends on the Li content (x). The S293K value is as large as +70 ~ +100 uV/K for x >= 0.94, and it rapidly decreases from +90 uV/K to +10 uV/K as x is lowered within a Li composition range of 0.75 >= x >= 0.50. This behavior is in sharp contrast to the results of x <= 0.40 for which the S293K value is small and independent of x (+10 uV/K), indicating that a discontinuous change in the thermoelectric characteristics takes place at x = 0.40 ~ 0.50. The unusually large Seebeck coefficient and metallic conductivity are found to coexist in a narrow range of Li composition at about x = 0.75. The coexistence, which leads to an enhanced thermoelectric power factor, may be attributed to unusual electronic structure of the two-dimensional CoO2 block.

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